APPARATUS FOR CORRUGATING SHEET MATERIAL Russian patent published in 2003 - IPC

FIELD: equipment for corrugating sheet materials by bending. SUBSTANCE: apparatus includes housing mounted on base and having upper movable part and stationary lower part; mechanism for lifting upper part; gas- tight cloth. Systems of upper and lower punches are arranged inside housing; each system includes identical flat shaping members in the form of parallelograms jointly connected one with another at their sides. Drive unit of punch systems is in the form of two sealed chambers into which excess pressure may be supplied. Each chamber is formed by means of systems of respective punches joined by means of gas-tight elastic cloth along perimeter with respective part of housing. Cavity between punch systems is communicated with atmosphere and forms shaping zone. EFFECT: enhanced reliability and efficiency, simplified design and enlarged manufacturing possibilities of apparatus. 10 dwg