Patent ID: 6736384
Filing Date: 2004-05-18
Classification: B23Q,B25B

Abstract:
A device for detecting operation of a clamp, the device comprising:a housing (3) having one end wall (3b); a clamp rod (5) having one end portion and axially movably inserted into the housing (3); a detecting hole (58) having a peripheral surface and formed in the one end wall (3b) of the housing (3) substantially concentrically with the clamp rod (5); at least one inlet hole (71, 72) supplying pressurized fluid to the detecting hole (58) and having an opening portion (71a, 72a) provided by opening the peripheral surface of the detecting hole (58); a detecting member (62) having an outer peripheral surface and axially movably fitted into the detecting hole (58), the detecting member (62) having the outer peripheral surface provided with a closing surface (68) which closes the opening portion (71a, 72a) and with a recess (69) which communicates the opening portion (71a, 72a) with the outside air; and an actuation portion (5a) provided at the one end portion of the clamp rod (5), the actuation portion (5a) being connected to the detecting member (62) 50 that it makes a relative movement radially.