Movable or removable closures – With means mounting closure for reciprocation
Patent
1991-07-02
1992-07-21
Kannan, Philip C.
Movable or removable closures
With means mounting closure for reciprocation
16 72, E05D 1506
Patent
active
051311887
ABSTRACT:
The invention described is a device or apparatus for automatically returning a sliding door or window to a predetermined position within a stationary frame, which incorporates a cable anchor on the frame; a hollow housing on the sliding closure having axially aligned elongated compartments in the housing, the more distant of which from the anchor is fluid-tight; a traveling block axially movably disposed in the closer compartment; a cable from the anchor reeved through sheaves in the traveling block; a tensioner connecting the traveling block with a partition between the compartments and biasing the traveling block away from the anchor to prevent shock in the system when slack is introduced into the cable by manual movement of the closure; the more distant compartment being divided into two fluid-tight chambers communicating at their adjacent ends; a rod longitudinally movably disposed through the traveling block and one chamber; a resilient compression device biasing the rod and the traveling block away from the anchor; a movable valve mounted on the rod to regulate fluid flow between the opposite ends of the chamber, the valve blocking or restricting longitudinal fluid flow within the chamber when the closure moves from the predetermined position and permitting flow when the closure moves toward the predetermined position; and the valve and fluid communication conduits cooperating to control the speed of movement of the rod urged by biasing of the compression device; whereby the closure is returned to the predetermined position at a preselected speed and without shock.
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Hutchison Davie G.
Prochaska David M.
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