US3752278A - Improved power operated wrench or screwdriver - Google Patents

Improved power operated wrench or screwdriver Download PDF

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Publication number
US3752278A
US3752278A US00117655A US3752278DA US3752278A US 3752278 A US3752278 A US 3752278A US 00117655 A US00117655 A US 00117655A US 3752278D A US3752278D A US 3752278DA US 3752278 A US3752278 A US 3752278A
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US
United States
Prior art keywords
torque
clutch
sensitive portion
tool
dogs
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00117655A
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English (en)
Inventor
R States
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Compressors and Tools Ltd
Original Assignee
Desoutter Brothers Ltd
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 Desoutter Brothers Ltd filed Critical Desoutter Brothers Ltd
Application granted granted Critical
Publication of US3752278A publication Critical patent/US3752278A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers

Definitions

  • the invention relates to a power operated wrench or screwdriver, and in particular to a hand held wrench or screwdriver having a pneumatic motor, a reduction gear driven by the motor, an output shaft for the reduction gear, a head which supports a tool for engaging a fastener which is to be rotated, and a clutch which is driven by the output shaft of the gear and which is adapted to drive the tool.
  • the clutch is formed of two portions, a torquesensitive portion and a non-torque-sensitive portion, the one is driven by the other when a torque delivered by a tool does not exceed a predetermined value.
  • the torque-sensitive portion has two main members, a driving member and a driven member. These members are mounted upon a tubular member co-axially with the output shaft of the gear, one of which is splined thereto and is movable longitudinally of the tubular member against the action of a helical spring positioned co-axially of the tubular member.
  • the driving member and driven member are provided with interengaging members located between them which causes a relative longitudinal movement of the members when a torque delivered by the tool exceeds the predetermined value. This relative longitudinal movement occurs without disengagement of the members.
  • the non-torque-sensitive clutch portion is mounted coaxially of the output shaft of the gear.
  • Circumferentially spaced dogs located on the non-torque-sensitive clutch portion engage circumferentially spaced dogs on one of the two members of the torque-sensitive clutch portion when the torque delivered by the tool is less than a predetermined value.
  • the spaced dogs on the non-torque-sensitive clutch portion disengage from the spaced dogs on the torque-sensitive clutch portion and ride over one another as the two members of the torque sensitive clutch portion move longitudinally relative to one another.
  • FIG. 1 is a longitudinal section of a first embodiment
  • FIG. 2 is a part section of a portion 4 of FIG. 1 where the drive has been interrupted
  • FIG. 3 is a part longitudinal section of the second embodiment, while,
  • FIG. 4 is a cross-section on the line 4-4 of FIG. 3.
  • Pneumatic hand held screwdriver shown in FIGS. 1 and 2 comprises a control valve part 1, a motor part 2, a reduction gear portion 3, a clutch part 4, and a head part 5,
  • the arrangement of the component parts shown in the parts I-3 and 5 are by way of example only and may be modified as is desired seeing that the invention resides principally in the arrangement of the component parts of the clutch part 4.
  • FIG. 1 The section of FIG. 1 is divided longitudinally so that the upper half represents the position of the screwdriver and clutch part 4 in the rest position, while the lower half represents these elements while the screwdriver is being driven by way of the clutch part 4.
  • Part FIG. 2 represents the clutch 4 after interruption of the drive when a predetermined value of torque has been obtained.
  • the drive from the motor 14 passes to the two stage reduction gear 15 by way of the hollow shaft 16 and emerges by way of the hollow shaft 17 in the clutch part 4.
  • the clutch comprises a torque-sensitive portion and a non-torque-sensitive portion and comprises a tubular member 18 which is splined upon the shaft 17 by splines 19 for longitudinal movement to the left of FIG. 1, by reason of pressure upon the screwdriver 8, as shown in the lower part of the figure.
  • This movement is caused by the movement of a first non-torquesensitive clutch portion member 20, part of which is formed as a holder for the screwdriver and part of which is formed at its periphery into closely spaced dogs 21.
  • the helical spring 22 urges the clutch member 20 in the direction of the head of the tool.
  • FIG. 2 shows two positions of a torque sensitive clutch portion.
  • the upper half of the drawing is when the torque sensitive clutch portion is displaced.
  • the lower half of the drawing shows a position when the torque sensitive clutch portion is fully engaged, but still rotating owing to residual inertia. This rotation does not allow union between members 21 and 36, owing to the relative rotational movement therebetween
  • a second non-torque sensitive clutch portion member 23 is supported for free rotation by the balls 24 on the tubular member 18, and is provided with closely spaced dogs 25 around the periphery, which match the dogs 21 on the member 20.
  • the clutch member 23 is also provided on the side with dogs 25a having ramped load taking surfaces which constitutes the driven member of a torque sensitive dog clutch portion of the kind previously referred to.
  • the driving ramped dogs 25b of the torque sensitive clutch portion are formed upon a ring like member 26 splined upon the tubular member 18 for longitudinal movement by the spline 27 and against the action of the spring 28.
  • the clutch member 26 is connected to the abutment member 22a by a radial pin 22b passing through bores in both members and free to move longitudinally in slots provided in the wall of the tubular member 18. Consequently, the clutch member 26 and the abutment member 22a move together when the clutch member 26 moves under the action of torque and the abutment member 22a is moved to the left and move the rods 9 and 10 a second step under the action of the torque sensitive clutch.
  • One end of the tubular member 18 is provided with a screw thread upon which is mounted the abutment ring 29 having a bevel gear 30 thereon.
  • Adjacent the abutment ring 29 is a further ring like member 31 which is slidable longitudinally over thethread on the tubular member 18, and which is prevented from rotation by an inwardly directed tooth 32 which enters the spline 27.
  • the ring like member 31 is provided with a bore 33 into which may be inserted a key having a bevel gear thereon, as shown in FIG. 3, which engages the bevel gear 30' on the abutment ring 29 and by the latter may .be rotated on the tubular member 18' to adjust the pressure provided by the spring 28'.
  • a thrust washer 34 Sandwiched between the spring 28 and the ring like member 26 is a thrust washer 34 which forms one side of a groove containing the balls 35 which support a ho]- low cylindrical third non-torque sensitive portion member 36 having long dogs 37, which are capable of bridging between the periphical dogs on the members 20 and 23, as shown in FIG. 1, in both situations.
  • the third clutch member 36 is urged to engage by the light spring 38.
  • FIGS. 3 and 4 A tool without such a valve 13 is shown in FIGS. 3 and 4 which is of the kind having a pistol grip, and only the front end of the tool is shown.
  • the action of the torque sensitive clutch portion and the non-torque sensitive clutch portion are similar to that shown in the embodiment of FIGS. 1 and 2, but differ in that the clutch portions are the opposite way round.
  • the member 20' is the driving member of the non-torque sensitive clutch portion and is driven by splines on the driving shaft 17'.
  • the torque sensitive clutch portion is mounted for longitudinal movement in splines 27 and is urged to the left of the figure to engage the member 20' by the action of the spring 28'.
  • FIG. 4 clearly shows the shape of the ramp dogs of the torque sensitive clutch and their relationship with one another, both clutch members having dogs of the same shape. It is to be understood that the above description is by way of example only, and that details for carrying the invention into effect may be varied without departing from the scope of the invention.
  • a power operated wrench or screwdriver comprising a motor, a reduction gear driven by the motor, an output shaft for the reduction gear, a head providing support for a tool for engaging a fastener to be rotated, and a clutch driven by the output shaft of the gear and having means for driving said tool, the clutch being formed in two portions, a torque-sensitive portion and a nomtorque-sensitive portion, the one being driven by the other when the torque delivered by the tool does not exceed a predetermined value, the torque-sensitive portion comprising two main members, a driving member and a driven member, mounted upon a tubular member coaxial with the output shaft of the gear, and one of which is splined thereto and is movable longitudinally of the tubular member against the action of a first spring positioned upon tubular member, said driv ing member and driven member of the torque-sensitive portion being provided with inter-engaging members therebetween which cause longitudinal movement of said splined member thereof when the torque delivered by the tool exceeds said predetermined value without disengagement

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Mechanically-Actuated Valves (AREA)
US00117655A 1970-12-22 1971-02-22 Improved power operated wrench or screwdriver Expired - Lifetime US3752278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6081570 1970-12-22

Publications (1)

Publication Number Publication Date
US3752278A true US3752278A (en) 1973-08-14

Family

ID=10486134

Family Applications (1)

Application Number Title Priority Date Filing Date
US00117655A Expired - Lifetime US3752278A (en) 1970-12-22 1971-02-22 Improved power operated wrench or screwdriver

Country Status (4)

Country Link
US (1) US3752278A (ko)
DE (1) DE2110112C3 (ko)
FR (1) FR2083137A5 (ko)
GB (1) GB1289056A (ko)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064948A (en) * 1975-03-18 1977-12-27 Atlas Copco Aktiebolag Power wrench
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4641551A (en) * 1983-12-27 1987-02-10 Hall Surgical, Division Of Zimmer, Inc. Apparatus for translating rotational motion and torque
US5060772A (en) * 1988-08-17 1991-10-29 Cooper Industries, Inc. Power-operated tool
US5094330A (en) * 1991-07-19 1992-03-10 Lee Song Ming Power transmission mechanism with automatic clutch means
US5551927A (en) * 1993-07-23 1996-09-03 Ims Morat Sohne Gmbh Gear mechanism for accumulator driven electric drill or electric screwdriver
US5690577A (en) * 1994-07-25 1997-11-25 Ims Morat Sohne Gmbh Gear Mechanism
US6533093B2 (en) * 2001-04-19 2003-03-18 Power Network Industry Co., Ltd. Torque adjusting device for a drill
US6745882B2 (en) 2001-12-27 2004-06-08 The Timken Company Locking clutch
US6848998B2 (en) 2002-12-12 2005-02-01 Brian K. Bosk Wedge clutch assembly
US20050139445A1 (en) * 2002-12-12 2005-06-30 Bosk Brian K. Wedge clutch assembly
US20060135267A1 (en) * 2002-12-12 2006-06-22 Bosk Brian K Wedge clutch assembly
US20090038904A1 (en) * 2002-12-12 2009-02-12 Bosk Brian K Wedge clutch assembly
US20090126960A1 (en) * 2006-05-09 2009-05-21 Atlas Copco Tools Ab Portable Power Tool with Drive Shaft Lock Means
WO2009126646A1 (en) * 2008-04-07 2009-10-15 Innophos, Inc. Air blown asphalt including polyphosphoric acid
US20110214960A1 (en) * 2002-12-12 2011-09-08 Bosk Brian K Wedge clutch assembly
US9289886B2 (en) 2010-11-04 2016-03-22 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209395A1 (de) * 1982-03-15 1983-09-22 Robert Bosch Gmbh, 7000 Stuttgart Abschaltschrauber mit einer laengsverschiebbaren schrauberspindel
DE3801972A1 (de) * 1988-01-23 1989-08-03 Wagner Paul Heinz Kraftschrauber
GB2277562B (en) * 1993-04-27 1997-01-29 Tai Her Yang A system of planetary gears
US5505676A (en) * 1994-01-25 1996-04-09 The Stanley Works Clutch torque control

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881888A (en) * 1954-01-26 1959-04-14 Chicago Pneumatic Tool Co Torque control clutch
US2884103A (en) * 1954-04-08 1959-04-28 Chicago Pneumatic Tool Co Predetermined torque release mechanism
US3091316A (en) * 1960-09-16 1963-05-28 Sperry Rand Corp Overridable clutch mechanism
US3187860A (en) * 1963-01-24 1965-06-08 Chicago Pneumatic Tool Co Portable nut runner having automatic speed change and automatic shut-off
US3237742A (en) * 1964-06-19 1966-03-01 Ingersoll Rand Co Torque releasing clutch mechanism with power cutoff
US3288258A (en) * 1964-08-24 1966-11-29 Ingersoll Rand Co Torque releasing clutch mechanism
US3289715A (en) * 1964-03-19 1966-12-06 Aro Corp Automatic shut-off tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881888A (en) * 1954-01-26 1959-04-14 Chicago Pneumatic Tool Co Torque control clutch
US2884103A (en) * 1954-04-08 1959-04-28 Chicago Pneumatic Tool Co Predetermined torque release mechanism
US3091316A (en) * 1960-09-16 1963-05-28 Sperry Rand Corp Overridable clutch mechanism
US3187860A (en) * 1963-01-24 1965-06-08 Chicago Pneumatic Tool Co Portable nut runner having automatic speed change and automatic shut-off
US3289715A (en) * 1964-03-19 1966-12-06 Aro Corp Automatic shut-off tool
US3237742A (en) * 1964-06-19 1966-03-01 Ingersoll Rand Co Torque releasing clutch mechanism with power cutoff
US3288258A (en) * 1964-08-24 1966-11-29 Ingersoll Rand Co Torque releasing clutch mechanism

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064948A (en) * 1975-03-18 1977-12-27 Atlas Copco Aktiebolag Power wrench
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4641551A (en) * 1983-12-27 1987-02-10 Hall Surgical, Division Of Zimmer, Inc. Apparatus for translating rotational motion and torque
US5060772A (en) * 1988-08-17 1991-10-29 Cooper Industries, Inc. Power-operated tool
US5094330A (en) * 1991-07-19 1992-03-10 Lee Song Ming Power transmission mechanism with automatic clutch means
US5551927A (en) * 1993-07-23 1996-09-03 Ims Morat Sohne Gmbh Gear mechanism for accumulator driven electric drill or electric screwdriver
US5690577A (en) * 1994-07-25 1997-11-25 Ims Morat Sohne Gmbh Gear Mechanism
US6533093B2 (en) * 2001-04-19 2003-03-18 Power Network Industry Co., Ltd. Torque adjusting device for a drill
US6745882B2 (en) 2001-12-27 2004-06-08 The Timken Company Locking clutch
US6848998B2 (en) 2002-12-12 2005-02-01 Brian K. Bosk Wedge clutch assembly
US20050139445A1 (en) * 2002-12-12 2005-06-30 Bosk Brian K. Wedge clutch assembly
US20060135267A1 (en) * 2002-12-12 2006-06-22 Bosk Brian K Wedge clutch assembly
US20090038904A1 (en) * 2002-12-12 2009-02-12 Bosk Brian K Wedge clutch assembly
US20110214960A1 (en) * 2002-12-12 2011-09-08 Bosk Brian K Wedge clutch assembly
US8439763B2 (en) 2002-12-12 2013-05-14 Brian K. Bosk Wedge clutch assembly
US20090126960A1 (en) * 2006-05-09 2009-05-21 Atlas Copco Tools Ab Portable Power Tool with Drive Shaft Lock Means
WO2009126646A1 (en) * 2008-04-07 2009-10-15 Innophos, Inc. Air blown asphalt including polyphosphoric acid
EP2262873A4 (en) * 2008-04-07 2013-08-07 Innophos Inc AIR-SUPPLIED ASPHALT COMPRISING POLYPHOSPHORIC ACID
US9289886B2 (en) 2010-11-04 2016-03-22 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch

Also Published As

Publication number Publication date
DE2110112B2 (de) 1974-06-12
DE2110112A1 (de) 1972-07-13
GB1289056A (ko) 1972-09-13
FR2083137A5 (ko) 1971-12-10
DE2110112C3 (de) 1975-01-30

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