An Improved Grating for Intercepting Traps.
Year: 1896

page_text: An Improved Grating for Intercepting Traps.
I, WALTER HENRY READING, of No. 16, Vicarage Road, Wolverhampton, in
the County of Stafford, Drainage Inspector, do hereby declare the nature of this
invention to be as follows:-
This invention consists of the hereindescribed improved grating, for intercepting
traps of drains, which is constructed and arranged as follows so that the act of
closing the cover part of the grating will lock the same to the frame part to
prevent the cover from being opened until it has been unlocked by a key. The
said perforated cover part is of rectangular or other suitable form corresponding
with the metal frame in which the cover fits and to which the cover is hinged at
one side by a hinge pin passing through the frame and through ears or lugs on the
underside of the cover. In the side of the frame opposite the said hinge I provide
a recess or chamber in which there is a slide or bolt adapted to move to and fro,
The fore end of the said slide or bolt projects through the inner face of the frame
eo as to engage in a notch or recess formed in the edge of the cover and thereby
to lock the cover closed in the frame. The slide or bolt is or may be shot forward
into this position by means of a spring in the said recess. The fore end of the
slide or bolt is inclined above so as to be forced back into the recess by closing
the cover and to spring forward again and engage with and lock the cover when
the latter is closed.
In order to withdraw the bolt or slide to unlock the cover I provide a tubular
bush which passes transversely through the slide and turns in bearings in the
frame. Fitting on this bush and within the slide or bolt I provide a tongue piece
which, when the bush is turned through a small angle, acts upon a projection or
part of the bolt or slide and moves the same back into the recess thus unlocking
the cover. The said bush is made of square or other suitable shape internally so
as to be turned only by a key inserted therein.
Dated thin 7th dox of Wahman 1000
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
An Improved Grating for Intercepting Traps.
I, WALTER HENRY READING, of No. 16, Vicarage Road, Wolverhampton, in
the County of Stafford, Drainage Inspector, 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 consists of the hereindescribed improved grating for intercepting

page_text: raps or drains, which constructed and arranged as I will describe by referring
'to the accompanying drawing on which
an
Fig. 1 is a sectional elevation of my invention applied over the air inlet pipe of
intercepting trap;
Fig. 2 is a plan of the said grating;
Fig. 3 is a cross sectional elevation of the same;
Fig. 4 is a plan and a side view of a part of the lock of the said grating;
Fig. 5 is a plan and sectional elevation of another part of the said lock and "
Fig. 6 is an elevation of a key suitable for operating the said lock.
The same or letters of reference indicate the same or corresponding parts in all
the figures.
My said improved grating is for use in roadways and other places over the air
inlet pipe of the intercepting trap of a drain to allow fresh air to pass down the
air inlet pipe but prevent stones or other obstructions falling down the pipe the
said grating being so constructed and arranged that the act of closing the cover
part will lock the same to the frame part and prevent the cover from being opened
until it has been unlocked by a key.
A is the perforated cover part of the grating made of rectangular or other
suitable form to correspond with the metal frame B in which the cover A fits and
to which the cover A is at one side hinged by a pin C passing through the frame
and through ears or lugs a formed on the underside of the cover A. The openings
in the grating are shaded and it will be seen that they are so arranged that the
part of the cover A immediately over the air inlet pipe D is left blank to prevent
stones or other rubbish from falling down the pipe D. In the side b¹ of the
frame B opposite the hinge CI provide a recess or chamber E in which there is
a slide or bolt F (shewn separately by Fig. 4) adapted to move to and fro.
The fore end of the slide or bolt F projects through the inner face of the
frame B so as to engage in a notch or recess Ġ formed in the edge of the cover A
and thereby to lock the cover A closed in the frame B. The slide or bolt F may
be shot forward into the position shewn in Figs. 1 and 2 by means of a spring
such as that shewn by dotted lines and marked h in Fig. 2 in the recess E. The
fore end of the bolt F is inclined so as to be forced back into the recess E by
closing the cover, and then when the spring is used the bolt F will spring forward
again and engage with and lock the cover A when the latter is closed. When
the spring his not used the bolt or slide F is moved forward to lock the cover A
by means of a bush I and tongue piece J which I will now describe.
The tubular part I passes transversely through the slide or bolt F (which as
shewn is made with a large hole ft) and turns in bearings in the frame B.
Fitting on this bush I, I provide the tongue piece J which, when the bush is
turned through a small angle, acts upon a projection for part of the bolt or
slide F and moves the same back into the recess E thus unlocking the cover A.
To lock the cover when the spring is not used the bush I and tongue piece J
have to be turned in the opposite direction to that required for unlocking. The
bush I has a central hole of a square or other suitable shape so as to be turned
only by a key inserted therein such a key for instance as that marked L and
shewn in Fig. 6 and made with a square end which will engage with the
hole i
The parts FI and J of the lock are by preference made of brass or gun metal
to prevent their rusting.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a grating for the air inlet pipes of intercepting traps for drains, the
combination of a metal frame, a perforated cover fitting in and hinged at one side
to said frame, and a locking slide arranged in a recess in one side of the frame and
adapted to engage with a hole in the cover to lock the same to the frame, and

page_text: means for moving the said slide to, and fro, all substantially as hereinbefore set
forth.
2. In a grating for the air inlet pipes of intercepting traps for drains, the
combination of the metal frame B, the perforated cover A fitting in and hinged at
one side to said frame and the lock F I J arranged in one side of the frame to lock.
the cover when closed all substantially as herein before described and illustrated by
the accompanying drawings.
Dated this 9th day of November 1896.
CHARLES BOSWORTH KETLEY,.
Agent for the Applicant.