DE9318001U1 - Lock - Google Patents

Description

Lock

The invention relates to a lock with a bolt that is spring-loaded in the locking direction and is held in an open position ready for closing by a catch that can be triggered by an auxiliary latch, with a lever with the aid of which the bolt can be moved into its open position by actuating a handle, a rod or the like, and with a lock having an electromagnet for this actuation.

A known lock of this type (DE-PS 37 00 891) has various advantages. The most important advantage is that not only does the latch keep the door closed when it has been closed, but that in this case the bolt is also automatically extended so that the door is locked regardless of whether it is operated with the key. It can then be opened again with a key. Normally, the door should only be able to be opened with the key and not by operating a handle, a bar or the like. In order to be able to use the door as an emergency exit in an emergency, the lock that prevents the door from being opened with the handle, a bar or the like can be removed, which can be done by switching off the

Dresdner Bank AG Hamburg 04 030Hil£00 (QLZ 300^00. Op) : ffos{giro:Hamburg 1476 07-200 (BLZ 200 100 20)

electromagnets. This mode of operation is very safe, as the door can be opened even if the power supply fails (i.e. it can usually only be opened from the inside, as this is the only place where a handle, rod or similar is provided).

It would be conceivable to use this arrangement for access control, where only a person who can identify themselves using a coded card, for example, is granted access. In this case, the circuit would have to be designed in such a way that the electromagnet is permanently energized and is only switched off when the person authorized to access logs in with their card. However, this high power consumption makes it impossible to carry out access control using battery-operated circuits, which is of great importance because a battery power supply avoids very complex installation work compared to a mains power supply.

The object of the invention is to create a lock of the type mentioned at the outset, which has the advantages of the known lock, but can also be used in a very advantageous manner in connection with an electrically or electronically designed access control system.

The solution according to the invention consists in that the lock can be released by pivoting a spring-loaded locking member towards its locking position, which can be pivoted by energizing the electromagnet and engages in this position, wherein the engagement can be released by energizing a second electromagnet.

In order to release the lock, the electromagnet only needs to be excited briefly, which can also be done with power from a battery. The locking element then remains in the position in which it does not hinder the opening of the door. It remains in

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This position remains until the locking element is released again by the excitation of a second electromagnet and automatically returns to the locking position due to the spring load. Only a short current impulse is therefore required to cancel the release or to lock it again.

Due to these properties, the lock can be used in a variety of ways, especially in systems with battery-operated access controls. The lock can be designed in such a way that when locked, it cannot be moved into the open position from either side. From either side, only one person can get through the door who can prove their access authorization using appropriate means (coded card, numeric entry or similar). In many other cases, however, it will not be necessary to restrict passage in both directions, but rather the intention is that the door can always be used as an emergency exit in one direction. In this case, the lock will only work when the handle, bar or similar is operated on one side of the door. If the handle, bar or similar is operated on the other side of the door, the lock will not work. Compared to the previously known lock, the advantage is that one can always get through the door from one side and it is not necessary to switch off the electromagnet that keeps the door locked for this purpose. In this respect, you get a higher level of security.

This effect is achieved in a particularly useful embodiment by dividing the handle nut into two parts, each part being connected to a handle, rod or the like on one side of the door and the locking member only acting on one part of the handle nut.

If the locking element can be moved to act on one or the other part of the handle, the lock can be used more versatilely by being installed in doors

where access from one side or the other should always be possible.

A further advantageous embodiment is characterized by the fact that the handle nut is divided into two parts, each part is connected to a handle, rod or the like on one side of the door and the locking element acts on both parts of the handle nut. In this case, essentially the same lock can be used, which always allows passage from one side, whereby only a different locking element has to be used if one is only to be able to get through the door from both sides after proving one's access authorization.

A particularly advantageous feature of the lock according to the invention is that it can be designed without a mechanism that is operated with a key. This advantageous embodiment has the advantage that the lock can only be opened with the help of electronic access control, which can offer significantly better protection against unauthorized access than a key. Although the option of operating it with a key is dispensed with, the full security of a door is still obtained, which is also locked with the bolt after closing and not just with the latch, since the bolt automatically moves into the closed position due to the action of the auxiliary latch when the door is closed.

An advantageous embodiment is characterized in that the lock has a sensor for the auxiliary latch actuation. This sensor can be connected to a circuit by which the locking member can be released into the locking position by energizing the second electromagnet when the auxiliary latch is actuated. This is particularly advantageous in the following application.

If an authorized person has registered properly, the lock will normally be unlocked for a

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limited time of perhaps five seconds, so that the person has the opportunity to open the door calmly. If the person is in a hurry, after the door has closed, an unauthorized person could possibly open the door within these five seconds. This is prevented by the sensor and the associated circuit. In addition, the sensor could be connected to circuits located inside and/or outside the lock, which, for example, immediately switch off a control lamp after the door has been closed, which signaled that the door was ready to open, which in turn saves energy, which is particularly important for battery-operated systems.

The invention is described below using an advantageous embodiment with reference to the accompanying drawings. They show:

Fig.l the lock of the invention in the open state and

in plan view in a first position, and Fig.2 the lock in another position.

The lock case 1 is closed on the front by the faceplate 2, which has openings for the door latch 3, the auxiliary latch 4 and the bolt 5. The bolt 5 has an elongated slot 6 with which it is slidably mounted on the tour pin 7. The bolt 5 is spring-loaded into the closed position by a spring 8 with a spring force directed to the left in the figures.

In this position, the bolt 5 is held by the bolt locking mechanism 9, which is pivotably mounted on an axis 10. A locking device 11 is also pivotably mounted on this axis 10, by means of which the bolt 5 can be held in the open position. Both the bolt locking mechanism 9 and the locking device 11 can engage in a groove 12 of the bolt 5. Bolt locking mechanism 9 and

The locking device 11 is subjected to spring force in opposite directions by a spring 13 shown in dashed lines. The bolt locking mechanism 9 is spring-loaded in the figures in an anti-clockwise direction, while the locking device 11 is spring-loaded in a clockwise direction.

The auxiliary latch 4 has a slot 14 with which it is slidingly guided by a pin 15. It is spring-loaded into the outward-pointing position by a spring 16 and has an inclined surface 38 at the lower end which is intended for releasing the locking device, as will be described further below.

A spring 39 pushes the door latch 3 outwards into the closed position. This door latch 3 can be moved to the right into the open position by turning the handle nut 17 clockwise, by a corresponding projection 18 of the handle nut engaging a corresponding projection 19 of the door latch. In this case, not only the force of the spring 39 must be overcome, but also that of the handle holding spring 20.

On the other hand, as is known, the door latch 3 can also be opened with a profile cylinder that is inserted into the profile cylinder opening 21. The corresponding opening movement, which is described below, is carried out via a lever 22 that is attached to the lock case 1 with a pin 23.

A further lever 25 is rotatably attached to the lock case 1 by means of a pin 24. This lever has a nose 26 on its lower part, which is intended for releasing the bolt tumbler 9, as described further below. In the normal state, a lower area 27 is at a certain distance from a locking pin 28 arranged on the bolt 5. At its upper end, the lever 25 can be moved to the left by a corresponding projection 29 on the handle nut 17.

when the follower 17 is turned clockwise in the direction of an opening movement.

However, this opening movement is normally prevented by a locking member 40 which is arranged so that it can pivot on a pin 41. This locking member 40 is connected at the bottom to the armature 42 of an electromagnet 43, whereby the locking member is spring-loaded in an anti-clockwise direction by the force of a spring 44 which surrounds the locking member 40 at the top. When the lock is closed, the locking member 40 has the position shown in Fig. 1. If current briefly flows through the electromagnet 43, the locking member 40 is pivoted clockwise against the force of the spring 44 so that the projection 45 of the locking member 40 no longer engages behind a corresponding projection 46 of the handle nut 17, so that the door can be opened. At the same time, however, the downwardly spring-loaded armature 47 swings a second electromagnet out and behind the pivoted-away upper projection 49 of the locking member 40, so that the locking member 40 remains in its non-locking position. The locking member 40 returns to the locking position when the second electromagnet 48 is briefly excited, so that the armature 47 is pulled upwards again and releases the locking member 40.

The way the lock works is as follows.

