Improvements in or relating to Manhole Covers.
Year: 1894

page_text: Date of Application, 31st May, 1894-Accepted, 7th July, 1894
COMPLETE SPECIFICATION.
Improvements in or relating to Manhole Covers.
We, FREDERICK TEMPLAR FARRER, of 17 Flood Street, Chelsea, in the-
County of London, Sanitary Engineer, and PERCIVAL BAKER EVANS, Associate
Sanitary Institute of 16 Irene Road, Poole Park, Fulham, in the County of
London, 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 statement:-
This invention relates to manhole covers for drainage purposes and we will
describe it as applied to a cover for an inspection chamber of ordinary house
drains. The cover may be of any ordinary construction, but we combine with it
a gully which may be arranged in various. ways. For example the cover may be
provided with an opening preferably in the centre in or upon which is placed a.
gully grid from which a wall or "dip" preferably conical slopes down into a bas n
or bell so as to provide a water seal in the well-known manner. The basin may be
provided with a lip, pipe, or other means of carrying off the contents of the basin,.
the lip or opening being closed or open as preferred. In either case it is desirable,
though not absolutely necessary, that the basin should discharge vertically over
the usual channel or half-drain of the inspection chamber so that the liquids may
fall directly into this channel instead of being scattered over the bottom of the
inspection chamber. A. pipe from the basin may be carried directly down to the-
channel.
The basin may be connected directly to the cover being if desired formed in a
piece with it or it may be loose and carried upon any suitable frame-work connected.
with the walls of the inspection chamber or the framing thereof. We do not bind
ourselves to any particular construction of gully or trap the invention relating
more particularly to the combination of a gully with a manhole cover.
In the accompanying drawings:
:-
Figure 1 represents a vertical section through the cover, gully and inspection.
chamber,
Figure 2 representing the basin or bell with a lip, and-
Figure 3 showing it with a tube.
Like letters represent like parts throughout the drawings.
A is the manhole cover of ordinary construction, but having an opening A¹ into
which the gully grid B is inserted, preferably loosely, so that it may be removed
when required. C is the wall or dip of the cover preferably made conical as
shown, the lower edge of C being intended to dip into the liquid contained in the
basin or bell D so as to form a water seal in the usual manner. The contents of
the basin overflow through the lip D¹ or through the pipe E placed in any
convenient position upon the basin D, the arrangement in either case being
preferably such that the overflow from the basin is delivered directly into the drain
or channel F at the bottom of the inspection chamber. In the drawings the
basin D is shown provided with arms D² which fit into preferably V-shaped
bearings G upon the frame G at the top of the inspection chamber H thus holding
the basin securely in position, although it can be freely removed when required.
Instead of supporting the basin in the inspection chamber it will be appreciated
that it may be cast in one piece with the cover A or secured thereto or to the
dip or may be otherwise supported in any convenient manner from either the
cover or any part of the inspection chamber or its frame.

page_text: By this invention we have the double convenience of a gully and a removable
manhole cover to the inspection chamber so that it is not necessary to provide a
separate gully and inspection chamber.
If desired the dip Ċ and basin D may be enamelled or provided with loose
linings of earthenware or other material preferably with glazed surfaces; or the
dip and basin may be made completely of earthenware. or the like and the dip
connected with the cover A in any suitable manner with a gas-tight joint.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A combined gully and manhole cover for drains.
2. A combined gully and inspection chamber for drains.
3. The combination with a manhole cover of a gully opening 'A' grid B and dip.
and basin such as CD substantially as described and illustrated in the accompanying
drawings.
4. The combination with a manhole cover having a water seal connection or
dip such as C of a basin such as D removably supported in the inspection chamber or
shaft H substantially as described and illustrated in Figure 1 of the accompanying
drawings.
5. The combination with a manhole cover of a dip such as C of earthenware or
the like or lined therewith substantially as described.
Dated this 30th day of May 1894.
FREDERICK TEMPLAR FARRER.
PERCIVAL BAKER EVANS.
W. P. Thompson & Boult,
Agents for the Applicants.