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336,171 · Struck · "Vault-Light" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

336,171: 2 of 3

within the plate or other cover or wall A a suitable cement is applied around the margin of the appropriate hole in said plate, as seen at L in Fig. 1, after which act the cup is fitted in said opening, thereby causing the collar D to bed itself in the plastic coating just referred to. A thin coating of red-lead is then applied to the inner surface of the cup, as seen at M in Fig. 6, and the prism H is at once inserted in said cup, being of course introduced from the bottom of the same. The locking-piece I is now applied to the cup in such a manner as to cause the flanges F of the latter to enter the sockets J of the former, and said piece I being then turned in the proper direction the inclined flanges K of the locking-piece engage with the aforesaid flanges F. Now, as the upper surface of the locking-piece bears directly against the under side of the plate A, it is evident this turning of said piece causes its inclined flanges K to have a screwing or wedge action against the flanges F of the cup. Consequently this application of the locking-piece forces the prism H tightly into the cup C and clamps the latter immovably to the plate A, said piece I serving to strengthen the latter around the margin of the hole B.     The above is a description of the preferred construction of my prism-holder; but it is evident the details of the same may be varied-- as, for example, the corrugations of the rim D, instead of being concentric, as seen at E in Fig. 1, may be arranged to cross said rim, as represented at E' in the same illustration; but the corrugations may be omitted, and upwardly-projecting spurs be substituted therefor, as seen at E' in Fig. 6. Again, in Fig. 2 the metal directly under the flanges K of the locking-piece has been removed at N for the purpose of reducing weight, but in Figs. 4, 5, 6, and 7 said piece is shown solid.     Fig. 8 shows another modification of my invention, in which the flanges F' of the cup project inwardly instead of outwardly, and

are adapted to engage with the flanges K' of the locking-piece I. (Seen in Fig. 9.) In addition to these outwardly-projecting flanges K', said locking-piece has wings O, terminating with vertical extensions P, adapted to bear either against the under side of plate A or against a washer, R, interposed between said plate and extensions, as seen in Fig. 10. This form of holder necessitates the prism H being inserted from the top of the cup C and being retained in place by a suitable cement, M'. Furthermore, the dotted lines seen in this illustration indicate that the prism H may be prolonged so as to project down through the opening of the ring-shaped locking-piece. Finally, the prism may be polygonal, as indicated by the dotted lines H' in Fig. 1.     I claim as my invention--     1. A holder for prisms, bull's-eyes, and other lights, which holder consists of a cup and a detachable locking-piece united by a set of interlocking flanges, which locking-piece serves as a bearing for the lower margin of the prism, substantially as described.     2. The combination, in a holder for prisms, &c., of the cup C, having flanges F, and the detachable locking-piece I, having sockets J and inclined flanges K, whereby the said holder is clamped to the vault-cover and a bearing afforded for the margin of the prism, as herein described.     3. The cup C, having a rim, D, outwardly-projecting flanges F, and an annular enlargement, G, the bore or opening of said cup being of greater diameter at bottom than at top for the twofold purpose of clamping the holder in place and securing the prism within said holder, as herein described.     In testimony whereof I affix my signature in presence of two witnesses. HENRY F. STRUCK. Witnesses:     JAMES H. LAYMAN,     S. S. CARPENTER.