Automatic head for a line trimmer

Details Automatic head for a line trimmer Automatic head for a line trimmer

1990-12-06

1991-10-29

Watts, Douglas D.

Cutlery

Cutting tools

With blade moving means

30347, B26B 700

Patent

active

050603841

ABSTRACT:
An automatic line trimmer head 10 including a housing 11 containing a rotor 12 which controls rotation of a spool 16 relative to the housing in a stepwise fashion which is actuated by centrifugal force. Centrifugal force acts upon a radially expansible annular member 14 which is disposed between the housing 11 and the rotor 12. The spool 16 contains a supply of line 18 and is attached to the rotor 12 for rotation with the rotor. A shaft extends through the housing 10, rotor 12 and spool 16. The rotor 12 is biased by a helical spring 24 toward an upper plane of rotation. The radially expandable annular member 14 shifts the rotor 12 to a lower plane when centrifugal force expands the annular member 14. Teeth 54 extending radially outwardly from an outer edge 56 of a circular disk portion 50 of the rotor 12 contact an upper set of stop blocks when the circular disk portion 50 is in the upper plane. The teeth 54 contact a lower set of stop blocks 42 when the circular disk portion 50 is in the lower plane.

REFERENCES:
patent: 4097991 (1978-07-01), Proulx
patent: 4104796 (1978-08-01), Sheldon
patent: 4131997 (1979-01-01), Utter
patent: 4136446 (1979-01-01), Tripp
patent: 4145809 (1979-03-01), Proulx
patent: 4151646 (1979-05-01), Lane
patent: 4161820 (1979-07-01), Moore
patent: 4167812 (1979-09-01), Moore
patent: 4168572 (1979-09-01), Ewing
patent: 4185381 (1980-01-01), Palmieri et al.
patent: 4194287 (1980-03-01), Palmieri et al.
patent: 4195408 (1980-04-01), Palmieri et al.
patent: 4203212 (1980-05-01), Proulx
patent: 4242797 (1981-01-01), Palmieri et al.
patent: 4259782 (1981-04-01), Proulx
patent: 4274201 (1981-06-01), Oberg et al.
patent: 4366621 (1983-01-01), Mitchell
patent: 4369577 (1983-01-01), Gise et al.
patent: 4419822 (1983-12-01), Harris
patent: 4426780 (1984-01-01), Foster
patent: 4458419 (1984-07-01), Proulx
patent: 4476632 (1984-10-01), Proulx
patent: 4524515 (1985-06-01), Oberg
patent: 4566189 (1986-01-01), Muto
patent: 4607431 (1986-08-01), Gay
patent: 4633588 (1987-01-01), Pittinger, Jr.
patent: 4651421 (1987-03-01), Zerrer
patent: 4660286 (1987-04-01), Engelbrecht et al.
patent: 4667410 (1987-05-01), Weid et al.
patent: 4738085 (1988-04-01), Nishio et al.
patent: 4790071 (1988-12-01), Helmig et al.
patent: 4817288 (1989-04-01), Hirose et al.
patent: 4823465 (1989-04-01), Collins
patent: 4835867 (1989-06-01), Collins et al.
patent: 4882843 (1989-11-01), Baba
patent: 4897923 (1990-02-01), Collins
patent: 4926557 (1990-05-01), Haupt
patent: 4989321 (1991-02-01), Hoffmann
Booklet Entitled "Outdoor Power Equipment", Buyers Guide-Dated Dec. 1989-p. 29.

Affiliated with

Also associated with

Rating

Automatic head for a line trimmer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic head for a line trimmer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic head for a line trimmer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1390685