CA1325739C - Locking socket wrench drive device - Google Patents

Locking socket wrench drive device

Info

Publication number
CA1325739C
CA1325739C CA000576565A CA576565A CA1325739C CA 1325739 C CA1325739 C CA 1325739C CA 000576565 A CA000576565 A CA 000576565A CA 576565 A CA576565 A CA 576565A CA 1325739 C CA1325739 C CA 1325739C
Authority
CA
Canada
Prior art keywords
socket
shank
control bar
extension
detent
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 - Fee Related
Application number
CA000576565A
Other languages
French (fr)
Inventor
Michael F. Nickipuck
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.)
Qualicorp Ltd
Original Assignee
Michael F. Nickipuck
Qualicorp, 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 Michael F. Nickipuck, Qualicorp, Ltd. filed Critical Michael F. Nickipuck
Priority to CA000576565A priority Critical patent/CA1325739C/en
Priority to PCT/US1988/003057 priority patent/WO1990002634A1/en
Priority claimed from PCT/US1988/003057 external-priority patent/WO1990002634A1/en
Application granted granted Critical
Publication of CA1325739C publication Critical patent/CA1325739C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007Connections or joints between tool parts
    • B25B23/0035Connection means between socket or screwdriver bit and tool

Abstract

ABSTRACT

A socket wrench drive extension incorporates a quick release and locking feature. The extension is used in conjunction with a ratchet drive and standard mechanics sockets for driving threaded fasteners. The extension uses a longitudinal control bar which bears directly or indirectly on a detent contained in a transverse bore at the driving end of the extension. The control bar fits in a channel on the exterior of the extension and is operated through the retraction of a spring loaded collar.

Description

~ ~32~739 BACKGROUND OF THE INVENTION
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Socket wrenches incorporating ratchet drives and standard ~ockets for driving threaded fasteners including most commonly hexagonal nuts and bolt heads are commonly used in the mechanic's field. In situations where a mechanic is confronted with the requirement for driving a fastener located in a tight space restricting the swing of the drive ratchet handle, extension drives are utilized to transmit the force from he ratchet to the socket. When driving a fastener in a remote location and particularly in a situation where the work must be accomplished in close quarters and with obstructions present, it is desirable to have a mechanism by which the socket can be locked to the extension. In addition to the desirability of a locking feature, it is necessary to provide for ~he rapid changing o~ sockets for driving various sizes o fasteners. In the environment in which a mechanic works, for examplet in repairing vehicles or machinery, the mechanic often encounters an adverse environment in~olving temperature variationst corroded or damaged fast2ners, time pre~sures regarding the completion of jobs as well as oily and greasy conditions rendering a positive locking and releasing feature desirable. Under these situations, it is desirable for any mechanism to be simple and reliable as well as durable while proving an effective means of improving the efficiency of the -: ~; ' . ' '' 'v'~''.~ :' . . .

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wor~. Another requirement for mechanic's tools is that they be relatively simple to manufacture and maintain.
Various methods are known by which fastener drive sockets can be affixed to mechanis~s with which to drive those sockets. ~ost systems involve methods tailored to specific needs providing positive locking mechanisms for tools such as impact wrenches, where it is important to have the sockets firmly attached to the drive. In these applications complicated machining may be utilized since the drive mechanisms are of a relatively large size and bulk providing adequate strength despite extensive internal machining. In addition, these mechanisms are all devised to be utilized in a location where the operator is provided ample work space and compactness of the mechanism is not an important factor. Known mechanisms incorporate locking means such as external rotating collars which are unsuitable release from friction with obstructions (Rhinevault U.S. Patent No.
2,162,359 issued June 13, 1939). Other mechanisms involve plungers as locking mechanisms which must be released utilizing a separate (Beers U.S. Patent No.
2,954,994 issued October 4, 1960; Wendling U.S. Patent No. 2,987,334 issued June 6, 1961. Other locking mechanisms involve the use of set screws, pins or other awkward releasing mechanisms requiring the removal of the socXët from the fastener or workpiece and preventing rapid releasing of soc~ets in work in close quarterS
(Coffman U.S. Patent No. 2,677,562 issued May 4, 1954).
one other type of mechanism known in an application similar to that for the instant invention is a push button release for a ratchet socket drive. This mechanism is unliXe the invention in that it requires . . , ~", :. ~ '` '', '.
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relatively complicated machining is relatively difficult to maintain and subject to malfunction from dirt or wear and is unsuitable for use on extensions because of the utilization of a central axial bore and pushbutton.
Finally, this type of mechanism involves application of both a downward pressure on a pushbutton plunger while requiring the resistance against which this force is applied as well as the simultaneous movement of the socket in the same direction as the pushbutton and in the direction opposite the resistance, which is an awkward motion for a mechanic in tight spaces. The pushbutton ratchet release also requires that the mechanism be machined out of larger pieces for the same strength as non-machined parts, rendering it frequently difficult to utilize the ratchet and socket combination alone in tight spaces tSmyers U.S. Patent No. 3,762,245 issued October 2, 1973).
The invention provides for the utilization of ths locking and quick releasing feature as a supplement to the ratchet handle which may be made smaller yet stxonger than the cumbersome quick release type ratchet handle.
Improved embodiments utilize alternative arrangements of the elements so as to enhance the utility and ease of operation of the tool. Through the co-action of the various elements in these improvements several additional goals can be accomplished in addition to those discussed in my prior applications and patent. The first of these improvements utilizes the camming engagement of a series of retainer balls and a novel camming control bar to provide wedging between the bar and balls for effectively locking an associated socket. The second improvement uses the placement of a spring co-acting with the retainer balls so as to prevent ~'.~ .

