Abstract: A cylinder mechanism includes a cylinder body, a piston pole slidably installed to the cylinder body, a connecting member mounted to the piston pole away from the cylinder body, and an adjusting apparatus. The cylinder body includes two tabs protruding out from two side surfaces of the cylinder body. Each tab defines a guiding hole extending along a moving direction of the piston pole. The adjusting apparatus includes two screws and two adjusting nuts fitting about the two screws. A first end of each screw is mounted to the connecting member, and a second end of each screw is passed through the corresponding guiding hole. Each adjusting nut is connected to the second end of the corresponding screw, and the adjusting nut is configured to abut against the corresponding tab. The stroke of the piston pole is configured to adjust according as rotating the adjusting nuts.

Abstract: A cylinder mechanism includes a cylinder body, a piston pole slidably installed to the cylinder body, a connecting member mounted to the piston pole away from the cylinder body, and an adjusting apparatus. The cylinder body includes two tabs protruding out from two side surfaces of the cylinder body. Each tab defines a guiding hole extending along a moving direction of the piston pole. The adjusting apparatus includes two screws and two adjusting nuts fitting about the two screws. A first end of each screw is mounted to the connecting member, and a second end of each screw is passed through the corresponding guiding hole. Each adjusting nut is connected to the second end of the corresponding screw, and the adjusting nut is configured to abut against the corresponding tab. The stroke of the piston pole is configured to adjust according as rotating the adjusting nuts.

Abstract: A component holder for a component includes a bracket and two fixing members. The bracket includes a bottom plate and a frame including a number of first side plates and two second side plates perpendicularly to each other. The first side plates and the second side plates are attached to the bottom plate to form a receiving space for receiving the component. The two fixing members are coupled to the two second side plates. Each fixing member includes an elastic board extending into the receiving space and spaced from the corresponding second side plate, to press against the component in a direction perpendicular to the corresponding second side plate.

Abstract: A rotatable assembly includes a base, a supporting member, a sliding member, and a rotatable member. The supporting member substantially perpendicularly protrudes from the base. The sliding member includes a sliding bar and a rack. The sliding bar is slidably connected to the base and passes through the supporting member. The rack is fixed to the surface of the sliding bar. The rotatable member includes a gear, a shaft, and a platform. The gear engages with the rack. The shaft passes through the supporting member to rotatably connect to the supporting member. The shaft is fixed in a hollow of the gear and is fixed to the platform. The platform arranges an electronic device thereon.