An Improved Lock.
Year: 1889

page_text: Date of Application, 3rd May, 1889
Complete Specification Left, 24th Sept., 1889-Accepted, 4th Jan,
1890
PROVISIONAL SPECIFICATION.
An Improved Lock.
I REGINALD HADDAN of the firm of Herbert & Co of 18 Buckingham Street
Strand W.C. London in the County of Middlesex, Civil Engineer do hereby declare
the nature of this invention, a communication to me from abroad by Heinrich
Ludwig of Schweinfurt, Bavaria in the Empire of Germany, Manufacturer to be
as follows:-
The improved lock comprises the following parts. In the lock casing are guided
two bolts which may be respectively termed, the locking bolt and the latch bolt, the
locking bolt is bifurcated at the end the two ends so formed, projecting from the front
Tim of the lock case. The latch bolt is guided in the body of the main bolt its
bevelled end projects from the rim between the bifurcated ends of the main bolt and
is held projected by a spring The locking bolt may be moved back and forth by
hand through a rocking lever having a pin engaging in a notch in the bolt and
On the lock plate
moved by the square of the usual knob or handle or by a key
is vertically guided (the bolts being considered as horizontal) a plate serving as
a tumbler plate, this plate is provided with a slot in which a tappet on a rocking
pin engages, the slot being of such a shape that the tappet may be turned to lift
the plate or to lower the same, and that the tappet may support the plate when
in its uppermost position On the rocking pin of the above tappet is a second
tappet which is adapted by its movement to operate at certain times a bow shaped
plate pivoted on the locking bolt and controlling the latch bolt in
hereinafter referred to. The rocking pin of the tappets is preferably adapted to
be turned indirectly only by a suitable key On the tumbler plate is a vertically
sliding block guided partially by a sliding pin and controlled by a spring tending
to press it downward
a manner
When the door is locked the tumbler plate is in its lowest position with the
block descended just behind the end of the main bolt To unlock the lock, the
tumbler plate is raised and the locking bolt may then be moved by turning the
knob back under the block aforesaid. The raising of the first tappet to raise
the tumbler plate will have also raised the second tappet to stand out horizon-
tally and this tappet will meet the advancing bow lever pivoted on the locking
bolt and retard the upper end thereof, advancing further the lower end and so
drawing back the latch bolt by the action of this lever on the mner end of said
bolt. The locking bolt carries a spring pin with rounded head which when the bolt
is fully drawn back will engage in a recess in the lock casing with power sufficient
to hold back the main bolt until exterior force is applied thereto to lock it again.
In such unlocked position of the locking bolt the latch bolt may be drawn and
shot as desired by the second tappet and the bow lever. The movement of the
tumbler plate which occurs by the simultaneous action of both tappets is per-
mitted by the elastic arrangement of the tumbler block which arrives against the
upper face of the main bolt. When the locking bolt is projected, the bow lever,
pivoted on it is carried out of reach of its tappet and the latch bolt becomes
substantially a part of the locking bolt.
D
T
CM 1000
HERBERT & Co.,
Agents to Applicant

