US3732783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid cylinder having self-locking means
Assignee: Individual
•
Filing: 1971-02-11
•
Granted: 1973-05-15
•
Expires: 1991-02-11
Abstract
Abstract A fluid cylinder having a tubular housing with a piston reciprocably mounted therein and capable of fluid pressure actuation in opposite directions. One side of the piston carries an actuating rod which slidably extends through one end of the tubular housing, while a coaxially aligned bore extending from the opposite side of the piston and into the actuating rod has a threaded surface adapted to receive a threaded member which, in turn, is rotatably carried at the other end of the tubular housing. The threaded surfaces of the piston bore and the rotatable threaded member engage in a self-locking relationship such that the piston is incapable of movement when subjected to fluid pressure unless the threaded member is initially and continually rotated. Means are provided for selectively rotating the threaded member upon fluid pressure actuation of the piston in either direction.
Inventors
- 👤 R Emenaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:23
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/261; F15B15/08; F15B15/14; F15B2015/1495
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
349 words
A fluid pressure operated actuator comprising: a tubular housing having an internal bor enclosed at its opposite ends; piston means axially reciprocally disposed in bore tubular housing bore and dividing said bore into two pressure chambers; means for communicating pressure fluid to one of said pressure chambers while exhausting the other of said pressure chambers to move said piston means in one direction in said tubular housing bore; an actuating rod carried by said piston means and extending from one side of said piston means through one enclosed end of said tubular housing; a member extending from the opposite side of said piston means and rotatably supported in the other enclosed end of said tubular housing, said member having a threaded portion engaging a mating threaded portion of the actuating rod carried by said piston means, the engaging threaded portion carried by said piston means and the threaded portion of said member being in a self-locking relationship such that said piston means is axially movable only when said one pressure chamber is communicated to said pressure fluid and said member is rotated relative to said piston means; non-locking means for rotating said member relative to said piston means, said non-locking means being carried by said other enclosed end of said tubular housing; and means coupling said non-locking means to said member such that said non-locking means and said member are rotatable together after a limited amount of independent rotational movement of said non-locking means relative to said member; said non-locking means for rotating said member relative to said piston means comprising a rotor carried by said member, an enclosed chamber formed in said other enclosed end of said tubular housing, said rotor hving a plurality of radially extending vane members which divide said last mentioned enclosed chamber into a plurality of subchambers; and a pair of ports, one of which is adapted to direct pressure fluid into said subchambers against said vane members to cause rotation of said rotor and thus said member in one angular direction, the other said ports being adapted to exhaust fluid from said subchambers.
Claim 2
Dependent Claim
349 words
A fluid pressure operated actuator comprising: a tubular housing having an internal bor enclosed at its opposite ends; piston means axially reciprocally disposed in bore tubular housing bore and dividing said bore into two pressure chambers; means for communicating pressure fluid to one of said pressure chambers while exhausting the other of said pressure chambers to move said piston means in one direction in said tubular housing bore; an actuating rod carried by said piston means and extending from one side of said piston means through one enclosed end of said tubular housing; a member extending from the opposite side of said piston means and rotatably supported in the other enclosed end of said tubular housing, said member having a threaded portion engaging a mating threaded portion of the actuating rod carried by said piston means, the engaging threaded portion carried by said piston means and the threaded portion of said member being in a self-locking relationship such that said piston means is axially movable only when said one pressure chamber is communicated to said pressure fluid and said member is rotated relative to said piston means; non-locking means for rotating said member relative to said piston means, said non-locking means being carried by said other enclosed end of said tubular housing; and means coupling said non-locking means to said member such that said non-locking means and said member are rotatable together after a limited amount of independent rotational movement of said non-locking means relative to said member; said non-locking means for rotating said member relative to said piston means comprising a rotor carried by said member, an enclosed chamber formed in said other enclosed end of said tubular housing, said rotor hving a plurality of radially extending vane members which divide said last mentioned enclosed chamber into a plurality of subchambers; and a pair of ports, one of which is adapted to direct pressure fluid into said subchambers against said vane members to cause rotation of said rotor and thus said member in one angular direction, the other said ports being adapted to exhaust fluid from said subchambers.
Claim 3
Dependent Claim
24 words
The fluid pressure operated actuator defined in claim 1 further comprising means for preventing relative rotation between said piston means and said tubular housing.
Claim 4
Dependent Claim
65 words
The fluid pressure operated actuator defined in claim 1 wherein said threaded portion carried by said piston means comprises a bore extending along the longitudinal axis of said actuating rod and opening to said opposite side of said piston means, a portion of said bore being threaded a selected distance, said rotatably supported member being in axial alignment with said last-mentioned bore and engaged therein.
Claim 5
Dependent Claim
47 words
The fluid pressure operated actuator defined in claim 3 wherein the product of the cosine of the pressure angle of the member and the tangent of the lead angle of the member is equal to or greater than the coefficient of friction of said engaged threaded portions.
Claim 6
Dependent Claim
157 words
The fluid pressure operated actuator defined in claim 1 wherein said coupling means comprises: a circular section formed on said member, said circular section having at least one radially extending motion transmitting portion, said rotor having a circular bore receiving said circular section such that said rotor is angularly slidable about said circular section, said rotor having a recessed portion opening to said rotor circular bore, said recessed portion receiving said motion transmitting portion, said recessed portion being so sized with respect to said motion transmitting portion to permit said rotor to rotate about said circular section a limited angular distance prior to engagement of a wall of said recessed portion with said motion transmitting portion as said rotor is rotated when one of said pair of ports is communicated to said fluid pressure, said member being rotated by said rotor only after said engagement between said motion transmitting portion and said wall of said recessed portion.
Claim 7
Dependent Claim
101 words
The fluid pressure operated actuator defined in claim 1 further comprising a source of fluid pressure; first directional control valve means adapted to connect said source of fluid pressure to said pressure chamber to cause said piston means to move in said one direction; and second directional control valve means operable simultaneously upon actuation of said first directional control valve means to communicate said source of fluid pressure to said one of said pair of ports to rotate said rotor and thus rotate said member in a direction which corresponds to said one direction of reciprocal movement of said piston means.
Claim 8
Dependent Claim
47 words
The fluid pressure operated actuator defined in claim 1 when the product of the cosine of the pressure angle of said member and the tangent of the lead angle of said member is equal to or greater than the coefficient of friction of said engaged threaded portions.
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |