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Publication numberUS3618931 A
Publication typeGrant
Publication dateNov 9, 1971
Filing dateJan 19, 1970
Priority dateJan 19, 1970
Also published asDE2103482A1
Publication numberUS 3618931 A, US 3618931A, US-A-3618931, US3618931 A, US3618931A
InventorsBlatt Leland F
Original AssigneeBlatt Leland F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cam wedge power clamp
US 3618931 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent [50] Field of Search 269/32, 94. 233

[56] References Cited UNITED STATES PATENTS 3,362,703 1/1968 Blatt 269/233 Primary E.mminer-William S. Lawson mummy-Cullen, Settle, Sloman & Cantor ABSTRACT: A power-actuated clamp used for holding workpieces in a fixed position having reversible parts for simplified construction.

PATENTEnNuv- 9 IS?! SHEET 1 [IF 3 I l I l IN, I



mvsmon LELAND F. BLATT ATTORNEYS CAM WEDGE POWER CLAMP BACKGROUND OF THE INVENTION l. Field of the Invention This invention relates to a cylinder-operated power clamp having a body section comprising two identical parts which enables the clamp to be simply and economically manufactured.

2. The Prior Art Various power clamps are known in the art. The clamps in general have a cast body section used in securing the clamp arm. These body sections are in general one piece.

It is an object of this invention to provide a new and improved power clamp having a body section of two identical and interchangeable parts.

Other objects and advantages of this invention will become apparent from the following specification when considered in conjunction with the accompanying drawings, in which:

FIG. 1 is a plan view of the power clamp of this invention;

FIG. 2 is a side elevational view of the clamp of FIG. 1;

FIG. 3 is a sectional view in the direction of arrows 3-3 FIG. 2;

FIG. 4 is a side elevational view ofa body member forming a part of the power clamp of this invention; and

FIG. 5 is a side elevational view of an alternative embodiment of the clamp of the invention, with parts shown in phantom.

Referring now to the drawings, the power clamp of this invention comprises a body 12 which comprises two identical members 14 and 16 which abut each other on a common side. Each member 14 or 16 comprises a base plate 18 having a vertically extending rib 20 at one end, and another vertically extending rib 22 at an intermediate location. A horizontally extending rib 24 extends the length of the base plate 18 between the vertically extending ribs 20 and 22, and also along the rest of the plate. The base plate 18 has bores 26 in the top and bottom in the included areas defined by the ribs 20, 22 and 24 and the horizontally extending rib 24 has vertical bores 28 in it through that section limited by the ribs 20 and 22. The bores 26 and 28 are means by which the body 12 can be attached to a support, i.e., screws or bolts can be inserted through the bores 26 or 28 into a support structure, not shown. Further to the right on the base plate 18, as seen in FIGS. 2 and 4, are a pair of horizontally extending vertically aligned bores 30, one on each side of the rib 24. The rib 24 has opposed arcuate recesses 32 adjacent the bores 30.

The inward side of the base plate 18 is offset from a point coinciding with the rib 22, on to the right end of the plate 18, as seen in FIG. 1, forming a recess 34. The inner face of the plate 18 defines a guide slot 36. The guide slot 36 merges into a semicylindrical longitudinal bore 38 as the rear of the plate 18 is approached. The opposed plates 18 form a longitudinal bore from the semicylindrical bores 38 when they abut each other.

A power cylinder 40 is secured to one end of the body by means of bolts which extend through the ribs 20. Thus, each body member 14 and 16 is fastened to the power cylinder 40, The power cylinder 40 may be either a hydraulically or pneumatically operated piston or solenoid.

A clamp arm 44 having a pivot bore 45 is pivotally mounted on body 12 by pivot bolt 46. Clamp arm 44 is illustrated without any particular fixture at its upper end portion, it being understood that the particular fixture used in conjunction with this assembly does not form a part of this invention.

A roller cam 48 rides in a follower slot 50 formed in the clamp arm 44. The roller cam 48 is carried by an axle 52 secured to the opposed arms ofa clevis 54.

