Guide bar for a motor chain saw

Details Guide bar for a motor chain saw Guide bar for a motor chain saw

1997-11-21

1998-12-01

Watts, Douglas D.

Cutlery

Cutting tools

Saw

30383, B27B 1702

Patent

active

058422790

ABSTRACT:
A guide bar for a saw chain of a motor chain saw has a single member steel plate having a center plane and a circumferential guide groove for guiding a saw chain extending in the center plane. The steel plate has a longitudinal extension and a height perpendicular to the longitudinal extension. The steel plate has a cutout extending over a portion of the longitudinal extension and over a portion of the height. A filling member, consisting of a casting material having a smaller density than the steel plate, is cast into the cutout. The cutout has a circumferential edge facing the filling member. The circumferential edge has undercuts uniformly distributed along the circumferential edge. The filling member has a shrinkage rate of at least 0.5% for engaging positive-lockingly the undercuts upon solidification of the casting material to thereby create a uniformly distributed pretension within the center plane of the guide bar in the unloaded state of the guide bar.

REFERENCES:
patent: 4903410 (1990-02-01), Weininger et al.
patent: 5025561 (1991-06-01), Sugihara et al.
patent: 5035058 (1991-07-01), Date et al.
patent: 5067243 (1991-11-01), O'Neal
patent: 5249363 (1993-10-01), Mitrega et al.
patent: 5271157 (1993-12-01), Wieninger et al.

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