| 摘要 |
<p>In order to allow a first element (2) and a second element (1) to be tightly clamped together, and yet be easily and quickly unclamped for adjustments to be made to their relative positions, a rotatable clamp is provided. The rotatable clamp comprises three main parts: a first circular plate (4) attached to the element (2) and having a bolt (5) extending from the centre thereof, a second circular plate (6) attached to element (1) and having a bolthole (7) at the centre thereof and a nut (8) having a handle (9) attached thereto for screwing onto the bolt (5) so as to force the two circular plates together. Each of the two plates (4) and (6) is provided, on the face contacting the other plate, with a series of circular, concentric grooves (12) and ridges (13) arranged to fit together with the ridges of one plate fitting into the grooves of the other plate as the plates are brought into contact with each other. The provision of the grooves and ridges on the faces of the plates contacting each other substantially increases the frictional forces between the plates when they are in contact so that they do not require a very large contact force to be and yet provide adequate clamping force. This means that the nut can be easily loosened when required and the circular shape of the ridges and grooves allows the plates to be rotated with respect to each other without the plates having to be completely separated from each other.</p> |
