Earth working – With drive means for tool or cleaner – With specific relationship of mast-type hitch to implement
Patent
1978-02-22
1980-07-01
Johnson, Richard J.
Earth working
With drive means for tool or cleaner
With specific relationship of mast-type hitch to implement
172 59, 172103, 172117, 172271, A01B 6104
Patent
active
042102090
ABSTRACT:
An implement is connectable to the lifting hitch of a tractor and at least one rotary tool is driven to rotate about an upwardly extending axis. The tool or a trestle frame has an overload connection that allows the tool or frame to pivot to an inoperative position upon overload. The tool can be a blade on a carrier part that is pivoted to a support part on a spoke and a shear pin interconnected to prevent such pivoting unless tripped by overload. The parts can have a discharge arrangement that ejects the sheared pin portion from a recess in one part. Upon adjustment of the tool, the pin remainder can effect reconnection. In another embodiment, the trestle frame is coupled to a three point hitch and the implement can be tripped through a pivot connection, including a strut made up of two shaft parts, one of which holds a shear pin and the other receives a pin portion near the junction of the parts. The pin element normally prevents relative pivoting of the implement relative to the tractor connection. Upon overload the strut jack-knifes to allow the entire implement to pivot relative to the trestle.
REFERENCES:
patent: 230180 (1880-07-01), Franklin
patent: 2193157 (1940-03-01), Ayo
patent: 2395342 (1946-02-01), Morkoski
patent: 2640404 (1953-06-01), Scholfield
patent: 2747486 (1956-05-01), Wilson
patent: 2747489 (1956-05-01), Silver
patent: 3503455 (1970-03-01), Oerman
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