Multi-chamber temperature compensated pneumatic counterbalance
US4408751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/52
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pneumatic, piston/cylinder counterbalance in which the counterbalance force is obtained by differential pressure across the piston and in which the force changes due to temperature are compensated by use of a variable volume cylinder having one or more auxiliary chambers separated by walls, each including a temperature responsive bi-metal disc valve normally acting as a check valve permitting flow into the auxiliary chambers but preventing flow out of the chambers except when the temperature drops to a predetermined value. In the multiple auxiliary chamber embodiment, flow into and out from each chamber is controlled by an associated bi-metal disc valve responsive to successively lower temperatures to enable a more linear stabilization of force output regardless of temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.