Safety braking mechanism for a portable chain saw

Details Safety braking mechanism for a portable chain saw Safety braking mechanism for a portable chain saw

1975-12-16

1976-11-16

Jones, Jr., James L.

Cutlery

Cutting tools

Saw

30383, 188 77R, 188166, B23D 5702

Patent

active

039914690

ABSTRACT:
A portable chain saw includes a flexible brake band for stopping the cutter chain. A sensing arm is pivotally mounted on the chain saw housing, with the brake band being connected to this sensing arm. The sensing arm is arranged to be engaged by an arm or hand of an operator so as to be swung forwardly in a brake-tightening manner. The sensing arm is continuously biased forwardly to a braking position by a coil compression spring. A latch normally holds the sensing arm in a rest position. The latch comprises a metallic strip one end of which is fixedly secured to the housing. The other end of the strip has a bent configuration defining a notch for receiving a curved projection of the sensing arm to retain the latter. The strip extends forwardly from the housing in overlying position above the spring and projection. The strip is flexed upwardly when the sensing arm is struck by an arm or hand of an operator, the latch is shifted to an unlatching position, allowing the coil compression spring to ram the sensing arm forwardly to tighten the brake band and stop the cutter chain. The mechanism can be conveniently reset by retracting the sensing arm to its rest position, wherein automatic cocking of the sensing arm occurs.

REFERENCES:
patent: 3292742 (1966-12-01), Thomas
patent: 3776331 (1973-12-01), Gustafsson
patent: 3937306 (1976-02-01), Naslund et al.

Affiliated with

Also associated with

Rating

Safety braking mechanism for a portable chain saw does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Safety braking mechanism for a portable chain saw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety braking mechanism for a portable chain saw will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-663267