Patent US3589708A successfully refreshed from Google Patents.
US3589708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamping device
Assignee: CLEROB Inc
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Filing: 1969-06-02
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Granted: 1971-06-29
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Expires: 1989-06-02
Abstract
Abstract A clamping device for holding a workpiece between an anvil surface and a movable workpiece-engaging member has a threaded adjustment shaft received in a threaded sleeve portion of a frame for moving the workpiece-engaging member toward and away from the anvil surface. The workpiece-engaging member is mounted on one end of a rod having the other end threadedly received in a recess in one end of the threaded adjustment shaft and the threads on the shaft and rod are of the same hand and of different leads whereby relative movement between the shaft and rod occurs upon continued rotation of the shaft after the workpiece-engaging member engages the workpiece.
Inventors
- 👤 David W Cosner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:49
CPC Classifications
B; B25; B25B; B25B5/00; B25B5/06; B25B5/10; B25B5/101
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
286 words
A clamping device comprising: a. a frame having a stationary anvil surface and an elongate sleeve portion spaced from said anvil surface, said sleeve portion having an axial bore with internal helical screw threads, the longitudinal axis of said bore substantially perpendicular to said anvil surface, b. an elongate movable member having a shaft extending through said sleeve portion bore with one end toward and spaced from said anvil surface, said shaft having external helical screw threads engaged with and cooperating with said screw threads in the sleeve portion bore, said screw threads having a selected inclination with respect to the longitudinal axis of the sleeve portion bore whereby the shaft is moved toward the anvil surface in response to rotation in one direction, said shaft having an axial bore extending therein from said one end, c. internal helical screw threads in said shaft bore and having an inclination relative to said longitudinal axis in the direction of the inclination of the external screw threads on the shaft and of lesser lead, d. a workpiece-engaging head having an elongate shank extending therefrom with external helical screw threads engaged with and cooperating with the internal screw threads in said shaft bore, said workpiece-engaging head and shank being bodily carried by the movable member and moved to engage said head with a workpiece between the head and anvil surface in response to rotation of said movable member in said one direction, said screw threads of the sleeve portion shaft and shank cooperating whereby the rotation of the head stops on clamping engagement with said workpiece and continued rotation of the movable member in said one direction provides a differential screw action increasing the clamping force on the workpiece.
Claim 2
Dependent Claim
286 words
A clamping device comprising: a. a frame having a stationary anvil surface and an elongate sleeve portion spaced from said anvil surface, said sleeve portion having an axial bore with internal helical screw threads, the longitudinal axis of said bore substantially perpendicular to said anvil surface, b. an elongate movable member having a shaft extending through said sleeve portion bore with one end toward and spaced from said anvil surface, said shaft having external helical screw threads engaged with and cooperating with said screw threads in the sleeve portion bore, said screw threads having a selected inclination with respect to the longitudinal axis of the sleeve portion bore whereby the shaft is moved toward the anvil surface in response to rotation in one direction, said shaft having an axial bore extending therein from said one end, c. internal helical screw threads in said shaft bore and having an inclination relative to said longitudinal axis in the direction of the inclination of the external screw threads on the shaft and of lesser lead, d. a workpiece-engaging head having an elongate shank extending therefrom with external helical screw threads engaged with and cooperating with the internal screw threads in said shaft bore, said workpiece-engaging head and shank being bodily carried by the movable member and moved to engage said head with a workpiece between the head and anvil surface in response to rotation of said movable member in said one direction, said screw threads of the sleeve portion shaft and shank cooperating whereby the rotation of the head stops on clamping engagement with said workpiece and continued rotation of the movable member in said one direction provides a differential screw action increasing the clamping force on the workpiece.
Claim 3
Dependent Claim
63 words
A clamping device as set forth in claim 1 wherein: a. the frame is C-shaped with the anvil surface at the end of one arm and the sleeve portion is at the end of the other arm, b. a lever means is on said movable member for rotating same to move the shaft longitudinally in the internally threaded bore of the sleeve portion.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |