CZ304946B6 - Combination of a pin tumbler lock and a flat key - Google Patents

Abstract

In the present invention, there is disclosed a combination of a pin tumbler lock and a flat key, said combination comprising a core (2), which is provided with a key channel (3). First bores (21), intended for sliding mounting of spring-loaded tumblers (22), open into the key channel (3), wherein said spring-loaded tumblers (22) are arranged in a row one after other in the plane passing through the axis of rotation of the core (2). The core (2) is further provided with at least one second bore (5) opening into the key channel (3) in a direction transverse to the first bores (21), whereby in the second bore (5), there is slidably mounted a safety pin (50), whose outer rounded end can engage in the locked lock with a rounded recess (13) performed in the cylindrical cavity of a housing (1), in which the core (2) is rotatably mounted with its outer surface. The flat key (4) is provided on its wider sides with longitudinal ribs (44) and grooves (43), copying the key (4) transversal profile negatively to the transversal profile of the key channel (3). A recess (44), intended for inner end of the safety pin (50), is performed on the wider side of the key (4). In case of insertion of a correct key (4) into the key channel (3), the outer end of the safety pin (50) stays in alignment with the core (2) surface. On its narrower side, the key (4) is provided with coding, or more precisely, cutouts (41), for seating and adjustment of the tumblers (22), wherein spring-loaded locking pins (12), mounted in the housing (1) bores, bear against the other ends of the spring-loaded tumblers (22). The invention is characterized in that in the core (2) second bore (5), there is mounted a safety pin (50) of such length, that if its inner end bears against the side of the key channel (3), the outer end thereof stays in alignment with the core (2) circumference and the recess (44) for the inner end of the safety pin (50), is performed continuous through the key (4) at the level of the greatest, theoretically possible depth (Himax) of the coding, let us say, cutouts (41), on the key narrower side or thereabove in the direction to the key back.

Description

The invention relates to a combination of a cylindrical lock with a flat key provided both with coding on one of its narrow sides for spring pin tumblers and locking pins, and with recesses on at least one wider side for additional one-piece locking pins.

BACKGROUND OF THE INVENTION

Cylindrical locks with flat keys of substantially rectangular cross-section are known in which longitudinal ribs and keyways are formed in a key channel of an identical cross-section or profile in the cylindrical core, and coding in the form of slits or teeth is formed on the narrower side of the flat key to align one end of the plurality of spring pin tumblers so that the other ends thereof are flush with the surface of the cylindrical lock core, at which setting the lock core can be rotated. In order to increase the security of the lock against unauthorized opening, it is possible to add additional security elements to the lock and key. For example, DE 3123511 discloses a cylindrical lock with a flat key operating toothed slots on its narrower side of a sprung pair of pin tumblers and locking pins arranged in a row in the bores of the cylindrical core and the housing. The cylindrical core is further provided with stepped bores perpendicular to the median plane of the key channel and extending between the surface of the cylindrical core and the key channel. In each bore there is a slidably mounted bolt-shaped safety pin whose canopy-shaped head facing the outer periphery of the cylindrical core has a larger diameter than its shank facing the key channel. A canopy safety recess is formed radially opposite the head of the safety pin in the cylindrical cavity of the housing, into which the head abuts. When inserting the key with the appropriate profile and the appropriate coding on the narrower and wider side, the core can be rotated. In this case, due to the canopy head of the safety pin and the canopy safety recess in the housing, the shank of the safety pin is inserted into the key channel towards the larger flat side of the key. If the key is an appropriate key, the shank will engage the bottom of the recess in the wider flat side of the key when its head is flush with the core surface and the core can be further rotated. If this is not the key, there are two options. The first possibility is that when the shank touches the bottom of the recess, the head protrudes over the periphery of the core and the rotation of the core is blocked. A second possibility is that the head is inserted into the core so that it aligns with its outer surface without the shank resting against the bottom of the recess. As the core rotates further, the safety pin head contacts the spring-loaded locking pin, which pushes the safety pin further into the core until its shank engages the bottom of the recess in the wider side of the key while sliding the locking pin into the safety pin bores to prevent further core rotation. .

This construction increases the safety of the cylinder lock compared to a lock without safety pins, but its disadvantage is that it does not prevent the lock from being overcome by the so-called bumping method. In this way, a so-called bumping applicator is inserted into the key channel, the cross-section of which corresponds to the cross-section of the original key, and on the narrow side of which the equally deep notches and teeth are formed to impact the inner ends of the tumblers. All notches have the same depth, namely the greatest possible usable depth for the key.

The object of the present invention is to provide a cylinder lock and key for which it is not possible to form a bumping applicator to override it.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks essentially overcome and the object achieved by the combination of a cylinder lock and a flat key according to the preamble of the first claim for protection, which consists in

In the second core bore, a safety pin is positioned of such length that when its inner end abuts the side of the key channel, its outer end is flush with the periphery of the core, and the recess for the inner end of the safety pin is formed through the key at the highest theoretically possible depth of the coding or cut-out on the narrower side of the key or above it towards the back of the key.

Such a lock and key design will not allow the creation of a bumping applicator that can be inserted into the key channel and whose teeth and cutouts are able to impact the tumblers because of its longitudinal groove having a transverse recess profile in the wider side of the key and necessarily required to plunge the inner end of the safety pin, cuts off its teeth on the narrower side of the applicator from the bumping applicator.

It is preferred that the key has the smallest thickness at the point of the through recess.

This results in a short displacement of the safety pin and thus a small depth of the safety recess in the housing, which affects the size of the outer diameter of the housing or its strength.

It is preferred that the keyway recess extends into the secondary longitudinal groove formed in the bottom of the longitudinal groove facing away from the safety pin head.

Such a key design allows a minimum stroke of the safety pin and thus a minimum depth of the security recess as well as a further variation of the key profile.

It is preferred that the through recess has the shape of a truncated cone whose larger base lies on the face of the longitudinal rib, the center of the larger base lying at the level of the greatest theoretically possible depth of the slits of the key.

This provides an advantageous distribution of the forces acting on the safety pin when the core is rotated.

It is also advantageous if the key on its wider side is further provided with at least one blind recess for another safety pin.

This design is suitable for master and slave key systems.

Clarification of drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

Giant. 1 is a cross section of the lock in the locked state without a key inserted;

Giant. 2 is a cross-section of the lock in the locked state with the key inserted;

Giant. 2b is a cross-sectional view of the lock when the key is turned;

Giant. 3a - a view of the key of one alternative;

Giant. 3b is a section on A-A of FIG. 3a on an enlarged scale;

Giant. 4a is a view of the bumping applicator to the key without a recess in the wider side; Giant. 4b is an enlarged cross-sectional view taken along line B-B of FIG. 4a;

Giant. 5a is a view of the bumping applicator after forming the slot for the safety pin;

Giant. 5b is a cross-sectional view along the line C-C of FIG. 5a on an enlarged scale;

Giant. 6a - a view of the key of the second alternative;

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Giant. 6b is a cross-sectional view D-D of FIG. 6a on an enlarged scale; Giant. 6c is an enlarged cross-sectional view of the E-E of FIG. 6a; Giant. 7 is a cross-sectional view of a third alternative key.

DETAILED DESCRIPTION OF THE INVENTION

As is apparent from the enclosed figures, the cylinder lock consists of a profile housing 1 in which a cylindrical cavity 2 is rotatably mounted with a key channel 3 for a flat key 4. A plurality of first radial bores 21 are formed in the core 2 lying in a radial plane passing through the axis of rotation. The outer ends of the first radial bores 21 terminate at the outer periphery of the core and are followed in the basic position of the core 2 by blind bores 11 formed in the housing profile 1. In the blind bores pruž springs are mounted 14 on which the lower ends of the locking pins 12, whose upper ends abut on the lower ends of the tumblers 22, are displaceable in the first radial bores 21. The upper ends of the tumblers 22 abut with the correct key 4 in its slots 41 formed at its narrower side. tumblers 22 into positions, the lower ends of the locking pins 12 are located on the separating surface between the core 2 and the housing 1. The slots 41 in the key 4 have different depths with a bounce size of approximately 0.5 mm and at a normal height of the flat key approximately 8.5 mm it is possible to make nine slits 41 of different depth into the narrower side of the key 4. The depths H are measured from the dorsal side of the key 4 and the greatest depth H _max , i.e. the ninth depth, is approximately 3.75 mm from it and the smallest depth H _{m and n,} i.e. the first depth, spaced from it by approximately 7.75 mm.

A dummy applicator 6 to a key 4 having the same slots 44 as the key of Figure 3a but lacking a recess 41 is shown in Figures 4a, 4b. As shown in Figs. 3b, 4b, the bumping applicator 6 has an identical cross-section with respect to the longitudinal ribs 42, 62 and the longitudinal grooves 43, 63, but its slits 61 on the narrower side of the bumping applicator 6 are all equally deep and possible depth H _max . If the lock and key 4 were not provided with additional security elements, the lock described above could be overcome by the bumping method. In this case, the bumping applicator 6 is inserted into the key channel 3 so that each tooth on the applicator 6 has only one tumbler 22 in front of it until it is fully inserted. By striking the bumping applicator 8, the teeth 65 strike the tumblers 22, releasing the lower ends tumblers 22 from the upper ends of the locking pins 12, thereby releasing the separating surface between the core 2 and the housing 3 at which the core 2 can be rotated.

The safety features that prevent the manufacture of the bumping applicator 6 are as follows:

The core 2 is provided with a second bore 5 transverse to the first bores 21, the inner end of which opens into the key channel 3 without intersecting the first bore 21, and the outer end opens at the periphery of the core 2. a safety recess 13 with leading edges or a rounded circumference is provided. In the second bores 5 of the core 2, which is preferably fitted, a safety pin 50 is provided of such a length that if its inner end abuts the side of the key channel 3, its outer end is flush with the periphery of the core 2. The outer end is preferably provided a rounded head 51, guided in the second bores 5 in said larger diameter shoulder. When the correct key 4 is fully inserted into the key channel 3, the slots 44 align the locking pins 12 with the tumblers 22 into the non-locking position and the through recess 44 on the wider side of the key 4 is aligned against the inner end of the security pin 50 (see FIG. 2a). When the key 4 and the core 2 begin to rotate, the force of the shaped head 51 on the edge of the safety recess 13 will slide the inner end of the safety pin 50 into the recess 44 in the wider side of the key 4. flank of the key channel 3, its outer end begins to align with the periphery of the core 2 and the core can be further rotated (see Fig. 2b).

-3 CZ 304946 B6

The inner end of the safety pin 50 is shaped to provide both full insertion into the recess 44 and a reliable displacement when inserting and withdrawing the key 4 from the key channel 3.

The tip of the key 4 is shaped so that when the key 4 is inserted into the key channel 3, the safety pin 50 does not become trapped in the bore 5 in the core 2.

In order to allow the bumping applicator 6 to engage the inner end of the safety pin 50 on the side of the key channel 3 after being driven into the key channel 3 and thereby to unlock the core 2 from the housing I and to rotate it, it would have to be provided with a bumping groove 64 having a transverse recess profile. 44 (see Figs. 5a, 5b). However, it would separate the teeth 65 and the slots 61 from the bumping applicator 6, thereby depreciating it (see the shaded parts in Figs. 5a, 5b). Thus, it is not possible to produce a bumping applicator 6 to a key 4 that has both slits on its narrower side and a through recess 44 on its wider side at JT, on the _x slots 41 to allow the safety pin 50 to pass through the key 4 to the stop with the key channel 3.

Of course, it is possible to provide the key 4 with a further through recess 44 and a through recess 45 or recesses 45 (see Figs. 6a, 6b) with which other safety pins cooperate, but which are shorter than the main safety pin 50. Other safety pins need not be located in the key. equal depth H _{1; | X.} but they may be anywhere on the wider side of the key 4. They may also be situated in the same transverse plane of the core 2 as the tumbler 22. Such measures are suitable for master and slave key systems.

Another preferred embodiment is shown in FIG. 7. In the profile of this key 4, a secondary longitudinal groove 430 is formed in the bottom of the longitudinal groove 43, into which a through bore 44 for the security pin 50 results. engaging in the longitudinal groove 43 of the key 4 is also provided with a secondary rib engaging the secondary longitudinal groove 430 on the key 4.

The recesses 44 through the key 4 preferably have a truncated cone shape, the larger base of which is situated on the side of the key 4 that faces the security pin 5.

Claims (5)

Combination of a cylinder lock and a flat key, in which the core (2) is provided with a key channel (3) into which the first bores (21) for sliding bearings of the spring tumblers (22), arranged in a row rotating the core (2), and further, the core (2) is provided with at least one second bore (5) opening into the key channel (3) in a direction transverse to the first bore (21), and the second bore (5) is slidably mounted a pin (50), the outer rounded end of which, when the lock is locked, engages in a rounded recess (13) formed in the cylindrical cavity of the housing (1) in which the core (2) is rotatably supported by its outer surface; provided on its wider sides with longitudinal ribs (42) and grooves (43), forming the transverse profile of the key (4) negatively to the transverse profile of the key channel (3), wherein on the wider side of the key (4) a recess (44) is provided for the inner end of the safety pin (50), the outer end of which, when the correct key (4) is inserted into the key channel (3), is flush with the core surface (2), provided with coding or cut-outs (41) for seating and positioning of tumblers (22), the other ends of which are supported by spring-loaded locking pins (12) housed in bores of the housing (1), Characterized in that a second safety bore (50) is provided in the second bore (5) of the core (2) of such a length that if its inner end abuts the side of the key channel (3), its outer end is flush with the periphery of the core (2), and the recess (44) for the inner end of the security pin (50) is formed as passing through the key (4) at the highest theoretically possible depth (H _max ) of coding or slots (41) on the narrower side of the key (4). 4) or above it towards the back of the key. Cylinder lock and key combination according to claim 1, characterized in that the key (4) has the smallest thickness at the point of the through recess (44). Cylinder lock and key combination according to claim 2, characterized in that the through recess (44) in the key (4) results in a secondary longitudinal groove (430) formed in the bottom of the longitudinal groove (43) which faces away from the head (51). ) of the safety pin (5). Combination of a cylinder lock and a flat key according to one of the preceding claims 1 to 3, characterized in that the through recess (44) in the key (4) has the shape of a truncated cone whose larger base lies on the face of the longitudinal rib (44). lies on the level (H _max ). Cylinder lock and flat key combination according to one of the preceding claims 1 to 4, characterized in that the key (4) has blind recesses (45) on its wider side. 3 drawings