Abstract: An elongated cover is removably mounted to a channel guide of a jamb liner for a window unit that is mounted for movement between opened and closed positions. A balance spring in the channel guide has one portion attached to the top end of the jamb liner and an opposite end mounted to a balance shoe which frictionally engages the channel guide. The shoe is mounted to the lower end portion of the window unit. The cover includes a longitudinally elongated main body extendable within the channel guide, a resilient tube mounted to one transverse edge of the main body to abut against a channel guide side wall and rear wall to resiliently urge the main body away therefrom and a mounting joined to the main body transversely opposite the tube for forming a channel to engage a flange of the channel guide. The resilient action of the tube releaseably couples the cover to the channel guide to conceal the spring which extends above the window unit when the unit is closed or partially opened.

Abstract: A jamb liner is mounted in the side jamb tracks of a window frame to mount window units of double hung windows for slidable movement between opened and closed positions. The liner includes transversely spaced channel guides, each guide mounting a guide member that is attached to the adjacent window unit. Flanges are joined to the guides for forming a close fit with the adjacent window unit while, to each guide, there is joined a wing to form a seal with the web of the adjacent jamb to block fluid flow between the window units and the side jamb from one transverse side of the unit sash to the other. The wings of the liner are arcuately curved to transversely diverge from one another in a direction toward the jamb web. The wings are of a substantially greater resiliency than the rest of the liner, said rest of the liner being semi-rigid and made of extruded plastic.

Abstract: A channel-shaped bracket of polyvinyl chloride having leg portions possessing a durometer value on the order of Shore D90 and hook portions integral with the free edges of the leg portions that have a durometer value on the order of Shore A70 is disclosed. The relatively soft and more flexible hook portions releasably engage ridge hooks extending in a recessed relation along the marginal edges of a jamb liner, the jamb liner also being of polyvinyl chloride with a durometer value on the order of Shore D90. The hook portions, being softer and more flexible than the ridge hooks as indicated above, readily release the jamb liner when a sufficient pull is applied so that the liner can be easily removed from the wooden jamb to which it is attached. The web of the bracket is sufficiently thin such that the bracket can be stapled to the wooden jamb.