Drill powered reciprocating saw

B - Operations – Transporting – 23 – D

Patent

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Details

B23D 49/10 (2006.01) B23D 51/16 (2006.01) B23D 57/00 (2006.01) F16D 7/02 (2006.01)

Patent

CA 2301892

A drill powered reciprocating saw (100) including a safety gear assembly (300) which disengages the saw's drive mechanism should the operator lose his or her grip on the saw housing (110). The gear assembly includes a motor drive shaft (120) that is connected to an electric drill and which drives a jackshaft (155) by a means of a pair of interlocking gears. At rest, the drive shaft is biased by a spring (220) to a position where the gears are not in contact with each other. When the operator pulls the saw housing toward the drill, the spring is compressed and the gears are engaged, thus allowing the saw to operate. Should the operator lose his or her grip on the housing, the spring biases the drive shaft back to its original position, thereby disengaging the gears.

La présente invention concerne une scie à mouvement de va-et-vient (100) qui est animée par une perceuse, et qui comporte un ensemble d'engrenages de sécurité (300) qui débraye le mécanisme d'entraînement de la scie dès que l'opérateur n'a plus prise sur le carter de la perceuse (110). L'ensemble d'engrenages comporte un arbre d'entraînement moteur (120) raccordé à une perceuse électrique et qui entraîne un arbre de renvoi (155) au moyen d'une paire de pignons en interverrouillage. Au repos, l'arbre d'entraînement est ramené sous charge de ressort (220) en une position selon laquelle les pignons ne sont pas en contact l'un avec l'autre. Lorsque l'opérateur tire le carter de la scie vers la perceuse, le ressort se comprime ce qui provoque l'embrayage des pignons et permet à la scie de fonctionner. Mais si l'opérateur lâche prise sur le carter, le ressort repousse l'arbre d'entraînement dans sa position d'origine, ce qui débraye les pignons.

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