| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fluid pipe line changeover device used for an endoscope, and preventing packings from being damaged by preventing the packings from coming into contact with connection holes formed in a cylinder when mounting/dismounting a piston. <P>SOLUTION: The fluid pipe line changeover device includes: a button 68 having the piston 76, and a plurality of seal members 82; the cylinder 72 whose diameter is stepwise reduced to the insertion direction of the piston and which is formed with the connection holes connected with fluid pipe lines in the side face thereof; and a stopper for prescribing the lower end position of the piston. The plurality of seal members stepwise become thin toward the tip side, and separate the inside of the cylinder in the axial direction. The diameter of each seal member is smaller than the inside diameter of a stage above a stage which the seal member slidingly contacts, of the piston. Each position of the connection hole for connecting each fluid pipe line and the cylinder is positioned on the tip side as compared with the lower end position of the seal member slidingly contacting the corresponding stage. <P>COPYRIGHT: (C)2013,JPO&INPIT |
