A friction tiebar clamp

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/67 (2006.01) B29C 33/20 (2006.01) B29C 45/64 (2006.01) B30B 1/32 (2006.01)

Patent

CA 2368053

A mechanism (10) for applying a clamping force to a columnar member (20), such 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 clamping 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. The mechanism still further includes a sliding piston (50) for applying a clamping force and for causing the compressible member (22) to slide along the columnar 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 initial clamping force. The main clamping force is applied to the compressible member 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.

L'invention concerne un mécanisme (10) permettant d'appliquer une force de serrage sur un élément (20) en forme de colonne tel qu'une colonne de presse. Ce mécanisme de serrage comprend un élément (22) compressible qui entoure la colonne (20) et vient saisir la colonne et transmettre une force de serrage à cette dernière. Cet élément compressible peut coulisser le long de la colonne. Ce mécanisme comprend en outre un piston (40) de serrage permettant d'appliquer une force de serrage. Ce piston (40) de serrage comprend un orifice (44) traversant qui comprend une surface (46) de contact destinée à recevoir l'élément (22) compressible de manière à produire un frottement entre ce dernier et la surface de contact. Ce frottement entre l'élément (22) compressible et la surface (46) de contact empêche le glissement relatif de l'élément compressible et du piston de serrage. Ce mécanisme comprend en outre un piston (50) coulissant permettant d'appliquer une force de serrage et entraînant le glissement de l'élément (22) compressible le long de la colonne entre une position initiale et une position de précharge dans laquelle la surface (46) de contact entre en contact avec l'élément (22) compressible et le comprime lorsque l'élément passe d'une position à l'autre. Lorsqu'une compression est exercée sur l'élément compressible, ce dernier vient saisir la colonne et applique une force de serrage initiale. On applique la force de serrage principale à l'élément compressible, et par conséquent à la colonne, en déplaçant le piston (40) de serrage de manière à le mettre en position de serrage. L'invention concerne également un procédé permettant d'appliquer une force de serrage sur un moule au moyen du mécanisme de serrage décrit.

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