| CPC B23Q 3/108 (2013.01) [F15B 15/1447 (2013.01)] | 4 Claims |
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1. A work support comprising:
a support rod (3) inserted in an insertion hole (2) provided through a leading end portion of a housing (1), the support rod (3) being configured to be movable in the housing (1) toward a leading end side and toward a base end side in an axial direction of the support rod (3);
a collet (5) fitted over an outer peripheral wall of the support rod (3);
a piston (12) inserted in the housing (1) so as to be movable in the axial direction, the piston (12) being configured to be actuated by compressed gas supplied to an actuation chamber (13) to drive the support rod (3) for locking via the collet (5);
an output member (24) inserted in a cylinder hole (22) provided in a base end portion of the housing (1) so as to be movable in the axial direction;
a biasing means configured to bias the support rod (3) and the output member (24) so that the support rod (3) and the output member (24) recede from each other;
an inlet chamber (29) provided in the cylinder hole (22) and on the base end side in the axial direction relative to the output member (24);
an outlet chamber (32) provided in the cylinder hole (22) and on the leading end side in the axial direction relative to the output member (24);
a switching means (40) structured by a communication hole (41) opening onto a peripheral wall surface of the cylinder hole (22) and by an outer peripheral surface of the output member (24), the switching means (40) being configured to switch, through movement of the outer peripheral surface of the output member (24) across the communication hole (41), between a state in which the actuation chamber (13) is communicatively connected to the inlet chamber (29) via the communication hole (41) and a state in which the actuation chamber (13) is communicatively connected to the outlet chamber (32) via the communication hole (41); and
a discharge passage (42) including an annular space (2a), created between the insertion hole (2) and the support rod (3), and a discharge port (42a) provided at the leading end portion of the housing (1), the discharge passage (42) being configured so that compressed gas in the outlet chamber (32) is discharged through the annular space (2a) to an outside of the housing (1) from the discharge port (42a), wherein
the work support is designed so that an amount of compressed gas pushed out of the outlet chamber (32) by the output member (24) when the output member (24) moves from a base-end-side limit position of the output member (24) to a leading-end-side limit position of the output member (24) in the axial direction is larger than a capacity of an accommodation chamber (45) created on the base end side relative to the support rod (3) due to movement of the support rod (3) from base-end-side limit position of the support rod (3) to a leading-end-side position of the support rod (3).
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