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loss of an associated socket upon accidental release of the locking sleeve. The third improvement utilizes a lock-back mechanism to increase the ease of placement o~ the socket on the tool. A fourth embodiment uses a securement por~ion as a separate structure from an extension shank. A fifth embodiment uses a notched control bar to provide Eor semi-automatic retraction.
The advantage in the use of a camming control bar is that the forces contributing to retention are increased under load, Another advantage is that engagement wi~h a recess in a socket is less important that in any prior embodiments.
An advantage in the use of a spring co-acting with retainer balls is that a degree of increased friction is imparted between the drive extension and the socket walls even in the released position.
An advantage to the lock-back mechanism and the notch control bar embodiment are that either provides a degree of semi-automatic action in the retraction.

SUMMARY OF THE INVENT}ON

In accordance with the invention~ a socket wrench drive extension is designed for use in conjunction with a ratchet driue handle and standard soc~ets ~or drivlng threaded fasteners. The extension incorporates a longitudinal control bar channel machined in one phase o~ the square drive portion of the socket and extending past the shoulder separating the driven portion from the extension portion of the devlce. ~ control bar i5 incorporated ..;~ . . . .

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which is slidably mounted within the machined control bar channel,moving longitudinally therein. The lower end of the control bar is machined in this embodiment to an angle of approximately 15'-30'beveled to the lips. The control bar comprises a flat portion conti~uous to the inclined ar beveled portion. The inclined or beveled portion in this embodiment is o a dimension longitudinally such that the lower most por~ion of the co~ntrol bar does not extend past the lower-most portion of the extension drive portion when ~he control bar is deflected fully forward or downward, while the upper edge of the -inclined portion of the control at full forward or ~ownward deflection does not extend as far as the bearlng meas which transmit the lateral force rom the control bar to the detent and thereafter maintaining the socket in locked position until release. When the control bar is at full forward extension the flat portion of the control bar comes in contact with the locking ball bearing thereby locking the detent ln position against the wall of the socket and the retainer groove machined therein.
A-detent or retainer ball is slidably carried in the transverse aperture of the drive portion of the extension which when in locked position against the locking bearing ball and con~rol bar exerts lateral force against the detant extending past ~he faca in the square drive portion of the extension opposite the ~ace into which the control bar channel is machined. The lateral exten~ion of thi~ detent ma~es with standard recesses machined in the drive walls of standard sockets and preven~s the downward or forward movement of said sockets. The outward extension of the ~ ",~' " ' ' ' .
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detent further serves to lock the socket in position with relation to the drive axis of the extension in that lateral pressure is exerted on the drive wall of the socket by the detent in its locked position and the control bar along the opposite face of the drive wall of the socket.
Longitudinal movemen~ of the control bar from the locked to the released position is accomplished by the rearward movement of the sleeve. The rearward force is transmitted to the control bar through the utilization of a spur, or appendage in the control bar from a slidably moun.ted collar located some distance up the extension from the drive portion of the extension. The re,arward motion of the slidably mounted collar is accomplished by moving said collar rearwar.d against the forward spring pressure of the helical spring enclosed by the collar and wound around the body o the extension itself.
The mechanism i5 mai,ntained in its loc~ed position through the use of a spring exerting forward or downward pressure against the release collar and locked in its forward extension through khe use of circular clip ring ox clamp.
An additional embodimen~ utilize~ the device herein de~cribed with modifications so as to provide for a locking and release action at both the driven end of a socket wrench drive shank and the driving end. In this embodimen~, the sliding collar has been rearwardly extended and is o~ a dimension sufficient to be slidably carried relative to the outside diameter of the driven portion of the placement of a fixedly mounted pin in the surface of the shank, said pin intersecting a generally L-shaped slot ~: A~

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~ 132~7~9 permits limited forward and rearward travel and limited rotational travel.
The further modification of the sleeve to encompass this embodiment includes the placement of one or more grooves or recesses in the inner surface of the sleeve in the section where it rearwardly extends over the surface of the driven end of the shank. These recesses permit the retraction of a retainer ball placed in said driven end. The recesses are so oriented such that the rotation and rearward movement of the sleeve results in the exertion of inward pressure on the driven end re~ainer ball or balls. When one driven end retainer ball is oriented so as to compress the customary retainer ball on the driving end of a ratchet wrench or other equivalent driving tool, the shank of the invention is ~ixedly mounted with respect thereto.
Through the use of this embodiment, the device can unction as an adaptor, rather than a mere quick release provision on tha end of an extension of a fixed length. In this way the quick release and locking features may be utilized in complete compatibility with a mechanic's existing set of driving tools, particularly with extensions of varied lengths. A ~urther advantage is that the driven end locking feature provides a positive locking action thus avoiding unwanted release of the device itself or the tools at~ached to the driving end of the device.

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~:~~'' 13 2 ~ 7 3 9 BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of the invention and a standard socket in the release posi~ion.
Fig. 2 is a perspective view o~ the invention and a standard socket in the locked position.
Fig. 3 is a fragmentary sectional view o the invention in its released position.
Fig~ 4 is a fragmentary sectional view of the invention in its locked position shown in conjunction with a standard socket.
Fig. 5 is an exploded perspective view of the invention showing its parts in relation to each other.
Fig. 6 is a perspective view of the device as adapted to a power socket wrench drive device through the use of a yoke and bearing.
Fig. 7 is a fragmentary sectional view of the device in its embodimenL utilizing a retainer ball and single bearing ball.
Fig. 8 i5 a fragmentary sectional view of the device utilizing a multiplicity of ball bearings as ~orce transmittal device~
Fig. 9 is a fragmentary sectional view of an embodimPnt of the device utilizing a single retention mem~er of generally cylindrical configuration.
Fig. 10 constitutes a perspective view of the device in its double locking embodiment in the locked position.

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FiB. 11 constitutes a fragmentary sectional view of the device in its double locking embodiment in the released position.
Fig. 12 constitutes a fragmentary sectional view of the device in its double locking embodiment in the locked position.
Fig. 13 constitutes an exploded view of the device in its double locking embodiment, further demonstrating the method of assembly and disassembly.
Fig. 14 is an enlargèd sectional view of the element ~hown in Fig. 7.
Fig. 14a is a perspective cut away view of another embodiment of my socket locking extension.
Fig, 15 is a sectional view of one embodiment of the improved socket locking extension in the locked position.
Fig. 16 is a sectional view of one embodiment of the improved ~ocket locking extension in its released po3ition.
Fig. 17 is an enlargement of the embodiment in Fig. 2 Fig. 18 i3 an enlargement of the embodiment in Fig. 3 Fi8. 19 19 a sectional view of another embodiment o~ the improved socket locking extension in its locked position.
Fig. 20 i~ a sectional view of another embodiment of the improved socket locking extension in its locked position device.
Fig. 21 is a sectional view of another embodiment of the improved socket locking exten~ion in its relea~ed position device.
Fig. 22 is a sectional view of another embodiment of the improved socket locking extension in it~ locked position devlce.
Fig. 23 is a sectional view of an embodiment in which a separate securement structure is attached to a drive shank.

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-` ~L 3 2 5 7 3 9 Fig. 24 is a sectional view o an alternati~e embodiment i,n which a separate securement s~ructure is attached to a drive shank.
Fig. 25 is a sectional view of another embo~diment of the improved socket locking extension in its locked position.
Fig. 26 is a sectional view of another embodiment o the improved socket locking extension in its locked position.

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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawings appended hereto illustrate in Fig. 1 a socket wrench drive extension including a driven portion 11 o~ the socket drive extension, the socket wrench drive extension shank 9, and the driving portion 12 of the socket wrench drive extension. The socket wrench drive extension is designed to be driven by the square drive portion of a standard ratchet handle mating with the driven portion 11. The socket wrench drive extension drives a standard socket 21 which mates with the driving portion 12 of the socket wrench extension.
Machined in the surface of the socket wrench drive extension shank 9 is a control bar channel 10 which channel extends to a substantial portion of the shank 9 through the shoulder 27 between the shank 9 which is cylindrical in cross-section and the driving portion 12 which is square in cross-sectionO The control bar 14 includes the outer positive locking and centering portion 13 at its lower end. The sleeve engagement spur 16 is an integral part of the control bar 14 which is located equidistant from the end of the control bar and serves to engage the control bar with the sleeve 15.
The sleeve 15 includes internally machined control bar engagement spurs 28 which transmit motion from the sleeve 15 to control bar 140 Internal of the sleeve is a helical spring 17 which bears on the upper portion of the control bar engagement elements or ;~
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~ 132~39 spurs 28 at the lower end of the spring 17 while being retained by C-clip 18 fitting a groove 30 machined in the circumference of the drive extension shank 9.
The helical spring 17 is shown in its compressed position in Fig. 1 as the sleeve 15 is pulled axially toward the driven portion 11 of the extension shaft and away from the driving portion 12 of the extension shaft through a force exerted directionally upward by tha user against the outer grippable portion of engagement element 29 machined into the exterior of the sleeve. The rearward displacement of the sleeve and connected control bar accomplished the operation as demonstrated in greater detail in Fig. 3 and 4. The control bar bevelled surface 2~ then releases the ball detent mechanism thereby releasing the standard socket 21.
Fig. 2 is a perspective view which shows the preferred embodiment in position for use with the sleeve 15 released by the user and forced downward by the spring 17. As the sleeve 15 is forced downward it in turn forces the control bar 14 downward through the engagement spurs 16 and 28 which displaces the locking mechanism outward and retains the socket 21 in a locked position. The maximum extension of the control mechanism including the sleeve 15, spring 17 and control bar sleeve engagement`spur 16 is restricted by a C-clip or circlip fitted in a circumferential groove 30 machined in the shank 9 of the extension drive shaft. In improved embodiments, such as those ;

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expressed in Fig. 10 - 13, other fastening means can be substi-tuted for C-clips.
Fig. 3 is a fragmentary cross-sectional view of the preferred embodiment showing the lower portion of the drive extension shank 9, the square driving portion 12 of the socket wrench drive extension shaft. The entire control mechanism, engagement spurs 28, engagement spurs 16, control bar 14, spring 17 and C-clips 18 are shown in this sectional view.
Also shown in sectional view Fig. 3 is the lower locking portion of the control bar 14 which comprises the outer positive locking and centering portion 13 of the control bar 14, as well as the bevelled surface 25 of the control bar 14. Apparent in this sectional view is the transverse bore 19 positioned in such a way as to intersect the control bar channel 10. This trans-verse bore 19 is knurled or otherwise machined at either end todecrease the diameter of the bore so as to retain the retainer ball 24, the transmission shaft 23 the tie in the shaft for transmitting the locking force to the retainer ball 22.
Fig. 3 shows the preferred embodiment in the spring-compressed position as in Fig. 1 which permits the retainer balls22 and 24, and force transmission shaft 23 free to be displaced radially through the transverse bore toward the control bar channel thereby permitting the removal of the socket.
As can be seen in Fig. 3 the C-clips 18 further serve to .
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provide radial pressure against the outer surface of the control bar 14 to prevent its displacement outward, as does the inner wall of the sleeve 15.
Fig. 4 is a fragmentary sectional view showing the features as described in Fig. 3 as well as the socket 21 which includes a recess 26 against which the retainer ball bearing 22 is forced through operation of the control bar.
Fig. 4 shows the spring 17 in its extended configuration forcing the sleeve 15 downward through operation of the engage-ment spurs 28 and 16 to its maximum extension is restricted by the C-clip5 18. Through the operation of the engagement spurs 28 and 16 the control bar 14 is also extended downward to its maximum operating extension point. Through the range of motion the control bar downward bevelled surface 25 of the control bar applies constant force across the retainer ball 24 which through the force transmission shaft 23 extends the retainer ball 22 progressively farther outward on the opposite face the square socket drive portion 12. It is important to have the angle of the bevelled surface 25 and the distance between the widest portion of the bevelled surface 25 and the narrowest portion o~
proper dimensions so as to displace the locking mechanisms far enough to permit the locking of standard sockets by using a dimension appropriately given the standard dimension of the socket locking depression.
As downward or forward most extension of the control bar 14 :. . : : .: ~; .: ~
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occurs and outward most displacement of the locking mechanism including retainer balls 22,24 and transmission shaft 23 occurs, the flat interface of the control bar 14 prevents further transverse movement of the locking mechanism including retainer ball 22, transmission shaft 23 and retainer ball 24 by virtue of the fact that the force is acting approximately 90 degrees in relationship to the locking surface of the control bar 1~.
In the locked position the outer positive locking and centering portion 13 of the control bar 14 is in contact with the inner walls 31 of the s~uare drive on the standard socket 21.

- 13a -~ ~L32~7~9 Because of the positive locking nature of the locking mechanism any downward force on the socket while in the locked position is distributed evenly through the retainer ball 22 force transmittal shaft 23 and retainer ball 24 through the outer positive locking and centering portion 13 of the control bar 14 to provide even forces on opposite inner walls 31 of the square drive of a standard socket which serves to center the socket so that as rotational forces act on the entire mechanism through the socket wrench drive extension shaft these forces are distributed appropriately equally on or near each corner of the walls of the driving portion 12 of the socket wrench drive extension shaft and the inner walls 31 of the standard socket 21. The centering action is desirable in general to transmit equal rotational forces and in particular in cases where the driven inner walls of the standard sockets suffer from wear and or being oversized.
Fig. 5 is a perspective exploded view of an embodiment showing the parts separately in relation to each other.
Fig. 6 is a perspective view of an alternative embodiment in which the sleeve 15 is non-rotatably mounted relative to the drive shaft of a power driven socket wrench 32. In this embodi-ment the sleeve itself is mounted in a rotating bearing 33 through which the downward or rearward force is transmitted through a mechanism pivotally mounted at 35 on the casing of the power driven socket wrench, which mechanism utilizes a semi-5 circular yoke 36 around the drive shaft and sleeve. The exertion- 14 -of force on the release lever 34 is transmitted through the bearing to the sleeve which in turn transmits the force through a mechanism as described in Figs. 1-5 which provides a ready and quick means of releasing said socketsO
5Fig. 7 is a fragmentary sectional view of another embodiment in which the retainer ball 24 bears directly on the retainer ball 22 dispensing with the force transmission shaft.
Fig. 8 is a fragmentary sectional view of another embodiment in which multiple ball bearings 37 are utili~ed to transmit force 10from the control bar to the retainar ball.
Fig. 9 is a fragmentary sectional view in which cylindrical detent 38 is utilized, extsnding completely through the trans-verse bore.
Fig. 10 constitutes a perspective view of the device in its 15double locking configuration. Apparent in Fig. 10 are the common features including the sleeve and control bar 14. The sleeve is rearwardly extended over the driven end of the shank. The rear-ward travel is permitted by and limited by a ~ubstantially L-shaped slot 42 machined through the surface of the sleeve 15.
20Retention of the sleeve is accomplished through the use of a pin 43, placed within the slot 42 and fixedly mounted in the shank.
Fig. 11 is a fragmentary sectional view of the device in its double locking embodiment in the released configuration. The interior of the rearward extension of the sleeve 15 is provided 25with a recess or recesses 40 into which the driven end locking ,:
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ball 41 is carried, and permitted to retract in the release configuration. Further apparent is the locking slot 42, and pin 43. The operation of the driving end section, utilizing the detent 38, engaging a socket 21, acted upon by the control bar, is substantially the same as the other embodiments~
Fig. 12 is a fragmentary sectional view of the device in its double locking embodiment in the locked configuration. The detent 38 engages the recess in the socket 21. The downward or inward pressure of the sleeve 15 is exerted upon the driven end locking ball or detent 41 which detent itself mates with the standard detent of the driving member 45. Because the detent in the driving member 45.is spring loaded, it can be compressed below the driving surface by the locking ball or detent 41.
Fig. 13 constitutes an exploded view of the device showing the components in a disassembled configuration. Assembly and disassembly is generally accomplished through removal of the retainer pin 43.
The drawings in general and in various figures, illustrate a socket locking extension with a driven portion 11, extension shank 9, and square driving portion 12. The driving portion 12 fits into socket 21 for imparting rotational movement.
The shank 9 terminates at a shoulder 27 at the end of the shank 9. A control bar channel 10 is formed in the surface of the shank and extends into one positive locking and centering portion face or wall of the drive portion 11.

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A control bar 14 which has an outer portion 13 is carried in the control bar channel 10. A raised portion of spur 16 extends outward from the outer portion 13 and fits into sleeve 15. The sleeve has internal annular engagement elements or spurs 28,29. In preferred embodiments these constitute an inner annular ring and terminal annular ring of the sleeve 15 defining an angular groove 30 between them. This preferred embodiment does not foreclose the use of other methods of engagement. The forward motion of the sleeve toward the driving end is limited by a circular clip 18 as in prior embodiments. Rearward movement, however, is limited by a limiting collar 52 which engages the rear edge of the sleeve. In the preferred embodiment, the sleeve 15 may be covered with a frictional increasing surface pattern such as knurling or other arrangement making the sleeve easy to grip and retract.
Fig. 14 shows in exaggerated proportions the relationship of a two-ball detent arrangement in the locked position. The bearing ball 51 is supported in passage 53 in the shank 9 and engages the inward surface of control bar 14. Ball 51 engages the wall of the passage 53 and also engages retaining ball 55, forcin~ retaining ball 55 against the tapered end 57 of passage 53. The passage 53 is somewhat larger in diameter than the balls 51 and 55. As a result, the balls 51 and 55 do not line up and bearing ball 51 takes an eccentric position in the passage 53, 5 as illustrated in Fig. 14. The eccentric position of the ball i~ 132~7'~
51 results in a positive locking relationship between the balls.As the socket 21 is pulled away from the shank 9, a rotative moment is created in the retaining ball 55, tending to rotate ball 55 in a counter-clockwise direction in the view shown. As a result of the eccentric position of ball 51 jammingly pressed adjacent ball 55 the moment is received and transferred to the control bar 14 and the wall of the passage 53, providing enhanced locking action.
Fig. 15 is a sectional view of a preferred embodiment. The inner walls 31 of the socket 21 has a plurality of faces which engage the drive portion 12. Apparent in this view is a transverse bore 19 in which retainer balls 22 and 24 are carried.
The clearance between the retainer balls and bore are such that a slight off center condition results in a camming action. The control bar 14 carried in the control bar channel 10 extends forward or toward the distal end 95 (to the left). The outer portion 13 of the control bar engages the inner walls 31 when in the locked position. The inner sur~ace 50 of the control bar slides on the floor 60 of the channel 10. The inner surface 50 merges into a bevelled surface 25. It has been found in development that a bevel angle of approximately 10 degrees is preferable in this embodiment. For improved clearance and engagement of the socket, th tip o~ the control bar is also bevelled 51 adjacent to the outer portion 13.
Further apparent in this view are the engagement elements or spurs 28 and 29 which engage the outwardly extending spur 16 - 17a -.~ . .

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~32~73~1 of the control bar permitting retraction and imparting a forward (leftward~ force through the action of a compressed coil spring 17. As noted in connection with Fig. 14 forward and radially outward motion is limited by circular clip 18 snapped into groove 96 in the shank although other appropriate structures may be used.
As shown in Fig. 16, the spring 17 is compressed between the engagement element or spur 28 of the sleeve in the limiting collar 52 and an opposing edge of the limiting collar. The limiting collar itself is carried on the shank and has an inner surface 55A carried on a reduced diameter shank surface 56. The end 57A of the limiting collar engages a shoulder 58 formed at the intersection of the reduced diameter surface 56 and outer surface of the shank. The limiting collar further incorporates an outwardly extending shoulder 54 formed around its circum-ference which engages the rearward end 53A of the sleeve 15 at the rearward most extension of travel. This in turn retracts the control bar 14 and the retainer balls 22 and 24 are permitted by the movement of the bevelled surface 25 to disengage from the inner walls of the socket 21.
As shown in Fig. 18 the distance of travel permitted is less than the horizontal distance between the tip of the control bar 200 and the point where the bevelled surface 25 merges into the inner surface 50 of the control bar 14. As a result of this 5 arrangement in the locked position the retainer ball 22 continues -: - . ~ ,:

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to engage the bevelled surface 25. This may be compared to my patent 4,480,511 where the forward travel of the control bar and rearward travel of the control bar was such that the flat surface engaged the retainer ball.
As shown in Fig. 17 there are several advantages to this arrangement. In the environment where the tool is likely to be utilized and given the typical dimensions and clearances of standardized sockets, the sockets frequently become canted, twisted and otherwise misaligned under the forces exerted thereon. This may result in the jamming of the tool rendering it difficult to the release of the socket. Engagement of the retainer ball 22 cooperating with the socket engagement retainer ball 24 on the bevelled surface 25 reduces the tendency to jam.
Even slight retraction of the control bar 14 necessarily reduces the transverse dimension between the outer positive locking and centering portion 13 of the control bar 14 and the outermost point of the retainer of the retainer ball 24 thereby reducing any transverse pressure across the tool. The increased ease of release permits the use of closer tolerances in the tool which permit improved gripping force because of the coacting of rota tional and wedging forces in the respective components. When a socket engaging the retainer ball 24 and control bar outer por-tion 13 on opposite walls is pulled forward (leftward) friction from the wall which engages the retainer ball 24 will tend to impart a rotation clockwise. Near the point of tangency 1:

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(considering the slight off center alignment of the balls) and near the point diametrically opposed thereto, the retainer ball 24 engages the other retainer ball 22. The rotation of the first ball 24 imparts a counterclockwise rotation in the second ball 22 also shown by arrows. A lateral force is transferred to bevelled surface 25 and tends to impart a forward (leftward) motion to the control bar as shown by the arrow. This movement of the bar, because of the bevelled arrangement, tightens the engagement of the retainer ball 24 with the control bar surface.
Thus the bar is tightly wedged between the retainer ball 22 and socket walls. The inner walls 31 develop a tight frictional fit re~isting the pulling of the socket off the tool in its locked position.
This permits the utilization of sockets whose interior walls do not have the recesses designed to engage retainer ball 24 which were noted in prior art and my earlier inventions. In the field this provides increased utility as sockets may become worn, sockets may be produced with recesses on none of their inner walls 31 or sockets may be produced with recesses or equivalent structures on less than all of the walls as in the case of impact sockets. In this latter instance a retainer ball expected to engage a recess would only engage the socket if a transverse hole extending from the outer surface of the socket through to the interior surface of socket is lined up with the retainer ball.
This becomes cumbersome in the field and the present improved ., , - .. - ., .

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configuration permits the locking of said sockets even when flat walls are engaged by the retainer ball 24 and outer control bar surface 13.
Fig. 19 corresponds to Fig. 15 with the addition of a heli~
cal spring 61 interposed between retainer ball 24 and retainer ball 22. While in the released position the retainer balls are essentially free to move inward and outward within limits. A
reduced diameter 62 of the transverse bore limits outward movement in a direction opposite the control bar and movement toward the control bar is limited either by the control bar itself or by reducing the diameter by machining flanges or tapering the bottom of the transverse bore during drilling and before machining the control bar channel. This loose carriage of the retainer balls provides essentially negligible resistance to the forward movement of the socket.
In Fig. 20 it is shown that the placement of the spring exerts an outward force on the retainer balls. This outward force provides for increased resistance against the wall of or recess in the wall of the socket thereby reducing the likelihood of the socket falling of~ the tool when the control bar is retracted in the released position, either intensionally or accidently.
As illustrated in Fig. 17 and 18 the relative dimensions of retainer balls, spring and transverse bore diameter are such that in the locked position the retainer balls bear directly on one .;

1~ i32~73~

another resulting in the rotational and wedging action discussedwith reference to the previous Figures. The spring diameter is nearly equal to that of the bore and in the locked position the spring is nearly fully compressed so that any deformation of the balls permits a fully compressed spring to bear some of the load.
The use of the bevel or welding surface engagement described with reference to Fig. 15, Fig. 16, Fig. 17 and Fig. 18 and the use of the spring described in connaction with Fig. 17 and Fig. 18 provide the highest degree of utility in use.
Fig. 21 shows a sectional view of another embodimentO This view is analogous to Fig. 15 and 17 which show the device in the locked position. It will be noted toward rear (right) end of the control bar 14 the control bar inner surface 50 has been notched 65. Rearward (to the right) of the notch is a downwardly pro-jecting latch element 66 terminating along an extended imaginary line from the control bar inner surface 50. A second transverse bore or recess 68 which may constitute a blind bore extending partially downward from the control bar channel floor 60 is shown.
Fig. 22 shows this embodiment of the tool in the released position. The spring 61 acting through retainer ball 22 exerts an upward force on the tip of the control bar. This and the placement of the bore or recess 68 in the channel floor 60 permits the downward biasing of the rear end of the control bar and corresponding upward biasing of the tip of the control bar.

, ~ :
- --, - . -.

~ 132~73~

The downward biasing results in the engagement of the latching element 66 in the recess 68. Thus the mechanism is latched in the open position in this embodiment. This may be compared to other embodiments where the spring 17 always returns the mechanism to the locked position thus requiring retraction both to remove and to place a socket on the driving end 12 of the tool. Release of the mechanism from its latch position is accomplished by the forcing of retainer ball 24 against spring 61 at point "a", permitting further insertion of the socket.
Then the socket end 69 engages the tip 200 of the control bar when the socket is further moved on the tool at point "b" of Fig.
9. The angle of this permits unlocking of the control bar by causing the downward biasing of the tip and corresponding upward biasing of the rear end of the control bar to the point where the latching element 66 disengages from the recess 68. The pressure of the spring 17 thereby locks the mechanism. This provides semi-automatic action by holding the control bar in a socket release position until replacement of a socket causes locking action.
Fig. 23 shows an alternative embodiment of my inventionO
In this embodiment the securement portion of the tool is carried on a truncated body 80 of length limited to that necessary to carry the sleeve 15, provide for ~he stop limiting retraction of the sleeve and is adapted to reçeive the driving portion 81 of a second shank in corresponding recess 82 in the truncated body.

~ 132~73~

Operation of the retainer mechanism is otherwise unchanged from the alternative embodiments previously discussed. The recess for driving the truncated body by the second shank 83 is defined by walls that correspond to the driving portion 81 of the second shank 83.
The truncated body 80 is further attached to the second shank 83 in a semi-permanent manner through the insertion of a pin 84 in a hole 85 extending through one wall 86 of the truncated body's recess, through the driving portion 81 of the second shank 83 through the opposing wall 87 of the driven recess of the truncated body. This pin may be inserted and maintained in place by a compression fit thereby resulting in a unitary extension tool~ Alternatively a spring loaded pin permits adaptation to power driven extensions.
Fig. 24 shows an alternative truncated body arrangement.
In this arrangement the pin 84 is carried in a hole 88 in the driving portion 81 of the second shank 83. In this case the pin 84 is of a rivet head or inverted "T" shaped section and the neck of the hole 85 is reduced in diameter to retain the pin. A
spring 89 forces the pin outward and this permits easier removal by depressing the pin 84 with a suitable implement such as a probe, punch or the like. This is considered a semi-permanent affixation because of the retention of the pin and need for an implement to remove the truncated body 80.
The use of the arrangement in Fig. 10 and ll permits the use ~ 132~7~

of dissimilar alloy metals in the truncated body and second shank, the use of differential treatment as by heat treating of the respective truncated body and second shank and repair of either the truncated body or the second shank without requiring replacement of both. A further advantage is what production can be streamlined because of the previously mentioned material and heat treatment flexibility. Further, the truncated body-second shank arrangement permits adaptation of various length extensions which may be more easily conformed to specific consumer needs.
Fig. 25 and Fig. 26 shows another embodiment which provides semi-automatic retraction. In this embodiment the control bar 14 has a recess 101 placed in its tip 200. This recess includes a face 102 substantially parallel to the axis of the Gontrol bar 14 and forms a shoulder 103 perpendicular thereto. The shoulder is placed at such a position that as a socket is installed, the retainer balls are forced upward and the control bar tip 200 is biased upward so that it engages the base of the socket.
Continued movement of the socket causes partial retraction of the control bar 14 against the pressure of the spring 17. The socket 21 moves rearward (to $he right~ to the point where there is sufficient clearance between the inner walls 31 because of the reduced transverse dimension across the bevelled surface 25 that the control bar 14 may move to the locked position.

~ ............. : . '~ , :
, :~ .: - . . . .

Claims (11)

1. A wrench apparatus comprising:
a socket member;

an extension structure engaged with the socket member for rotating the socket member;

drive means engaged with the extension structure for rotating the extension structure and the socket member;

said extension structure comprising a shank member supported on the drive means for receiving rotative motion therefrom;

a control bar member supported on the shank member for longitudinal movement and generally radially outward movement with respect thereto between a locked position and a release position;
the socket member having a pair of opposing inner wall portions defining an opening in the socket member therebetween, said opening as defined by said inner wall portions receiving a portion of the shank member;

detent means supported on the shank member for movement with respect thereto into and out of a securement recess for selectively securing and releasing said shank member in said opening in said socket member; and said control bar member having an outward surface facing generally away from the shank member and an inward surface facing the shank member and being angled with respect to the longitudinal axis of the shank member;

said inward surface of the control bar member cammingly engaging the detent means when the control bar member is moved into the locked position to move said detent means into said securement recess for securing the socket member in engagement with the shank member;

the control bar member moving generally radially outwardly from the shank member said outward surface of the control bar member contacting the other of the inner wall portions of the socket member when the inward surface cammingly moves the detent means into engagement with the wall of the socket, whereby the socket member is generally centered on and secured to the extension structure.
2. A wrench apparatus comprising:

drive means;

an extension structure having a first portion engaged with the drive means for receiving rotative motion therefrom and a second portion distal to the first portion;

a socket member supported on the second portion of the extension structure;

the extension structure comprising:

a shank member having a recess therein receiving a portion of the drive means;

a sleeve member receiving the shank member therein;

the shank member having an opening therein communicating with the recess and with the sleeve member;

detent means supported for movement in the opening in the shank member;

said sleeve member being movable with respect to the shank member between a locked position and a released position;

said sleeve member selectively engaging the detent means and moving said detent means into the securement opening in the drive means when the sleeve member is moved to the locked position for securing the engagement structure to the drive means; and the extension structure having securement means thereon for selectively securing said socket member on the second portion of the extension structure;

the securement means securing said socket member to said second portion when the sleeve member is moved to the locked position, and releasing the socket member to be removed from the extension structure when the sleeve member is moved to the released position, whereby the drive means and the socket member are substantially simultaneously secured by movement of the sleeve member into the locked position and substantially simultaneously released by movement of the sleeve member into the released position.
3. A socket wrench tool comprising:
drive means;

a socket wrench extension engaged with the drive means for receiving rotational motion therefrom;

socket means having opposing walls defining an opening in said socket means, said opening receiving said socket engagement portion therein whereby the socket means receives said rotational motion from the extension;

said extension comprising:

a shank member supported on the drive means and extending generally longitudinally therefrom; and being connected with the socket engagement portion;

said shank member having an outer surface portion;

a control bar supported adjacent said outer surface portion of the shank member;

the outer surface portion having control bar guide means for guiding the control bar in generally longitudinal movement between a lock position and a release position;

(claim 3 continued) control bar retention means engaging the control bar and permitting the longitudinal movement of the control bar with respect to the shank member, said retention means limits radially outward movement of said control bar with respect to the shank member to maintain operative interaction of the control bar with the guide means;
detent means supported on the socket engagement portion for selective movement between a locked position where the detent means extends within the securement recess, to secure the socket means on the extension, and a release position where the detent is withdrawn from engagement with said walls and removal of the socket means form the exten-sion;
said control bar engaging the detent means and moving said detent means into the locked position thereof when the con-trol bar is moved into the lock position whereby said soc-ket wrench extension allows ready access to said control bar and guide means for maintenance, repair and replace-ment.
4. The invention according to Claim 3, and said guide means including wall means defining an outwardly disposed recess in said shank member receiving the control bar for movement therein.
5. In a tool for securement to socket members having variously spaced walls defining a securement opening, a tool having a securement structure for connecting such socket members for rotation therewith comprising:

a shank member adapted to be selectively entered within the securement opening;

a control bar member supported on the shank member for longitudinal movement with respect thereto to a locked position and a retracted release position and for generally radial movement on the shank member toward and away from an adjacent wall of a socket member for locking engagement therewith and release therefrom;

detent means supported on the shank member for movement transversely with respect thereto for selectively securing and releasing said shank member through said control bar member with respect to said socket member;

said control bar member having an outward surface facing generally away from the shank member and an acutely angled inward wedge surface facing the shank member;

said inward surface of the control bar member having a wedging surface cammingly engaging the detent means when the control bar member is moved into the locked position to move said detent means against a first wall of the socket member for securing the socket member in engagement with the shank member; and the control bar member moving generally radially outwardly from the shank member and said outward surface of the control bar member contacting another of the wall portions of the socket member within the opening therein coincident with the inward wedging surface cammingly moving the detent means to engage the first of the inner wall portions, whereby the socket member is generally centered on and secured to the securement structure.
6. The invention according to Claim 5, and wherein said detent means comprises a pair of retainer balls cammingly engaging each other into locking association with a wall of the member in opposition to the wall simultaneously engaged by the control bar member.
7. The invention according to Claim 6, and wherein said shank member has a driven end socket adapted to receive a driving element.
8. The invention according to Claim 7, and first and second motion limiting means and sleeve means mounted on the shank member; and said first limiting means limiting forward motion of the sleeve and control bar, and said second limiting means limiting of said bar and sleeve;

said control bar being movable radially, the radial outward movement being limited by said sleeve means, and means providing a recessed surface in said shank member limiting radially inward movement.
9. The invention according to Claim 8, and wherein said driving element comprises a second shank member with driving means complemental to said driven end of said first mentioned shank member; and said second shank member being semi-permanently attached to said first mentioned shank member.
10. The invention according to Claim 9, and engagement means for retracting said control bar; and for said socket member having retainer clearance means accommodating disengagement of said engagement means from said socket member.
11. The invention according to Claim 10, and said control and said shank having latch means and said control bar being adapted to engage and disengage said latch means.
CA000576565A 1988-09-06 1988-09-06 Locking socket wrench drive device Expired - Fee Related CA1325739C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA000576565A CA1325739C (en) 1988-09-06 1988-09-06 Locking socket wrench drive device
PCT/US1988/003057 WO1990002634A1 (en) 1988-09-06 1988-09-06 Locking socket wrench drive device

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3854001T DE3854001T2 (en) 1988-09-06 1988-09-06 LOCKING DEVICE FOR DRIVING A SOCKET SCREW.
EP88909489A EP0433284B1 (en) 1988-09-06 1988-09-06 Locking socket wrench drive device
AU26186/88A AU650231B2 (en) 1988-09-06 1988-09-06 Locking socket wrench drive device
CA000576565A CA1325739C (en) 1988-09-06 1988-09-06 Locking socket wrench drive device
PCT/US1988/003057 WO1990002634A1 (en) 1988-09-06 1988-09-06 Locking socket wrench drive device

Publications (1)

Publication Number Publication Date
CA1325739C true CA1325739C (en) 1994-01-04

Family

ID=4138679

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000576565A Expired - Fee Related CA1325739C (en) 1988-09-06 1988-09-06 Locking socket wrench drive device

Country Status (4)

Country Link
EP (1) EP0433284B1 (en)
AU (1) AU650231B2 (en)
CA (1) CA1325739C (en)
DE (1) DE3854001T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006041573B4 (en) * 2006-09-05 2011-07-28 Sui-Lan Lu Tie-rod device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399722A (en) * 1981-03-06 1983-08-23 Sardo Jr Vincent Socket wrench including quick-release adaptor
US4768405A (en) * 1981-05-04 1988-09-06 Qualicorp Ltd. Locking socket wrench drive device
US4480511A (en) * 1981-05-04 1984-11-06 Nickipuck Michael F Locking socket wrench drive device
US4537100A (en) * 1984-02-28 1985-08-27 Bernhard Palm Push-on/quick release locking arrangement for socket wrench extension
DE3705672A1 (en) * 1987-02-21 1988-09-01 Kloeckner Humboldt Deutz Ag Turning device

Also Published As

Publication number Publication date
EP0433284A4 (en) 1992-01-08
AU650231B2 (en) 1994-06-16
EP0433284A1 (en) 1991-06-26
EP0433284B1 (en) 1995-06-14
DE3854001D1 (en) 1995-07-20
DE3854001T2 (en) 1995-09-28
AU2618688A (en) 1990-04-02

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