IMPROVEMENTS IN LOCKS
Year: 1860

page_text: PROVISIONAL SPECIFICATION left by Richard Archibald Brooman at the
Office of the Commissioners of Patents, with his Petition, on the 19th
June 1860.-A communication from abroad by Auguste Theodore
Baudrit, of Paris.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN LOCKS," (commmunicated to me from abroad by Auguste
Theodore Baudrit, of Paris,) to be as follows:-
This Invention consists in certain new arrangements of parts, which will be:
best understood by reference to the accompanying Drawings.
Figure 1 shows the inside of a lock complete; Figure 2 shows a winged
piece worked by a button or knob on the outside for drawing back a lock bolt
or catch; Figure 3 is a longitudinal section of Figure 2, with the addition of a
safety apparatus; Figure 4 is a section of a sliding screw catch provided with a
safety apparatus; Figures 5 and 6 show the key spindle in detail, and.
Figures 7 and 8 are two arrangements for preventing dirt entering the body.
of the key.
I now commence to describe the most simple arrangement of lock, and will
finish with an unpickable lock. The sliding screw catch, Figure 4, consists of a
round bolt a, the end of which is double-chamfered; it is moved by a helical

page_text: spring b, and is placed in a cylindrical box c. A recess r is made in one of
the chamfered faces, which forms a stop on the staple; a pressure screw dis
fitted upon the inner face of the box c, and serves to stop the bolt at any point
to keep it entirely back, and to prevent its being forced back or withdrawn at
will; the box c is received in a metal eye q for receiving the key and a safety
apparatus. The arrangement allows of the entrance into the lock being
placed in the centre of the door frame, and, instead of a simple screw, of fitting
a safety apparatus for giving motion to the screw, as shown at Figure 4.
This apparatus consists of a circular disc e placed over another ffrom which
it is kept separated by a screw, a projection from the disc e is caused by the
pressure of the key to enter a notch h, in the plate f. Under the action of the
key this plate turns, and drives the screw forward and backward as required.
At Figure 7 the piston B is shown screwed into the key, and at Figure 8 it
is not intended to be separated from it. In the first case it is necessary to
unscrew and remove the piston before use; in the second the pressure upon
the lock spindle drives it, and allows of the key acting. In Figure 2 the form
and position of the wings h, k, are shown; 1, l, are abutments on the bolt against
which the wings act to draw back the bolt; as shewn at Figure 3 a safety
apparatus may be applied to this lock, similar to that shewn and described
with reference to Figure 4, or a stop m may be applied, instead of that;
Figure 1 shews the arrangement for an unpickable safety lock. In an ordinary
lock frame n, a bolt with a rack p is placed. A catch a' is also fixed
in the frame, and a screw m is used for keeping it open or closed; a toothed
latch also prevents the catch being forced back or allows it free play, but
requires the key for moving it. The mechanism of this lock, see Figure 1, and
the detached views, Figures 5 and 6, consists of three discs or plates, that is, of
the discs e and f, Figures 3 and 4, and of a third and top plate H, which is
toothed. The bottom disc f is traversed by a spindle i, and has on its upper
surface a number of springs s; tie pieces connect the disc e to the disc f; the
lise e is open in the centre to allow of the spindle passing through it, and
carries as many mortices on its surfaces as there are movable blades resting
upon the springs. The upper plate H rests upon e; it also allows passage to
the spindle through it, and has mortises to engage into the movable blades; it
also carries teeth to drive the bolt o and latch r. This is the action of the
lock; the key is similar to that before described; on being inserted the
wards coincide with the movable blades, which fill the mortises in the disc
H; these drive them back into the mortises in the disc e, and hold them
there; on turning the key, the plate H being released follows the impulsion of

page_text: the key, and the teeth drive the bolt o, which through an incline on its side
drives the latch r, which entering behind the catch a prevents it being
pushed back. The stop screw may be used instead of the latch to fasten the
catch. In order to obtain a greater throw of the bolt o, I increase the length
of the rack as shewn at Figure 9; I use parts of these locks for securing or
bolting French casements, shutters, sashes, and such like structures.