Patent ID: 6619646
Filing Date: 2003-09-16
Classification: B23Q,B25B

Abstract:
A clamping apparatus comprising:a housing (4) having an axis; an annular driving member (11) having a tubular bore (11a) and inserted into the housing (4) axially movably; a driven rod (6) having a portion near a first end and inserted into the tubular bore (11a); an input portion (6a) provided at the portion near the first end of the driven rod (6); a plurality of transmission members (15) each having a portion near a first end and a portion close to a second end, and arranged peripherally side by side around the input portion (6a); each transmission member (15) having a fulcrum portion (16) located near the first end thereof and swingably supported by the housing; an engaging portion (17) provided at the portion close to the second end of each of the transmission members (15) so as to engage with the input portion (6a); the transmission members (15) being able to switch over by the fulcrum portion (16) between an engageable position (X) where the engaging portions (17) axially face the input portion (6a) when the transmission members (15) swing radially inwards and a disengaging position (Y) where the facing is cancelled when they swing radially outwards, the transmission members (15) at the engageable position (X) being movable toward the first end through the driving member (11); a first actuation means (26) swinging the transmission members (15) from the disengaging position (Y) to the engageable position (X); and a second actuation means (32) swinging the transmission members (15) from the engageable position (X) to the disengaging position (Y).