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Publication numberUS3170322 A
Publication typeGrant
Publication dateFeb 23, 1965
Filing dateJun 5, 1962
Priority dateJun 5, 1962
Publication numberUS 3170322 A, US 3170322A, US-A-3170322, US3170322 A, US3170322A
InventorsRonald C Cavanaugh
Original AssigneeInstron Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3170322 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Feb. 23, 1965 R. c. CAVANAUGH 3,170,322


Filed June 5, 1962 Filed June 5, 1962, Ser. No. 200,201 1 Claim. (Cl..73'-103) This invention 'relatesto grip useful inmaterials testing.

One object of thepresent invention is to provide such a grip in which the forces exerted on a specimen held in the grip may be effectively multiplied with respect to the input actuating forces, in an amount which may be predetermined over a very wide range. Other objects are to provide sucha grip in which jaws move-together transversely against opposed sides of a specimen free from any component of movement longitudinally of the specimen; in which each opposed jaw face is at all times the same distance from a plane including the centerline of a specimen in testing position; in which each jaw face is at United States Patent ,7 3,170,322 Patented Feb. 23, 1965 the lower surface of the piston portion of the'actuator. Held in the closure 48 against-vertical movement relative thereto by pin 58 is mounting element 60 which includes hole mounting 62 the center of which is on the vertical centerline 32. Air pressure may be selectively admitted through hose connection 64 andholes 66 and 68 into the zone 70 above the actuator36 and into the cylinder portion of the housing 10, to drive the actuator downwardly with a force determined by the product of the air pressure and the area-of the topsurface 74 of the actuator.

The lower ends of axially movable (axially of themselves, of course; not of the grip as a whole) links 24 all times maintained with its points for contacting a specimen defining planes parallel to said plane including the ing and opposed pairs of wedging or camming surfaces on an axially movable actuator, a corresponding pair of links with endsbiased against the camming surfaces centerline of a specimen in testing position; and which for movement by the actuator, and a corresponding pair A of intermediately pivotally mounted links secured at corresponding ends to the first-mentioned links and at opposed corresponding ends to a pair of oppositely coaxially movable jaw carriers.

Other objects, features and advantages will appear from the following description of a preferred embodiment of the invention, in conjunction with the attached drawings thereof, in which:

FIG. 1 is a side elevational view, partially in section, of said preferred embodiment; and

FIG. 2 is an end elevation thereof.

Referring now to the drawings, there is shown a frame 18 which includes an upper cylinder portion 12 and lower leg portions 14. The leg portions,14 each include slots 16, which are interrupted toward their lower ends by widened portions defining jaw-carrier bearings 18 square in cross-section, and toward their upper ends by widened portions defining slanted holes 20 in which are carried bearings 22 for axially movable links 24. The

, upper ends of the links 24 carry rollers 26 mounted rotataupper piston portion 38 of the actuator 36 includes a a groove in which is seated ring gasket 48 which provides a seal between said piston portion and the cylinder portion 12 of frame 10. The frame 10 includes a reversely directed annular portion 44 supporting actuator bearing 46.. Mounted on top of the frame and interiorly depending thereinto is closure 48, with ring gasket 50 mounted in the annular space therebetween in a groove around dependent portion 154thereof for sealing purposes. The actuator 36 is yieldingly urged at all times toward the closure 48, and held thereagainst when the actuator is not actuated, by spring 56 extending from the frame to include therethrough pins 76. which extend also through upper holes 78 0f intermediately pivotally mounted (on pins 80 secured in the frame 10) links 82 containing .toward their lower ends holes 84. Theholes 76' and84 are elongated in a direction longitudinal of the link 82 to accommodate the vertical movement relative to ea ch other of the outer ends of the links 24 and the jaw car riers 86, the latter of' which carry pins 88 passing through the elongated holes 84. The jaw carriers 86. are square in cross-section and movable in horizontal bearing 18, so that they are given horizontal non-rotating movement toward each other in use. Each carrier 86 includes a slot 90, said slots being oppositely directed and one being ro-' tated 90 from the other. Each slot carries shank 92 of a jaw 94, held in place by a pin 96. The jaws 94 and their faces 98 (which may be smooth or knurled or toothed, but which in any event are substantially verticallyplanar areas defined by and constituting the locus of all the specimen-engaging jaw extremities, whether the latter are for example tips of teeth or points on smooth surfaces) are at all times equidistant from centerline 32. The lower ends of pivotally mounted links 8-2 are outwardly urged by leaf springs 100 resting against the inner surfaces of slots 16.

In operation, air under pressure is introduced through floating piston action. The wedging surfaces 34 thereupon force apart sliding links 24, the rollers 26 rolling along the wedging surfaces. The pivoted links 82 are thereby rotated about pins 80 to drive together the jaw carriers 86 and jaws 94.

In the embodiment shown, the pin 80 is equidistant between the holes 78 and 84, so that the force exerted on each jaw carrier 86 through its pin 88 is substantially equal to the horizontal component of the force exerted by the sliding links 24 on the upper ends of the links 82. An advantage of the invention is that it provides for mov-' ing the pin about which the pivotally mounted link is mounted closer to either the upper or lower end of the pivotally mounted jlink,.to respectively produce either greater movement and less force in the jaw carriers and jaws or less movement and greater force in the jaw carriers and jaws. The relationship between force exerted on the actuatorand force exerted at (and movement of) the jaws may be advantageously varied alsoby altering the angle the wedging surfaces define with a vertical plane through centerline 32 parallel with the faces 98.

crease relative to actuator force, and, of course, the reverse.

angle for a portion of their extent and then at another angle, to vary jaw force and movement at different stages 7 continuous change in the movement-force relationship If desired, the wedging surfaces may be at one" between the actuator and theja'ws. The expression cam surfaces is used herein to include both planar wedging surfaces and non-planar cam surfaces.- If desired, the actuator may be driven mechanically, as by a screw or toggle, rather than by air pressure. The use of air pressure provides the advantages-of jaw follow-up and constant gripping forces even though specimen thickness diminishes during a test; of facilitating delicate and accurately regulated gripping of-fragile or sensitive specimens; and increasedcontrol of rate of jaw opening and closing.

Leaf springs 100 operating on links 82 drive the jaws away from each other when air pressure is released,spring 56 driving the actuator outward to override its jaw-closing,

action. Thus a specimen may be removed and another inserted. c

Other embodiments Within the invention and the appended claim will occur to those skilled in the art.

Iclaim: I

A grip comprising a frame with an upper cylinder portion, a pair of dependent leg portions, and a reversely directed portion extending upwardly into said cylinder portion, an actuator mounted in said cylinder portion for slidable movement axailly of said grip Within said reversely directed portion, said actuator including an upper piston portion for cooperation with said cylinder portion to be driven therealong by air pressure thereabove and a pair of wedging surfaces defining equal acute angles with the axis of said grip, a closure above said piston portion and secured in sealed relation to said frame, a mounting element secured in said closure and extending thereabove, said mounting element and said closure including cooperating passages for air under pressure, spring means cooperating with said frame and biasing said piston portion toward said closure, a first pair of links mounted for slidable movement in said frame, each said link being slidable axially of itself and in a direction perpendicular to one of said wedging surfaces; a roller rotatably mounted in the inner end of each of said first pair of links and engaging one of said Wedging surfaces, a second pair of links eachhaving. its upper end pivotally secured to an outer end of one of said first pair of links and being pivotally mounted intermediately of itself in said frame, a pair of jaw carriers mounted for coaxial slidable movement only in said frame in opposite directions along a line' perpendicular to said axis of said grip, each said jaw carrier being pivotally joined at an outer end to a lower end of one of said second pair of links, a pair of jaws with faces parallel toeach other and to the grip axis, and springmeans cooperating with said frame and biasing outwardly the lower ends of said second pair of links. 7

