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Patents: 266 of 530	UNITED STATES PATENT OFFICE. JAMES JENKINSON, OF BROOKLYN, ASSIGNOR TO JACOB MARK, OF NEW YORK, N. Y.
VAULT OR SKYLIGHT COVER. SPECIFICATION forming part of Letter Patent No. 501,720, dated July 18, 1893. Application filed January 3, 1893. Serial No. 457,090. (No model.)

To all whom it may concern:     Be it known that I, JAMES JENKINSON, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Vault or Skylight Covers, of which the following is a specification.     This invention relates to vault or skylight covers, pavement plates, roofs, &c., having the lenses embedded in putty, asphalt or other similar material, opposite to holes in the supporting plate or grating.     Prior to my invention it has been customary to put all the lenses in a cast iron frame filled with a single or continuous layer of putty or asphalt and hence if the material should crack or heave as by the action of the frost, the whole or a great portion of the series of lenses are thereby effected in their position and it is necessary to remove a corresponding portion of the asphalt for its replacement by fresh material. This is a serious objection to the old method of constructing the frames and arranging the lenses, and to overcome such is the object of my invention which consists in constructing the supporting frame or grating of a series of corrugated sheet metal troughs or ribs formed with feet thereon, a series of cell openings in their tops and placing the lenses in the cell openings respectively, they being embedded in putty or asphalt so that each series of lens holding troughs or corrugated ribs with its putty supporting layer is independent, and adapted to be removed, as for repair, &c., without disturbing the remainder of the corrugated troughs or ribs; and it consists further in the sheet metal cover provided with sight openings having their edges contiguous to the lenses inclined upward in their manufacture to prevent the water from entering the lens openings; and furthermore in the transverse strengthening braces provided with feet whereby they are bolted to the corrugated sheet metal troughs or ribs as hereinafter more fully set forth.     This invention is illustrated in the accompanying drawings in which--     Figure 1 represents a plan or top view. Fig. 2 represents an inverted plan or bottom

view. Fig. 3 represents a partial horizontal cross section on a larger scale. Fig. 4 represents a longitudinal view of one of the corrugated troughs or, ribs detached. Fig. 5 is an end view thereof. Fig. 6 represents my invention in curve for skylights, &c. Fig. 7 represents a partial side view of the end brace. Fig. 8 represents an end view of the middle brace. Fig. 9 represents an end view of the end brace.     Similar letters of reference indicate corresponding parts.     The letter A designates the frame to which the vault or skylight cover B is united by hinges a a.     The letter C indicates the sheet metal cover tapering at its edges and having any desired size, shape or thickness and provided with a series of light openings c c having their edges b contiguous to the lenses D inclined upward in their manufacture to prevent water from entering the lens openings as shown in Figs. 1, 3, and 6.     In the drawings the letter E marks the corrugated sheet metal troughs or ribs which in the present instance are five in number and are constructed of a single piece of material. These corrugated sheet metal troughs or ribs E are of an approximately U-shape in cross section having strengthening lips e, f, formed on their sides and ends by which they are joined by rivets g to the cover C, and light openings E' in their lower parts to coincide with the light openings c c in the sheet metal cover C. The interior of each of the corrugated sheet metal troughs or ribs E is made larger than the diameter of the lenses F to leave room around the latter for the reception of the putty or asphalt H or its substitute. By constructing the corrugated sheet metal troughs or ribs E of the U-shape, with the lips e, f, they are very materially strengthened and moreover afford a ready means of uniting them to the cover C by rivets g or otherwise.     The letter G indicates the middle cross brace and G' G'' the end cross braces which are constructed of sheet metal and taper on their lower portions h from end to end. The middle brace G is provided on its upper portions with T-shaped feet h' to receive rivets g to bolt them to the lips e f of the corrugated