US4217753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacturing of a metallic bushing for a bearing of timepieces and of small mechanics and bushing obtained by carrying out this method
Assignee: Kif Parechoc SA
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Filing: 1978-12-18
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Granted: 1980-08-19
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Expires: 1998-12-18
Abstract
Abstract A method of making a bushing and a bushing made thereby for use as the bearing of a timepiece or the like, in which a sheet of metal is stamped to form a cambered disc, a central passageway is formed in the cambered disc by stamping in a direction from the concave to the convex surface of the disc so that any burr formed will be on the convex surface, and tumbling the cambered disc in a polishing drum to remove the burr. The disc so made is adapted to accept in the central passageway and in a direction from the concave to the convex surface a rotating shaft to be journalled therein so that any burr remaining at the convex surface is folded away from the central passageway when the shaft is engaged therein.
Inventors
- 👤 Edouard Loretan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:40
CPC Classifications
G; G04; G04B; G04B31/00; G04B31/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49579; Y10T29/49636; Y10T29/49643; Y10T29/49645
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A method of making a metallic bushing for use as the bearing of a timepiece or the like, the bushing comprising a thin cambered disc having a central passageway for receiving in a direction from the concave surface of the cambered disc to the convex surface of the cambered disc a rotating shaft to be journalled therein, said method comprising: A. stamping the disc from sheet metal and forming the camber during the stamping process; B. piercing the passageway by stamping in a direction from the concave surface of the disc to the convex surface of the disc so that any burr formed will be formed on the convex surface; and C. tumbling the disc in a polishing drum to remove the burr.
Claim 2
Independent Claim
123 words
A method of making a metallic bushing for use as the bearing of a timepiece or the like, the bushing comprising a thin cambered disc having a central passageway for receiving in a direction from the concave surface of the cambered disc to the convex surface of the cambered disc a rotating shaft to be journalled therein, said method comprising: A. stamping the disc from sheet metal and forming the camber during the stamping process; B. piercing the passageway by stamping in a direction from the concave surface of the disc to the convex surface of the disc so that any burr formed will be formed on the convex surface; and C. tumbling the disc in a polishing drum to remove the burr.
Claim 3
Dependent Claim
22 words
The method as claimed in claim 1 in which the steps of stamping the disc and piercing the passageway are performed simultaneously.
Claim 4
Dependent Claim
120 words
A metallic bushing for use as the bearing of a timepiece or the like, the bushing comprising: a thin cambered disc having a central passageway for receiving in a direction from the concave surface of the disc to the convex surface of the disc a rotating shaft to be journalled therein, the disc being formed from a sheet of metal by stamping with the camber of the disc being formed during the stamping of the disc, the passageway being pierced by stamping from the concave surface of the disc to the convex surface of the disc so that any burr formed will be on the convex surface, and the disc being tumbled in a polishing drum to remove the burr.
Claim 5
Dependent Claim
120 words
A metallic bushing for use as the bearing of a timepiece or the like, the bushing comprising: a thin cambered disc having a central passageway for receiving in a direction from the concave surface of the disc to the convex surface of the disc a rotating shaft to be journalled therein, the disc being formed from a sheet of metal by stamping with the camber of the disc being formed during the stamping of the disc, the passageway being pierced by stamping from the concave surface of the disc to the convex surface of the disc so that any burr formed will be on the convex surface, and the disc being tumbled in a polishing drum to remove the burr.
Claim 6
Dependent Claim
24 words
The bushing as claimed in claim 3 in which the cambered disc includes a peripheral edge protruding from the convex surface of the disc.
Claim 7
Dependent Claim
16 words
The bushing as claimed in claim 4 in which the peripheral edge is of frusto-conical shape.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |