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Патент USA US2113672

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April 12, 1938.
Filed Dec. 4, 1955
3 Sheets-Sheet 1
April 12, 1938-v
Filed Dec. 4, 1935
3 [Sheets-Sheet 2
April 12, 1938'.
Filed Dec. 4, 1935
3 Sheets-Sheet 5
Patented Apr. 12, 1938
Carl Martten Bidefeldt, Stockholm, Sweden
Application December 4, 1935, Serial No. 52,849
In Sweden July 18, 1934
1 Claim.
This invention relates to a door lock of the
kind having a lock bolt which can be operated
by the door handle after it has been partly re
tracted by means of a key, and wherein means
5 are provided for operating an alarm signal in
case an attempt should be made to open the look
by means of a false key or to force the lock bolt
into the lock.
The invention consists in the ?rst place in the
10 provision of a catch adapted to retain the look
bolt in retracted position; and key-operated
means for releasing it.
The lock is also provided with a tumbler or
tumblers adapted to yield pivotally to pressure
15 on the lock bolt from the outside, and of means
for operating the alarm under the in?uence oi
such yielding movement.
The invention is illustrated by way of example
in the accompanying drawings.
Fig. 1 represents a side view showing the in
terior of the lock,
Figs. 2 and 3 are views showing parts of the
mechanism in di?'erent ‘positions,
Fig. 4 is a section on the line IV-—IV of Fig. 1,
Fig. 5 is a view like Fig. 1 with several parts
of the mechanism removed, '
Figs. 6 and 7 are sections on the line VI-VI
and VII—-VII respectively of Fig. 5, and
Fig. 8 is a diagram of the signalling circuit.
The lock mechanism is enclosed in a casing
having side walls I and 2, a front wall 3, and a
rear wall 4. A latch bolt 5 is guided in known
(Cl. 200-55)
armed lever which turns about a pivot 30’ and
is controlled by a spring 29. The other arm 30
of the lever bears, under the in?uence of the
spring as, against a projection 3i on the latch
spindle 8.
In the top side of the tailpiece I9
there is a notch 32 into which a catch 34 is
adapted to snap in a given position of the lock
bolt as will be later described. The catch turns
about a pivot 34’ and is controlled by a spring
33. In the bottom side of the tail piece there is 10
a notch 35 into which a catch 3‘! is adapted to
snap with either of its two teeth 38 and 39 in a
manner which will also be described later. This
catch moves about a pivot 3i’ and is controlled
by a spring 35. The lower end of the catch 31
is ?tted with two arms 38' and 39’ which co
operate with the supporting pin ll’ of the spring
I I for limiting the movement of the catch.
A bell crank 40, 4i is pivotally mounted on a
pin 42 and controlled by
spring 43. One arm 56
co-operates in a manner later to be described,
with the projection 22 of the lock bolt Ill. The
other arm bears, under the influence of the
springs 43, against the free end of a cup~shaped
lever 44 which turns about a pivot 115 and is con 25
trolled by a spring 46. The lever 45:! carries a ball
41 and is capable of placing said ball in a posi
tion where it partly projects through an open
ing 48 in the wall 3 of the lock casing.
The tumblers 25 are mounted on a common 30
pivot pin 49 and are controlled by springs 50
which tend to hold them in contact with a sup
manner in an aperture in the front wall 3 and
porting pin 55, i. e., in the position shown by
controlled by a spring 6. The latch spindle 8 is
solid lines in Fig. 5.
In addition to the arm 23
35 supported in a bearing 9 and carries an arm ‘I
each tumbler has two arms E32 and 53 which are 35
by means of which the door handle (not shown)
is connected to the latch bolt. The lock bolt in
is controlled by a spring I I and guided by a heel
I2 connected to the wall I. It can be shot and
40 retracted either by means of an outer key I 4 in
serted through a key-hole I3, or by means of an
parallel to the arm 2t and adapted to eo-oper
ate in known manner with the keys
and I6.
In one of the tumblers the arm 28 is replaced by
a blade spring 26’ which is somewhat longer than
inner key I 6 inserted through a key-hole I5.
The lock bolt I ll has a tail piece I9 which is
provided with an opening 29 forming two abut
45 ments I1 and I8 for engagement with the key
I4. An abutment 2l~is provided at the lower
edge of the tail piece for co—operation with the
key I6. On the upper edge of the lock bolt Ill
there is a ?at projection 22 which is secured to
50 the bolt by means of a ?ange portion 23. The in
wardly directed edge of this projection has a re
cess 24 in which the tumblers 25 of the lock en
gage with their arms 26. Another projection 27
on the lock bolt co-operates, for a purpose later
55 to be described, with one arm 28 of a double
the arm 26 and which serves a purpose later to
be described.
Mounted on a pivot ?ll in the upper portion
of the lock casing is a double-armed, ?at lever
55, 56 which tends, under the influence of a spring
or merely by friction, to remain in any position
into which it is moved. The lower arm 55 of the
lever is located in the path of the upper ends
of the tumblers 25, and the other arm can be
made to bear against a contact 51 to which the
lead of an electric signalling device is connected.
The part 58 of the lead situated within the lock
casing, is carried by an insulator 59 of suitable
The signalling device comprises an electric bell
60 one terminal of which is connected to a bat 55
tery (ii. The other terminal is connected to a
lead £2 with a bar 63 Which is secured to the
door frame and which makes contact with the
lock bolt ill in the closed position of the door.
