Motor chainsaw with a chain braking device

Details Motor chainsaw with a chain braking device Motor chainsaw with a chain braking device

1996-05-10

1998-09-29

Payer, Hwei-Siu

Cutlery

Cutting tools

Saw

30381, 188 77W, B27B 1700, F16D 4904

Patent

active

058131230

ABSTRACT:
A motor chainsaw has a housing enclosing a motor with actuator and a saw chain. A braking device for the saw chain is positioned in the housing. The braking device has a brake drum and a brake band guided around the brake drum. The braking device has a brake lever connected to the housing so as to be pivotable about a first axis of rotation for moving the brake band from a release position into a braking position. A return kick brake for actuating the braking device is provided. The return kick brake has a ready position and an actuated position in which the brake band is in the braking position. The return kick brake has a hand protection grip, a control lever, and a return kick brake spring for loading the control lever. The control lever, when the return kick brake is moved from the ready position into the actuated position, pivots the brake lever into the braking position. A coasting brake for actuating the braking device has a transmission member, connected to the actuator and the brake lever, and a coasting brake spring for loading the brake band in the braking position. The brake lever has a second axis of rotation extending parallel to the first axis of rotation. The brake lever pivots about the second axis of rotation when the coasting brake is actuated.

REFERENCES:
patent: 4493400 (1985-01-01), Nagashima et al.
patent: 4594780 (1986-06-01), Schliemann et al.
patent: 4683660 (1987-08-01), Schurr
patent: 5480009 (1996-01-01), Wieland et al.

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