Improvements in Gully Grids.
Year: 1893

page_text: Date of Application, 15th Aug., 1893
Complete Specification Left, 15th May, 1894-Accepted, 30th June, 1894
Improvements in Gully Grids.
I, DAVID EVANS, of Eagle Foundry, Llandaff, in the County of Glamorgan,
Engineer, do hereby declare the nature of this invention to be as follows :-
The invention relates to Improvements in Gully Grids and more particularly to
the devices for locking the covers.
This arm
According to one modification, I fix to the end of the box, a locking lever,
rocking on a centre pin. A projection with a hook at its end is cast on one side
and a weighted quadrant on the other. An elongated slot in the quadrant
regulates the extent of its movement, a pin, passing through the slot, being screwed
into the back part of the box. The projecting lever opposite the quadrant has a
catch at one end, which engages with a projecting arm upon the cover.
also serves the purpose of a bearing for the point of a comparatively large key
which passes down through the beforementioned cover, the web of the key
engaging in another projection on the weighted tumbling lever below. It will be
seen that the operator has only to let the cover fall into its place, when the
tumbler automatically catches in the projecting arm of the cover, as before described
and the whole is held securely in position. The application of the key releases
the tumbler and also acts as a handle for lifting the cover.
According to another modification of this invention I attach to the underside of
the cover a simple form of lock, the bolt of which lies under the cover and is
pressed forward by a spring, the point of the bolt being eased off, so that it will
automatically close itself, and the key (which also acts as a handle) has a web
which engages with a corresponding projection upon the spring bolt. In other
respects, the cover is operated in the same way as before described.
Doted this 15th dor of Ano 1902
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Gully Grids.
I, DAVID EVANS, of Eagle Foundry, Llandaff, in the County of Glamorgan,
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 :-
This invention relates to Improvements in Gully Grids and consists in improved
devices for locking the hinged cover which controls the way by which access is had
to the sewer pipe.
In order that the invention and the best means of carrying it into practical effect
may be thoroughly understood, I will now describe it and them in detail, referring
in so doing to the accompanying figures which are to be taken as part of this
Specification and read therewith.
Figure 1 is a longitudinal sectional elevation of a gully trap and grid shewing
the cover locked.
Figure 2 is a transverse sectional elevation corresponding therewith.
Figure 3 is a side elevation of the bracket catch looking at it from the left hand
side of Figure 1.

page_text: Figure 5 is a front elevation of the locking bolt.
Figure 6 is a part plan thereof.
Figure 7 is a sectional longitudinal elevation of a modification of the invention.
Figure 8 is a sectional plan corresponding with Figure 7.
Referring to Figures 1 to 6, a is the ordinary hinged grating over the trap and
bis the hinged cover which controls the way by which access is had to the sewer
pipe c.
d is the locking bolt. It is a lever pivotted upon the pin e which is screwed into
or otherwise made fast to the side of the way to the pipe c, and consequently
moves in the vertical plane with a reciprocating arcual motion upon the said pin as
a fulcrum.
It is a
is the bracket catch with which the bolt engages to lock the cover.
shelf held parallel with the cover b and at a short distance below it by a hanger h.
This shelf is shewn as circular in plan and having a rectangular extension g
combined with it.
i is a hole in the centre of the circular portion of the shelf. It is of the proper
size to receive the nose j of the key shank k. is the web of the key and P, the
key hole.
m is the operative nose of the locking bolt d, and m¹ is the projection on it with
which the key engages for the purpose of unlocking the bolt. Consequently, the
relative positions of the shelf y and its extension g' on the one hand and of the
plane of the bolt d on the other must be such that the nose m can stand immediately
over the extension g' at the same time that the projection m' stands in the pathway
of the key-web l. The relative positions on the bolt d, of the nose m and the
projection m', provide for the former standing out of the path and the latter in the
path of the key-web at the same time.
My invention requires that the nose m should stand normally in the locking
position the one illustrated in Figures 1 and 2. To provide for it so doing, and
also for its being returned thereto after each unlocking, the bolt is continued past
the fulcrum and there made sufficiently heavy to accomplish the specified object.
n is a stud projecting from the side f. It provided to stop the bolt d when the
nose m and the projection m¹ have been swung up into the locking position. n' is
an arc shaped slot in the heavier end of the bolt. It is struck from the axis of
the pin e as a centre and is as long as the swing of the bolt d. 2 is a stud fast on
the side f. It stands in the slot ³, the two serving as a guide for the bolt and also
a stop for it in the opposite direction. o is a boss to make up the weight of the
arm of the bolt d to which it is made fast.
The action of the invention constructed as above described is as follows:-
As the cover b is being let down on to its seat, the circular portion of the shelf
and its rectangular extension g' engage with the projection m' and the nose m
respectively, thereby swinging the bolt d on its fulcrum. The dotted lines of
Figures 3 and 4 shew the edge of the extension g' rounded off; and the full lines
of Figures 5 and 6, the edge of the projection m rounded off also, to facilitate such
engagement. By the time the cover is down on its seat, the circular portion of the
catch and the extension g' have passed the projection m³ and the nose m, whereupon
the weight of the locking bolt on the opposite side of the fulcrum e swings the
nose m up into a position immediately over the extension and holds it there and the
projection m¹ in the path of the key-web.
The bolt is unlocked by passing the key-web through the key hole
until
the nose of the shank k is in the hole i, and turning the key till its web has pushed
the projection m' far enough to carry both it and the extension m out of the path
of the catch g. A suitable stop may be provided to prevent the web being
turned farther than is necessary to swing the locking bolt as much as the act of
unlocking it requires.
The bolt is recti-
Referring to Figures 7 and 8, p is the bolt and pits case.
linear in shape and action. It is shot or locked into the socket p' in the side f

page_text: by a spring 9 acting between the closed end of the case p¹ and the rear end of the
bolt, and unlocked by the engagement of the key web in a recess formed for
that purpose in the bolt p. The nose j of the key-shank k engages in a suitable
hole in the case p¹ in the same way as in the catch g of the construction already
described. is a guide fixed in the bolt and working in a slot t in the bolt case.
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. The combination with the cover or with the grid, of the automatic looking
device, as set forth with reference to Figures 1 to 6.
2. The combination with the cover or with the grid, of a pivotted locking bolt
adapted to be engaged by a weight, with the catch on the cover or on the grid, as
Bet forth.
3. The combination with the cover or with the grid, of the automatic locking
device as set forth with reference to Figures 7.and 8.
וי.
5
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.