US4284285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-adjusting rotary chuck
Assignee: Lear Automotive Dearborn Inc
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Filing: 1979-05-07
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Granted: 1981-08-18
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Expires: 1999-05-07
Abstract
Abstract A chuck having self-closing jaws, and a key-threaded rotary ring to engage said jaws in working contact with a tool within their grasp or to disengage said jaws so as to permit their free movement. The jaws themselves are such that the act of performing work with a tool held by said jaws increases the holding pressure exerted by said jaws on said tool.
Inventors
- 👤 Friedrich P. Futter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:40
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17615; Y10T279/17623; Y10T279/17632; Y10T279/32; Y10T279/34; Y10T279/3431; Y10T279/3451
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
In a chuck for releasably holding an object such as a tool or workpiece, including circumferentially spaced jaws for grasping said object which are movable radially outwardly to an open position to permit insertion of said object therebetween, and adapted to move radially inwardly to an object-grasping position, and means for adjusting the radial position of said jaws to grasp objects of varying size, the improvements comprising: (a) inclined key threads on said jaws; (b) a rotatable jaw-positioning collar around said jaws, including inclined, inwardly extending, circumferentially spaced key threads adapted to cooperatively engage and disengage the key threads on said jaws, which collar (i) urges said jaws axially outwardly and radially inwardly to said object-grasping position when said collar is rotated to engage said key threads, and (ii) permits free axial and radial movement of said jaws to said open position when said collar is rotated to disengage said key threads; (c) means for rotating said collar to engage and disengage said key threads; and (d) means for normally yieldably urging said jaws axially outwardly and radially inwardly when said key threads are disengaged.
Claim 2
Dependent Claim
185 words
In a chuck for releasably holding an object such as a tool or workpiece, including circumferentially spaced jaws for grasping said object which are movable radially outwardly to an open position to permit insertion of said object therebetween, and adapted to move radially inwardly to an object-grasping position, and means for adjusting the radial position of said jaws to grasp objects of varying size, the improvements comprising: (a) inclined key threads on said jaws; (b) a rotatable jaw-positioning collar around said jaws, including inclined, inwardly extending, circumferentially spaced key threads adapted to cooperatively engage and disengage the key threads on said jaws, which collar (i) urges said jaws axially outwardly and radially inwardly to said object-grasping position when said collar is rotated to engage said key threads, and (ii) permits free axial and radial movement of said jaws to said open position when said collar is rotated to disengage said key threads; (c) means for rotating said collar to engage and disengage said key threads; and (d) means for normally yieldably urging said jaws axially outwardly and radially inwardly when said key threads are disengaged.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |