US2732746A - Torque limiting screwdriver - Google Patents
Torque limiting screwdriver Download PDFInfo
- Publication number
- US2732746A US2732746A US2732746DA US2732746A US 2732746 A US2732746 A US 2732746A US 2732746D A US2732746D A US 2732746DA US 2732746 A US2732746 A US 2732746A
- Authority
- US
- United States
- Prior art keywords
- dimple
- barrel
- torque
- tool
- torque limiting
- 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 - Lifetime
Links
- 238000007906 compression Methods 0.000 description 6
- 210000001364 Upper Extremity Anatomy 0.000 description 4
- 230000004075 alteration Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000006011 modification reaction Methods 0.000 description 4
- 210000003414 Extremities Anatomy 0.000 description 2
- 210000003141 Lower Extremity Anatomy 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
- B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
- B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means
Definitions
- Figure 1 is a perspective view of the handle and tool receiving member.
- Figure 2 is a section taken along line 2-2 of Figure 1.
- Figure 3 is a fragmentary view of a screw-driverblade mounted.
- Figure 4 is a view similar to Figure 3, of a modified form of blade mounting.
- Figure 5 is a perspective view of the ball retainer and one of the dimple plates.
- the device has a hollow handle or barrel 10, which is threaded internally at both extremities. Screwed into the lower extremity of the barrel is a cap 12, which has a central bore 14 receiving tool holding member 16.
- the tool receiving member 16 has a bore 18 which receives the hexagonal portion of spindle 20, and has a smaller aligned bore 19 receiving the cylindrical projection 21.
- the spindle 20- is press fitted into the member 16 and projects into barrel 10.
- first dimple plate 22 which in this embodiment is press-fitted into a suitable recess in the cap.
- second dimple plate 24 which has a hexagonal bore preventing rotation relative to spindle 20.
- a retainer plate 26 is provided between the dimple plates 22 and 24 carrying a plurality of equal size balls 28 which fit into suitable dimples or recess in the dimple plates.
- the spindle 20 extends centrally through a spring 30 which receives the frusto-conical upper extremity of member 24 and bears against said member.
- a spring 30 which receives the frusto-conical upper extremity of member 24 and bears against said member.
- At the upper extremity spindle 20 has a knurled tip 32 which is press fitted into recess 34 of spring retaining member 36, which has a frusto-conical hub fitting into spring 30 and a flange 33 against which the spring bears.
- the spring retaining member 36 is centrally recessed to receive ball 38 which is peened into a recess 40 of adjusting screw 42 which is screwed into the upper end of the barrel 10.
- a cap 44 may be provided to screw into barrel 10 to cover the adjusting screw 42.
- the tool holding member 16 may be provided with a hexagonal bore 46 to receive the hexagonal base 48 of a tool, in this instance a screwdriver, as in Figure 3, or may be threaded as in Figure 4 to receive a threaded tool.
- the retainer plate 26 in this embodiment carries five balls 28.
- the members 22 and 24 are each provided with 20 recesses which receive the balls.
- the torque applied to the tool holder 16 must be sufficient to cause the balls 28 to climb out of the recesses 50 and thereby overcome the force of the spring 30. This causes member 24 to slide axially along spindle 20 a distance equal to the depth of recesses 50 so that the balls 28 may move from one of the recesses 50 into an adjacent recess 50.
- the torque may be varied.
- the range of torque which may be applied to the instrument is set by the adjusting screw 42 and the limits of the range set by the depth of the recesses in the members 22 and 24.
- a torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a plurality of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, means mounting the other dimple plate for axial sliding movement relative to said projecting element but preventing relative rotary movement therebetween, resilient means interposed between said flange shoulder and the latter said dimple plate, and adjustable thrust receiving means limiting axial movement of said flange shoulder under force of said resilient means.
- a torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a non-circular projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a circular series of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, the other dimple plate having a non-circular bore receiving said projecting element for axial'sliding movement relative thereto but preventing relative rotary movement therebetween, a compression spring interposed between said flange shoulder and the latter said dimple plate, and adjustable thrust receiving means limiting axial movement of said flange shoulder under force of said spring.
- a torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a circular series of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, means mounting theother dimple plate for axial sliding movement relative to said projecting element but preventing relative rotary movement therebetween, a compression spring interposed between said flange shoulder and the ice “ “9,789,740 a z r latter said dimple plate, a thrust receiving ball element limiting axial movement of said fiange shoulder under dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel,
Description
Jan. 31, 1956 F. w. LIVERMONT 2,732,746
TORQUE LIMITING SCREWDRIVER Filed Aug. 2, 1954 Un ed.
2,732,746 TORQUE LIMITING scnnwnnm Frank W. Livermont, Duarte, Calif. 7 Application Au uste, 1954,.Serial No. 447,114
4 Claims. c1. s1- s2'i4 This invention relates to an improved torque limiting tool.
It is an object of this invention to provide a tool such as a screwdriver wherein the blade will turn with respect to the handle when a preselected torque is applied.
It is a further object of this invention to provide means whereby the torque, which when applied causes the blade to turn with respect to the handle, may be readily varied.
It is a further object of this invention to provide novel means for determining the slipping torque which can be varied to change the torque range of the tool.
Other objects and advantages will be readily apparent from the following description.
In the drawings:
Figure 1 is a perspective view of the handle and tool receiving member.
Figure 2 is a section taken along line 2-2 of Figure 1.
Figure 3 is a fragmentary view of a screw-driverblade mounted.
Figure 4 is a view similar to Figure 3, of a modified form of blade mounting.
Figure 5 is a perspective view of the ball retainer and one of the dimple plates.
The device has a hollow handle or barrel 10, which is threaded internally at both extremities. Screwed into the lower extremity of the barrel is a cap 12, which has a central bore 14 receiving tool holding member 16. The tool receiving member 16 has a bore 18 which receives the hexagonal portion of spindle 20, and has a smaller aligned bore 19 receiving the cylindrical projection 21. The spindle 20- is press fitted into the member 16 and projects into barrel 10.
Mounted in cap 12 is a first dimple plate 22, which in this embodiment is press-fitted into a suitable recess in the cap. Slidably mounted upon spindle 20 is a second dimple plate 24 which has a hexagonal bore preventing rotation relative to spindle 20. Between the dimple plates 22 and 24 a retainer plate 26 is provided carrying a plurality of equal size balls 28 which fit into suitable dimples or recess in the dimple plates.
The spindle 20 extends centrally through a spring 30 which receives the frusto-conical upper extremity of member 24 and bears against said member. At the upper extremity spindle 20 has a knurled tip 32 which is press fitted into recess 34 of spring retaining member 36, which has a frusto-conical hub fitting into spring 30 and a flange 33 against which the spring bears.
The spring retaining member 36 is centrally recessed to receive ball 38 which is peened into a recess 40 of adjusting screw 42 which is screwed into the upper end of the barrel 10. A cap 44 may be provided to screw into barrel 10 to cover the adjusting screw 42.
The tool holding member 16 may be provided with a hexagonal bore 46 to receive the hexagonal base 48 of a tool, in this instance a screwdriver, as in Figure 3, or may be threaded as in Figure 4 to receive a threaded tool.
It is readily apparent that tightening of adjusting screw 42 compresses spring 30 requiring greater torque before tool holder 16 will turn with respect to handle 10. The amount of torque is controlled by the upper race 24 and lower race 22.
The retainer plate 26 in this embodiment carries five balls 28. The members 22 and 24 are each provided with 20 recesses which receive the balls.
To permit the tool holder 16 to rotate with respect to handle 10 the torque applied to the tool holder 16 must be sufficient to cause the balls 28 to climb out of the recesses 50 and thereby overcome the force of the spring 30. This causes member 24 to slide axially along spindle 20 a distance equal to the depth of recesses 50 so that the balls 28 may move from one of the recesses 50 into an adjacent recess 50.
By replacing one or both members 22 and 24 with other members having deeper or shallower recesses, the torque may be varied. Thus the range of torque which may be applied to the instrument is set by the adjusting screw 42 and the limits of the range set by the depth of the recesses in the members 22 and 24.
While what hereinbefore has been described is the preferred embodiment of this invention, it is readily apparent that alterations and modifications can be resorted to without departing from the scope of this invention and such alterations and modifications are intended to be included within the scope of the appended claims.
I claim:
1. A torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a plurality of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, means mounting the other dimple plate for axial sliding movement relative to said projecting element but preventing relative rotary movement therebetween, resilient means interposed between said flange shoulder and the latter said dimple plate, and adjustable thrust receiving means limiting axial movement of said flange shoulder under force of said resilient means. I
2. A torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a non-circular projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a circular series of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, the other dimple plate having a non-circular bore receiving said projecting element for axial'sliding movement relative thereto but preventing relative rotary movement therebetween, a compression spring interposed between said flange shoulder and the latter said dimple plate, and adjustable thrust receiving means limiting axial movement of said flange shoulder under force of said spring.
3. A torque limiting tool comprising in combination: a barrel, a coaxial tool holding member having a projecting element extending into said barrel, means providing a flange shoulder on the projecting end of said element, torque transmitting means encircling said element including axially spaced dimple plates each having a circular series of indentations, balls interposed between said dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel, means mounting theother dimple plate for axial sliding movement relative to said projecting element but preventing relative rotary movement therebetween, a compression spring interposed between said flange shoulder and the ice " "9,789,740 a z r latter said dimple plate, a thrust receiving ball element limiting axial movement of said fiange shoulder under dimple plates and extending into said indentations, means securing one of the dimple plates relative to said barrel,
means mounting the other dimple plate for axial sliding movement relative to :said non-circular shaft but-preventing relative rotary movement therebetween, a compression spring interposed between "said flange shoulder and the latter said dimple plate, and adjustable thrust receiving means within the barrel limiting axial movement of said flange shoulder under force of said spring.
References Cited. in the iile of this patent UNITE l) STATES PATENTS 1,881,633 Johnson Oct. 11, 1932 2,250,736 Torr'eseh July 29, 1941 2,396,040 Darling d Mar. 5, 1946
Publications (1)
Publication Number | Publication Date |
---|---|
US2732746A true US2732746A (en) | 1956-01-31 |
Family
ID=3442400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US2732746D Expired - Lifetime US2732746A (en) | Torque limiting screwdriver |
Country Status (1)
Country | Link |
---|---|
US (1) | US2732746A (en) |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857793A (en) * | 1955-06-08 | 1958-10-28 | Renault | Torque-limiting tool holder for machine tools |
US2927672A (en) * | 1957-04-15 | 1960-03-08 | Henry T M Rice | Automatically releasable torque transmitting apparatus |
US2945497A (en) * | 1956-05-15 | 1960-07-19 | Molins Machine Co Ltd | Driving arrangements for the tobacco hoppers of cigarette-making machines |
US2968979A (en) * | 1959-05-05 | 1961-01-24 | Sulo A Aijala | Predetermined torque release hand tool |
US2984133A (en) * | 1958-06-23 | 1961-05-16 | Milford S Zimmerman | Torque limiting screw driver |
US3034623A (en) * | 1956-07-30 | 1962-05-15 | Chicago Pneumatic Tool Co | Cam clutch device |
US3035675A (en) * | 1958-11-10 | 1962-05-22 | Sunbeam Corp | Overload clutch for power lawn mower |
US3451514A (en) * | 1967-12-04 | 1969-06-24 | Milwaukee Electric Tool Corp | Adjustable torque controlled release clutch for power driven tools |
US4242930A (en) * | 1979-04-27 | 1981-01-06 | A. B. Chance Company | Torque controlled clamp stick adapter |
US4613023A (en) * | 1983-11-05 | 1986-09-23 | Lucas Industries Public Limited Company | Device for limiting output force applied by a rotary transmission |
US4844177A (en) * | 1987-08-07 | 1989-07-04 | The Aro Corporation | Torque sensing, automatic shut-off and reset clutch for toggle controlled screwdrivers, nutsetters and the like |
US4880064A (en) * | 1987-11-05 | 1989-11-14 | The Aro Corporation | Torque sensing, automatic shut-off and reset clutch for screwdrivers, nutsetters and the like |
US4901610A (en) * | 1988-07-07 | 1990-02-20 | Precision Instruments, Inc. | Adjustable torque controlling mechanism |
US6450072B1 (en) | 2000-10-23 | 2002-09-17 | Honda Of America Mfg., Inc. | Clutch ball adjuster for tappet setting |
US6640674B1 (en) | 2002-05-21 | 2003-11-04 | Pilling Weck Incorporated | Screwdriver having a variable torque-limiting in-line drive |
US6832533B1 (en) * | 2003-07-30 | 2004-12-21 | Daniel Huang | Torque convertible adapter for driving tools |
US7052239B1 (en) * | 2003-06-27 | 2006-05-30 | Airmaster Fan Company | Oscillating fan clutch |
US20060179981A1 (en) * | 2004-02-11 | 2006-08-17 | Brian Cutler | T-handled torque-limiting driver |
US20060278051A1 (en) * | 2004-06-16 | 2006-12-14 | Gauthier Michael T | Torque-limiting mechanism |
US20070039425A1 (en) * | 2005-08-16 | 2007-02-22 | Wang Chun F | Screwdriver with torque setting mechanism |
US7503443B1 (en) * | 2006-05-02 | 2009-03-17 | Seekonk Manufacturing Company, Inc. | Torque control mechanism |
US20090078524A1 (en) * | 2007-09-20 | 2009-03-26 | Honeywell International, Inc. | Torque limiting devices for actuators |
US20150240857A1 (en) * | 2014-02-25 | 2015-08-27 | Chemseal, Inc. | Fastening apparatus having adjustable torque settings |
TWI504376B (en) * | 2012-08-14 | 2015-10-21 | Kabo Tool Co | Surgical torque screwdriver |
US20160311093A1 (en) * | 2012-08-30 | 2016-10-27 | Eca Medical Instruments | Base for disposable selectable torque limiting device |
US9555526B1 (en) | 2013-06-28 | 2017-01-31 | Gauthier Biomedical, Inc. | Selectively lockable torque-limiting mechanism |
US9731407B1 (en) | 2014-05-23 | 2017-08-15 | Dallas G. Edmisten | T handle torque wrench with slip function |
US10751862B1 (en) | 2014-05-23 | 2020-08-25 | Dallas G. Edmisten | T handle torque wrench with slip function |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881633A (en) * | 1926-09-03 | 1932-10-11 | Western Electric Co | Overload clutch |
US2250736A (en) * | 1939-12-19 | 1941-07-29 | Carel T Torresen | Torque wrench |
US2396040A (en) * | 1944-10-30 | 1946-03-05 | Frank L Darling | Screw driver |
-
0
- US US2732746D patent/US2732746A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1881633A (en) * | 1926-09-03 | 1932-10-11 | Western Electric Co | Overload clutch |
US2250736A (en) * | 1939-12-19 | 1941-07-29 | Carel T Torresen | Torque wrench |
US2396040A (en) * | 1944-10-30 | 1946-03-05 | Frank L Darling | Screw driver |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857793A (en) * | 1955-06-08 | 1958-10-28 | Renault | Torque-limiting tool holder for machine tools |
US2945497A (en) * | 1956-05-15 | 1960-07-19 | Molins Machine Co Ltd | Driving arrangements for the tobacco hoppers of cigarette-making machines |
US3034623A (en) * | 1956-07-30 | 1962-05-15 | Chicago Pneumatic Tool Co | Cam clutch device |
US2927672A (en) * | 1957-04-15 | 1960-03-08 | Henry T M Rice | Automatically releasable torque transmitting apparatus |
US2984133A (en) * | 1958-06-23 | 1961-05-16 | Milford S Zimmerman | Torque limiting screw driver |
US3035675A (en) * | 1958-11-10 | 1962-05-22 | Sunbeam Corp | Overload clutch for power lawn mower |
US2968979A (en) * | 1959-05-05 | 1961-01-24 | Sulo A Aijala | Predetermined torque release hand tool |
US3451514A (en) * | 1967-12-04 | 1969-06-24 | Milwaukee Electric Tool Corp | Adjustable torque controlled release clutch for power driven tools |
US4242930A (en) * | 1979-04-27 | 1981-01-06 | A. B. Chance Company | Torque controlled clamp stick adapter |
US4613023A (en) * | 1983-11-05 | 1986-09-23 | Lucas Industries Public Limited Company | Device for limiting output force applied by a rotary transmission |
US4844177A (en) * | 1987-08-07 | 1989-07-04 | The Aro Corporation | Torque sensing, automatic shut-off and reset clutch for toggle controlled screwdrivers, nutsetters and the like |
US4880064A (en) * | 1987-11-05 | 1989-11-14 | The Aro Corporation | Torque sensing, automatic shut-off and reset clutch for screwdrivers, nutsetters and the like |
US4901610A (en) * | 1988-07-07 | 1990-02-20 | Precision Instruments, Inc. | Adjustable torque controlling mechanism |
US6450072B1 (en) | 2000-10-23 | 2002-09-17 | Honda Of America Mfg., Inc. | Clutch ball adjuster for tappet setting |
US6640674B1 (en) | 2002-05-21 | 2003-11-04 | Pilling Weck Incorporated | Screwdriver having a variable torque-limiting in-line drive |
US7052239B1 (en) * | 2003-06-27 | 2006-05-30 | Airmaster Fan Company | Oscillating fan clutch |
US6832533B1 (en) * | 2003-07-30 | 2004-12-21 | Daniel Huang | Torque convertible adapter for driving tools |
US20060179981A1 (en) * | 2004-02-11 | 2006-08-17 | Brian Cutler | T-handled torque-limiting driver |
US7272999B2 (en) | 2004-02-11 | 2007-09-25 | Snap-On Incorporated | T-handled torque-limiting driver |
US7650821B2 (en) * | 2004-06-16 | 2010-01-26 | Gauthier Biomedical Inc. | Torque-limiting mechanism |
US20060278051A1 (en) * | 2004-06-16 | 2006-12-14 | Gauthier Michael T | Torque-limiting mechanism |
US7272998B1 (en) * | 2004-06-16 | 2007-09-25 | Gauthier Michael T | Torque-limiting mechanism |
US20080016991A1 (en) * | 2004-06-16 | 2008-01-24 | Gauthier Michael T | Torque-Limiting Mechanism |
US20070039425A1 (en) * | 2005-08-16 | 2007-02-22 | Wang Chun F | Screwdriver with torque setting mechanism |
US7222559B2 (en) * | 2005-08-16 | 2007-05-29 | Chun Fu Wang | Screwdriver with torque setting mechanism |
US7503443B1 (en) * | 2006-05-02 | 2009-03-17 | Seekonk Manufacturing Company, Inc. | Torque control mechanism |
US20090078524A1 (en) * | 2007-09-20 | 2009-03-26 | Honeywell International, Inc. | Torque limiting devices for actuators |
US7766751B2 (en) | 2007-09-20 | 2010-08-03 | Honeywell International Inc. | Torque limiting devices for actuators |
TWI504376B (en) * | 2012-08-14 | 2015-10-21 | Kabo Tool Co | Surgical torque screwdriver |
US20160311093A1 (en) * | 2012-08-30 | 2016-10-27 | Eca Medical Instruments | Base for disposable selectable torque limiting device |
US10730171B2 (en) * | 2012-08-30 | 2020-08-04 | Eca Medical Instruments | Base for disposable selectable torque limiting device |
US9555526B1 (en) | 2013-06-28 | 2017-01-31 | Gauthier Biomedical, Inc. | Selectively lockable torque-limiting mechanism |
US20150240857A1 (en) * | 2014-02-25 | 2015-08-27 | Chemseal, Inc. | Fastening apparatus having adjustable torque settings |
US9731407B1 (en) | 2014-05-23 | 2017-08-15 | Dallas G. Edmisten | T handle torque wrench with slip function |
US10751862B1 (en) | 2014-05-23 | 2020-08-25 | Dallas G. Edmisten | T handle torque wrench with slip function |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2732746A (en) | Torque limiting screwdriver | |
US2983121A (en) | Torque control means | |
US9566695B2 (en) | Screw driving device with adjustable countersink depth | |
US2984133A (en) | Torque limiting screw driver | |
US2558158A (en) | Safety tool handle | |
US3982747A (en) | Ski pole | |
US3508455A (en) | Combination tool | |
US4762035A (en) | Depth adjusting device for screwdrivers | |
US3001430A (en) | Predetermined torque release tool | |
US2708836A (en) | Adjustable drive clutch | |
US3874752A (en) | Synthetic resin-made bearing | |
US2701432A (en) | Simplified indexing grinding fixture | |
US2731865A (en) | Predetermined torque release socket | |
US2606431A (en) | Adjustable drive clutch for regulating the torque imparted to a driven member | |
US3061869A (en) | Control knobs | |
US3076362A (en) | Torque wrench | |
US5337634A (en) | Laterally adjustable socket with means for providing visible indication of socket operating position | |
US2974503A (en) | Torque limiting device | |
US2844375A (en) | Adjustable grip for bowling ball | |
US2409545A (en) | Torque wrench | |
US8479620B2 (en) | Torque-setting device | |
US10751862B1 (en) | T handle torque wrench with slip function | |
US2831383A (en) | Predetermined torque release hand tool | |
US2989881A (en) | Multiple use hand tool having a ratchet handle | |
US3626768A (en) | Tool drive assembly |