| 摘要 |
A clamp member able to be releasably engaged upon a substantially circular (in cross section) member (1) (e.g. a post) with a relatively smooth surface. The clamp member includes a collar member (6) with a shaft (3) comprising a longitudinal recess to accommodate the elongate member and at least one integral recess (3a) tapered with respect to the longitudinal axis of the elongate member. A wedge member (4) is positioned in the integral recess (3a) of the collar member between the inner surface of the collar and the surface of the elongate member. The inner surface of said wedge member (4) is provided with two spaced apart areas of contact (14a,14b) with the elongate member which areas of contact have tangent planes which are at an oblique angle one to the other. The outer surface of the wedge member is shaped to substantially correspond with the recess in the collar member, to provide an interface in which the included angle defined by any tangent planes of the recess -wedge interface substantially exceeds the included angle defined by any tangent planes to the elongate member -wedge member interface area. The arrangement of the invention is such that in use, the inner surface of the wedge member (4) is substantially aligned with the surface of the elongate member (1) by movement of the collar member in one direction. The two spaced apart areas of contact (14a,14b) on the inner surface of the wedge member are by this movement frictionally engaged on the elongate member. The inner surface of the collar member (6) then moves into frictional engagement with the outer surface of the wedge member to frictionally engage the collar member on the clamp member and elongate member. The clamp member is disengageable from the elongate member by moving the collar member in the opposite direction. |
