US4062219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic-frictional system for rotating the arm of a forging manipulator
Assignee: VMEI "LENIN" - NIS
•
Filing: 1976-03-12
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Granted: 1977-12-13
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Expires: 1996-03-12
Abstract
Abstract The arm of a forging manipulator has tongues at one end for engaging with a workpiece and is journaled for rotation about a horizontal axis. At the other end the arm carries a pair of clamps each of which has a pair of clamping jaws pivotally connected at one end and adapted to be spread apart or drawn against the arm by a spreading hydraulic cylinder at the other end of each pair of jaws. The cylinders are interconnected for reversing operation and are hydraulically linked to a pair of drive cylinders, the pistons of which are pivotally connected to the respective clamps so that one of the drive cylinders is effective to rotate the arm when its clamping cylinder draws its jaws against the arm while the other clamping cylinder spreads the other pair of jaws apart during the ineffective stroke of the drive piston.
Inventors
- 👤 Nikola Tomov Chuparov
- 👤 Dobri Tzvetkov Pakyov
- 👤 Peter Nachev Papazov
- 👤 Tzvetan Mladenov Savov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:43
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/22; B; B21; B21J; B21J13/00; B21J13/08; B21J13/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
A hydraulic-frictional system for operating a forging manipulator, comprising: a forging-manipulator arm journaled for rotation about a horizontal axis and carrying tongs engageable with a workpiece; first and second clamps surrounding said arm and each having a pair of clamping jaws adapted to embrace said arm upon displacement of the jaws of each clamp toward one another and to allow free rotation of said arm relative to the respective clamps in a spread-apart position of the jaws thereof, each pair of jaws being pivotally connected at one end and being provided at its other end with a respective double-acting hydraulic clamping cylinder adapted to displace the jaws of each pair toward and away from one another; respective double-acting power cylinders each pivotally connected to a separate one of said clamps, said power cylinders having a head chamber and a rod chamber; conduit means hydraulically connecting pressurizable compartments of said clamping cylinders for inverse operation whereby one of said clamps seizes said arm while the other of said clamps permits free rotation thereof; and means for alternately pressurizing one of said head or rod chambers of said power cylinders to rotate said first and second clamps, said one clamp seizing said arm and thereby displacing it while the other of said clamps being rotated without affecting rotation of said arm.
Claim 2
Dependent Claim
219 words
A hydraulic-frictional system for operating a forging manipulator, comprising: a forging-manipulator arm journaled for rotation about a horizontal axis and carrying tongs engageable with a workpiece; first and second clamps surrounding said arm and each having a pair of clamping jaws adapted to embrace said arm upon displacement of the jaws of each clamp toward one another and to allow free rotation of said arm relative to the respective clamps in a spread-apart position of the jaws thereof, each pair of jaws being pivotally connected at one end and being provided at its other end with a respective double-acting hydraulic clamping cylinder adapted to displace the jaws of each pair toward and away from one another; respective double-acting power cylinders each pivotally connected to a separate one of said clamps, said power cylinders having a head chamber and a rod chamber; conduit means hydraulically connecting pressurizable compartments of said clamping cylinders for inverse operation whereby one of said clamps seizes said arm while the other of said clamps permits free rotation thereof; and means for alternately pressurizing one of said head or rod chambers of said power cylinders to rotate said first and second clamps, said one clamp seizing said arm and thereby displacing it while the other of said clamps being rotated without affecting rotation of said arm.
Claim 3
Dependent Claim
93 words
The system defined in claim 1 wherein said means for pressurizing includes a source of hydraulic fluid, a distributor disposed between said source and said power cylinders for alternatingly feeding fluid under pressure to said head and rod chambers in alternate positions of said distributor; limit switch means responsive to the angular positions of at least one of said clamps and operatively connected to said distributor for shifting same between the alternate positions thereof, and manually controlled means for blocking the flow of fluid from said source to said clamping and power cylinders.
Claim 4
Dependent Claim
22 words
The system defined in claim 2 further comprising reversible valve means connected between the output of said distributor and said conduit means.
Claim 5
Dependent Claim
34 words
The system defined in claim 3, further comprising flow control means between said distributor for each of said power cylinders for regulating the rate of operations thereof and the angular velocity of said arm.
References Cited (Backward Citations)
US3018986A
Cited
GB1094329A
Cited
US3434387A
Cited
US3431822A
Cited
US3515009A
Cited
US3915064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |