EP0712980A1 - Cylinder lock with cylinder core and cylinder casing - Google Patents

Abstract

In the cylinder core (2) a stop stirrup (45) bridging over the key channel (4) is arranged, and is movable in a recess of the cylinder core in the direction of the cylinder housing. The stop stirrup is completely fitted within the cylinder core and the rotary plane (8) of the cylinder housing is formed as a cylinder surface in the engagement area of the stop stirrup. In the cylinder housing opposite to the stop stirrup a securing recess is arranged in the zero position of the cylinder core. In the cylinder housing a ring groove has a specific depth (x) and the securing recess has a greater depth.

Description

The invention relates to a cylinder lock with a cylinder core and cylinder housing, the cylinder core having a key channel which is open on one side to the plane of rotation between the cylinder core and the cylinder housing. Furthermore, the invention relates to a flat key for a cylinder lock, which preferably has profile ribs and profile grooves on the flat sides and locking notches on the key face.

In the case of cylinder locks and the associated flat keys, the problem arises, in particular in the design of larger locking systems, that even a key that is not fully inserted can allow the cylinder core to be rotated, causing incorrect locking and, depending on the lock construction, also a malfunction of the lock as a whole can come. How it can come to the incorrect closure is explained below with reference to FIG. 1.

The present invention has for its object to ensure that a rotation of the key with the cylinder core is only possible when the key is fully inserted up to the key stop. The construction should be insensitive to faults and as cheap as possible.

Another key task for the key manufacturer is to increase the variation options within a system for the development of locking systems. It is advantageous to reuse previously used combinations of longitudinal profiles and locking notches and to distinguish these keys from each other by additional features. Furthermore, the use of improperly imitated keys and their manufacture should be made more difficult. In addition, the new cylinder lock and the flat key that works with it should meet the high demands placed on stability and functional reliability are enough.

The cylinder lock according to the invention is characterized in that a locking bracket bridging the key channel is arranged in the cylinder core and is displaceable in a recess in the cylinder core in the direction of the cylinder housing.

The flat key for the cylinder lock, which is preferably intended for use with the aforementioned cylinder lock, is characterized in that it has at least one locking extension and at least one locking recess on the key back and that the key back between the key tip and the locking recess is lowered.

Further advantageous features of the invention can be found in the following description and the drawings as well as in the patent claims.

The invention is described in more detail below, for example, with reference to the drawings.

Fig. 1 is a central longitudinal section through a lock cylinder according to the prior art. Fig. 2 shows partially in longitudinal section one half of the housing of a double cylinder lock and Fig. 3 shows the view of the end face of the cylinder housing. Fig. 4 is a schematic representation of the side view of an embodiment of the key according to the invention and two associated cuts. Fig. 5 shows the side view of a key in a preferred embodiment and a broken central longitudinal section through the associated lock. Fig. 6 shows the top view of a cylinder core and two associated cuts. 7 to 10 show different sectional views through the cylinder lock with different functional positions. Fig. 11 and 12 show a detail of the lock in associated cracks.

One of the problems that is solved with the present invention will be explained with reference to FIG. 1.

The cylinder core 2 is rotatably supported in the cylinder housing 1. The key 3 can be inserted into the key channel 4. In the illustrated embodiment, the lock comprises tumbler pins 5 which are divided several times and which are brought into such a position by the locking notches 6 of the correct key that the divisions 7 of the tumbler pins 5 come to lie in the plane of rotation 8 between the cylinder core and the cylinder housing, thereby rotating the cylinder core is possible.

As can be seen from FIG. 1, the key 3 is not fully inserted, but only to the extent that the first four tumbler pins of locking notches are pressed down against the force of the springs 9. The last, innermost tumbler pin is pressed down by the flank 10 of the key tip, so that this tumbler pin, too, comes to rest with one of its divisions 7 in the rotary plane 8. In the arrangement shown, it follows that all tumbler pins each have a division in the plane of rotation 8, so that the lock is released and the cylinder core can be turned, although the key is not fully inserted. This condition can arise especially with larger and more complicated locking systems, since in such systems each tumbler pin is divided several times and several divisions are available per tumbler pin, as can be seen from the drawing. A malfunction can occur if the key tip also has a control function and, for example, effects the clutch with clutch elements not shown here, via which affects the rotation of the cylinder core on the subsequent key mechanism. If this coupling is missing, since the key is not fully inserted, the cylinder core can be rotated without the coupling elements also being rotated. The lock can become unusable.

The maximum insertion depth of the key 3 is limited by the key stop 11, which can strike the collar 12 of the locking cylinder.

Fig. 2 shows the view of a partially broken part of the housing of a double cylinder lock. The bore 21 serves to receive the cylinder core and the upper and lower limits of the rotary plane 8 are shown. In the cylinder housing, a longitudinal groove 22 is provided at the top, which allows the locking extension 19 described below to be inserted with the key until it comes to rest in the annular groove 23. It is therefore a prerequisite for turning the key with the cylinder core that the locking extension 19 lies in this annular groove and can be turned. This ensures that the key must be pushed in completely in order to prevent an incorrect locking according to FIG. 1. The key cannot be turned in another position.

Furthermore, the locking extension 19 in the rotated position also provides increased security against being pulled off. 2 also shows two bores 24 for receiving the tumbler pins. The longitudinal groove 22 is cleared in the simplest way over the entire length of the cylinder housing. However, it is sufficient to guide the longitudinal groove 22 only from the end face 25 of the cylinder housing to the annular groove 23.

Starting from the bore 21 is one in the cylinder housing arcuate locking recess 41 is arranged, which serves the engagement of a locking bracket described later.

Fig. 4 shows a key according to the invention with the key chalk 42 and the key shaft 13, the two flat sides 14, 15 of which can be profiled by longitudinal profile ribs and profile grooves. Five locking notches 6 are arranged on the key chest 16, the positions of the assigned pin tumblers of the cylinder lock being indicated by the lines 17.

According to the present invention, the key back 18 has a locking extension 19 and a locking recess 20. The locking extension 19 extends beyond the key back 18 and the locking recess 20 extends from the key back 18 in the direction of the key flat sides 14 and 15.

As can also be seen in FIG. 1, the key back 18 lies in the plane of rotation 8 of the cylinder core when the state is pushed in. The locking extension 19 thus projects beyond the rotary plane 8 into the cylinder housing. The locking extension is arranged along the longitudinal extent of the key shaft 13 in such a way that it bridges a longitudinal region of the key back which lies between two adjacent notches 6.

4 b and c show that the locking extension 19 tapers from the key back 18 upwards, in particular conically. 4 that the locking extension 18 on the key back is closer to the key lock than the locking recess 20. The locking extension is, as shown, preferably between the first and second closing notch 6.

The key spine is slightly lowered in section 43 compared to the other course of the key spine 18 and this lowered part extends from the locking recess 20 to the key tip. In this embodiment of the key, the lowering is less than the depth of the locking recess 20.

Fig. 5 shows another preferred embodiment of the key according to the invention with the associated lock construction. The difference to the embodiment according to FIG. 4 lies in the fact that the lowered section 43 of the key back runs through at the same height until it rises to the height of the key back 18 via the step 44. A locking bracket 45 bridging the key channel is provided in the cylinder core 2. By lowering section 43 of the spine of the key by the amount y it is achieved that the key with this lowered section can be pushed under the locking bracket 45, whereby it is at most on the plane of rotation 8 between the cylinder core and the cylinder housing, but no clamping effect between the cylinder housing and the cylinder core causes. A key that does not have the lowered section 43 or whose length is insufficient would not be able to be inserted entirely. The key would get caught on the locking bracket 45 with the upper oblique flank 46 of the key tip. The area corresponding to the locking recess is designated 20.

Furthermore, it can be seen from FIG. 5 how the locking extension 19 lies in the annular groove 23 and can be rotated in the latter with the cylinder core 2.

Of the five pin tumblers, only one pair of tumbler pins 5 is shown for the sake of simplicity of illustration, only the bores of the others are shown.

In a modification of the key according to the invention, the lowered portion 50 of the key back can run at a flat angle to the remaining portion of the key back 18, the lowered portion 50 falling towards the key tip. This measure makes it easier to insert the key. An angle between 1 ° and 2 ° is preferred.

Fig. 6 shows a plan view of the cylinder core 2 with the sections along the lines b-b and c-c.

The key channel 4 is open up to the rotary plane 8. The bores 26 for receiving the pin tumblers are only indicated by dashed lines. In the zero position of the cylinder core, these bores 26 are aligned with the bores 24 of the cylinder housing (FIG. 2).

Between the first and second bores 26, 4 recesses 27 are arranged on the side of the key channel for receiving catch pins 29. The recesses 27 project through the cylinder core and are asymmetrical in cross-section, so that twisting of the catch pins is prevented, which are easily displaceable within the recesses 27.

Furthermore, a recess 28 extends on both sides of the key channel 4, in which the locking bracket 45 can be arranged displaceably. FIG. 6 c shows a section through this cross-sectional area and FIG. 8 shows the same cross section with the locking bracket inserted.

If the correct key according to FIG. 5 is inserted into the cylinder core, the locking extension 19 comes to lie between the two catch pins located in the recesses 27.

The mode of operation is described with reference to the following FIGS. 7 to 10. 7 and 8 show cross sections through the lock according to the invention analogous to lines b-b and c-c in FIG. 6, the key according to FIG. 5 being inserted.

The cylinder core 2 is in the zero position, that is, in the position in which the key 3 can be pushed in and out. The plane of rotation 8 is formed by the cylindrical outer surface of the cylinder core 2 and the inner surface of the cylinder housing 1. The spine of the key 18 lies over most of its length in the plane of rotation 8. However, the locking extension 19 projects over the parting plane 8 into the annular groove 23, so that turning the key and the cylinder core is only possible in this fully inserted position.

The catch pins 29 are slidably seated in the recesses 27. They are preferably made of hard metal or ceramic and are at a distance from one another which is smaller than the diameter of the tumbler pins 5. The catch pins thus also serve as protection against drilling and against the so-called corkscrew method.

The catch pins 29 are pulled into the position below by gravity and project into the annular groove 23 at the bottom. When the cylinder core is rotated about the zero position, the run-up surfaces 30, 31 cause the catch pin in question to be raised above the division 7 lying in the plane of rotation 8 between the housing pin 32 and the core pin 33 lying above it.

In the area of the sectional view in FIG. 8, the locking bracket 45 is slidably mounted in the cylinder core 2 within the recess 28. When the key is pushed in according to the embodiment variant FIG. 5, the lowered section comes 43 of the back of the key to lie below the locking bracket 45 and can be inserted entirely.

For the key design according to FIG. 4, the latching recess 41 is provided in the cylinder housing, which gives the locking bracket 45 upward freedom of movement when the cylinder core is in the 0 position. Thus, the key according to FIG. 4 with its section 43 which has been lowered to a lower extent can be inserted until the locking bracket engages in the locking recess 20, whereby the position according to FIG. 8 is also reached. The lock variant shown in FIG. 8 with the locking recess 41 can also be locked by the key according to FIG. 5. If the locking recess 41 is not provided in another lock variant, the key according to FIG. 4 cannot be inserted.

When the cylinder core is rotated (FIG. 7), after a rotation of 180 °, the locking extension 19 reaches the spring-loaded housing pin 32 and presses it downwards so that the catch pins 29 slide over the housing pin 32 with the aid of the run-up surfaces 30, 31, so that the cylinder core can be rotated 360 °.

In FIG. 8 and in FIG. 5, a further annular groove 47 is drawn in as a broken line as an alternative further feature. It starts from the recess 41, but has a smaller depth x. This makes it possible to make the locking bracket 45 thicker so that it protrudes over the cylinder surface of the cylinder core.

FIG. 9 shows a section according to bb in FIG. 6, but with a key inserted that does not have a locking extension 19 at this point and in which the key back is continuously straight at this point, as is the case with the same keys Profiling is the case that is not the subject invention correspond. Since the missing locking extension 19 does not press the housing pin 32 downward, the catch edge 35 strikes the housing pin 32 when the cylinder core is rotated clockwise and blocks the rotation.

FIG. 10 shows the section according to c-c in FIG. 6, but the key has no lowered section 43 or no locking recess 20. This would correspond to a conventional key with a straight key back. The locking bracket 45 remains in the raised position within the recess 41 of the cylinder housing, so that the cylinder core 2 can not be rotated.

11 and 12 show a preferred embodiment of the catch pin, which bears the reference number 36 here. The body 37, which extends over the entire length, has a circular cross section. The attachment part 38, however, runs only over a small part of the height of the body 37 and forms a step 39. The bores can be restricted by appropriate bores for forming the associated recesses in the cylinder core, in order to facilitate assembly. In addition, stage 39 can also be used to spring the catch pin if gravity is insufficient to move the catch pins for changed installation positions.

Fig. 12 shows the view of the catch pin from above.

Claims (10)

Cylinder lock with cylinder core and cylinder housing, the cylinder core having a key channel which is open on one side towards the plane of rotation between the cylinder core and cylinder housing, characterized in that a locking bracket (45) bridging the key channel (4) is arranged in the cylinder core (2), which is displaceable in a recess (28) of the cylinder core in the direction of the cylinder housing (1). Cylinder lock according to claim 1, characterized in that the locking bracket (45) is arranged entirely within the cylinder core (2) and the plane of rotation (8) of the cylinder housing (1) in the engagement area of the locking bracket (45) is designed continuously as a cylinder surface. Cylinder lock according to claim 1, characterized in that in the cylinder housing (1) a locking recess (41) is arranged opposite the locking bracket (45) in the 0-position of the cylinder core. Cylinder lock according to claim 3, characterized in that an annular groove (47) of a depth (x) is provided in the cylinder housing (1), the annular groove being provided starting from the latching recess (41) and the latching recess (41) having a greater depth ( Fig. 8). Cylinder lock according to one of the preceding claims, characterized in that the cylinder housing (1) has an annular groove (23) which is open to the plane of rotation (8) and in which a locking extension (19) of the key (3, 42) can be rotated, and in that area the annular groove (23) in the cylinder core (2) is provided with at least one displaceable catch pin (29, 36) which has a catch edge (35) on its end facing the key spine (18), which catches on the housing pin (32) strikes or over which the housing pin is pushed away from the locking extension (19), whereby the lock can be operated. Cylinder lock according to claim 5, characterized in that two catch pins (29, 36) are arranged on each side of the key channel between two bores (24) for pin tumblers (5). Cylinder lock according to claim 6, characterized in that the catch pins (29, 36) consist of hard metal or ceramic. Flat key for cylinder lock, which preferably has profile ribs and profile grooves on the flat sides and locking notches on the key face, characterized in that the flat key on the key back (18) has at least one locking extension (19) and at least one locking recess (20), and in that the key back ( 18) between the tip of the key and the locking recess (20) is lowered (lowering 43). Flat key according to claim 8, characterized in that the depth of the depression (43) corresponds to the depth of the locking recess (20). Flat key according to claim 9, characterized in that the lowered section (43) of the key back (18) runs parallel to the remaining section of the key back (18).

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