A DOUBLE CHAMBERED LOCK WITH CYLINDERS, TO WHICH PINS ARE AFFIXED IN DIFFERENT DIRECTIONS INSTEAD OF WARDS
Year: 1799

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
"DAVIS, of Windsor, in the County of Berks, Locksmith, send greeting.
WHEREAS His most Excellent Majesty King George the Third did,
by His Letters Patent. under the Great Seal of Great Britain, bearing date
at Westminster, the Eleventh day of April, in the thirty-ninth year of His
reign, give and grant unto me, the said George Davis, His special licence,
'full power, sole privilege and authority that I, the said George Davis, my
executors, administrators, and assigns, or such others as I, the said George
Davis, my executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and at all times during the term of
years therein expressed, should and lawfully might make, use, exercise and
vend, within England, Wales, and the Town of Berwick-upon-Tweed, my
Invention of "A DOUBLE CHAMBERED LOCK WITH CYLINDERS, TO WHICH PINS ARE
AFFIXED IN DIFFERENT DIRECTIONS INSTEAD OF WARDS;" in which said Letters
Patent there is contained a proviso obliging me, the said George Davis, by an
instrument in writing under my hand and seal, particularly to describe and
ascertain the nature of my said Invention, and in what manner the same is to
be performed, and to cause the same to be inrolled in His Majesty's High
Court of Chancery within one calendar month next and immediately after
the date of the said Letters Patent, as in and by the same, reference being
thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
George Davis, do hereby declare that my said Invention, and the manner in

page_text: which the same is to be performed, is described and ascertained as follows,
that is to say:-
As security is the acquisition which every one wishes with respect to locks,
they ought to be so constructed as to defy (in particular) the common methods
used to violate that security, I have therefore endeavoured to render my
Invention or improvement fully competent to answer that end, and flatter
myself it will be found to counteract even more than ordinary ingenuity
when exerted for the purpose of counterfeit application. For this purpose
these locks are made with double chambers, consequently the key passes
through two apertures at different angles on one or both sides. These key-
holes are case-hardened barriers, which are varied in the lower entrance
from what appears on the top cap, on purpose to mislead and prevent any
improper means being used by the application of a false key. In the lower
chamber is a cylinder let into the plate of the lock, no way dependant on
the drill pin, on which are affixed stumps or pins in various forms and
directions, which are level with the under part of the lower cap. These go
through the end of the key (which is perforated to fit with great nicety) and
always stand opposite the key hole, to prevent entrance to anything but what
exactly corresponds with the varied position of these pins or stumps. Also
on the cylinder..are two locking pieces with springs, the ends of which bolt
through the plate, and must both be. liberated before the lock can be opened.
There is no particular situation for these locking pieces on the cylinder, as
they may be varied at pleasure, and made to act against any part of the
key which first enters the lower chamber. The old method of spring and
tumbler is exploded; instead of which there is a spring with a pin that
goes through the top of the bolt, and which spring cannot be discharged
without the rotative motion of the cylinder. It must here be particularly
emarked, that it is not solely the motion of the cylinder that will effect the
purpose, as that may be moved round and the bolt remain stationary. This
will be found an invincible obstacle to any illicit means that may be used
to open the lock without the key. The bolt and spring are so completely
boxed up, that there is no communication to them whatever but through
both key holes into the lower chamber, although their position is close to the
top cap.
In witness whereof, I, the said 'George Davis, have hereunto set 'my
hand and seal, this Third day of May, in the year of our Lord One
thousand seven hundred and ninety-nine.
GEORGE (L.s.) DAVIS.

page_text: AND BE IT REMEMBERED, that on the same Third day of May, in the
year above mentioned, the aforesaid George Davis came before our Lord the
King in His Chancery, and acknowledged the Specification aforesaid, and all
and every thing therein contained, in form above written. And also the Spe-
cification aforesaid was stamped according to the tenor of the Statute in that
case made and provided.