Patent US4133544A successfully refreshed from Google Patents.
US4133544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable collet in double diaphragm chuck
Assignee: DPBG Corp (DPBG) A CORP OF
•
Filing: 1977-10-25
•
Granted: 1979-01-09
•
Expires: 1997-10-25
Abstract
Abstract A work holder adapted to minimize clamp distortion of a workpiece by providing a movable metallic collet encompassing the workpiece, and a plurality of front and rear jaws to grip the metallic collet with different pressure forces at the front and rear sections of the collet.
Inventors
- 👤 James V. Halvorsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:04
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/32; B23B31/10; B23B31/12; B23B31/20; B23B31/201; B23B31/207; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17418; Y10T279/17435; Y10T279/19; Y10T279/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A work holder adapted to minimize clamp distortion of a workpiece comprising: (a) a spindle; (b) a housing mounted on said spindle; (c) a pair of front and rear diaphragms mounted in said housing; (d) a plurality of jaws mounted on each of said front and rear diaphragms; and (e) a metallic collet adapted to grip a workpiece mounted within said plurality of jaws; whereby the gripping forces on said front and rear jaw assemblies are adapted to be adjustably varied.
Claim 2
Dependent Claim
81 words
A work holder adapted to minimize clamp distortion of a workpiece comprising: (a) a spindle; (b) a housing mounted on said spindle; (c) a pair of front and rear diaphragms mounted in said housing; (d) a plurality of jaws mounted on each of said front and rear diaphragms; and (e) a metallic collet adapted to grip a workpiece mounted within said plurality of jaws; whereby the gripping forces on said front and rear jaw assemblies are adapted to be adjustably varied.
References Cited (Backward Citations)
US2719721A
Cited
US3495844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |