Automatic cushioning control apparatus for cylinder of working machine
US5511458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Jul 20, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/2214
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An automatic cushioning control apparatus for a cylinder of a working machine provides a quiet cylinder cushioning effect, causing little shaking of a vehicle body, without using a mechanical cylinder cushion. To obtain such an effect, this apparatus is provided with a means (1) for detecting the position of a working machine cylinder in the direction of a stroke thereof, a means (2) for detecting the direction of extending and retracting movement of the cylinder of the working machine, a means (3) for computing lever gain (K) with respect to a lever signal from a lever (4), which is adapted to satisfy the relation, 0<K<1, in accordance with signals from the means (1,2), and gradually changes from one toward zero in accordance with the distance between the free end of the cylinder and a stroke end thereof when the cylinder is moved toward its stroke end, a multiplication element (5) adapted to multiply an operating instruction from the lever (4) by the lever gain K, and a means (6) for controlling the driving of the cylinder of the working machine in accordance with an output from the multiplication element (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.