EP3307485A1 - Nut socket unit for power wrenches - Google Patents

Nut socket unit for power wrenches

Info

Publication number
EP3307485A1
EP3307485A1 EP15728003.3A EP15728003A EP3307485A1 EP 3307485 A1 EP3307485 A1 EP 3307485A1 EP 15728003 A EP15728003 A EP 15728003A EP 3307485 A1 EP3307485 A1 EP 3307485A1
Authority
EP
European Patent Office
Prior art keywords
socket body
sleeve
nut
socket
end portion
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.)
Granted
Application number
EP15728003.3A
Other languages
German (de)
French (fr)
Other versions
EP3307485B1 (en
Inventor
Alexander Dubs
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.)
Atlas Copco Industrial Technique AB
Original Assignee
Saltus Industrial Technique GmbH
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 Saltus Industrial Technique GmbH filed Critical Saltus Industrial Technique GmbH
Publication of EP3307485A1 publication Critical patent/EP3307485A1/en
Application granted granted Critical
Publication of EP3307485B1 publication Critical patent/EP3307485B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • 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
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0035—Connection means between socket or screwdriver bit and tool

Definitions

  • the invention relates to a nut socket unit to be attached to a power wrench and including an arresting means for locking the nut socket unit to the output shaft of the power wrench.
  • a well-known standard type of nut socket has a square cross sectional recess at its rear end intended for receiving the square shaped end portion of a power wrench output shaft.
  • the nut socket At its front end the nut socket has an internal cross sectional shape adapted to fit the type of screw joint to be tightened, for instance a hexagonal shape.
  • the nut socket is also provided with an arresting means for locking the nut socket to the output shaft of the power wrench. This arresting means could be of different types but is normally shiftable between a locking position and a release position by means of an external maneuver sleeve .
  • a problem concerned with this previous type of nut sockets is that the maneuver sleeve is co-rotating with the nut socket and may constitute a risk for injuries on the part of the operator. Also the front part of the nut socket protruding in front of the maneuver sleeve may constitute a potential risk for injuries, for instance in case of an operator glove being tangled between the nut socket and the working object.
  • Fig. 1 shows a longitudinal section of a nut socket unit according to one embodiment of the invention illustrating the arresting means in its locked position.
  • Fig. 2 shows a rear end view of the nut socket unit in Fig. 1.
  • Fig.3 shows a front end view of the nut socket unit in Fig. 1.
  • Fig. 4 shows a side view, partly in section, of a nut socket unit according to an alternative embodiment of the invention.
  • Fig. 5 shows a rear end view of the nut socket unit in Fig. 4.
  • Fig. 6 shows a front end view of the nut socket unit in Fig. 4.
  • the nut socket unit illustrated in Figs 1-4 comprises a tubular socket body 10 having a rear end portion 11 including a recess 12 of square cross section for receiving a square end of a power wrench output shaft.
  • the socket body 10 is formed with a front end portion 13 having a hexagonal recess 14 for engagement with the hexagonal head or nut of a screw joint to be tightened.
  • an arresting mechanism 15 for locking the nut socket unit to an output shaft of a power wench.
  • This arresting mechanism 15 comprises a number of balls 16 received in lateral apertures 18 in the socket body 10 and intended to cooperate with the output shaft of a power wrench to lock the nut socket unit to that shaft.
  • a maneuver sleeve 19 is axially displaceable on the outside of the socket body 10 between a lock position in which the balls 16 are retained in their inner positions accomplishing a locking engagement with a power wrench output shaft, and a release position in which the balls 16 are free to move radially outwardly to release the nut socket unit from the power wrench output shaft.
  • the maneuver sleeve 19 is provided with an inner annular recess 20 which is intended to enable the outward release movement of the balls 16 as the maneuver sleeve 19 is occupies its forward most position, i.e. the release position. In that position of the maneuver sleeve 19 and the balls 16 the nut socket unit is free to be disconnected from a power wrench output shaft.
  • an outer sleeve 21 preferably made of a plastic material and provided with a friction enhancing pattern on its envelope surface.
  • a number springs 22 are provided between the maneuver sleeve 19 and a support ring 23 on the socket body 10 so as to exert a bias force on the maneuver sleeve 19 in the ball locking direction of the latter.
  • the support ring 23 is freely rotatable on the socket body 10 and is axially backed by a lock ring 25 mounted in a circumferential groove 26 in the socket body 19.
  • the springs 22 are received in bores 24 in the maneuver sleeve 19 which means that the springs 22 are positively locked relative to the maneuver sleeve 19 for co-rotation with the latter.
