HRP20020818A2 - Cylinder lock with a cylinder housing and flange key for a cylinder lock - Google Patents

Abstract

A cylinder lock with a cylinder casing 1 and a rotatable cylinder core 2 comprises: a key channel 4 for receiving a flat key 5; followers [25, figure 1] for control faces on the key; locking parts which allow or prevent rotation of the cylinder core 2; and a slidable catch bar 26 located within the cylinder core 2 in a plane across the longitudinal centre plane [7, figure 1] of the cylinder lock. The catch bar 26 comprises a locking arm 27 positioned over the key channel and is movable by the edge of the key 5 and by the spring force 35 between locked and unlocked positions. When the key is only partially inserted in the key channel, a locking flank 30 on the key holds the locking arm in a locking recess 28 in the cylinder casing, thus preventing rotation of the core 2. When the key is fully inserted, as shown in figure 2, the locking arm is positioned opposite a free recess 29 on the key. Upon rotation of the key the locking arm 27 can enter the key recess 29. When the key is rotated, the recess 29 retains the key such that the key cannot be removed [figure 3].

Description

The invention relates to a cylinder lock with a cylinder housing and a cylinder core that can be rotated therein, which has a key channel for a flat key and contact elements for the control surfaces of the key as well as locking elements, which prevent or enable rotation of the cylinder core.

When the key is inserted into the cylinder lock, it must only be able to be extracted in the so-called zero position. The key should be prevented from being pulled out in any other rotated position, especially the 180° cylinder core position. The existing construction measures do not work in all cases.

However, when the cylinder core is in the zero position, the key must also be able to be pulled out, even when the key is pulled by a turning force. This happens when, for example, the door is closed with the key turned and when the key is tried to be extracted while holding the correct extraction position. With locks, it can happen that the locking elements located inside the lock get caught with the tensile force when turning, or only when the key is briefly dropped and then pulled out. This is often seen by users as a flaw in the lock's construction.

The proposed invention should solve the problem so that the key can only be pulled out in a precisely defined zero position, and in the rotated position the locking elements, which are in the lock, must be relieved from pulling, even if the key is subjected to a tensile load.

According to the proposed invention, this task is solved by placing a movable stop stirrup in the cylinder core in a plane transverse to the central longitudinal plane of the cylinder lock, which holds the key channel at a short distance with the stop arm, whereby the stop arm is controlled by the control surface of the key and spring forces can move between the locking position and the release position, and when the flat key is fully inserted the key release recess is on the opposite side, and when the key is not fully inserted it is held with the locking side of the key in the locking position in the stop recess of the cylinder housing .

The flat key for the cylinder lock described above is characterized by the fact that the key has a recess on the back of the free position and then at the end, in the direction towards the top of the key, it has an oblique locking side.

Further advantageous features are listed in the patent claims, in the description and in the attached drawings.

In the following, the invention is explained in more detail by means of practical examples. The features according to the invention are visible on every lock construction, so no limitations are given in this regard. The advantage of tension relief of locking elements in the lock applies to all lock constructions of this type.

Figure 1 shows a cross-section through a cylindrical lock of a certain type of construction, which is given only as an example;

figure 2 shows a schematic longitudinal section through part of the cylinder core with the key inserted in the zero position;

figure 3 shows the rotated position of the cylinder core;

figure 4 shows a section along line IV-IV from figure 2;

Fig. 5 shows a top view of the cylinder core with the cylinder casing cut away; non-essential parts of the lock are omitted here;

figure 6 shows one version viewed from above; Figure 7 shows a version of the back of the key viewed from above.

According to Figure 1, the cylinder core is rotatably mounted in the cylinder housing 1. The rotation takes place along the cylindrical plane of rotation 3. In the key channel 4 there is a key in the form of a flat key, the key blade 6 of which has known key notches. In the central longitudinal plane 7 of the lock, there is both the channel 4 of the key with the key 5 and also the hole 8 of the insert core. In the insert core bore 8 there is a core insert 9, which is guided into its position by means of a notch on the tongue 6 of the key.

On the side of the guide channel 19 in the recess 16 there is a movable stop element 17 which is tensioned by means of a spring 18 in the direction of the stop recess 19 of the cylinder housing. When the position of the cylinder core is unrotated, as shown in Figure 1, the stop lug 20 of the stop element 17 is stopped in the stop recess 19.

The locking element 17 has a contact extension 21 at its inner end, opposite each guide body 11, which is dimensioned so that it can be pushed into the release slot 13.