page_text: COMPLETE SPECIFICATION
An Improved Lock.
1 REGINALD HADDAN of the firm of Herbert & Co of 18 Buckingham Street,
Strand, London WC, Civil Engineer do hereby declare the nature of this invention
a communication to me from abroad by Heinrich Ludwig of Schweinfurt, Bavaria in
the Empire of Germany, Manufacturer and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
The invention relates to improvements in locks and more particularly to locks of
safes and has for its object to afford means to move two distinct bolts, which may be
respectively termed the locking bolt and the latch bolt at option simultaneously or
seperately. The locking bolt is bifurcated at the end, the two ends so formed pro-
Jecting from the front rim of the lock case. The latch bolt is guided in the body of
the main-bolt, its bevelled edge projects from the rim between the bifurcated ends of
the main or locking bolt and is held projected by a spring. The locking-bolt may be
moved back and forth by hand through a rocking lever having a pin engaging in a
notch in the bolt and moved by the square of the usual knob or handle
The improved lock is represented in the accompanying drawings:
Fig. 1. shows the lock when open,
Fig 2. with the latch bolt advanced,
Fig. 3. shows the lock when shut,
Fig 4. is a vertical section of the lock in the position of Fig 3,
Fig. 5. is a horizontal section of the lock in the position of Fig 3.
The bolt A provided with the bifurcated heads A¹ and A' is moved to and fro by
means of the pinion C. The rotation of the pinion C depends upon the tumbler,
which consists of a bed-plate G and the stop-bolt G. Upon the tumbler the
rocking pin Facts, when turned within the lock, the tappet of the rocking pin
resting within the notch g of the bed plate G of the tumbler and serving to shift up
and down along the guiding pins of the ground plate G with its vertical slots.
This pin F situated within the lock cannot be reach direct from without. Its rotation
is derived in an optional manner from the motion of some special lock forming no part
of this present invention and arranged without for which may be used an ordinary
key, which can be withdrawn
The
The pin F has also a second tappet f', which operates the double arm lever E.
This lever E, revolves on a pin a secured to bolt A and it is used at the corresponding
position of the tappet f¹ to withdraw the latch D and to keep back the same
head of the latch D is situated between the bolt heads A and Awhilst-its-shaft is
partly inserted into the bolt A and finishes with an arm d upon which acts the lever E.
The spiral spring drests partly upon a projection of the latch D and partly on the
guiding pin B of the bolt and tends to push forward the latch D.
If as represented in Fig. 1. the lock is opened, the tappet f keeps the bed plate G
of the tumtler in its highest position The stop bolt G' has a cylindrical projection
with which it can be moved within a hole in the pin g' arranged in the bed plate G.
The spiral spring g' presses the stop bolt G¹ away from the pin g'. The stop bolt G¹
has besides, two opposite projections 93 one of which is guided in a slot in the lock
box cover, whilst the other one is guided in a slot of the bed plate G.
The slot in the bed plate G only reaches so far below that in the position shown by
Fig. 1 the stop bolt G¹ is some distance above the bolt A. The bolt A is shifted
quite back in Fig. 1 by the rotation of the pinion C. The lever c, connected thereto
carries a pin c¹ which is inserted into the slot a² of the bolt A. The bolt A is secured
in its withdrawn position by the domed head of the pin a' forced by a spring aª against
the lock plate and entering a cavity a' (Fig 5) of the lock plate
The latch D is kept entirely back because the upper arm of the lever E presses itself
against the almost horizontal tappet f' and in consequence thereof the lower part of
the lever E presses back the arm d of the latch D. On turning the wards of the

page_text: pin F as indicated by dotted lines in Fig. 1 downwards about 90° the spring d
shifts forward the latch D*, the arm d¹ presses against the lever E so that its
upper arm enters the notch f' (Fig. 4) of the key F and the bed plate is
lowered into its lowest position. The stop bolt G₁ can only follow partly in this
motion because it pushes against the bolt A and rests upon the same. In this
position of the mechanism explained by Fig. 2 the latch D only acts and the lock
can be shut by slamming in the known manner
In order to then withdraw the latch D by the action of the lever E the tappets ƒ ƒ
are turned back into the dotted position in Fig. 2. If its is wished to push
forward the latch D and the bolt heads A A' to shut thoroughly the lock as represented
in Fig 3 the bolt A is moved forward by turning the pinion C and the tappets ffi
are turned down The stop bolt G' is then pressed behind the bolt A by the spring g³
and secures the same against withdrawal.
The withdrawal of the bolt A and of the latch D by means of pinion C can only be
effected when the tappets ff' have been previously turned upwards into the position
indicated in Fig. 1.
Having now particularly described and ascertained the nature of said invention
and in what manner the same is to be performed, I declare what I claim is
The improved lock consisting of the rocking pin F with its tappets fand ¹ lever E,
bolt A and latch D with devices for operating the same all substantially as illustrated
and described for the purpose set forth.
Dated this 94th day of September 1889
HERBERT & Co.,
18, Buckingham Street, Strand, London, W C., Agents to Applicant.