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Publication numberUS2826107 A
Publication typeGrant
Publication dateMar 11, 1958
Filing dateFeb 6, 1956
Priority dateFeb 6, 1956
Publication numberUS 2826107 A, US 2826107A, US-A-2826107, US2826107 A, US2826107A
InventorsGlen Woods Robert
Original AssigneeGlen Woods Robert
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ratcheting torque-limiting wrench
US 2826107 A
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Description  (OCR text may contain errors)

March 11, 1958 R. G. wooDs 2,826,107

RATCHETING TORQUE-LIMITING WRENCH Filed Feb. 6, 1956 ROBERT GLEN Woons INVENTOR.

BY fwm, 4

A TTOFE/VEUS 2,826,107 RATQHETHNG TORQUE-LIMITlNG WRENCH Robert Glen Woods, Huntington Park, Calif. Application February 6, 1956, Serial No. 563,657 6 Claims. (Cl. 81-52.4)

The present invention relates generally to wrenches and more particularly to an improved form of ratcheting torque-limiting Wrench.

Torque-limiting wrenches of various types are widely employed in many industries; Generally, these torquelimiting wrenches include a load-engaging member and a spring which resists the movement of the load-engaging member until the desired limited amount of torque is applied to the load thereby. The application of such limited amount of torque to the load through the load-engaging member causes the latter to undergo movement from its original position against the force of the spring. Such movement provides an indication that the desired limited amount of torque has been applied to the load.

It is a major object of the present invention to provide a torque-limiting wrench which incorporates ratcheting.

Another object of the invention is to provide a ratcheting torque-limiting wrench which is both accurate and foolproof in use.

A further object is to provide a ratcheting torque-limiting wrench which is compact in size and light of weight having but few working parts.

An additional object is to provide a ratcheting torquelirniting wrench which is simple in design and rugged of construction whereby it may afford a long and troublefree service life.

Another object is to provide a ratcheting torque-limiting wrench wherein the amount of torque applied by said wrench may be accurately adjusted.

Yet a further object is to provide a ratcheting torquelimiting wrench which will afiord uniform results over its entire service life.

These and other objects and advantages of the present invention will become apparent from the following detailed description of a preferred embodiment thereof, when taken in conjunction with the appended drawings, wherein:

Figure 1 is a central vertical sectional View of a preferred form of ratcheting torque-limiting wrench embodying the present invention;

Figure 2 is a horizontal sectional view taken on line 2-42 of Figure 1;

Figure 3 is a fragmentary enlarged vertical sectional view taken on line 3-6 of Figure 2; and

Figure 4- is an enlarged sectional view of a detail of the ratcheting mechanism of said wrench.

Referring to the drawing, the preferred form of ratcheting torque-limiting wrench embodying the present invention broadly comprises a generally T-shaped handle ill wherein is carried a vertically extending load-engaging member 12. A collar member 14 is journaled by the upper end of the load-engaging member 12 and a ratcheting mechanism, generally designated 16, is interposed between the load-engaging and collar members whereby they may undergo concurrent rotation in one direction but not in the other. The collar member 14, and hence the loadengaging member 12, is normally locked against rotation relative to the handle by torque-limiting means, to be fully described hereinafter. When the amount of torque exerted upon the load exceeds a predetermined amount, the collar and load-engaging members will undergo limited rotation relative to the handle 10 so as to provide an indication that the desired amount of torque has been applied to the load.

More particularly, the handle 10 is of integral construction and includes a vertical leg 26 and a pair of integral, horizontal arms 22 and 24. The vertical leg 20 is formed with a coaxial vertical bore 26. This bore 26 intersects a pair of horizontal bores 28 and 30 formed in the arms 22 and 24, respectively. The outer portions of the bores 28 and 30 are of enlarged diameter and are internally threaded so as to receive cylindrical plugs 32 and 34, respectively. The upper portion of the handle it? is coaxially formed with an internally threaded bore 36 of larger diameter than the vertical bore 26. This bore 36 threadedly receives a cap 38.

The load-engaging member 12 is of cylindrical configuration throughout the major portion of its length. The lower end of this member 12 protrudes from the vertical leg 29 of the handle it) and this exposed portion is formed with a square shank 40 adapted to be removably inserted within a complementary socket formed in a nut, bolt or other element constituting the load (not shown). It should be particularly observed, however, that the load contacting portion of the load-engaging member may take various other forms without departing from the spirit of the present invention. The upper end of the load-engaging member 12 is aligned with the bores 28 and 30 of the arms 22 and 24. With reference to Figures 3 and 4, it will be observed that the portion of the load-engaging member 12 disposed within these bores is formed with a radially extending passage 42. A small ball bearing 44 is interposed between the upper end of the load-engaging member 12 and the underside of the cap 38. This ball bearing 44 is positioned within a complementary depression 46 formed in the upper end of the load-engaging member. A snap ring 47 restrains the load-engaging member against downward movement.

The coilar member 14 is journaled by the upper portion of the load-engaging member 12. The inner periphery of the collar member 14 is formed with ratchet teeth 48. The outer periphery of the collar member is formed with a plurality (preferably four) of annular cavities fill, 52, S4 and 56. These cavities extend the height of the collar member. The ratchet mechanism 16 includes a small, generally rectangular latch element 58 which is radially, slidably disposed within the passage 42 formed in the upper portion of the load-engaging member 12. A small helical compression spring 6% disposed rearwardly of the latch element 58 constantly urges it radially outwardly. The radially outer end of the latch element as is beveled to a profile approximating that of the ratchet teeth 43, as indicated in Figure 4. With this arrangement, and referring to Figures 2 and 4, clockwise rotation of the load-engaging member 12 will be transferred to the collar member it through the ratchet mechanism 16, the front end of the latch element 58 abutting the shallow side of the ratchet teeth 4-8. Upon counterclockwise rotation of the load-engaging member relative to the collar member, however, the long side of the ratchet teeth 48 will cam the latch element 58 radially inwardly whereby the collar member 14 will remain stationary while the load-engaging member rotates relative thereto.

A pair of guides 62 and 64 are fixedly secured within the bores 2;? and 3d of the arms 22 and 24, respec tively, radially outwardly of the collar member 14. The guides are formed with passages 66 and 67, respectively, which slidably carry a pair of plnngers oh and 70 for radial movement relative to the handle iii. A pair of helical compression springs 72 and 74 are interposed be-f tween the outer ends of these plungers and the inner ends of the plugs 32 and 34. A pair of rollers 76 and 78 These rollers 76 and 78 have a diameter approximating that of the arcuate cavities '0, 52, 54 and 56.

n the operation of the aforedescribed device, the rollers 76 and '78 will normally be restrained against radially outward movement from within the arcuate cavities Sit and 54 by the spring-urged plungers 6S and 7t {\ssumrng the wrench is being rotated in a clockwise directron relative to Figures 2 and 4, when the torque being exerted by the wrench exceeds a predetermined amount,

engaging and collar members, the rollers dropping into This limited amount scope of the following I claim:

claims.

outer periphery; unidirectional drive means interconnectmg said load-engaging 2. A ratcheting torque-limiting Wrench, comprising: a handle; a load-engaging member rotatably carried by said handle; a tubular collar member coaxially journaled by being formed with ratchet teeth; a radially movable ratchet element slidably disposed within a trans having a diameter approximating that of said cavity partially d sposed therewithin; guide means in said handle permitting radial movement of said roller relative to wardly towards said annular element.

3. A ratcheting torque-limiting wrench, comprising: a handle having a vertical leg and a horizontal arm, said vertical leg being formed with a vertical bore and said arm being formed with a horizontal bore which intersects the upper end of said vertical bore; a vertically extending elongate load-engaging member disposed within said vertical bore with its upper portion intersecting said horizontal bore and its lower end protruding through the lower end of said vertical leg; a tubular collar member journaled by the upper portion of said load-engaging member; a ratchet mechanism interposed between said collar member and the upper portion of said load-engaging member for effecting concurrent rotation of said loadengaging member and said collar member in one direction but not in the other; a roller in said handle partially disposed within a complementary cavity formed in the outer periphery of said collar member; and torque-limiting means interposed between the outer end of said roller and the outer portion of said horizontal arm.

4. A ratcheting torque-limiting wrench, comprising: a generally T-shaped handle having a vertical leg and a pair of horizontal arms at the upper end thereof, said vertical leg being formed with a vertical bore and said horizontal arms each being formed with a horizontal bore intersecting the upper end of said vertical bore; a vertically extending elongate load-engaging member rotatably disposed within said vertical bore with its upper portion intersecting said horizontal bores and its lower end protruding through the lower end of said vertical leg; a tubular collar member coaxially journaled by the upper portion of said load-engaging member, the outer periphery of said collar member being formed with a plurality of arcuate cavities, opposite ones of pairs of said cavities facing the outer end of each of said horizontal bores, and the inner periphery of said collar member being formed with ratchet teeth; a ratchet element carried by said loadengaging member and cooperating with said ratchet teeth in effecting concurrent rotation of said load-engaging member and said collar member in one direction but not in the other; a roller in each of said arms, each roller having the same diameter as said cavities and being seated in one of said cavities; a pair of plungers each disposed within one of said horizontal bores outwardly of said collar member for movement towards and away from said collar member, the inner end of said plungers abutting said rollers so as to normally restrain them against movement out of said cavities; and resilient means interposed between the outer end of each of said plungers and the outer ends of each of said horizontal arms for biasing said plungers toward said rollers.

5. A ratcheting torque-limiting wrench, comprising: a handle; a load-engaging member rotatably carried by said handle; a collar journaled by said member having a substantially semicylindroid cavity formed in its outer periphery; unidirectional drive means interconnecting said collar and member; a cylindrical roller element having a diameter approximating that of said cavi y and partially disposed within said cavity; a plunger slidably carried by said handle for movement towards and away from said element; guide means in said handle rotatably mounting said element and confining linear movement of said element to a path in alignment with the axis of said handle; and resilient means interposed between said plunger and handle to bias said plunger against said element to yieldably seat said element in said cavity,

6. A ratcheting torque-limiting wrench, comprising: a generally T-shaped handle having a vertical leg and a pair of horizontal arms at the upper end thereof, said vertical leg being formed with a vertical bore and said horizontal arms each being formed with a horizontal bore intersecting the upper end of said vertical bore; a vertically extending load-engaging member rotatably disposed within said vertical bore with its upper portion intersecting said horizontal bores and its lower end protruding through the lower end of said vertical leg; a snap ring seated in the vertical bore of said handle that engages said load-engaging member to restrain said load-engaging member against axial movement in said vertical bore; a

tubular collar coaxially iournaled by the upper portion of said load-engaging member, the outer periphery of said collar being formed with a plurality of substantially semicylindroid cavities that are arranged in diametrically opposite pairs facing the outer end of each of said hori zontal bores, and the inner periphery of said collar being formed with ratchet teeth; a latch radially slidably mounted in the upper end of said load-engaging member for cooperative engagement with said ratchet teeth in effecting concurrent rotation of said load-engaging member and said collar in one direction but not in the other; a helical spring in the upper end of said loadengaging member that yieldably biases said latch to engagement with said ratchet teeth; a substantially tubular guide rigidly affixed in each of said horizontal bores at the radially inner end thereof; a cylindrical roller slidably disposed in each of said guides, each roller having the same diameter as said cavities and being seated in one of said cavities; a pair of plungers each of which is slidaoly disposed within one of said guides outwardly of said collar for movement towards and away from said collar, the inner end of said plungers abutting said rollers so as to normally restrain them against movement out of said cavities; a pair of plugs each of which threadedly engages the outer end of one of said horizontal bores to provide a spring seat; and a pair of compression springs each of which is enclosed within one of said horizontal bores between said plug and the outer end of one of said plungers for biasing said plungers toward said rollers to yieldably seat said rollers in diametrically opposed cavities.

