Constant force window balance shoes for a pivotable window
US11072957B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 2019 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Nov 8, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/148
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A constant force window balance system includes a mounting bracket defining a longitudinal axis, a coil spring, and a shoe. The shoe includes a first arm having a first inner surface and a second arm having a second inner surface. The shoe also includes a member extending between the first arm and the second arm. An opening is defined between the first inner surface, the second inner surface, and the member. The opening is configured to removably receive a portion of a pivot bar. The shoe is moveable between a locked position that prevents movement of the shoe along the longitudinal axis, when the pivot bar is not received within the opening, and an unlocked position that allows movement of the shoe along the longitudinal axis, when the pivot bar is received within the opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.