US3749865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature responsive control switch with bi-metallic disk means
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1971-12-21
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Granted: 1973-07-31
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Expires: 1991-12-21
Abstract
Abstract A temperature-compensated gas density relay includes a bellows unit subjected to the gas, the pressure from which is transmitted by the bellows unit through a support mounting a bi-metallic disc and a shaft carried by the central portion of the bi-metallic, and longitudinal displacement of the shaft in response to the change in gas pressure serves to actuate the contacts of an electrical switch component of the relay. Should there be a change in the gas temperature, compensation therefor is accomplished by a temperature-induced displacement of the central portion of the bi-metallic disc, and hence also the shaft, in a direction opposite to that caused by the change in the gas pressure resulting from that same change in temperature.
Inventors
- 👤 U Kalt
- 👤 R Kung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:05
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
In a temperature-compensated gas density relay the combination comprising a bellows unit subjectable to a pressurized gas to be supervised, one end of said bellows unit being fixed in position and the other end which is movable in response to a change in gas pressure being secured to a support member to effect a corresponding movement thereof in a direction longitudinally of the bellows unit, a temperature-compensating bi-metallic disc subjectable to the temperature of the gas and having only the peripheral portion thereof secured to said support member for movement therewith, and a relay operating shaft secured to the central portion of said bi-metallic disc which is moved in one direction to actuate a relay member such as the contacts of an electrical switch in response to movement of said bellows unit effected by an increase in gas pressure, said central portion of said bi-metallic disc being spaced from said support member and said central portion together with said relay operating shaft secured thereto being movable in the opposite direction upon an increase in gas temperature thereby to compensate for an increase in gas pressure resulting solely from an increase in its temperature.
Claim 2
Dependent Claim
193 words
In a temperature-compensated gas density relay the combination comprising a bellows unit subjectable to a pressurized gas to be supervised, one end of said bellows unit being fixed in position and the other end which is movable in response to a change in gas pressure being secured to a support member to effect a corresponding movement thereof in a direction longitudinally of the bellows unit, a temperature-compensating bi-metallic disc subjectable to the temperature of the gas and having only the peripheral portion thereof secured to said support member for movement therewith, and a relay operating shaft secured to the central portion of said bi-metallic disc which is moved in one direction to actuate a relay member such as the contacts of an electrical switch in response to movement of said bellows unit effected by an increase in gas pressure, said central portion of said bi-metallic disc being spaced from said support member and said central portion together with said relay operating shaft secured thereto being movable in the opposite direction upon an increase in gas temperature thereby to compensate for an increase in gas pressure resulting solely from an increase in its temperature.
Claim 3
Dependent Claim
78 words
A temperature compensated gas density relay as defined in claim 5 wherein said support member includes a head portion to which the periphery of said bimetallic disc is secured and a hollow stem portion into which a portion of said shaft extends and is guided as said shaft is displaced, said stem portion extending into and being secured to one end of said bellows unit, the opposite end of said bellows unit being secured in a fixed position.
Claim 4
Dependent Claim
50 words
A temperature compensated gas density relay as defined in claim 2 wherein said bellows unit is located within and secured to one end of a nipple and the end wall of said nipple includes an opening through which said stem portion of said support member extends into said bellows unit.
Claim 5
Dependent Claim
63 words
A temperature compensated gas density relay as defined in claim 2 wherein said shaft extends through said bi-metallic disc and includes an intermediate collar secured to the central portion thereof, the part of said shaft below said collar extending within the hollow stem portion of said support member and the part of said shaft above said collar serving to actuate said relay member.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |