Patent US3815929A successfully refreshed from Google Patents.
US3815929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operable chuck
Assignee: Forkardt Deutschland GmbH
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Filing: 1972-10-12
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Granted: 1974-06-11
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Expires: 1992-10-12
Abstract
Abstract A power operable chuck for turning machines with a pressure fluid operable cylinder piston assembly operatively connected to and rotatable with the chuck for acting upon the clamping jaws of the chuck, the chucking force exerted by the cylinder piston assembly upon the clamping jaws being automatically variable in conformity with exterior forces, e.g., the centrifugal force or the force exerted upon the cutting tool in the chuck, by correspondingly varying the fluid pressure in the fluid pressure operable cylinder piston assembly.
Inventors
- 👤 J Steinberger
- 👤 H Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:21
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/24; B23B31/30; B23B31/302; Y; Y10; Y10T; Y10T279/00; Y10T279/12; Y10T279/1208; Y10T82/00; Y10T82/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A chuck unit for turning machines, which includes: a rotatable chuck having a plurality of clamping jaws, a pressure fluid operable cylinder piston assembly rotatable with said chuck and connected thereto for actuating said clamping jaws, and control means operatively connected to said pressure fluid operable cylinder piston assembly and responsive to forces affecting the originally set clamping forces exerted upon a workpiece in the jaws of the chuck at the standstill thereof for bringing about a change in pressure in said cylinder piston assembly to thereby correspondingly change the clamping pressure of said chuck.
Claim 2
Dependent Claim
95 words
A chuck unit for turning machines, which includes: a rotatable chuck having a plurality of clamping jaws, a pressure fluid operable cylinder piston assembly rotatable with said chuck and connected thereto for actuating said clamping jaws, and control means operatively connected to said pressure fluid operable cylinder piston assembly and responsive to forces affecting the originally set clamping forces exerted upon a workpiece in the jaws of the chuck at the standstill thereof for bringing about a change in pressure in said cylinder piston assembly to thereby correspondingly change the clamping pressure of said chuck.
Claim 3
Dependent Claim
69 words
A chuck unit according to claim 1, which includes pressure control valve means for controlling the pressure in said cylinder piston assembly, and in which said control means include a tachometer operatively connected to said chuck so as to be rotatable at a speed proportional to the speed of said chuck, and also include electronic control means operatively connected to said tachometer and to said pressure control valve means.
Claim 4
Dependent Claim
67 words
A chuck unit according to claim 1, which includes pressure control valve means for controlling the pressure in said cylinder piston assembly, and in which said control means include a meter for ascertaining the force acting upon a chip removing tool in said chuck during its chip removing action, and also include electronic control means operatively connected to said meter and to said pressure control valve means.
Claim 5
Dependent Claim
36 words
A chuck unit according to claim 2, which includes a pump unit for supplying pressure fluid to said cylinder piston assembly, and in which said pressure control valve means forms a part of said pump unit.
Claim 6
Dependent Claim
36 words
A chuck unit according to claim 3, which includes a pump unit for supplying pressure fluid to said cylinder piston assembly, and in which said pressure control valve means foRms a part of said pump unit.
Claim 7
Dependent Claim
38 words
A chuck unit according to claim 1, in which said control means includes means for setting the initiation of effecting a change in pressure in said cylinder piston assembly in conformity with different characteristics of the chuck unit.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |