Patent ID: 7310184
Filing Date: 2007-12-18
Classification: G02B

Abstract:
1. A cylindrical body of a Newton reflective telescope, comprising a first cylindrical body and a second cylindrical body combined together, said first cylindrical body provided with an eyepiece on its outer surface, a joint member connected between said first and said second cylindrical bodies to let said first cylindrical body rotate with the second cylindrical body as a pivot, said first and second cylindrical bodies having coincident center axes that remain coincident even when said first cylindrical body is rotated relative to said second cylindrical body, wherein said joint member provided between said first and said second cylindrical bodies includes: a fixing ring fixed around a connecting end of said first cylindrical body, said fixing ring having one end extending out of the connecting end and an inner annular projection formed in an inner wall, said fixing ring having an annular groove formed in its upper side: an elastic ring fixed around a connecting end of said second cylindrical body, said elastic ring having many teeth formed radially in an upper end, each said tooth extending out of the connecting end and having a curved-out tip: and, said inner annular projection of said first cylindrical body contacting the end edge of said second cylindrical body, said curved-out tips of said teeth of said elastic ring of second cylindrical body fitting in said annular groove of said fixing ring of said first cylindrical body, said elastic ring of said second cylindrical body having an expanding-out pressure against said inner annular projection of said fixing ring of said first cylindrical body so that said annular projection closely and without any gap contacts the end edge of the connecting end of said second cylindrical body, wherein when said first cylindrical body is rotated relative to said second cylindrical body, said eyepiece rotates with the first cylindrical body from a first position to a second position without affecting the coincidence of the axes of the first and second cylindrical bodies, thereby permitting a first user to look through the eyepiece at the first position and a person other than the first user to look through the eyepiece at the second position, without having to change the focus of the eyepiece and without the first user having to move to a different position.