WO1997033722A1 - Power nutrunner with torque release clutch and a setting tool - Google Patents

Power nutrunner with torque release clutch and a setting tool Download PDF

Info

Publication number
WO1997033722A1
WO1997033722A1 PCT/SE1997/000409 SE9700409W WO9733722A1 WO 1997033722 A1 WO1997033722 A1 WO 1997033722A1 SE 9700409 W SE9700409 W SE 9700409W WO 9733722 A1 WO9733722 A1 WO 9733722A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
spring
setting tool
opening
screw element
Prior art date
Application number
PCT/SE1997/000409
Other languages
French (fr)
Inventor
Erik Roland Rahm
Original Assignee
Atlas Copco Tools Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Copco Tools Ab filed Critical Atlas Copco Tools Ab
Priority to EP97908631A priority Critical patent/EP0886560B1/en
Priority to DE69718297T priority patent/DE69718297T2/en
Priority to JP53251397A priority patent/JP4041539B2/en
Priority to US09/142,616 priority patent/US6076438A/en
Publication of WO1997033722A1 publication Critical patent/WO1997033722A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • This invention relates to a power nutrunner of the type having an adjustable torque release clutch.
  • the invention concerns a power nutrunner which comprises a planetary reduction gearing with a ring gear, and a torque release clutch associated with the ring gear, wherein the release clutch includes a thrust element, a cam means, and a pretensioned spring acting between a spring support means movably supported in the housing and the thrust element for exerting an adjustable release point determining bias load on the cam means.
  • a power nutrunner of this type is previously known through US Patent No. 4,084,487.
  • the pretension level of the clutch biassing spring of this power tool is adjustable by a ring nut which engages an external thread on the tool housing.
  • This ring nut is normally covered by a protective exhaust deflector sleeve, and setting of the clutch spring pretension level is rather awkward, since the protective sleeve has to be released and slid aside to get access to the ring nut.
  • This prior art spring support design is disadvantageous also in that it adds to the outer dimensions of the nutrunner housing.
  • the main object of the invention is to provide a power nutrunner of the above described type, wherein the clutch spring support means is compact in design, easily accessible by means of a setting tool without dismantling any tool parts, and still well protected against unintentional displacement.
  • Another object of the invention is to provide a setting tool specially adapted for the adjustable clutch spring support means having the specific features of the invention.
  • Fig 1 shows a longitudinal section through the front part of a power nutrunner according to the invention.
  • Fig 2 shows a fractional section through the power nutrunner shown m Fig 1, but located m a different plane.
  • Fig 3 shows a side elevation of the release clutch included in the power nutrunner shown in Fig 1.
  • Fig 4 shows a front end view of the nutrunner m Fig 1.
  • Fig 5 shows a cross section along line V-V in Fig 1.
  • Fig 6 shows a side elevation of a setting tool according to the invention.
  • the nutrunner illustrated in the drawing figures comprises a motor unit 10 the forward end portion only of which is shown m Fig 1. Since the motor unit 10 does not form any part of the invention a detailed description thereof is not needed and is, therefore, left out of this specification.
  • a housing 11 for a reduction gearing 12 and a torque limiting release clutch 13 To the motor unit 10 there is bolted a housing 11 for a reduction gearing 12 and a torque limiting release clutch 13.
  • An output spindle 14 is connected to the motor unit 10 via the reduction gearing 12 and is provided with a chuck
  • the housing 11 At its forward end, the housing 11 is provided with an end wall 16 in which the output spindle 14 is rotationally ournalled.
  • the end wall 16 is formed with an internal neck portion 17 for providing a proper guidance for the output spindle 14.
  • the bushing 18 is formed with an annular shoulder for transferring axial forces from the spindle 14 to the housing 11.
  • a lock ring 19 and a shock absorbing resilient ring 20 are mounted on the spindle 14 for engagement with the shoulder of the bushing 18. In the opposite direction, the spindle 14 is axially locked by a lock ring 21 cooperating with the inner end of the end wall neck portion 17.
  • the rear end of the housing 11 comprises an end wall 22 which is secured to the motor unit 10 by means of screws 23.
  • the end wall 22 is formed with a ball race 24 for rotational support of a tubular ring gear 25 via a number of balls 26 in cooperation with a ball race 27 on the ring gear 25.
  • the reduction gearing 12 comprises two consecutive planetary gearings for which the ring gear 25 is a common member.
  • the planetary gearings comprise a sun gear 28 attached to the motor unit output shaft 29, a first set of planet wheels 30, a planet wheel carrier 31 formed integrally with a second sun gear 32, a second set of planet wheels 33, and a second planet wheel carrier 34 connected to the output spindle 14.
  • the planetary gearings are axially confined between two end washers 35, 36 supported by two lock rings 37, 38 secured to the ring gear 25.
  • the ring gear 25 is substantially tubular in shape and has an outer cylindrical surface 40 and an annular shoulder 41. See Fig 3.
  • This shoulder 41 is provided with three axially directed and equally spaced cam teeth 42 which together with three balls 43 and three corresponding cam surfaces 44 on an annular thrust element 45 form the torque transferring clutch 13.
  • These cam surfaces 44 are formed by three indentations 46 in the rear annular end surface of the thrust element 45. See Fig 3.
  • the thrust element 45 is axially movable in the housing 11 but locked against rotation by means of a ball spline connection.
  • the latter comprises three axially directed grooves 47 disposed on the outside of the thrust element 45, three slots 48 in the housing 11, and three balls 49 engaging the grooves 47 and the slots 48.
  • the balls 49 covers the slots 48, thereby preventing the balls 48 from falling out.
  • the balls 49 are inserted from the outside of the housing 11 after removal of the lock ring 51 and sliding aside the band 50.
  • the thrust element 45 has a larger diameter than the outer cylindrical surface 40 and encircles the latter. Accordingly, the thrust element 45 is located outside the ring gear 25 as is the rear end portion of a compression spring 53 which acts between the thrust element 45 and an adjustable support member 52 at the front end of the housing 11. The force developed by the spring 53 on the thrust element 45 exerts a bias load on the release clutch 13. This adjustable bias load together with the very shapes of the cam surfaces 44 and cam teeth 42 are determining for the torque level where the clutch releases.
  • the ring gear 25 is provided with three radially extending pins 55 disposes at equal angular distances from each other.
  • a ball 57 In an aperture 56 in the housing 11 there is movably supported a ball 57, and on the outside of the housing 11 there is mounted a signal producing micro switch 58.
  • a lever 59 pivoted about a stud 60 is arranged to transfer an activation movement from the ball 57 to the micro switch 58.
  • the micro switch 58 is connected to electronic control means for controlling the operation of the tool. These control means do not form any part of this invention and is, therefore, not described any further in this specification.
  • the adjustable spring support member 52 comprises an annular screw element 70 formed with an outer thread 71 for engagement with an internal thread 72 in the housing 11.
  • the screw element 70 is also formed with a concentric opening 73 provided gear teeth 74.
  • a contact member in the form of an annular washer 76 is located between the spring 53 and the screw element 70.
  • This washer 76 is provided with a radially extending dog 77 which is arranged to guidingly cooperate with an axially extending slot or groove 78 in the housing 11. Thereby, the washer 76 is locked against rotation but axially displaceable in the housing 11.
  • the washer 76 is intended to prevent torsional friction forces from being transferred from the screw element 70 to the spring 53 at rotation of the screw element 70.
  • the inner diameter of the washer 76 is smaller than the diameter of the opening 73 of the screw element 70, whereby the washer 76 forms an axial abutment means for the setting tool 80 as will be described below.
  • an opening 79 which is directed axially m parallel with the output spindle 14.
  • the opening 79 is intended to receive a setting tool 80 for engagement with and adjustment of the screw element 70.
  • the internal neck portion 17 of the end wall 16 s formed with a part-cylindrical open groove 81 extending in parallel with the output spindle 14. See Fig 5.
  • the setting tool 80 as illustrated in Fig 6, comprises a cylindrical spindle portion 82 which at its forward end is provided with external gear teeth 83 for engagement with the gear teeth 74 of the screw element 70. At its rear end, the setting tool 80 is formed with a handle 84 for manual operation. On the spindle portion 82 there is provided a scale 85 which is readable against the edge of the opening 79. The scale 85 is graduated in Nm (Newton meters) and informs of the actual setting of the spring support member 52, i.e. the actual release torque level of the clutch 13.
  • Nm Newton meters
  • the clutch setting is proportional to the axial position of the spring support 52 and, accordingly, to the penetration depth of the setting tool 80.
  • the penetration depth of the setting tool 80 is defined in relation to the end of the spring 53 by means of by the washer 76.
  • the latter forms a stop means to be engaged by the forward end of the spindle portion 82 as the tool 80 is inserted through the opening 79 and accupies its proper operating posnton.
  • the output spindle 14 is connected to a screw joint to be tightened via the chuck 15 and a tool implement attached thereto. Rotation power is supplied from the motor unit 10 via the shaft 29, and a speed reduction is obtained by the two consecutive planetary gearings before the rotation power reaches the output spindle 14.
  • the spring 53 yields to a soint where the cam teeth 42 are able to pass over the balls 43 and the ring gear 25 is free to rotate relative to the thrust element 45 and the housing 11.
  • the balls 43 remain m the indentations 46 in the thrust element 45 during the relative rotation between the ring gear 25 and the thrust element 45.
  • the ring gear 20 continues to rotate some distance before coming to stand still. If the speed is high at the release point of the clutch 13, which is the case at tightening so called stiff screw joints, the ring gear cam teeth 42 will reach and even pass over the next ball engaging position before stopping. Since the motor is shut off at the first release position of the clutch, there is no driving torque to be transferred in the second ball engaging position of the gear ring 20, also is the kinetic energy of the rotating parts substantially decreased, which means that the second clutch engagement, if any, does not cause any torque overshoot.
  • the setting tool 80 When the release torque level of the clutch 13 is to be changed, the setting tool 80 is inserted through the front opening 79, whereby an engagement is obtained between the gear teeth 83 on the setting tool 80 and the gear teeth 74 m the screw element 70.
  • the proper operating position of the setting tool 80 is defined by abutment of the forward end of the setting tool against the washer 76.
  • Rotation of the setting tool 80 causes rotation of the screw element 70, and due to the thread engagement between the screw element 70 and the housing 11 the spring support 52 will be displaced in the desired direction to change the pretension level of the spring 53.
  • the above described nutrunner is intended to be powered by an electric motor with the micro switch connected to a motor voltage controlling means of any suitable kind.
  • the invention is suitable for application on a battery powered nutrunner.
  • the motor control means is located on-board the tool.
  • the invention is not limited to a nutrunner having an electric motor, but could as well be applied on a nutrunner having a pneumatic motor.
  • the micro switch is connected to an external electric control unit by which a pressure air supply valve is controlled so as to obtain a timely shut-off of the motor at release of the clutch 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

