GB1332275A - Low torque automatic screwdriver - Google Patents

Low torque automatic screwdriver

Info

Publication number
GB1332275A
GB1332275A GB2470272A GB2470272A GB1332275A GB 1332275 A GB1332275 A GB 1332275A GB 2470272 A GB2470272 A GB 2470272A GB 2470272 A GB2470272 A GB 2470272A GB 1332275 A GB1332275 A GB 1332275A
Authority
GB
United Kingdom
Prior art keywords
gear
valve
clutch
rod
spring
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
Application number
GB2470272A
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.)
Dresser Industries Inc
Original Assignee
Dresser Industries Inc
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 Dresser Industries Inc filed Critical Dresser Industries Inc
Publication of GB1332275A publication Critical patent/GB1332275A/en
Expired legal-status Critical Current

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

Abstract

1332275 Powered screwdrivers DRESSER INDUSTRIES Inc 25 May 1972 [9 June 1971] 24702/72 Heading B3N A powered screwdriver comprises in combination an air motor, a drive end, a clutch 19 to disconnect drive at a predetermined torque and disconnect means operative concomitantly and in parallel with uncoupling of said clutch to shut-off the air supply, said disconnect means including a shut-off valve 31 in an air inlet, a slidable throttle rod 40 for operating said valve, gear means 91 movably radially relative to the axis of tool rotation between a first position effectively locking said throttle rod against movement in a direction for closing said valve, and a second position enabling said rod movement for closing said valve, and cam means operatively associated with said drive end for shifting said gear means from said first to said second position. In operation guide piece 22 engages a screw and is forced inwardly. Further pressing engagement on the bit 14 forces drive shaft 17, clutch 19, and throttle valve rod 40 rearwardly so that valve 31 is opened to allow air to the motor. The clutch has a driving part 63 connected to output shaft 17 by flange 58 and balls 77. At a predetermined torque the balls run up cams 74 and force cage retainer 83 against the action of spring 84. Thus the clutch is disengaged. For undoing screws the cam rise is steeper. Gear 91 is normally biased by spring 98 such that its centre of gravity is on centre line 100 which is offset from centre line 101. Thus during rotation centrifugal forces on the gear augment the force applied by spring 98. The gear acts on face 91 of throttle rod portion 41 to prevent valve 31 being forced to a closed position by air pressure acting thereon. When the predetermined torque is reached output shaft 17 stops but the driving clutch part and the gear continue to rotate. The inner end portion of the output shaft that engages the gear is square, and on relative rotation between the shaft and the gear causes the corners of the shaft to act as cams and move the gear against the action of spring 98. This movement aligns a hole 94 with throttle rod portion 41. Air pressure moves the rod to the left causing valve 31 to close and shutoff the motor.
GB2470272A 1971-06-09 1972-05-25 Low torque automatic screwdriver Expired GB1332275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15132971A 1971-06-09 1971-06-09

Publications (1)

Publication Number Publication Date
GB1332275A true GB1332275A (en) 1973-10-03

Family

ID=22538265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2470272A Expired GB1332275A (en) 1971-06-09 1972-05-25 Low torque automatic screwdriver

Country Status (8)

Country Link
US (1) US3766990A (en)
JP (1) JPS5335320B1 (en)
CA (1) CA955086A (en)
DE (1) DE2228116C2 (en)
FR (1) FR2141208A5 (en)
GB (1) GB1332275A (en)
IT (1) IT958255B (en)
SE (1) SE398059C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125325A (en) * 1982-07-12 1984-03-07 Stanley Works Power tool

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918533A (en) * 1972-07-26 1975-11-11 Weber Schraubautomaten Screwdriver
US4114699A (en) * 1976-01-22 1978-09-19 Licentia Patent-Verwaltungs-Gmbh Pneumatic rotary hammer device
US4078618A (en) * 1976-03-15 1978-03-14 Gardner-Denver Company Torque controller shutoff mechanism
US4071092A (en) * 1977-03-09 1978-01-31 Chicago Pneumatic Tool Company Pneumatic screwdriver with torque responsive shut-off
US4154308A (en) * 1977-10-25 1979-05-15 Dresser Industries, Inc. Low torque automatic screwdriver
JPS5549537A (en) * 1978-10-04 1980-04-10 Nissan Motor Co Ltd Fuel shut-off device
US4318334A (en) * 1980-03-20 1982-03-09 Carrier Corporation Torque control for a fluid operated motor
US4576270A (en) * 1983-02-28 1986-03-18 The Aro Corporation Torque control and fluid shutoff mechanism for a fluid operated tool
GB2149465B (en) * 1983-11-15 1987-09-09 Desoutter Ltd A pneumatically operated power tool
JPS60247033A (en) * 1984-05-21 1985-12-06 Japan Electronic Control Syst Co Ltd Electronically controlled fuel injection device in internal-combustion engine
US4875528A (en) * 1989-02-13 1989-10-24 Allen-Bradley Company, Inc. Torque control actuator
SE8901072L (en) * 1989-03-28 1990-09-29 Atlas Copco Tools Ab ENGINE DRIVER SCREW
US4951756A (en) * 1989-05-16 1990-08-28 Chicago Pneumatic Tool Company Torque control screwdriver
US5054588A (en) * 1990-08-31 1991-10-08 The Aro Corporation Torque sensing automatic shut-off and reset clutch for screwdrivers, nutsetters and the like
US5156244A (en) * 1990-08-31 1992-10-20 The Aro Corporation Torque sensing automatic shut-off and reset clutch for screwdrivers, nutsetters and the like
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
US6196772B1 (en) 1999-06-18 2001-03-06 Cooper Technologies Company Positive feed tool having a clutch
US20120080285A1 (en) * 2010-10-01 2012-04-05 Ho-Tien Chen Clutch device for a screw driver
EP3636389A1 (en) 2012-02-03 2020-04-15 Milwaukee Electric Tool Corporation Rotary hammer
US9718159B2 (en) 2013-11-04 2017-08-01 Seagate Technology Llc Adaptive fastener access tool
CN108177115B (en) * 2018-03-20 2024-02-06 武汉多可特医疗器械有限公司 Self-clamping screw electric screwdriver

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986052A (en) * 1958-10-27 1961-05-30 Reed Roller Bit Co Predetermined torque responsive hand tool
US3082742A (en) * 1960-05-09 1963-03-26 Ingersoll Rand Co Torque tool control
DE1503022A1 (en) * 1962-03-03 1969-10-30 Reed Roller Bit Co Tool operated by a pressure medium
US3275116A (en) * 1964-10-12 1966-09-27 Airetool Mfg Company Air powered tool with overload cutoff
US3354754A (en) * 1965-11-16 1967-11-28 Chicago Pneumatic Tool Co Nut-runner with reverse rotation brake
US3477521A (en) * 1967-10-05 1969-11-11 Aro Corp Automatic power tool
SE332605B (en) * 1969-06-27 1971-02-08 Atlas Copco Ab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125325A (en) * 1982-07-12 1984-03-07 Stanley Works Power tool

Also Published As

Publication number Publication date
SE398059C (en) 1979-04-19
IT958255B (en) 1973-10-20
CA955086A (en) 1974-09-24
US3766990A (en) 1973-10-23
DE2228116C2 (en) 1983-10-13
FR2141208A5 (en) 1973-01-19
SE398059B (en) 1977-12-05
JPS5335320B1 (en) 1978-09-26
DE2228116A1 (en) 1972-12-28

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee