Improvements in Locks.
Year: 1898

page_text: Date of Application, 11th Jan., 1898-Accepted, 12th Feb., 1898
Improvements in Locks.
We, JULIUS HOLVERSCHEID, and HUBERT MENTZEN, both of Opladen, (Rhine
Province), in the German Empire, Manufacturers, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, reference being had to
to the accompanying drawings and to the letters and figures marked thereon, that
is to say:-
This invention relates to locks for doors, cupboards, boxes, and the like, and
which locks may, at the same time, form safety bolts.
Our invention will be readily understood on reference to the annexed drawings,
in which:
Fig. 1 is a side elevation of one form of our improved locks, the cover plate being
removed for sake of clearness.
Fig. 2 is a sectional view of a modification.
Fig. 3 is a further modification and,
Figs. 4 and 5 shew a slightly modified form of the lock shewn in Fig. 3 and in
its open, and in its locked, condition.
Figs. 6 and 7 shew the lock represented in Fig. 1, together with automatically
locking bolts, of the construction illustrated in Figs. 4 and 5, and applied to a
window shutter.
In the lock shewn in Fig. 1, the bolt or tongue a is formed with a slot f by means
of which it is guided in its forward, or backward, movement over a pin g fixed to
the casing or box. The rear end of the bolt is cut away at an angle, as shewn, but,
if desired, it may be straight. Against this angular end rests a tumbler cam or
tappet d pivotted on a pin e fixed in the casing. To shoot the bolt the tumbler
cam or tappet is turned on its pivot by means of a suitable key, and owing to its
eccentric movement it pushes the bolt outwards, as indicated in dotted lines, until
the rear end of the slot f abuts against the stop g and prevents further movement.
The bolt is retained in its locked position by the straight side of the tumbler cam
or tappet resting against its angular part . By turning back the tumbler cam or
tappet slightly, by means of the key, the spring 6 throws the bolt back. Said spring
is mounted on a pin c fixed to the front of the lock casing. On the forward move-
ment of the bolt, a lug or extension h, receiving the free end of the pin c, compresses
the spring which, on the tumbler cam or tappet being released, restores the bolt
to its normal position. The return movement of the tumbler cam or tappet is
limited by a stop s fixed to the inner side of the lock-casing and against which the.
tumbler cam or tappet rests.
Fig. 2 shews a modified form of lock adapted to be used either as a double-
bolted lock, or as a locking bolt. This arrangement, notwithstanding its two bolts,

page_text: b
is of exceedingly simple construction. The two bolts n are each provided with
inclined tail pieces (of like or different sizes) which are arranged end to end and
abut one against the other. In the wedge like opening formed between the tail
pieces the tumbler cam or tappet d is located. This latter carries on its outer face
the pivot pin e for the reception of the key which is inserted through the key hole
pipe fixed to the cover plate, and said tumbler or cam is, by this means, guided and
kept in proper place. Around each bolt is a spiral spring 6 pressing against guide
plates r, r, through which pass the outer ends or heads of the bolts. The locking is
effected by turning the tumbler cam or tappet d, by means of the key, until it takes
up the position shewn in dotted lines. In this position the direction of the pressure
exerted by the tumbler cam or tappet on the inclined tail pieces passes nearly
through the geometrical axis of such tumbler, and it requires but a slight reverse
movement of the tumbler cam or tappet before the bolts can be returned by their
springs b. The bolts move outwardly through the guide plates r, r, and pass
through lugs a, a², secured to the staple plate which is fixed to the part to be
retained locked (door, window, box, or the like).
On turning the tumbler cam or tappet d backwards, the bolts are returned to their
initial position, by the action of the springs.
.
Fig. 3 shews an arrangement of single bolt n provided with an inclined or wedge-
shaped tail piece m' enclosed in a casing. The tumbler cam or tappet 7 is here
shewn in the form of a lever pivotted at 2 and having an arm o which passes
through a slot s¹ in the casing. When the bolt is in its normal position the tumbler
cam or tappet is thrown back and rests with its curved face on the inclined tail
piece m', but, on being operated, such curved face slides over the incline m¹ and
moves the bolt forwards until its nose engages behind the end of the bolt and so
retains it in its locked position. On releasing the tumbler cam or tappet the spring
draws the bolt inwards.
Figs. 4 and 5 shew nearly the same arrangement as in Fig. 3, the difference being
that the arm is dispensed with and a pin r guided in a sleeve is used in its stead.
By applying pressure to the outer end of the pin, its head u is caused to slide along
the inclined tail piece of the bolt a¹ and force the same outwards. The tension of
the spring on the bolt causes this latter to return to its normal position.
It is obvious that the details may be further varied without departing from the
nature of our invention.
Figs. 6 and 7 shew, by way of example, the invention applied to a window
shutter.
A indicates the lock, say the one shewn in Fig. 1, B the locking bolts shewn in
Figs. 4 and 5, and w the operating pins projecting from the shutter.
y
The shutter E is first closed and the batten z of the second shutter is brought
against it, thus depressing the pins w and causing the bolts a¹ to enter the frame
and so help to fasten the shutters. The main lock A is then operated and, in this
manner, a reliable, easy, and practical triple lock is provided, while it is only
necessary to operate but a single lock.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that we claim :-
"
1. A lock having its bolt formed with an inclined (or straight) rear end (such
as x) adapted to be thrown or shot by the movement of a pivotted tumbler cam or
tappet arranged in contact with such inclined end, and which tumbler cam or
tappet serves to shoot and retain the bolt, said bolt being restored to its normal
position by a spring directly the tumbler cam or tappet is released, substantially
as described.
2. A lock, as above claimed, provided with two bolts arranged end to end and
having inclined tail pieces (of like or different sizes) adapted to be shot outwards
by a tumbler cam or tappet located between them, thus forming a double-bolted lock,
substantially as described.

page_text: 3. Our improved locks, forming also safety bolts, substantially as herein before
described and shewn in the annexed drawings.
Dated this 11th day of January 1898
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 5A, Market Street, Nottingham,
Agent for the Applicants.