CN102470517A - Hammering tool - Google Patents

Abstract

Disclosed is a method for obtaining a drilling mode with high reliability. As an embodiment of the above, there is disclosed an arrangement wherein a joint ring (34) that rotates integrally with an anvil (9) in a hammer case (6), in such a way that connecting pins (35) protruding rearward are inserted forward through an arm (21), is provided in such a manner as to be capable of moving back and forth between an advanced position where the connecting pins (35) pass only through the arm (21) and a retreat position where the connecting pins (35) pass through the arm (21) and are inserted into blind holes (39) formed in the front surface of a hammer (22), wherein meanwhile an operating ring (41) that is capable of subjecting the joint ring (34) to sliding operation between the advanced position and the retreat position is provided in the hammer case (6), and wherein when the joint ring (34); is moved by the operating ring (41) to the retreat position, then the hammer (22) and the arm (21) are integrated together in the rotational direction via the joint ring (34), thereby preventing the hammer (22) from coming off, thus causing the anvil (9) and a spindle (7) to rotate integrally together.

Description

Percussion tool

Technical field

The present invention relates to make the impact screwdriver percussion tools such as (impact driver) that produces rotary impact power to the outstanding anvil block (anvil) in the place ahead of housing.

Background technology

In percussion tools such as impact screwdriver, have: main shaft is rotated by motor in housing; Hammer is enclosed within outward on this main shaft, and main shaft is connected through the ball that is embedded in the groove that on both, is provided with this hammer, gives prominence to being provided with a pair of pawl at the front surface of this hammer; Anvil block is supported by housing with main shaft coaxially, and the front end of erecting tools head is outstanding to the place ahead of housing, is formed with radial a pair of arm in the rear end; Helical spring, the progressive position that on direction of rotation, engages to pawl and arm is to the hammer application of force.That is, when the moment of torsion of anvil block (torque) is big, through the guiding of the ball that in groove, rolls; Hammer is retreated and is separated with arm; Fasten before rotate and then through helical spring active force again, carry out this action repeatedly, thereby make anvil block intermittently produce rotary impact power (impulsive force) with arm.

In such percussion tool, in the time of for example will in thread Pilot hole, being screwed into screw, use different tools respectively, at first, utilize electric drill to run through and establish thread Pilot hole, then, be screwed into screw through impacting percussion tools such as screwdriver.Thereby, need to prepare and the replacing instrument, and cause operation property poor.If can on the impact screwdriver, drill bit be installed, then can bore a hole, but if more crisp work piece such as ceramic tile then impacts breakage because of producing probably.

Therefore, shown in patent documentation 1, invented the percussion tool that is provided with the hammer limiting unit, wherein, the hammer limiting unit can limit hammer arbitrarily makes hammer and arm always be in fastening state axial moving.According to this percussion tool, realize drill jig formula (drill mode) through the hammer limiting unit, and need not distinguish tool using.

The prior art document

Patent documentation

Patent documentation 1: No. 2828640 communique of Japan Patent

Summary of the invention

The problem that invention will solve

But patent documentation 1 disclosed hammer limiting unit is that the outer surface that makes engagement pin be fastened on the big hammer of quality from the outside of housing comes forcibly to limit the structure of retreating, so engagement pin maybe be damaged, thereby aspect the reliability of drill jig formula existing problems.

Therefore, the object of the present invention is to provide the percussion tool that to realize the drill jig formula with high reliability.

The means that are used to deal with problems

In order to achieve the above object, the invention of technical scheme 1 record is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating; And the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm; Hammer is used for the pawl that fastens with said arm outstanding being provided with of front surface, and is enclosed within outward on the said main shaft; This hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, connecting elements; In said housing, be arranged on the place ahead of said arm, and make rearward outstanding connecting pin connect the next and said anvil block one rotation of said arm, and; Said connecting elements can move forward and backward between progressive position and going-back position, and wherein, said progressive position is meant; Said connecting pin only connects the position of said arm, and said going-back position is meant, said connecting pin connects said arm and is inserted in the position in the blind hole that the front surface of said hammer forms; Control member is arranged on the said housing, can operate said connecting elements and slide into said progressive position and said going-back position; When making said connecting elements move to said going-back position through said control member; Through said connecting elements said hammer and arm are become one on direction of rotation; Engaging/the separating action that stops said hammer is so that said anvil block and the rotation of said integrated spindle axis.

In order to achieve the above object, the invention of technical scheme 4 records is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and it is outstanding to the place ahead of said housing to be used for the front end of erecting tools head; And outstandingly in the rear end being provided with radial arm, hammer is used for the pawl that fastens with said arm outstanding being provided with of front surface, and is enclosed within outward on the said main shaft; This hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, and lock pin is arranged on the said main shaft; And can and not have between the implantation site at extrusion position and haunt, wherein, said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft; To limit the position that said hammer is retreated, said do not have the implantation site to refer to, this lock pin in the said main shaft and position that allows said hammer to retreat of submerging; Application of force unit applies the active force that does not have the implantation site to said, pressing lever to said lock pin; Be arranged on the axle center of said main shaft, and can between going-back position and progressive position, slide, wherein; Said going-back position is meant, pushes said lock pin and makes it to the position that said extrusion position moves, and said progressive position is meant; Releasing makes it to the said position that there is not the implantation site to move to pushing of said lock pin, prolongs the bottom, is arranged on the bottom that being used in the said anvil block install the installing hole of said tool heads; Be projected into this prolongation bottom at the front end of said pressing lever during at said progressive position and make, be pressed into portion, be arranged on the rear end of specific tool heads; Under the installment state in being installed in said installing hole, be connected to the front end of said pressing lever, to be pressed into said pressing lever to said going-back position; When being installed in said specific tool heads in the said installing hole; Through move to the said lock pin of said extrusion position by said pressing lever; Limit said hammer and retreat, stop the engaging/separating action of said hammer, so that said anvil block and the rotation of said integrated spindle axis.

In order to achieve the above object, the invention of technical scheme 7 records is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support, and; The front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and in the rear end outstanding radial arm, the hammer of being provided with; Be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, this hammer engages/separates with said arm according to the moment of torsion of said anvil block; And the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, lock pin is arranged on the said main shaft; And can and not have between the implantation site at extrusion position and haunt, wherein, said extrusion position is meant; Outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft, and to limit the position that said hammer is retreated, said do not have the implantation site to refer to; This lock pin in the said main shaft and position that allows said hammer to retreat of submerging, application of force unit applies the active force that does not have the implantation site to said to said lock pin; Pressing lever is connected with said anvil block, connects the axle center of said main shaft and the position that its rear end arrives said lock pin; Said anvil block can move forward and backward between the primary importance and the second place; Wherein, said primary importance is meant that the position that said lock pin moves it said extrusion position is pushed in the rear end of said pressing lever; The said second place is meant; The rear end of said pressing lever is removed pushing of said lock pin is moved it the said position that there is not the implantation site, and on the other hand, said housing is provided with control member; This control member can be operated said anvil block and slide into the said primary importance and the said second place; When making said anvil block move to said primary importance, limit said hammer through said lock pin and retreat the engaging/separating action that stops said hammer, so that said anvil block and the rotation of said integrated spindle axis through said control member.

In order to achieve the above object, the invention of technical scheme 11 records is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and it is outstanding to the place ahead of said housing to be used for the front end of erecting tools head; And outstandingly in the rear end being provided with radial arm, hammer is used for the pawl that fastens with said arm outstanding being provided with of front surface, and is enclosed within outward on the said main shaft; This hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, lock pin; Be arranged on the said main shaft, and can and do not have between the implantation site at extrusion position and haunt, wherein; Said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm to limit the position that said hammer is retreated this lock pin from said main shaft, and said do not have the implantation site to be meant; This lock pin in the said main shaft and position that allows said hammer to retreat of submerging, application of force unit applies the active force that sinks to the position to said to said lock pin; Pressing lever is arranged on the axle center of said main shaft, and can between the primary importance and the second place, moves forward and backward; Wherein, said primary importance is meant, pushes said lock pin and makes it to position that said extrusion position moves; The said second place is meant, removes making it to the said position that does not have the implantation site to move, connecting elements to pushing of said lock pin; Be connected with said pressing lever, and, in the axial direction through said anvil block and make front end be projected into the place ahead of said anvil block; When operating said connecting elements and make said pressing lever move to said primary importance, limit said hammer through said lock pin and retreat the engaging/separating action that stops said hammer, so that said anvil block and the rotation of said integrated spindle axis.

In order to achieve the above object, the invention of technical scheme 14 records is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating; And the front end that makes the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm; Hammer is used for the pawl that fastens with said arm outstanding being provided with of front surface, and is enclosed within outward on the said main shaft; This hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, lock pin; Be arranged on the said main shaft, and can and do not have between the implantation site at extrusion position and haunt, wherein; Said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm to limit the position that said hammer is retreated this lock pin from said main shaft, and said do not have the implantation site to refer to; This lock pin in the said main shaft and position that allows said hammer to retreat of submerging, application of force unit applies the active force that does not have the implantation site to said to said lock pin; Pressing lever is connected with said anvil block, connects the axle center of said main shaft and the position that its rear end arrives said lock pin; Said main shaft can move forward and backward between the primary importance and the second place; Wherein, said primary importance is meant that the position that said lock pin moves it said extrusion position is pushed in the rear end of said pressing lever; The said second place is meant; The rear end of said pressing lever is removed pushing of said lock pin is moved it the said position that there is not the implantation site, and on the other hand, said housing is provided with control member; This control member can be operated said main shaft and slide into the said primary importance and the second place; When making said main axle moving through said control member, limit said hammer through said lock pin and retreat the engaging/separating action that stops said hammer, so that said anvil block and the rotation of said integrated spindle axis to said primary importance.

In order to achieve the above object, the invention of technical scheme 17 records is a kind of percussion tool, it is characterized in that, comprising: main shaft; In housing, be rotated by motor, anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and; The front end that makes the erecting tools head is outstanding to the place ahead of said housing, and in the rear end outstanding radial arm, the hammer of being provided with; Front surface is outstanding to be provided with and to be used for the pawl that fastens with said arm, and is enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block; And the rotation of said main shaft is converted into rotary impact power is passed to said anvil block, ball is connected said main shaft and hammer through the outer peripheral face that is entrenched in said main shaft with the inner peripheral surface of hammer; And, through rolling being arranged with in the tipper of the outer peripheral face side of said main shaft, thereby said hammer is engaged/separating action; Limiting groove is provided with towards the place ahead at the front end of said tipper continuously, is used to make said ball to break away from said tipper; Support recess, be arranged on the front part of said main shaft, and be connected with the bottom of said limiting groove; Push projection is arranged on the back quadrate part of said anvil block, and with said support recess tabling in and be projected into the bottom of said limiting groove; Said anvil block can move forward and backward between progressive position and going-back position in said support recess; Wherein, said progressive position is meant that the bottom of said push projection and said limiting groove is separated and allows said ball to get into the position of said limiting groove; Said going-back position is meant; Be projected into the bottom of said limiting groove and stop said ball to get into the position of said limiting groove at said push projection, on the other hand, said housing is provided with control member; This control member can be operated said anvil block and slide into said progressive position and said going-back position; When making said anvil block slide into said progressive position, make said ball get into engaging/separating action that said limiting groove stops said hammer, so that said anvil block and the rotation of said integrated spindle axis through said control member.

The effect of invention

According to above-mentioned each invention, not only can use with original conflicting model (impact mode), can also use with the drill jig formula that does not produce impulsive force.Thus, need not distinguish tool using, and make operation property good.

Especially; Invention according to technical scheme 1; The basis that not only has above-mentioned effect, and, owing to the connecting pin that makes the connecting elements that connects arm is integrally formed hammer and anvil block from the place ahead is inserted into the blind hole of hammer; So can under the situation to the big load of connecting pin effect both be connected, thereby improving the reliability of drill jig formula.In addition, in housing, dispose connecting elements, thereby can not make the total length of percussion tool elongated, and can keep miniaturization in the place ahead of arm.And, because control member can be significantly not outstanding from housing, so operability is excellent.

Especially; Invention according to technical scheme 4; The basis that not only has above-mentioned effect, and, limit retreating of hammer owing to make to fasten with hammer with beeline from the side-prominent lock pin of main shaft; So can under the situation to the big load of connecting pin effect both be connected, thereby improving the reliability of drill jig formula.In addition, realize the drill jig formula because pass through the alteration of form of the inside of main shaft and anvil block, thereby can not make the total length of percussion tool elongated, and can keep miniaturization.And, automatically select the drill jig formula through inserting specific tool heads, do not need the operating operation member, thereby have operation property, the better advantage of operability.

Especially; Invention according to technical scheme 7; The basis that not only has above-mentioned effect, and, limit retreating of hammer owing to make to fasten with hammer with beeline from the side-prominent lock pin of main shaft; So can under the situation to the big load of connecting pin effect both be connected, thereby improving the reliability of drill jig formula.In addition because anvil block itself is moved forward and backward, so that pressing lever advance and retreat move is rational in infrastructure and reliable.

Especially; Invention according to technical scheme 11; The basis that not only has above-mentioned effect, and, limit retreating of hammer owing to make to fasten with hammer with beeline from the side-prominent lock pin of main shaft; Thereby can under the situation to the big load of connecting pin effect both connected, thereby improve the reliability of drill jig formula.In addition, because can carry out the operation of switch mode, so easy operating from the place ahead of anvil block.

Especially; Invention according to technical scheme 14; The basis that not only has above-mentioned effect, and, limit retreating of hammer owing to make to fasten with hammer with beeline from the side-prominent lock pin of main shaft; Thereby can under the situation to the big load of connecting pin effect both connected, thereby improve the reliability of drill jig formula.

Especially, according to the invention of technical scheme 17, not only has the basis of above-mentioned effect; And; Because the rolling that is used to connect the ball of main shaft and hammer through prevention limits hammer and retreats, so can reliably stop the engaging/separating action of hammer, the reliability of raising drill jig formula.In addition, because the shape that needs only main shaft and anvil block changes, suppress cost increases so can reduce number of components.

Description of drawings

Fig. 1 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 1.

(A) of Fig. 2 is the stereogram of hammer, (B) is the stereogram of anvil block, (C) is the stereogram of attachment ring (joint ring).

(A) of Fig. 3 is the front view of hammer, (B) is the front view of anvil block, (C) is the side view of attachment ring.

Fig. 4 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 1.

Fig. 5 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 2.

Fig. 6 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 2.

Fig. 7 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 3.

Fig. 8 is the key diagram of anvil block, (A) shows the back side, (B) shows the side of biopsy cavity marker devices.

Fig. 9 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 3.

Figure 10 is the key diagram of hammer shell.

Figure 11 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 4.

Figure 12 is the cross-sectional enlarged drawing of anvil block fore-end.

Figure 13 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 4.

Figure 14 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 5.

Figure 15 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 5.

Figure 16 is the longitudinal section (conflicting model) of a part of the impact screwdriver of mode 6.

Figure 17 is the key diagram of expression ball in the position of the V-shaped valley of main shaft.

Figure 18 is the longitudinal section (drill jig formula) of a part of the impact screwdriver of mode 6.

The specific embodiment

Below, based on description of drawings embodiment of the present invention.In addition, in the later mode of mode 2,, and omit the explanation of repetition to the identical Reference numeral of structural portion mark shared with mode 1.

