121results about How to "Avoid backlash" patented technology

The invention discloses an injection-molded part forming method requiring two stages of core pulling. During mold splitting, a core pulling oil cylinder drives a primary core pulling sliding block slidingly connected with the interior of a secondary core pulling sliding block to slide backwards, and the primary core pulling sliding block then drives a core pulling spindle slidingly connected with the primary core pulling sliding block to move backwards, so that primary core pulling is completed; the core pulling oil cylinder continues to act to pull the secondary core pulling sliding block to move backwards through the primary core pulling sliding block, so that secondary core pulling is completed; then, a product is ejected out of a movable mold; the core pulling oil cylinder acts backwards to allow the primary core pulling sliding block to move forwards, then to drive the core pulling spindle to move forwards and to stretch out of the forming end of the secondary core pulling sliding block; the core pulling oil cylinder continues to act to drive the secondary core pulling sliding block and the core pulling spindle to synchronously move forwards to reset, by this time, injection molding of a next product can begin. With the adoption method, a mould structure can be simplified, lateral core pulling in two any directions on one side of a product can be adapted, and backward movement of the core pulling spindle and the sliding blocks can be avoided.

The invention discloses an internal fixing Kirschner wire for fracture. The Kirschner wire can prevent the rear shaft of the Kirschner wire from retreating, and can also prevent the Kirschner wire from excessively inserting into human body tissues in an axial direction. The internal fixing Kirschner wire for fracture comprises a needle bar and a needle point arranged at the head part of the needle bar, wherein the needle point is in self-tapping needle head design, the needle bar is provided with a limiting part with a threading hole, the lateral size of the limiting part is larger than the diameter of the needle bar, and the tail end of the needle bar is in a triangular prism shape.

The invention relates to a workpiece holding device (D), provided with a transversal rotation axis in relation to the tool downward axis of a machining machine tool (M), with which the device (D) is associated. Said device is characterised in being composed of a frame supporting two bearings for rotational guiding according to said transversal rotation axis, the structure formed by the frame and both bearings being closed by a rotary worktable, the ends of which are removably connected to both rotational guiding bearings which are arranged to take into account axial forces. Said device applies to workpiece holding inside a machining station.