The battery 51 is further connected. through a
lead 64 with a blade spring 65 which is connected
to the door frame and which is adapted to make
contact with a blade spring 66 on the door when
the latter is closed. The spring 66 is connected
10 by a lead 6'! to the lead portion 58 located with
in the lock casing. Thus, when the door is
closed, the signalling circuit extends through the
parts it, 22, ‘iii, 25, 55, 56 and will be closed by
contact between the parts 56 and 51 in case of
15 an attempt to open the lock forcibly or by means
of a false key. A rod 68 shown in Fig. 1, can
be inserted into the lock through an opening 69
in the wall 3 for restoring the lever 55, 56 to its
normal position (Fig. 1) if the lever should for
one reason or another have been shifted from
this position.
Fig. 1 shows the door closed.
Both bolts are
completely shot, and the ball 41 is held by the
door frame in depressed position within the look.
If the door is to be opened from the outside, the
key M is given one part'turn and the key, by co
operation with the abutment l8, moves the lock
bolt into the position shown in Fig. 2 where it is
retained by the catch 34 which for this purpose
engages in the notch 32. On the door handle be
ing thereupon depressed, the arm 1 causes the
parts 3i, 30, 28, and 21 as well as the two bolts
to be retracted until the bolts are ?ush with the
wall 3. The catch 34 moves into the position
shown in Fig. 3 and disengages the bolt Ill. If
now the door is opened, the lever 44 moves the
ball 4? into the outer position shown in Fig. 3,
and the arm 46 is moved by the spring 43 into
engagement with the opposite edge of the pro
4:0 jection 22, so that the bolt ID will be retained in
retracted position. On the door being reclosed,
the ball M will be pushed back by the door frame
so that the bell crank 40, M will be disengaged
~from theprojection 22, and the lock bolt ID will
again be shot by the spring I l, the other elements
being also restored to the position shown in Fig.
1. Should it be desired to retain the lock bolt in
retracted position while the door is closed, the
bolt is is, after the door has been opened, pushed
by hand a little further into the lock, so that the
tooth 38 of the catch 37 will engage in the notch
35 and secure the bolt in the position shown in
Fig. 3. In this movement of the catch, its lower
arm 39’ strikes against the pin H’ and prevents
the clockwise movement which the catch would
otherwise perform under the influence of its own
spring as well as of the spring H acting through
the medium of the bolt 10‘. In order to release
the bolt from the catch 31, the catch must be
60 turned anti-clockwise by means of the key i5
until the tooth 33 slips out of the notch 35, where
upon the bolt !9 will be shot by the spring I I. If
the door is closed the bolt will move into the posi
tion shown in Fig. 1; if the door is opened the
bolt will move as far as the bell crank 40, 4| will
a low.
The opening of the door from the inside can be
effected by means of a handle after the bolt ID
has been moved, by co-operation between the key
l6 and the abutment 2| into the position shown
in Fig. 2.
In the closed position of the door (Fig. l), the
tooth 39 of the catch 31 is located in the neigh
bourhood of the notch 35, and the arm 38' is
close to the pin II’. By giving the key IS a
quarter of a turn to the right, the catch 31 will be 10
turned so that the tooth 39 leaves the notch 35
and so that the arm 38' strikes against the pin
l i’. At the same time the catch 31 will be locked
in this position by the key l6 so as to prevent the
door from being opened from. the outside.
On an attempt to open the door with a false
key, one of the tumblers is likely to be turned too
far, so that the lever 55, 56 will take up the po
sition shown by dotted lines in Fig. 5. The signal
ling circuit will then be closed, and the signal ,
will be operated until the lever 55, 56 is restored
to normal position by the insertion of the rod 68.
An attempt to open the lock by force, for in
stance by the. insertion of a tool intended to force
the bolt ill into the lock casing, the projection 22
will almost immediately enter into engagement
with the spring 26’ which, on continued inward
movement or" the bolt, imparts to the respective
tumbler a movement which will eventually cause
the closing of the signalling circuit through the ‘
lever 55, 56, and the signal will then remain in
operation as previously described.
The invention is not restricted to the actual
lock construction illustrated in the drawings but
may be modi?ed within the limits imposed by the
appended claim. For instance, the blade spring
25’ can be replaced by a rigid rod or the like con
nected to the head of the respective tumbler and
adapted to engage with its free. end in the recess
I claim:
A door lock of the character described com
prising a lock casing, a lock bolt in said casing,
a projection on said lock bolt, key operated tum
blers mounted. pivotally in the casing on an axis
at right angles to but out of alignment with the
path of said projection and located in a vertical
plane horizontally distanced from that of the
projection, each tumbler having an arm whereby
it is normally supported on the bolt, said arm 50.
being in substantial alignment with the path of
the projection and operative, except when the
tumbler is operated by the proper key, to engage
said projection for preventing the bolt from being
retracted, the arm of one of the tumblers being 55
flexible and longer than the others and operative
to pivot its tumbler under inward pressure there
on by the bolt, and a circuit closing element so
arranged in relation to the tumblers as to be op
erated thereby for closing an electric circuit when 60
the tumbler having the ?exible arm is moved by
said arm or when the same and the other tumblers
are moved through more than the normal angle.
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