CN2302093Y - Driving device for electric screwdriver - Google Patents

Abstract

The utility model relates to a driving device for electric screwdrivers, and is composed of a braking wing, a braking ring matched with the braking wing, a latch which is penetrated through the brake wing and the braking ring and the brake ring and is inserted in a main body, a braking shaft penetrating through the main body and the braking ring, a thrust ring, a claw ring and a positioning cover which are sheathed on a convex shaft arranged on the rear end of the main body and fixed by a retaining ring, pushing bolts which are respectively provided with a spring and are penetrated on the main body and the braking ring, etc., wherein, the number of the pushing bolts is a complex number; the claw ring is composed of arc claws which are divided with the number of a complex number. Sleeve holes sheathed on the convex shaft is arranged in the claw ring. The abdomen of the claw ring is provided with a circular groove which can be sheathed with an elastic element. The device has intermittent instantaneous starting force, and unscrews the screw smoothly.

Description

The transmission device of electric screw driver

The utility model relates to the transmission device of electric screw driver.

The transmission device of common electric screw driver only cooperates the power transmission shaft rotation to produce the strength of rotary screw with motor, does not have intermittent moment startup strength or be rotated at screw and produce intermittent moment halted state when smooth; Therefore this known electric screw driver transmission device has following shortcoming:

1. in bad repair for a long time or that do not maintain for a long time then tire, screw is locked on the spoke most tight, just begun to outward winding moment of screw needs to start greatly strength, general known electric screw driver transmission device does not have this flashy startup strength, so the screw to excessively tight lock is difficult for outwarding winding, and easily the hexagonal strand of screw is decreased.

Since not tool intermittent moment start strength, can't be when screw is threaded to closely the position with its normality Power of Spin screw of outwarding winding smoothly.

3. even the market has the electric screw driver transmission device of intermittent moment startup function, its manufacturing cost is higher, the assembling difficulty, and the consumption worker, consumptive material, consuming time, cost an arm and a leg deficiency in economic performance.

The main purpose of the utility model provides a kind of " transmission device of electric screw driver ", has intermittent moment startup strength, make the end user outward winding screw smoothly and can not twist the damage screw, and have simple structure, assembling is easy, the saving of labor, save time, economize material,, have obvious economic benefit so can reduce cost.

The purpose of this utility model is to realize like this, the i.e. transmission device of the electric screw driver that is provided, comprise the braking wing, the brake hoop that cooperates with this braking wing, run through this braking wing and brake hoop and insert in latch on the main body, run through the brake axle of this main body and brake hoop and be placed in throw-out collar, dog collar and locating cover on set prominent of the body rear, and fixed with clasp, the plural number that is equipped with each tool flexible member simultaneously on this main body and brake hoop pushes away said elements such as bolt; Wherein this dog collar is made of the arc pawl that is divided into plural number, has the trepanning that is placed on the prominent axle in this dog collar, at dog collar belly tool circular groove, allows to be nested with flexible member on this circular groove.

According to the transmission device of electric screw driver of the present utility model, arc pawl that wherein should plural number respectively has the arc groove so as to cooperating the default inclined end face of throw-out collar.

Transmission device according to electric screw driver of the present utility model, wherein this end that pushes away bolt has and cooperates on the main body default plural hole and cooperate default plural screw on its brake hoop, can run through the plural hole of this main body and be locked in screw thread on the plural screw of brake hoop.

According to the transmission device of electric screw driver of the present utility model, wherein default braked wheel is provided with the tire of plural number on brake axle, so as to the swing by the braking wing.

Stating conformation function and effect that running produced on the utility model is, having intermittent moment during for the screw that adapts to the loading and unloading tire or other loading and unloading screws starts strength, can screw is closely sealed, or dismantle it, especially for difficult loading and unloading tire or other locking devices of long neglected and in disrepair or failure to maintain, effect is very big, and this intermittent moment starts the function of strength, can outward winding rapidly closing the screw that is difficult for outwarding winding, or locking.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

Fig. 1 is the exploded perspective view of the utility model embodiment;

Fig. 2 is the assembled sectional view of the utility model embodiment;

Fig. 3 is the action schematic diagram that the utility model embodiment combination is analysed and observe;

Fig. 4 is the dog collar exploded perspective view of the utility model embodiment;

Fig. 5 is the dog collar partial schematic diagram of the utility model embodiment.

