Trimmer head for use in flexible line rotary trimmers having improved line loading mechanism
US7762002B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | May 30, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D34/4163
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A trimmer head for use in a flexible line rotary trimmer including a housing adapted to be operatively connected to the trimmer to effect rotation of the head and a spool operatively connected to the housing for rotation therewith. The spool defines at least one inwardly extending line receptor channel, preferably formed by a plurality of inwardly tapered walls so as to be polygonal in cross-section. So configured, the channel walls will securely grip the cutting line upon the line being inserted in the channel and wound about the spool. To provide uniform winding of the line, a plurality of cam, cam abutment and sliding surfaces are operatively connected to the housing and spool such that when the spool is manually rotated relative to the housing in the drive direction, the spool is caused to reciprocate axially within the housing evenly distributing the line about the body of the spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.