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US 3,937,306 AGranted
Automatic brake actuator for a chain saw
AssigneeHusqvarna AB
InventorsUlf Vilheim Naslund, Egil Skog
Life of this patent
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Abstract
A device for automatically actuating a band brake on a motor saw for emergency stopping of the saw chain, wherein a latching mechanism including pretensioned elastic force-providing coupling is released, occurring upon a throw movement of the saw, by a pin or the like transferring a force between a carrying handle of the saw and a collapsable arm of the mechanism.
Claims4
A motor saw of the kind having a driven drum;
- a band brake around the drum;
- a pre-tensioned elastic means for supplying a tensioning force to the band;
- a resilient, fixed carrying handle insulated by elastic elements against vibration;
- a collapsible arm pivotably connected to a part of the saw which is not insulated against vibrations and arranged adjacent said handle;
- a latching mechanism actuatable by said collapsible arm which, when released by actuation of the collapsible arm, is arranged to release the brake so that the said band is brought into operation by means of said pre-tensioned elastic means, the improvement which comprises a projection means extending between the carrying handle and the collapsible arm for transmitting a force occurring upon a throw movement of the saw to release said latching mechanism without the operator's hands leaving said carrying handle.
2 more elements
Dependencies are inferred from the claim text.