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:
May. 05, 1997
Filed:
Sep. 27, 1994
William M Appleman, Davidsonville, MD (US);
Abstract
A coupling for a torsional drive includes a rotatable shaft, an outer surface of which has a keyway comprising a half-round groove. A rotatable hub disposed around the shaft and coaxial with the shaft has an inner surface provided with a second keyway, the second keyway also having a half-round groove. The two keyways are alignable so as to form a cylindrical keyway between the hub and the shaft. A cylindrical key is insertable into the cylindrical keyway between the shaft and the hub to prevent relative rotation therebetween. A plug disposed inside the rotatable shaft prevents radial deformation of the shaft. The material of the hub and the shaft may differ, in which case the material of the key is optimized to reduce stress concentrations and stiffness differentials between the hub and the shaft. The cylindrical key and the cylindrical keyway also may be conically tapered. The formed keyway and key may also be elliptical.