| 摘要 |
Clamp of the type which can be fitted to a tractor or similar vehicle and is composed of individual complementary parts which are used to seize the trunks of trees, vibration being achieved by means of the rotation of an inertial mass by means of a hydraulic motor, said inertial mass being eccentric, giving rise to a variation of centrifugal force which generates the vibration at high frequencies of rotation, smoothing the start and end of vibration by means of a recoil spring (reactive spring, antagonistic spring) which reduces or increases its opposition to said force proportionally. <IMAGE>
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