US3851867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic actuator control apparatus
Assignee: Motors Liquidation Co
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Filing: 1973-07-09
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Granted: 1974-12-03
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Expires: 1993-07-09
Abstract
Abstract Control apparatus for a pneumatic actuator of the type having a cylinder tube portion, a piston slidably disposed in the cylinder tube portion and dividing the latter into a pair of chambers filled with a pressurized gas, a piston rod connected to the piston, a valve on the piston for opening and closing a passage between the chambers, and a control rod on the piston rod for moving the valve between open and closed positions, the control apparatus including a support member on the piston rod, an actuator pivotally supported on the support member and having a cam slot therein, and a follower pin rigidly attached to the control rod and slidably engaging the cam slot. When the actuator lever is pivoted the cam slot imparts bodily movement to the follower pin and hence to the control rod for opening and closing the valve and the pivot axis of the actuator lever is offset from the axis of the control rod so that a turning moment is developed on the actuator lever tending to maintain the latter in an unlocking position.
Inventors
- 👤 J Fricko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:36
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
297 words
In a pneumatic actuator assembly for effecting relative movement between a pair of structural elements, said actuator assembly being of the type including a cylinder tube portion disposed on one of said structural elements, a piston slidably disposed in said cylinder tube portion and dividing the latter into a pair of chambers, a piston rod slidably disposed on said cylinder tube portion and operatively connected to said piston, means on said piston defining a passage between said pair of chambers, a valve disposed on said piston for movement between an open position and a closed position blocking said passage, a control rod operatively connected to said valve and disposed on said piston rod for reciprocation between an extended position and a retracted position corresponding respectively to the open and the closed position of said valve, and a pressurized gaseous medium in said chambers for effecting movement of said piston rod in the open position of said valve, the improvement comprising, a support member disposed between said piston rod and the other of said pair of structural elements so that movement of said piston rod relative to said cylinder tube portion effects relative movement between said pair of structural elements, an actuator lever disposed on said support member for rotation about an axis of said support member between a locking position and an unlocking position, means on said actuator lever defining a cam slot, a cam follower, means rigidly attaching said cam follower to said control rod, said cam follower engaging said cam slot so that movement of said actuator lever from the locking to the unlocking position effects concurrent movement of said control rod from the retracted to the extended position, and means associated with said actuator lever for maintaining the latter in the unlocking position thereof.
Claim 2
Dependent Claim
297 words
In a pneumatic actuator assembly for effecting relative movement between a pair of structural elements, said actuator assembly being of the type including a cylinder tube portion disposed on one of said structural elements, a piston slidably disposed in said cylinder tube portion and dividing the latter into a pair of chambers, a piston rod slidably disposed on said cylinder tube portion and operatively connected to said piston, means on said piston defining a passage between said pair of chambers, a valve disposed on said piston for movement between an open position and a closed position blocking said passage, a control rod operatively connected to said valve and disposed on said piston rod for reciprocation between an extended position and a retracted position corresponding respectively to the open and the closed position of said valve, and a pressurized gaseous medium in said chambers for effecting movement of said piston rod in the open position of said valve, the improvement comprising, a support member disposed between said piston rod and the other of said pair of structural elements so that movement of said piston rod relative to said cylinder tube portion effects relative movement between said pair of structural elements, an actuator lever disposed on said support member for rotation about an axis of said support member between a locking position and an unlocking position, means on said actuator lever defining a cam slot, a cam follower, means rigidly attaching said cam follower to said control rod, said cam follower engaging said cam slot so that movement of said actuator lever from the locking to the unlocking position effects concurrent movement of said control rod from the retracted to the extended position, and means associated with said actuator lever for maintaining the latter in the unlocking position thereof.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |