Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1994-11-23
1996-09-10
Vo, Peter
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29278, 29764, 81 5311, 81 5312, B23P 1904
Patent
active
055533736
ABSTRACT:
A maintenance device for the servicing of overhead modular photoelectric control switches, from ground level. This invention integrates the means to functionally test, remove, and install photoelectric control switch modules, normally associated with outdoor lighting. Alternatively, the device can remove and install high intensity light bulbs. The device comprises a pair of rotatable contracting grips, at one end. The grips respond to rotation of a cam, which also attaches the opposite end of the grips to a flex-head ratchet wrench. The wrench selectively imparts either clockwise or counterclockwise drive to the cam and, therefore, the grips. The opposite, or handle, end of the ratchet wrench is in sequence connected, via a universal attaching head, to a telescopic pole. When the grips are slided over a modular photoelectric control switch, the amount light striking its sensor is reduced, causing a functional module to switch on. If it fails to switch on, the module has malfunctioned and must be replaced. Removal is accomplished by short alternating lateral movement of the telescopic pole, causing the attached ratchet wrench to impart rotation of the cam and grips. Rotation frees the gripped module from its receptical and it is lowered to ground, using the telescopic pole, and manually removed from the grips. Installation is the reverse operation of removal.
REFERENCES:
patent: 558573 (1896-04-01), Smith
patent: 1258430 (1918-03-01), Morris
patent: 1655979 (1928-01-01), Watkins
patent: 2516650 (1950-07-01), Shapiro et al.
patent: 2573002 (1951-10-01), Foster
patent: 2634999 (1953-04-01), Fjeld
patent: 5317939 (1994-06-01), Marinesa
patent: 5322334 (1994-06-01), Hammer
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