LT5760B - Cylinder lock with a flat key - Google Patents

Abstract

A cylinder lock with a flat key comprised of a cylinder plug (2) provided with a key channel (21) and mounted within a cylindrical cavity of a housing (1) in which spring-biased blocking pins (11) are located within bores arranged in series to engage tumblers (23) mounted in the plug (2) and controlled by a first coding (31) disposed on a first narrower side of the flat key (3), wherein the second coding (32) on the second narrower side of the key (3) controls first faces of sickle-shaped blades (4), which are slidably mounted in arched grooves (24) formed on the perimeter of the plug (2) and urged for contact with the second coding (32) by a spring (44), the other end of which being supported by the plug (2), wherein the sickle-shaped blades (4) are provided with unblocking recesses (41) on the external perimeter thereof to push out in radial direction a longitudinal blocking bar (26) extendibly mounted in radial direction within the plug (4) and cooperating with a longitudinal blocking groove (

Description

The cylindrical lock has a flat key with a first cutout combination on the lower underside of the key controlling the key sliding pins between the cylindrical core and the lock body, and a second key cutout combination on the upper side of the key guiding the cutter bar blades . With this second key cut combination, the rotating side locking latch can be used to prevent at least one sickle-shaped blade from being unlocked in a so-called dynamic (or "cylindrical core punching") manner.

TECHNICAL LEVEL

EP0211602 discloses a cylindrical lock with a flat key in which a first cutout combination on the first narrow side of the key controls key-sliding pins mounted in the cylindrical core arranged sequentially in the longitudinal plane of the key channel. The key sliding pins work in conjunction with the spring-locked locking pins incorporated in the profiled housing, and the second key slot combination on the second narrower side of the key controls the sickle blades mounted in the curved grooves on the peripheral surface of the cylindrical core to reduce force. Also used is a longitudinal locking latch mounted in the cylindrical core in a radial direction and set in the locking position in the longitudinal locking groove in the cylindrical core of the housing. after inserting a suitable key, the first key cut combination sets the key sliding pins so that their ends pressed by the springs tighten the leading edges of the locking pins between the cylindrical core and the lock body, and the second key cut combination sets the cutter blade type so that located in front of the longitudinal locking latch, and turning the cylindrical core with a key would enter the longitudinal locking latch into a cam-type notch. At this point, the return spring will be inside the curved groove in the cylindrical core and rest on the one side of the front edge of the sickle blade and on the other side the cylindrical core.

The advantage of such a lock design is the abundance of combinations offered by the two key notch systems, and the disadvantage is the persistence of unauthorized lock unlocking by dynamic (or "cylindrical core punching") operation.

THE SUBSTANCE OF THE INVENTION

The invention also encompasses the construction of key sliding pins and / or locking pins which are intended to provide protection against unauthorized unlocking when the upper part of the key sliding pin does not reach the lower "knock out" key used during "cylindrical core punching" and thus "cylindrical core punching". the key cannot "punch" the cylindrical core. The basis of the design is to limit the movement of the spring-loaded locking pin, which encourages the use of the first key cutout combination for the key-sliding pin, and therefore can only be used for short (size 0 to 4) key-sliding pins. This results in fewer combinations.

It is an object of the present invention to provide an improved lock with key sliding pins and a sickle blade sliding side locking latch that provides lock locking protection dynamically and, at the same time, guarantees the highest possible number of combinations.

In order to achieve the object of the invention for a cylindrical lock with a flat wrench and to avoid the aforementioned drawbacks, the construction of a cylindrical lock with a wrench must be as described in the first paragraph of the definition. The key feature of this lock is the loop on the inner circumference of the sickle blade for engagement with the first end of the spring; the other end of the spring is fixed in a cylindrical core notch.

This design allows the other side of the sickle-shaped blade to be used as an additional security feature to block or respectively restrict the movement of the key-sliding pin when using a dynamic lock release method. Such spring-loaded sickle-shaped blades allow only the side locking latch to be used, or both the side locking latch and the key sliding pin can be locked. This ensures cost-effective production of locking systems with varying levels of security.

Useful if the notch is blind and has an axis parallel to the key axis of the key sliding pin and engages with a curved groove. The notch formed in this way can be fitted with a spring that gently pushes the sickle blade into contact with the second combination of the key notch.

It is also useful to have a blocking member on the reverse side of the sickle-shaped blade adapted to create at least a stop contact with the adjacent key sliding pin. In the dynamic lock release method, this design should ensure that the locking pin is stopped by the locking element on the other side of the sickle blade when the "cylindrical core punch" key is used. This severely limits the amount of movement energy directed to the spring-loaded locking pin and prevents the locking pin from being inserted fully or at the required time, thus preventing rotation of the cylindrical core and lock release.

It is also useful if the blocking member is in the form of a lateral projection; the blocking member exits the sickle-shaped blade and enters the recess in the lower part of the key-sliding pin. This design is more appropriate due to the technology used.

It is also useful if the cam-type notch in the sickle-blade ends at the deep bottom level on the side opposite the second key-cut combination. In dynamic mode, this arrangement ensures a smooth and uninterrupted movement of the sickle-shaped blade, even when the side locking latch is slightly inserted into the cylindrical core due to the necessary gaps between the individual parts of the lock.

It is also useful if the sickle blade with the locking element is adjacent to the last key sliding pin towards the outside of the cylindrical core. This arrangement does not limit the number of sickle blade combinations that can be selected. These blades are controlled by the second key cut combination on the upper side of the key.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

The drawings show the construction of the invention:

Fig. - longitudinal section of the cylindrical lock with the key inserted;

Fig. - perspective schematic view of a cylindrical lock with a key inserted;

Figure 3a - sectional view along line A-A in Fig. 1. without key;

Figure 3b - sectional view along line A-A in Fig. 1. with key inserted;

Figure 3c. - sectional view along the line A-A in Fig. 1 when the lock is opened dynamically;

Figure 4a - schematic view of a short sickle-shaped blade;

Figure 4b - schematic view of another short sickle-shaped blade;

Fig. - schematic view of a long sickle-shaped blade with a blocking element;

Fig. - perspective view of a long sickle-shaped blade with the key sliding pin blocked.

PREFERRED EMBODIMENTS

As shown in the drawings, the cylindrical lock comprises a profiled body 1 with a cylindrical cavity having a cylindrical core 2 with a key passage 21 into which a flat key 3 is inserted. The upper sides of the radial cavities in the cylindrical core engage the key passage 21. The upper sides of the key-sliding pins 23 cooperate with the first key-slot combination 31 on the lower, narrower side of the flat key. The lower sides of the key-sliding pins 23 push the front sides of the spring-locked locking pins 11 provided in the holes 12 of the housing 1. These apertures 12 are disposed in the same axis with the corresponding slots 22 of the cylindrical core 2 when the cylindrical core is in the locking position.

The cylindrical core 2 (between the radial slits 22) has curved grooves 24 (see Fig. 2-3c) which intersect the key channel 21 at right angles. The curved grooves 24 are fitted with sickle-shaped blades 4 which are similar to a circular cutout. The cylindrical cavity wall 1 and at least a portion of the inner curved side are guided to the bottom of the curved groove 24. The outer curved sides of the sickle-shaped blades 4 form cam-shaped grooves 41 with a profiled bottom (shallow bottom 410 and deep bottom 411).

The cylindrical core 2 has a longitudinal lateral groove 25 intersecting the curved grooves 24 and in which the locking catch 26 is mounted radially. A spring, not shown in the drawing, pushes the locking catch 27 to enter the longitudinal locking groove 13 in the cylindrical cavity of the housing 1. When the latch is inserted into the locking groove 13 and the shallow bottom of the cam type groove 41 in the sickle blade 410 contacts the inner wall, rotation of the cylindrical core may not be possible (see Fig. 3a). If the position of the sickle blade 4 is reversed so that the lower deep side 411 is positioned opposite the locking latch 26 by rotating the cylindrical core 2, the locking latch 26 is pushed out of the locking groove 13 and fully inserted into the longitudinal lateral groove 25 of the cylindrical core 2. a cam-type notch in the sickle-shaped blade 4 (see Fig. 3b).

Positioning of the sickle blade 4 is effected by a second key cutout combination 32 on the lateral upper side of the key 3, into which one side of the sickle blade 4 is pressed by a spring 44. The spring 44 undergoes both bending and compression stresses. , the inner end 4 of the curved blades, the second end being formed in the notch 27 of the cylindrical core 2. The notches 27 are formed as blind holes whose axes are parallel to the slots 22 of the key sliding pin 23 and which engage the curved grooves 24. A spring, leaf spring, pin or other type of spring 44 may also be used. The loop 42 may be formed as a notch or similar shape. It is very important that the spring 44 does not come into contact with the first or second half of the sickle-shaped blade 4, since the first half cooperates with the second key cutout combination 32 and the second half may have a blocking element 43.

The other side 4 of the sickle-shaped blade has a locking member 43 which is in contact with the edge 231 of the key-sliding pin 23 if the sickle-shaped blade 4 is placed in the furthest position (see Fig. 3c). This occurs only after the first half of the sickle-shaped blade has been pushed with the "shutter release" key, using the dynamic lock release method. The figure shown shows a lateral projection 431 of the blocking member 43 of the sickle-shaped blade 4.

As shown in Figures 4a, 4b, the sickle-shaped blades 4 used only for controlling the side locking blades are shorter than the sickle-shaped blades 4 used to lock the key-sliding pins 23. The shorter sickle blades 4 have an angular length of about 100 ° with the side locking latch 26 in one quarter of the circumference of the cylindrical core 2 as measured from the upper side of the key channel 21 and the longer sickle blades 4 having an angular length of about 170 ° to 190 °. so that their other side with the locking member 43 can work with the key sliding pins 23. To prevent a reduction in the number of combinations, it is useful to add an additional sickle blade 4 with the locking member 42 to the last key sliding pin 23 as shown in Figure 1.

When a suitable key 3 is inserted into the key passage 21, the key sliding pins 23 contact their upper sides, the first key cutout combination 31 on the lower narrower side of the key 3, and change the position of the locking pins 11 so that their upper sides are between the cylindrical core 3. At the same time, the second key cutout combination 32 on the upper side of the key 3 locates the sickle-shaped blades 4 such that the deep cam-type cut-outs 411 face the side locking latch 26. After a further rotation of the cylindrical core 2, the side locking latch 26 is pushed out of the longitudinal locking groove 13 in housing 1.

To open the lock dynamically, the "lock knock" key is inserted into the key passage in place of the first and second key cut combinations so that the spring pushes the cylindrical core 2 in the required direction while the "lock knock" key is simultaneously pushed into the key passage 21. the first key cutout combination may in theory be locked in place only by the longer key sliding pins 23 and the locking pins 11. The latter set the key-sliding pins 23 into the openings 12 so that when the locking pins 11 move in the opposite direction they can set the cut-off angles 22 between the cylindrical core 2 and the housing 1 and the lock can be unlocked.

the insertion angles at the location of the second key-slot combination may theoretically tilt the sickle-shaped blades 4 so that the lateral locking latch is inserted into the deep portions 411 of the cam-type notches 41 and the lock can be unlocked. To prevent the lock from being unlocked, the other side of the sickle-shaped blade 4 has a locking member 43 which, when the "lock knock" key is pushed into the cylindrical core 2, pushes against the adjacent key sliding pin 23 and stops or restricts the movement of the key lock key. Therefore, by virtue of this design, the dynamic stroke of the blade 4 is used to stop or mitigate the dynamic stroke on the key-sliding pin 23.

Claims (6)

DEFINITION OF INVENTION 1. A cylindrical lock having a cylindrical body with a flat key for locking / unlocking a cylindrical lock, characterized in that the cylindrical lock consists of a cylindrical core (2) with a key passage (21) and is mounted in a housing of a cylindrical form (1). wherein successive apertures are provided with spring-locked locking pins (11) in contact with key-sliding pins (23) in the same apertures of the cylindrical core (2) controlled by a first key cut-out combination (31) in the first narrower panel (31). 3), while the second key cutout combination (32) on the second narrower side of the key (3) locates the first sides of the sickle-shaped blades (4) which are inserted in the curved grooves (24) on the circumference of the cylindrical core (2) and spring. (44) pressed into contact with second key cutout combination (3) 2) when the other end of the spring rests on the cylindrical core (2) and the sickle blades (4) have, on the outer circumference, unlocking recesses (41) through which the longitudinal locking latch (26) disposed radially in the cylindrical core 2) and cooperating with a longitudinal locking groove (13) formed in the cylindrical cavity of the housing (1), the inner circumference of the sickle-shaped blade (4) having a loop (42) for engagement with the first end of the spring (44), The end (44) is fixed in a notch (27) formed in the cylindrical core (2). 2. Flat-cylinder lock according to claim 1, characterized in that the notch (27) is formed as a blind hole, the axis of which is parallel to the axis of the cut-out (22) of the key-sliding pin (23) and extends into the curved groove (24). . Flat cylinder lock according to Claim 1 or 2, characterized in that it has a blocking element (43) on the other side of the sickle blade (4), which is adapted at least to create a stop contact with the adjacent key sliding pin (23). 4. A flat-cylinder lock according to claim 3, characterized in that the blocking element (43) is executed in the form of a side projection (431), whereby the element comes out of the sickle-shaped blade (4) and enters the recess (231) in pin (23). 5. A flat lock with a flat key according to claim 3 or 4, characterized in that the cam-type notch (41) in the sickle blade (4) ends at a deep bottom level (411) on the side opposite the second key (3). cutout combination (32). 6. Flat cylinder lock according to at least one of Claims 3 to 5, characterized in that the sickle blade (4) with the locking element (43) is arranged adjacent to the last key sliding pin (23) facing the cylindrical core (23). 2) Outer sides.