Note: Descriptions are shown in the official language in which they were submitted.
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The invention relates to a steering lock with lock
cylinder for motor vehicles.
One such steering lock is known from German Publ.
Spec. No. 20 59 215. This known steering lock comprises as
blocking part an element of disc form which reaches its posi~
- tion blocking bolt in that it rotates about an axial extension , -
of the cylinder core and is held fast in this position by a
blocking lever controlled by the key. After withdrawal of the
key the blocking part is turned back by a torsion spring which
is arranged coaxially about the cylinder core extension and -
presses the blocking part towards the cylinder core. So that
the end of the key-controlled lever may arrest behind one face
of this blocking part in order to hold it fast in the blocking
position, the blocking part slides with an oblique face along ~ -
the lever end and in this movement is displaced or tilted i
axially in the direction of the locking bolt against the pres-
sure of the spring so that the blocking part not only rotates -~
in a plane situated transversely of the longitudinal axis of ~ -
~ the lock cylinder but additionally tips in the axial direction,
so that additional space is necessary in the axial direction. ~-
Furthermore a spring is necessary which must exert a pressure
not only in a direction of rotation but also in the axial
direction. The fitting of such a~blocking part, including the
spring, on the cylinder core extension is difficult and time-
consuming. ~ ;
It is an object of the invention to produce a steer- -~
ing lock of small construction in the radial and axial direc-
tions which comprises few individual parts, is easy to fit and -
possesses low weight.
According to the present invention, there is provided
a steering lock with lock cylinder for motor vehicles having a
locking bolt spring-loaded in the direction towards the locking
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position and arresting the steering column, which bolt is
displaceable into the ùnlocked position by a dog arranged on a
prolongation of the cylinder core and, after the dog has been
moved back, continues to be held in the unlocked position by
a blocking part which is arranged between cylinder core and
locking bolt and is held in its blocking position by a blocking
member which, during the movement of the locking bolt into the
unlocked position, runs along a face of the blocking part,
while the blocking part yields and snaps into engagement on the
blocking member, and the blocking member, after withdrawal of
the key, is movable into a position in which it liberates the
blocking part, characterized in that the blocking part is a I -
slider which is movable parallel to the longitudinal axis of
the locking bolt and is pivotable, for engagement with the
blocking member, in a plane perpendicular to the axis of the
lock cylinder.
- The blocking part in accordance with the invention
moves only in a plane situated transverse to the cylinder core
extension, so that space can be saved between the locking bolt
and the cylinder core and thus the lock is of small construc-
tion. In the radial direction too the blocking part requires
only little free space with a long locking bolt guide. The
blocking part needs no spring for its movements, but makes use
of the spring force of the spring which loads the locking bolt.
The fitting of this steering lock is especially simple, since
the parts, for fitting, need only ot be laid or set into the
steering lock body, without expensive pre-assembly. The small ~ -
dimensions make themselves noticeable also with regard to lower
weight.
Due to this solution, with equally high security,
additional springs, pawls and the like parts are saved and
essential functions are transferred to parts which are in any
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~151889
case integral components of a steering lock. While sliders
are known ~ se in steering locks, in these additional movable
parts are always necessary as arresting means, so that a high
number of parts is reached and these locks are expensive to fit
and possess relatively large dimensions in the radial and axial
directions. i~-
Advantageous developments of the invention will be
described hereinafter.
Examples of embodiment of the invention are illus-
trated in the drawings and will be described in greater detail
below. -
FIGURE 1 shows a longitudinal section through a
steering iock in the locking readiness position;
FIGURE 2 shows a cross-section through the steering
lock along the line I - I in Figure l;
FIGURE 3 shows a cross-section through the steering
~ lock according to Figure 2, in the locking position; Figure 3 - - -
is located on the sheet containing Figures 5, 6 and 7.