As shown in Figure 1, the utility model by the braking wing 20, the brake hoop 21 that cooperates with this braking wing 20, run through this braking wing 20 and brake hoop 21 and insert in main body 22 latch 23, run through the brake axle 24 of this main body 22 and brake hoop 21, and be placed in throw-out collar 26, dog collar 10 and locating cover 28 on the main body 22 back distal process axles 25, and fixed with clasp 27, three bolt 29 said elements such as grade that push away that are mutually 120 degree that are provided with each tool spring 34 simultaneously on this main body 22 are formed.Wherein, the braking wing 20 is to be reclinate watt of shape, and this braking wing 20 has left and right sides flank 202, and its effect is limited by the tire 246 of the braked wheel 245 of brake axle 24; Be positioned at the middle latch tube 201 that is provided with horizontal processus aboralis in the braking wing 20 rear ends, the end face of this latch tube 201 and its bottom surface are the sliding surface of scalariform respectively, it is the square breach 212 that the central orientation, flange 211 tops that cooperates brake hoop 21 peripheries of this braking wing 20 to have annular is preset, promptly this breach 212 slips into as the latch tube 201 that cooperates the braking wing 20, makes the brake hoop 21 can be successfully along horizontal sliding; The flange 211 of this brake hoop 21 is provided with three screws 214 that push away bolt 29 usefulness that are mutually 120 degree; These brake hoop 21 central authorities have the axis hole 215 that tolerable brake axle 24 levels are passed through; This main body 22 roughly becomes cylinder casket shape, central authorities have the abdomen mouth 221 of accommodating the braking wing 20 and brake hoop 21, be connected with antetheca 222 at abdomen mouth 221 front ends, these antetheca 222 central authorities are penetrated with the cinclides 223 of allowing that brake axle 24 passes through, and run through the pin-and-hole 224 of allowing that latch 23 passes through in antetheca 222 upper end central authorities; Be provided with rear wall 225 in abdomen mouth 221 rear ends, be provided with prominent axle 25 in rear wall 225 rear end central authorities, be provided with the square clasp seat 251 that cooperates clasp 27 in prominent axle 25 rear ends, these clasp seat 251 4 corners have the angle ditch 253 of location clasp 27 usefulness respectively, are provided with the axle sleeve 252 of supporting brake axle 24 rear ends in clasp seat 251 rear ends; Be provided with on wall 225 peripheries after prominent axle 25 around this three with respect to brake hoop on three screw 214 orientation be mutually 120 countersunks 226 of spending angles; These main body rear wall central authorities have the minor axis hole 227 that the less minor axis 241 of terminal set diameter of allowing brake axle 24 passes through, this minor axis hole 227 is divided into larger-diameter preceding hole 228 and metapore 229 (seeing shown in Fig. 2,3) than minor diameter, be for cooperate this minor axis 241 than major diameter front axle 242 with than minor diameter rear axle 243 by setting; Convergence part at this front axle 242 and rear axle 243 is arranged with bearing 244 (seeing shown in Fig. 2,3), has large diameter braked wheel 245 being connected with in this minor axis 241 front ends, be provided with the tire that upwards is ratchet shape 246 that cooperates the braking wing 20 respectively at braked wheel 245 left and right sides, be provided with square axle head 247 at brake axle 24 front ends, the effect of this square axle head 247 is that engage sleeves puts lock and unload the hexagonal plate tube (not shown) of spoke screw; In cinclides 223 positions of body front wall 222, be provided with the location that is placed on the brake axle 24 with bearing 248 (seeing shown in Fig. 2,3); Be equipped with throw-out collar 26 on the prominent axle 25 of body rear, this throw-out collar 26 roughly is conical ring, and its inclined end face 261 is ecto-entad rear-inclineds; Be equipped with dog collar 10 again behind throw-out collar, see shown in Fig. 4,5, this dog collar 10 is mutually the 120 arc pawls 11 that separate of degree by three and combines, and cooperates institute to form by ring-spring 12; When these three arc pawl 11 composite entities become dog collar 10, cooperate shown in each figure as Fig. 5, have the trepanning 13 that is placed on the prominent axle 25 in dog collar 10 central authorities, present the recessed scalariform circular groove 14 of annular at dog collar 10 outer peripheral face bellies, this circular groove 14 is allowed ring-spring 12 tight Shu Qizhong; At these three arc pawls 11 arc groove 15 is arranged, the effect of these three arc grooves 15 is to cooperate the throw-out collar inclined end face 261 in its place ahead, makes to be convenient to make this dog collar 10 of throw-out collar 26 pushers; Buckle at the prominent axle 25 rear end clasp seats 251 of main body and to be provided with clasp 27, so as to the locating cover 28 (seeing shown in Fig. 2,3) of locating its front end, these locating cover 28 central authorities have the square opening 281 (seeing shown in Figure 1) that can be placed on the clasp seat 251, this locating cover 28 roughly is the truncated cone shape, can cover and locate the rearward end of main body 22, and main body axle sleeve 252 positions that protrude in after the locating cover 28 are ends of outstanding this brake axle, this end is equipped with bearing 30, and is connected in the collar bush 33 of motor 31 main shafts 32 and (sees shown in Fig. 2,3); Push away bolt 29 its ends three of aforementioned body and have the screw thread 291 (cooperating shown in Figure 1) that cooperates three screws 214 that are locked in brake hoop 21 respectively, this push away bolt 29 end thread 291 run through main body rear wall 225 three countersunks 226 and be locked in respectively on three screws 214 of brake hoop, and three bolt heads 292 that push away bolt 29 have the effect of throw-out collar 26 fronts, contact its rear end, and when throw-out collar 26 is subjected to dog collar 10 effect and when three of ejections push away bolt 29 forward, these three push away bolt 29 and promptly take advantage of a situation and drive its terminal brake hoop 21 displacement forward and (cooperate Fig. 2, shown in 3), on the contrary then displacement backward.