[mode 1]

As shown in Figure 1, have as the impact screwdriver 1A of an example of percussion tool: body shell 2, it is half housing 3,3 about assembling and form, and is equipped with motor 4; The cross section is the hammer shell 6 that hangs bell shape, and it is the housing of front side, is assembled in the place ahead (right side among Fig. 1) of body shell 2, and ccontaining main shaft 7, beater mechanism 8, anvil block 9.Extension is provided with handle 10 below body shell 2, and the top in handle 10 is equipped with the switch 11 with trigger 12, wherein, the not shown battery pack that becomes power supply is installed in the lower end of handle 10.In addition, on body shell 2, be formed with the extension 13 that covers part below this, the lighting unit 14 towards the place ahead of anvil block 9 is installed in the inside of extension 13 at the lower portion branch of hammer shell 6.

The output shaft 5 of motor 4 is supported on the gear-box 15 that is assembled on the body shell 2, and the chimeric pinion 16 that is projected in the hammer shell 6 that is equipped with.In hammer shell 6, main shaft 7 axle center in the wings has the hollow bulb 17 that pinion 16 can insert, and maintains 18,18, two planetary gears 18,18 of two planetary gears and pinion 16 engagements of revolution in inboard gear 19 in the periphery of main shaft 7.The rearward end of main shaft 7 is supported for output shaft 5 coaxial by ball bearing 20, this ball bearing 20 is supported by gear-box 15.

In addition, like Fig. 2, shown in 3, in hammer shell 6, be provided with radial a pair of arm 21,21 in the extension of the rear end of anvil block 9.Beater mechanism 8 has: hammer 22, be enclosed within the front end of main shaft 7 outward, and front surface is outstanding to be provided with and to be used for a pair of pawl 23,23 that engages with arm 21,21; Helical spring 24 is forwards to hammering 22 application of forces into shape.Hammer 22 is connected with main shaft 7 through ball 27,27; Wherein, Ball 27,27 is embedded in chevron groove 25,25 and the V-shaped valley 26,26; Said chevron groove 25,25 from front end towards the rear be arranged with at hammer 22 inner peripheral surface, and thin more more to the back-end, said V- shaped valley 26,26 make most advanced and sophisticated towards the place ahead be arranged with outer peripheral face at main shaft 7.

On the other hand; The bearing 28 that the pars intermedia of anvil block 9 is maintained at the front end of hammer shell 6 supports; In the dead eye 29 that the back surperficial axle center of anvil block 9 forms, chimeric have at the outstanding minor diameter part 30 that is provided with of the front end of main shaft 7, and anvil block 9 and main shaft 7 be the front end of supports main shaft 7 coaxially.

In addition, be formed with the installing hole 31 of tool heads from the front end of the outstanding anvil block 9 of hammer shell 6, and be provided with that the tool heads that prevents to be inserted in the installing hole 31 comes off and the clamp mechanism of installing, this clamp mechanism has ball 32 and sleeve 33 etc.

And, in hammer shell 6, be provided with attachment ring 34 as connecting elements in the place ahead of the arm 21 of anvil block 9.This attachment ring 34 is placed in the recess 36 of the ring-type that the front surface of hammer in the shell 6 is arranged with, and, these attachment ring 34 overcoats the central authorities that are being positioned at recess 36 and with anvil block 9 coaxially rearward in the tube portion 37 of outstanding setting, and can on fore-and-aft direction, slide.In addition; Like Fig. 2, shown in 3; On the back surface of attachment ring 34, be point-symmetric a pair of connecting pin 35,35 with rearward outstanding being provided with in axially parallel ground, this a pair of connecting pin 35,35 connects a pair of open- work 38,38; Wherein, this a pair of open- work 38,38 and connecting pin 35, the 35 concentric arms 21 that are arranged at anvil block 9 that run through circularly.Thus, attachment ring 34 is connected with anvil block 9, and on direction of rotation, becomes one, and attachment ring 34 can move on fore-and-aft direction individually.

And the front surface of hammer 22 is formed with 4 blind holes 39,39 ..., arm 21,21 be in respectively in the clockwise direction with counter clockwise direction on fasten with pawl 23,23 the position time, these 4 blind holes 39,39 ... Overlap on fore-and-aft direction with open-work 38,38.Thus; The going-back position that connects at the front surface of attachment ring 34 and arm 21; Connecting pin 35,35 connects arm 21,21; And then loose fit ground inserts blind hole 39,39, is separated and is contained in the progressive position in the recess 36 at attachment ring 34 and arm 21,21, and connecting pin 35,35 also connects arm 21,21 and only breaks away from blind hole 39.

And; Be formed with the groove 40 of ring-type at the outer peripheral face of attachment ring 34; On the other hand, be with the operation ring 41 as control member in that the outer surface of hammer shell 6 is can be movably forward and backward outer, the point symmetry position on operation ring 41 inserts groove 40 towards the slotted hole 43 of the outstanding pair of pin that is provided with 42, the 42 perforation fore-and-aft directions of center axis; Wherein, slotted hole 43 run through be arranged on the hammer shell 6 on.

Thus, when making operation ring 41 move to the front end of pin 42 arrival slotted holes 43, as shown in Figure 1, attachment ring 34 also moves to progressive position and makes connecting pin 35,35 break away from the blind hole 39 of hammer 22.On the contrary, when making operation ring 41 move to pin 42 when arriving the going-back position of rear end of slotted holes 43, as shown in Figure 4, attachment ring 34 also moves to going-back position, makes connecting pin 35,35 insert blind holes 39 and hammer 22 is connected with anvil block 9.In addition, hammer shell 6 is provided with not shown ball, when this ball is positioned at front and back position at operation ring 41, is embedded in the not shown open-work that on operation ring 41, is provided with and keeps each position.

In above-mentioned such impact screwdriver 1A that constitutes; As shown in Figure 1; Attachment ring 34 is remained on progressive position making operation ring 41 slide into the place ahead, and removed hammer into shape 22 with the state that is connected (conflicting model) of anvil block 9 under, the trigger 12 of operation setting on handle 10 comes CD-ROM drive motor 4.So the rotation of output shaft 5 reaches main shaft 7 via planetary gear 18,18, make main shaft 7 rotations.Main shaft 7 makes hammer 22 rotations via ball 27,27, and makes anvil block 9 rotation of hammer 22 engagings, thus the tool heads trip bolt of the front end through being installed in anvil block 9 etc.

When the moment of torsion that makes anvil block 9 along with the carrying out of trip bolt becomes big; The rotation of hammer 22 and the rotation generation deviation of main shaft 7; Thereby through ball 27,27 is rolled along V- shaped valley 26,26, hammer 22 with respect to main shaft 7 rotations, is retreated Yi Bian overcome the active force of helical spring 24 on one side.

Then, when hammer 22 pawl 23 breaks away from arms 21, hammer 22 active forces by helical spring 24, and through ball 27,27 is rolled towards the tip of V- shaped valley 26,26, and rotation on one side, Yi Bian advance.Thus, the pawl 23 of hammer 22 fastens with arm 21 once more and produces rotary impact power (impulsive force).Through carrying out repeatedly and the engaging of this anvil block 9/separate to come further and tighten.

On the other hand, when attachment ring 34 being remained on going-back position, as stated, make hammer 22 be connected with anvil block 9 (drill jig formula) through connecting pin 35,35 when making operation ring 41 slide into the rear.Under this state, if operating trigger 12 comes CD-ROM drive motor 4, then hammer 22 into shape and rotate along with the rotation of main shaft 7, rotate integratedly with anvil block 9 thereby hammer 22 into shape.

Then, big even the moment of torsion of anvil block 9 becomes, also because the relative rotation of hammer 22 and anvil block 9 by connecting pin 35 restrictions, can not engage/separating action with respect to arm 21 so hammer 22 into shape.Thus, can not produce impulsive force, anvil block 9 and the rotation of main shaft 7 one.

Like this, according to the impact screwdriver 1A of aforesaid way 1, in hammer shell 6; Be provided with attachment ring 34 in the place ahead of arm 21; This attachment ring 34 make rearward outstanding connecting pin 35 connect arms 21 and can with the rotation of anvil block 9 one, and this attachment ring can move forward and backward between progressive position and going-back position, wherein; Said progressive position is meant; Connecting pin 35 only connects the position of arm 21, and said going-back position is meant, connecting pin 35 connects arms 21 and is inserted in the position in the blind hole 39 that the front surface of hammer 22 forms; On the other hand, hammer shell 6 is provided with and can operates attachment ring 34 and make it slide into the operation ring 41 of progressive position and going-back position; When making attachment ring 34 move to going-back position through operation ring 41; Through attachment ring 34 hammer 22 and arm 21 are become one on direction of rotation and stop the engaging/separating action of hammer 22; Make anvil block 9 and the rotation of main shaft 7 one; Thereby not only can use with original conflicting model, can also use with the drill jig formula that does not produce impulsive force.Thus, need not distinguish tool using, make operation property good.

Especially; At this; Make the connecting pin 35 of the perforation arm 21 of attachment ring 34 from the blind hole 39 of the place ahead insertion hammer 22, hammer 22 and anvil block 9 become one, thereby can under the situation to the big load of connecting pin 35 effects both connected, and the reliability of raising drill jig formula.In addition, in hammer shell 6,,, can keep miniaturization so can not make the total length of impacting screwdriver 1A elongated because dispose attachment ring 34 in the place ahead of arm 21.And, because operation ring 41 can be significantly not outstanding from hammer shell 6 with pin 42, so operability might as well.

In addition, in aforesaid way 1, can increase the quantity of connecting pin, and with regard to the shape of connecting pin itself, except the cross section is the circle, the cross section can also be rectangle, polygon etc.In addition, control member can suitably change, and for example on the operation ring, pin is set integratedly, perhaps adopts tabular brace to replace pin.

[mode 2]

In impact screwdriver 1B shown in Figure 5; Be formed with from the back through hole 44 of hollow bulb 17 in the axle center of main shaft 7 up to the front surface of minor diameter part 30; Be formed with from the preceding through hole 45 of dead eye 29 in the axle center of anvil block 9, in back through hole 44 and preceding through hole 45, be inserted with to loose fit the pressing lever 46 that can move forward and backward up to the conduct prolongation bottom of installing hole 31.Be provided with more the conus portion 47 thin more in the rear end of this pressing lever 46, and this conus portion 47 is projected in the hollow bulb 17 towards the rear.

In addition; The front end loose fit of the hollow bulb 17 of main shaft 7 be inserted with radial a plurality of lock pin (lock pin) 48,48, these a plurality of lock pins 48,48 can be in roughly same having between the implantation site in simultaneously at the outer peripheral face of the outer end extrusion position outstanding from the outer peripheral face of main shaft 7 and outer end and main shaft 7 and not haunt.Be provided with in the inner of each lock pin 48 more towards the thin more roundlet tapering 49 of inboard front end, and the outer distolateral overcoat in roundlet tapering 49 has the helical spring 50 as application of force unit, towards the center axis of main shaft 7 to lock pin 48 application of forces.

The roundlet tapering 49 of each lock pin 48 connects with the conus portion 47 of pressing lever 46, and through the guiding function between the conical surface, the progressive position of bottom surface, front side that is connected to hollow bulb 17 to conus portion 47 is to pressing lever 46 application of forces.Under this state, the front end of pressing lever 46 is positioned at preceding through hole 45, and each lock pin 48 maintains does not have the implantation site.

The 51st, be installed in the drill bit in the installing hole 31, the rear end of drill bit 51 be formed be projected under the state that is being inserted in the installing hole 31 before the portion that is pressed into 52 in the through hole 45.That is, when being installed in drill bit 51 in the installing hole 31, being pressed into portion 52 and rearward being pressed into pressing lever 46, the conus portion 47 of pressing lever 46 is pushed the roundlet tapering 49 of each lock pin 48 thus, and the active force that makes each lock pin 48 overcome helical spring 50 moves to extrusion position.

On the other hand, in hammer 22 rear end, be formed with the engaging recessed part 53 of ring-type week, this engaging recessed part 53 can fasten with the lock pin that is in extrusion position 48 respectively when the progressive position that the arm 21 of hammer 22 and anvil block 9 fastens.

In above-mentioned such impact screwdriver 1B that constitutes; In installing hole 31, installed under the state of the tool heads (not being pressed into the tool heads of portion 52) beyond the drill bit 51; Pressing lever 46 rearward is not pressed into; Thereby as shown in Figure 5, the active force of lock pin 48 through helical spring 50 is in and do not have the implantation site (conflicting model).Thereby hammer 22 can be retreated with lock pin 48 with interfering, thereby when the load that acts on anvil block 9 becomes big, hammers into shape 22 to engage/separating action and produce impulsive force.

On the other hand, as shown in Figure 6, when in installing hole 31, drill bit 51 being installed, as stated, pressing lever 46 is pressed into portion 52 and rearward is pressed into, and lock pin 48 is pressed against extrusion position and engages (drill jig formula) with engaging recessed part 53.Thus, hammer 22 is limited from the retreating of clamped position that engage with arm 21, becomes big even act on the load of anvil block 9, and main shaft 7 is also kept one with anvil block 9 and rotated.

Like this; According to the impact screwdriver 1B of aforesaid way 2, main shaft 7 is provided with and can and the lock pin 48 that does not haunt between the implantation site at extrusion position, and is provided with to the helical spring 50 that does not have the implantation site to lock pin 48 application of forces; Said extrusion position is meant; Outstanding and card ends the position of on the hammer 22 that fastens with arm 21, retreating with restriction hammer 22 to lock pin 48 from main shaft 7, and said do not have the implantation site to be meant, lock pin 48 in the main shaft 7 and position that allows hammer 22 to retreat of submerging; Be provided with the pressing lever 46 that can between going-back position and progressive position, slide in the axle center of main shaft 7; Said going-back position is meant; Push lock pin 48 and move it the position of extrusion position; Said progressive position is meant, removes pushing of lock pin 48 moved it the position that there is not the implantation site; The bottom of the installing hole 31 of the tool heads in anvil block 9 is formed with the outstanding preceding through hole 45 of front end that is used for when progressive position, making pressing lever 4, is formed with the state in being installed in installing hole 31 under in the rear end of drill bit 51 and the front end of pressing lever 46 connects and pressing lever 46 is pressed into the portion 52 of going-back position; When being installed in drill bit 51 in the installing hole 31; By the lock pin 48 that moves to extrusion position through pressing lever 46, retreating of restriction hammer 22 stops its engaging/separating action; So that anvil block 9 and the rotation of main shaft 7 one; Thereby not only can use with original conflicting model, can also use, thereby not need respectively tool using and make operation property good with the drill jig formula that does not produce impulsive force.

Especially,, limit hammer 22 and retreat because make engage with hammer 22 with beeline from the side-prominent lock pin 48 of main shaft 7 at this, thus can not can both be connected under the situation to the big load of lock pin 48 effects, the reliability of raising drill jig formula.In addition, because the change in shape of the inside through main shaft 7 and anvil block 9 realizes the drill jig formula,, can keep miniaturization so can not make the total length of impacting screwdriver 1B elongated.And, automatically select the drill jig formula through inserting drill bit 51, do not need as mode 1, the operation ring to be operated, thereby have operability, the better advantage of operation property.

In addition, in aforesaid way 2, can suitably increase and decrease the quantity of lock pin, putting with the card stop bit of hammer can not be the rear end at hammer, and is forward inner peripheral surface.

In addition, in aforesaid way 2, on drill bit, be provided with the portion of being pressed into integratedly, but also can the portion of being pressed into be set to and the portion of being pressed at random be installed on the tool heads of using with the drill jig formula use with respect to a plurality of tool heads mounting or dismounting that comprise drill bit.

[mode 3]

In impact screwdriver 1C shown in Figure 7, the conus portion 47 of pressing lever 46 form more forwards thin more towards, be formed with the roundlet tapering 49 that is in the lock pin 48 that does not have the implantation site in the place ahead of conus portion 47 and carry out chimeric necking part 54.In addition, pressing lever 46 ends on clip (clip) 55 at the end of installing hole 31 card through front end, and is connected with anvil block 9.

And, as shown in Figure 8, be formed with discoid flange 56 at the fore-end of the arm 21 of anvil block 9, be formed with the groove 57 of ring-type at the side face of flange 56.The anvil block 9 here can move forward and backward between going-back position and progressive position; Said going-back position is meant; The position that the back surface of anvil block 9 and the formed end difference 58 of root at the minor diameter part 30 of main shaft 7 connect; Said progressive position is meant, the front surface of flange 56 as shown in Figure 9 with outside the rear of bearing 28, be enclosed within the position that the packing ring 59 on the anvil block 9 connects.

When this anvil block 9 is in going-back position (second place), the conus portion 47 of the pressing lever 46 that moves with anvil block 9 one be positioned at lock pin 48 roundlet tapering 49 the rear and lock pin 48 is moved to do not have the implantation site.On the other hand, when anvil block 9 was in progressive position (primary importance), the conus portion 47 of pressing lever 46 is pushed roundlet tapering 49 made lock pin 48 move to extrusion position, thereby the card that the outer end card is ended at hammer 22 ends in the recess 53.But no matter in which position, the pawl 23 that is in the hammer 22 of progressive position is all kept fastening state with the arm 21 of anvil block 9.

On the other hand; Outside the periphery of hammer shell 6, be with operation ring 41; This operation ring 41 can slide on fore-and-aft direction and can rotate, and makes to be in point symmetry position and to connect the guiding groove 60 that is arranged on the hammer shell towards the pair of pin 42,42 of center axis, and makes in the groove 57 of front end insertion flange 56.Shown in figure 10; This guiding groove 60 is a L word shape; By week upwardly extending first groove 61 and second groove 62 that rearward extends from the end of first groove 61 form; Through operating operation ring 41 slided and rotation in its front and back, can pin 42 be moved into place in the forward position and the rearward position that is positioned at the top of second groove 62 on the top of first groove 61.The forward position of this pin 42 is corresponding to the progressive position of anvil block 9, and the rearward position of this pin 42 is corresponding to the going-back position of anvil block 9.

In above-mentioned such impact screwdriver 1C that constitutes, as shown in Figure 7, when making pin 42 move to rearward position through operation ring 41, as stated, anvil block 9 and pressing lever 46 are retreated, and the active force of lock pin 48 through helical spring 50 is in and do not have the implantation site (conflicting model).Thus, hammer 22 can have with interfering not to be retreated, thereby when the load that acts on anvil block 9 is big, hammer into shape 22 to engage with arm 21/separating action produces impulsive force.

On the other hand, as shown in Figure 9, when making pin 42 move to forward position through operation ring 41, as stated, anvil block 9 and pressing lever 46 advance, and lock pin 48 is pressed against extrusion position and fasten with engaging recessed part 53 (drill jig formula).Thus, retreating of hammer 22 is limited, even it is big to act on the load of anvil block 9, also can not engage/separating action, and main shaft 7 is kept the one rotation with anvil block 9.

Like this, according to the impact screwdriver 1C of aforesaid way 3, main shaft 7 is provided with can and the lock pin 48 that does not haunt between the implantation site at extrusion position; And, be provided with to the helical spring 50 that does not have the implantation site to lock pin 48 application of forces, wherein; Said extrusion position is meant; Outstanding and card ends the position of on the hammer 22 that fastens with arm 21, retreating with restriction hammer 22 to lock pin 48 from main shaft 7, and said do not have the implantation site to be meant, lock pin 48 in the main shaft 7 and position that allows hammer 22 to retreat of submerging; On anvil block 9, be connected with the axle center of perforation main shaft 7 and the pressing lever 46 that the rear end arrives the position of lock pin 48; Anvil block 9 can move forward and backward between progressive position and going-back position; Wherein, said progressive position is meant that the rear end of pressing lever 46 is pushed lock pin 48 and made this lock pin 48 move to the position of extrusion position; Said going-back position is meant that the rear end of pressing lever 46 is removed and made this lock pin 48 move to the position that there is not the implantation site to pushing of lock pin 48; And hammer shell 6 is provided with can be operated anvil block 6 and make its operation ring 41 that between front and back position, slides, when making anvil block 9 move to progressive position through operation ring 41; Retreat to stop the engaging/separating action of hammer 22 through lock pin 48 restriction hammers 22; Make anvil block 9 and the rotation of main shaft 7 one, not only can use with original conflicting model thus, can also use with the drill jig formula that does not produce impulsive force; Thereby need not distinguish tool using, make operation property good.

Particularly,, limit hammer 22 and retreat because make engage with hammer 22 with beeline from the side-prominent lock pin 48 of main shaft 7 at this, thus can under the situation to the big load of lock pin 48 effects both be connected, the reliability of raising drill jig formula.In addition because anvil block 9 itself is moved forward and backward, so that pressing lever 46 advance and retreat move is rational in infrastructure and reliable.

In addition, in aforesaid way 3, when anvil block is in progressive position, realize the drill jig formula, but conus portion that can be through making pressing lever towards on the contrary, and when anvil block is in going-back position, realize the drill jig formula when conus portion is pressed to extrusion position with lock pin.In addition, the structure of the operation ring maintenance on front and back position is not limited to use the structure of the groove of L word shape, also can suitably change, and for example utilizes the such ball of mode 1 and the mortise lock structure of open-work etc.

[mode 4]

In impact screwdriver 1D shown in Figure 11; Also shown in figure 12; Is the point symmetry position at center at anvil block 9 with installing hole 31; Be formed with a pair of through hole 63,63 that connects the front end of anvil block 9 from dead eye 29, in this through hole 63,63, be inserted with to loose fit a pair of connecting rod 64,64 as connecting elements.Connecting rod 64,64 front end separately is positioned at the place ahead of anvil block 9, and is connected with the operation ring 65 of internal diameter greater than the internal diameter of internal diameter installing hole 31, and on the other hand, the rear end of connecting rod 64,64 is connected through the front end of clip 55 with pressing lever 46 in dead eye 29.

Thus, under common state, through being made pressing lever 46 be positioned at going-back position,, make operation ring 65 be positioned at the going-back position that the front end with anvil block 9 connects through the connecting rod 64,64 that becomes one with this pressing lever 46 to the lock pin that does not have the implantation site application of force 48.If pulling process ring 65 forwards is then shown in figure 13 from here, through connecting rod 64,64 pressing lever 46 is advanced, thereby make lock pin 48 overcome the active force of helical spring 50 and can move to extrusion position through conus portion 47.About maintenance at this progressive position; Can be as long as rotatably be equipped with at random to the bent space bar of anvil block 9 lateral bendings at operation ring 65; Make space bar be connected to the front end of anvil block 9 at progressive position, perhaps the other independent distance piece of general is inserted between the front end of operating ring 65 and anvil block 9 and gets final product.

In above-mentioned such impact screwdriver 1D that constitutes, as stated, at the going-back position of pulling process ring 65 (second place) forwards not, anvil block 9 and pressing lever 46 are retreated, and the active force of lock pin 48 through helical spring 50 is positioned at and do not have the implantation site (conflicting model).Thus, hammer 22 can be retreated under the situation of not having interference, so when the load that acts on anvil block 9 became big, hammer 22 carried out producing impulsive force with respect to the action of arm 21 engaging/separation.

On the other hand, when advanced position (primary importance) pulling process ring 65, as stated, anvil block 9 and pressing lever 46 advance, and lock pin 48 is pressed against extrusion position and fastens with engaging recessed part 53.Thus, retreating of hammer 22 is limited, and becomes big even act on the load of anvil block 9, the action that hammer 22 does not carry out with respect to arm 21 engaging/separation yet, thus main shaft 7 is kept the one rotation with anvil block 9.

Like this, according to the impact screwdriver 1D of aforesaid way 4, on the one hand; Main shaft 7 is provided with can and the lock pin 48 that does not haunt between the implantation site at extrusion position, and, be provided with to the helical spring 50 that does not have the implantation site to lock pin 48 application of forces; Wherein, said extrusion position is meant, outstanding and card ends the position of on the hammer 22 that fastens with arm 21, retreating with restriction hammer 22 to lock pin 48 from main shaft 7; Said do not have the implantation site to be meant, lock pin 48 in the main shaft 7 and position that allows hammer 22 to retreat of submerging; On the other hand; Be provided with the pressing lever 46 that can between progressive position and going-back position, move forward and backward in the axle center of main shaft 7, make pressing lever 46 and connect the connecting rod 64 that anvil block 9 and front end be projected into the place ahead of anvil block 9 in the axial direction and be connected, wherein; Said progressive position is meant; Pressing lever 46 is pushed lock pin 48 and is moved it the position to extrusion position, and said going-back position is meant that pressing lever 46 is removed pushing of lock pin 48 moved it to the position that there is not the implantation site; When making pressing lever 46 move to progressive position through being operatively connected bar 64; Retreat to stop the engaging/separating action of hammer 22 through lock pin 48 restriction hammers 22; So that anvil block 9 and the rotation of main shaft 7 one not only can use with original conflicting model thus, can also use with the drill jig formula that does not produce impulsive force; Thereby need not distinguish tool using, make operation property good.

Especially, at this, making fastens with beeline and hammer 22 from the side-prominent lock pin 48 of main shaft 7 limits hammer 22 and retreats, thereby can improve the reliability of drill jig formula under the situation to the big load of lock pin 48 effects both being connected.In addition, because can carry out the operation of switch mode, so also easy operating from the place ahead of anvil block 9.

In addition, in aforesaid way 4, when pressing lever and connecting rod are positioned at progressive position, realize the drill jig formula, but conus portion that can be through making pressing lever towards on the contrary, when going-back position, make conus portion boost lock pin and realize the drill jig formula to extrusion position.In addition, be not limited to a pair of connecting rod of aforesaid way 4, can use a bar, perhaps use the connecting rod more than 3 as connecting elements.Can certainly not use bar, and use the tabular shape that waits other.

[mode 5]

In impact screwdriver 1E shown in Figure 14, pressing lever 46 likewise is connected with anvil block 9 with mode 3, and the main shaft 7 that maintains lock pin 48 can move forward and backward with hammer 22.The retaining part of the planetary gear 18 on main shaft 7 and be used between the packing ring 66 of rear end of support helix spring 24 outside be with connecting ring 67, this connecting ring 67 becomes one on fore-and-aft direction with main shaft 7 through the active force of helical spring 24.Periphery at this connecting ring 67 is provided with the tube portion 68 of forwards extending continuously.

On the other hand; Can be movably forward and backward outer being with at point symmetry position makes the operation ring 41 of pair of pin 42,42 towards center axis at the rear of hammer shell 6, is inserted in the groove 69 of ring-type of periphery formation of a portion 68 connecting the front end with pin 42, the 42 same guiding groove 60 of Figure 10 that on hammer shell 6, form.

Thus, shown in figure 14 when making operation ring 41 slide into first groove 61 that pin 42 arrives guiding grooves 60 progressive position in the end that makes progress in week, through connecting ring 67 main shaft 7 is forwards moved with hammer 22.At this moment, the pressing lever 46 that is connected with anvil block 9 does not move, thereby the lock pin 48 that advances with main shaft 7 moves and by to not having the implantation site application of force to the place ahead of conus portion 47.On the contrary; When making operation ring 41 slide into the going-back position of pin 42 arrival second rear end of groove 62 on fore-and-aft direction; Shown in figure 15, through connecting ring 67 main shaft 7 is rearward moved with hammer 22, thereby; The lock pin of retreating with main shaft 7 48 moves to extrusion position along the active force that conus portion 47 overcomes helical spring 50, and then fastens with the engaging recessed part 53 of hammering 22 into shape.

In addition, in the periphery of the front end that is in bearing 28 of anvil block 9, on circumferentially, equally spaced be formed with a plurality of elongated slots 70,70, chimeric in the groove 71 of each elongated slot 70 and the ring-type of the front end inner peripheral surface that is arranged at bearing 28 have a ball 72.Be with packing ring 73,73 outside between ball 72 and sleeve 33 and limit moving of ball 72.Thus, as stated, even main shaft 7 is retreated, the thrust load that is applied on the anvil block 9 is born by hammer shell 6 via ball 72 and bearing 28.

In above-mentioned such impact screwdriver 1E that constitutes, as stated, when making main shaft 7 move to progressive position (second place) through operation ring 41, the active force of lock pin 48 through helical spring 50 is in and do not have the implantation site.Thus, hammer 22 can be retreated under the situation of not having interference, thereby when the load that acts on anvil block 9 became big, hammer 22 carried out producing impulsive force with respect to the action of arm 21 engaging/separation.

On the other hand, when making main shaft 7 move to going-back position (primary importance) through operation ring 41, as stated, lock pin 48 is pressed against extrusion position and fastens with engaging recessed part 53.Thus, retreating of hammer 22 is limited, and becomes big even act on the load of anvil block 9, do not carry out the engaging/separating action with respect to arm 21, thereby main shaft 7 is kept the one rotation with anvil block 9.

Like this; According to the impact screwdriver 1E of aforesaid way 5, main shaft 7 is provided with and can and the lock pin 48 that does not haunt between the implantation site at extrusion position, and is provided with to the helical spring 50 that does not have the implantation site to lock pin 48 application of forces; Wherein, Said extrusion position is meant, outstanding and card ends the position of on the hammer 22 that fastens with arm 21, retreating with restriction hammer 22 to lock pin 48 from main shaft 7, and said do not have the implantation site to refer to lock pin 48 in the main shaft 7 and position that allows hammer 22 to retreat of submerging; On the other hand; On anvil block 9, be connected with the axle center of perforation main shaft 7 and the pressing lever 46 that the rear end arrives the position of lock pin 48; Main shaft 7 can move forward and backward between going-back position and progressive position, and hammer shell 6 is provided with and can makes its operation ring 41 that slides into front and back position by operation axis 7, wherein; Said going-back position is meant; The position that lock pin 48 moves it extrusion position is pushed in the rear end of pressing lever 46, and said progressive position is meant that the rear end of pressing lever 46 is removed pushing of lock pin 48 moved it the position that there is not the implantation site; When making main shaft 7 move to going-back position through operation ring 41; Retreat the engaging/separating action that stops hammer 22 through lock pin 48 restriction hammers 22; Thereby make anvil block 9 and the rotation of main shaft 7 one, not only can use with original conflicting model thus, can also use with the drill jig formula that does not produce impulsive force; Thereby need not distinguish tool using, and make operation property good.

Especially, at this, making fastens with beeline and hammer 22 from the side-prominent lock pin 48 of main shaft 7 limits hammer 22 and retreats, thereby can under the situation to the big load of lock pin 48 effects both connected, thereby improves the reliability of drill jig formula.

In addition, in aforesaid way 5, when main shaft is positioned at going-back position, realize the drill jig formula, but conus portion that can be through making pressing lever towards oppositely, when progressive position, conus portion boosts lock pin to extrusion position and realizes the drill jig formula.

[mode 6]

In impact screwdriver 1F shown in Figure 16; Same with mode 3; Anvil block 9 can and be sold 42 through operation ring 41 and move forward and backward; At this, the push projection 74 loose fits ground that will be provided with in the back surperficial axle center of anvil block 9 is inserted in the support recess 75 of front surface axle center setting of main shaft 7, and the front end of main shaft 7 is connected with anvil block 9.

