Patent US3775580A successfully refreshed from Google Patents.
US3775580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature electrode clamp and guide for electric-spark machining
Assignee: STEREMAT VEB
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Filing: 1972-06-06
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Granted: 1973-11-27
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Expires: 1992-06-06
Abstract
Abstract A clamp and guide structure for subminiature electrodes for electric spark machining in which the clamp is comprised of a tubular member having one relatively fixed clamping jaw and one resilient jaw. The jaws have semi-circular positioning grooves for the electrode. A subminiature glass guide is aligned with the jaws for guiding the electrode, the length of the guiding duct in the guide being several times as large as the diameter of the electrode.
Inventors
- 👤 K Scherbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/265
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A device for clamping and guiding subminiature electrodes for an electric spark machining apparatus for metal workpieces, said device comprising a subminiature clamping dog comprised of an eccentric hollow shaft having on one end thereof a pair of clamping jaws, said clamping jaws and shaft forming a unitary element, one of said jaws being formed as an extension of the thicker wall of said shaft and being rigid with respect to the remainder of said shaft, the other of said jaws being connected to the remainder of said shaft by the thinner wall thereof to permit resilient swinging of said other jaw, said jaw having axially extending semicircular positioning grooves therebetween for receiving an electrode.
Claim 2
Independent Claim
115 words
A device for clamping and guiding subminiature electrodes for an electric spark machining apparatus for metal workpieces, said device comprising a subminiature clamping dog comprised of an eccentric hollow shaft having on one end thereof a pair of clamping jaws, said clamping jaws and shaft forming a unitary element, one of said jaws being formed as an extension of the thicker wall of said shaft and being rigid with respect to the remainder of said shaft, the other of said jaws being connected to the remainder of said shaft by the thinner wall thereof to permit resilient swinging of said other jaw, said jaw having axially extending semicircular positioning grooves therebetween for receiving an electrode.
Claim 3
Dependent Claim
57 words
The device of claim 1 further comprising a subminiature glass guide element having a guiding duct that is of a length which is a multiple of the diameter of said electrode, said guide element being positioned axially with respect to said shaft whereby an electrode extending from said jaws extends through said guide element to a workpiece.
Claim 4
Dependent Claim
60 words
The device of claim 2 wherein the guiding duct has an introducing funnel with a cone angle of 90* at the end thereof toward said jaws, the other end of said guide element being externally tapered inwardly toward said end at a cone angle of 90* and terminating in an end plane at said other end of said guide element.
Claim 5
Dependent Claim
24 words
The device of claim 2 wherein said guiding duct of said subminiature glass guiding element has a diameter permitting free movement of said electrode.
Claim 6
Dependent Claim
24 words
The device of claim 1 wherein said jaws are separated by a slot having a constant width smaller than the diameter of said electrode.
Claim 7
Dependent Claim
37 words
The device of claim 5 wherein said shaft has a pair of opposite rectangular openings in the walls thereof at the end of said slot at which said jaws are connected to the remainder of said shaft.
Claim 8
Dependent Claim
18 words
The device of claim 5 further comprising clamping means mounted on said shaft for urging said jaws together.
Claim 9
Dependent Claim
47 words
The device of claim 7 wherein said clamping means comprises a clamping screw extending transversely through said shaft in the wall portion thereof between said rectangular openings, said clamping screw having an aperture extending therethrough axially with respect to said shaft and aligned with said positioning grooves.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |