Patent US3744838A successfully refreshed from Google Patents.
US3744838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction clamp
Assignee: Individual
•
Filing: 1972-01-28
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Granted: 1973-07-10
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Expires: 1992-01-28
Abstract
Abstract A clamp formed from two identical clamp members interconnected by an adjustable bolt which passes through them. The clamp is actuated by a pair of rotary cams journalled in cylindrical recesses in opposed faces of the clamp members, the cams having convex interengaging cam faces so that when rotated together in contact they spread the clamp members at one end of the clamp and thereby close the ends at the other end of the clamp. This arrangement is of particular value in the repair of automobile bodies which have been damaged, since a sheet of metal can be engaged either at the end or at the side of the clamp, or the clamp members may be located one on each side of a sheet of metal and bolted together through the sheet. In a variant, adjustable jaws are provided on the clamp to facilitate the lifting of blocks of material of varying widths.
Inventors
- 👤 R Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:31
CPC Classifications
B; B25; B25B; B25B5/00; B25B5/06; B25B5/08; B23; B23K; B23K37/00; B23K37/04; B23K37/0426; B23K37/0435; B25B5/04; Y; Y10; Y10S; Y10S72/00; Y10S72/705; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53896
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A clamp comprising a pair of clamp members presenting opposed clamping jaws at one end of the clamp and opposed part cylindrical recesses forming journal means for rotatable cams at the other end of the clamp, means providing a fulcrum between the jaws and recesses for each of said clamp members, and opposed rotatable cams having part cylindrical bearing surfaces received in said recesses, said cams having interengaging convex cam faces for causing a spreading movement of said other ends of said clamping members when rotated in said recesses from an inoperative position.
Claim 2
Dependent Claim
93 words
A clamp comprising a pair of clamp members presenting opposed clamping jaws at one end of the clamp and opposed part cylindrical recesses forming journal means for rotatable cams at the other end of the clamp, means providing a fulcrum between the jaws and recesses for each of said clamp members, and opposed rotatable cams having part cylindrical bearing surfaces received in said recesses, said cams having interengaging convex cam faces for causing a spreading movement of said other ends of said clamping members when rotated in said recesses from an inoperative position.
Claim 3
Dependent Claim
46 words
A clamp as claimed in claim 1, wherein said clamp members are formed with substantially flat opposed surfaces and wherein said means providing a fulcrum comprises an adjustable bolt extending through said clamp members, whereby said flat opposed surfaces can be brought substantially into mutual contact.
Claim 4
Dependent Claim
44 words
A clamp as claimed in claim 1, wherein said clamp members are bifurcated at said other ends in a direction at right angles to said part cylindrical recesses, and wherein said cams each further comprise an operating lever extending from said cylindrical bearing surface.
Claim 5
Dependent Claim
24 words
A clamp as claimed in claim 3, wherein said operating levers are each notched at their ends for engagement with means to apply leverage.
Claim 6
Dependent Claim
53 words
A clamp as claimed in claim 3 and further comprising a pair of secondary operating levers pivoted one to each of said first mentioned levers and a common link to which each of said secondary levers is pivoted for causing simultaneous equal rotation of said cams through said first mentioned and secondary levers.
Claim 7
Dependent Claim
34 words
A clamp as claimed in claim 1, wherein said clamp members comprise oppositely extending perpendicular extensions at said one end of the clamp, and a pair of jaw members adjustably mounted on said extensions.
Claim 8
Dependent Claim
38 words
A clamp as claimed in claim 6, wherein said jaw members comprise a pair of longitudinal elements apertured for engagement over said extensions, a pair of locking bolts extending through said element walls for engagement with said extensions.
Claim 9
Dependent Claim
20 words
A clamp as claimed in claim 7, wherein said jaw members further comprise friction pads bonded to their opposed surfaces.
Claim 10
Dependent Claim
59 words
Means for effecting a controlled spreading movement between two opposed members, comprising opposed part cylindrical recesses forming cam journal means provided on said members, opposed rotatable cams having part cylindrical bearing surfaces received in said recesses, said cams having interengaging convex cam faces, and means for causing rotation of said cams in said recesses to effect said spreading movement.
Claim 11
Dependent Claim
59 words
Means for effecting a controlled spreading movement between two opposed members, comprising opposed part cylindrical recesses forming cam journal means provided on said members, opposed rotatable cams having part cylindrical bearing surfaces received in said recesses, said cams having interengaging convex cam faces, and means for causing rotation of said cams in said recesses to effect said spreading movement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |