| 摘要 |
A mechanism (10) for applying a clamping force to a columnar member (20), su ch as a tiebar, is described. The clamping mechanism includes a compressible member (22) surrounding the columnar member (20) for gripping the columnar member and transmitting a clamping force thereto, which compressible member is slidable along the columnar member. The mechanism further includes a clampin g piston (40) for applying a clamping force, which clamping piston (40) has a bore (44) with an engaging surface (46) for receiving and frictionally engaging the compressible member (22). The frictional engagement between the compressible member (22) and the engaging surface (46) prevents any relative sliding movement between the compressible member and the clamping piston. Th e mechanism still further includes a sliding piston (50) for applying a clampi ng force and for causing the compressible member (22) to slide along the column ar member from an initial position to a preload position where the compressible member (22) is compressed by contact with the engaging surface (46) as the compressible member moves between the positions. Compression of the compressible member causes it to grip the columnar member and apply an initi al clamping force. The main clamping force is applied to the compressible membe r and hence to the tiebar by moving the clamping piston (40) to a clamping position. A method for applying a clamping force to a mold using the clamp mechanism of the present invention is also described.
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