Improvements in Locking Gully Grids, Inspection Covers, Manhole Covers, and the like.
Year: 1893

page_text: Date of Application, 19th Aug., 1893
omplete Specification Left, 19th Oct., 1893-Accepted, 25th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Locking Gully Grids, Inspection Covers, Manhole
Covers, and the like.
I, FRANKLIN JACKSON John Street Foundry Cardiff County Glamorgan do
hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a simple and effective means for
locking the lids or doors of street gullies or manholes etc. and to effect which, I cast
two studs on the inside of the gully or manhole frame about three inches apart, one
of these studs is a pivot on which a bell crank catch is fitted, said catch having at
one end a hook which engages with a hook or projection cast on the underside of
the lid, and at the other or weighted end of the catch is a radial slot, which when
the catch is fixed in position, fits over the second stud and regulates the movement
of the catch so that it can only move through an arc sufficient to clear the hook on
the lid and allow the lid to be lifted; a lug is cast on the side of the catch so that
by inserting a key thro a hole provided in the lid, the catch can be disengaged
and the lid can be opened, when the door is closed the catch engages without using
the key, the catch being so balanced that it locks itself. A ledge may be cast on
the underside of the lid below the keyhole so that the key can only be inserted a
certain distance.
Dated this 14th day of August 1893
FRANKLIN JACKSON.
COMPLETE SPECIFICATION.
Improvements in Locking Gully Grids, Inspection Covers, Manhole
Covers, and the like.
I, FRANKLIN JACKSON of John Street Foundry Cardiff, County Glamorgan
Ironfounder 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 :-
In order that my invention may be more clearly understood reference is given to
the accompanying drawing and to the letters of reference thereon.
Figure 1. is an elevation showing part of a gully or manhole frame and door
with catch fitted in position.
Figure 2. is a plan of same with door removed.
Like parts are marked with same letters of reference in both views.
A and B are part of a frame and door respectively; C is a hook on underside
of door with which catch F, engages D and E are studs cast as part of the
frame A.
The catch F is mounted on stud D, the radial slot G encloses stud E and
regulates the movement of catch also holds it in position for re-locking, when
the door is open. H, is a projection on catch against which the key acts to
unlock. The catch is secured on stud D by a split pin and washer, or their
equivalent.
A suitable key inserted through an opening in the door moves the catch into
position shown dotted in Fig. 1, the door being lifted the catch falls back into
locking position, the stud E supporting the weighted end of catch; in closing the
door the hook C forces catch F into dotted position Fig. 1, until the point of
contact is passed when catch F closes over the hook C.

page_text: 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
1st. The two studs cast on the frame, one acting as a pivot, the other to regulate
the amount of movement of catch.
2nd. A catch having a radial slot to regulate its movement.
3rd. The combination of a catch with radial slot, mounted on studs cast on
the frame, constructed and arranged substantially as herein described and
illustrated.
Dated L
1
F. JACKSON.