US575475A

US575475A - fuller

Info

Publication number: US575475A
Authority: US
Publication date: 1897-01-19
Anticipated expiration: 1914-01-19

Description

(No Model.)

H. P. FULLER.

MANHOLE COVER SEATING. No. 575,475. Patented Jam. 1-9, 1897.

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HENRY F. FULLER, OF CHICAGO, ILLINOIS, ASSIGN OR TO TIIE IVALMSLEY, FULLER dr COMPANY, OF SAME PLACE.

IVIANHOLE-COVER SEATING.

SPECIFICATION forming part of' `Letters Patent No. 575,475, dated January 19, 1897. Application tiled November 2, 1896. Serial No. 610,853. (No model.)

To au whom t may concern.-

Beit known that I, HENRY F. FULLER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented a new and useful Improvement in Manhole-Cover Seating, of which the following is a specification.

My invention relates to an improvement in the construction of the packed junction be- 1o tween the cover of a manhole and the seat about the latter for the cover.

The object of my improvement is to secure a perfectly air and gas tight closure of a manhole by its cover without employing elaborate or unduly cumbersome mechanism for the purpose. To this end I provide about the manhole a transversely-concave annular seat, the concavity being described on a circle of 4one radius to receive the packing, and Iform 2o the flange about the cover transversely conveX, with the conveXity described on a circle of greater radius. Thus with the packingrin g in place whenthe cover is fastened down its iiange bears mainly against the opposite z 5 edges of the packing-ring, thereby compacting the packing and accordingly tightening the joint, and should there be any moisture in the cup-shaped seat the tendency will be to confine it and thus compact the packing 3o the more, besides securing the sealing effect of the water.

My invention is illustrated in the accompanying drawings, in whicl1- Figure l shows a broken section of a gas- 3 5 generator equipped with illy-improvement, and Fig. 2 is a section taken at the line 2 on Fig. 1, viewed in the direction ofl the arrow and enlarged.

A is a manhole, shown to be provided in 4o the top of the inner tank B of a gas-generator, though it may be equipped with my improvement in any other situation in which it may be provided. 4

C is the bushing, shown to be riveted in place and provided in its horizontal portion with the transversely-concave annular seat i' for the gasket D, which may be formed of rubber, though a liquid packing may be used.

E is the manhole-cover, of any suitable general form, provided with the perpendicular 5o annular iiange p, to fit inside the bushing and having the outward-extending flange o transversely convex on its under side, the convexity being formed on a circle of greater radius than that on which the concave seat?1 55 is formed.

Then the cover E is tightened and held down in place, as by the clamping-bar arrangement F illustrated, which is a wellknown device for the purpose and therefore 6o requires no detailed description herein, the convex flange o bears against the opposite edges of the gasket, thereby compacting it toward its center and accordingly tightening the joint, and any water that may be contained in the annular concavity r affording the gasket-seat will be crowded against the central portion of the underside of the gasket and tend to increase the hermetical quality of the junction by affording a water-seal.. 7o

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a manhole, an an nular transversely-concave packing-seat, a cover having an annular iiange the under side of which is of slight transverse conveXity as compared with the degree of' concavity of the seat, forming with said seat a concavoconvex recess, and an elastic packing within said recess adapted by pressure to conform 8o thereto and to be centrally' compressed in the manner and for the purpose.substantially as described.

2. In combination with amanhole, an annular transversely-concave packing-seat hav 8 5 ing its concavity formed on a circle of one radius, an elastic packing in said seat, and a cover having a flange transversely convex on its under side on a circle of greater radius, whereby its pressure upon the elastic pack- 9o ing will cause the saine to be compacted toward its center, substantially as described.

p HENRY F. FULLER.

Inpresence of J. H. LEE, R. T. SPENCER.