US 5,050,303 A · Chain saw bar fluid passage system

Abstract

An improved saw bar and a chain sawing assembly includes a frame which houses a drive engine or motor and receives the saw bar, an endless cutting chain, and a sprocket mechanically coupling the drive engine to the cutting chain. The saw bar includes a bar member having a slot formed therein through at least a portion of the thickness of the bar member, with the slot extending from an attachment end to a nose end of the bar member. The saw bar also has a channel assembly, such as a tubular channel assembly, positioned in cooperation with the slot to deliver fluid from the attachment end to a channel outlet. In one embodiment, the saw bar has an idler sprocket pivotally mounted within a sprocket mounting slot formed at the bar member nose end. The channel outlet opens into the sprocket mounting slot to deliver lubrication fluid to the sprocket teeth. In an alternate embodiment, the channel outlet comprises a plurality of apertures along the length of an exposed wall of the channel member. The plurality of apertures deliver a fluid to a surface which is formed during cutting. A method is also provided of constructing an improved saw bar as described above.

Claims17

Dependent claims

A saw bar for a chain sawing device having a frame, drive means, means for attaching the saw bar to the frame, an endless cutting chain mounted on the saw bar, and means for driving the cutting chain with the drive means, the saw bar comprising:

a bar member having an attachment end for attachment to the frame, a nose end opposite the attachment end, a peripheral edge including guide means for guiding the endless cutting chain about the peripheral edge, and two opposing side surfaces defining a bar thickness therebetween, with one of the side surfaces having a slot formed therein through at least a portion of the bar thickness, the slot extending from adjacent the attachment end to adjacent the nose end;
and
channel means positioned in cooperation with the slot and extending from the attachment end toward the nose end for forming a fluid delivery channel in the saw bar to an outlet means in said channel means for permitting the discharge of fluid therefrom.

A chain sawing assembly comprising:

a frame having reservoir means for storing a fluid;
an endless cutting chain;
drive means for driving the cutting chain;
a saw bar comprising a bar member having an attachment end received by the frame and a nose end opposite the attachment end, a peripheral edge including guide means for guiding the cutting chain about the peripheral edge, and two opposing side surfaces defining a bar thickness therebetween, with one of the side surfaces having a slot formed therein through at least a portion of the bar thickness, the slot extending from the attachment end to the nose end, the saw bar also having channel means positioned in cooperation with the slot and extending from the attachment end to the nose end for forming a fluid delivery channel;
and
a passageway to deliver fluid from the reservoir means to said channel means.

3 more elements

Dependencies are inferred from the claim text.

Chain saw bar fluid passage system

Life of this patent

Chain saw bar fluid passage system

Life of this patent

Abstract

Claims17