Shown in Fig. 2,3, these latch 23 levels run through body front wall 222 upper end pin-and-holes 224, via the braking wing 20 of abdomen mouth 221 tops of main body and by the square breach 212 of its rear brake hoop 21 level insert main body rear wall 225 upper end holes location; This moment, the braked wheel 245 of brake axle 24 approached antetheca 222; See shown in Figure 2, when motor starting, because the left side of the braking wing 20 or right side flap 202 are blocked by its below brake hoop 21 and can't arbitrarily be swung, therefore, braked wheel 245 in the abdomen mouth 221 of main body is able to smooth rotation with its brake axle 24, but with its motor rotary speed when fast more, promptly cause to be positioned at that main body rear dog collar 10 produces centrifugal force and three arc pawls 11 of this dog collar 10 are outwards supported ring spring 12, so that as shown in Figure 3 dog collar 10 states separately separately; Because three arc pawls 11 of this dog collar 10 separate separately, its the place ahead throw-out collar 26 is subjected to it to push away the effect that bolt 29 pushes up backward simultaneously, and the inclined end face 261 that makes this throw-out collar 26 is resisted against arc groove 15 positions of dog collar 10 backward, and this to push away bolt 29 be owing to be subjected to the backward pull effect and backward pushing tow throw-out collar 26 of its spring 34, and drive brake hoop 21 displacement backward of its end (the place ahead), and owing to continue left and right sides tire 246 effects of the braked wheel 245 in the rotation, and make its left and right sides flank 202 one of them the braking wing 20 that can freely swing on it is blocked, then moment makes brake axle 24 stop operating (operating state as shown in Figure 3); But the arc pawl 11 that causes the dog collar 10 that makes the main body rear is because of losing centrifugal force at once and being subjected to ring spring 12 contraction strength to return back to as shown in Figure 2 previous status because this stops operating, also cause this throw-out collar 26 to be moved to main body rear surface location forward, and the order push away bolt 29 drive forward brake hoop 21 forward displacement and block the braking wing 20, and promptly discharge the braked wheel tire 246 of this brake axle 24 and make brake axle 24 reply rotation status (replying operating state as shown in Figure 2), reach the purpose of loading and unloading screw as above-mentioned running repeatedly.

The above is the utility model preferred embodiment only, is not to be used to limit the scope that the utility model is implemented.Be that all equalizations of being done according to claim scope of the present utility model change and modification, be all the utility model claim scope and cover.

Claims (4)

1. the transmission device of an electric screw driver, it comprises the braking wing, the brake hoop that cooperates with this braking wing, runs through this braking wing and brake hoop and inserts in latch on the main body, run through the brake axle of this main body and brake hoop and be placed in throw-out collar, dog collar and locating cover on set prominent of the body rear, and fixed with clasp, the plural number that is equipped with each tool flexible member simultaneously on this main body and brake hoop pushes away said elements such as bolt; Wherein this dog collar is made of the arc pawl that is divided into plural number, has the trepanning that is placed on the prominent axle in this dog collar, at dog collar belly tool circular groove, allows to be nested with flexible member on this circular groove.

2. the transmission device of electric screw driver as claimed in claim 1 is characterized in that, arc pawl that wherein should plural number respectively has the arc groove so as to cooperating the default inclined end face of throw-out collar.

3. the transmission device of electric screw driver as claimed in claim 1, it is characterized in that, wherein this end that pushes away bolt has and cooperates on the main body default plural hole and cooperate default plural screw on its brake hoop, can run through the plural hole of this main body and be locked in screw thread on the plural screw of brake hoop.

4. the transmission device of electric screw driver according to claim 1 is characterized in that, wherein default braked wheel is provided with the tire of plural number on brake axle, so as to the swing by the braking wing.

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