Improvements in Air-tight Covers for the Cleaning or Inspection Eyes of Soil Pipes, Drains, Traps, or Sewers.
Year: 1898

page_text: Date of Application, 27th Apr., 1898-Accepted, 9th July, 1898
COMPLETE SPECIFICATION.
Improvements in Air-tight Covers for the Cleaning or Inspection
Eyes of Soil Pipes, Drains, Traps, or Sewers.
I, DAVID WADDELL BUCHAN, of 36, Renfrew Street, in the City of Glasgow,
Sanitary 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 statement:—
The object of this invention is to provide an air-tight cover or box frame for
the cleaning or inspection eyes of drains or sewers etc. having improved locking
devices whereby the necessity for sealing down such covers with cement is dis-
pensed with and their removal for inspection thus facilitated.
The invention is illustrated under several modifications by the accompanying
drawings, Figure 1 being a vertical section and Figure 2 a plan of an inspection
or cleaning eye for a drain or intercepting trap, etc. Figures 3 and 4 are views
corresponding to Figure 1 of modified forms of cover which are applied to the
inspection or cleaning eyes of drains and intercepting traps in the same manner
as the cover shewn at Figure 1.
In carrying out the invention I provide a socket A which I cement permanently
into the ordinary stoneware or iron faucet of the inspection eye of a drain, trap or
sewer pipe and form said socket A as shewn at Figure 1 with an annular channel A¹
which I fill with grease or other sealing material and into which dips an annular
projection B formed on the under side of the air-tight cover B. On the upper
side of the air-tight cover B projections B2 are formed diametrically opposite each
other which enter vertical slots A2 in the socket A when the air-tight cover B
is being placed in position. These projections 12 in conjunction with inclined
lips A3 form the locking device and press the cover B down upon its seat thereby
forming an air-tight joint which prevents the escape of gases from the drain or
An outer cover C.is provided which is formed as shewn at Figure 1
sewer, etc.
and rests upon a seat suitably formed and coated with grease to prevent the
entrance of air and moisture from without. This outer cover C may be provided
with a socket C¹ when the inspection eye is placed on a horizontal drain pipe in
order that it may be secured by a pin 2 or by a screw entered through the top
as shewn in dotted lines, Figure 1, to a projecting part B3 on the air-tight cover B.
The air-tight cover B may be formed with a bridge piece B4 in order that the
cover may be turned to remove it by hand or be formed as at B5, Figure 3, so as to.
be turned by means of a key.
Figure 3 shews a modification in which the outer cover and the air-tight cover
are formed in one piece, this form being specially suitable for an inspection eye,
the cover of which is intended to be flush with the ground or inside wall of a man-
hole. The cover may be made to open with a key, as B, Figure 3, or have a
bridge handle as in Figure 1. Figure 4 is a modification of Figure 1 in which
an additional cover D is provided. The outer cover in this form is intended to
be flush with the ground and is made longer at the taper end than the other
forms so as to be suitable for the faucets of iron pipes, etc. Figure 3 may be
similarly constructed.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
The improved air-tight cover and socket for the inspection eyes of soil pipes,
drains, traps, and sewers, etc., constructed substantially as described under several
modifications with reference to the accompanying drawings.
11 11. oci
1
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1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow.
Agent for the Applicant.