Title: Rotary harrows

Abstract: A safety coupling between a driving coupling and a driven coupling has a shear pin operative connection that shears upon overload, allowing relative movement between the two couplings. The shear pin is urged to establish a second operative connection after limited relative movement between the couplings. In each operative connection, respective stops retain the pin against further displacement. In one application, soil working rotors are rotated by shafts coupled to tool supports. One or more of the driving shafts can be connected to its driven support through a shear pin. A flange on the shaft has an opening that houses the lower part of the pin and the tool support has a bore that houses an upper pin part. Upon shear, the flange turns and a spring urges the remainder of the upper pin part downwardly, whereupon a recess in the flange engages that part and a second operative connection is established.

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Inventors: van der Lely, Cornelis (Zug, CH)

Application Number: 823147
Filing Date: 1977-08-09
Publication_date: 1980-01-15
Assignee:
Primary Class(es): 464/33 172/49.5, 172/103, 172/271
Other Classes:
US Patent Ref:

1740838	Dec, 1929	Roesen	64/28.
1778477	Oct, 1930	Wood	64/28.
1972601	Sep, 1934	Regan	64/28.
2384188	Sep, 1945	Mercier	64/28.
3049898	Aug, 1962	Voth	64/28.

Other Refs: 109097524498

Oct, 1960	DE
Apr, 1961	DD

Primary Examiner: Myhre, Charles J.
Assistant Examiner: Turner, R. C.
Attorney: Mason, Mason and Albright