Patent US772177A successfully refreshed from Google Patents.
Patent US4006655A successfully refreshed from Google Patents.
US4006655A
Expired / Lapsed
US
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Device for protecting tools and workpieces from damage on a hydraulically or pneumatically operated stamping press
Assignee: Schaeffler Schweiz GmbH
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Filing: 1976-03-17
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Granted: 1977-02-08
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Expires: 1996-03-17
Abstract
Abstract A device for precluding improper operation of a stamping press including a control cylinder the piston of which is impinged on one side by a pressure medium and on the other side by a pressure medium having a variable constant pressure. Electrical switch elements are utilized to prevent the stamping operation from progressing unless preset conditions exist.
Inventors
- 👤 Martin Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:05
CPC Classifications
F; F16; F16P; F16P7/00; F16P7/02; B; B21; B21D; B21D28/00; B21D28/002; B30; B30B; B30B15/00; B30B15/28; B30B15/285; Y; Y10; Y10T; Y10T408/00; Y10T408/13; Y10T408/14; Y10T408/15; Y10T83/00; Y10T83/081; Y10T83/091; Y10T83/525; Y10T83/538
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A device for protecting tools and workpieces from damage on a hydraulically or pneumatically operated stamping press, comprising a rigid pressing table bearing the cutting tools and a movable pressing table, and a movable element which responds either when cutting tools contact the workpiece to be stamped or when a hard foreign body is disposed between the workpiece and one of the cutting tools; the movable pressing table being disposed in drive connection with a first switch and the movable element with a second switch such that the movable pressing table is arrested when the second switch is actuated before the first switch, characterized in that the movable control element (18) is disposed in a housing (17) disposed external to the two pressing tables (5,9); one side of the housing (17) being impinged by the pressure medium which operates the piston (38) and the other side being impinged by a second pressure medium having a variable constant pressure.
Claim 2
Independent Claim
158 words
A device for protecting tools and workpieces from damage on a hydraulically or pneumatically operated stamping press, comprising a rigid pressing table bearing the cutting tools and a movable pressing table, and a movable element which responds either when cutting tools contact the workpiece to be stamped or when a hard foreign body is disposed between the workpiece and one of the cutting tools; the movable pressing table being disposed in drive connection with a first switch and the movable element with a second switch such that the movable pressing table is arrested when the second switch is actuated before the first switch, characterized in that the movable control element (18) is disposed in a housing (17) disposed external to the two pressing tables (5,9); one side of the housing (17) being impinged by the pressure medium which operates the piston (38) and the other side being impinged by a second pressure medium having a variable constant pressure.
Claim 3
Dependent Claim
46 words
A device as claimed in claim 1, characterized in that the housing is in the form of a separate cylinder (17) containing as the movable control element a piston (18) which is disposed in drive connection with the second switch (24) via a piston rod (23).
Claim 4
Dependent Claim
29 words
A device as claimed in claim 2, characterized in that the second pressure medium is compressed air which is supplied to the cylinder (17) via a regulating valve (27).
Claim 5
Dependent Claim
51 words
A device as claimed in claim 1, characterized in that the pressing table (9) further includes an upwardly projecting pin (31) arranged to cooperate with the travel of the strip (38) and interrupt press operation upon an inadequate length of said strip attaining a predetermined position beneath the cutting die (6).
References Cited (Backward Citations)
US3513736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |