Cutlery – Cutting tools – Saw
Patent
1975-05-19
1976-11-23
Halvosa, George E. A.
Cutlery
Cutting tools
Saw
74 97, 188 77W, 192 81R, B23D 5702, B27B 1700, F16D 4904
Patent
active
039927792
ABSTRACT:
A brake for quickly stopping the cutting chain of a chain saw in the event of a kickback or other mishap comprises a narrow band of spring steel which wraps at least 11/4 turns around the drum of the centrifugal clutch by which the chain is driven. One end of the band is anchored while the other end is connected to an operating lever which is rotatable between a released position in which the brake band is released from the drum and an applied position in which the brake band is applied to the drum. The operating lever has a peripheral portion which has an interfering engagement with a cooperating portion on a rotatable actuating lever to which a guard or other sensing member is connected. By reason of this interfering engagement the operating lever remains in one or the other of its positions until forcibly moved to the other position by the guard member operating through the actuating lever. The mechanism can thus be set with the operating lever in released position and tripped by force applied to the guard member to rotate the actuating lever and thereby actuate the operating lever to bring the brake band into engagement with the drum. By reason of its wraparound, the brake band thereupon grips the drum so as to bring the drum and hence the cutting chain to a quick stop. A light spring is provided for biasing the operating lever toward the applied position.
REFERENCES:
patent: 1179618 (1916-04-01), Elgert et al.
patent: 1736849 (1929-11-01), Douglas
patent: 2754688 (1956-07-01), Barecki
patent: 3776331 (1973-12-01), Gustafsson
Marks Michael R.
Strickland, Jr. James P.
Adams Bruce L.
Burns Robert E.
Halvosa George E. A.
Lobato Emmanuel J.
Textron Inc.
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