Patent US3908436A successfully refreshed from Google Patents.
US3908436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power press with overload protection
Assignee: MASCHINENFABRIK HASENCLEVER GmbH
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Filing: 1974-05-01
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Granted: 1975-09-30
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Expires: 1994-05-01
Abstract
Abstract A power press with an eccentric for the vertical reciprocation of a hammer has its drive shaft eccentrically journaled in bearing sleeves whose common axis is horizontally offset from the shaft axis whereby a torque is exerted upon the sleeves by the reaction force of a workpiece struck by the hammer. The sleeves, which are themselves rotatably mounted in the press frame, are integral with horizontally extending arms which tend to swing about the sleeve axis in response to the exerted torque, such swinging being normally prevented by a frictional, fluidic or elastic counterforce acting upon the free ends of the arms.
Inventors
- 👤 Werner Bothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:01
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/28; B30B15/281; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2151; Y10T83/00; Y10T83/869; Y10T83/8696
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
A power press comprising: a stationary frame forming a fixed anvil; a hammer co-operating with said anvil for deforming a workpiece interposed therebetween; drive means for reciprocating said hammer on said frame, said drive means including a shaft, an eccentric coupling between said shaft and said hammer, and sleeve means forming an eccentric bearing for said shaft, said sleeve means being rotatably journaled in said frame and being centered on a swing axis offset from the shaft axis in a direction generally transverse to the path of hammer reciprocation whereby the reaction force of a workpiece struck by said hammer exerts a torque upon said sleeve means tending to rotate same about said swing axis; a member integral with said sleeve means rotatable therewith about said swing axis; and yieldable restraining means engaging said member at a location remote from said swing axis for normally preventing any rotation thereof.
Claim 2
Dependent Claim
149 words
A power press comprising: a stationary frame forming a fixed anvil; a hammer co-operating with said anvil for deforming a workpiece interposed therebetween; drive means for reciprocating said hammer on said frame, said drive means including a shaft, an eccentric coupling between said shaft and said hammer, and sleeve means forming an eccentric bearing for said shaft, said sleeve means being rotatably journaled in said frame and being centered on a swing axis offset from the shaft axis in a direction generally transverse to the path of hammer reciprocation whereby the reaction force of a workpiece struck by said hammer exerts a torque upon said sleeve means tending to rotate same about said swing axis; a member integral with said sleeve means rotatable therewith about said swing axis; and yieldable restraining means engaging said member at a location remote from said swing axis for normally preventing any rotation thereof.
Claim 3
Dependent Claim
25 words
A press as defined in claim 1 wherein said restraining means is adjustable for varying the normal distance between said shaft axis and said anvil.
Claim 4
Dependent Claim
33 words
A press as defined in claim 1 wherein said member comprises an arm extending from said sleeve in said generally transverse direction, said arm having a free end engaged by said restraining means.
Claim 5
Dependent Claim
21 words
A press as defined in claim 3 wherein said sleeve and said arm are duplicated on opposite sides of said hammer.
Claim 6
Dependent Claim
21 words
A press as defined in claim 3 wherein said restraining means comprises a friction coupling between said arm and said frame.
Claim 7
Dependent Claim
50 words
A press as defined in claim 5 wherein said arm is provided with an arcuate slot centered on said swing axis, said friction coupling including a bolt on said frame traversing said slot and a spring-loaded washer on said bolt bearing upon said arm along the edges of said slot.
Claim 8
Dependent Claim
56 words
A press as defined in claim 3 wherein said restraining means comprises a fluid cylinder anchored to said frame, a double-acting piston in said cylinder linked with said arm, and a fluid circuit connected to said cylinder, said circuit including a pressure-relief valve normally blocking fluid circulation from one side of said piston to the other.
Claim 9
Dependent Claim
25 words
A press as defined in claim 3 wherein said restraining means comprises a pair of counteracting prestressed springs bearing upon said arm and said frame.
Claim 10
Dependent Claim
20 words
A press as defined in claim 3 wherein said swing axis lies between said free end and said shaft axis.
Claim 11
Dependent Claim
36 words
A press as defined in claim 1, further comprising a flywheel loosely carried on said shaft, transmission means linking said flywheel with said drive means, and a clutch on said shaft for rotary entrainment of same.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |