B - Operations – Transporting – 27 – B
Patent
B - Operations, Transporting
27
B
277/12, 144/27
B27B 5/29 (2006.01) A01G 23/091 (2006.01) B23D 59/02 (2006.01)
Patent
CA 1319083
ABSTRACT OF THE DISCLOSURE A tree-felling saw head that is slidably displaceable out of an enclosure by a pair of hydraulic rams and into cutting relationship with a tree, includes a pair of stationary top and bottom plates between which is rotatably mounted a saw disk with replaceable teeth. The disk is driven by a pinion gear of a hydraulic motor engaging a ring gear mounted within a recess of the disk, into which the top plate fits as a protective cover. Intrusion of foreign matter into the saw head through a clearance space between the disk and top plate is inhibited by a trap seal that comprises, in one embodiment, a pair of coplanar annular grooves in the facing circumferential edges of the top plate and the outermost radial boundary of the recess and a semisolid flowable lubricant disposed within the recess, clearance space and grooves. Further embodiments of the trap seal include a similar pair of grooves between corresponding circumferential edges of the disk and bottom plate, as well as annular chambers formed between the facing surfaces of the disk and plates.
574491
Michaels & Associates
Nunweiler M. W. Kenneth
LandOfFree
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