IMPROVEMENTS IN DOOR AND OTHER LOCKS
Year: 1858

page_text: LETTERS PATENT to George Frederick White, of Mark Lane, in the
City of London, Merchant, for the Invention of "IMPROVEMENTS IN DOOR
AND OTHER LOCKS."
Sealed the 14th August 1858, and dated the 23rd February 1858.
PROVISIONAL SPECIFICATION left by the said George Frederick White
at the Office of the Commissioners of Patents, with his Petition, on the
23rd February 1858.
.. I, GEORGE FREDERICK WHITE, of Mark Lane, in the City of London,
Merchant, do hereby declare the nature of the Invention for "IMPROVE-
MENTS IN DOOR AND OTHER LOCKS," to be as follows:-
This Invention has for its object, improvements in door and other locks.
For these purposes each lock is constructed with two bolts, which are
capable of being connected or geared together in such manner that when one
is pressed back or unlocked, the other is pressed out from the lock. Ordinarily,
only one bolt is used, and so long as such is the case the lock acts as an ordi-
nary lock with one bolt; but when it is desired to prevent the lock from being
opened by a correct key, or a pick-lock introduced through the key-hole from
the exterior, then the two bolts are connected or geared together, so that any
action to: unlock or move back one bolt, 'will' have the reverse effect on the
second bolt, and cause it to be moved out of the lock as the ordinary bolt is
moved into the lock, and the lock can only be unlocked by separating the two
bolts....:
}

page_text: Locks thus constructed with two bolts may be arranged with wards or
tumblers, and other parts, to increase the security thereof, in like manner to
other locks where only one bolt is used to each lock.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Frederick White in the Great Seal Patent Office
on the 23rd August 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
FREDERICK WHITE, of Mark Lane, in the City of London, Merchant, send
greeting.
WHEREAS Her most. Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of February, in the year of our
Lord One thousand eight hundred and fifty-eight, in the twenty-first year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said George Frederick White, Her special licence that I, the said
George Frederick-White, my executors, administrators, and assigns, or such
others as I, the said George Frederick White, 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 DOOR AND OTHER LOCKS," upon the condition
(amongst others) that I, the said George Frederick White, my executors or
administrators, by an instrument in writing under my, or their, or one of
their hands and seals, 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 Frederick White, 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:-
This Invention has for its object improvements in door and other locks.
For these purposes each lock is constructed with two bolts, which are capable
of being connected or geared together in such manner that when one is
pressed back or unlocked the other is pressed out from the lock. Ordinarily,

page_text: end of one arm of the lever f slides when the tumbler is lifted by the key
and the pin e slides in the slot 6" when the tumbler 6 is carried back by the
bolt a.
The lever turns on a fixed centre at g, and in the end of the other
arm of the lever f there is a slot, through which a pin on the second bolt h
passes if the tumbler b is not moved into such a position that the pin e is
opposite the slot 6" before any pressure is applied to the bolt a, so as to move
it back, the lever f turns on its centre, and forces the second bolt h out from
the lock. And in order further to increase the security of this lock, there is
another tumbler i, which turns on a fixed center, on which tumbler there is
a stump j, and in the end of the tumbler 6 and the end of the bolt a there is a
notch, into which the stump j on the tumbler i enters when the bolt is shot
back or unlocked, so that both the tumbler 6 and the tumbler i must be
correctly placed by the key before the bolt can be shot back, and in the back
of the bolt a and the tumbler 6 there are also a number of false notches,
which are not so deep as the true notches, and if the stump j does not enter
the true notch in the bolt a, the bolt a cannot be moved back far enough for
the lock to be unlocked, and if the stump j does not enter the true notch in
the tumbler b the second bolt h is forced out from the lock when the bolt a
is moved back, as above explained. There is also another set of tumblers
which turn on the pin k, and which are acted on by the key as in ordinary
tumbler locks.
'Having thus described the nature of my Invention, and, the manner of
performing the same, I would have it understood that what I claim is, the
constructing locks with two bolts, only one of which is ordinarily acted on by
the key, but which are capable of being connected together in such manner
that when one is pressed back or unlocked the other is pressed out from
the lock.
In, witness whereof, I, the said George Frederick White, have hereunto
set my hand and seal, this Twenty-third day of August, in the year
of our Lord One thousand eight hundred and fifty-eight..
Witness,
S. CARPMAEL....
-=
GEO. F. WHITE. -(L.S.)