| 摘要 |
A plurality of engagement members (20), inserted in a hole in an object to be fixed, which are capable of gripping an inner circumferential surface of the hole are provided, and a wedge face (32) of a clamping rod (15) is engaged on an inner circumference of the engagement member (20) from an upper side. An upper part of a piston rod (55) protruding upward from a piston body (54) of a piston (12) is coupled to a lower part of the clamping rod (15). The engagement member (20), the clamping rod (15), and the piston (12) are provided in a housing (2). An annular valve member (78) is provided between the housing (2) and the piston rod (55). When the piston (12) has moved to a lower-limit region in a lock direction, an actuating portion (89) of the piston rod (55) causes the valve member (78) via an actuated portion (99) of the valve member (78) to be opened downward. |
| 主权项 |
1. A clamp device comprising:
an engagement member (20), inserted in a hole (18) in an object to be fixed (17), which is capable of gripping an inner circumferential surface of the hole (18), the engagement member (20) being constituted by a plurality of engagement members circumferentially provided at predetermined intervals or a monolithic engagement member circumferentially provided in an annular shape; a clamping rod (15) having a wedge part (32) that is engaged on an inner circumference of the engagement member (20) from a top end; a piston (12) that causes the clamping rod (15) to move axially, the piston (12) having a piston rod (55) protruding toward the top end so as to be coupled to the clamping rod (15); and a housing (2) in which the engagement member (20), the clamping rod (15), and the piston (12) are provided, the clamp device further comprising: a supporting mechanism (49) that pushes the engagement member (20) toward the top end with a predetermined force, the supporting mechanism (49) having: a cylindrical supporting member (21) that moves axially together with the engagement member (20); a spring chamber (46) provided on a base end of the supporting member (21); and an advancing spring (47), provided in the spring chamber (46), that biases the supporting member (21) toward the top end, a valve mechanism (76) provided in the housing (2) so as to be actuated by the piston rod (55) or the clamping rod (15), the valve mechanism (76) being opened or closed when the piston (12) has moved to a last-stage stroke region in a lock direction of a total stroke (T) of the piston (12), the clamp device being configured so that pressurized air is able to be supplied to an inlet (86) of the valve mechanism (76), an annular space being formed between a cylinder hole (11) in the housing (2) and the piston rod (55), a valve member (78) of the valve mechanism (76) being formed in a annular shape, the annular valve member (78) being hermetically inserted in the annular space so as to be movable axially, a valve face (81) of the valve member (78) being configured such that an annular end face (84) provided on a base end of a step part (83) of the cylinder hole (11) is contactable for closure by the valve face (81) from the base end, and when the piston (12) has moved to the last-stage stroke region in the lock direction, the valve face (81) being separated by the piston rod (55) or the clamping rod (15) from the annular end face (84) toward the base end to form a gap through which the pressurized air supplied to the inlet (86) of the valve mechanism (76) is discharged toward an outlet (91). |
