Patent ID: 7351049
Filing Date: 2008-04-01
Classification: B29C

Abstract:
1. Circulating lubrication oil passage structure of a toggle mechanism of an injection molding machine, said toggle mechanism consisting of: (a) an upper toggle assembly, the upper toggle assembly being pivoted to a fixed tail support of an injection molding machine at a first end, and a movable mold support of the injection molding machine at a second end; the upper toggle assembly having: a plurality of toggles pivoted together, each of the toggles having pivotal holes on two ends thereof; first pivotal rods passed through corresponding pivotal holes of the toggles to pivot the toggles together; a second pivotal rod passed through one said pivotal hole and connected to the fixed tail support of the injection molding machine so as to pivot the upper toggle assembly to the fixed tail support; a third pivotal rod passed through one said pivotal hole and connected to the movable mold support of the injection molding machine so as to pivot the upper toggle assembly to the movable mold support; each of the pivotal rods having oil holes in both radial and axial directions, which communicate with each other; the radial oil holes communicating with the axial oil holes and the pivotal holes of the toggles; each of the toggles having an internal oil passage communicating with both the pivotal holes thereof; sleeves positioned in the pivotal holes of the toggles and around the pivotal rods, the sleeves having a plurality of oil holes thereon, which communicates with the internal oil passages of the toggles; (b) a lower toggle assembly, the lower toggle assembly being pivoted to the fixed tail support at a first end, and the movable mold support at a second end thereof; the lower toggle assembly having: a plurality of toggles pivoted together, each of the toggles having pivotal holes on two ends thereof; first pivotal rods passed through corresponding pivotal holes of the toggles to pivot the toggles together; a second pivotal rod passed through one said pivotal hole and connected to the fixed tail support so as to pivot the lower toggle assembly to the fixed tail support; a third pivotal rod passed through one said pivotal hole and connected to the movable mold support so as to pivot the lower toggle assembly to the movable mold support; each of the pivotal rods having oil holes in both radial and axial directions; the radial oil holes communicating with the axial oil holes and the pivotal holes of the toggles; each of the toggles having an internal oil passage communicating with both the pivotal holes; sleeves positioned in the pivotal holes of the toggles and around the pivotal rods, the sleeves having a plurality of oil holes thereon, which communicates with the internal oil passages of the toggles; and (c) an oil conduit, the oil conduit being connected to the oil holes of the third pivotal rods of the upper and the lower toggle assemblies at two ends thereof; the second pivotal rod of the upper toggle assembly being used as a lubricating oil inlet of the circulating lubrication oil passage; the second pivotal rod of the lower toggle assembly being used as a lubricating oil outlet.