Method of fabricating a hand calculator

Details Method of fabricating a hand calculator Method of fabricating a hand calculator

1982-06-07

1984-05-29

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

29446, 29458, 29521, 29526R, 72327, 72347, 156629, 235 74, 235 78R, 235 88R, 403162, 403274, 403376, 427421, B23P 1100

Patent

active

044506155

ABSTRACT:
A method of fabricating a hand calculator utilizing die press punching to form its three parts. A circular stationary base plate is punched with a central, circular, raised, beveled portion which is then rigidly fixed to a circular stationary top plate by means of flared eyelets. Between these two parts a circular movable scale plate is movably inserted. The scale is etched with scales, and punched with a plurality of holes about its periphery to allow for pencil point movement.

REFERENCES:
patent: 1285941 (1918-11-01), Church
patent: 1382331 (1921-06-01), Thomas
patent: 1433123 (1922-10-01), Corey
patent: 1900960 (1933-03-01), Takeda
patent: 2013640 (1935-09-01), Steinhart et al.
patent: 2103424 (1937-12-01), Lehman
patent: 3191564 (1965-06-01), Fraze
patent: 3277541 (1966-10-01), Wilton et al.
patent: 4092521 (1978-05-01), Weisshaar
patent: 4150472 (1979-04-01), Derain
patent: 4366696 (1983-01-01), Durgin et al.

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