US3565415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-operated bar clamp
Assignee: Individual
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Filing: 1968-07-05
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Granted: 1971-02-23
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Expires: 1988-07-05
Abstract
Abstract A workpiece clamp actuated by a power cylinder and having a lever type clamp arm and a toggle linkage connecting the piston rod of the power cylinder and such lever clamp arm, to insure locking of the parts in workpiece holding position and to provide two mechanical advantages.
Inventors
- 👤 Leland F Blatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
B; B25; B25B; B25B5/00; B25B5/06; B25B5/061; B25B5/064; B25B5/12; B25B5/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
283 words
In a workpiece clamp: a horizontal base part, a body providing a pressure cylinder, a piston therein, a horizontal rod for said piston above said base part, a horizontal clamping lever above said rod and pivoted to said body by a pin fixed centrally in said lever and riding in horizontal slot means provided on said body, said lever having a workpiece engaging part at its left end; a first toggle link connected at its upper end by a pivot pin to the right end of said lever; a second toggle link overlapping and below said first toggle link and connected at its lower end to a right end of said base part; a pivot pin connecting the lower end of the first link to a point on the second link; a central pivot pin connected to the right end of said piston rod to a point on both links where they overlap; with said first link having a bent cam slot, with a horizontal part and an upwardly and rightwardly inclined part, receiving the central pin; and with the second link having a slot also receiving the central pin; with said central pin and the slots receiving it being so arranged that when the piston rod is moved to the maximum leftward position as permitted by the slot of the first link, the central pin is over center of the toggle formed by said links for locking; and the slots also beIng so arranged that when the rod is moved to the right its central pin cams the first link clockwise and rocks the lever clockwise and also pulls it to the right as permitted by the slot means on said body.
Claim 2
Dependent Claim
283 words
In a workpiece clamp: a horizontal base part, a body providing a pressure cylinder, a piston therein, a horizontal rod for said piston above said base part, a horizontal clamping lever above said rod and pivoted to said body by a pin fixed centrally in said lever and riding in horizontal slot means provided on said body, said lever having a workpiece engaging part at its left end; a first toggle link connected at its upper end by a pivot pin to the right end of said lever; a second toggle link overlapping and below said first toggle link and connected at its lower end to a right end of said base part; a pivot pin connecting the lower end of the first link to a point on the second link; a central pivot pin connected to the right end of said piston rod to a point on both links where they overlap; with said first link having a bent cam slot, with a horizontal part and an upwardly and rightwardly inclined part, receiving the central pin; and with the second link having a slot also receiving the central pin; with said central pin and the slots receiving it being so arranged that when the piston rod is moved to the maximum leftward position as permitted by the slot of the first link, the central pin is over center of the toggle formed by said links for locking; and the slots also beIng so arranged that when the rod is moved to the right its central pin cams the first link clockwise and rocks the lever clockwise and also pulls it to the right as permitted by the slot means on said body.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |