Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1995-05-15
1997-02-25
Watson, Robert C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
B23P 1904
Patent
active
056049676
ABSTRACT:
A dowel extraction device comprising: an inner cylinder formed in a generally cylindrical configuration with an upper surface and a lower surface, the lower surface including a bore extending therein, the bore including adjustable coupling devices to permit gripping of dowels having different diameters; a central shaft formed an elongated cylindrical configuration with a plurality of external screw threads, the shaft being fixedly attached to the upper surface of the inner cylinder, a nut having a threaded aperture adapted to be threadedly coupled to the central shaft; and an outer cylinder formed in a hollow generally cylindrical configuration with a closed upper end and an open lower end, the upper end including an aperture, the outer cylinder being positioned over the inner cylinder with the central shaft extending through the aperture, the nut being coupled to the shaft above the upper end of the outer cylinder, the apparatus adapted to grip and vertically remove a dowel by rotating the large nut thereby causing upward movement of the inner cylinder.
REFERENCES:
patent: 3972103 (1976-08-01), Kenyon
patent: 4059883 (1977-11-01), Osborne
patent: 4420864 (1983-12-01), Hoyt
patent: 4939831 (1990-07-01), Doninger
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