US 390595 A
Description (OCR text may contain errors)
MAN. HOLE COVER.
N4 PETERS. vrmao-unmgmpnw, walhingwn, n, c,
NITED STATES WILLIAM HEISER, OF BUFFALO, NEW YORK.
SPECIFICATION forming part of Letters Patent No. 390,595, dated October 2, 188B.'
(No mod rl.)
To all whom it may concern:
Beit known that I, WILLIAM HEIsER, of the city of Buffalo, in the county of Erie and State ofNew York, have invented a new and useful Improvement in Man-Hole Covers, of which the following` is a specification.
This invention relates to the hinged covers which are applied to manholes of storage vats or tanks used iu breweries and other establishments.
The object of my invention is to provide the hinged cover with a straight and rigid seat .which will form a tight joint, and which will rmly retain in place the ends of the staves around the manhole.
The invention consists of the improvements which will be hereinafter fully set forth, and pointed out in the claims.
In the accompanying drawings, Figure l is a fragmentary side elevation of a vat provided with my improved man-hole cover. Fig. 2 is a horizontal section taken centrally through the man-hole. Fig. 8 is a top plan View of the man-hole cover and supportingframe on a reduced scale. Fig. 4. is a vertical sectional elevation thereof. Fig. 5 is an inside elevation, on a reduced scale, of the frame to which the cover is hinged.
Like letters of reference refer to like parts in the several Iigures.
A represents the curved side of the vat or tank, and a is the manhole, which is preferably of oval or elliptical form.
B represents a metallic elliptical frame secured to the inner side of the vat around the man-hole, and curved to conform to the inner surface of the vat. The frame B is provided with a raised flange or rim, b, extending around the frame, and having a flat or straight internal face, as represented in Figs. 2 and 3.
Gis the cover closing the man-hole a, and which is hinged at one end to the frame B on the inner side of the vat. The cover C is provided with a flat marginal face, c, having a packing, c',which rests against the flat face of the flange b when the cover is closed. The cover C is also provided with an elliptical flange, d, projecting into the opening of the frame B, and which holds the cover against lateral displacement on its seat. The flange b of the frame B also serves as a bridge or brace, which stiffens and strengthens the frame iu the longitudinal direction of the man-hole. The frame B being curved, and the flange b being made with a straight face, the Bange is i ofgradually-increasing thickness from the portions ofthe frame B which lie in the horizontal center line of the manhole toward the upper and lower portions,which lie in the vertical center line of the manhole, and at which latter point the greatest strength is required. The packing c', of rubber or other suitable material, is seated in a depression formed in the cover C, on the outer side of the flange d. By providing a flat seat for the cover a secure and reliable joint is formed between the cover and its seat, and the latter can be easily turned or planed ed.
F is an elliptical frame surrounding the manhole a, on the outer side of the vat, and against which bear the nuts of the fastening-bolts f, whereby the frames B and F are secured to the side of the vat. The frame F, in conjunction with the frame B, retains the ends of the staves around the man-holein place, and prevents the same from warping or bulging.
g is a screw-threaded shank secured to the inner side of the cover C, and passing through a smooth opening formed centrally in a crossbar or bridge-piece, G, bearing with its ends against the face of the frame F.
7i is a screw-nut applied to the outer end of the screwshank g, and bearing against the outer side of the bridge piece G. By this means the cover C is tightly clamped against its seat on the frame B. Upon removing the nut h from theshank g, the cover can be swung inwardly away from the manhole. The bridgepiece G is depressed at its center, as shown in Fig. 4, so as to project as little as possible beyond the outer side of the vat. By arranging the hinged cover on the inner side of the vat it is held against its seat by the pressure of the gases contained in the vat, in the event of the nut h becoming loose.
I claim as my inventionl. The combination, with a curved frame, B, adapted to be secured to the curved inner side ot' a vat or tank around a man-hole formed therein, and provided on its inner side with a IOO raised iiange, b, having an internal straight face, of a cover, C, hinged to the inner side of the frame B, and having a flat face bearing against the straight face ofthe flange b,substan tially as set forth.
2. The conibinatiomwith a vat or tank provided in its curved side with a man-hole, of a curved frame, B, secured to the curved inner side ofthe vat around said manhole, and provided on its inner side with a raised dange, b, having an internal straight face, a cover, C, hinged to the inner side of the frame B, and having a flat face bearing against the straight face of the iiange b, and a frame, F, surrounding the manhole on the outer side of the vat, substantially as set forth.
3. The oombination,with a vat or tank provided in its side with a man-hole, of a curved frame secured to thc inner side of the vat and provided with a iiange or bridge, b, having a straight face and made of gradually-increasing thickness from the ends of the frame B toward the center thereof, a flat-faced cover, C, resting against the iiange b and provided With a screw-shank, g, a ring, F, surrounding the man-hole on the outer side of the vat, a bridgepiece, G, extending across the man-hole and provided with an opening through which the shank gpasses, and a nut applied to said shank and bearing against the bridge-piece G, substantiall y as set forth.
Witness my hand this 10th day of February, 1888.
CARL F. GEYER, FRED. C. GEYER.