Patent ID: 8186649

Claim:
A female coupling member comprising: a tubular housing having one end for receiving a male coupling member and an other end to be communicated with a fluid source; a first locking member attached to the housing and displaceable between a locking position where the first locking member engages with the male coupling member inserted from the one end of the housing to connect the male coupling member to the housing and an unlocking position where the first locking member disengages from the male coupling member to disconnect the male coupling member from the housing; a holding member displaceable between a holding position where the holding member holds the first locking member in the unlocking position and a displacement allowing position where the holding member is displaced by the male coupling member inserted into the housing to allow the first locking member to be displaced to the locking position; a pressing member attached to the housing and displaceable between a standby position where the pressing member allows the first locking member to assume the unlocking position and a pressing position where the pressing member presses the locking member in the locking position in response to the holding member being displaced to the displacement allowing position; a valve member displaceable between an open position where the valve member opens a fluid passage in the housing that is communicated with the male coupling member inserted into the housing and a closing position where the valve member closes the fluid passage, the valve member being displaced to the open position by a pressure in the fluid passage in the housing; and a second locking member provided between the valve member and pressing member and displaceable between a first position and a second position, wherein, when the housing is communicated with the fluid source with the pressing member placed in the standby position, the second locking member is displaced from the first position toward the second position by the valve member displaced toward the open position by fluid pressure but prevented from reaching the second position by engaging with the pressing member before the valve member reaches the open position, thereby preventing the valve member from reaching the open position and also preventing the pressing member from being displaced to the pressing position, and when the housing is communicated with the fluid source with the pressing member placed in the pressing position, the second locking member is displaced from the first position to the second position without engaging with the pressing member, thereby allowing the valve member to be displaced to the open position.