Circular saw and method for fixing main spindle thereof

B - Operations – Transporting – 23 – D

Patent

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Details

B23D 61/02 (2006.01) B23D 47/00 (2006.01) B27B 5/32 (2006.01) B27B 33/08 (2006.01)

Patent

CA 2442121

A structure of circular saw in which the critical number of revolution is not lowered even if the saw is made thin but can be doubled as compared with a conventional circular saw by solving the drawback of prior art that the critical number of revolution decreases as the circular saw is made thinner to cause buckling, and a method for fixing a circular saw to a main rotary spindle. Three slits are made in the body of a circular saw having a central hole to extend radially from the central hole or the vicinity thereof at a required angle, and the end of the slit is set within an annular range of 60- 75% of the radius at the bottom of the circular saw. When such a circular saw is fixed to a main rotary spindle, the circular saw is clamped from the opposite sides by means of a pair of flanges provided on the main rotary spindle such that movement of the body of circular saw is restricted in the thickness direction but radial enlargement/contraction incident to expansion/shrinkage of the body is allowed.

L'invention concerne la structure d'une scie circulaire dans laquelle le nombre critique de révolutions ne baisse pas même si la scie est mince, mais peut être doublé par rapport à une scie circulaire classique, si l'on résout les problèmes posés par la technique actuelle, à savoir que le nombre critique de révolutions diminue à mesure que la scie circulaire est plus mince, ce qui provoque le flambage. L'invention concerne également un procédé permettant de fixer une scie circulaire à une broche rotative principale. Trois fentes sont pratiquées dans le corps d'une scie circulaire ayant un trou central de façon à se prolonger de manière radiale à partir du trou central ou de sa proximité suivant un angle requis, l'extrémité de la fente étant fixée dans une gamme annulaire de 60-75% du rayon au bas de la scie circulaire. Lorsqu'une telle scie circulaire est fixée à une broche rotative principale, elle est serrée des côtés opposés au moyen de brides placées sur ladite broche, le mouvement du corps de la scie circulaire est ainsi bloqué dans le sens de l'épaisseur, l'élargissement et/ou la contraction radial(e) incident(e) par rapport à l'expansion et/ou au retrait du corps étant cependant admis.

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