The way the cylinder lock works is as follows:

When the key 5 is pushed into the lock, the core insert 9 is pressed by the key spring 6, against the pressure of the spring, into the corresponding downward position. The guide body 11 is moved, whereby with the right key the release slot 3 comes into the corresponding position, so that the stop lug 20 is located opposite it. In this way, by turning the cylinder core, the stop element with its stop carrier can be pushed out of the stop recess 19, whereby the contact element 21 is pushed into the release slot. Thus, the cylinder core can turn freely.

With the multiple arrangement of core inserts 9 and guide bodies 11, all of these positions must be occupied, so that the locking element 17 can reach the release position.

When using the wrong key, the core insert 9 and the guide body 11 connected to it takes a different position, so that the contact elements 21 are formed on the side 21 of the guide body, which blocks the lock.

In the plane of rotation of the guide body 11, the cylinder housing 1 has in each case one annular groove 22, which is open towards the cylinder core. The width of the annular groove 22 corresponds to the width of the guide body or is greater. By means of the annular groove 22, the respective ends of the guide body 11 and the core inserts 9 are released, which increases the stroke on the one hand, and on the other hand, both extension elements can be made longer, so that the guidance in the guide channel and in the hole 8 for the insert in the nuclei. In addition, when the key is pushed in, the upper end of the guide body 11 stops in the annular groove 22, thus providing protection against pulling out the core. The cylinder core cannot therefore be broken by known pulling procedures. For the lock features listed so far, the key 5 can fit any suitable conventional lock, as is common for split retaining inserts. In the proposed embodiment, it has longitudinal profile grooves 23 and side profile recesses 24, which can be added in a known manner with additional contact elements 25 and offer additional possibilities for changes.

The cylinder housing in figure l has the usual housing shape with segment 32. However, as can be seen, there are no lock elements in this segment. Therefore, this segment can be discarded or this space can also be used for additional lock elements and fastening elements. The arrangement of annular slots 22 is drawn as an example only and may also be omitted.

Figure 2 shows a part of the cross-section along the central longitudinal plane 7 through a section of the inner (joint side) end of the cylinder core and the cylinder housing. The key 5 is fully inserted so that all core inserts (not shown here) belonging to the individual notches 36 of the key are positioned so that the cylinder core 2 can rotate against the cylinder housing. In the plane that runs transversely above the central longitudinal plane of the cylinder lock, there is a movable stop stirrup 26, which engages with the stop arm 27 over the channel 4 of the key on its narrow side.

As can be seen in particular in Figure 3, the upper end of the stop stirrup 26 with its stop arm 27 is located in the stop recess 28 of the housing 1 of the cylinder. The key 5 has a free position recess 29 opposite the stop arm 27. Because of this recess 29 of the free position, the cylinder core can rotate freely, because when the stop arm 27 is turned, it is pushed out of the stop recess 28 and released downwards in the recess 29 for release. However, this possibility of moving the stop stirrup only exists when the key is pushed all the way in. If the key is not pushed all the way in, the stop side 30 of the key is located under the stop arm 27, so that the stop arm cannot be pushed down and thus the cylinder core cannot be turned either.

Dimensional details are approximately such that the total depth of the free position recess 29 (Y) is equal to the total height of the stop arm 27. The depth X of the stop recess 28 corresponds approximately to the depth of the free position recess 29 opposite the stop side 30 towards the tip of the key inward.

As seen in Figure 2, the position of the locking side 30 forms a depression towards the back 31 of the key. This reduction allows the tip of the key to be pushed under the stop arm 27. The reduction also represents a further safety feature of the key, as conventional flat keys without such reductions cannot be fully inserted into the key channel. The operation of the device is conditioned by the fact that the locking side 30, shortly before the key is fully inserted into the lock channel, engages the stop arm 27 and prevents the cylinder core from rotating prematurely. This also eliminates the lateral load on the core insert, which is thus relieved from each rotation, because rotation is only possible when the key is fully inserted.

In the pivoted position as shown in Figure 3 with the key fully inserted, the stop arm 27 firmly holds the key in its position, so that it cannot be pulled out.

As can be seen in Figure 4, the stop stirrup 26 consists of a leading arm 33, which is located in the receiving hole 34 under the pressure of a spring 35.

The outer surface 39 of the stop arm 27, which abuts the stop recesses 28, is made so wide that the stop arm 27 cannot engage in any other stop recesses 19, to avoid braking when the cylinder core rotates.

