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US 6,148,547 AGranted
Chain saw guide bar for tree harvester
AssigneeBlount, Inc.
InventorsChristopher David Seigneur, Duane M. Gibson
Life of this patent
Estimating the term…
Abstract
A chain saw guide bar for a tree harvester is arranged to yield when an excessive force is applied such as when the guide bar becomes jammed in a cut. Yielding of the guide bar protects the bar holder from damage. The guide bar is heat treated or otherwise structurally modified to provide the desired yield strength.
Claims10
A combination guide bar and bar holder for mounting the guide bar to a chain saw of a tree harvester comprising:
- a bar holder for mounting to a tree harvester;
- a saw chain guide bar having a nose end and a tail end;
- said bar holder including a pair of mounting bosses and said tail end having a configured end portion fitted between said bosses with the bar mounted to said bar holder, said bosses cooperatively providing a non-pivotal relationship between said bar holder and bar;
- said bar holder and said guide bar subjected to a varying pivotal force during operation of the tree harvester that cooperatively stresses the boss and the tail end of the bar, said boss being breakable at a determined pivotal force and said tail end designed to break at a pivotal force less than the determined pivotal force.
1 more element
A combination guide bar and bar holder for mounting the guide bar to a chain saw of a tree harvester comprising:
- said bar holder including a pair of bosses, said guide bar having a configured tail end including a slot defining finger portions on each side of the slot, said configured tail end slidably fitting onto the pair of bosses with a boss on each side of one of said finger portions and as fitted resisting pivoting as between the bar holder and guide bar.
Dependencies are inferred from the claim text.