Caldwell Manufacturing Company

Brian S Dense

Norman R Westfall

Patrick E Milligan

William P Newton

John I Habbersett

John R Yonovich

A top clip (20) automatically anchors a window spring (15) at the upper end of a jamb liner spring cover (11) having a generally D-shaped cross section. The top clip has a body (21) that interlocks with the upper coils of spring (15) and has a rounded nose (26) that helps guide the body inside the upper end of spring cover (11). The top of body (21) has a flange (22) that overlaps the upper end of the spring cover, and the periphery of the flange has retainer tangs (25) that extend downward to overlap the outer surface of the spring cover. If a spring is accidentally snapped during assembly, top clip (20) and spring (15) are free to move above the upper end of spring cover (11) and can be returned to an anchored position, simply by pulling downward on the spring and the top clip.

Automatic anchoring system for window spring

A block and tackle balance system (10), contained within a spring cover (12) extending for the full length of a jamb liner (11), includes a guide (30) that directs a cord (25) through an angled course as it passes from the balance (20), through a hole (13) in the spring cover, to a support that moves up and down with a sash (15) outside the spring cover. The passing of the cord through the angled course in the guide produces load-related friction that helps prevent hop and drop of the sash. Guide (30) also preferably supports an end of the balance within the spring cover, and a support (50, 60) on the free end of cord (25) preferably engages sash (15) automatically as the sash assembled between a pair of jamb liners (11).

Cord guide system for sash balance

Molded resin vibration dampener is mounted on coiled tension window balance springs arranged within spring covers. A resin wall of the vibration dampener, shaped for fitting around the tension spring, has a slot oriented longitudinally of the spring, and the wall is flexible enough to allow the slot to be spread open so that the body can be pressed onto a mid-region of the spring. Resilient fins extend obliquely outward from the body far enough to engage an interior surface of the spring cover and thereby hold the body and the spring spaced away from the spring cover to prevent rattling of the spring within the cover.

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Rochester, NY, United States of America

Brian S Dense