Improvements in Area Grates and Frames, Coal Shoots, and other Coverings for Cellar Openings.
Year: 1891

page_text: Date of Application, 20th June, 1891
Complete Specification Left, 21st Mar., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Area Grates and Frames, Coal Shoots, and other
Coverings for Cellar Openings.
I JOHN DERBYSHIRE of Hall Cottage Longton in the County of Stafford
Mechanical Engineer and Iron Founder, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object improvements in area grates and frames, coal
shoots and other coverings for cellar openings.
1 make
The grates and frames may be rectangular, round, or in any other form.
the gratings or doors, with a bolt or bolts on one edge, and provide slots in the
frame to receive such bolt or bolts. On the opposite side of the grate or door is a
socket, the face of which is struck, by preference, to a radius of the width of the
grate or door.
Provision is made on the corresponding side of the frame, for a
spring, or lever bolt, the socket of which has a curved face to suit that upon the
grate or door. Putting in the grate or door, pushes back the bolt; which is re-shot
by the force of the spring or lever when opposite the socket. They are self locking,
cannot be put down without being locked. And can only be opened from inside
either by direct pull, or a lever.
Dated this 18th day of June 1891
JOHN DERBYSHIRE.
COMPLETE SPECIFICATION.
Improvements in Area Grates and Frames, Coal Shoots, and other
Coverings for Cellar Openings.
I JOHN DERBYSHIRE of Hall Cottage Longton in the County of Stafford
Mechanical Engineer and Iron Founder do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention has for its object improvements in area grates and frames coal
shoots, and other coverings for cellar openings and in the mode of fastening the
same.
The grates or covers may be made rectangular round, or in any other form.
I make the grates or doors with a bolt or bolts on one side, and provide a recess
or recesses in the frame to receive such bolt or bolts, on the opposite side of
the grate or cover is a socket the face of which is by preference struck to a
radius of the width of the grate or cover.
Provision is made in the corresponding
side of the frame for a spring or lever bolt by preference made of brass, the socket
for which has a curved face to suit that upon the grate or cover, to ensure a good
fit, so that nothing can be inserted to push back the bolt. Putting in the grate or
door, pushes back the bolt & spring, which rebound as the socket in the curved
face on the grate or door comes opposite the bolt and so effectually locks the grate
or door in the frame. The grates or covers are self locking, they cannot be put
down without being locked and can only be opened from inside the house or cellar,
by direct pull, or a lever.
Fig. 1, is a plan of a grate and frame.
Fig. 2, is a section of Fig. 1, showing the bolt or bolts on the grate, and the
recess in the frame to receive them on one side. And on the other side, the tab and
socket on the grate, and attached to the frame, the nipple, reducing socket, and
tube through the wall, with the brass bolt, spring and pull rod.

page_text: Fig. 3, is a plan of covering a coal shoot with grate opening.
Fig. 4, is a section of Fig. 3 showing similar bolts, and mode of fastening as
Fig. 2, the pull rod of which may be continued through the wall if necessary.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is
Grates & frames made substantially as per plans. The grates made with fast
bolts on one side and with a tab on the other side, socketed to receive a spring bolt.
The frames having slots on one side to receive the fast bolts, and on the other side,
provided with a spring bolt, which recedes when the grate is put in the frame until it
is low enough for the bolt to rebound into the socket in the tab, and so securely
lock the grate into the frame.
Dated this 19th day of March 1892
JOHN DERBYSHIRE.