Patent US3818874A successfully refreshed from Google Patents.
US3818874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety switch assembly for a relief valve
Assignee: Individual
•
Filing: 1973-04-02
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Granted: 1974-06-25
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Expires: 1993-04-02
Abstract
Abstract The within device is concerned with a safety switch for a relief valve which is comprised of mechanical and electrical components. The purpose of the switch is to turn off a boiler when a relief valve fails to function. The relief valve permits excessive steam to be released from the boiler and prevents explosion of the boiler. The within device has a lever arm mounted on a fulcrum. There is a cup at one end of the lever arm. The cup is mounted beneath a pipe which is connected to the relief valve. There is above the lever arm a normally open switch connected to a circuit that controls the flow of a water supply. There is connected below the lever arm another switch which is connected to the energy source that controls the operation of the boiler. When the cup fills up with water from the pipe connected to the deflective relief valve, the weight of the cup will cause the lever arm to tilt on its fulcrum. A normally open switch above the lever arm will be closed by the lever arm to turn off the water supply. The normally closed switch beneath the lever arm will open because of the pressure of the lever arm caused by the water in the cup and the electrical source that operates the controls of the gas or oil burner will be turned off since the circuit will be opened and the source of fuel to the burner will cease to burn.
Inventors
- 👤 P Tria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:33
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/44; F22B37/446; F22B37/443; Y; Y10; Y10T; Y10T137/00; Y10T137/5762; Y10T137/7722; Y10T137/7723
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
236 words
A safety switch assembly for protecting a boiler having a relief valve and an energizing unit to heat said boiler and a circuit for operating the flow of water from a source of water to the boiler, said circuit having a valve therein when the relief valve of the boiler malfunctions comprising a pipe connected to the relief valve, a lever arm mounted on a fulcrum, means at one end of the lever arm for collecting water from the said pipe a normally open switch, means connected at the top of the lever arm for operating a normally open switch, said normally open switch connected in a circuit for operating the flow of water to the boiler, means connected at the bottom of said lever arm for operating a normally closed switch, said normally closed switch connected to a circuit for operating the flow of electricity to the boiler energizing unit whereby when said lever arm is pushed downwardly on the fulcrum from the weight of the water that has collected in said means at the end of the lever arm, the normally open switch will close and the circuit in which it is connected will energize said valve and close off the supply of water to the boiler, and whereby the normally closed switch will open and the electrical circuit to operate the energizing unit will cease functioning and the boiler will be turned off.
Claim 2
Dependent Claim
236 words
A safety switch assembly for protecting a boiler having a relief valve and an energizing unit to heat said boiler and a circuit for operating the flow of water from a source of water to the boiler, said circuit having a valve therein when the relief valve of the boiler malfunctions comprising a pipe connected to the relief valve, a lever arm mounted on a fulcrum, means at one end of the lever arm for collecting water from the said pipe a normally open switch, means connected at the top of the lever arm for operating a normally open switch, said normally open switch connected in a circuit for operating the flow of water to the boiler, means connected at the bottom of said lever arm for operating a normally closed switch, said normally closed switch connected to a circuit for operating the flow of electricity to the boiler energizing unit whereby when said lever arm is pushed downwardly on the fulcrum from the weight of the water that has collected in said means at the end of the lever arm, the normally open switch will close and the circuit in which it is connected will energize said valve and close off the supply of water to the boiler, and whereby the normally closed switch will open and the electrical circuit to operate the energizing unit will cease functioning and the boiler will be turned off.
Claim 3
Dependent Claim
114 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 1 wherein the circuit of said normally open switch comprises a transformer having a primary and a low voltage secondary, said primary connected to a conventional electrical source, one side of said secondary connected in series with one side of said switch, an electrical solonoid adapted to operate a shut-off valve, said valve for controlling the flow of water from the water supply, the other side of said secondary of transformer connected to one side of said solonoid, the other side of said solonoid connected to the other side of said normally open switch.
Claim 4
Dependent Claim
77 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 1 wherein the circuit of the normally closed switch comprises a pair of conductors, one conductor of which is connected to one side of said normally closed switch and to one side of the enerGizing unit, and the other conductor being connected to the other side of said normally closed switch and to the source of electricity.
Claim 5
Dependent Claim
77 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 2 wherein the circuit of the normally closed switch comprises a pair of conductors, one conductor of which is connected to one side of said normally closed switch and to one side of the energizing unit, and the other conductor being connected to the other side of said normally closed switch and to the source of electricity.
Claim 6
Dependent Claim
50 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 1 wherein the means for collecting the water comprises a cup-shaped end of the fulcrum, mounted within a dust-free chamber and located beneath a pipe connected to the relief valve.
Claim 7
Dependent Claim
50 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 2 wherein the means for collecting the water comprises a cup-shaped end of the fulcrum, mounted within a dust-free chamber and located beneath a pipe connected to the relief valve.
Claim 8
Dependent Claim
50 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 3 wherein the means for collecting the water comprises a cup-shaped end of the fulcrum, mounted within a dust-free chamber and located beneath a pipe connected to the relief valve.
Claim 9
Dependent Claim
50 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 4 wherein the means for collecting the water comprises a cup-shaped end of the fulcrum, mounted within a dust-free chamber and located beneath a pipe connected to the relief valve.
Claim 10
Dependent Claim
72 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 5, said dust-free chamber having an opening only large enough to permit the lever arm to move up and down a sufficient distance to operate the normally open and closed switches, ahd having a pipe run-off means to permit an overflow of water to escape so as not to injure the device.
Claim 11
Dependent Claim
72 words
A safety switch assembly for protecting a boiler when the relief valve of the boiler malfunctions as described in claim 8, said dust-free chamber having an opening only large enough to permit the lever arm to move up and down a sufficient distance to operate the normally open and closed switches, and having a pipe run-off means to permit an overflow of water to escape so as not to injure the device.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |