Self-locking mule shoe

Details Self-locking mule shoe Self-locking mule shoe

1977-07-01

1978-06-13

Leppink, James A.

Wells

Miscellaneous

166255, E21B 4100

Patent

active

040943607

ABSTRACT:
A mule shoe having a closed key-receiving slot defined by long and short edges therein is characterized by a cam surface thereon connecting the ends of the edges of the slot. The sum of the angular distance occupied by the slot and the angular distance through which the cam surface winds about the axis of the member is equal to at least 360.degree.. An axially directed reaction force generated by abutting contact between the cam surface and a key is converted to a torque acting to cam the mule shoe in only a predetermined angular direction.

REFERENCES:
patent: 1851319 (1932-03-01), McCoy et al.
patent: 2207505 (1940-07-01), Bremner et al.
patent: 2246417 (1941-06-01), Smith
patent: 2536303 (1951-01-01), Miller
patent: 3052309 (1962-09-01), Eastman
patent: 3363703 (1968-01-01), Shewmake
patent: 3718194 (1973-02-01), Hering et al.

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