Untitled record

Application filed March 16,1880. (No model.)

To all whom it may concern:.

Be it known that I, Albien H. Lowell, of Manchester, in the county of Hillsborough and State of New Hampshire, have invented 5 certain new and useful Improvements in SewerGrating, of which the following is a specification.

This invention relates to certain improvements in that class of sewer - traps which are io provided with an elevated grating above the opening, so that it will not become obstructed by small sticks, straws, leaves, and other small rubbish not large enough to clog the sewer or drain with which it may be connected, and at 15 the same time will prevent all matter from passing which is large enough to do injury to said drain.

In such traps as heretofore constructed the grating has been supported upon pins which 20 are permanently fastened to both the trapshell and grating, or the trap - shell has been provided with an annular shoulder, in which an annular support for the grating has been affixed by means of a bayonet or other joint. 25 Both of these forms have been found objectionable in practice, for the reason that in the first-mentioned it is impossible to remove the grating without destroying its supports, while in the last-mentioned, owing to the fast30 ening devices being located in the shell of the trap, directly in the way of the passing water, the grating is liable to be frozen to the shell in winter, rendering it almost impossible to remove said grating, and impracticable to get at 35 the sewer, for cleaning in the case of any stoppage therein.

The object of my invention is to obviate these objections; and to this end it consists in attaching the grating - supports permanently 40 to the trap-shell, and so constructing the grate that it may be removably secured to the upper ends of said supports by means of suitable locking devices, as more fully hereinafter specified.

In the drawings, Figure 1 represents a per. spective view of my invention; Fig. 2, a perspective view of the annulus, and Fig. 3 a view of the grate detached and inverted.

The letter A indicates the shell or rim of the 50 trap, consisting of a cast-metal concavo-convex annulus with the concave side uppermost. This shell, however, may be made square, octagonal, or of any other suitable shape. The letter B represents the grate thereof secured upon the upright supports 0, which are firmly secured 55 to or formed upon the upper concave surface of said annulus. The upper ends of said supports are provided on opposite sides with recesses E, giving the tops of the supports heads or buttons which engage in recesses or button- 60 holes F, formed at suitable points in the under side of the grate B. The recesses F on said grate are formed with a narrow opening, g, terminating at one end in an eye, h, through which the end of the support enters when the 65 grate is placed in position, the sides of the narrow opening serving, when the grate is slightly rotated, to engage the recesses on the ends of the supports, and thus secure the grate in place. 70

The recesses or button-holes for engaging the heads of the grate - supports may be cut directly in the solid rim of the grate, or may be formed by attaching to the under surface of said rim separate plates I, having suitable 75 apertures cut therein, as shown in Fig. 3, said plates bridging cut-away portions of recesses in the rim.

It will be perceived that as thus constructed the locking devices for securing the grate are 80 elevated above the water-passage, and cannot therefore become clogged and fastened by the ice in winter, thus permitting the grate to be readily removed for access to the sewer at all times. 85

It will be obvious that almost any ordinary sewer-trap may be easily adapted to receive my improved grate, it being only necessary to provide a trap-rim with suitable posts or supports having their tops formed to engage with 90 the recesses, button-holes, or other engaging devices with which the under surface of the grate is formed or provided.