The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1978
Filed:
Jul. 01, 1977
Applicant:
Inventor:
Sharon Parr Nelson, Houston, TX (US);
Assignee:
Wilson Industries, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166243 ; 166255 ;
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.