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11,695 · Hyatt · "Vault-Light" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

11,695: 2 of 3

such a vault cover, as to the profit of the maker thereof. Hence it is apparent that the upper face of the glass must not be below the general surface of the vault cover, nor must it be covered by any metal plate or grating having interstices to hold the dirt from which it cannot be swept as readily as from any other part of the cover.     10. A glass like that described 1st in paragraph 6, if protected by a covering plate, must have one in the form of a grate all of whose bars run parallel to each other, there being no cross bars. The space inclosed within the grate frame must be unobstructed by the bars, which instead of cross through it, must cross above it, and consequently the ends of the bars must be lapped on to the upper side of the grate frame, as may be seen by reference to the grating. By this arrangement of the parts the grate frame instead of surrounding its bars, incloses the glass, so that the upper face of the glass rises up to the same level with the face of the vault cover, the bars of the grating being above it as well as above the grate frame to which it is attached as aforesaid.     11. The second form of glass mentioned in paragraph (P) 6, is adapted to a grating made in the usual manner, with or without cross bars. In this case the grate bars sink into the channels in the upper face of the glass, the projecting portions of the glass, projecting portions of the glass whether in the form of ridges or knobs, rising up into the spaces between the grate bars, and filling them to the exclusion of dirt, snow, ice, &c.     12. The 3d form of glass described in paragraph (P) 6 consists of a double layer of glass for greater security against accident, so that if the upper one should get broken out, a dangerous hole may not be exposed in the interval of its repair. The glasses are set in the vault cover in the manner above described. The upper glass may consist of one or many, the arrangement of which from what has already been said, will be readily understood by reference to the drawing accompanying and to the description thereof below. India rubber or other suitable material may be introduced between the layers of glass.     13. Referring to the annexed drawing making part of this specification, Figure 1 is a top view--Fig. 2 is a reverse view thereof--Fig.3, a transverse section of the same through the line x, x, Fig. 4, is a transverse section similar to Fig. 3, but showing a double layer of glass as above described; the upper layer being composed of a number of small glasses or knobs like the protuberances on the glass described "secondly" in paragraph 6. Figs. 5, 6 and 7 show a glass as describe 1st in paragraph 6, in combination with a grating as described in paragraph 10.

Similar letters correspond to each other in all the figures.     A, A, is the metal frame forming the main portion of the vault cover, in which the glass C and the grating B', B', B, B, B rest, each in a rabbet as seen at a, a, b, b, Figs. 3 and 4.     D Figs. 3 and 4, is the central opening in the metal frame. A, A, occupied by the glass C. d-- d-- Figs 3. and 4 is a space about the edges of the glass which is filled in with putty to make a water tight joint.     c' c' c' c' represent the knobs of glass alluded to in paragraph 6. Fig. 3 shows them as the result of channels sunk in the face of the glass plate C. Fig. 4 shows them separate from the glass plate C and forming a layer above it as described "3dly" in paragraph (P) 6.     B' B' seen in all the figures except 2 (most distinctly at 5) shows the grating mentioned at "3d" in paragraph 5. The small capitals B, B, B, B, B, show the bars of the grating while the two large capitals B' B' indicate more particularly the frame of the grating to which the bars are attached.     Fig. 6 is a cross section of Fig. 5 at x--x. Fig. 7 is a cross section of Fig. 5 at x'--x'. These transverse sections illustrate paragraph (P) 10.     Figs. 3 and 4 illustrate paragraph 11, showing in Fig. 3 the channels in the face of the glass C into which the bars B, B, B, B, B of the grating B' B' sink and between the spaces of which bars the knobs c' c' c' c' on the glass C rise to the level of the main cover, where they are slightly convex, the convexity being that much higher than the main level of the cover. Fig. 4 showing the same principle but the knobs being independent of the plate C but resting as a layer upon it.     a, a, b, b, in Figs. 3 and 4 illustrate paragraph 7, showing the rabbets in the metal frame A, A.     Having thus fully described the nature of my improvements, what I claim and desire to secure by Letters Patent, is--     The making a vault cover by the union of two metal pieces, of which, one is formed as a grating, and the other is formed with an opening whose area is at least equal to the combined area of all the openings in the grating; (the area of the one being covered over by the grate-bars of the other) in combination with a glass or layers of glass protecting by the grating, and covering the opening of the metal frame in which they are set substantially in the manner and for the purposes above described. THADDEUS HYATT. Witnesses:     MORGAN CARR,     CYRUS H. SONTREL