Clevis 54 is in turn rigidly connected to end of piston rod 56, and is mounted for reciprocating movement within the guide slots 36 formed in the opposed inner faces of the base plates 18 of body 12. A pair of bronze elongated blocks 58 for the axle 52 are slidably mounted at the outer ends of axle 52. The guide blocks 58 are seated in the slots 36 and provide smooth and easy reciprocating of clevis 54in body 12.

In operation, actuation of the power cylinder 40 upon a predetermined signal causes leftward movement of piston rod 56 and clevis 54 from the position shown in the figures. This in turn causes roller cam 48 to move toward the left end of follower slot 50.

The follower slot 50 is inclined relative to the axis of reciprocation of the clamp arm 44. Because of the inclination of slot 50 with respect to the axis of reciprocation, clamp arm 44 is forced to pivot clockwise about bolt 46, as viewed in FIG. 2. A subsequent actuation of power cylinder 40 causes the process to be repeated in the reverse direction, with clamp arm 44 pivoting counterclockwise about bolt 46 until it is in the position shown in the figures.

It will be apparent that the power clamp of this invention provides a simple linkage with a minimum of moving parts while creating a high mechanical advantage. Clamp arm 44 is dimensioned relative to the recesses between the opposing portions of body members 14 and 16 to provide substantially no space between the side faces of the arm and the inner opposed faces of the body members, so as to eliminate the possibility of foreign matter and debris entering and fouling the mechanism. Furthermore, the positioning of the roller cam between the clevis legs and the positioning of the guide blocks outside the clevis legs provides an extremely rigid assembly.

While as shown in the figures the clamp arm 44 is pivotable from a horizontal to an upwardly vertical position, it can also be pivoted from a horizontal to a downwardly vertical position. This is accomplished by simply reversing the arm and pivoting it about the lower of the vertically aligned bores 30.

. Thus, it is apparent that the two members 14 and 16 are interchangeable and they also allow a clamp arm to be pivoted from a horizontal to an upwardly vertical direction or from a horizontal to a lower vertical direction without modification of the body component.

In an alternative embodiment, as seen in FIG. 5, the clamp arm 44 is pivotably connected at the base thereof to the clevis 54 by means of the axle 52 extending through the clevis 54 and pivot bore 45 of the clamping arm 44. A pivot bolt 46 extends between the lower orifices 30 and through the follower slot 50 of the clamp arm 44. A cam roller 60 is confined within the follower slot 50. This allows the clamp arm 44 to have both a reciprocal movement imparted by the piston rod 56 of the power cylinder and a rotational movement around the pivot bolt 46 extending through the orifices 30. Thus, clamping force is imparted by retracting the arm 44 by means of the clevis 54. When an attachment A is mounted on the end of the clamping arm 44, and the arm 44 is simultaneously retracted and pivoted, the object 0 being clamped, is squeezed between the attachment A and a support fixture F.

I claim:

1. A clamp comprising a body section comprising a pair of reversibly interchangeable substantially identical abutting body members, each of which has a pair of vertically aligned pivot holes for pivotably mounting a clamping arm between opposed body members, said pivot holes of opposed body members being axially aligned, said body members defining a longitudinal bore, there being formed upon the interior of said body members a pair of enclosed inwardly opening body groove tracks communicating with said bore, means for mounting said body members on a support structure, a clevis mounted for reciprocating motion in said bore and having spaced legs, means for reciprocating said clevis, an axle trans-- versely connecting said legs and provided with guide blocks on the outer ends thereof slidable in said body groove tracks, a clamping arm having a pivot bore and a follower slot offset and inclined from the axis of said longitudinal bore, mounted for pivotal movement between opposed portions of the body, said axle being confined within said slot or said pivot bore, and, wherein, said axle extends through said pivot bore, a pin extends through an opposed pair of said pivot holes and said follower slot, and a cam roller is situated within said follower slot and around said pin; whereby reciprocation of said clevis causes said clamping arm to simultaneously pivot and linearly extend or retract along the axis of said bore.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3724837 *Sep 2, 1970Apr 3, 1973Dover CorpRetracting clamp
US4496138 *Mar 26, 1982Jan 29, 1985Blatt Leland FPower operated clamp
US4570914 *Apr 9, 1984Feb 18, 1986Blatt Leland FPower operated clamp
US4905973 *Jan 11, 1989Mar 6, 1990Blatt John APower operated clamp with externally mounted adjustable clamp arm
US5118088 *Jan 9, 1991Jun 2, 1992Btm CorporationPower clamp
US5165670 *Oct 16, 1991Nov 24, 1992Btm CorporationRetracting power clamp
US5171001 *Mar 11, 1991Dec 15, 1992Btm CorporationSealed power clamp
US5575462 *Aug 17, 1994Nov 19, 1996Blatt; John A.Rotary clamp for a linear actuator
US5634629 *Dec 22, 1994Jun 3, 1997Isi Norgren Inc.Rotary clamp having a common plane mounting arrangement
US5676357 *Nov 30, 1995Oct 14, 1997Aladdin Engineering & Manufacturing, Inc.Clamp including resilient internal link
US5687961 *Nov 30, 1995Nov 18, 1997Aladdin Engineering & Manufacturing, Inc.Fluid operated clamp including integral frame and slide member support
US5799932 *Oct 31, 1996Sep 1, 1998Isi Norgren Inc.Rotary clamp having a common plane mounting arrangement
US5816567 *Apr 14, 1997Oct 6, 1998Aladdin Engineering And Manufacturing, Inc.Fluid operated clamp including integral frame and slide member support
US5853211 *Jan 10, 1997Dec 29, 1998Btm CorporationUniversal gripper
US5871250 *Mar 31, 1997Feb 16, 1999Btm CorporationSealed straight line gripper
US5884903 *Oct 30, 1995Mar 23, 1999Btm CorporationPowered clamp and gauging apparatus
US5938259 *Jul 18, 1997Aug 17, 1999Btm CorporationPad for universal gripper
US6059277 *May 5, 1998May 9, 2000Btm CorporationRetracting power clamp
US6115898 *Jun 6, 1995Sep 12, 2000Btm CorporationForce multiplying apparatus for clamping a workpiece and forming a joint therein
US6290210Jun 1, 1999Sep 18, 2001Aladdin Engineering & ManufacturingClamping and lifting mechanism
US6412845Jul 7, 2000Jul 2, 2002Btm CorporationSealed gripper
US6450082Dec 18, 2000Sep 17, 2002Btm CorporationShot pin
US6634630Sep 18, 2001Oct 21, 2003Aladdin Engineering & ManufacturingClamping and lifting mechanism
US7448607Dec 14, 2005Nov 11, 2008Phd, Inc.Pin clamp assembly
US7467788Feb 27, 2007Dec 23, 2008Phd, Inc.Pin clamp
US7516948Nov 22, 2005Apr 14, 2009Phd, Inc.Pin clamp accessories
US7815176Oct 19, 2010Phd, Inc.Lock mechanism for pin clamp assembly
US8376336Feb 19, 2013Phd, Inc.Strip off pin clamp
US8413970Apr 9, 2013Phd, Inc.Pin clamp assembly
US8459626May 28, 2010Jun 11, 2013Btm CorporationPin clamp
US20080287046 *Jul 12, 2005Nov 20, 2008Pierre TschampionDevice for Clamping a Tool Insert in a Grinding Machine
USRE31991 *Feb 23, 1983Sep 24, 1985 Single guide rod actuating unit
EP0607410A1 *Jul 23, 1993Jul 27, 1994United Technologies Automotive, Inc.Slide actuated holding clamp
WO2005056241A1 *Dec 3, 2004Jun 23, 2005Christophe BoiteuxQuick clamping device and control method
U.S. Classification269/94, 269/233, 269/32
International ClassificationB25B5/08, B25B5/00, B25B5/06
Cooperative ClassificationB25B5/087, B25B5/061
European ClassificationB25B5/08D, B25B5/06B
Legal Events
Jan 9, 1989ASAssignment
Effective date: 19880901