A power nutrunner comprising a planetary reduction gearing (12) and a torque limiting release clutch (13) disposed between a ring gear (25) of the reduction gearing (12) and the tool housing (11), wherein the ring gear (25) is tubular in shape and has an outer annular shoulder (41) at its one end carrying cam teeth (42) for cooperation with a spring biased thrust element (45) via balls (43) and cam surfaces (44). The thrust element (45) encircles the ring gear (25) and is biased by a pretensioned spring (53) which is backed by an adjustable support means (52) including a rotatable screw element (70) thread connected to the housing (11) and provided with gear teeth (74) to be engaged by a setting tool (80) inserted through a front opening (79) in the housing (11).

Description

POWER NUTRUNNER WITH TORQUE RELEASECLUTCH AND A SETTING TOOL
This invention relates to a power nutrunner of the type having an adjustable torque release clutch.
In particular, the invention concerns a power nutrunner which comprises a planetary reduction gearing with a ring gear, and a torque release clutch associated with the ring gear, wherein the release clutch includes a thrust element, a cam means, and a pretensioned spring acting between a spring support means movably supported in the housing and the thrust element for exerting an adjustable release point determining bias load on the cam means.
A power nutrunner of this type is previously known through US Patent No. 4,084,487. The pretension level of the clutch biassing spring of this power tool is adjustable by a ring nut which engages an external thread on the tool housing. This ring nut is normally covered by a protective exhaust deflector sleeve, and setting of the clutch spring pretension level is rather awkward, since the protective sleeve has to be released and slid aside to get access to the ring nut. This prior art spring support design is disadvantageous also in that it adds to the outer dimensions of the nutrunner housing.
The main object of the invention is to provide a power nutrunner of the above described type, wherein the clutch spring support means is compact in design, easily accessible by means of a setting tool without dismantling any tool parts, and still well protected against unintentional displacement.
Another object of the invention is to provide a setting tool specially adapted for the adjustable clutch spring support means having the specific features of the invention.
Further objects and advantages of the invention will appear from the following specification and claims.
A preferred embodiment of the invention is below described m detail with reference to the accompanying drawing figures .
On the drawing:
Fig 1 shows a longitudinal section through the front part of a power nutrunner according to the invention.
Fig 2 shows a fractional section through the power nutrunner shown m Fig 1, but located m a different plane.
Fig 3 shows a side elevation of the release clutch included in the power nutrunner shown in Fig 1.
Fig 4 shows a front end view of the nutrunner m Fig 1.
Fig 5 shows a cross section along line V-V in Fig 1.
Fig 6 shows a side elevation of a setting tool according to the invention.
The nutrunner illustrated in the drawing figures comprises a motor unit 10 the forward end portion only of which is shown m Fig 1. Since the motor unit 10 does not form any part of the invention a detailed description thereof is not needed and is, therefore, left out of this specification.
To the motor unit 10 there is bolted a housing 11 for a reduction gearing 12 and a torque limiting release clutch 13. An output spindle 14 is connected to the motor unit 10 via the reduction gearing 12 and is provided with a chuck
15 for attachment of a screw joint engaging tool implement. At its forward end, the housing 11 is provided with an end wall 16 in which the output spindle 14 is rotationally ournalled. The end wall 16 is formed with an internal neck portion 17 for providing a proper guidance for the output spindle 14. A bushing 18 at the front end of the end wall
16 defines a central bore in the end wall 16 and forms a bearing for the output spindle 14. The bushing 18 is formed with an annular shoulder for transferring axial forces from the spindle 14 to the housing 11. A lock ring 19 and a shock absorbing resilient ring 20 are mounted on the spindle 14 for engagement with the shoulder of the bushing 18. In the opposite direction, the spindle 14 is axially locked by a lock ring 21 cooperating with the inner end of the end wall neck portion 17.
The rear end of the housing 11 comprises an end wall 22 which is secured to the motor unit 10 by means of screws 23. The end wall 22 is formed with a ball race 24 for rotational support of a tubular ring gear 25 via a number of balls 26 in cooperation with a ball race 27 on the ring gear 25.