In addition, shown in figure 17, the front end as the V-shaped valley 26 of tipper that on main shaft 7, is provided with is provided with the limiting groove 76 that forwards extends continuously, is formed with the open-work 77 that is communicated with support recess 75 in the bottom of limiting groove 76.Promptly; Insert the going-back position that supports the anvil block 9 in the recess 75 fully at push projection 74; Push projection 74 stops ball 27 to get in the limiting groove 76 (upper portion among Figure 17) via the bottom that open-work 77 is projected into limiting groove 76; Only be inserted into the progressive position of the anvil block 9 of the front end that supports recess 75 at push projection 74, the bottom of push projection 74 and limiting groove 76 is separated and allows ball 27 to get in the limiting grooves 76 (lower portion among Figure 17).

In above-mentioned such impact screwdriver 1F that constitutes; Shown in figure 18; When making anvil block 9 slide into going-back position through operation ring 41, push projection 74 is retreated hammer 22 and the ball 27 pushed by helical spring 24, as stated; Push projection 74 inserts fully and supports in the recess 75 and be projected into the bottom of limiting groove 76, thereby stops ball 27 to get into limiting grooves 76.Thus, when main shaft 7 rotation, hammer 22 also with the rotation of main shaft 7 one, when the load that acts on anvil block 9 became big, the action that hammer 22 is carried out with respect to arm 21 engaging/separation through the rolling of ball 27 V-shaped valley 26 in was with the generation impulsive force.

On the other hand, when making anvil block 9 slide into progressive position through operation ring 41, as stated, push projection 74 is separated with the bottom of limiting groove 76.So, ball 27 by through helical spring 24 forwards the hammer 22 of the application of force push and get in the limiting groove 76, hammer 22 is connected with main shaft 7 through ball 27, and, this ball 27 in limiting groove 76 to circumferential mobile being limited of main shaft 7.Thus, big even the load of anvil block 9 becomes, hammer 22 can not carry out the action with respect to arm 21 engaging/separation yet, and rotates with main shaft 7 one.Thereby anvil block 9 also rotates with main shaft 7 one.

Like this, according to the impact screwdriver 1F of aforesaid way 6, on the one hand, be provided with continuously towards the place ahead at the front end of V-shaped valley 26 and be used to make ball 27 to break away from the limiting groove 76 of V-shaped valleys 26; On the other hand; Front part at main shaft 7 is provided with the support recess 75 that is communicated with the bottom of limiting groove 76; Back quadrate part at anvil block 9 is provided with the push projection 74 that is entrenched in the support recess 75 and is projected into the bottom of limiting groove 76, and anvil block 9 can move forward and backward between progressive position and going-back position in supporting recess 75, and; Hammer shell 6 is provided with can be operated anvil block 9 and make it slide into the operation ring 41 of progressive position and going-back position; Wherein, said progressive position is meant that the bottom of push projection 74 and limiting groove 76 is separated and allows ball 27 to get into the position of limiting grooves 76; Said going-back position is meant that push projection 74 is projected into the bottom of limiting groove 76 and stops ball 27 to get into the position of limiting groove 76; When making anvil block 9 slide into progressive position through operation ring 41; Make ball 27 get into limiting groove 76 to stop the engaging/separating action of hammer 22; Make anvil block 9 and the rotation of main shaft 7 one, thereby not only can use, can also use with the drill jig formula that does not produce impulsive force with original conflicting model; Need not distinguish tool using thus, make operation property good.

Especially, at this, the rolling that is used to connect the main shaft 7 and the ball 27 of hammer 22 through prevention limits hammer 22 and retreats, thereby can stop the engaging/separating action of hammer 22 reliably, and improves the reliability of drill jig formula.In addition, because the shape that needs only main shaft 7 and anvil block 9 changes, can suppress cost increases so can reduce number of components.

In addition, in aforesaid way 6, be not limited to through the operation ring anvil block moved forward and backward, can suitably change, for example setting can spur or be pressed into the control member of front etc.

And in modes, for example housing is not limited to by body shell and the mode that becomes of hammer hull shape, and for example body shell is one-piece type with the hammer shell, the type that do not have extension etc., and the mode of housing and other mechanisms can suitably change.Certainly, except impacting screwdriver, angle impacts in the percussion tool that screwdriver (angle impact driver) and impact wrench (impact wrench) wait other also can adopt the present invention.

The explanation of Reference numeral

1A～1F ... Impact screwdriver, 2 ... Body shell, 4 ... Motor, 5 ... Output shaft, 6 ... The hammer shell, 7 ... Main shaft, 8 ... Beater mechanism, 9 ... Anvil block; 21 ... Arm, 22 ... Hammer, 23 ... Pawl, 24 ... Helical spring, 26 ... V-shaped valley, 27 ... Ball, 31 ... Installing hole; 34 ... Attachment ring, 35 ... Connecting pin, 40 ... Groove, 41 ... The operation ring, 44 ... Back through hole, 45 ... Preceding through hole, 46 ... Pressing lever; 47 ... Conus portion, 48 ... Lock pin, 49 ... The roundlet tapering, 50 ... Helical spring, 51 ... Drill bit, 52 ... Be pressed into portion, 53 ... Engaging recessed part; 56 ... Flange, 60 ... Guiding groove, 61 ... First groove, 62 ... Second groove, 64 ... Connecting rod, 65 ... The operation ring, 67 ... Connecting ring; 68 ... Tube portion, 70 ... Elongated slot, 72 ... Ball, 74 ... Push projection, 75 ... Support recess, 76 ... Limiting groove, 77 ... Open-work.

Claims (18)

1. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is converted into rotary impact power is passed to said anvil block,

Connecting elements is arranged at the place ahead of said arm in said housing, and makes rearward outstanding connecting pin connect the next and said anvil block one rotation of said arm; And said connecting elements can move forward and backward between progressive position and going-back position, wherein; Said progressive position is meant that said connecting pin only connects the position of said arm, and said going-back position is meant; Said connecting pin connects said arm and is inserted in the position in the blind hole that the front surface of said hammer forms

Control member is arranged on the said housing, can operate said connecting elements and slide into said progressive position and said going-back position;

When making said connecting elements move to said going-back position through said control member; Through said connecting elements said hammer and arm are become one on direction of rotation; Engaging/the separating action that stops said hammer is so that said anvil block and the rotation of said integrated spindle axis.

2. percussion tool as claimed in claim 1 is characterized in that,

Said connecting elements is an attachment ring, is formed with the groove of ring-type at the outer peripheral face of this attachment ring,

Said control member is the operation ring, the outer outer surface that is enclosed within said housing of this operation ring, and have pin, this pin connects the slotted hole of the fore-and-aft direction that on said housing, forms and inserts in the said groove.

3. percussion tool as claimed in claim 2 is characterized in that,

Said arm is provided with a pair of at point symmetry position, said connecting pin is provided with a pair of at point symmetry position, on the other hand,

Respectively with each position that said pawl fasten with matching be provided with 4 said blind holes in the dextrorotation veer with being rotated counterclockwise on the direction with said arm.

4. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is passed to said anvil block as rotary impact power,

Lock pin is arranged on the said main shaft, and can and not have between the implantation site at extrusion position and haunt; Wherein, said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft; To limit the position that said hammer is retreated; Said do not have the implantation site to be meant, this lock pin in the said main shaft and position that allows said hammer to retreat of submerging

Application of force unit applies the active force that does not have the implantation site to said to said lock pin,

Pressing lever is arranged on the axle center of said main shaft, and can between going-back position and progressive position, slides; Wherein, Said going-back position is meant, pushes said lock pin and makes said lock pin to the position that said extrusion position moves, and said progressive position is meant; Releasing makes said lock pin to the said position that there is not the implantation site to move to pushing of said lock pin

Prolong the bottom, be arranged on the bottom that being used in the said anvil block install the installing hole of said tool heads, the front end of said pressing lever is projected into when said progressive position bottom this prolongations,

Be pressed into portion, be arranged on the rear end of specific tool heads, be connected to the front end of said pressing lever under the installment state in being installed on said installing hole, to be pressed into said pressing lever to said going-back position;

When being installed in said specific tool heads in the said installing hole; Through move to the said lock pin of said extrusion position by said pressing lever; Limit said hammer and retreat, thereby stop the engaging/separating action of said hammer, so that said anvil block and the rotation of said integrated spindle axis.

