Anti-snap device for drafting board tilting mechanism

Details Anti-snap device for drafting board tilting mechanism Anti-snap device for drafting board tilting mechanism

1982-04-05

1984-03-06

McCall, James T.

Horizontally supported planar surfaces

Tiltable surfaces

About plural axes

108 6, 108136, 267 73, A47F 512, A47B 902

Patent

active

044347219

ABSTRACT:
A drafting table having spring-balanced lifting and tilting movement features is provided with an anti-snap device which prevents the table top from tilting so quickly to the full-vertical position that it hits its stops and rocks the entire table over. The anti-snap device comprises a flexible strap which is wrapped about and fixed to cylindric members on which the table top lifts and tilts. The flexible strap becomes tight as the table top reaches its fully vertical position, but tightening of the strap is resisted by the tilt springs, which are pulled to one side by the strap. Resistance to the tightening of the strap requires more force to tilt the top to its full vertical position, increasingly slowing the tilting movement near the end of tilting travel.

REFERENCES:
patent: 2988843 (1961-06-01), Knudsen
patent: 3267878 (1966-08-01), Faux et al.
patent: 3359927 (1967-12-01), Janus
patent: 3903812 (1975-09-01), Cowley
patent: 3908560 (1975-09-01), Horner

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