FIGURE 4 shows a longitudinal section through the ;
steering lock along the line II - II in Figure 2;
FIGURE 5 shows a perspective representation of the
biocking part: -
FIGURES 6 and 7 show alternative embodiments of the
blocking part. ;
The steering lock comprises a steering lock body 1 ~-
the external dimensions of which correspond to the steering
reception opening in the motor vehicle, so that it can be -~
pushed into this opening. On the side accessible to the driver ~;~
lock cylinder 2 is arranged, secured by shape-locking engage-
ment in the steering lock body, and comprises in the region of ,;;
the key entry a cap 4 and bush 3 capable of resistance to ~
cutting. The lock cylinder 2 comprises a cylinder housing 5 ~ ~-
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and an axial.ly non-displaceably mounted cylinde~r core 6
rotatable therein, in which there are arranged the spring- ¦ :
loaded tumbler pins 8 influenced by the key 7 and acting in
the direction of rotation of the cylinder core, which pins
cooperate with blocking edges which are formed by radial
widenings 8, 10, extending parallel with the cylinder axis, of
the cylinder housing which adjoins the cylinder core
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on all sides. Approximately axially parallel in the cylinder
housing 5 a double-armed lever is arranged as blocking member
11 which can be pivoted in a plane extending through the axis
of the cylinder core about a spindle 12 which is fast in the
cylinder housing and extends outside the cylinder core at right
angles to the cylinder core axis. The upper arm 13 of the
lever 11, which reaches to the end face of the lock cylinder,
lies in the path of displacement of a control dog (slider) 14
mounted radially movably in the region of the key entry in the
cylinder core 6, which dog in one position reaches with one .:
end into the key passage 15 and is aligned by the other end with
the peripheral surface of the cylinder core. The lower arm 16
of the lever 11 on the locking bolt side extends with a protuber-
ance 17 of nose form directed towards the middle of the cylinder ~ ;
into the edge region of a blocking part 18 of frame form ar-
ranged at right angles to the cylinder axis, which part 18
is mounted for displacement parallel to the locking bolt 19 -
between the lQck cylinder core 6 and the locking bolt in the ~ ;
steering lock body 1. The blocking part 18 acting as slider ~
has a longitudinal opening 33 axially parallel with the locking ~ -
bolt, through which there is pushed a coaxial shank 32 of a
coaxial prolongation 29 of the cylinder core 6.
In a marginal zone 20 the blocking part 18 has a recess
18c of locking tooth form in which there lies the protuberance
17 of the lever arm 16, when the locking bolt is driven out.
When the blocking part 18 is displaced, the protuberance 17
comes on to a ramp face of a locking tooth 21 of the blocking
part 18. The blocking part 18 then deviates transversely of
the longitudinal direction of the locking bolt and snaps with
the end face 21a behind the protuberance 17. On the side remote
from the steering system the blocking part 18 is provided with
a protuberance 22 rising to the lock cylinder side and protruding
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at right angles from the control part, which protuberance
comes to abut on a parallel protuberance 23 of the locking
bolt 19, which is displaceably mounted in the steering lock
body. The locking bolt is loaded in the steering direction by
a spring 24 which bears on an angled-off closure piece 26
covering the fitting opening 25 of the locking bolt 19, which
closure piece, with a part 27 extending to the locking bolt
longitudinal axis, extends over the centre of the lock so far
that an opening 28 arranged therein can be penetrated by parts
extending in the axial direction of the lock, especially the :
shank 32 of the prolongation of the cylinder core 6, which
effectively prevent unauthorised removal of the closure piece 26. .
On the prolongation 29 there is formed a dog in the ~ :
form of a radial widening 30 of segment form between control
part 18 and cylinder core 6, which comes to abut for displacement
with an axial, cylindrical, eccentric face on the protuberance
22 of the blocking part and thus also displaces the locking
bolt 19, since its protuberance 23 abuts on the protuberance 22. -
In the further axial extension the prolongation 29 penetrates : . .
with its shank 32 through not only the opening 33 of the blocking ~ -
part 18, but also a longitudinal opening 34 of the locking bolt
-- 19 and the opening 28 of the closure piece 26. With an end .
zone 35 of corresponding formation the shank 32 engages in shape-
locking manner in the rotatable part of the steering lock switch
36. -~:
The blocking part 18 is additionally pivotable in a
plane extending transversely of the lock cylinder axis about :
a pivot point P which is formed by the surface of the control cam : .
of the dog 30, the blocking part 18 abutting with an edge of a
protuberance 22 on this surface. This edge and thus the pivot
point P too lie on the side of a plane through the lock cylinder ~:
axis and through the locking bolt axis on which the end of the
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lever 11 also lies. Since the protuberance 23 abuts on the end
face 18c of the blocking part 18 at a point K which lies more
remote than the pivot point P from the blocking member 11 or
the protuberance 17 of the blocking member, transversely of the
locking bolt longitudinal axis (and in the plane of the blocking
part of plate form), a pivoting of the blocking part 18 takes
. .
place during its shifting away from the steering column against
a force Kl which is directed approximately transversely of the ~ ;
locking bolt axis in the plane of the blocking part 18 of plate
form to the protuberance 17, and is generated by the action of
the helical compression spring 24 loading the locking bolt in the -
direciton of the steering column. This spring presses the ;~
protuberance 23 against the end face 18c of the blocking part ~ --
and generates a moment about the pivot point P which produces
the resilient force Kl. The end face 18c forms an obtuse angle
of about 170 the apex S of which, during the pivoting of the
blocking part, forms the abutment point for the protuberance 23.
In the steering lock body a protruding turned part
37 is mounted which is pressed outwards by a spring 38 which
- 20 bears on an annular face 39 of the steering lock body. The
protruding turned part 37 protrudes with a part 40 of its axial
extend beyond the external circumferential surface of the
steering lock body 1, in order to be able to snap into a recess
of the lock socket. With the opposite side 41 it lies in the
zone of pivoting of the radial dogs 30 of the prolongation piece
29.
The blocking part 18a as represented in Figure 6
carries on the end remote from the steering column a metallic
leaf spring 43 which lies in between the protuberance 22 and the -
protuberance 23 and seeks to press the blocking part 18 away
from the locking bolt protuberance 23 towards the steering column.
The leaf spring can also be replaced by a resilient synthetic
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~151889
plastics arm 45 formed on the blocking part 18b. When the
locking bolt is not yet engaged in the steering column and when
the lever 11 is disengaged from the blocking part 18 (by reason
of withdrawal of the key), the blocking part is pressed by these
springs 43, 45 into a position in which it is not manipulable
by tools introduced without authorisation. -
Starting from the position of the lock parts in the
locking position as illustrated in Figure 3, where the key 7
is introduced into the key passage 15 of the cylinder core 6
for the liberating arrangement of the tumbler pins 8 and is
turned, according to the path of rotation of the steering lock,
into the drive position, the following takes place: The slider
14 comes to abut with one end on the key shank and with the
other end on the lever arm 13 of the lever 11. The lever 11
is here pivoted about the spindle 12 and engages with the
protuberance 17 of the lever arm 16 in the recess 18c of the
blocking part 18. In the subsequent rotation by means of the
key 7 the eccentric face of the dog 30 on the prolongation piece
29 acts upon the protuberance 22 of the blocking part 18 and
displaces the latter, and thus the blocking part 18 displaces
the protuberance 23 and the locking bolt 19 against the action
of the spring 24 into the unblocked position. The control part
18 comes with the ramp face 21b of the detent 21 to abut on the
protuberance 17, whereby the control part 18 is forced, against -
- the force of the locking bolt spring 24, into a position deviating
from its central longitudinal axis, until the protuberance 17
comes to abut behind the detent 21 on the face 21a and thus
arrests the blocking member and the locking bolt in the unblocked
position, irrespective of further lock actuation by the key.
In this rotation of the lock parts, which is possible only by
means of the key, the radial dog 30 with its edge limitation
clears the displacement path of the protruding turned part 37.
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The protruding turned part 37, which effects the arresting ofthe steering lock in the socket on the vehicle, can thus be
displaced appropriately in the direction of the lock axis if
dismantling of the steering lock is necessary.
To reach the locking position the key is rotated
in the opposite direction into the stop position. In the --
resultant locking readiness position according to Figure 2, -
the blocking part 18 comes to abut with the face 21a of the
detent 21 on the protuberance 17 of the blocking lever 11. The -~ -
locking bolt is thus held in the unlocked position. On the
subsequent complete withdrawal of the key the supporting of
the blocking member (blocking lever) 11 by the slider 14 -
ceases. Due to the action of the locking bolt spring 24 upon
the blocking part 18 the blocking lever 11 is pivoted by the
detent 21 about its pivot point 12 and clears the path for
displacement of the control part 18 into the blocking position.
The plane in which the blocking lever 11 is pivoted extends at
an angle ~ of about 45 to the longitudinal axis of the control
part 18 and of the locking bolt 19. Thus the face 21a of the
detent 21 and the face of the protuberance 17 coming to abut
on it can extend parallel to one another and at an angle of 90
to the longitudinal axis of the locking bolt. This advantageously
results, in the locking readiness position, in a functionally
reliable detention of the blocking part 18 on the blocking lever ;~
11 and abutment of the blocking part 18 on the protuberance 23
of the locking bolt, which precludes a liberating pivoting of '
the control part 18. -
The control parts 42 and 44 as illustrated in Figures
6 and 7 achieve the object that the blocking part, after with- -
drawal of the key, is shifted by the springs 43, 45, even without
the action of the locking bolt spring 24, into a position in
which they cannot be manipulated by the blocking lever. Thus ,
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with low expense an additional security is advantageously achieved,
if the locking bolt, after withdrawal of the key, is not engaged
in the locking slot of the locking sleeve on the steering spindle,
and rests on the circumferential surface thereof. -
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