RUBBER DAM WITH MULTI-AIR TUBE

摘要

This rubber dam is composed of multi-separated spaces in which air can be injected or exhausted. The surfaces of the spaces are made of flexible airtight screens these spaces expand when air is injected and vice versa. Water sealed pipes are made in the pipes which are branched from the main pipes to prevent the overpressure. THis water sealed pipe stores water and air and its upper portion is opened into the atmosphere. One end of the branched pipe is opened into the water of the sealed pipe. Another water sealed pipe is sealed up with water and air. One end of another branched pipe from the outside main pipe of this water sealed pipe is opened into the air, and the other end is opened into the water of this sealed pipe.