Sealing drill resistance testing equipment so that wood can be tested under water by generating internal pressure equal to measured outside pressure

摘要

The drill device has only one opening through which the drill tool can pass in and out while turning or when stationary. Inside the drill device, an increased gas pressure is generated which corresponds to the measured outside pressure, so that no water can penetrate inside. The opening is sealed by a combination of O-rings, plastics or metal rings.