US3749307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bifunctional thermostat device for a heating type refrigerator having both an electric heater and a gas heater
Assignee: Saginomiya Seisakusho Inc
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Filing: 1971-12-06
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Granted: 1973-07-31
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Expires: 1991-12-06
Abstract
Abstract A bifunctional thermostat device for a heating type refrigerator having both an electric heater and a gas heater comprises a bellows whose internal pressure is controlled by a temperature sensitive member connected by a capillary tube to the bellows. A pivoted L-shaped lever has a first leg engageable with the movable outer end of the bellows and a second leg connected to operate a normally closed snap action switch controlling energization of an electric heater. The lever is biased in one direction by a spring connected to a cam follower having an end projecting outwardly and into engagement with a temperature setting cam. A diaphragm type valve controls the supply of gas to the gas heater and the diaphragm is spring biased to an open position. A pin secured to the diaphragm engages a lever assembly pivoted intermediate its ends, and a rigid rod is engaged between a free end of the lever assembly and the first arm of the Lshaped lever. When the internal pressure of the bellows decreases, due to a decrease in the refrigeration temperature, the L-shaped lever pivots to snap open the switch and to rotate the lever assembly to cause the pin to move the diaphragm toward a valve closing position.
Inventors
- 👤 T Odashima
- 👤 T Makita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:06
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0208; F; F25; F25B; F25B33/00; F25B49/00; F25B49/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
A bifunctional thermostat device for a heating type refrigerator having both an electric heater and a gas heater which comprises a pressure member actuated responsive to temperature change of a temperature sensitive member; an L-shaped actuating lever which is pivotable at its angular portion and is at its one leg portion in contact with said pressure member; a quick-action snap switch means connected to the other leg portion of said L-shaped actuating lever through the medium of a connecting rod; a cam member for setting a refrigerating temperature; a cam follower which is at its one end in contact with said cam member and is pivotally secured at the other end thereof; a tension spring provided between said other leg portion of the L-shaped actuating lever and said cam follower; a valve including a valve casing and a valve body which are, when the refigerating temperature is higher than the preset temperature, in the open relationship by the action of a compression spring provided therebetween; and a valve actuating means connected to said one leg portion of the L-shaped actuating lever and adapted to actuate said valve body against said compression spring.
Claim 2
Dependent Claim
192 words
A bifunctional thermostat device for a heating type refrigerator having both an electric heater and a gas heater which comprises a pressure member actuated responsive to temperature change of a temperature sensitive member; an L-shaped actuating lever which is pivotable at its angular portion and is at its one leg portion in contact with said pressure member; a quick-action snap switch means connected to the other leg portion of said L-shaped actuating lever through the medium of a connecting rod; a cam member for setting a refrigerating temperature; a cam follower which is at its one end in contact with said cam member and is pivotally secured at the other end thereof; a tension spring provided between said other leg portion of the L-shaped actuating lever and said cam follower; a valve including a valve casing and a valve body which are, when the refigerating temperature is higher than the preset temperature, in the open relationship by the action of a compression spring provided therebetween; and a valve actuating means connected to said one leg portion of the L-shaped actuating lever and adapted to actuate said valve body against said compression spring.
Claim 3
Dependent Claim
70 words
A bifunctional thermostat device as claimed in claim 1, wherein said valve actuating means comprises a pin which is at its top end in contact with said valve body and resets on a supporting lever means pivotally secured; and a rod which is at its top end in contact with said one leg portion of the L-shaped actuating lever and at its lower end supported by said supporting lever means.
Claim 4
Dependent Claim
16 words
A bifunctional thermostat device as claimed in claim 1, wherein said valve body is a diaphragm.
Claim 5
Dependent Claim
45 words
A bifunctional thermostat device as claimed in claim 2, wherein said supporting lever means comprises an upper plate and a lower plate; the gap between said upper plate and said lower plate being regulated by means of a screw member screwed in said lower plate.
Claim 6
Dependent Claim
41 words
A bifunctional thermostat device as claimed in claim 1, wherein said tension spring has at its end adjacent said cam follower a nut inserted therein; and a screw screwed into said nut, thereby to regulate the action of said tension spring.
Claim 7
Dependent Claim
77 words
A bifunctional thermostat device as claimed in claim 1, wherein said quick-action snap switch means has a movable plate contact having one end connected to an electric terminal; a fixed contact connected to another electric terminal and adapted to be connected to and disconnected from the other end of said movable plate contact; and a means to regulate the distance between said other end of the movable plate contact and said fixed contact at their disconnected position.
References Cited (Backward Citations)
US2422482A
Cited
US2463712A
Cited
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 |