US3921777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction disc
Assignee: Valeo SE
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Filing: 1973-11-27
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Granted: 1975-11-25
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Expires: 1993-11-27
Abstract
Abstract A friction disc comprising a support of generally plane shape, having on its periphery curved portions which can be flattened, while offering elastic resistance, when the disc is subjected to a clamping action, friction linings disposed on each side of the support and secured by rivets to the curved portions thereof so that the thickness of the disc and the linings is elastically variable with a lower limit corresponding to complete flattening of the curved portions of the support, and stop means interconnecting the linings and acting in a direction parallel to the axis of the disc to define an upper limit for the thickness of the disc at the linings.
Inventors
- 👤 Michel Rist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:55
CPC Classifications
F; F16; F16D; F16D13/00; F16D13/58; F16D13/60; F16D13/64; F16D2013/642
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
In a friction disc comprising a generally plane support having curved portions at its periphery resiliently flattenable upon a clamping action on the disc, friction linings disposed on opposite sides of said support and each lining being composed of only one layer of homogeneous material, rivets securing said linings to said curved portions, each said rivet having a first head and a shoulder clamping therebetween a portion of one lining and a said support curved portion and a second head defining an upper limit of the disc thickness; the improvement in which the other lining has a bearing surface against which the said second head abuts directly for defining said upper limit, said bearing surface being defined by an annular portion of the material of said other lining, said annular portion being of a thickness less than the thickness of said other lining.
Claim 2
Dependent Claim
143 words
In a friction disc comprising a generally plane support having curved portions at its periphery resiliently flattenable upon a clamping action on the disc, friction linings disposed on opposite sides of said support and each lining being composed of only one layer of homogeneous material, rivets securing said linings to said curved portions, each said rivet having a first head and a shoulder clamping therebetween a portion of one lining and a said support curved portion and a second head defining an upper limit of the disc thickness; the improvement in which the other lining has a bearing surface against which the said second head abuts directly for defining said upper limit, said bearing surface being defined by an annular portion of the material of said other lining, said annular portion being of a thickness less than the thickness of said other lining.
Claim 3
Dependent Claim
28 words
A friction disc as claimed in claim 1 wherein said first head and said shoulder have substantially the same diameter while said second head has a larger diameter.
Claim 4
Dependent Claim
14 words
A friction disc as claimed in claim 1 wherein said second head is cup-shaped.
Claim 5
Dependent Claim
36 words
A friction disc as claimed in claim 1, there being but a single said support between two said friction linings, said support comprising, in the region between said linings, a single thickness of undulating metal sheet.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |