Guide bar for a saw chain of a motor-driven chain saw

Details Guide bar for a saw chain of a motor-driven chain saw Guide bar for a saw chain of a motor-driven chain saw

1986-08-01

1987-09-15

Watts, Douglas D.

Cutlery

Cutting tools

Saw

B23D 5702, B23D 5904, B27B 1712

Patent

active

046930051

ABSTRACT:
A guide bar for a saw chain of a motor-driven chain saw has a guide groove formed in the periphery thereof. The drive links of the saw chain have projections known as rakers which protrude beyond the side links of the saw chain and which are guided in the guide groove. The guide bar has at least one supply bore in a groove wall through which lubricating oil is supplied for lubricating the saw chain. In the vicinity of the supply bore, a lubricant surface extending approximately parallel to the groove bottom is provided. This lubricant surface extends to at least one supply surface extending as far as the supply bore. The rakers of the drive links move above the lubricant surface with a narrow spacing. The lubricating oil supplied via the supply bore is guided via the supply surface to the lubricant surface where it forms a film into which the rakers extend as the saw chain revolves. This assures that the supplied lubricating oil is picked up by the rakers and carried by them to the link locations of the saw chain thereby assuring very effective lubrication.

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