Abstract: A cylinder mechanism includes a cylinder body assembly, a piston assembly, and a grasping assembly. The cylinder body assembly includes a cylinder body. The cylinder body defines a receiving cavity, a first gas hole, and a second gas hole. The first and second gas holes communicate with the receiving cavity. The piston assembly includes a piston movably received in the receiving cavity, a guiding shaft movably received in the receiving cavity, and a limiting member. A first end of the guiding shaft is fixed to the piston, and a second end defines a receiving groove. A pair of guiding hole is defined in the guiding shaft. The grasping assembly includes a pushing member movably received in the guiding shaft, a pin received through the guiding holes, and a latching member movably received in the guiding shaft and capable of protruding outward.

Abstract: An exemplary contour measuring probe (10) includes a tip extension (16) and two driving members (13). The tip extension is configured for touching a surface of an object. The driving members are configured for driving the tip extension linearly moving along a first direction. The driving members are tapered and a diameter of each driving member increases along the first direction. The driving members are driven to move by gas pressure acting on an outer side surface thereof.

Abstract: An exemplary contour measuring probe (10) includes a tip extension (16) and two driving members (13). The tip extension is configured for touching a surface of an object. The driving members are configured for driving the tip extension linearly moving along a first direction. The driving members are tapered and a diameter of each driving member increases along the first direction. The driving members are driven to move by gas pressure acting on an outer side surface thereof.