Controlled mounting for luminaire on tiltable drafting board

Details Controlled mounting for luminaire on tiltable drafting board Controlled mounting for luminaire on tiltable drafting board

1985-01-15

1986-05-06

Lyddane, William E.

Horizontally supported planar surfaces

With illumination means

108 7, A47B 8500

Patent

active

045864403

ABSTRACT:
An apparatus for counterbalancing a luminaire pivotally mounted on a drafting board which is adapted to be inclined to a selected working position from approximately 0 degrees to 90 degrees in which the luminaire is provided with support members pivotally mounted on the board and first and second friction control devices are cooperable with the pivotal mounting to provide necessary counterbalancing forces in selected positions of the luminaire. The second control device is activated by a gravity responsive latch when the board is inclined beyond a selected angle of inclination to augment the counterbalancing forces where the gravity moment arm of the luminaire enters a maximum range.

REFERENCES:
patent: 2131708 (1938-09-01), Lesperance
patent: 2864432 (1958-12-01), Limberg
patent: 2943897 (1960-07-01), Johnson et al.
patent: 3163939 (1965-01-01), Heyer
patent: 4165530 (1979-08-01), Sowden
patent: 4372631 (1983-02-01), Leon
patent: 4397245 (1983-08-01), Washburn

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