The reduction gearing 12 comprises two consecutive planetary gearings for which the ring gear 25 is a common member. The planetary gearings comprise a sun gear 28 attached to the motor unit output shaft 29, a first set of planet wheels 30, a planet wheel carrier 31 formed integrally with a second sun gear 32, a second set of planet wheels 33, and a second planet wheel carrier 34 connected to the output spindle 14. The planetary gearings are axially confined between two end washers 35, 36 supported by two lock rings 37, 38 secured to the ring gear 25.
The ring gear 25 is substantially tubular in shape and has an outer cylindrical surface 40 and an annular shoulder 41. See Fig 3. This shoulder 41 is provided with three axially directed and equally spaced cam teeth 42 which together with three balls 43 and three corresponding cam surfaces 44 on an annular thrust element 45 form the torque transferring clutch 13. These cam surfaces 44 are formed by three indentations 46 in the rear annular end surface of the thrust element 45. See Fig 3.
The thrust element 45 is axially movable in the housing 11 but locked against rotation by means of a ball spline connection. The latter comprises three axially directed grooves 47 disposed on the outside of the thrust element 45, three slots 48 in the housing 11, and three balls 49 engaging the grooves 47 and the slots 48. A circular band
50 on the outside of the housing 11 retained by a lock ring
51 covers the slots 48, thereby preventing the balls 48 from falling out. The balls 49 are inserted from the outside of the housing 11 after removal of the lock ring 51 and sliding aside the band 50.
As illustrated in the drawing figures, the thrust element 45 has a larger diameter than the outer cylindrical surface 40 and encircles the latter. Accordingly, the thrust element 45 is located outside the ring gear 25 as is the rear end portion of a compression spring 53 which acts between the thrust element 45 and an adjustable support member 52 at the front end of the housing 11. The force developed by the spring 53 on the thrust element 45 exerts a bias load on the release clutch 13. This adjustable bias load together with the very shapes of the cam surfaces 44 and cam teeth 42 are determining for the torque level where the clutch releases.
At its rear periphery, the ring gear 25 is provided with three radially extending pins 55 disposes at equal angular distances from each other. In an aperture 56 in the housing 11 there is movably supported a ball 57, and on the outside of the housing 11 there is mounted a signal producing micro switch 58. A lever 59 pivoted about a stud 60 is arranged to transfer an activation movement from the ball 57 to the micro switch 58.
The micro switch 58 is connected to electronic control means for controlling the operation of the tool. These control means do not form any part of this invention and is, therefore, not described any further in this specification.
The adjustable spring support member 52 comprises an annular screw element 70 formed with an outer thread 71 for engagement with an internal thread 72 in the housing 11. The screw element 70 is also formed with a concentric opening 73 provided gear teeth 74.
A contact member in the form of an annular washer 76 is located between the spring 53 and the screw element 70. This washer 76 is provided with a radially extending dog 77 which is arranged to guidingly cooperate with an axially extending slot or groove 78 in the housing 11. Thereby, the washer 76 is locked against rotation but axially displaceable in the housing 11. The washer 76 is intended to prevent torsional friction forces from being transferred from the screw element 70 to the spring 53 at rotation of the screw element 70. The inner diameter of the washer 76 is smaller than the diameter of the opening 73 of the screw element 70, whereby the washer 76 forms an axial abutment means for the setting tool 80 as will be described below.
In the front eand wall 16 there is provided an opening 79 which is directed axially m parallel with the output spindle 14. The opening 79 is intended to receive a setting tool 80 for engagement with and adjustment of the screw element 70. For accomplishing a proper guidance of the setting tool 80 during clutch adjusting operations, the internal neck portion 17 of the end wall 16 s formed with a part-cylindrical open groove 81 extending in parallel with the output spindle 14. See Fig 5.
The setting tool 80, as illustrated in Fig 6, comprises a cylindrical spindle portion 82 which at its forward end is provided with external gear teeth 83 for engagement with the gear teeth 74 of the screw element 70. At its rear end, the setting tool 80 is formed with a handle 84 for manual operation. On the spindle portion 82 there is provided a scale 85 which is readable against the edge of the opening 79. The scale 85 is graduated in Nm (Newton meters) and informs of the actual setting of the spring support member 52, i.e. the actual release torque level of the clutch 13.