References (Iited in the file of this patent UNITED STATES PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1797836 *Nov 7, 1929Mar 24, 1931Edmond PaulWork holder
US2534882 *Oct 30, 1947Dec 19, 1950Samuel BriskmanMilling head
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3386283 *Oct 8, 1965Jun 4, 1968Bendix CorpTensile tester wedge clamp
US3386726 *Apr 5, 1965Jun 4, 1968Kieserling & AlbrechtClamping device
US3535911 *Dec 20, 1968Oct 27, 1970Boeing CoFriction test method and apparatus
US3535944 *Dec 5, 1968Oct 27, 1970Girling LtdBrake actuators
US3774897 *May 12, 1972Nov 27, 1973Klancnik AWork piece fixtures
US3777963 *Oct 27, 1972Dec 11, 1973Komatsu Mfg Co LtdCarry-out carriage device of peeling machine
US3817510 *Jan 10, 1973Jun 18, 1974J JatckoCam wedge swivel gripper head
US3919884 *Apr 17, 1974Nov 18, 1975Us Air ForceHorizontal loading fixture for sustained load testing
US4043211 *Oct 28, 1975Aug 23, 1977Nikolai Trofimovich RomanenkoApparatus for transmitting a command signal
US4203583 *May 19, 1978May 20, 1980Universal Instruments CorporationRadial lead component insertion machine
US4236703 *Aug 21, 1979Dec 2, 1980Stevenson Cleatus GControlled pressure draw clamp
US4365734 *Mar 4, 1980Dec 28, 1982Gang-Nail Systems, Inc.Splicing machine and method
US4467704 *Nov 15, 1982Aug 28, 1984Wabco Westinghouse Compagnia Freni S.P.A.Vehicle brake unit
US4511127 *Apr 18, 1983Apr 16, 1985Jergens, Inc.Hydraulic-mechanical clamping device
US4534605 *May 23, 1983Aug 13, 1985Daymarc CorporationSymmetrical, single point drive for contacts of an integrated circuit tester
US4537389 *Dec 27, 1983Aug 27, 1985Universal Automatic CorporationMachine tool fixture
US4629237 *May 30, 1985Dec 16, 1986Machine Engineering Co., Ltd.Parallel type robot chuck
US4705313 *Jun 30, 1986Nov 10, 1987Universal Instruments CorporationSelective gripping of inside and outside of articles
US4721293 *Aug 12, 1986Jan 26, 1988Jergens, Inc.Self-locking clamping device
US4774861 *Nov 5, 1987Oct 4, 1988Hughes Tool CompanyDrill pipe spinner
US4793602 *Oct 26, 1987Dec 27, 1988De-Sta-Co Division, Dover Resources, Inc.Locking power clamp
US4824087 *May 23, 1988Apr 25, 1989Lockheed CorporationClamp
US4951538 *Apr 7, 1989Aug 28, 1990Alexander BorzymSingle cut die set
US5039074 *Jan 11, 1991Aug 13, 1991Klancnik Adolph VMachine tool fixture
US5085480 *Jul 15, 1991Feb 4, 1992Jackson Donald TCam operated workpiece engaging apparatus
US5192260 *Nov 14, 1990Mar 9, 1993Amada Company, LimitedApparatus for transfer of a machine part
US5301533 *Jul 23, 1992Apr 12, 1994Jackson Donald TCam operated pierce apparatus
US5315855 *Feb 19, 1993May 31, 1994Jackson Donald TCam operated hemming apparatus
US5513425 *Oct 28, 1994May 7, 1996Williams; Anthony D.Pipe coupling tools
US5687601 *May 3, 1996Nov 18, 1997C.M.L. Costruzioni Meccaniche Liri S.R.L.Group for clamping and dragging a pipe or rod for pipe benders with or without an inner mandrel and rod benders, and machines for clamping mechanical parts in general
US5737820 *May 7, 1996Apr 14, 1998Franco FerrariTool for clamping runners onto drawers
US5762325 *Jan 29, 1996Jun 9, 1998Isi Norgren Inc.Power actuated gripper
US5762391 *Oct 20, 1994Jun 9, 1998Sez Semiconductor-Equipment Zubehor Fur Die Halbleiterfertigung Gesellschaft M.B.H.Gripper for disk-shaped articles
US5931452 *Feb 10, 1998Aug 3, 1999Tosok CorporationWire clamper for bonding apparatus
US5931518 *Jun 8, 1998Aug 3, 1999Sez Semiconductor- Equipment Zubehor Fur Die Halbleiterfertigung AgGripper for wafer-shaped articles
US5938257 *Nov 25, 1996Aug 17, 1999Isi Norgren Inc.Power actuated parallel gripper
US5961108 *Apr 25, 1997Oct 5, 1999Weber; Gene ChristopherTwo-sided gripping device
US5971361 *Apr 17, 1997Oct 26, 1999Heimbach; Jacob C.Clampless laminate flooring tool
US6237422 *Dec 9, 1998May 29, 2001Dage Precision Industries Ltd.Apparatus and method for testing strength of electrical bond sites on semiconductor devices
US6334641 *Jan 10, 2000Jan 1, 2002Mirae CorporationGripper for a surface mounting apparatus
US6471200 *Jan 12, 2001Oct 29, 2002Gimatic S.P.A.System for guiding the jaws in grippers operated by a fluid
US6568993 *Dec 13, 2001May 27, 2003General Electric CompanyFixture for clamping a gas turbine component and its use in shaping the gas turbine component
US7014235 *Sep 18, 2002Mar 21, 2006Storage Technology CorporationInertia actuation for robotic gripper mechanism
US7337648 *Aug 25, 2004Mar 4, 2008Timberwolf CorporationClamp and repair tool
US8100021 *Jul 3, 2007Jan 24, 2012Nordson CorporationTensile test device and method for testing deposits on electronic substrates
US8122751Oct 3, 2007Feb 28, 2012Timberline Tool, L.L.C.Clamp and repair tool
US8316684Nov 27, 2012Timberline Tool, L.L.C.Clamp and repair tool
US8562269 *Jul 29, 2010Oct 22, 2013Tracto-Technik Gmbh & Co. KgDrilling apparatus
US8646337Dec 15, 2011Feb 11, 2014Nordson CorporationTensile test device and method for testing deposits on electronic substrates
US8689599Nov 5, 2012Apr 8, 2014Timberline Tool, L.L.C.Clamp and repair tool
US9109740Nov 5, 2012Aug 18, 2015Timberline Tool, L.L.C.Multi-layered patch system and method
US9238280Jul 11, 2013Jan 19, 2016Honda Motor Co., Ltd.Dual shift unit for welder
US9377385Sep 15, 2015Jun 28, 2016Illinois Tool Works Inc.Rotating dovetail connection for materials testing
US20050050702 *Aug 25, 2004Mar 10, 2005Green Kenneth H.Clamp and repair tool
US20080087504 *Oct 13, 2006Apr 17, 2008Jacob KobeltRoller housing having retaining arms
US20090301216 *Jul 3, 2007Dec 10, 2009Nordson CorporationTensile test device and method for testing deposits on electronic substrates
US20110200413 *Aug 18, 2011Tracto-Technik GmbH Co. KGDrilling apparatus
USRE32704 *Aug 1, 1986Jun 28, 1988 Hydraulic-mechanical clamping device
DE3416082A1 *Apr 30, 1984Nov 7, 1985Konrad MarekMethod, test strip and apparatus for testing the tensile strength of paper, cardboard, paperboard and the like
DE3723494A1 *Jul 16, 1987Feb 25, 1988Jergens IncSelbsthemmende spannvorrichtung
DE3723494C2 *Jul 16, 1987Jul 23, 1998Jergens IncSpannvorrichtung
DE4036307A1 *Nov 14, 1990May 23, 1991Amada CoEinrichtung zur uebergabe eines maschinenteiles
DE102006005636A1 *Feb 8, 2006Aug 16, 2007Audi AgWorkpiece clamping device, especially wheel carrier clamping device, has common lifting piston type transfer element connected between two clamping levers and drive element that transfers drive movement of drive element to clamping levers
DE102006005636B4 *Feb 8, 2006Dec 6, 2007Audi AgWerkstück-Spannvorrichtung, insbesondere Radträger-Spannvorrichtung, sowie Spannanordnung mit einer solchen Werkstück-Spannvorrichtung
DE202004019369U1 *Dec 15, 2004Apr 20, 2006Staudinger Forschungs- Und Entwicklungs Gmbh & Co. KgSpannvorrichtung
EP0160292A2 *Apr 29, 1985Nov 6, 1985Konrad MarekMethod, apparatus and specimen for testing the tensile strength of paper, cardboard, plastic sheets and the like
WO2005023494A3 *Aug 25, 2004Dec 29, 2005Timberline Tool & Casting IncClamp and repair tool
U.S. Classification73/857, 269/256, 294/119.1, 269/234, 269/218, 100/264, 73/859, 269/34, 100/291, 269/161, 74/110, 294/207
International ClassificationG01N3/04
Cooperative ClassificationG01N3/04
European ClassificationG01N3/04