Apparatus for providing constant torque output from a door closer or operator
US10030425B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2014 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Jan 19, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door closer or operator includes a pivoting pinion on the door closer housing for transmitting door motion, and a cam connected thereto. A connecting member extends along a spring and engages the peripheral edge of the cam. Rotation of the cam causes a change in length of the portion of the connecting member between the position tangent to the cam peripheral edge and the spring second end to expand or compress the spring, resulting in a force transmitted along a longitudinal axis of the connecting member as a result of spring deflection. The cam peripheral edge has a profile with a varying radial distance between the cam axis and the connecting member at the position tangent to the cam peripheral edge such that the radial distance is changed as the spring expands or compresses to maintain a desired constant torque about the axis of the cam and pinion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.