Chain-saw chain sharpening device
OwnerJohn P. Turnerinventor
Life of this patent
Estimating the term…
Abstract
A saw-chain sharpening device is provided which is releasably attachable to a portable chain saw to enable routing-type saw chain cutters to be sharpened in situ on the chain-saw guide bar. The sharpening device comprises a support bridge clampable to the saw guide bar in a position straddling one pass of the chain. This bridge supports a grinding-wheel mounting arrangement which can be set up to orientate a grinding wheel carried thereby into the plane of the routing-edge face of a cutter to be sharpened. Once correctly orientated, the grinding wheel is driven in rotation by external means (such as a conventional electric drill) and approached towards the cutter along a path lying in said plane. This path is defined by a linear guide of the mounting arrangement, the guide being slanted at the undercut angle of the cutter face.
Claims4
A chain-saw chain sharpening device which is releasably attachable to a portable chain saw to enable routing-type saw chain cutters to be sharpened in situ on the chain saw guide bar, said device comprising a grinding wheel and a mounting arrangement including:
- (a) a support structure releasably attachable to the chain-saw guide bar,
- (b) a pivotable member mounted on said support structure for pivotal movement about an axis extending in the plane of the guide bar and perpendicular to the local direction of advance of the saw chain along said bar,
- (c) a guide structure carried by said pivotable member and including at least one linear guide element which is convergent with said axis in a direction towards the saw chain and makes an angle with a notional plane extending along and perpendicular to the said guide bar corresponding to the desired angle of undercut of the routing edge faces of said cutters,
- (d) a mounting block linearly displaceable along said at least one linear guide element and rotatably mounting the said grinding wheel such that the angle between the plane of the wheel and said notional plane corresponds to the said desired angle of undercut routing edge faces of said cutters.
Dependencies are inferred from the claim text.