Frictional sash balance and jamb liner

Means for positionally supporting a vertically slidable window sash, said means being adapted to be mounted along the vertical side of said window, said means including an elongated track along which the edge portion of said sash is slidable, said track having a pair of walls defining a channel therebetween, a sash-positioning shoe disposed at least partially within said channel, and a generally rigid sash support secured to said shoe, said sash support having a first portion which extends generally parallel to said elongated track and having a second portion which extends angularly away from said first portion and into engagement with said sash, said sash support comprising an integral shoe-rocking means for rocking said shoe into increasing frictional engagement with the walls of said channel in response to the particular weight of a sash acting on said rocking means to thereby resist movement of said sash along said track and at least partially support said sash in various selected vertical positions along said track.

In an apparatus for balancing a vertically movable window sash slidably mounted between a pair of vertical guides having wall portions forming mutually spaced friction braking surfaces extending vertically with said guides, wherein a frictional braking shoe is disposed between said braking surfaces and has a cross-sectional shape and size to be closely but slidably received therebetween and a tension spring extends along said guide and has an upper end secured with respect to said guide and a lower end secured to said shoe, the improvement comprising:

• a sash support member comprising a rigid one-piece unitary lever element having a pair of spaced end portions, one of said end portions extending toward said shoe for securement thereto and the other of said end portions projecting toward said sash to seat under at least portions thereof and support the sash upon said spring, said sash support member and said shoe being configured for mutual engagement such that the weight of said sash acting on said other end portion of said sash support member causes said sash support member to act as a unitary lever which rotatably moves said shoe against at least certain of said braking surfaces and applies pressure thereto for frictionally holding said sash in a plurality of different vertical positions along said guides.

Means for balancing a vertically movable window sash slidably mounted between a pair of vertical guides, each such guide having projecting wall portions forming a pair of oppositely disposed, mutually spaced ribs providing friction braking surfaces which extend vertically with said guides, a frictional braking shoe having portions extending between said spaced ribs and having at least two sets of mutually spaced braking elements, each adapted to slidably receive a different one of said ribs therebetween, a tension spring having an upper end secured with respect to said guide and a lower end secured to said shoe, and a sash support member having first portions extending toward and secured to said shoe and second portions projecting toward and engaging said sash to couple the sash to said spring for support thereupon, said sash support member being configured and secured to said shoe such that the weight of said sash acting on said other arm portion of said sash support member acts through said sash support member to move said braking elements of said shoe against said braking surfaces with sufficient pressure to frictionally hold said sash in position in a plurality of different vertical positions along said guides against the operative influence of the spring at any such different vertical positions.

Means for positionally supporting a vertically slidable window sash, said means being adapted to be mounted along the vertical side of said window, said means including an elongated track along which the edge portion of said sash is slidable, said track having walls defining a channel including a pair of mutually spaced front walls defining a slot therebetween and a rear wall, said front and rear walls defining at least a pair of spaced frictional braking surfaces or at least one side thereof, a sash-positioning shoe disposed at least partially between said front and rear walls, and a sash support secured to said shoe and having portion which extends generally away from said shoe and into engagement with said sash, said sash support comprising means for rocking said shoe into increasing frictional engagement with at least a selected pair of said frictional braking surfaces in response to the weight of a sash acting on said sash support to thereby resist movement of said sash along said track and at least partially support said sash in various selected vertical positions along said track.