Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1988-10-19
1990-04-24
Moon, Charlie T.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29558, 209397, 210498, B23P 1516
Patent
active
049188070
ABSTRACT:
A plurality of blind openings (e.g. holes or slots) are formed through a first face of a steel plate and extend a predetermined distance short of the opposite face. Larger size openings are formed through the first face using the blind openings as pilot openings. The larger size openings extend into the plate short of the terminations of the blind openings. Metal is machined from the opposite face in parallel rows defining grooves and to a depth to uncover the terminations of the blind openings in the plate body thereby providing through-extending screen openings in the plate. The ridges (bars) between the grooves may be quadrate in cross-section, or a side face sloped (angled) by machining. A screen cylinder with bars of the invention has a maximum screen area (compared to prior art screens with bars).
REFERENCES:
patent: 2134146 (1938-10-01), Raisch
patent: 2185999 (1940-01-01), Johnson
patent: 2792122 (1957-05-01), Munch et al.
patent: 4259136 (1981-03-01), Spiewok
patent: 4276159 (1981-06-01), Lehman
patent: 4358370 (1982-11-01), Jameson et al.
patent: 4473466 (1984-09-01), Schmidt et al.
patent: 4486934 (1984-12-01), Reed
patent: 4529520 (1985-07-01), Lampenius
patent: 4571298 (1986-02-01), Holz
A. Ahlstrom Corporation
Moon Charlie T.
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