Methods of assembling a chain and a rivet for use in such...

B - Operations – Transporting – 27 – B

Patent

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B27B 33/14 (2006.01) B21J 15/02 (2006.01) B21L 9/06 (2006.01) F16B 19/06 (2006.01)

Patent

CA 2247380

A saw chain of a chain saw has its side links and center links interconnected by rivets. Prior to being staked, each rivet is in blank form and includes a cylindrical flange and a pair of barrels extending from opposite sides of the flange along a center axis thereof. Each barrel includes an axially inner cylindrical section and a tapered axially outer section. When the rivet is staked, the center section of each barrel fills a cylindrical portion of a hole formed in a respective side link, and the tapered section fills a chamfered portion of the hole to form a rivet head. The staked rivet bears against a wall of the cylindrical portion of the hole with a greater force than that with which the rivet bears against a wall of the tapered portion of the hole.

Chaîne de scie d'une scie à chaîne dont les maillons latéraux et les maillons centraux sont interconnectés par des rivets. Avant d'être frappé, chaque rivet se présente sous la forme d'une ébauche comportant une platine cylindrique et deux fûts s'étendant à partir des faces opposées de la platine selon son axe central. Chaque fût comporte une section cylindrique interne et une section cylindrique externe qui est conique dans le sens de l'axe. Lorsque le rivet est frappé, la section centrale de chaque fût envahit la partie cylindrique d'un orifice ménagé dans un maillon latéral correspondant et la section conique envahit la partie chanfreinée de l'orifice pour constituer la tête de rivet. Le rivet frappé porte contre une paroi de la partie cylindrique de l'orifice avec une force supérieure à celle selon laquelle il porte contre la paroi de la section conique de l'orifice.

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