IMPROVEMENTS IN LOCKS
Year: 1852

page_text: LETTERS PATENT to Joseph Rose, Foreman and Manager to John
Leadbeater, of Aldersgate Street, in the City of London, Lock
Manufacturer, for the Invention of "IMPROVEMENTS IN LOCKS."
Sealed the 30th March 1853, and dated the 21st October 1852.
PROVISIONAL SPECIFICATION left by the said Joseph Rose at the
Office of the Commissioners of Patents, with his Petition, on
the 21st October 1852.
1, JOSEPH ROSE, Foreman and Manager to John Leadbeater, of
Aldersgate Street, in the City of London, Lock Manufacturer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
Locks" to be as follows:-
My Invention consists in improvements on Chubb's lock, and has
for its object the production of a lock which cannot be picked. At
the back of the tumblers I place strong springs, one spring for every
tumbler. The pin upon which the back ends of the tumblers work is
inserted into the short arm of a bell crank lever, whose fulcrum is fitted
to the frame of the back, immediately above the pin on which the back
ends of the tumblers work; the long arm of the lever is prolonged
parallel with the bolt, and terminates in a projecting piece corresponding
with a slot made in the top of the bolt of the lock. On any attempt being
made to force back the bolt the short arm of the bell crank lever would

page_text: be carried back, and the long arm with its projecting piece would be
brought down, and would effectually prevent the bolt being pressed
back by the projecting piece fitting into the slot or aperture made for
its reception in the bolt. On pressure being withdrawn from the bolt
the springs would force back the tumblers, and with them the short arm
of the lever, and consequently raise the projecting piece on its long
arm out of the slot in the bolt, and thus leave it in a fit state to be
opened by the proper key of the lock.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Joseph Rose in the Great Seal Patent Office on
the 21st April 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JOSEPH ROSE, Foreman and Manager to John Leadbeater, of Alders-
gate Street, in the City of London, Lock Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-first day of October, in the
year of our Lord One thousand eight hundred and fifty-two, in the six-
teenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Joseph Rose, Her special licence that
I, the said Joseph Rose, my executors, administrators, and assigns, or
such others as I, the said Joseph Rose, my 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 and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN LOCKS," upor the
condition (amongst others) that I, the said Joseph Rose, by an instru-
ment in writing under my hand and scal, 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 Joseph Rose, do hereby declare
the nature of my said Invention, and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the
following statement thereof, reference being had to the Drawings here-
unto annexed, that is to say:
My Invention consists in improvements in locks, and has for its
object the production of a lock which cannot be picked.
Figure 1, of the Drawings hereunto annexed represents a lock fitted
with my improvements. A, is the case of the lock, and B, the tumblers,
at the back or top of which I place the springs C, one spring for every
tumbler. The pin a, upon which the back ends of the tumblers work,
is inserted into the short arm of a bell crank lever D, the fulcrum of
which is fitted to the frame or case A, of the lock, and immediately
above the pin a. The long arm of the lever is prolonged parallel with
the bolt E, and terminates in a projecting piece b, corresponding with
the notch c, made in the top of the bolt E. On any attempt being
made to force back the bolt of the lock the short arm of the bell crank
lever would be carried back, and the tumblers with it, while the long
arm with its projecting piece would be brought down into the notch in
the bolt, as shewn at Figure 2, and effectually prevent the bolt from
being forced back. On pressure being withdrawn from the bolts the
parts would resunie their original position, as in Figure 1.
.
Figure 8, represents a separate view of the bolt E, and bell crank
lever D, shewing their positions in respect to each other.
And having now described the nature of my said Invention, and the
manner in which the same is to be performed, I declare that I claim,-
The improvements in locks, whereby the bolt is prevented from being
forced back, as herein-before described and represented in the Drawings
hereunto annexed.
In witness whereof, I, the said Joseph Rose, have hereunto set my
hand and scal, this Twenty-first day of April, One thousand
eight hundred and fifty-three.
JOSEPH ROSE. (L.B.)