AN IMPROVED SELF LOCKING AND BURGLAR PROOF COAL PLATE
Year: 1886

page_text: I GEORGE KYTE of Mill Lane Ironworks, Cardiff, in the County of Glamorgan,
Engineer, do hereby declare the nature of my invention for AN IMPROVED SELF
LOCKING AND BURGLAR PROOF COAL PLATE to be as follows:-
I make a metallic Coal plate of round, oval, square or polygon form and of any
convenient dimensions with a metallic socket of suitable form and dimensions to
receive the same, the socket having a fillet projecting from its inner surface, this
fillet has its upper edge sloped off to prevent particles of Coal or other matter
resting and the lower edge of the Coal plate has a coresponding bevel to fit the
same, This fillet is marked A on the drawing attached hereto and with reference
to which the letters of reference used in this Specification regard parts similarly
lettered on the drawing-The Coal plate is made to fit within the rebate formed
on the socket by the fillet, and on the underside of the Coal plate are cast two
paralell guards or sheilds B. B. with the guides C. C. C. C. C. C. in which slide the
latch bolts D. D., having the edges of the locking ends shaped in the manner shewn
in the drawing, and their inner ends toggle jointed, as illustrated. Passing through
the guards or sheild plates B. B. is a bolt pin or rivet E, on which bolt pin or rivet
works a counter-balancing tumbler F. having toggles G. G. engaging with the
joints made to receive them on the inner end of the latch bolts D.D. The counter-
balance on the tumbler F is so placed and overweighted, as shewn in the drawing,
as to cause by its gravity, the latch. bolts D. D. to be projected outwards from the
centre of the Coal plate.
The Coal Plate is also provided, when necessary, with ventilating perforations,
also serving to raise the Coal Plate by, these perforations may be of any shape in
plan and are directed through the plate at an angle to its plane, the intention of
these perforations being made in the manner specified being to prevent the lock of
the Coal Plate being picked or tampered with.
The action of the invention is as follows. On the Coal Plate being dropped
into the socket the curved edges of the latch bolts D. D. strike against the edges
of the fillet A and are forced back towards the centre of the Coal plate, and when
the ends of the latch bolts D. D. pass the lower edge of the fillet A, the counter
balance of the tumbler F, gravitating towards the centre and being engaged in the
ends of the latch bolts D. D. by means of the toggles G. G. force, the outer ends of

page_text: the latch bolts D. D. to engage beneath the lower edge of the fillet A and thus
lock the Coal Plate in the socket.
To unlock the Coal Plate to receive Coal, the tumbler F. is moved from below in
the direction shewn in the drawing by the arrow, when the toggles G. G. withdraw
the latch bolts D. D. and the Coal Plate is free to be raised or may be pushed up
from below; but cannot be opened from above.
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An Improved Self-locking and Burglar-proof Coal Plate.
I GEORGE KYTE of Mill Lane Ironworks Cardiff, in the County of Glamorgan,
Engineer, do hereby declare the nature of any invention for AN IMPROVED SELF
LOCKING AND BURGLAR PROOF COAL-PLATE and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
I make a metallic Coal plate, of round, oval, square or polygon form, and of any
convenient size, with a metallic socket of suitable form and size to receive the
same; the socket having a fillet projecting from its inner surface; this fillet has
its upper edge sloped off to prevent particles of Coal or other matter resting, and
the lower edge of the Coal plate has a corresponding bevel to fit the same-The
fillet is marked A on the drawing left with the Provisional Specification No. 3115
dated March 5th 1886, and with regard to which drawing the letters of reference
used herein refer to parts similarly lettered on such drawing-The Coal plate is
made to fit within the rebate formed on the socket by the fillet A. On the under-
side of the Coal-plate are two paralell guards or sheilds B. B. with the guides C. C.
C. C. C. C. in which slide the latch bolts D. D. having the edges of the locking ends
shaped in the manner shewn on the drawing, and their inner ends toggle or pin
jointed Passing through the guards or shield plates B. B. is a bolt, pin, or rivet E
on which works a counterbalancing tumbler F. having toggles or pins G. G.
engaging with the joints made to receive them on the inner ends of the latch
bolts D. D; the counterbalance on the tumbler F is so placed and overweighted,
(as shewn in the drawing) as to cause by its gravity, the latch bolts D. D. to be
projected outwards from the centre of the Coal-plate.
The Coal-plate is provided, when necessary, with ventilating perforations, these
perforations also serving to raise the Coal plate by-The perforations may be of
any shape in plan, and are directed through the plate at an angle to its plane, the
intention of the perforations being made in the manner specified being to prevent
the lock of the Coal plate being picked or tampered with.

page_text: The action of the invention is as follows-On the Coal plate being dropped into
the socket the curved edges of the latch bolts D. D. strike against the edges of the
fillet A and are forced back towards the centre of the Coal-plate; when the ends
of the latch bolts D. D. pass the lower edge of the fillet A the counterbalance of
the tumbler F gravitating towards the centre and being engaged in the ends of the
latch bolts D. D, by means of the toggles or pins G. G., force the outer ends of the
latch bolts D..D. to engage beneath the lower edge of the fillet A. and thus lock
the Coal plate in the socket.
To unlock the Coal plate, to receive coal, the tumbler F is moved from below in
the direction shewn on the drawing; when the toggles or pins G. G. withdraw the
latch bolts D. D. and the Coal-plate is free to be raised or may be pushed up from
below,
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;
1st. That the Invention is self-locking, the simple action of dropping the Coal-
plate into its seat being sufficient to secure it.
2nd. That the Coal plate being closed it cannot be opened from above; thus
preventing the ingress of burglars through the Coal cellar."
3rd. That the coal plate will not cant, or turn over, by side pressure, thus
affording a secure footing to passengers and a protection to life and limb.
4th. Having few and simple working parts, the Invention is not liable to get
deranged or out of order forming a combination of parts constituting an improved
Self-locking and burglar proof Coal-plate.