IMPROVEMENTS IN IRON SAFES AND STRONG ROOM DOORS, AND FOR OTHER PURPOSES.” HAD GAME PROVISIONAL SPECIFICATION
Year: 1874

page_text: LETTERS PATENT to George Haytor Chubb, of St. Paul's Churchyard,
of the City of London, Ebenezer Hunter, of Horsley Field, Wolver-
hampton, in the County of Stafford, and William Henry Chalk, of
43, Rye Hill Park, Peckham, in the County of Surrey, for the
Invention of "IMPROVEMENTS IN IRON SAFES AND STRONG ROOM DOORS,
AND FOR OTHER PURPOSES.”
HAD
GAME
PROVISIONAL SPECIFICATION left by the said George Hayter Chubb,
Ebenezer Hunter, and William Henry Chalk at the Office of the
Commissioners of Patents, with their Petition, on the 21st December
1874.
We, GEORGE HAYTOR CHUBB, of St. Paul's Churchyard, in the City
of London, EBENEZER HUNTER, of Horsley Field, Wolverhampton, in
the County of Stafford, and WILLIAM HENRY CHALK, of 43, Rye Hill
Park, Peckham, in the County of Surrey, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN IRON SAFES AND STRONG ROOM

page_text: DOORS, AND IN LOCKS FOR THE SAME, AND FOR OTHER PURPOSES," to be as
follows :-
In constructing safes in the manner described in the Specification of
a Patent granted to G. H. Chubb and W. H. Chalk, on the 24th day of
January, 1874, No. 320, instead of fastening the front face of the
lining by screws in the manner described we bend the edge of the front
face outwards so that it may lie against the side plate of the lining, and
be secured to this plate by screws or rivets; or we use an angle-shaped
face bar for the same purpose.
In order also to fasten the body plates of the safe on to the frame we
form square or oblong holes through the body plates, and round holes
sunk into but not through the frame iron. Round or square rivets
screwed at one end are then screwed into the frame and their other ends
rivetted up into the square or oblong and countersunk holes of the body
plate, thus forming rivets, which cannot be driven inwards nor screwed
or forced out.
In constructing the frames to receive the iron doors of strong rooms
we use a frame of an L section having a projection standing out from it
for the bolts to hold behind. When the door is to open outwards the
projection is placed thus 7, and when the door is to open inwards
it is placed thus
By this means the same solid bar which forms
the frame, or part of the frame, is not only provided with a projection
for the bolts to hold behind, but has also a flange standing outwards
from it, which enables it to be better held by the brick or stonework,
and also stiffens it against the action of wedges or the pressure of sur-
rounding brickwork.
In locks for securing the doors of safes, strong rooms, and such like,
in order to afford increased security against the bolt being forced back,
and to retain the bolt from falling or being drawn back in the event of
the interior of the lock being cut away or destroyed we employ two side
or sentinel bolts to fasten into the two sides of the bolt. The sentinel
bolts lie within recesses in the thickness of selvedge of the lock, and
when the bolt is fully shot the sentinel bolts are shot forward to enter
recesses formed in it. When in unlocking the lock the tumblers are
brought by the action of the key into a position to allow of the bolt a
being drawn back the sentinel bolts are simultaneously withdrawn. To

page_text: effect this the sentinel bolt may either be worked in connection with
tumbler levers or slides to be acted upon by the key or by a projection
on the barrel of the revolving curtain and leave the bolt free. Or in
place of employing sentinel bolts on either side of the bolt of a lock as
above described, to sustain the bolt in the event of the interior of the
lock being destroyed, we employ springs fixed under or in the bolt head
to bear against the exterior of the selvedge or on fixed abutments
distinct from it.
In order to secure the bolt straps of safes, where two bolts or sets of
bolts are used, instead of securing only one strap with the bolt of the
lock we place the straps in such a position that when they are moved
outwards the lock bolt may come between them and so secure both
straps.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Hayter Chubb, Ebenezer Hunter, and
William Henry Chalk in the Great Seal Patent Office on the 21st
June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
HAYTER CHUBB, of St. Paul's Churchyard, in the City of London,
EBENEZER HUNTER, of Horseley Field, Wolverhampton, in the County
of Stafford, and WILLIAM HENRY CHALK, of 43, Rye Hill Park, Peckham,
in the County of Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of December, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said George Hayter Chubb, Ebenezer
Hunter, and William Henry Chalk, Her special license that we, the said
George Hayter Chubb, Ebenezer Hunter, and William Henry Chalk,
our executors, administrators, and assigns, or such others as we, the
said George Hayter Chubb, Ebenezer Hunter, and William Henry Chalk,
our executors, administrators, and assigns, should at any time agree
with, and no. others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain

page_text: and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN IRON SAFES AND STRONG ROOM DOORS, AND IN LOCKS FOR THE
SAME, AND FOR OTHER PURPOSES," upon the condition (amongst others) that
we, the said George Hayter Chubb, Ebenezer Hunter, and William
Henry Chalk, our executors or administrators, by an instrument in
writing under our or their hands and scals, or under the hand and
seal of one of us or them, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said George Hayter Chubb, on behalf of
myself and the said Ebenezer Hunter and William Henry Chalk, do
hereby declare the nature of the said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
In constructing safes in the manner described in the Specification of
a Patent granted to G. H. Chubb and W. H. Chalk, on the 24th day of
January 1874, No. 320, instead of fastening the front face of the lining by
screws in the way proposed in that Specification we bend the edge of the
front face outwards so that it may lic against the side plate of the lining
and be secured to this plate by screws or rivets. This method of con-
struction is illustrated in Figure 1. a is a portion of the frame; b, a
portion of the body plating; c is the side plate of the lining; and d, the
face plate of the lining formed as described, and rivetted to the side
plate. Or we use an angle-shaped face bar for the same purpose, as is
shown in Figure 2.
In order also to fasten the body plates of the safe on to the frame we
form square or oblong holes through the body plates, and round holes
sunk into but not through the frame iron. Round or square rivets
screwed at one end are then screwed into the frame and their other ends
rivetted up into the square or oblong and countersunk holes of the body
plate, thus forming rivets which cannot be driven inwards nor screwed
or forced out. This method of construction is illustrated in Figure 1.
In constructing the frames to receive the iron doors of strong rooms
we use a frame of an L section having a projection standing out from it.

page_text: for the bolts to hold behind. When the door is to open outwards the
projection is placed thus 7. Figure 3 shows a section of such a
door frame, the dotted lines indicate the position of the bolts when shot.
The position of a portion of the door is also indicated. Figure 3* is a
modified form of Figure 3 admitting of the door and frame fitting more
closely together. By this means the same solid bar which forms the
frame, or part of the frame, is not only provided with a projection for
the bolts to hold behind, but has also a flange standing outwards from
it which enables it to be better held by the brick or stonework, and also
stiffens it against the action of wedges or the pressure of surrounding
brickwork.
When the door opens inwards we form the frame of the section shown
at Figure 4; holes are then cut in the frame to receive the bolts.
In locks for securing the doors of safes, strong rooms, and such like,
in order to afford increased security against the bolt being forced back,
and to retain the bolt from falling or being drawn back, in the event of
the interior of the lock being cut away or destroyed, we employ two sido
or sentinel bolts to fasten into the two sides of the bolt. The sentinel
bolts lie within recesses in the thickness of selvage of the lock, and
when the bolt is fully shot the sentinel bolts are shot forward to enter
recesses formed in it. When in unlocking the lock the tumblers are
brought by the action of the key into a position to allow of the bolt
being drawn back the sentinel bolts are simultaneously withdrawn and
leave the bolt free. To effect this the sentinel bolts may either be
worked in connection with tumblers, levers, or slides to be acted upon by
the key, or by a projection on the barrel of the revolving curtain.
Figure 5 shows portions of a lock constructed according to this part
of our Invention. a is the lock plate; b, the bolt; c, the axis of the
tumblers; d, the keyhole; e, e, the sentinel bolts; f, f, the levers, and
springs which operate them; g is a piece connected with the levers f,f;
the tumblers when lifted come into contact with it and so cause the
sentinel bolts to be withdrawn.
Figure 6 is a section taken through the selvage of the lock on the
line 1, 1, Figure 5.
It will be seen that the sentinel bolts are so effectually protected by

page_text: by any agent which may be employed to destroy the more accessible
parts of the lock, and so long as the sentinel bolts remain the main bolt
cannot be moved.
In order to secure the bolt straps of safes, where two bolts or sets of
bolts are used, instead of securing only one strap with the bolt of the
lock we place the straps in such a position that when they are moved
outwards the lock bolt may come between them and so secure both
straps.
Figure 7 shows an arrangement in which the lock bolt shoots between
the front and back bolt straps and so blocks them.
What we claim is, our improvements in the construction of iron safes
and strong room doors, and in locks for the same and for other purposes,
substantially as herein described.
In witness whereof, I, the said George Hayter Chubb, have here-
unto set my hand and seal, this Twenty-first day of June, 1
in the year of our Lord One thousand eight hundred and seventy-
five.