As can further be seen in Figure 2, the position of the stop stirrup 26 is primarily in front of the first notch 36 of the key, viewed from the top of the key.

However, the distance Z is in principle variable, so that the gripping stirrup can also be located away from the tip of the key.

The distance Z from the top of the key can be varied, thereby increasing the number of versions, which means a further advantage of the invention.

In figures 2 to 5 in the lock, the stop stirrup 27 and the recess of the free position 29 on the back of the key 38 are made transversely, so that they stand perpendicular to the central longitudinal axis 7. However, the arrangement can also advantageously be inclined, as shown in the figures 6 and 7.

Fig. 5 shows the arrangement of the stop stirrup 26 as viewed from above on the cylinder core. Core insert holes 8 are drawn schematically, with no core inserts in them. With the gap 37 in the cylinder core, the necessary space is provided for the movement of the stop arm 27, as can also be seen in Figure 4.

The stop stirrup arrangement and key construction are largely independent of the rest of the lock construction.

According to Figure 6, the cylindrical lock can be changed so that the stop arm 27 of the stop stirrup 26 is located obliquely to the central longitudinal plane 7 of the lock. For this reason, here also the pitch 37 of the cylinder core is set diagonally. The angle towards the vertical is drawn slightly higher and in practice it is approximately 30°. In accordance with this, on the back of the key 38 according to Figure 7, the depression of the free position 29 is also placed obliquely, which serves to increase the number of versions and the security of subsequent blocking.

Alternatively, the lock may also combine the vertical arrangement of the stop arm 27 of Fig. 2 with the inclined arrangement of the release recess 29 on the back of the key, wherein the stop arm 27 has an inclined rib which contacts the inclined release recess.

Claims (11)

1. A cylindrical lock with a cylinder housing and a cylinder core, which can be rotated therein, having a key channel for a flat key and contact elements for the control surfaces of the key as well as locking elements, which prevent or enable rotation of the cylinder core, characterized in that in the core (2) of the cylinder, in the plane transverse to the central longitudinal plane (7) of the cylinder lock, a movable stop stirrup (26) is placed, which engages with the stop arm (27) on the narrow side over the channel (4) for the key, whereby the stop arm by means of the control surfaces of the key (5) and the spring force (35) can move between the locking position and the release position, and when the flat key is fully pushed in, it is located opposite the recess (29) of the free position of the key, and when the key is not pushed until the end, it is held in the locking position in the stop recess (28) of the cylinder housing by means of the locking side (30) of the key. 2. Cylindrical lock according to claim 1, characterized in that the stop stirrup (26) has one movable guide arm (33) located in the receiving bore (34) of the cylinder core and a stop arm (27) laterally moved from it. 3. Cylindrical lock according to any of claims 1 and 2, characterized in that the stop stirrup (26) is located in a plane whose distance (Z) from the inner end of the cylindrical lock is variable, and this plane is primarily in front of the first core insert. 4. Cylindrical lock according to any of claims 1 to 3, characterized in that the cylinder core (2) has a notch (37) for guiding and moving the stop stirrup (26). 5. Cylindrical lock according to any of claims 1 to 4, characterized in that the stop arm (27) is located at an angle to the perpendicular to the central longitudinal plane (7) (Figure 7). 6. Cylindrical lock according to claim 5, characterized in that this angle is approximately 30°. 7. Cylindrical lock according to any of claims 1 to 4, characterized in that the stop arm (27) stands vertically on the central longitudinal plane and also has oblique ribs, which engage in the oblique depressions (29) of the free position of the key. 8. A flat key for a cylinder lock according to any one of claims 1 to 7, wherein the key has change elements such as key notches and/or longitudinal profile grooves and side profile recesses, characterized in that the key on the back (38) has a recess ( 29) in a free position and the indicating locking side (30) is attached to it in the direction towards the top of the key. 9. A flat key according to claim 8, characterized in that the depth (Y) of the recess (29) of the free position viewed from the back of the key corresponds to the height of the stop arm (27), and the height (X) of the recess (29) of the free position viewed from the locking side ( 30) is smaller. 10. A flat key according to claim 8 or 9, characterized in that the position of the recess (29) of the free position, viewed from the top of the key downwards, is variable, preferably in front of the first notch (36) of the key. 11. A flat key according to any of claims 8 to 10, characterized in that the depression (29) of the free position on the back (38) of the key is placed obliquely (Figure 7).