Automatic line feed head apparatus for a flexible line trimmer or the like
US4897923A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49696
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A flexible line trimmer is provided with an automatic line feeding cutting head portion which utilizes a generally U-shaped, centrifugally actuated balancing arm member to maintain the free end cutting length of the line at a predetermined length during trimmer operation. The balancing arm is rotatably mounted within the head by means of a coil spring element which is installed on one of the leg portions of the balancing arm and press-fitted into a plastic pocket portion of the head to serve as a bearing for the balancing arm. The outer end of the spring-carrying leg has a transverse pigtail portion which may be selectively sized to predeterminably vary the controlled cutting length of the line. The opposite leg of the balancing arm, which is engaged by the line during trimmer operation, is received within spool flange notches when the arm is in its line locking position to prevent undesirable bending of the arm due to cutting line forces thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.