US3776336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw operator for clutch with adjustable stop
Assignee: Mefina SA
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Filing: 1972-04-06
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Granted: 1973-12-04
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Expires: 1992-04-06
Abstract
Abstract A shaft has at one end, a threaded portion, a cylindrical portion and a drive bush fixed thereto. The fly-wheel is mounted to rotate on the cylindrical portion of the shaft, a clamping block being screwed on the threaded portion to clamp the flywheel against the drive bush to lock it in rotation on the shaft. The possible angle of rotation of the block on the shaft is limited by a screw threaded in any one of at least two bores of the block to come into cooperation with a stop finger fast in rotation to the shaft and extending radially with respect to the latter. The bores are parallel to the axis of the shaft. The screw can be positioned in that one of the bores which provides the most favourable angle of rotation of the block between the coupling position of the fly-wheel and its uncoupled position.
Inventors
- 👤 M Fresard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/30; D05B69/34; F; F16; F16D; F16D1/00; F16D1/06; Y; Y10; Y10S; Y10S411/00; Y10S411/999
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
Device for the rotary coupling of a fly-wheel to a shaft, especially in a sewing machine, in which the shaft has, at one of its ends, a threaded portion, a cylindrical portion and a drive bush fixed to said cylindrical portion, the fly-wheel being mounted to rotate on the cylindrical portion of said shaft, a clamping block screwed on the threaded portion of said shaft to clamp the fly-wheel against the drive bush to lock said fly-wheel on the shaft for rotation therewith, saiD block having at least two bores parallel to the axis of the shaft, a screw threaded in one of said bores, and a stop finger fixed to said shaft and extending radially with respect thereto, the possible angle of rotation of the block on the shaft being limited by said screw coming into contact with said stop finger, said bores arranged to receive said screw to permit its positioning as desired in that particular one of the bores which provides the most favourable angle of rotation of the block between the coupling position of the fly-wheel and its uncoupled position.
Claim 2
Dependent Claim
184 words
Device for the rotary coupling of a fly-wheel to a shaft, especially in a sewing machine, in which the shaft has, at one of its ends, a threaded portion, a cylindrical portion and a drive bush fixed to said cylindrical portion, the fly-wheel being mounted to rotate on the cylindrical portion of said shaft, a clamping block screwed on the threaded portion of said shaft to clamp the fly-wheel against the drive bush to lock said fly-wheel on the shaft for rotation therewith, saiD block having at least two bores parallel to the axis of the shaft, a screw threaded in one of said bores, and a stop finger fixed to said shaft and extending radially with respect thereto, the possible angle of rotation of the block on the shaft being limited by said screw coming into contact with said stop finger, said bores arranged to receive said screw to permit its positioning as desired in that particular one of the bores which provides the most favourable angle of rotation of the block between the coupling position of the fly-wheel and its uncoupled position.
Claim 3
Dependent Claim
43 words
Device according to claim 1, wherein each bore of the block has a cylindrical portion of larger diameter on the outer side of the block, said cylindrical portion serving as a housing for the head of the screw when engaged in said bore.
Claim 4
Dependent Claim
128 words
Device according to claim 1, wherein each bore of the block is constituted by three cylindrical portions, of diameter increasing from the inner surface to the outer surface, said cylindrical portions being connected between themselves by conical portions, the screw having a cylindrical portion of a diameter corresponding to the cylindrical portion of smallest diameter of the bore, the cylindrical portion of the screw being connected to a threaded portion of the latter by a conical portion of the same conicity as the conical portions of the bore, so as to ensure precise guiding of the screw in the bore in its introduction into the latter and enabling female threading to be formed in the bore by screwing the screw into the intermediate cylindrical portion of the bore.
Claim 5
Dependent Claim
47 words
Device according to claim 1, wherein the block has on the outer side a flat surface at which said bores open, and a disc covering said flat surface, said disc having a hole adapted to be positioned opposite the bore selected for the introduction of the screw.
Claim 6
Dependent Claim
47 words
Device according to claim 2, wherein the block has on the outer side a flat surface at which said bores open, and a disc covering said flat surface, said disc having a hole adapted to be positioned opposite the bore selected for the introduction of the screw.
Claim 7
Dependent Claim
54 words
Device according to claim 3, wherein the block has on the outer side a flat surface at which said bores open, and a disc covering said flat surface, said disc having a hole of smaller diameter than the bore and adapted to be positioned opposite the bore selected for the introduction of the screw.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |