Improvements in Manhole Covers for Sewers and the like.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Manhole Covers for Sewers and the like.
I, LANCELOT WILLIAM LEES, of Grove Foundry, Gomersal, near Leeds, in the
County of York, Engineer, do hereby declare the nature of this invention to be
as follows:-
The object of my invention is to provide a simple and effective means of ad-
justing the ventilation of sewers and the like.
I make the cover of the manhole with a series of preferably radial slots or
holes; and pivotted centrally to the cover, on the inner side, is a plate with corre-
sponding radial slots. This plate may be turned, so as to close and open the slots.
or holes, by means of a box key fitting on to the squared end of the pivot, which
is sunk or recessed in the cover.
The slots or holes may be rectangular, curved, or of any desired shapes, and the
arrangement may be fitted to any type of manhole cover. The connecting bolt
or pivot is preferably made of gunmetal to prevent corrosion.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicant.
Improvements in Manhole Covers for Sewers and the like.
I, LANCELOT WILLIAM LEES, of Grove Foundry, Gomersal, near Leeds, in the
County of York, 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 my invention is to provide a manhole cover for sewers and the
like with a simple and effective means of adjusting the ventilation.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a sectional elevation of my improved adjustable manhole cover, shown
in its closed position.
Fig. 2 is a plan of same, with the cap G removed.
According to my invention the cover A of the manhole is fixed in any suitable
manner within the frame or box B, and is provided with a series of slots or air
spaces C, which may be rectangular, curved, or of any desired shape, but are
preferably radial.

page_text: Pivotted centrally to and in contact with the cover A, on the inner side, is
a curved or dished plate D with a corresponding series of slots or air spaces C.
The said inner plate D may be turned, so as to open or close the slots or air
passages C, by means of a box key fitting on to the squared end of the central
connecting pivot F, which is sunk or recessed in the cover A and is preferably
made of gunmetal to prevent corrosion. The pivot F may also work in a gun-
metal bush in the cover A.
If required to protect the squared end E of the pivot, a detachable cap G may
be provided, held in position by means of pins Hengaging in angular, slots K
in the cover A.
My adjustable ventilating arrangement may be fitted to any type of manhole
or the like cover.
XAL
117
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:
102.4
1. In a cover for sewer manholes or the like, the employment of an inner
revoluble plate having radial slots or other suitable perforations, pivotted to and
sliding over a similarly perforated fixed 'outer plate, so as to adjust the amount
of ventilation of the sewer, substantially as shown and described.
.1.
..".
2. In a cover for sewer manholes or the like, the combination of the fixed per-
forated cover A, the frame or box B; the revoluble perforated plate D, the pivot F
with squared end E, and the cap G, all'arranged substantially as and for the
purposes, shown and described.
Natal 1911
J
1 1000
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JOHN E. WALSH,
94
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicant..
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent for the Applicant..