Tree stem feeding device for timber harvesters
US4834156A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27L1/045
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A feeding device for longitudinally feeding a tree stem comprises a breast part (2, 2') to be applied against the stem, and two separate feeding units (3, 3'), suitably in the form of endless chains which are movable towards and away from each other, such that they can be pressed against opposite sides of the stem. Each feeding unit is mounted on a holder (7) which is connected to a frame (1) carrying the breast part, by means of a parallel arm system comprising two arms (8, 9) each connected to the holder (7) and the frame (1) by joints 10, 11, 12, 13) whose axes of rotation extend at an acute angle to the axes of rotation of the feeding units. A piston and cylinder assembly (14) is mounted in a conventional way between diagonally opposite joints in the parallel arm system for pivoting the arms relative to the frame for automatically centering the device relative to the tree stem irrespective of varying stem diameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.