| 摘要 |
947,005. Valves. C. B. REECE, T. R. KING, and C. V. SCHLINGMAN, [trading as R.I.N.C.O.]. Jan. 30, 1962 [Jan. 30, 1961], No. 3407/62. Heading F2V. A damper having a butterfly closure 38, Fig. 2, is housed in a fluid duct 36 by a cylindrical member 14 embodying an external collar 16 and an inner cylindrical part 19 with a raised portion 20 forming a circular recess 22 defined by walls 24, 26. The damper is secured to the duct by screws 30, and a layer of insulation 34 is interposed between the collar 16 and the duct with a weatherproof skin 36 glued to the under side of the collar 16. The closure 38 is mounted on a rectangular rod 40 terminating in a hollow shaft 42 incorporating a locking element 46, with a pair of opposed fingers 48, housed in the recess 22; the shaft 42, which extends through the wall 24 to the space within the member 14, is provided with an operating handle 50. A spring 52 encircles the shaft, and urges the latter to a position where the element 46 abuts the wall 24. The rod 40 passes through a hole 54 in the element 46 into the interior of the shaft 42, the latter being capable of axial movement relative to the rod 40. The shaft 4 instead of the element 46 may be in sliding contact with the rod 40. Upon moving the handle 50 inwardly to compress the spring 52 the fingers 48 of element 46 are disengaged from raised projections which encircle the wall 24 whereupon the closure may be rotated to a new position; when the handle is released the fingers will engage with different projections to again lock the closure. In another form, the projections extend 180 degrees around the wall 24 and the locking element is radial with one arm and one finger only. In another form, for non-insulated ducts, the closure is supported by a body 58, Fig. 7, with an external recess 60. A rectangular shaft 62 is secured to locking element 64 held against the bottom of the recess 60 by a flat spring 66, the central part of which engages the inner face of a handle 68. U.S.A. Specification 2,966,169 is referred to. |
