US 7,320,555 B2
Cardan shaft structure with tightness adjustable functions
Cheng-Chung Chang, Hsi-Chi (Taiwan); and Yi-Fei Yu, Keelung (Taiwan)
Assigned to Sercomm Corporation, Miaoli County (Taiwan)
Filed on Oct. 14, 2005, as Appl. No. 11/251,055.
Prior Publication US 2007/0086849 A1, Apr. 19, 2007
Int. Cl. A61B 17/56 (2006.01); F16C 11/06 (2006.01)
U.S. Cl. 403—122  [403/76; 403/77; 403/114; 403/297; 403/314; 606/53; 606/60; 606/61; 248/288.31; 248/663] 4 Claims
OG exemplary drawing
 
1. A cardan shaft structure with tightness adjustable functions, comprising:
a body having a sphere located at both ends respectively, and a central hole penetrating through both ends and the two spheres, wherein a plurality of grooves are equipped into side walls of the two spheres respectively to outwardly expand the spheres, said grooves passing though said central hole and forming a mutual opening end with a tapered socket portion on each of the two spheres;
a bolt penetrating from one of the spheres through the central hole of said body and the other of the spheres; and
a nut being locked with said bolt and engaged with the tapered socket portion of said other sphere;
wherein one end of said nut has a taper degree corresponding to an inner area of the engaged tapered socket portion of said other sphere.