摘要:
A table tennis ball service machine includes a ball-collecting unit, a control valve and a ball service mechanism. The ball-collecting unit has a ball-collecting groove connected with ping pong table and having its rear side provided with a blocking net and its lower side connected with a ball-collecting tube and a ball-feeding tube. The control valve is positioned at the lower end of the ball-collecting tube for controlling dropping of balls. The ball service mechanism connected with the upper side of the ball-feeding tube includes a ball service tube, a blower, a support frame, a universal joint, a cam and a motor. The ball serving tube has its outer end extending through the blocking net and formed with an outlet and its rear side formed with an inlet communicating with the ball-feeding tube. Thus, the ball serving speed and the angle can be controlled.
摘要:
A lock core preventable to be pried unlocked includes a disguised lock core provided in front of a real lock core and bored with a key slot. When a burglar attempts to unlock the lock, he will insert a universal key into the key slot of the disguised lock core, trying to release the lock rod in the common lock core. Since the keyhole of the common lock core is not aligned to the key slot of the disguised lock core, the universal key can only be inserted in the key slot of the disguised lock core, impossible to reach in the keyhole of the real lock core. Thus, despise being turned around, the universal key can only make the disguised lock core rotate idly, with the real lock core still locked, having an excellent effect of anti-burglary.
摘要:
The present invention relates to a method and an auxiliary device for precision positioning of welded type nozzles. The auxiliary device for precision positioning of welded type nozzles includes a plurality of alignment tips and an alignment bar. Each alignment tip is connected to a welding adapter and extends a distance. The alignment bar is combined with the alignment tips so that first positioning portions of the alignment tips are aligned with a plurality of second positioning portions of the alignment bar, and after the alignment bar is combined with the alignment tips, a correction distance between an end surface of the alignment bar and a center line of a main pipe header in a longitudinal direction is larger than a length of an assembled nozzle after a nozzle tip is combined with the corresponding welding adapter. In this way, the geometric positions of the nozzles can be accurately corrected.
摘要:
A motorbike lock includes a cylindrical body, two limit discs, two springs, a retainer, a core, a press button, a sleeve, a cap and a shackle. When the pressure button is pushed inward, the retainer is moved to force the core push the limit discs to compress the spring, with the stopper of one shackle end stopped in the cylindrical body. Then the pin in the retainer inserts in an insert hole of the cylindrical body to secure the retainer immovable, finishing locking of the lock. When the key is inserted through the press button and in the core and rotated, the pin is pressed inward to separate from the insert hole of the cylindrical body, with the retainer no longer kept immovable by the pin, letting the spring recover its elasticity to push the retainer back, with the stopper of the shackle end becoming free and the lock unlocked.