Fluid handling – With lock or seal – Locks against rotary motion
Patent
1991-11-04
1993-03-02
Chambers, A. Michael
Fluid handling
With lock or seal
Locks against rotary motion
137613, F16K 3500
Patent
active
051900700
ABSTRACT:
The present invention is a gas shut off valve (10) which can be locked without disassembly of the gas service. The preferred embodiment of this invention comprises a valve (10) having two chambers (26a, 26b). The first chamber (26b) is just like a standard gas valve, and has a handle (38) which can be turned with a standard tool, such as a commonly available wrench. This chamber (26b) is not lockable and is available for anyone to use for service modification or emergency shut off. The second chamber (26a) is identical in all respects to the first chamber with the exception of the shape of the handle (34). This second, "lockable" handle (34) is shaped like the plug (50) of plug lock assemblies manufactured by Inner-Tite Corporation. Because it has wrenching flats (45), the lockable handle (34) can also be turned with a wrench. In this way, the second chamber (26a) can be opened and closed. Furthermore, the outer body (12) of the plug lock assemblies manufactured by Inner-Tite Corporation can be locked in place over the handle (34) with the key (13) covered by U.S. Pat. Nos. 3,867,822 and 4,289,000. The key must be installed and removed using the special tools (68) covered by U.S. Pat. Nos. 3,867,822 and 4,289,000. Installation of the outer body (12) and key (13) will prevent unauthorized persons from tampering with the gas service. Using the improved shut off valve (10) of this invention, the gas utilities will be able accomplish positive, tamper proof locking of the gas shut off valve (10) without having to disassemble the service entrance.
REFERENCES:
patent: 475530 (1892-05-01), Zimmerman, Jr.
patent: 746500 (1903-12-01), Gummer
patent: 993372 (1911-05-01), Hipwell
patent: 1104022 (1914-07-01), Tuttle
patent: 1315054 (1919-09-01), Teisseire
patent: 3867822 (1975-02-01), Morse et al.
patent: 4289000 (1981-09-01), Nielsen, Jr.
Inner-Tite Product Data Sheet No. 2M487, 1990.
Chambers A. Michael
Townsley Norton R.
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