| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely and properly exercise a desired locking function to a pair of locking links even when the loosening and mistake in setting of an operating member constituting a stopper means occur. <P>SOLUTION: This branching tube flow channel shielding device comprises a lid body capable of being mounted on a downstream-side end part of a switch valve, a first operation shaft 8 penetrated through the lid body, and a second operation shaft 9 penetrated in the first operation shaft 8. An elastic annular member 12 is mounted between both pressing plates 10, 11 at inner end sides of the operation shafts 8, 9 to shield between an inner peripheral face of a branching pipe and the pressing plates by being elastically deformed in a diameter enlargement state by clamping pressure, and a stopper means D comprising the pair of locking links 13, 14 projecting while bent in a diameter-enlargement attitude in interlocking with the sliding to an outer end side of the second operation shaft 9 to the first operation shaft 8, is mounted between the inner end side of the second operation shaft 9 and the upstream-side pressing plate 11. An inversion preventing means F is mounted to be kept into contact with and restricts an outside buckling attitude where bent pivot parts of the pair of locking links 13, 14 are projected and positioned radially outward, when the pair of locking links 13, 14 of the stopper means D are expanded to a diameter-reduction attitude. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
