Supports – Brackets – Adjustable
Patent
1988-08-04
1989-07-11
Foss, J. Franklin
Supports
Brackets
Adjustable
2482811, 248586, E04G 300
Patent
active
048464341
ABSTRACT:
A spring counterbalanced arm assembly including a base member, a lower arm, an upper arm, a knee bearing member and object supporting means. The lower arm has an elongated, generally tubular member defining an elongated cavity therein. The base end of the tubular member includes means defining a forwardly extending bracket and has pivot means thereon positioned forwardly of an exterior front wall of the tubular member for pivotally connecting the base end bracket of the lower arm to the base member at a first pivot axis of the base member. The knee end of the tubular member includes a forwardly extending bracket having pivot means thereon positioned forwardly of the exterior front wall for pivotally connecting the knee end of the lower arm to a knee end of an upper arm and to the knee bearing member at a first pivot axis of the knee bearing member. The lower arm includes a slider and tension spring enclosed within it to provide counterbalancing force. The lower arm assembly also includes an elongated stay arm substantially completely enclosed within the elongated cavity of the lower arm. The stay arm is pivotally connected to the knee bearing member and to the base member so as to form a parallelogram mechanism. The counterbalanced arm assembly also includes an upper arm assembly having a generally tubular member defining an elongated cavity therein, and an extensible tension spring and slider for providing counterbalancing force by means of linkage means between the knee bearing member and the slider.
REFERENCES:
patent: 2787434 (1957-04-01), Jacobsen
patent: 3041060 (1962-06-01), Jacobsen
patent: 3226073 (1965-12-01), Jacobsen
patent: 3543019 (1970-11-01), Jacobsen
patent: 3774873 (1973-11-01), Krogsrud
patent: 4080530 (1978-03-01), Krogsrud
patent: 4160536 (1979-07-01), Krogsrud
patent: 4447031 (1984-05-01), Souder et al.
patent: 4494177 (1985-01-01), Matthews
patent: 4770384 (1988-09-01), Kuinazima et al.
Foss J. Franklin
Jac Jacobsen Industrier A.S.
Razzano Pasquale A.
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