Patent ID: 7670077
Filing Date: 2010-03-02
Classification: F16C,Y10T

Abstract:
1. A rotatable joint, comprising: a socket comprising a first half socket and a second half socket collectively forming the socket; a rotatable arm comprising a cylinder with an annular engaging groove defined therein; and a connecting device mounted in the socket, the connecting device including a sub-socket, two elastic sleeves, and two pivot shafts, the sub-socket including a first half rotatably received in the first half socket and a second half rotatably received in the second half socket, each of the first half and the second half defining a pivot hole therein for engaging with an outer surface of one of the elastic sleeves, the pivot shafts respectively fixed in the first and second half sockets, an outer surface of each of the pivot shafts engaging with an inner surface of one of the elastic sleeves, the sub-socket defining a through hole therein for rotatably engaging with the rotatable arm, and each of the elastic sleeves comprising a concave portion rotatably received in the engaging groove of the rotatable arm; wherein each of the pivot holes includes an inner surface with a plurality of parallelly aligned elongated grooves defined therein, a plurality of parallelly aligned elongated ribs are formed on the outer surface of each elastic sleeve to engage in the elongated grooves of the inner surface of each pivot hole in a fixed pivot position; a plurality of parallelly aligned elongated grooves are defined in the inner surface of each elastic sleeve, and a plurality of parallelly aligned elongated ribs are formed on the outer surface of each pivot shaft to engage in the elongated grooves of each elastic sleeve in the fixed pivot position, the elastic sleeves resiliently deforming to allow the sub-socket to pivot relative to the pivot shaft.