Counterbalanced arm for a lighthead

Details Counterbalanced arm for a lighthead Counterbalanced arm for a lighthead

1990-03-16

1991-06-18

Lazarus, Ira S.

Illumination

Supports

Counterbalanced support

362288, 362427, 2482951, 248325, F21V 2115

Patent

active

050253590

ABSTRACT:
A counterbalanced arm for a lighthead has an upper arm portion, a lower arm portion adapted at one end to be connected to the lighthead and at the other end for articulation about the upper arm portion, and a pivot assembly connecting the upper arm portion to the lower arm portion. The pivot assembly defines a pivot axis about which the lower arm portion pivots with respect to the upper arm portion. A lever mechanism is positioned so that a first end is positioned on one side of the pivot axis and a second end is positioned on the opposite side of the pivot axis, with the first end being pivotally secured to either the upper arm portion or the lower arm portion. A pull rod is positioned within either the upper arm portion or the lower arm portion and is pivotally attached to the second end of lever mechanism. The pivot assembly and lever mechanism are designed to enable the lower arm portion to pivot about the pivot axis from a position forming an acute angle with respect to the upper arm portion through a position forming a 180 degree angle with upper arm portion. A spring is operatively connected to the pull rod so that the spring provides a force to counterbalance the lighthead.

REFERENCES:
patent: 2911519 (1956-09-01), Phillips et al.
patent: 3010013 (1958-04-01), Gunther et al.
patent: 3240925 (1962-12-01), Paschke et al.
patent: 3360640 (1965-04-01), Seitz et al.
patent: 3936671 (1976-02-01), Bobrick et al.
patent: 4032775 (1977-06-01), Bobrick et al.
patent: 4080530 (1978-03-01), Krogsrud
patent: 4097919 (1978-06-01), Bobrick et al.
patent: 4130858 (1978-12-01), Hayakawa
patent: 4494177 (1985-01-01), Matthews
patent: 4517632 (1985-05-01), Roos
patent: 4744019 (1988-05-01), Krogsrud
patent: 4770384 (1988-09-01), Kuwazima et al.

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