Patent US3596592A successfully refreshed from Google Patents.
US3596592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive detector for a ram movable on a frame
Assignee: Langenstein and Schemann GmbH
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Filing: 1969-03-20
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Granted: 1971-08-03
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Expires: 1989-03-20
Abstract
Abstract A capacitive detector for a ram of a press hammer where a rod forms one electrode of the capacitor and the wall of a bore forms the other electrode of the capacitor, the rod and bore being arranged so that one can move with the ram and the other is joined to a stationary frame.
Inventors
- 👤 Karl Trissnak
- 👤 Kurt Siller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:00
CPC Classifications
B; B21; B21J; B21J7/00; B21J7/20; B21J7/46; B21J9/00; B21J9/10; B21J9/20; B30; B30B; B30B15/00; B30B15/14; B30B15/16; B30B15/166
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A press having at least one ram movably mounted on a frame and means for actuating said ram, the improvement comprising a capacitive detector for determining the position of said ram relative to said frame, said detector comprising two electrodes and electrical connections to indicator means, the first electrode being the wall defining a bore which is on the back face of said ram, the second electrode being a smooth rod insulatively fixed to said frame and having an axis parallel to said bore, said second electrode being so positioned and the relative size of said two electrodes being such that when the back face of said ram approaches said frame, said second electrode continues down the bore of said first electrode thereby changing the capacitance of said detector which is registered by said indicating means.
Claim 2
Dependent Claim
136 words
A press having at least one ram movably mounted on a frame and means for actuating said ram, the improvement comprising a capacitive detector for determining the position of said ram relative to said frame, said detector comprising two electrodes and electrical connections to indicator means, the first electrode being the wall defining a bore which is on the back face of said ram, the second electrode being a smooth rod insulatively fixed to said frame and having an axis parallel to said bore, said second electrode being so positioned and the relative size of said two electrodes being such that when the back face of said ram approaches said frame, said second electrode continues down the bore of said first electrode thereby changing the capacitance of said detector which is registered by said indicating means.
Claim 3
Dependent Claim
27 words
A press as claimed in claim 1 wherein the bore is a cavity in the back face of said ram and second electrode projects from said frame.
Claim 4
Dependent Claim
38 words
A press as claimed in claim 1 wherein said first electrode is in the form of an annular piston projecting from the back of said ram, said second electrode being positioned coaxially within a cavity in said frame.
Claim 5
Dependent Claim
67 words
A press as claimed in claim 3 wherein said second electrode is insulatively fixedly mounted at the bottom of a cylindrical tube positioned in said cavity, said second electrode being coaxial with said cylindrical tube and spaced from the inner wall thereof, and said anNular piston being so dimensioned as to linearly slide along said coaxial axis in said space between said second electrode and inner wall.
Claim 6
Dependent Claim
77 words
A press as claimed in claim 2 wherein the press has two counteracting rams and each ram is actuated by a piston and cylinder arrangement, a passageway for liquid interconnecting the cylinders of each piston, a capacitive detector for each ram, and a valve device connecting passages from each cylinder to a liquid source, pumping means, and said indicator means so that either detector can actuate the valve means and thereby control the position of said rams.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |