Saw apparatus with hydraulic tensioning
AssigneeDeere & Company
InventorsMichael Boys, James Roworth
Life of this patent
Estimating the term…
Abstract
A saw apparatus includes a guide bar, a chain driver, and an endless cutting chain trained about the guide bar and the chain driver. A hydraulic chain tensioning apparatus has a hydraulic actuator configured to be driven by a hydraulic power source to act against the guide bar to maintain tension in the cutting chain. A tension release valve is provided between the hydraulic power source and the hydraulic actuator. The tension release valve has a check valve, and a manual override press-button configured to maintain the check valve in an open condition while depressed. The tension release valve has a spring detent configured to maintain the manual override press-button in a depressed condition until selectively released.
Claims13
A saw apparatus comprising:
- a guide bar;
- a chain driver;
- an endless cutting chain trained about the guide bar and the chain driver;
- and
- a hydraulic chain tensioning apparatus, comprising:
- a hydraulic actuator configured to be driven by a hydraulic power source to act against the guide bar to maintain tension in the cutting chain;
- and
- a tension release valve between the hydraulic power source and the hydraulic actuator, wherein the tension release valve comprises:
- a check valve;
- and
- a manual override press-button configured to maintain the check valve in an open condition while depressed, wherein the tension release valve comprises a spring detent configured to maintain the manual override press-button in a depressed condition until selectively released.
A timber-working device, comprising:
- a frame;
- and
- a saw apparatus mounted to the frame, wherein the saw apparatus comprises:
- a guide bar;
- a chain driver;
- an endless cutting chain trained about the guide bar and the chain driver;
- and
- a hydraulic chain tensioning apparatus, comprising:
- a hydraulic actuator configured to be driven by a hydraulic power source to act against the guide bar to maintain tension in the cutting chain;
- and
- a tension release valve between the hydraulic power source and the hydraulic actuator, wherein the tension release valve comprises:
- a check valve;
- and
- a manual override press-button configured to maintain the check valve in an open condition while depressed, wherein the tension release valve comprises a spring detent configured to maintain the manual override press-button in a depressed condition until selectively released.
Dependencies are inferred from the claim text.