The clutch setting is proportional to the axial position of the spring support 52 and, accordingly, to the penetration depth of the setting tool 80. The penetration depth of the setting tool 80 is defined in relation to the end of the spring 53 by means of by the washer 76. The latter forms a stop means to be engaged by the forward end of the spindle portion 82 as the tool 80 is inserted through the opening 79 and accupies its proper operating posnton. In operation of the nutrunner, the output spindle 14 is connected to a screw joint to be tightened via the chuck 15 and a tool implement attached thereto. Rotation power is supplied from the motor unit 10 via the shaft 29, and a speed reduction is obtained by the two consecutive planetary gearings before the rotation power reaches the output spindle 14.
As the torque resistance from the screw joint increases, the reaction torque from the planetary gearings increases on the ring gear 25. This means that the ring gear 25 tends to start rotating, but is prevented from that by the clutch 13. The ring gear 25 remains stationary and the clutch continues to transfer the reaction torque from the ring gear 25 to the housing 11 as long as the bias load of the spring 53 is able to prevent the thrust element 45 from moving axially as a result of the interaction of the cam teeth 42, the balls 43 and cam surfaces 44.
As the intended release torque level of the clutch 13 is reached, however, the spring 53 yields to a soint where the cam teeth 42 are able to pass over the balls 43 and the ring gear 25 is free to rotate relative to the thrust element 45 and the housing 11. The balls 43 remain m the indentations 46 in the thrust element 45 during the relative rotation between the ring gear 25 and the thrust element 45.
At rotation of the ring gear 25, at release point of the clutch 13, one of the pins 55 comes into engagement with the ball 57 to move the latter outwardly. This activation movement is transferred via the lever 59 to the micro switch 58 which delivers an electric signal to a control means for accomplishing shut-off of the nutrunner motor. Each of the pins 55 is so located m relation to the cam teeth 42 that an activation of the micro switch 58 via the ball 57 and the lever 59 does not take place until the teeth 42 have reached or ust passed the top of the balls 43, i.e. when the torque transfer through the clutch has just ceased.
Depending on the actual rotational speed of the nutrunner motor and the other rotating parts of the tool at the shut- off point, the ring gear 20 continues to rotate some distance before coming to stand still. If the speed is high at the release point of the clutch 13, which is the case at tightening so called stiff screw joints, the ring gear cam teeth 42 will reach and even pass over the next ball engaging position before stopping. Since the motor is shut off at the first release position of the clutch, there is no driving torque to be transferred in the second ball engaging position of the gear ring 20, also is the kinetic energy of the rotating parts substantially decreased, which means that the second clutch engagement, if any, does not cause any torque overshoot.
When the release torque level of the clutch 13 is to be changed, the setting tool 80 is inserted through the front opening 79, whereby an engagement is obtained between the gear teeth 83 on the setting tool 80 and the gear teeth 74 m the screw element 70. The proper operating position of the setting tool 80 is defined by abutment of the forward end of the setting tool against the washer 76. Rotation of the setting tool 80 causes rotation of the screw element 70, and due to the thread engagement between the screw element 70 and the housing 11 the spring support 52 will be displaced in the desired direction to change the pretension level of the spring 53. The above described nutrunner is intended to be powered by an electric motor with the micro switch connected to a motor voltage controlling means of any suitable kind. In particular, the invention is suitable for application on a battery powered nutrunner. In such a case, the motor control means is located on-board the tool.
However, the invention is not limited to a nutrunner having an electric motor, but could as well be applied on a nutrunner having a pneumatic motor. In such a case, the micro switch is connected to an external electric control unit by which a pressure air supply valve is controlled so as to obtain a timely shut-off of the motor at release of the clutch 13.

