| 摘要 |
An inertial-manual actuating safety 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. The operation of the integrator causes the nullification of the operational and vibratory forces. Occurrences 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 mass. The hand guard also provides for manual operation. In manual operation the release force is applied manually. |