  • the lock ring 25 has an outer diameter that is small enough to permit the maneuver sleeve 19 to pass on its outside when displaced from its rear lock position to its forward release position.
  • the front end portion 13 of the socket body 10 may be of different lengths depending on the type of screw joint to be tightened, and in case of an extended front end portion 13 in particular there would be a risk for injuries of the same kind as the with the maneuver sleeve 19, namely tangling of an operators glove.
  • the front end portion 13 of the socket body 10 is provided with a freely rotatable protection sleeve 30.
  • This protection sleeve 30 is axially locked relative to the socket body 10 by an inner circumferential ridge 31 in engagement with a circumferential groove 32 in the socket body 10.
  • the protective sleeve 30 is preferably made of a plastic material (e.g. POM) having a relatively low friction coefficient to facilitate easy relative movement between the sleeve 19,30 and the socket body 10, and is axially locked to the socket body 10 in that the inner ridge 31 snaps into the groove 32 via an elastic deformation of the sleeve 30 when mounted on the socket body 10.
  • POM plastic material
  • a tubular socket body 50 has a forward end portion 53 formed with a polygonal recess 54 for engagement with a screw joint having identically shaped parts.
  • a recess 52 At its rear end portion 51 of the socket body 50 is provided with a recess 52 of square cross section for receiving a square end of a power wrench.
  • an arresting mechanism 55 At the rear end of the socket body 50 there is also provided an arresting mechanism 55 for locking the nut socket unit to an output shaft of a power wrench.
  • This arresting mechanism 55 comprises a removable lock pin 56 which extends radially relative to the socket body 50 when inserted in the nut socket unit.
  • the lock pin 56 has a length about the same as the outer diameter of the rear end portion 51 of the socket body 50 and extends in its inserted position into two opposite apertures 57,58 in the socket body 50.
  • the lock pin 56 is intended to extend through a transverse bore in a power wrench output shaft to lock the nut socket unit to the power wrench.
  • a maneuver sleeve 59 is axially displaceable on the outside of the socket body 50 between a rear lock position covering the apertures 57,58, thereby preventing the pin 56 from falling out, and a forward release position.
  • the maneuver sleeve 59 is provided with two oppositely located apertures 60, 61 through which the lock pin 52 may be removed before attachment of the nut socket unit or at detachment of the nu socket unit from a power wrench output shaft.
  • the apertures 57,58 are uncovered and the lock pin 56 may be removed. Then, the nut socket unit may be detached from a power wrench output shaft.
  • the maneuver sleeve 59 is preferably made of a plastic material.
  • the maneuver sleeve 59 is freely rotatable relative to the socket body 50, and a number of springs 62 are provided to bias the sleeve 59 toward its rear lock position.
  • the springs 62 are evenly distributed along the periphery of the sleeve and act against a support ring 63 which is likewise freely rotatable relative to the socket body 50.
  • the support ring 63 is backed by a lock ring 65 mounted in a circumferential groove 66 in the socket body 50.
  • the maneuver sleeve 59 is provided with bores 64 for receiving and supporting a rear part of the springs 62, thereby making the springs 62 safely follow the maneuver sleeve 59 at rotation relative to the socket body 50.
  • the maneuver sleeve 59 is freely rotatable relative to the socket body 50.
  • a safety risk related to the forwardly extending end portion 53 of the socket body 50 which rotates during screw joint tightening operations is provided on the end portion 53.
  • the protective sleeve 70 is axially locked relative to the socket body 50 by means of an inner
  • the protective sleeve 70 carried on the front end portion 53 of the socket body 50 is preferably made of a plastic material (e.g. POM) having a relatively low friction coefficient to facilitate easy relative movement between the sleeve 59, 70 and the socket body 50, and is axially locked to the socket body 50 in that the inner ridge 71 snaps into the groove 72 via an elastic deformation of the sleeve 70 when mounted on the socket body 50.
  • a plastic material e.g. POM

Landscapes

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

Abstract

A nut socket unit for power wrenches, comprising a tubular socket body (10;50) with a front end portion (13;53) adapted for engagement with a screw joint, and a rear end portion (11;51) adapted for connection to a power wrench output shaft, and an arresting mechanism (15;55) for locking the socket body (10;50) to a power wrench output shaft, wherein the arresting mechanism (15;59) includes an axially displaceable maneuver sleeve (19;59), wherein the maneuver sleeve (19;59) is freely rotatable relative to the socket body (10;50). At the front end portion (13;53) of the socket body (10;50) there is also provided a freely rotatable protective sleeve (30;70) for operator protective purposes.

Description

Nut socket unit for power wrenches .
The invention relates to a nut socket unit to be attached to a power wrench and including an arresting means for locking the nut socket unit to the output shaft of the power wrench.
A well-known standard type of nut socket has a square cross sectional recess at its rear end intended for receiving the square shaped end portion of a power wrench output shaft. At its front end the nut socket has an internal cross sectional shape adapted to fit the type of screw joint to be tightened, for instance a hexagonal shape. The nut socket is also provided with an arresting means for locking the nut socket to the output shaft of the power wrench. This arresting means could be of different types but is normally shiftable between a locking position and a release position by means of an external maneuver sleeve .
A problem concerned with this previous type of nut sockets is that the maneuver sleeve is co-rotating with the nut socket and may constitute a risk for injuries on the part of the operator. Also the front part of the nut socket protruding in front of the maneuver sleeve may constitute a potential risk for injuries, for instance in case of an operator glove being tangled between the nut socket and the working object.
It is an object of the invention to avoid the above safety problem by providing an improved nut socket unit comprising a rotatable nut socket body and an external sleeve element that is freely rotatable relative to the nut socket body.
It is a further object of the invention to provide a nut socket unit including a rotatable nut socket body and an arresting means for connection of the nut socket body to an output shaft of a power wrench, wherein the arresting means comprises an external maneuver sleeve which is freely rotatable relative to the nut socket body for avoiding injury problems. Still further objects and advantages of the invention will appear from the following specification and claims.
A preferred embodiment of the invention is described below in detail with reference to the accompanying drawing.
In the drawing
Fig. 1 shows a longitudinal section of a nut socket unit according to one embodiment of the invention illustrating the arresting means in its locked position..
Fig. 2 shows a rear end view of the nut socket unit in Fig. 1. Fig.3 shows a front end view of the nut socket unit in Fig. 1. Fig. 4 shows a side view, partly in section, of a nut socket unit according to an alternative embodiment of the invention. Fig. 5 shows a rear end view of the nut socket unit in Fig. 4. Fig. 6 shows a front end view of the nut socket unit in Fig. 4.
The nut socket unit illustrated in Figs 1-4 comprises a tubular socket body 10 having a rear end portion 11 including a recess 12 of square cross section for receiving a square end of a power wrench output shaft. The socket body 10 is formed with a front end portion 13 having a hexagonal recess 14 for engagement with the hexagonal head or nut of a screw joint to be tightened.
In the rear end portion 11 of the socket body 10 there is provided an arresting mechanism 15 for locking the nut socket unit to an output shaft of a power wench. This arresting mechanism 15 comprises a number of balls 16 received in lateral apertures 18 in the socket body 10 and intended to cooperate with the output shaft of a power wrench to lock the nut socket unit to that shaft. A maneuver sleeve 19 is axially displaceable on the outside of the socket body 10 between a lock position in which the balls 16 are retained in their inner positions accomplishing a locking engagement with a power wrench output shaft, and a release position in which the balls 16 are free to move radially outwardly to release the nut socket unit from the power wrench output shaft. At its rear end the maneuver sleeve 19 is provided with an inner annular recess 20 which is intended to enable the outward release movement of the balls 16 as the maneuver sleeve 19 is occupies its forward most position, i.e. the release position. In that position of the maneuver sleeve 19 and the balls 16 the nut socket unit is free to be disconnected from a power wrench output shaft. For obtaining an improved grip on the maneuver sleeve 19 it is provided with an outer sleeve 21, preferably made of a plastic material and provided with a friction enhancing pattern on its envelope surface.
A number springs 22 are provided between the maneuver sleeve 19 and a support ring 23 on the socket body 10 so as to exert a bias force on the maneuver sleeve 19 in the ball locking direction of the latter. The support ring 23 is freely rotatable on the socket body 10 and is axially backed by a lock ring 25 mounted in a circumferential groove 26 in the socket body 19. The springs 22 are received in bores 24 in the maneuver sleeve 19 which means that the springs 22 are positively locked relative to the maneuver sleeve 19 for co-rotation with the latter. The lock ring 25 has an outer diameter that is small enough to permit the maneuver sleeve 19 to pass on its outside when displaced from its rear lock position to its forward release position.
To shift the arresting mechanism 15 from its lock position, as illustrated in Fig. 1, to its release position the maneuver sleeve 19 has to be pushed in a forward direction against the bias force of the springs 22, thereby permitting the balls 16 to be displaced outwardly into the annular recess 20 in the maneuver sleeve 19 to thereby release the nut socket unit from a power wrench output shaft.
By arranging the maneuver sleeve 19 with its outer sleeve 21 freely rotatable relative to the socket body 19 the operator is protected from getting injured due to for instance a glove being tangled between the nut socket unit and a work piece during screw joint tightening operations.
The front end portion 13 of the socket body 10 may be of different lengths depending on the type of screw joint to be tightened, and in case of an extended front end portion 13 in particular there would be a risk for injuries of the same kind as the with the maneuver sleeve 19, namely tangling of an operators glove. In order to prevent such injury risks the front end portion 13 of the socket body 10 is provided with a freely rotatable protection sleeve 30. This protection sleeve 30 is axially locked relative to the socket body 10 by an inner circumferential ridge 31 in engagement with a circumferential groove 32 in the socket body 10.
The protective sleeve 30 is preferably made of a plastic material (e.g. POM) having a relatively low friction coefficient to facilitate easy relative movement between the sleeve 19,30 and the socket body 10, and is axially locked to the socket body 10 in that the inner ridge 31 snaps into the groove 32 via an elastic deformation of the sleeve 30 when mounted on the socket body 10.
In the embodiment of the invention illustrated in Figs 4-6, a tubular socket body 50 has a forward end portion 53 formed with a polygonal recess 54 for engagement with a screw joint having identically shaped parts. At its rear end portion 51 of the socket body 50 is provided with a recess 52 of square cross section for receiving a square end of a power wrench. At the rear end of the socket body 50 there is also provided an arresting mechanism 55 for locking the nut socket unit to an output shaft of a power wrench. This arresting mechanism 55 comprises a removable lock pin 56 which extends radially relative to the socket body 50 when inserted in the nut socket unit. The lock pin 56 has a length about the same as the outer diameter of the rear end portion 51 of the socket body 50 and extends in its inserted position into two opposite apertures 57,58 in the socket body 50. The lock pin 56 is intended to extend through a transverse bore in a power wrench output shaft to lock the nut socket unit to the power wrench. A maneuver sleeve 59 is axially displaceable on the outside of the socket body 50 between a rear lock position covering the apertures 57,58, thereby preventing the pin 56 from falling out, and a forward release position. At its rear end the maneuver sleeve 59 is provided with two oppositely located apertures 60, 61 through which the lock pin 52 may be removed before attachment of the nut socket unit or at detachment of the nu socket unit from a power wrench output shaft. In the release position of the sleeve 59 the apertures 57,58 are uncovered and the lock pin 56 may be removed. Then, the nut socket unit may be detached from a power wrench output shaft. The maneuver sleeve 59 is preferably made of a plastic material.
For safety reasons the maneuver sleeve 59 is freely rotatable relative to the socket body 50, and a number of springs 62 are provided to bias the sleeve 59 toward its rear lock position. The springs 62 are evenly distributed along the periphery of the sleeve and act against a support ring 63 which is likewise freely rotatable relative to the socket body 50. The support ring 63 is backed by a lock ring 65 mounted in a circumferential groove 66 in the socket body 50. The maneuver sleeve 59 is provided with bores 64 for receiving and supporting a rear part of the springs 62, thereby making the springs 62 safely follow the maneuver sleeve 59 at rotation relative to the socket body 50.
Accordingly, for protecting the operator from injuries at screw joint tightening operations due for instance tangled gloves the maneuver sleeve 59 is freely rotatable relative to the socket body 50. However, there is still a safety risk related to the forwardly extending end portion 53 of the socket body 50 which rotates during screw joint tightening operations. To eliminate that risk a feely rotatable protective sleeve 70 is provided on the end portion 53. The protective sleeve 70 is axially locked relative to the socket body 50 by means of an inner
circumferential ridge 71 engaging an annular groove 72 on the socket body 50.
The protective sleeve 70 carried on the front end portion 53 of the socket body 50 is preferably made of a plastic material (e.g. POM) having a relatively low friction coefficient to facilitate easy relative movement between the sleeve 59, 70 and the socket body 50, and is axially locked to the socket body 50 in that the inner ridge 71 snaps into the groove 72 via an elastic deformation of the sleeve 70 when mounted on the socket body 50.
It is to be noted that the invention is not limited to the above described examples but may be freely varied within the scope of the claims .

Claims

Claims .
1. A nut socket unit for power wrenches, comprising a tubular socket body (10; 50) adapted for engagement with a screw joint and for connection to the output shaft of a power wrench, c h a r a c t e r i z e d in that a freely rotatable sleeve
(19,30; 59,70) is provided on the outside of the socket body
(10;50) for operator protecting purpose.
2. Nut socket unit according to claim 1, wherein an arresting mechanism (15; 55) is provided for locking the socket body (10; 50) to a power wrench output shaft and includes an axially displaceable maneuver sleeve (19; 59) for shifting said arresting mechanism (15; 55) between a lock position and a release position, said maneuver sleeve (19;59) is freely rotatable relative to the socket body (10; 50) for protective purpose .
3. Nut socket unit according to claim 2, wherein a number of springs (22; 62) are provided between said maneuver sleeve (19; 59) and the socket body (10; 50) for biassing the maneuver sleeve (19; 59) toward said lock position.
4. Nut socket unit according to claim 1, wherein the socket body (10; 50) comprises a forward end portion (13; 53) for engagement with a screw joint, and said freely rotatable protective sleeve (30; 70) is supported on said forward end portion (13; 53) .
5. Nut socket unit according to claim 4, wherein said protective sleeve (30; 70) is axially locked relative to said socket body front end portion (13; 53) via an inner ridge (31; 71) co-operating with a circumferential groove (32; 72) on said socket body front end portion (13; 53) .
6. Nut socket unit according to claim 4 or 5, wherein said protective sleeve (30; 70) consists of a plastic material and is elastically deformable at mounting on said socket front end portion (13; 53) for obtaining said locking cooperation between said inner ridge (31; 71) and said circumferential groove (32;72) .
EP15728003.3A 2015-06-11 2015-06-11 Nut socket unit for power wrenches Active EP3307485B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/063069 WO2016198115A1 (en) 2015-06-11 2015-06-11 Nut socket unit for power wrenches

Publications (2)

Publication Number Publication Date
EP3307485A1 true EP3307485A1 (en) 2018-04-18
EP3307485B1 EP3307485B1 (en) 2020-12-16

Family

ID=53373472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15728003.3A Active EP3307485B1 (en) 2015-06-11 2015-06-11 Nut socket unit for power wrenches

Country Status (4)

Country Link
EP (1) EP3307485B1 (en)
JP (1) JP6596154B2 (en)
CN (1) CN107980018B (en)
WO (1) WO2016198115A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018129533A1 (en) * 2018-06-14 2019-12-19 HELLA GmbH & Co. KGaA Device for the automated production of screw connections by means of a screw
CN112775900B (en) * 2019-11-08 2022-08-16 华晨宝马汽车有限公司 Spark plug screwing device
SE545106C2 (en) * 2020-12-01 2023-04-04 Atlas Copco Ind Technique Ab Torque transferring device for use with a power tool
WO2022204349A1 (en) * 2021-03-25 2022-09-29 Milwaukee Electric Tool Corporation Quick release socket

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
JPH10113829A (en) * 1996-10-08 1998-05-06 Suzuki Motor Corp Tightening socket
AU2001242765A1 (en) * 2000-03-24 2001-10-03 Kyoto Tool Co., Ltd. Connection structure of socket wrench
JP2003170366A (en) * 2001-09-26 2003-06-17 ▲高▼野 厚子 Tool for impact wrench
GB2408713B (en) * 2003-12-05 2007-09-05 Chih-Ching Hsien Ratchet socket tool
JP2008142794A (en) * 2006-12-06 2008-06-26 Takebe Tekkosho:Kk Fastening tool
CN200998854Y (en) * 2007-01-09 2008-01-02 包哲尧 Locking mechanism for pneumatic screwdriver tool head
JP2010221336A (en) * 2009-03-24 2010-10-07 Robert Bosch Gmbh Rotary tool equipped with two or more tool mounting interfaces
CN201493787U (en) * 2009-04-16 2010-06-02 浙江吉利汽车有限公司 Sleeve
JP2011251357A (en) * 2010-06-01 2011-12-15 Toyota Industries Corp Impact rotary tool
US20150151412A1 (en) * 2013-12-02 2015-06-04 Timmy Chen Socket Tool Adapted for Nuts of Varying Size

Also Published As

Publication number Publication date
JP6596154B2 (en) 2019-10-23
CN107980018B (en) 2019-11-22
WO2016198115A1 (en) 2016-12-15
CN107980018A (en) 2018-05-01
EP3307485B1 (en) 2020-12-16
JP2018520900A (en) 2018-08-02

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