Pulse tool

Details Pulse tool Pulse tool

B - Operations, Transporting

23

Q

B23Q 5/06 (2006.01) B25B 21/02 (2006.01)

Patent

CA 2193728

The invention is an impulse wrench (1) that employs a fluid coupling between its anvil (53) and hammer members. The tool (1) includes a pulse cylinder (45) that forms the tool's hammer and has a shaped inner surface (82) that defines a side wall of fluid-filled chamber (81). An end portion of the anvil (53) is received within the chamber (81) and includes two retractable vanes (70) that sweep the pulse cylinder's inner surface (82) when the pulse cylinder (45) is rotating about the anvil (53). To achieve only a single impact per revolution of the pulse cylinder (45), fluid bypass channels (94, 97) are employed to intermittently allow fluid to pass around the vanes (70). In addition, the tool (1) including a unique torque-sensing shut-off mechanism (110) that is engaged to the tool's motor (30) and makes use of inertia force to actuate a power shut-off device (120).

Clef à chocs (1) utilisant un accouplement fluide entre son marteau et son percuteur (53) et comprenant un cylindre impulseur (45), formant le marteau, dont la surface intérieure façonnée (82) constitue la paroi latérale d'une chambre (81) remplie de fluide. L'une des extrémités du percuteur (53) qui pénètre dans la chambre (81) comporte deux soupapes rétractables (90) qui balayent la surface intérieure (82) de l'impulseur lorsque ce dernier tourne autour du percuteur (53). Pour ne produire qu'un seul impact par tour d'impulseur (45), des dérivations (94, 97) permettent au fluide de contourner par intermittence les soupapes (70). La clef (1) comporte de plus un mécanisme d'arrêt spécial (110) à capteur de couple, qui est en prise avec le moteur (30) de l'appareil et qui utilise la force d'inertie pour actionner un dispositif (120) de coupure de l'alimentation.

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