US3839945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary actuator
Assignee: GREE HYDRAULICS OF CALIFORNIA Inc
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Filing: 1973-07-09
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Granted: 1974-10-08
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Expires: 1993-07-09
Abstract
Abstract The invention relates to a rotary actuator of the type having a movable vane positioned in an arcuate chamber and secured to and extending radially outward from a shaft extending coaxially with the axis of said arcuate chamber. The arcuate chamber forms a central part of a substantially U-shaped chamber having a pair of legs open at their outer end, each chamber receiving a deformable bladder having a closed end adapted to react against opposed ends of the vane, means being provided to permit fluid under pressure to charge said bladders to effect expansion of one of the bladders for consequent movement of said movable vane and the shaft to which it is secured with resultant compression of the other bladder.
Inventors
- 👤 A Jacobellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:35
CPC Classifications
F; F01; F01B; F01B19/00; F01B19/04; F15; F15B; F15B15/00; F15B15/08; F15B15/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
An inflatable bladder for a rotary actuator, said bladder having a substantially cylindrical inflatable body portion with an open end mounting flange portion and an end portion having a closed end, said end portion in its uninflated state being preformed so that its axis extends at substantially an obtuse angle with respect to the longitudinal axis of said body portion, so that the outside walls on the opposite sides of said end portion are concave and convex respectively and the outside wall of the closed end thereof being convex, the wall thickness of the cylindrical body portion being substantially uniform along its entire length and the wall thickness of the convex side wall and closed end being less than that of the concave side wall; whereupon when said bladder is pressurized the thinner wall will stretch at a faster rate than the thicker wall so that the closed end of the bladder will tend to move in an arcuate path.
Claim 2
Dependent Claim
160 words
An inflatable bladder for a rotary actuator, said bladder having a substantially cylindrical inflatable body portion with an open end mounting flange portion and an end portion having a closed end, said end portion in its uninflated state being preformed so that its axis extends at substantially an obtuse angle with respect to the longitudinal axis of said body portion, so that the outside walls on the opposite sides of said end portion are concave and convex respectively and the outside wall of the closed end thereof being convex, the wall thickness of the cylindrical body portion being substantially uniform along its entire length and the wall thickness of the convex side wall and closed end being less than that of the concave side wall; whereupon when said bladder is pressurized the thinner wall will stretch at a faster rate than the thicker wall so that the closed end of the bladder will tend to move in an arcuate path.
Claim 3
Dependent Claim
49 words
The combination set forth in claim 1 in which, the wall thickness is maximum at the mid portion of the concave side and substantially progressively decreases along each side of said mid portion of the concave side from such mid portion to the mid portion of the convex side.
Claim 4
Dependent Claim
17 words
The combination set forth in claim 1 in which the closed end of the bladder is rounded.
Claim 5
Dependent Claim
201 words
As an article of manufacture an inflatable bladder for a rotary actuator having a substantially cylindrical inflatable body portion with an open mouth and a radially extending annular mounting flange and an end portion having a closed rounded end, said end portion in its uninflated state being preformed so that its axis extends at substantially an obtuse angle with respect to the longitudinal axis of said body portion so that the outside walls on the opposite sides of said end portion are concave and convex respectively, the wall thickness of the cylindrical body portion being substantially uniform along its entire length, the wall thickness of the convex side wall being less tha that of the concave side wall, the wall thickness being maximum at a point approximately mid-way of the length of the end portion on the concave side and progressively decreasing circumferentially along each side of the midway point to a point approximately midway of the length of the end portion on the convex side, whereupon when said bladder is pressurized the thinner wall will stretch at a faster rate than the thicker wall so that the closed end of the bladder will tend to move in an arcuate path.
Claim 6
Dependent Claim
201 words
As an article of manufacture an inflatable bladder for a rotary actuator having a substantially cylindrical inflatable body portion with an open mouth and a radially extending annular mounting flange and an end portion having a closed rounded end, said end portion in its uninflated state being preformed so that its axis extends at substantially an obtuse angle with respect to the longitudinal axis of said body portion so that the outside walls on the opposite sides of said end portion are concave and convex respectively, the wall thickness of the cylindrical body portion being substantially uniform along its entire length, the wall thickness of the convex side wall being less tha that of the concave side wall, the wall thickness being maximum at a point approximately mid-way of the length of the end portion on the concave side and progressively decreasing circumferentially along each side of the midway point to a point approximately midway of the length of the end portion on the convex side, whereupon when said bladder is pressurized the thinner wall will stretch at a faster rate than the thicker wall so that the closed end of the bladder will tend to move in an arcuate path.
References Cited (Backward Citations)
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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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |