Patent US3863940A successfully refreshed from Google Patents.
US3863940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide opening collet
Assignee: Individual
•
Filing: 1973-04-04
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Granted: 1975-02-04
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Expires: 1993-04-04
Abstract
Abstract A wide opening collet for use in machine tools which provides a wide work-piece receiving opening with a minimum axial motion, the opening action being accomplished quickly for use in automatic machining operations.
Inventors
- 👤 Philip T Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:50
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/20; B23B31/201; B23B31/202; B23B2231/00; B23B2231/20; B23B2231/2008; B23B2231/2027; B23B2231/2043; B23B2231/2045; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17291; Y10T279/17307; Y10T279/17411; Y10T279/17487; Y10T279/17521
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A spring leaf collet having a longitudinal axis comprising: a plurality of resilient leaves mutually attached at one end of said collet and separated at the other end; a first annular cam surface on each of said leaves adjacent the other end of said collet, said surface being formed at a predetermined angle with respect to the longitudinal axis of the collet; a second annular cam surface adjacent said first cam surface and at a substantially larger angle than said first surface with respect to said longitudinal axis; a third cam surface adjacent said second cam surface, said third surface being formed at a lower angle than said second surface with respect to the longitudinal axis and forming an annular conical surface of smaller diameter than the surface formed by said second surface; and said third surface being formed at generally the same angle as said first surface.
Claim 2
Dependent Claim
148 words
A spring leaf collet having a longitudinal axis comprising: a plurality of resilient leaves mutually attached at one end of said collet and separated at the other end; a first annular cam surface on each of said leaves adjacent the other end of said collet, said surface being formed at a predetermined angle with respect to the longitudinal axis of the collet; a second annular cam surface adjacent said first cam surface and at a substantially larger angle than said first surface with respect to said longitudinal axis; a third cam surface adjacent said second cam surface, said third surface being formed at a lower angle than said second surface with respect to the longitudinal axis and forming an annular conical surface of smaller diameter than the surface formed by said second surface; and said third surface being formed at generally the same angle as said first surface.
Claim 3
Dependent Claim
17 words
A spring leaf collet according to claim 1 wherein said second camming surface is an arcuate surface.
Claim 4
Dependent Claim
65 words
A spring leaf collet according to claim 2 wherein said arcuate surface is an annular arcuate surface the arc of said surface being tangent to the outside diameter surface of said collet at one end and at the other end adjacent the first cam surface tangent to a line at an angle substantially larger with respect to the longitudinal axis than the first camming surface.
Claim 5
Dependent Claim
24 words
A spring leaf collet according to claim 3 wherein the tangent angle of said arcuate surface adjacent said first cam surface is approximately 45*.
Claim 6
Dependent Claim
25 words
A spring leaf collet according to claim 4 wherein the angle of said first cam surface with respect to the longitudinal axis is approximately 15*.
Claim 7
Dependent Claim
30 words
A spring leaf collet according to claim 1 wherein said first and third cam surfaces are at an angle one-third of the second angle with respect to the longitudinal axis.
Claim 8
Dependent Claim
30 words
A spring leaf collet according to claim 6 wherein said first and third angles are approximately 15* and said first angle is approximately 45* with respect to said longitudinal axis.
Claim 9
Dependent Claim
22 words
A spring leaf collet according to claim 1 wherein said second surface is an arcuate surface connecting said first and third surfaces.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |