EP0900899B1 - Device for protection of a key hole against unauthorised access and vandalism - Google Patents

Abstract

The closure cap (4) covering the key hole (11) forms a hollow cavity (6) connected by an opening (7,8) with the front side (7) of the closure cap, in the extension of the key hole with a door leaf (2). The closure cap contains a security element (5) tapering towards the lock (1) and which locks with a rotary movement, for covering the key hole. The security element has at least one locking plate spring (22) which has arms shaped into runners. The opening has slotted wider parts for inserting the locking spring into the hollow cavity. A track (14) inside the cap is open towards the hollow cavity.

Description

The invention relates to an arrangement for securing a key opening Lock against unauthorized access or vandalism according to the preamble of claim 1.

The arrangement is used for locking devices of all kinds, which have a special one Protection against unauthorized access and especially against vandalism, for example from cash cassettes in a variety of different ways Cash dispensers arranged in vending machines, particularly for safes from coin-operated telephones - Machines.

An arrangement of the type mentioned is known from EP-A 754'828. A Locking cap is arranged in front of a key opening of a lock and allows one through a cylindrical opening of the cap through the key To operate the lock. A suitable one in the cylindrical opening of the cap Lock cylinder is at one end with a locking pin arranged transversely to the cylinder axis equipped. The security cylinder is used to secure the lock in advance with the locking pin inserted the opening of the cap, the locking pin through a slit-shaped Recess of a plate arranged in the depth of the opening of the closure cap is pushed. With a rotation of the security cylinder around its own axis with the help a key, the locking pin engages behind the plate with the slot-shaped recess and engages in locking springs arranged behind the plate.

This device has the disadvantage that the torque for locking and unlocking is practical is the same size, so that with a locking cap that is easy to secure, even from The lock can be unlocked by unauthorized persons.

The invention has for its object to a cap for securing a lock create in which the torque when unlocking is several times greater than when locking.

According to the invention, this object is achieved by the features specified in the characterizing part of claim 1 Features resolved. Advantageous embodiments of the invention result from the dependent ones Claims.

An embodiment of the invention is shown in the drawings and will be described in more detail below described.

Figur 1

einen Querschnitt durch eine Tür mit Schloss und Verschlusskappe sowie mit einem nicht eingesetzten Sicherungselement,

Figur 2

eine Frontansicht auf die Verschlusskappe ohne eingesetztes Sicherungs element,

Figur 3

das Sicherungselement,

Figur 4

das Sicherungselement um 90° um seine Achse gedreht,

Figur 5

das Sicherungselement in der Verschlusskappe,

Figur 6

eine andere Form des Sicherungselements,

Figur 7

einen Querschnitt durch die Verschlusskappe mit dem eingesetzten Sicherungselement,

Figur 8

eine Abwicklung einer Gleitbahn mit Gleitkufen in Stellung 0°

Figur 9

wie Figur 8, aber mit Gleitkufen in Stellung 90° und

Figur 10

wie Figur 8, aber mit Gleitkufen in Stellung 180°.

Show it:

Figure 1

a cross section through a door with lock and locking cap and with a security element not used,

Figure 2

a front view of the closure cap without the securing element inserted,

Figure 3

the securing element,

Figure 4

the securing element is rotated by 90 ° about its axis,

Figure 5

the securing element in the sealing cap,

Figure 6

another form of securing element,

Figure 7

a cross section through the cap with the security element used,

Figure 8

a development of a slide with skids in position 0 °

Figure 9

like Figure 8, but with skids in position 90 ° and

Figure 10

like Figure 8, but with skids in position 180 °.

In FIG. 1, 1 means a lock, 2 a door leaf of a safe door, 3 an opening in the door leaf 2, 4 a closure cap placed on the outside of the door leaf 2 and 5 a securing element. A recess in the closure cap 4 forms between the closure cap 4 and the door leaf 2 a cylindrical cavity 6, which has a cylindrical recess 8 via a passage 7 the front surface 9 of the closure cap 4 is connected. A housing 10 of the lock 1 has Keyhole 11, in order to operate the lock 1 a key, not shown here introduce. The keyhole 11, the cavity 6, the passage 7 and the cylindrical recess 8 have a common axis 12. The cavity 6 and the recess 8 have the same Inner radius R1, while the passage 7 has a smaller inner radius R2. The transition from the recess 8 to the passage 7 forms a shoulder 13 parallel to the front surface 9. Die Extension from the passage 7 to the cavity 6 serves as a slideway 14, also essentially parallel to the front surface 9. The surfaces of the shoulder 13 and the slideway 14 are smoothed. As in described in patent application EP-A 754'828, the closure cap 4 is placed on the door leaf 2 and riveted or, if the thickness of the door leaf 2 is sufficient, integrated directly into the door leaf 2.

The body of the securing element 5 is advantageously composed of two coaxial cylinders 15, 16, the first cylinder 15 with the smaller radius with little play in the passage 7 and the second cylinder 16 with the larger radius fit into the recess 8 with little play. The The height of the second cylinder 16 is advantageously dimensioned such that when the second cylinder 16 is on the paragraph 13 sits, the top 17 of the second cylinder 16 is flush with the front surface 9. The Transition between the two cylinders 15, 16 forms an annular surface 18 parallel to Top 17

The second cylinder 16 has a blind hole 19 with a weakly elliptical one in the upper side 17 Cross section on which a correspondingly shaped pin 20 of an assembly key 21 can accommodate. Embodiments of the assembly key 21 and the blind hole 19 are mentioned in the above Patent application EP-A 754'828 described.

The lower end of the securing element 5 has at least one symmetrical to the axis 12 trained locking spring 22, the arms of which over the lateral surface of the first cylinder 15 protrude and measured from the axis 12 are slightly smaller than the inner radius R1 Indentation 8. To secure the lock, the securing element 5 with the locking springs 22 is advanced pushed into the recess 8.

The lock 1 is arranged on the inside of the door leaf 2 and can easily be opened when the safe door is open to be replaced.

FIG. 2 shows the top view of the front surface 9 of the closure cap 4. As a passage for the Arms of the locking spring 22 (Figure 1) has the passage 7 slot-shaped extensions 23, 24 from Inner radius R2 to the inner radius R1, which the cavity 6 (Figure 1) with the recess 8th connect and are so wide that when inserting the securing element 5 (Figure 1) the arms of Locking spring 22 at the lower end of the securing element 5 through the slot-shaped Extensions 23, 24 penetrate into the cavity 6. To secure the keyhole 11 can the securing element 5 are therefore fully inserted into the recess 8 until the Annular surface 18 (Figure 1) rests on the shoulder 13 and the surface 17 (Figure 1) flush with the Front surface is 9.

FIG. 3 shows a view of the securing element 5 with the locking spring 22. The first cylinder 15 has, for example, claws 25 arranged symmetrically to the axis 12 on the free top surface, with which the locking spring 22 is held against rotation and laterally. Is conceivable also a mandrel penetrating the locking spring 22 with a square cross section, which in the Locking spring 22 engages positively and is riveted, screwed or otherwise attached. The example of the securing element 5 shown here is set up for clockwise rotation, i.e. it will rotated clockwise (direction of an arrow 26 on the outer surface of the cylinder 16) when one looks at the top 17. The locking spring 22 has two arms with the skids 27, 28, which the Securing element 5 in the cap 4 (Figure 1) can hold. The locking spring 22 is in the Area of the slideway 14 (Figure 1) deformed to the skids 27, 28, the two in the Edges of the locking spring 22 lying in the direction of rotation are bent away from the first cylinder 15. In the drawing of Figure 3, the front edge on the right and the rear edge on the left of the locking spring 22 as pulled up on a sled.

In FIG. 4, the securing element 5 is after a clockwise rotation of 90 ° about the axis 12 shown. The new position of the arrow 26 on the lateral surface of the second cylinder 16 is intended to do this suggest. The formation of the skids 27, 28 is now clearly recognizable. The skids 27, 28 enable the arresting spring 22 to run onto the slideway 14. For reasons of elasticity are advantageous instead of a single thick locking spring 22, two thinner spring plates, the Locking spring 22 and a flat spring leaf 22a, used, the locking spring 22 with the Skids 27, 28 between the spring leaf 22a and the free circular area of the first cylinder 15 is arranged. The claws 25 hold the locking spring 22 and the spring leaf 22a together and prevent the two spring leaves from twisting relative to the first cylinder 15.

5 shows the view from the cavity 6 (FIG. 1) onto the securing element 5 used (Figure 1) shown. The slideway 14 (FIG. 1) is divided into four flat sections 29, 29 ', 31, 31', of which the plane with the opposite sections 29, 29 'and 31, 31' from the front 9 (Figure 1) measured have a different distance. Sections 29 and 31 'and the Sections 31 and 29 'are separated by extensions 23 and 24, respectively, and between sections 29 and 31 there is a rest area 30 and between the sections 29 'and 31' there is a rest area 30 '. The The bottom of the two locking fields 30, 30 'are at least deeper than that by the thickness of the locking spring 22 Level of the first sections 29, 29 'worked into the material of the closure cap 4. The In another embodiment, locking spring 22 is inserted into a groove 32 in first cylinder 15 and secured with a screw 33. When the securing element 5 was inserted, the locking spring 22 aligned along the line A - A '. After clockwise rotation of the securing element 5 by 90 ° Skids 27, 28 snapped into the locking areas 30, 30 ', so that the securing element 5 in the Cap 4 is anchored.

In FIG. 6, the cross section A-A '(FIG. 5) illustrates the design of the slideway 14 (FIG. 1). The levels of the sections 29 and 31 of the slideway 14 visible here and the one shown in dotted lines The plane of the grid 30 are parallel. The level of the rest area 30 is closest to the front side 9 and the plane of the second section 31 is farthest from the front 9.

The securing element 5 here has the special shape of a truncated cone with the axis 12, which in a correspondingly shaped opening is inserted in the closure cap 4 of the door leaf 2 and extends from the front 9 to the cavity 6. The opening widens evenly from Inner radius R2 at the transition to cavity 6 to the value of inner radius R1 on the front 9.

FIG. 7 shows the closure cap 4 in cross section with the securing element 5 used according to the embodiment of FIG. 1. When the securing element 5 is inserted, the skids 27 (Figure 1), 28 of the locking spring 22 through the extensions 23, 24 of the passage 7 (Figure 1) pushed into the cavity 6. As soon as the surface 17 is flush with the front 9, one runs Clockwise rotation of the securing element 5 about the axis 12, the sliding skid 28 via a leading edge 29a on the first section 29 'of the slideway 14, the locking spring 22 being tensioned. The skid 28 then slides on the first section 29 '. After completing the Clockwise rotation of 90 °, the locking spring 22 partially relaxes because the skid 28 on the deeper as the first section 29 'arranged bottom of the rest area 30' sinks. In this in FIG. 7 Drawn position, the securing element 5 is secured in the cap 4. When unlocking is to be turned in the same direction so that the skid 28 to the height of the second section 31 'is raised. This requires a much greater torque than when securing, because the locking spring 22 experiences a greater deflection (deflection). The skid 28 slides on the second section 31 'until reaching the extension 24. As soon as the skid 28 with the Skid end 34 slides over a section end 35 'of the second section 31', the snaps Locking spring 22 in its rest position and relaxes. The securing element 5 is unlocked and can can be removed from the cap 4. The lock 1 (Figure 1) is now for actuation Approved.

The corresponding process also takes place simultaneously in the case of the illustration in FIG. 7 cut away and therefore not visible parts with the reference numerals 27, 29, 29b, 30, 31, 34 and 35th

Figures 8 to 10 show the development of the lateral surface 36, 36 'of the passage 7 (Figure 1) the profile of the slideway 14 (FIG. 1) as a function of the angle of rotation α with the three important positions of the skids 27, 28 and illustrate the process of securing and unlocking the lock 1 (Figure 1). Since the process is repeated after 360 °, these parts are dotted

In FIG. 8, the securing element 5 (FIG. 7) is completely in the opening for securing Cap 4 (Figure 7) inserted, the skids 27, 28 through the extensions 24, 23rd reach cavity 6 through it. The slide shape of the skids 27, 28 is selected so that it is a right turn, i.e. in the direction of a positive angle, easily through the drive-on edges 29a, 29b onto the first sections 29, 29 'are raised, the locking spring 22 (Figure 7) under tension is set. A left turn, i.e. towards negative angle, is due to a lack of bending at the skid end 34, 34 'of the skids 27, 28 is impossible because the skid end 34, 34' of the vertical wall of extensions 23 and 24 at section end 35 and 35 'and lift the skids 27, 28 on the slide 14 is therefore impossible. As soon as the angle of rotation reaches α = 90 ° is, the skids 27, 28 snap into the locking areas 30, 30 ', the locking spring 22 partially is relaxed.

FIG. 9 shows the situation of the skids 27, 28 with one in the closure cap 4 (FIG. 7) secured securing element 5 (Figure 7). The usual left turn to unlock the Securing element 5 is not possible because the skid ends 34, 34 'when trying a Turn to the left immediately at the vertical boundaries of the grid areas 30, 30 'and another Prevent left turn. To unlock the securing element 5 must necessarily continue be turned to the right. The skids 27, 28 must be level with the second sections 31, 31 ' can be raised, the locking spring 22 (Figure 7) much stronger than in the process of securing is excited. The torque required for unlocking is therefore very high and wakes you up Unauthorized persons have the impression that the safety element 5 is unlocked in a different way. This improvement over the device from the aforementioned patent application EPA 754,828 is already deterring most unauthorized persons from attempting further. Only with one Form-fitting assembly key 21 (Figure 1), the necessary torque can be applied. at the clockwise rotation, the skids 27, 28 slide on the second sections 31, 31 'in the direction of Angle of rotation α = 180 °.

In Figure 10, the skids 27, 28 have reached the extensions 23, 24 and the securing element 5 (FIG. 7) can be seen from the closure cap 4 (FIG. 7).

In a practical embodiment according to FIG. 1, the closure cap 4 is on the door leaf 2 riveted. The height of the cylindrical cap 4 is 20 mm, the diameter of 75 mm. The The inner radius R1 (FIG. 2) of the recess 8 and the inner radius R2 (FIG. 2) of the passage 7 have the values 23.0 mm and 15.3 mm. The paragraph 13 is lowered by 6.0 mm from the front panel 9. The plane of the first sections 29, 29 '(FIG. 8) of the slideway 14 is 13.2 mm from the front plate 9 removed, while the plane of the second sections 31, 31 'at 14.2 mm further from the front plate 9 is removed. The bottom of the latching fields 30, 30 'is spaced 12.0 mm from the front plate 9. The second Cylinder 16 of the security element 5 has a play of 0.5 mm in the recess 8 and the first Cylinder 15 is 0.6 mm narrower in diameter than passage 7. The level of the locking spring in the relaxed state is 11 mm from the surface 17. The locking spring 22 in Figure 5 is 12 mm wide and measures 44 mm in length overall.

Instead of the two-armed locking spring 22 described here, there are also three, four or more arms Locking springs 22 can be used. The multi-arm locking springs 22 require a finer division the slideway 14 and an increase in the number of extensions 23, 24.

Claims (7)

1. Arrangement for securing a lock (1) against unauthorised access or vandalism, with a locking cap (4) covering a keyhole (11), said locking cap when mounted forming in extension of the keyhole (11) a cavity (6) that communicates via an opening (7, 8) with a front face (9) of the locking cap (4) and receives a safety element (5) of fitting shape that covers the keyhole (11), can be locked in place with a rotating movement, and when mounted is tapering off toward the lock (1), characterized in that
   the safety element (5) on its tapered side is arranged so as to be secured by at least one leaf-shaped check spring (22, 22a) against further rotation,
   arms of the check spring (22) protruding beyond the tapered side of the safety element (5) are deformed into skids (27; 28),
   the opening (7) has slot-shaped widened sections (23; 24) for inserting the check spring (22, 22a) into the cavity (6), and
   a track (14) that is formed in the locking cap (4), is open toward the cavity (6), and is interrupted by the widened sections (23; 24) is formed in such a way that, after a predetermined rotation of the safety element (5) inserted into the locking cap (4), the skids (27; 28) are lifted to first sections (29; 29') while check spring (22, 22a) is tensioned, and while reaching behind the opening (7) hold the safety element (5) fixed in the opening (7, 8).
2. Arrangement according to claim 1, characterized in that the track (14) has recessed resting fields (30; 30') offset by 180° designed to receive the skids (27; 28) after their rotation by a predetermined angle of rotation, in that the resting fields (30; 30') are shaped in such a way that for release of the safety element (5), the skids (27; 28) that have snapped into the resting fields (30; 30') can only be moved by a rotation in the same sense of rotation while passing via second sections (31; 31') of the track (14) to the widened sections (24; 23).
3. Arrangement according to claim 2, characterized in that the check spring (22, 22a) undergoes a larger deflection in the second sections (31; 31') than in the first sections (29; 29').
4. Arrangement according to one of claims 1 to 3, characterized in that the body of the safety element (5) includes two cylinders (15; 16) having different diameters, the second cylinder (16) with the larger diameter having on its free surface (17) at least one blind hole (19) sunk into the safety element (5) and receiving pegs (20) of fitting shape of an assembly key (21).
5. Arrangement according to one of the claims 1 to 3, characterized in that the body of the safety element (5) is a truncated cone whose larger-diameter circular surface (17) has at least one blind hole (19) sunk into the safety element (5) and receiving pegs (20) of fitting shape of an assembly key (21).
6. Arrangement according to one of the claims 1 to 5, characterized in that the outer surface (17) of the safety element (5) inserted into the locking cap (4) is flush with the front face (9) of the locking cap (4).
7. Arrangement according to one of claims 1 to 6, characterized in that the locking cap (4) is integrated into the door leaf (2).

Images