IMPROVEMENTS IN LOCKS
Year: 1881

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex, for an
Invention of "IMPROVEMENTS IN LOCKS." A communication from abroad by
Ole Flagstad, of Hamar, in the Kingdom of Norway.
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 4th November 1881.
HERBERT JOHN HADDAN, of Kensington, Middlesex. IMPROVEMENTS IN
Locks." A communication from abroad by Ole Flagstad, of Hamar, in the
Kingdom of Norway.
This Invention relates to improvements in door locks, and consists essentially in
constructing such locks as follows:-The tube in which the axle of the latch moves
is connected with the latch by means of an arm and an intermediate lever, which
is secured to the said arm at one side and to the latch at the other." The latch is
horizontally guided by a shackle and a block, and is kept in position by a spiral
spring capable of yielding, if by depressing the handle the latch is drawn back into
the lock-case.
The tube in which the axle of the handle moves has a bottom provided with a
square opening and with a number of grooves or notches placed cross-wise to each
other, while the handle has a corresponding number of tappets fitting into the
grooves of the tube.
A square pin provided with female threads at its ends fits into the square
opening of the tube, and effects the shifting of the latch when the handle is
depressed.
The ends of said pin are made round and serve to receive the handles, the
tappets of the handles fitting into the notches of the latch tube as above described.
The handles are fastened to the axle-pin by means of two screws fitting into the
threads provided in said pin, and to the lock-case by means of rings and screws,
the handles being thus perfectly rigid.
This construction of handles may be applied to various doors without needing
alterations. The bolt of the lock is so constructed as to be secured in two positions

page_text: by a tumbler having a projecting pin, which alternately fits into two notches in
the bolt. Supposing, for instance, the bolt to be closed, the pin rests in the back
notch and keeps the bolt in its position. An additional hook is provided for
securing the tumbler, said hook being placed between the bolt and the case turning
on a pin and held by a spring. By turning the key the hook must first be shifted,
and only then the bolt is pushed back and the lock opened.
While the lock is open, the above described safety hook is held by another hook
and prevented from gearing with the tumbler, in order to allow of closing the bolt
if required.
A spring depresses the tumbler, and another spring is intended for stopping the
arm of the latch-tube if the door is slammed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the
4th May 1882.
HERBERT JOHN HADDAN, of Kensington, Middlesex. "IMPROVEMENTS IN
Locks." A communication from abroad by Ole Flagstad, of Hamar, in the
Kingdom of Norway.
This Invention relates to door-locks, and will be explained with the aid of the
accompanying Drawings, Figs. 1 to 4.
The lock comprises a bolt m (Fig. 1) and a latch a, which is moved by the
handle, represented in detail by Fig. 2, this handle being connected with the.
tube e, which serves to shift the latch a by means of an arm e and a link d pivoted
to the latch. The latter is guided horizontally by the strap a" and the block p,
it is pushed forward by a helical spring wound over a pin f as a core. If the
tube e is turned so as to withdraw the latch a into the casing, the spring fis
compressed. The bottom of the tube e has a square opening e" and four
grooves el placed at right angles and adapted to receive the lugs hill of the
handle h (Fig. 2). The central portion of the pin g (Fig. 4) is square, and fits
into the square opening e¹¹ of the tube e so as turn the latter and shift the bolt
when the pin is turned. On the round ends of this pin are mounted the handles h,
the lugs of which enter the grooves of the tube e above mentioned, the handle
being then secured on the pin by screwing the screws (Fig. 3) into the tapped
ends of the pin (Fig. 4). The rings k (Fig. 2) slipped on the sleeve of the handles
before placing it on the pin g, are then made to enter the corresponding openings
on the door-plate, and fixed to the handle by the screw r so as to afford a good
bearing and guide for the handle. These handles have the advantage that they fit
varying strengths of doors without being filed off. The bolt m of the lock may be
fixed in two positions by the tumbler situated above it, this being effected by a
pin of the tumbler entering one or the other of the recesses and 8 of the bolt.
The Drawing shows the lock closed, in which position the pin projects into the
receser so as to lock the bolt. A further locking action is obtained in this position
by a safety lever o situated between the bolt and the lock-plate A. This lever
turns on the pivot o", and is held in position by the spring v.
If the key S is turned to the left the recessed part o' of the bit pushes against
the lever o, and only after the latter has been disengaged at o can the tumbler
be lifted and the bolt withdrawn by means of the bit m'. When the lock has been
thus opened, the lever o is kept out of gear with o by the pressure of the hook
acting on the opposite end of o. Otherwise the bolt could not be again shot
forward by turning the key to the right. t is a spring for pressing down the
tumbler; b, a draw-spring which holds the arm e' of the tube e when the door is
violently closed.

page_text: 2. In locks, the combination of the bolt m with a safety lever o, which locks the
tumbler so that it cannot be lifted until the lever has been withdrawn.
The whole substantially as described and illustrated.
In witness whereof, I, the said Herbert John Haddan, have hereunto set my
hand and seal, this Fourth day of May, A.D. 1882.
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