Method of controlling a swinging boom and apparatus for controlling the same
US6868672B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2003 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Oct 14, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B13/0403
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A swing speed compensation device is provided for use with a flow sharing hydraulic system. The present invention is mounted within the metering spool of a flow sharing valve and includes a poppet that is attached to a spring retainer. The spring retainer encases a compression spring which pushes against a plug and has a drain hole that, depending upon the position of the spring retainer and poppet combination, can vent excess pressure within the present invention to a hydraulic pump tank. When a flow sharing hydraulic system starts or stops, there is a rush in the fluid flow that can cause a spike in the system pressure. The present invention absorbs this pressure spike, allowing for the fluid flow to gradually increase or decrease as the system starts or stops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.