Implements or apparatus for applying pushing or pulling force – Wedge
Patent
1979-11-27
1981-05-26
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Wedge
144 34A, 254131, B66F 300
Patent
active
042693934
ABSTRACT:
A tree-felling implement is disclosed, which is particularly effective for felling frozen trees. The implement is of the type comprising flat plate with a front transverse straight edge, a lever arm being rigidly secured to the top face of the flat plate and extending upwardly at an acute angle rearwardly from the flat plate. This implement is characterized by the provision of a bite member which downwardly projects from the bottom surface of the plate along the front transverse edge. Said bite member has a generally rectangular cross-section providing parallel front and rear flat side faces substantially perpendicular to the bottom surface of the plate and a flat edge surface substantially parallel to the bottom surface of the plate. The plate and the bite member are thin enough to be inserted into a saw kerf made in the trunk of a frozen tree. Upon pivoting of the plate within the kerf by means of the lever arm, the bite member enters into the lower frozen kerf surface without cracking the ice, and the uncracked ice provides an effective abutment to prevent the flat plate from slipping out of the kerf.
REFERENCES:
patent: 326621 (1885-09-01), Brackett et al.
patent: 498677 (1893-05-01), McDonald
patent: 2843932 (1958-07-01), Ferguson
patent: 3257018 (1966-06-01), Miles
patent: 3953048 (1976-04-01), Vincent et al.
patent: 4030700 (1977-06-01), Dushku
patent: 4130270 (1978-12-01), Andersson
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