Work holders – Plural holders to hold workpieces relative to each other – Workpieces normal to each other
Patent
1992-06-08
1993-11-02
Watson, Robert C.
Work holders
Plural holders to hold workpieces relative to each other
Workpieces normal to each other
269287, 269289R, 269102, 269904, B25B 500
Patent
active
052577759
ABSTRACT:
Jigs comprising rectangular plates (30, 50, and 60) have centrally positioned concentric recesses and/or holes (37, 39, 51, 53, 61, and 62) for accepting the lip (40) of recessed light fixtures, ceiling fans, and heaters during installation between adjacent ceiling joists. Jigs are attached to joists by screws passing through slots (33 and 65) which enable jigs to be adjusted side-to-side for exact position. Jigs have graduated scale (41) along edges for visual reference and correct positioning of fixture and centrally aligned slots (47) for attaching tape ruler when measuring to another fixture position. A rabbet (45) along one end allows jigs to be used as right-angle square for scribing adjacent joist. A handle (42) provides a balanced position for holding jig while attaching to joists. The jigs make it possible to wire multiple fixtures before installation. A fourth embodiment jig is spaced 0.5" below joists by spacers (72) and has concentric markings and parallel lines for positioning fixtures thereon. Jig has four dogs in radial slots for anchoring fixtures while hanger bars are permanently attached.
REFERENCES:
patent: 3116563 (1964-01-01), Gelbman
patent: 3163909 (1965-01-01), Williams
patent: 4261544 (1981-04-01), Addison
patent: 4589211 (1986-05-01), Policka
patent: 4793069 (1988-12-01), McDowell
patent: 4991807 (1991-02-01), Radnich
patent: 5031886 (1991-07-01), Sosebee
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