Improvements in Removable Stoppers for Manhole Covers and similar Orifices for Drainage and other Purposes.
Year: 1890

page_text: Date of Application, 5th Apr., 1890-Accepted, 17th May, 1890
COMPLETE SPECIFICATION.
Improvements in Removable Stoppers for Manhole Covers and
similar Orifices for Drainage and other Purposes.
I GEORGE JENNINGS, of Palace Wharf Stangate, London, S.E. Engineer do
hereby declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following state-
ment thereof that is to say :-
This invention relates to improvements in removable stoppers for manhole covers
and similar orifices for drainage and other purposes and consists in the use of a collar
of india-rubber or other elastic material of special form which is compressed to form
a tight joint by means of a screw between two metal flanges each comprising a
portion of two separate parts forming the body of the stopper. My improved
stoppers may be of circular, oval or other suitable shape. The circumference of the
two parts forming the body are constructed with recessed flanges into which fit the
upper and lower edges of the elastic collar for which purpose the said collar is shaped
or recessed so as to agree with the shape of the flanges. By reason of the edges of
the elastic ring being thus recessed they are protected by the outer flanges of the
two parts forming the body of the stopper. A screw bolt passes through the centres
of the aforesaid separate parts and is fitted with a nut the tightening of which com-
presses the elastic collar between them, thereby bulging the central part of the said
collar outwards and forming a tight joint between the outer circumference of the
stopper and the inner circumference of the aperture formed in the man-hole cover.
And in order that my invention may be more fully understood I will describe the
same with reference to the accompanying sheet of drawings in which Fig. I is a
central vertical section of my improved stopper and Fig. II is a plan of the same.
a and b are the two separate parts forming respectively the upper and lower portions
of the body of the stopper, and c is the elastic collar in position between them.
The parts a and b are formed with recessed flanges a¹, around their circumferences
into which fit the upper and lower edges of the ring c, the said ring being cut away
or recessed for that purpose. The two parts a and b are formed with central
bosses d, d' through which passes a screw bolt e having at its lower end a squared
portion e' which enters a square hole in the boss d¹ to prevent the bolt from turning.
is a leather washer against which the head of the bolt bears, and g is a nut by means of
which the upper part a is pressed towards the lower part 6. The two parts a and b
are strengthened by means of radial ribs a² and b and the top part a can be readily
removed by unscrewing the nut g for the purpose of removing or replacing the elastic
ring c.
Having now described and ascertained the nature of my said invention and
explained the manner of carrying it into practical effect I declare that what 1
claim is
1. The improvements in removable stoppers for man-hole covers and similar orifices
for drainage and other purposes substantially as described and shewn in the accom-
panying drawings.
2. The improved form of compressible ring recessed at its upper and lower edges
substantially as shewn and for the purpose specified.
HUGHES, ELI & HUGHES,
76, Chancery Lane, London, W.C., Agents for Applicant.