Balance spring lock for tilt out sash

Details Balance spring lock for tilt out sash Balance spring lock for tilt out sash

1976-08-26

1978-03-21

Kannan, Philip C.

Movable or removable closures

Mounted for optional movements

Pivot mounted on sliding member; e.g., slide-stile

49446, 49453, E05D 1522

Patent

active

040795497

ABSTRACT:
This invention relates to a balance spring lock for tilt out windows in which the balance spring is positioned in the jamb channel and connected through a sash cord to a block member and to the frame. The sash cord is directed over a sheave and either through an aperture in the block or guided along the surface of the block to be clamped against the block or within the block upon rotation of a shaft member therein coupled through a pin to the sash. The clamping action takes place through an eccentric surface on the shaft member through a cam follower operated by the shaft member, or through a pivoted lever attached to the shaft member. All variations of the clamping action operate with rotation of the shaft member caused by tilt of the window.

REFERENCES:
patent: 3055062 (1962-09-01), Peters et al.
patent: 3676956 (1972-07-01), Taylor et al.
patent: 3789549 (1974-02-01), Yip
patent: 3797168 (1974-03-01), Trout
patent: 3978617 (1976-09-01), Eventoff

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