Abstract: A pen barrel assembling device includes a base with a first frame and a second frame fixed to the top of two ends of the base. A movable rod extends through the first frame and fixed to the first frame by a first fixing bolt. An end part is connected to the first end of the movable rod and the outer section is positioned in the end part. A push rod extends through the second frame and is movable toward the movable rod by pivoting a lever. The metal section is connected to the free end of the push rod. Multiple blocks are pivotably or slidably connected to the base and each block includes an engaging recess which is removably engaged with the movable rod.

Abstract: A device for welding plastic tubes includes a laterally movable tube holder having tube holding areas and a laterally fixed tube holder having tube holding areas. Each tube holder includes clamping structure for clamping each tube placed in the respective tube holder areas and for creating a fluid free area. A spring mechanism urges the laterally movable tube holder toward the laterally fixed tube holder to maintain the clamp faces flush against each other. A clamp locking mechanism is provided to supplement the action of the spring mechanism by maintaining the clamp faces flush against each other during the loading of the tubes.

Abstract: A hinge positioning apparatus includes a base, a first positioning unit, and a second positioning unit. The first positioning unit includes a load-supporting platform, a first locking mechanism, and a plurality of limiting blocks. The load-supporting platform is mounted on the base. The first locking mechanism is movable between a loose position and a locking position. The limiting blocks respectively mounted on the load-supporting platform and the first locking mechanism. The second positioning unit includes two coaxial supports and two second locking mechanism. The supports are mounted on the base adjacent the load-supporting platform, each defines a positioning groove in side surface facing the load-supporting platform. The second locking mechanism are mounted on the supports respectively, configured for maintaining hinges in the positioning grooves. The apparatus is used to position two hinges coaxially on an enclosure of a notebook computer.