5. percussion tool as claimed in claim 4 is characterized in that,

End in the said spindle axis side of the rear end of said pressing lever and said lock pin is formed with conus portion respectively, through the guiding function between the conical surface of said conus portion, said pressing lever advanced position is moved.

6. percussion tool as claimed in claim 4 is characterized in that,

Said lock pin begin to be from the axle center of said main shaft be provided with radially a plurality of.

7. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is passed to said anvil block as rotary impact power,

Lock pin is arranged on the said main shaft, and can and not have between the implantation site at extrusion position and haunt; Wherein, said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft; To limit the position that said hammer is retreated; Said do not have the implantation site to be meant, this lock pin in the said main shaft and position that allows said hammer to retreat of submerging

Application of force unit applies the active force that does not have the implantation site to said to said lock pin,

Pressing lever is connected with said anvil block, connects the axle center of said main shaft and the position that its rear end arrives said lock pin;

Said anvil block can move forward and backward between the primary importance and the second place; Wherein, said primary importance is meant that said lock pin is pushed in the rear end of said pressing lever makes said lock pin move to the position of said extrusion position; The said second place is meant; The rear end of said pressing lever is removed and is made said lock pin move to the said position that there is not the implantation site to pushing of said lock pin, on the other hand

Said housing is provided with control member, and this control member can be operated said anvil block and slide into the said primary importance and the said second place,

When making said anvil block move to said primary importance, limit said hammer through said lock pin and retreat the engaging/separating action that stops said hammer, so that said anvil block and the rotation of said integrated spindle axis through said control member.

8. percussion tool as claimed in claim 7 is characterized in that,

Be formed with the conus portion that attenuates towards the place ahead in the rear end of said pressing lever.

9. percussion tool as claimed in claim 7 is characterized in that,

The fore-end of the said arm on said anvil block is provided with flange, and is formed with the groove of ring-type at the side face of this flange, on the other hand,

Said control member is the operation ring, and this operation ring has pin, and this pin connects the guiding groove that on said housing, is provided with and inserts in the said groove.

10. percussion tool as claimed in claim 9 is characterized in that,

Said guiding groove is a L word shape; Comprise second groove and the first circumferential groove, wherein, an end of said first groove is corresponding to the said primary importance of said anvil block; Said second groove extends at fore-and-aft direction from the other end of this first groove, and the end of said second groove is corresponding to the said second place.

11. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is passed to said anvil block as rotary impact power,

Lock pin is arranged on the said main shaft, and can and not have between the implantation site at extrusion position and haunt; Wherein, said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft; To limit the position that said hammer is retreated; Said do not have the implantation site to be meant, this lock pin in the said main shaft and position that allows said hammer to retreat of submerging

Application of force unit applies the active force that does not have the implantation site to said to said lock pin,

Pressing lever is arranged on the axle center of said main shaft, and can between the primary importance and the second place, moves forward and backward; Wherein, Said primary importance is meant, pushes said lock pin and makes said lock pin to the position that said extrusion position moves, and the said second place is meant; Releasing makes said lock pin to the said position that there is not the implantation site to move to pushing of said lock pin

Connecting elements is connected with said pressing lever, and, connect said anvil block in the axial direction and make front end be projected into the place ahead of said anvil block;

When operating said connecting elements and make said pressing lever move to said primary importance, limit engaging/separating action that retreating of said hammer stops said hammer through said lock pin, so that said anvil block and the rotation of said integrated spindle axis.

12. percussion tool as claimed in claim 11 is characterized in that,

Be formed with the conus portion that attenuates towards the place ahead in the rear end of said pressing lever.

13. percussion tool as claimed in claim 11 is characterized in that,

Said connecting elements comprises:

A pair of connecting rod connects the different position on said anvil block, and said diverse location is a central point with the installing hole that is used to install said tool heads;

Operation ring, the front end in the place ahead of said anvil block with said connecting rod is connected to each other.

14. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is passed to said anvil block as rotary impact power,

Lock pin is arranged on the said main shaft, and can and not have between the implantation site at extrusion position and haunt; Wherein, said extrusion position is meant, outstanding and card ends on the said hammer that fastens with said arm this lock pin from said main shaft; To limit the position that said hammer is retreated; Said do not have the implantation site to be meant, this lock pin in the said main shaft and position that allows said hammer to retreat of submerging

Application of force unit applies the active force that does not have the implantation site to said to said lock pin,

Pressing lever is connected with said anvil block, connects the axle center of said main shaft and the position that its rear end arrives said lock pin;

Said main shaft can move forward and backward between the primary importance and the second place; Wherein, said primary importance is meant that said lock pin is pushed in the rear end of said pressing lever makes said lock pin move to the position of said extrusion position; The said second place is meant; The rear end of said pressing lever is removed and is made said lock pin move to the said position that there is not the implantation site to pushing of said lock pin, on the other hand

Said housing is provided with control member, and this control member can be operated said main shaft and slide into the said primary importance and the second place,

When making said main axle moving through said control member, limit said hammer through said lock pin and retreat the engaging/separating action that stops said hammer, so that said anvil block and the rotation of said integrated spindle axis to said primary importance.

15. percussion tool as claimed in claim 14 is characterized in that,

On said main shaft, be provided with connecting ring integratedly, be formed with the groove of ring-type in the periphery of this connecting ring, on the other hand,

Said control member is the operation ring, is enclosed within on the said housing outside this operation ring, and has pin, and this pin connects the guiding groove that on said housing, is provided with and inserts in the said groove.

16. percussion tool as claimed in claim 15 is characterized in that,

Said guiding groove is a L word shape; Comprise second groove and the first circumferential groove; Wherein, One end of said first groove is corresponding to the said primary importance of said anvil block, and said second groove extends upward in front and back from the other end of this first groove, and the end of said second groove is corresponding to the said second place.

17. a percussion tool is characterized in that,

Comprise:

Main shaft is rotated by motor in housing,

Anvil block, at the place ahead of said main shaft and said main shaft coaxially by said housings support for rotating, and the front end that is used for the erecting tools head is outstanding to the place ahead of said housing, and outstandingly in the rear end is provided with radial arm,

Hammer be used for the pawl that fastens with said arm outstanding being provided with of front surface, and be enclosed within outward on the said main shaft, and this hammer engages/separates with said arm according to the moment of torsion of said anvil block, and the rotation of said main shaft is passed to said anvil block as rotary impact power,

Be connected said main shaft and hammer in the ball, the outer peripheral face through being entrenched in said main shaft and the inner peripheral surface of hammer, and, through rolling being arranged with in the tipper of the outer peripheral face side of said main shaft, thereby said hammer is engaged/separating action,

Limiting groove is provided with towards the place ahead at the front end of said tipper continuously, is used to make said ball to break away from said tipper,

Support recess, be arranged on the front part of said main shaft, and be connected with the bottom of said limiting groove,

Push projection is arranged on the back quadrate part of said anvil block, and with said support recess tabling and be projected into the bottom of said limiting groove;

Said anvil block moves forward and backward between progressive position and going-back position in said support recess; Wherein, said progressive position is meant that the bottom of said push projection and said limiting groove is separated and allows said ball to get into the position of said limiting groove; Said going-back position refers to; Be projected into the bottom of said limiting groove at said push projection and stop said ball to get into the position of said limiting groove, on the other hand

Said housing is provided with control member, and this control member can be operated said anvil block and slide into said progressive position and said going-back position,

When making said anvil block slide into said progressive position, make said ball get into engaging/separating action that said limiting groove stops said hammer, so that said anvil block and the rotation of said integrated spindle axis through said control member.

18. percussion tool as claimed in claim 17 is characterized in that,

The fore-end of the said arm on said anvil block is provided with flange, on the side face of this flange, is formed with the groove of ring-type,

On the other hand, said control member is the operation ring, and this operation ring has pin, and this pin connects the guiding groove that on said housing, is provided with and inserts in the said groove.

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