US3709105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure operated rotary actuators
Assignee: Individual
•
Filing: 1971-07-06
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Granted: 1973-01-09
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Expires: 1991-07-06
Abstract
Abstract A fluid pressure rotary actuator comprises a rotatable output shaft, a cylinder in which two pistons are movable simultaneously in opposite directions by fluid pressure acting on at least one of them, and a chain extending from one piston to a rod fixed to the other piston and passing through the first piston, the chain being wrapped around a cylindrical surface on the output shaft so that its longitudinal movement by the pistons rotates the output shaft.
Inventors
- 👤 J Ridley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:25
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/02; F15B15/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A fluid pressure rotary actuator comprising a housing, an output shaft rotatably mounted in said housing, a cylinder secured to said housing and disposed with its axis tangential to a circle about the axis of said output shaft, first and second pistons mounted for slidable movement within said cylinder for simultaneous actuation in opposite directions by fluid pressure within said cylinder, a piston rod secured at one end to said first piston and passing through an aperture in said second piston so that its other end projects on the opposite side of said second piston to said first piston, and transmission means for converting rectilinear movement of said pistons into rotary movement of said output shaft, said transmission means comprising pivotally connected link members forming a tension communication between said projected end of the piston rod and said second piston, a peripheral surface on said output shaft with which said transmission means make peripheral embracing contact, and at least one guide pulley over which the said transmission means passes between the output shaft and one of the transmission means end connections.
Claim 2
Dependent Claim
181 words
A fluid pressure rotary actuator comprising a housing, an output shaft rotatably mounted in said housing, a cylinder secured to said housing and disposed with its axis tangential to a circle about the axis of said output shaft, first and second pistons mounted for slidable movement within said cylinder for simultaneous actuation in opposite directions by fluid pressure within said cylinder, a piston rod secured at one end to said first piston and passing through an aperture in said second piston so that its other end projects on the opposite side of said second piston to said first piston, and transmission means for converting rectilinear movement of said pistons into rotary movement of said output shaft, said transmission means comprising pivotally connected link members forming a tension communication between said projected end of the piston rod and said second piston, a peripheral surface on said output shaft with which said transmission means make peripheral embracing contact, and at least one guide pulley over which the said transmission means passes between the output shaft and one of the transmission means end connections.
Claim 3
Dependent Claim
21 words
A fluid pressure rotary actuator according to claim 1, wherein the assembly of pivotally connected link members comprises pivoted link chain.
Claim 4
Dependent Claim
17 words
A fluid pressure rotary actuator according to claim 2, wherein the pivoted link chain is leaf chain.
Claim 5
Dependent Claim
21 words
A fluid pressure actuator according to claim 1, wherein a fixed partition is provided in the cylinder between the two pistons.
Claim 6
Dependent Claim
23 words
A fluid pressure actuator according to claim 3, wherein the pivoted link chain is connected to an anchorage member on the output shaft.
Claim 7
Dependent Claim
36 words
A Fluid pressure actuator according to claim 5, wherein the pivoted link chain comprises two separate portions each connected at one end to the anchorage member and at the other end to one of the pistons.
Claim 8
Dependent Claim
70 words
The fluid pressure actuator according to claim 1, including a selector valve for connecting the space between the two pistons to a source of fluid pressure or to drain and means for reversing the power actuation by communicating fluid pressure to an opposite side of the piston which is actuated in a direction effecting forcible tensioning of said link members and simultaneously connecting the space between said pistons to drain.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |