Abstract: A chipping hammer clamping structure for a pneumatic tool includes primarily a grip which is filled in with high-pressure air, an air cylinder which is connected with the grip, a braking unit which is at a front end of the air cylinder, an inner rim of which is a support part and which can move along the air cylinder, and a shield which is sheathed at a rear rim of the air cylinder and is combined with the grip. When in use, as the air cylinder is formed integrally, the chipping hammer can be more robust to increase a striking force. Besides, dust and particles produced in operation are discharged from the groove at the front rim of the shield, thereby avoiding contamination to an operator.

Abstract: An air hammer includes an air hammering mechanism and a vibration suppressing device to absorb the vibration transmitted from the air hammering mechanism. The vibration suppressing device includes a cylinder forming a front channel and a rear channel in communication with each other. First and second air passageways are defined in the cylinder and in communication with the front and rear channels respectively. A valve is movably received in the front channel. The valve defines a bore and third air passageways selectively alignable with the first air passageways. A piston is movably received in the rear channel and forms a projection. A jacket surrounds the cylinder to form therebetween an air chamber that communicates the second air passageways. The jacket has a closed end defining a hole into which the projection is selectively received to block the hole.

Abstract: A passive control system for taking a three dimensional picture comprises a 2D-3D converting device, and a rotary disk apparatus. The 2D-3D converting device at one end thereof connects with a digital picture taking apparatus via a shift interface and at the other end thereof connects with a data processing center. The 2D-3D converting device provides a preset program to regulate the digital picture taking apparatus with a start of scanning at a preset time. The rotary disk apparatus provides a positioning interface to connect with a rotary disk thereof and the rotary disk is able to stay in place after turning a preset angular displace in accordance with the preset program. An object to be taken a picture is placed on the rotary disk and is taken a picture by the digital picture taking apparatus as soon as the rotary disk is turned the preset angular displacement once.