Power tool inertia brake
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United States of America Patent
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-
Jun 30, 1992
Grant Date -
N/A
app pub date -
May 15, 1991
filing date -
May 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intertial-manual actuating chain brake for a chain saw in which a mechanical integrator distinguishes between relatively long duration accelerations developed by a 'kickback' producing impulse and normal operating accelerations associated with operational and vibratory forces. Occurrence of a 'kickback' impulse, developing a force of required magnitude, direction, and duration causes a spring-mass accelerometer to change from a brake released to a brake applied condition, applying a braking torque to the saw chain. The accelerometer utilizes a pivotable hand guard as the actuating means. The hand guard also provides for manual operation. The hand guard is comprised of a housing and an inertia weight that is connected to the housing. The weight and type of inertia weight can be selected to provide the brake applied condition for a predetermined movement of the chain saw or for a predetermined type of chain saw. The inertia weight can be adjusted to adjust the accelerometer.
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