| 摘要 |
<p>The invention which is the subject of this application relates to screw clampling apparatus for the application of a clamping force onto an article. The apparatus comprises a shank and a drive means for exerting a driving force on the shank to screw the same into a bore to exert a clamping force on an article. The shank is provided to shear once a predetermined turning torque from the drive means, and hence clamping force, is achieved and the plane of shear can be accurately determined relative to the surface of the article in which the bore is formed and into which the shank is screwed. This is an advantage over the conventional clamping screw which is provided to shear at one fixed weakened location and, when sheared, can leave an undesirable protruding portion above the surface of the article. The current invention allows a one size shank to be used for clamping articles of different sizes and the position of the planar shear can be located at a position along the length of the shank thereby eliminating the occurence of protrusions when shear occurs.</p> |
