Window balance having four-loop cord configuration
AssigneeAmesbury Group, Inc.
InventorWilbur J. Kellum, III
Life of this patent
Estimating the term…
Abstract
A window balance has a channel with two ends. A top guide is disposed at one end of the channel and a bottom guide is disposed at the other end of the channel. One end of a spring is fixed within the channel. A movable block is secured to the other end of the spring. Rollers are rotatably mounted in the movable block. A single roller is rotatably mounted to a fixed block which is secured to the channel. A cord exit roller is disposed proximate the bottom guide. The first end of a cord is fixed relative to the channel. The middle portion of the cord is routed about the rollers mounted in the movable block and mounted to the fixed block. A second end of the cord is routed around the cord exit roller and is attachable to a window jamb.
Claims19
A window balance comprising:
- a channel having a first channel end and a second channel end;
- a top guide disposed at the first channel end;
- a bottom guide disposed at the second channel end;
- a spring having a first spring end fixed within the channel and a second spring end;
- a movable block secured to the second spring end;
- a fixed block secured to the channel;
- a plurality of rollers rotatably mounted in the movable block;
- a single roller rotatably mounted in the fixed block;
- a cord exit roller disposed proximate the bottom guide;
- and
- a cord having a first cord end fixed relative to the channel, a middle cord portion routed about the plurality of rollers and the single roller, and a second cord end routed around the cord exit roller, wherein the second cord end is attachable to a window jamb.
A window balance comprising:
- a channel having a first channel end and a second channel end;
- a spring having a first spring end fixed relative to the channel and a second spring end;
- a movable block secured to the second end of the spring;
- a first roller having a plurality of roller surfaces, wherein the first roller is first rotatably mounted in the movable block;
- a fixed block secured to the channel;
- a second roller rotatably mounted to the fixed block;
- a bottom guide secured to the second channel end;
- a third roller rotatably mounted in the bottom guide;
- and
- a cord having:
- a first cord end secured to at least one of a rivet spanning the channel, the fixed block, and the bottom guide;
- a middle cord portion routed about the first roller and the second roller;
- and
- a second cord end routed around the third roller, wherein the second cord end is attachable to a window jamb.
Dependencies are inferred from the claim text.