Fluid handling – Hydrant type – With casing
Patent
1982-02-12
1983-06-28
Walton, George L.
Fluid handling
Hydrant type
With casing
70276, 81 53R, 81 90C, 137382, 1373848, 192 84PM, 251 65, 251 89, 251291, 403DIG1, F16K 3506, F16K 3516, F16K 3108
Patent
active
043900380
ABSTRACT:
A magnetically locked fluid valve having a particular utility in a fire hydrant to prevent unauthorized usage thereof. The fire hydrant includes an operating nut mounted on top of one end of a hydrant actuator shaft, and a magnetic lock is located in immediate proximity thereto. A shaped magnet is adapted to be placed around the actuator shaft adjacent to the magnetic lock, after which a wrench can be applied to the operating nut to control operation of the fire hydrant. The magnetic lock includes magnetic tumblers which are shifted in position in response to placement of the magnet on the actuator shaft. The actuator shaft includes an upper section coupled to the operating nut and a lower section coupled to the hydrant valve. The magnetic lock is positioned between the upper and lower shaft sections, and the upper shaft section is freely rotatable relative to the lower section when the magnet is removed, but is locked relative thereto when the magnet is positioned thereon.
REFERENCES:
patent: 1553953 (1925-09-01), O'Brien
patent: 2289574 (1942-07-01), Carlson
patent: 3453897 (1969-07-01), Adinolfi
patent: 3840041 (1974-10-01), McMurray
patent: 3916939 (1975-11-01), Gillard
patent: 3939861 (1976-02-01), Thompson
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