References Cited in the file of this patent UNITED STATES PATENTS 1,860,871 Pouliot May 31, 1932 2,157,574 Siesel May 9, 1939 2,159,373 Dunn May 23, 1939 2,358,461 Latimer Sept. 19, 1944 2,503,499 Livermont Apr. 11, 1950 2,601,044 Mayer June 17, 1952 2,601,799 Garwood July 1, 1952 2,768,547 Noell Oct. 30, 1956 FOREIGN PATENTS 965,788 France Feb. 22, 1950

Patent Citations
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US1860871 *Nov 6, 1930May 31, 1932Wilfred A PouliotSafety wrench
US2157574 *Nov 19, 1937May 9, 1939Siesel William MTorque release wrench
US2159373 *Apr 10, 1937May 23, 1939Cedar Rapids Eng CoTorque wrench
US2358461 *Oct 28, 1942Sep 19, 1944Latimer Charles APressure releasable wrench
US2503499 *Mar 20, 1945Apr 11, 1950Richmont IncTorque wrench
US2601044 *Jan 6, 1949Jun 17, 1952Mayer William HTorque wrench
US2601799 *Jan 18, 1951Jul 1, 1952George C JenkinsPredetermined torque release wrench
US2768547 *Apr 28, 1954Oct 30, 1956Printing Machinery CompanyPredetermined torque release hand tool
FR965788A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2912889 *Feb 5, 1958Nov 17, 1959George C JenkinsPredetermined torque release wrench
US2919602 *Oct 2, 1958Jan 5, 1960Automatic Locking Devices IncProtective knob unit
US2948173 *Apr 15, 1959Aug 9, 1960Herrmann Paul FHand tool with adjustable torque release
US2972271 *Nov 27, 1959Feb 21, 1961Apco Mossberg CompanyPredetermined torque release hand tool
US3267775 *Dec 17, 1962Aug 23, 1966Vashti Y HoltAdjustable torque tool having predetermined overload yielding means
US3529498 *Feb 5, 1969Sep 22, 1970James E NorthcuttPower wrench
US3670620 *Nov 23, 1970Jun 20, 1972Us NavyAutomatic sway brace device
US5150851 *Feb 2, 1991Sep 29, 1992Pelikan AktiengesellschaftClutch for tape dispenser
US5337971 *Mar 31, 1993Aug 16, 1994Eastman Kodak CompanyTorque transmission clutch for film spool
US5643089 *Oct 19, 1995Jul 1, 1997Scott R. HummelNon-jarring torque wrench with removable output shaft
US5694629 *May 1, 1995Dec 2, 1997Eastman Kodak CompanyFilm transport mechanism with torque limiting clutch
US6662693 *Dec 27, 2001Dec 16, 2003Bobby HuWrench with a fixed maximum operational torque
US6666117 *Oct 15, 2001Dec 23, 2003Bobby HuWrench with a fixed maximum operational torque
US6701813Jan 7, 2002Mar 9, 2004Bobby HuWrench with a fixed maximum operational torque
US6752050Jan 7, 2002Jun 22, 2004Bobby HuWrench with a fixed maximum operational torque
US6752051Jan 7, 2002Jun 22, 2004Bobby HuWrench with a fixed maximum operational torque
US6766718 *Jan 7, 2002Jul 27, 2004Bobby HuWrench with a fixed maximum operational torque
US6886434May 22, 2003May 3, 2005Bobby HuWrench with a fixed maximum operational torque
US7272999Feb 11, 2005Sep 25, 2007Snap-On IncorporatedT-handled torque-limiting driver
US7281457 *Jan 11, 2006Oct 16, 2007Bobby HuWrench with adjustable maximum operational torque
US7430945 *May 17, 2007Oct 7, 2008Gauthier Biomedical Inc.Ratcheting torque wrench
US7913594 *Sep 30, 2008Mar 29, 2011Gauthier Biomedical, Inc.Ratcheting torque wrench
US7942253 *May 23, 2006May 17, 2011K2M, Inc.Thumb-actuated handle device
EP1847354A1 *Apr 18, 2006Oct 24, 2007Wun-Sin WuTorque wrench
WO2004048044A1 *Nov 26, 2003Jun 10, 2004Gasser DanielDevice for manually screwing in, tightening and releasing fixing means with internal and/or external engagement
Classifications
U.S. Classification81/480, 464/37, 192/55.1, 192/46
International ClassificationB25B23/14, B25B13/46, B25B23/142, B25B23/143, B25B13/00
Cooperative ClassificationB25B23/1427, B25B13/465
European ClassificationB25B13/46B1C, B25B23/142B2