| 摘要 |
PURPOSE:To prevent the lowering of the sealing performance even in the state of deflation at the time of puncture by providing a sectional form with a protrusion protruding from the side of a suction cup main body to an adsorption face in a tube and fitting the sectional form at the suction cup main body through a spring. CONSTITUTION:A tubular vacuum seal 1 is provided with a hollow gum tube 4 fitted at a ring frame 4, and this tube 4 is formed of a thin film made of gum and a protrusion 3 of the entire length of the tube 4 protruding toward the adsorption face 5 within the tube 4. The tubular vacuum seal 1 is fitted at the main body of a suction cup device through a spring 14, provided with a vacuum generating device, and can be adsorbed to the adsorption face 5 by the vacuum space formed by means of the vacuum generating device. In this structure, the protrusion 3 in the tube and the adsorption face 5 are not in contact at the time of normal use, but if the air in the tube 4 is let out and the pressure is decreased due to the generation of a puncture, the spring 14 is stretched and the protrusion 3 in the tube is pressed to the adsorption face 5 so as to prevent the lowering of the sealing performance. |
