Patent ID: 7315620
Filing Date: 2008-01-01
Classification: G06F,H04M,Y10T

Abstract:
1. A small-sized opening and closing device which relatively connects connecting portions of a first member and connecting portions of a second member, which construct a small-sized electronics device, with each other to open and close, comprising: a shaft; a cam member attached to said shaft passing in a central axial direction, having a 180 degrees symmetric cam portion composed of a convex portion and a concave portion on one end phase thereof, and arrested its rotation by one connecting portion of either said first member or said second member; a slider cam attached slidably to said shaft passing through in a central axial direction thereof and facing to said cam member, having a 180 degrees symmetric cam portion composed of a convex portion and a concave portion on a side thereof facing said cam portion of said cam member, and arrested its rotation by the other connecting portion of either said first member or said second member; a compression spring wound around said shaft to push said slider cam toward said cam member side; wherein each cam portion of said cam member is separated into an inner cam convex portion located on an axial core side and an outer cam convex portion located on an outer circumferential side, and said inner cam convex portion faces to said outer cam convex portion over an axial core portion; wherein each cam portion of said slider cam consists of a 180 degrees symmetric inner cam comprising two pairs of convex portions located on an axial core side and concave portions, and a 180 degrees symmetric outer cam comprising two pairs of convex portions located on an outer circumferential side with one pair displaced from the other pair, and said inner cam and said outer cam are each formed with a gap in a circumferential direction relative to positions of said inner cam convex portion and said outer cam convex portion, and; wherein said inner cam and said outer cam faces to said inner cam convex portion and said outer cam convex portion respectively.