Vertical lift device

Details Vertical lift device Vertical lift device

1992-11-27

1994-10-04

Milano, Michael J.

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

49338, 49385, 49 27, E05F 1124

Patent

active

053514408

ABSTRACT:
Apparatus for controlled raising and lowering of a barrier about a pivot point in which optimum control forces are applied to the barrier throughout its range of operation, and in which sensors are provided to prevent movement of the barrier against a resistive force to thereby prevent damage to the barrier, its operative mechanism, or an external object in its path.

REFERENCES:
patent: 1269545 (1918-06-01), Mengedoht
patent: 2551239 (1951-05-01), Bond
patent: 3303303 (1967-02-01), Miller
patent: 3333362 (1967-08-01), Kostin et al.
patent: 4051746 (1977-10-01), Liljeros
patent: 4337670 (1982-07-01), Carlson
patent: 4429264 (1984-01-01), Richmond
patent: 4735018 (1988-04-01), Duncan et al.
patent: 4986031 (1991-01-01), Agnew et al.
patent: 5079417 (1992-01-01), Strand
patent: 5142822 (1992-09-01), Beckerman

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