Saw chain having cutter link with central pivot on bottom edge

Details Saw chain having cutter link with central pivot on bottom edge Saw chain having cutter link with central pivot on bottom edge

1991-09-06

1992-03-03

Yost, Frank T.

Cutting

Cutter assemblage or cutter element therefor

83834, B27B 3314

Patent

active

050922114

ABSTRACT:
A saw chain is disclosed which includes cutting links having a central pivot on the bottom or inner edge of such cutting link which contacts the track of a saw bar on which the chain is mounted. A front foot portion and a rear foot portion which extend from the central pivot to the front end and the rear end, respectively, of the cutting link are normally spaced from such track when it is not cutting. The cutting link tilts about the pivot rearwardly and forwardly during cutting to provide a smooth rocking motion which reduces vibration and injury to the operator. One embodiment of the cutting link employs a single pivot located centrally between the front rivet opening and rear rivet opening. Another embodiment of the cutting link employs two pivots which are spaced apart and are both located centrally between the front and rear rivet openings. The saw chain includes side cutting links and side tie strap links connected by rivets to central drive links. Such drive links may also be provided with guard portions which extend outward in front of depth gauge portions of the cutting links to reduce kickback.

REFERENCES:
patent: 4122741 (1978-10-01), Engman et al.
patent: 4567803 (1986-02-01), Anderson
patent: 4573386 (1986-03-01), Lindemann et al.
patent: 4643065 (1987-02-01), MacGavin
patent: 4750395 (1988-06-01), Doiron
patent: 4898057 (1990-02-01), Hille

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