IMPROVEMENTS IN SAFES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Harry Withers Chubb at
the Office of the Commissioners of Patents on the 11th Jane 1883.
"
HARRY WITHERS CHUBB of 128 Queen Victoria Street in the City of London
IMPROVEMENTS IN SAFES
"
This Invention has for its object improvements in safes.
I use to form the main frame of a safe a rolled bar of iron of a trough like
section and so formed as to stiffen the outer body of safe. The plates are attached
either on the inside or outside to the outer side or member of the frame and the
inner side is so formed as to provide a recess or rebate into and against which the
door or lid is closed and behind which member the main bolts of the door or lid
are projected to take their hold. The inner lining of safe is attached either
directly or indirectly through the medium of a separate lining flange to the rebated
member.
Bar iron of this section may be made into a square cornered frame but by
preference the frame is forged round at the outer corners in such a manner as to
keep each corner of the recessed or rebated portion square.
To insure a tight closing I introduce strips of packing on the rebates of the door
or the surface against which it closes and I provide a lever or handle on the
exterior of safe so arranged as to operate against an inclined plane attached to the
door thereby effectually closing the door tight against the packing.
To prevent conduction of heat to the interior of the safe I form the inner part
of the door of a frame or panel of wood which is by preference treated chemically
to resist fire and heat or I insert other suitable rigid non-conducting material
between the bolt work chamber and the chamber holding the non-conducting
material.
The interior lining of the safe and back of the door may also consist of wood
likewise chemically treated.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Harry Withers Chubb in the Great Seal Patent Office on the
10th December 1883.
"
HARRY WITHERS CHUBB of 128 Queen Victoria Street in the City of London
IMPROVEMENTS IN SAFES
"
This invention has for its object improvements in safes.
I use to form the main frame of a safe a rolled bar of iron of a trough like
section and so formed as to stiffen the outer body of safe. The plates are attached
either on the inside or outside to the outer side or member of the frame and the
inner side is so forined as to provide a recess or rebate into and against which the
door or lid is closed and behind which member the main bolts of the door or lid
are projected to take their hold. The inner lining of safe is attached either
directly or indirectly through the medium of a separate lining flange to the rebated
member.
Bar iron of this section may be made into a square cornered frame but by
preference the frame is forged round at the outer corners in such a manner as to
keep each corner of the recessed or rebated portion square.
To ensure a tight closing I introduce strips of packing on the rebates of the door
or the surface against which it closes and I provide a lever or handle on the
exterior of safe so arranged as to operate against an inclined plane attached to the
door thereby effectually closing the door tight against the packing.
To prevent conduction of heat to the interior of the safe I form the inner part
of the door of a frame or panel of wood which is by preference treated chemically
to resist fire and heat or I insert other suitable rigid non-conducting material
between the bolt work chamber and the chamber holding the non-conducting
material.
The interior lining of the safe and back of the door may also consist of wood
likewise chemically treated.
The annexed Drawing shews an horizontal section of a portion of a safe
constructed in accordance with my invention.
A is the door frame of the safe formed of a bar of trough like section; to it the
side, top and bottom plates of the safe are rivetted.
B is one of the outer plates of the safe.
C is an inner frame to carry the inner lining D of the safe. The lining may be
of wood and the wood may advantageously be prepared in any well known manner
to render it incombustible.
E is the front plate of the door, immediately behind it is the cavity for the lock;
one of the bolts of the lock is indicated by dotted lines.
F is a cover of wood closing the lock cavity at the back and behind this again is
a case G formed of a light iron frame G₁ and a wooden panel G2; it is intended to
be filled with non-conducting material. The double sides of the safe are also
charged with non-conducting material.
At H I provide a soft packing it may be felt nipped between the parts C
and D; the door closing against the packing forins a dust-excluding and
water-tight joint.
The door frame is formed by preference with rounded corners.
To form the curved corner a notch or mitre is cut in the bar leaving however
the outer flange intact and uncut. The bar is then heated and the flange left
undivided is bent round to a curve of about one inch and a half radius. The metal
may (or may not) be welded up to complete the corner,

page_text: Having thus described the nature of my said invention and the manner of
performing the same I would have it understood that I claim as my invention of
improvements in safes forming the main frame of a rolled bar of trough like
section having a recess or rebate to receive the edge of the door or lid substantially
as herein described.
In witness whereof I the said Harry Withers Chubb have hereunto set my
hand and seal this tenth day of December in the year of our Lord One thousand
eight hundred and eighty three.
HARRY W. CHUBB (L.S.)