Mechanical linkage sash displacement device

Details Mechanical linkage sash displacement device Mechanical linkage sash displacement device

1994-09-12

1996-03-12

Dorner, Kenneth J.

Movable or removable closures

Handle or protector

E05B 100

Patent

active

054975794

ABSTRACT:
A sash is displaced manually by the exertion of force upon a frontal bar rigidly connected to the distal ends of a first pair of arms spaced apart from each other extending perpendicularly from opposed jambs pivoted at proximate ends. A second pair of arms, similarly spaced apart from each other, is pivoted to the sash at proximate ends above the first arm pivots to the jambs, the distal ends being pivoted to the first arms at a point medial the first arm ends. The length of each arm and the distance between congruent connections is equivalent and all six pivots enable rotation in planes perpendicular to the sash. The frontal bar, the first arms and the two pivots connecting congruent pairs of arms are displaced in an arc with respect to the sash and jambs and linear displacement of the sash by this linkage is effected with a basic mechanical advantage equal to the length of the first arm divided by the radius of the arc described by the either pivot between paired arms. The linear travel of the sash is related to the arcuate displacement of the frontal bar by the tangent of the second arm taken to the pivot arc which varies continuously. The total travel equals twice the pivot arc radius. The rate of sash travel as a function of arcuate displacement, the precise inverse of the overall mechanical advantage, is greatest when the pivot between arms is in the portion of the arc above perpendicular to the face of the closure. Conversely, the rate of travel is least and the mechanical advantage is greatest in the pivot arc lower portion proximate the jambs. The mechanical advantage provided by this linkage thus varies to provide the most advantage when it is most needed, initially from the closed position, and provides the greatest rate of sash travel where manual effort is most easily exerted. This linkage also provides automatic exterior locking of the sash in the closed position. Reach over a frontal barrier is also facilitated with an optional auxiliary bar offset from and parallel to the frontal bar and more further mechanical advantage is obtainable with an auxiliary arm connected by ratchet to one of the first arms.

REFERENCES:
patent: 965096 (1910-07-01), Fisher
patent: 1164340 (1915-12-01), Faulhaber
patent: 4516355 (1985-05-01), Basil

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