HOLLOW-FORMING CORES Russian patent published in 1995 - IPC

FIELD: building engineering. SUBSTANCE: device has a cone-shaped housing with a bar passed through the hole in the mold and having a prop at a given distance from the back side of the mold wall. The prop represents itself a bulge of the bar or a separate member shifting along the bar. The housing is pressed to the form by a spring located beyond it and fixed by one side on the free end of the bar. The other side is fixed on the mold. The second end of the bar is rigidly connected with the mold. The prop is mounted on the bar for regulating its distance to the exterior wall of the mold. EFFECT: facilitated manufacture. 4 dwg