Claims

1. Power nutrunner, comprising a housing (11), an output spindle (14) connectable to a screw joint to be tightened, a planetary reduction gearing (12) including a ring gear (25) rotatably supported in said housing (11), and an output torque limiting release clutch (13) associated with said ring gear (25) and including a nonrotatable but axially displaceable thrust element (45) , a cam means (42, 44) disposed between said ring gear (25) and said thrust element (45) , and a pretensioned spring
(53) acting on said thrust element (45) for exerting a release point determining bias load on said cam means (42, 44), and a spring support means (52) movably supported in said housing (11) for providing adjustability of said bias load, c h a r a r e c t e r i z e d in that said housing (11) is provided with an internal thread (72), that said spring support means (52) comprises an annular screw element (70) formed w th an external thread (71) for cooperation with said internal thread (72) in said housing (11), said screw element (70) is formed with a concentric opening (73) provided with internal gear teeth (74) , an opening (79) m said housing (11) is directed in parallel with said output spindle (14) for receiving a rotatable setting tool (80) provided with external gear teeth (83) for engagement with said internal gear teeth (74) of said screw element (70) to rotate said screw element (70) and, thereby, adjust the pretension of said spring (53) .
2. Power nutrunner according to claim 1, wherein said spring support means (52) comprises a contact member (76) located between said screw element (70) and said spring (53), and a guide means (77, 78) provided between said contact member (76) and said housing (11) for preventing rotation while pre itting axial displacement of said contact member (76) relative to said housing (11), thereby preventing torsional friction forces from being transferred from said screw element (70) to said spring (53) at rotation of said screw element (70) .
3. Power nutrunner according to claim 1 or 2, wherein said guide means (77, 78) comprises one or more radially extending dogs (77) on said contact member (76), and one or more axially extending grooves (78) in said housing (11) for guidingly receiving said dog or dogs (77) .
4. Power nutrunner according to anyone of claims 1 - 3, wherein said housing (11) has a front end wall (16) formed with a central bore (18) for penetration of said output spindle (14), and said opening (79) extends through said end wall (16) in parallel with said central bore (18) .
5. Power nutrunner according to anyone of claims 1 -
4, wherein said end wall (16) comprises a concentric inwardly extending neck portion (17), said neck portion (17) is formed with an open axially directed part- cylindrical groove (81) located in alignment with said opening (79) for guidance of said setting tool (80) as the latter is inserted through said opening (79) .
6. Power nutrunner according to anyone of claims 1 -
5, wherein said contact member (76) forms an insertion depth limiting means for said setting tool (80) .
7. Setting tool intended for a power nutrunner as recited in claims 1 - 6, comprising an elongate spindle portion (82) with a forward end for introduction through said opening (79), and a handle means (84) intended for manual rotation of said spindle portion (82) , wherein said forward end of said spindle portion (82) is formed with external gear teeth (83) and arranged to endwise abut against said contact member (76) when said spindle portion (82) occupies its proper operating position.
8. Setting tool according to claim 7, wherein said spindle portion (82) is provided with an introduction depth indicating scale (85) readable against the edge of said opening (79) , wherein the variations in the introduction depth of said spindle portion (82) is proportional to variations in the pretension level of said spring (53) as well as to the release torque level of said clutch (13)
PCT/SE1997/000409 1996-03-11 1997-03-11 Power nutrunner with torque release clutch and a setting tool WO1997033722A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP97908631A EP0886560B1 (en) 1996-03-11 1997-03-11 Power nutrunner with torque release clutch and a setting tool
DE69718297T DE69718297T2 (en) 1996-03-11 1997-03-11 DRIVEN WRENCH WITH TORQUE CLUTCH AND ADJUSTING TOOL
JP53251397A JP4041539B2 (en) 1996-03-11 1997-03-11 Power nutrunner with torque release clutch and adjustment tool
US09/142,616 US6076438A (en) 1996-03-11 1997-03-11 Power nutrunner with torque release clutch and a setting tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9600934-5 1996-03-11
SE9600934A SE9600934D0 (en) 1996-03-11 1996-03-11 Power nutrunner with torque release xclutch

Publications (1)

Publication Number Publication Date
WO1997033722A1 true WO1997033722A1 (en) 1997-09-18

Family

ID=20401743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000409 WO1997033722A1 (en) 1996-03-11 1997-03-11 Power nutrunner with torque release clutch and a setting tool

Country Status (6)

Country Link
US (1) US6076438A (en)
EP (1) EP0886560B1 (en)
JP (1) JP4041539B2 (en)
DE (1) DE69718297T2 (en)
SE (1) SE9600934D0 (en)
WO (1) WO1997033722A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002321166A (en) * 2001-04-25 2002-11-05 Katsuyuki Totsu Torque control method for power rotary tool

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6345436B1 (en) * 1999-06-22 2002-02-12 Ernest Richardson Codrington Combination torque tool and method of adjusting valves and injectors
US7101300B2 (en) * 2001-01-23 2006-09-05 Black & Decker Inc. Multispeed power tool transmission
US6676557B2 (en) * 2001-01-23 2004-01-13 Black & Decker Inc. First stage clutch
DE10127821C5 (en) * 2001-06-07 2005-05-12 Tool Express-Service Schraubertechnik Gmbh Arrangement for operating an electric screwdriver
DE10161356B4 (en) * 2001-12-13 2013-03-07 Hilti Aktiengesellschaft screwdriving
JP2003236767A (en) * 2002-02-19 2003-08-26 Lobtex Co Ltd Working mechanism, working mechanism attachment, and working tool
JP4320461B2 (en) * 2003-02-04 2009-08-26 Ｓｍｃ株式会社 Automatic reduction ratio switching device
EP1524083A1 (en) * 2003-10-13 2005-04-20 A & M Electric Tools GmbH Device for setting the torque limit in a hand held machine-tool
EP1690638A1 (en) * 2005-02-09 2006-08-16 BLACK & DECKER INC. Power tool gear-train and torque overload clutch therefor
US7314097B2 (en) * 2005-02-24 2008-01-01 Black & Decker Inc. Hammer drill with a mode changeover mechanism
SE529575C2 (en) * 2005-11-17 2007-09-25 Atlas Copco Tools Ab Torque dependent release clutch for a screwdriver
US7980324B2 (en) 2006-02-03 2011-07-19 Black & Decker Inc. Housing and gearbox for drill or driver
US7494437B2 (en) * 2007-01-04 2009-02-24 Ting Kuang Chen Impact power tool
US7455615B2 (en) * 2007-01-04 2008-11-25 Hsin-Chih Chung Lee Transmission mechanism
EP2030710B1 (en) * 2007-08-29 2014-04-23 Positec Power Tools (Suzhou) Co., Ltd. Power tool and control system for a power tool
US7793560B2 (en) * 2007-09-11 2010-09-14 Black & Decker Inc. Transmission and variable radially expanding spring clutch assembly
US20090314143A1 (en) * 2008-06-23 2009-12-24 Ho-Tien Chen Screw band locking device
US8851201B2 (en) * 2008-08-06 2014-10-07 Milwaukee Electric Tool Corporation Precision torque tool
US8251158B2 (en) 2008-11-08 2012-08-28 Black & Decker Inc. Multi-speed power tool transmission with alternative ring gear configuration
DE102009027951A1 (en) * 2009-07-23 2011-01-27 Robert Bosch Gmbh Hand tool machine, in particular battery-operated electric hand tool machine
US8540580B2 (en) 2009-08-12 2013-09-24 Black & Decker Inc. Tool bit or tool holder for power tool
DE102009054931A1 (en) * 2009-12-18 2011-06-22 Robert Bosch GmbH, 70469 Hand-held power tool with a torque coupling
EP2635410B1 (en) 2010-11-04 2016-10-12 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch
JP2012218089A (en) * 2011-04-05 2012-11-12 Makita Corp Power tool
JP5628079B2 (en) * 2011-04-05 2014-11-19 株式会社マキタ Vibration driver drill
US8956260B2 (en) * 2013-01-31 2015-02-17 Hsiu-Man Yu Chen Pneumatic motor of pneumatic packing machine
JP2014172164A (en) * 2013-03-13 2014-09-22 Panasonic Corp Electric power tool
US10683920B2 (en) * 2018-10-23 2020-06-16 Atieva, Inc. Torque limiter for use with a dual planetary/integrated differential drive train

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087540B (en) * 1955-01-19 1960-08-18 Licentia Gmbh Power tool with clutch that can be adjusted to any torque within certain limits
US4084487A (en) * 1975-12-02 1978-04-18 Chicago Pneumatic Tool Company Pulse motor in a nut runner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634321A (en) * 1985-07-16 1987-01-06 Mcclelland Thomas W Chuck key and extension member for a chuck key
JPS6426166U (en) * 1987-08-05 1989-02-14
US5076120A (en) * 1990-10-31 1991-12-31 Lin Pi Chu Electric wrench

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087540B (en) * 1955-01-19 1960-08-18 Licentia Gmbh Power tool with clutch that can be adjusted to any torque within certain limits
US4084487A (en) * 1975-12-02 1978-04-18 Chicago Pneumatic Tool Company Pulse motor in a nut runner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002321166A (en) * 2001-04-25 2002-11-05 Katsuyuki Totsu Torque control method for power rotary tool

Also Published As

Publication number Publication date
US6076438A (en) 2000-06-20
JP4041539B2 (en) 2008-01-30
EP0886560A1 (en) 1998-12-30
SE9600934D0 (en) 1996-03-11
DE69718297T2 (en) 2003-11-06
EP0886560B1 (en) 2003-01-08
DE69718297D1 (en) 2003-02-13
JP2000506448A (en) 2000-05-30

Similar Documents

Publication Publication Date Title
US6076438A (en) Power nutrunner with torque release clutch and a setting tool
EP0886559B1 (en) Power nutrunner
US5356350A (en) Motor-driven screwdriver with variable torque setting for equal torques regardless or countertorques by fasteners
US7481608B2 (en) Rotatable chuck
US6142243A (en) Hand-held power tool, in particular drill screw driver
EP2216114B1 (en) Power tool chuck assembly with hammer mechanism
US4071092A (en) Pneumatic screwdriver with torque responsive shut-off
US4630512A (en) Adjustable motor-operated screw driving device
EP0525911B1 (en) Transmission for electrically driven tool
US5346022A (en) Torque limiting device for air impact tool
US5778989A (en) Screw driving tool
US9415448B2 (en) Power drill with adjustable torque
US4231270A (en) Electrically driven fastening appliance
US20070068693A1 (en) Combination drill
CA1050308A (en) Torque controller shutoff mechanism
JPH0386482A (en) Motor-operated screw driving device
US5709275A (en) Screw-driving tool
JPS58165969A (en) Blocking type screw driver
GB2274416A (en) Percussion screwdriver
US5083990A (en) Two-speed power transmission for a power tool
US3220526A (en) One shot clutch
US3276524A (en) Drive adapter for torque responsive control
US6415490B1 (en) Portable power tool for mounting via a press fit a machine part onto a shaft
WO1999016585A1 (en) Power nutrunner with shut-off
KR100556041B1 (en) Electric driver

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 09142616

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 1997908631

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1997908631

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1997908631

Country of ref document: EP