Patent US5642443A successfully refreshed from Google Patents.
Patent US6741698B1 successfully refreshed from Google Patents.
US3592153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine positioning means
Assignee: W J Clarkson Ltd
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Filing: 1969-03-17
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Granted: 1971-07-13
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Expires: 1989-03-17
Abstract
Abstract The invention comprises a device for automatically repositioning a machine if it comes to rest in an unwanted position, said device including a fluid power operated piston-cylinder unit adapted to give rotary motion to a machine shaft, a fluid pressure system including a control valve, a sensing unit on the shaft for controlling the valve, and means for bringing the sensing unit into operation when a braking action brings the machine to rest. The sensing unit is preferably electrical and the device is eminently applicable to sewing machines for positioning the needle.
Inventors
- 👤 Gregory John Margereson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:20
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A device for positioning a belt-driven shaft of a machine in a desired angular position, said machine including brake means for stopping said shaft, said device comprising a main fluid power operated piston-cylinder unit, a piston rod carrying said piston, a belt-gripping device carried by said piston rod, means for controlling said belt-gripping device to selectively grip and release said belt, a valve, a pressurized fluid system contRolled by said valve for operating said unit, said control means including a sensing unit operated by rotation of said shaft, said sensing unit including means to control said valve, and control means for said sensing unit arranged to bring said sensing unit into an operative condition when said machine braking means are operated, whereby if said shaft comes to rest out of said desired angular position, said sensing unit operates said valve and causes said belt-gripping device to grip said belt and said piston-cylinder unit to operate to move said belt-gripping device along the path of said belt and thus to drive said gripped belt to move said shaft into said desired angular position.
Claim 2
Independent Claim
182 words
A device for positioning a belt-driven shaft of a machine in a desired angular position, said machine including brake means for stopping said shaft, said device comprising a main fluid power operated piston-cylinder unit, a piston rod carrying said piston, a belt-gripping device carried by said piston rod, means for controlling said belt-gripping device to selectively grip and release said belt, a valve, a pressurized fluid system contRolled by said valve for operating said unit, said control means including a sensing unit operated by rotation of said shaft, said sensing unit including means to control said valve, and control means for said sensing unit arranged to bring said sensing unit into an operative condition when said machine braking means are operated, whereby if said shaft comes to rest out of said desired angular position, said sensing unit operates said valve and causes said belt-gripping device to grip said belt and said piston-cylinder unit to operate to move said belt-gripping device along the path of said belt and thus to drive said gripped belt to move said shaft into said desired angular position.
Claim 3
Dependent Claim
40 words
A device according to claim 1, wherein said belt-gripping device comprises an auxiliary fluid operated piston-cylinder unit and a cooperative member, the piston of said unit being arranged to trap said belt against said cooperative member to grip said belt.
Claim 4
Dependent Claim
73 words
A device according to claim 1, wherein said belt-gripping device comprises a bifurcated member and an auxiliary fluid operated piston-cylinder unit, both carried by said piston rod of said main unit, said bifurcated member and auxiliary unit forming a gap therebetween for free passage of said belt, the piston of said auxiliary unit facing into said gap for the purpose of trapping said belt against said bifurcated member when said piston is extended.
Claim 5
Dependent Claim
22 words
A device according to claim 3, wherein fluid pressure to said auxiliary unit is controlled by said valve controlling said main unit.
Claim 6
Dependent Claim
54 words
A device according to claim 4, including a second auxiliary piston-cylinder unit controlled by said valve, said brake means being manually controlled, said second auxiliary unit being positioned adjacent said manually controlled brake and controlled to offset at least some of the manual effort applied to the brake when the machine is being stopped.
Claim 7
Dependent Claim
70 words
A device according to claim 5, wherein said valve is spring loaded lengthwise in one direction and fluid-pressure operated in the opposite direction, and including a solenoid controlled valve for directing fluid pressure selectively to operate said valve in said opposite direction against said spring loading, or to ports in said valve for passage to said piston-cylinder units when said spring loading has shifted said valve in said one direction.
Claim 8
Dependent Claim
128 words
A device according to claim 1, wherein said sensing unit comprises an electrical slip ring unit controlling current feed to two electrical brush contacts, each associated with a different one of two desired angular positions of said shaft, said electrical brush contacts controlling a low voltage electrical circuit including a switch responsive to operation of said machine braking means to place said circuit in operative condition, said valve control means including a solenoid, a manually operated selection switch unit for connecting a desired one of said brush contacts into said circuit, a latch relay, and a manually operated overriding switch unit connected to operate said latch relay to connect the other of said brush contacts into said circuit for causing a further rotary motion of said machine shaft.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |