US3691499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuating device employing a heat expansible wire
Assignee: Robertshaw Controls Co
•
Filing: 1971-09-10
•
Granted: 1972-09-12
•
Expires: 1991-09-10
Abstract
Abstract The present actuator employs a heat expansible element and is of the type actuator known as a ''''hot-wire'''' actuator. The present actuator has an extremely simplified structure formed by two substantially J-shaped frame members, the arms of which are interconnected by insulating members; a thermally expansible element extending between the base portions of the frame members, which base portions also have depending legs serving both as terminals and supports for the frame; and linkage means responsive to the tension of the element as it expands and contracts to produce movement useful for actuating switches, valves, etc.
Inventors
- 👤 Hugh J Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:49
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/46; H01H37/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A thermal responsive actuator comprising a casing, a frame comprising two substantially identical frame elements mounted in said casing, each said frame element having a generally J-shaped configuration formed by a long arm and a short arm extending from a base portion and a terminal portion extending from said base portion normal to the plane of said arms, insulating means connecting said arm portions of one of said frame elements to said arm portions of the other of said elements, thermally expansive wire means connected between said base portions of said frame elements, and means connected to said wire means to be responsive to the movement thereof and to effect a useful movement.
Claim 2
Dependent Claim
113 words
A thermal responsive actuator comprising a casing, a frame comprising two substantially identical frame elements mounted in said casing, each said frame element having a generally J-shaped configuration formed by a long arm and a short arm extending from a base portion and a terminal portion extending from said base portion normal to the plane of said arms, insulating means connecting said arm portions of one of said frame elements to said arm portions of the other of said elements, thermally expansive wire means connected between said base portions of said frame elements, and means connected to said wire means to be responsive to the movement thereof and to effect a useful movement.
Claim 3
Dependent Claim
68 words
A thermal responsive actuator according to claim 1 wherein said means connected to said wire means comprises, lever means having one end pivotally mounted on the exterior of said casing, spring means biasing the other end of said lever means away from said casing, and link means passing through said casing with one end attached to said wire means and the other end attached to said lever means.
Claim 4
Dependent Claim
30 words
A thermal responsive actuator according to claim 1 wherein said frame is mounted with said terminal portions projecting out of said casing thereby forming electrical connection terminals for the actuator.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |