EP0532289A1 - Moyens pour exercer un couple sur un moyen de serrage - Google Patents

Moyens pour exercer un couple sur un moyen de serrage Download PDF

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Publication number
EP0532289A1
EP0532289A1 EP92308171A EP92308171A EP0532289A1 EP 0532289 A1 EP0532289 A1 EP 0532289A1 EP 92308171 A EP92308171 A EP 92308171A EP 92308171 A EP92308171 A EP 92308171A EP 0532289 A1 EP0532289 A1 EP 0532289A1
Authority
EP
European Patent Office
Prior art keywords
movable
lost
biasing means
fastener
recess
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.)
Withdrawn
Application number
EP92308171A
Other languages
German (de)
English (en)
Inventor
David Geoffrey Allen
Terence Clifford 2 Southview Cottages Bullen
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.)
MHH ENGINEERING CO Ltd
Original Assignee
MHH ENGINEERING CO 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
Priority claimed from GB919119313A external-priority patent/GB9119313D0/en
Priority claimed from GB919119890A external-priority patent/GB9119890D0/en
Application filed by MHH ENGINEERING CO Ltd filed Critical MHH ENGINEERING CO Ltd
Publication of EP0532289A1 publication Critical patent/EP0532289A1/fr
Withdrawn legal-status Critical Current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
    • B25B23/141—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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

  • the invention relates to a device for applying torque to a fastener such as a screw or bolt.
  • Conventional screw-drivers for applying a pre-determined torque level to a fastener generally comprises a coupling mechanism which includes one or more spherical balls which are located in close-fitting recesses and which are biased against a cam by means of a spring bias device.
  • a coupling mechanism which includes one or more spherical balls which are located in close-fitting recesses and which are biased against a cam by means of a spring bias device.
  • a device for applying torque to a fastener comprises a first member adapted to be coupled to a fastener and a second member coupled to the first member by a releasable coupling which transmits torque applied to the second member to the first member, and whereby the releasable coupling is adapted to de-couple the second member from the first member when the torque applied to the second member exceeds a predetermined magnitude, and the releasable coupling comprising a lost motion device to couple the second member to the first member.
  • the lost motion device comprises a lost motion member and a movable member mounted on the lost motion member which is movable between an engaged position in which the second member is coupled to the first member and a disengaged position in which the second member is de-coupled from the first member.
  • the lost motion member includes a recess and the dimensions of the movable member and recess are chosen to permit relative movement of the movable member in the recess, preferably in both a radial direction and a circumferential direction.
  • the movable member comprises a spherical shaped member and the recess may be radially and circumferentially extending slots in which the spherical member moves.
  • the releasable coupling further comprises biasing means and a counter-biasing means and the movable member is biased into engagement with the counter biasing means by the biasing means and typically, the biasing means may be adjustable in order to vary the biasing force applied to the movable member.
  • the counter biasing means comprises a cam device.
  • the movable member and the lost motion member move relative to the counter-biasing means.
  • the counter-biasing means is mounted on the second member and the lost motion member and movable member are mounted on the first member.
  • the first member may comprise a shaft of the screw-driver and the second member may comprise a handle.
  • the releasable coupling comprises three recesses in the lost motion member and three corresponding movable members.
  • the lost motion member and the movable members are mounted on the first member and the counter biasing means is mounted on the second member.
  • the counter biasing means comprises a cam device, then this is in the form of a cam ring mounted on the second member.
  • the biasing means comprises a helical spring and may further comprise a spherical member which transmits the biasing force from the spring to the movable member.
  • the central axis of the spring is parallel to the central axis of the shaft of the screw-driver and typically, is coincident with the central axis of the shaft.
  • loss motion device means a device which permits a limited movement of one member relative to the other member, without a corresponding movement of the other member.
  • Fig 1 shows a screw-driver 20 which comprises a shaft 1 which is fixed to a spring housing 19 at one end. At the other end of the shaft 1 is 1 / 4 inch square drive 21 which has a blind bore 22 in which is mounted a steel ball 14 with a diameter of approximately 1 / 8 inch (3.175mm) and a spring 10 to bias the steel ball 14 towards the position shown in Fig 1. The ball 14 is retained by light deformation of the mouth of the bore 22.
  • an adjusting screw 4 which is rotationally locked to the spring housing 19 by means of a nylon ball 17 which has a diameter of approximately 3/32 inch (2.38mm).
  • a spring 6 is located within the spring housing 19 and abuts against the inner side of the adjusting screw 4 at one end and against a spring pad 16 at its other end.
  • the spring pad 16 rests on a steel ball 12 of approximately 1 / 2 inch (12.7mm) diameter which transmits the biasing force from the spring 6 to three steel balls 13 (only one shown) which are mounted in apertures 23 in the spring housing 19.
  • Each of the steel balls 13 has a diameter of approximately 7/32 inch (5.56mm).
  • the spring housing 19 is mounted within a handle assembly which comprises a handle 3, a cam ring 2 mounted at the lower end of the handle 3.
  • the handle 3 has an aperture 24 in its upper end which is screened by a threaded plug 9.
  • the shaft 1 and spring housing 19 are rotationally mounted on the handle assembly by means of a radial bearing 15 mounted between the cam ring 2 and shaft 1 which is held in position by a retaining ring 11, and a thrust washer assembly which comprises two outer thrust washers 7 and a central thrust washer 8 which are located between the upper end of the spring housing 19 and the inside of the handle 3.
  • the thrust washer assembly has a central aperture 25 which permits access to engagement recesses 26 in the adjusting screw 4.
  • Fig 3 is a cross-sectional view through the spring housing 19 along the line AA in Fig 1, with the other components removed.
  • FIG 3 there are 3 apertures 23 equi-spaced circumferentially around the spring housing 19.
  • the centres of the apertures 23 are mutually spaced circumferentially by 120 o .
  • each aperture 23 has a slot profile so that each steel ball 13 may move circumferentially, by about 40 o in the embodiment, within its corresponding aperture 23.
  • Each ball 13 may also move radially within its respective aperture 23.
  • Fig 4 is a cross-sectional view of the cam ring 2 also along the line AA in Fig 1 and with the other components omitted.
  • the cam ring 2 has six recesses 24 formed in its internal surface 25.
  • Each recess 24 is equi-spaced around the internal circumference of the surface 25 and so the centre of each recess 24 is mutually spaced from the other recesses 24 by 60 o .
  • the other steel balls 13 are also located in their respective recesses 24.
  • three recess mutually spaced by 120 o may be used.
  • a fastener coupling (not shown) is attached to the square drive 21 of the shaft 1 and is engaged with a fastener, such as a screw or bolt (not shown).
  • a fastener such as a screw or bolt (not shown).
  • An operator then grips the handle 3 with his hand and applies a rotational torque to the handle 3.
  • the spring 6 forces the steel balls 13 outwards via the spring pad 16 and the 1 / 2 inch steel ball 12, the steel balls 13 are forced into the recesses 24 in the cam ring 13.
  • rotational movement of the handle 3 which rotates the cam ring 2, as the cam ring 2 is fixed to the handle 3, forces rotation of the steel balls 13 and hence rotation of the housing 19 and shaft 1. Therefore, the torque applied to the handle 3 by the operator is transmitted to the square drive 21 and the fastener in order to tighten or loosen the fastener.
  • the threshold torque level of the screw-driver 20 may be increased or decreased as described by an appropriate choice of the strength of the spring 6.
  • the threshold may be adjusted by removing the plug 9 and moving the adjustable screw 4 up or down the inside of the housing 19 by using an appropriate tool engaged with the recesses 26 though the aperture 25.
  • the threshold is increased by compression of the spring 6 and decreased by allowing the spring to extend.
  • Fig 5 illustrates possible cam profiles in detail.
  • the recess 24 has a central radiused portion 30 of radius R1 bounded by two flat portions 31 which are each inclined at 45 o to the median plane.
  • the radius R1 is slightly larger than the radius of the balls 13.
  • the flat portions 31 join the inner cam face 32 via radiused portions 33 of radius R2. This cam profile is similar to that used in prior art screwdrivers.
  • the recess 24 consists of a radiused portion 30 of radius R1 and the joining radiused portions 33 of radius R2, R2 suitably being equal to R2 of Fig. 5A and R1 being equal to the radius of the balls 13 .
  • Fig 6 illustrates the form of the slots 23 in greater detail.
  • the circumferential extent of each slot can be defined in terms of a nominal angle ⁇ between the centre of the ball when at its end positions. This dimension can also be defined in terms of the path length X taken along the mean diameter of the sleeve and expressed as a proportion of the ball diameter D.
  • Table I summarises experiments carried out on different slot sizes, which indicate that longer slots are more effective in reducing reverse torque.
  • the reverse torque figures in Table I are given for a spring setting for a nominal forward torque of 90 cN.m.
  • This invention thus provides an improved torque-applying device which reduces the risk of reverse torque being inadvertently applied. It has also been found that the device of the invention reduces the risk of repetitive strain injury to the operator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP92308171A 1991-09-10 1992-09-09 Moyens pour exercer un couple sur un moyen de serrage Withdrawn EP0532289A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9119313 1991-09-10
GB919119313A GB9119313D0 (en) 1991-09-10 1991-09-10 A device for applying torque to a fastener
GB919119890A GB9119890D0 (en) 1991-09-18 1991-09-18 A device for applying torque to a fastener
GB9119890 1991-09-18

Publications (1)

Publication Number Publication Date
EP0532289A1 true EP0532289A1 (fr) 1993-03-17

Family

ID=26299522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92308171A Withdrawn EP0532289A1 (fr) 1991-09-10 1992-09-09 Moyens pour exercer un couple sur un moyen de serrage

Country Status (1)

Country Link
EP (1) EP0532289A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755754A1 (fr) * 1995-07-26 1997-01-29 HILTI Aktiengesellschaft Dispositif de vissage
EP1477278A2 (fr) * 2003-05-10 2004-11-17 Mhh Engineering Co Ltd Mécanisme d'embrayage pour un tournevis dynamométrique
DE10143181B4 (de) * 2001-09-04 2005-03-03 Willi Hahn Gmbh & Co. Kg Vorrichtung zur Begrenzung des von einem Schraubwerkzeug übertragbaren Drehmoments
CN102653084A (zh) * 2012-04-23 2012-09-05 中山市长富五金制品有限公司 一种新型扭力扳手
WO2015151096A1 (fr) * 2014-04-03 2015-10-08 MIS Implants Technologies Ltd. Dispositif de fixation rotatif à limiteur de couple intégré
CN107584449A (zh) * 2017-09-26 2018-01-16 北京无线电测量研究所 一种用于拧紧螺纹连接件的可调扭矩转接装置
US11311988B2 (en) * 2018-08-16 2022-04-26 Wen-Chin Kuo Torque connector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1569991A (fr) * 1968-04-23 1969-06-06
DE2819226A1 (de) * 1978-05-02 1979-11-08 Holland Letz Guenter Schraubkupplung mit drehmomentabschaltung
DE3140288A1 (de) * 1981-10-10 1983-04-28 Saltus-Werk Max Forst GmbH & Co, 5650 Solingen Selbstausloesender drehmomentschluessel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1569991A (fr) * 1968-04-23 1969-06-06
DE2819226A1 (de) * 1978-05-02 1979-11-08 Holland Letz Guenter Schraubkupplung mit drehmomentabschaltung
DE3140288A1 (de) * 1981-10-10 1983-04-28 Saltus-Werk Max Forst GmbH & Co, 5650 Solingen Selbstausloesender drehmomentschluessel

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755754A1 (fr) * 1995-07-26 1997-01-29 HILTI Aktiengesellschaft Dispositif de vissage
US5709275A (en) * 1995-07-26 1998-01-20 Hilti Aktiengesellschaft Screw-driving tool
DE10143181B4 (de) * 2001-09-04 2005-03-03 Willi Hahn Gmbh & Co. Kg Vorrichtung zur Begrenzung des von einem Schraubwerkzeug übertragbaren Drehmoments
EP1477278A2 (fr) * 2003-05-10 2004-11-17 Mhh Engineering Co Ltd Mécanisme d'embrayage pour un tournevis dynamométrique
EP1477278A3 (fr) * 2003-05-10 2006-10-04 Mhh Engineering Co Ltd Mécanisme d'embrayage pour un tournevis dynamométrique
CN102653084A (zh) * 2012-04-23 2012-09-05 中山市长富五金制品有限公司 一种新型扭力扳手
CN102653084B (zh) * 2012-04-23 2015-08-12 中山市长富五金制品有限公司 一种新型扭力扳手
WO2015151096A1 (fr) * 2014-04-03 2015-10-08 MIS Implants Technologies Ltd. Dispositif de fixation rotatif à limiteur de couple intégré
CN107584449A (zh) * 2017-09-26 2018-01-16 北京无线电测量研究所 一种用于拧紧螺纹连接件的可调扭矩转接装置
CN107584449B (zh) * 2017-09-26 2019-03-15 北京无线电测量研究所 一种用于拧紧螺纹连接件的可调扭矩转接装置
US11311988B2 (en) * 2018-08-16 2022-04-26 Wen-Chin Kuo Torque connector

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