B - Operations – Transporting – 27 – B
Patent
B - Operations, Transporting
27
B
B27B 17/14 (2006.01) B27B 17/02 (2006.01) B27B 17/04 (2006.01)
Patent
CA 2109263
ABSTRACT OF THE DISCLOSURE A chain saw has a guide bar, around which a saw chain rotates, with the guide bar having two opposed nose plates at the free end thereof. Each nose plate has an outwardly formed impression which faces the outwardly formed impression in the opposed nose plate, to allow a thicker idler roller assembly to be mounted between the outwardly formed impressions. The idler roller assembly includes an inner bearing journal, roller bearings, and an idler roller with a concave groove around its outer circumference, within which groove the drive links of the saw chain track as the saw chain rotates around the idler roller. Two thin shims are placed on opposite sides of the idler roller assembly between the nose plates and the idler roller assembly to facilitate mounting of the idler roller assembly between the nose plates. A replacement nose assembly is also disclosed for a chain saw guide bar which contains an idler roller bearing mounted at the free end of the guide bar. The replacement nose assembly includes two substantially identical outer plates positioned apart a given distance. An idler roller bearing assembly is positioned between the two outer plates, and includes an inner bearing journal having a thickness the same as the given distance, bearings, and an outer idler roller having a thickness smaller than the given distance and the inner bearing journal. The replacement nose assembly is fitted and attached longitudinally to the guide bar by extending portions of the two outer plates which fit into recesses provided on the end of the guide bar so that the attached nose assembly is substantially the same thickness as the guide bar.
Griffiths & Beerens Pty Ltd.
Mcfadden Fincham
LandOfFree
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