In the position shown in Fig. 1, the lock is in its locking position. It can be opened, for example, with a profile cylinder that is inserted into the profile cylinder opening 21 and turned clockwise. The locking bit of the profile cylinder then initially hits a projection 35 of the lever 25, which is then pivoted slightly anti-clockwise until the part 27 strikes the locking pin 28. During this pivoting movement, however, the locking catch 9 has been pivoted clockwise by the nose 26, so that the bolt 5 is no longer held in its locking position. By turning the

The bolt can then be turned into the open position shown in Fig. 2 until the locking device 11 snaps into the groove 12 and thus holds the bolt in the open position. If the key is turned further, the arm 22 is pivoted around the pin 23 in a manner known per se, since the profile cylinder bit strikes a projection 36 of the arm 22. This also brings the latch 3 into the open position. If the door is then closed again, the auxiliary latch 4 is pushed in, whereby the locking device 11 is rotated anti-clockwise by the inclined surface 38, so that the bolt 5 can move back to the left into the closed position until the bolt tumbler 9 snaps into place again as shown in Fig. 1.

So once the door has been opened with a key, it will return to the position with the bolt 5 locked once it has closed again. As already mentioned, however, a profile cylinder is not required. The lock can be made without the possibility of being opened with a profile cylinder. Closing and locking with the bolt 5 is done by closing the door with the help of the auxiliary latch 4. Opening takes place under suitable control by the electromagnets 43 and 48 simply by operating the handle nut 17 with the door handle, a rod or the like. If the locking member 40 is pivoted clockwise by temporarily energizing the electromagnet 43 and is held in this position by the downwardly spring-loaded armature 47 of the second electromagnet 48, the projection 45 of the locking member 40 no longer rests against the projection 46 of the handle nut 17. The follower can then be turned clockwise.

In this case, the latch 3 is brought into the open position via the projection 18 of the follower 17 in a manner known per se. At the same time, the lever 25 is turned counterclockwise.

pivots. Since the lower part 27 of the lever 25 does not initially touch the locking pin 28, the projection 26 initially releases the locking latch 9. When the handle and the follower 17 are turned further, the part 27 of the lever 25 then pushes the locking pin 28 and thus the latch 5 to the right into the open position until the locking device 11 holds the latch 5 in the open position. The door is then open and can be opened again and again until current flows through the magnet 48 again.

As can be seen from the figures, the locking member 40 is designed in two parts, in that it has a part 50 detachably connected to it, which can be used in a split handle so that it only acts on one or the other part of the handle. Instead, a part 50 can be used that acts on both parts of the handle, depending on whether access is to be possible from one side or the other or from neither side without access authorization.

At 51, a sensor for the position of the auxiliary latch 4 is shown. If the auxiliary latch 4 is pushed in when the door is closed, the sensor 51 emits a signal that can be used to energize the electromagnet 48 so that the locking member 40 moves into the locking position and no unauthorized person can then open the door. Any indicators for the readiness to pass through the door opening, etc. can also be switched off in order to save power.

Claims (10)

• · Protection claims 1. Lock with a bolt that is spring-loaded in the locking direction and is held in its open position ready for closing by a catch that can be triggered by an auxiliary latch, with a lever with the aid of which the bolt can be moved into its open position by actuating a handle, a rod or the like, and with a lock having an electromagnet for this actuation, characterized in that the lock can be released by pivoting a locking member (40) that is spring-loaded in the direction of its locking position, which can be pivoted by energizing the electromagnet (43) and engages in this position, the engagement being reversible by energizing a second electromagnet (48). 2. Lock according to claim 1, characterized in that the lock only acts when the handle, the rod or the like on one side of the door is operated. 3. Lock according to claim 2, characterized in that the handle nut (17) is divided into two parts, each part is connected to a handle, rod or the like on one side of the door and the locking member (40) only acts on a part of the handle nut (17). 4. Lock according to claim 3, characterized in that the locking member (40) can be moved so that it acts on one or the other part of the follower (17). 5. Lock according to claim 2, characterized in that the handle nut (17) is divided into two parts, each part is connected to a handle, rod or the like on one side of the door and the locking member (40) acts on both parts of the handle nut (17). 6. Lock according to one of claims 1 to 5, characterized in that it is designed without a locking cylinder to be operated with a key. 7. Lock according to one of claims 1 to 6, characterized in that it has a sensor (51) for the auxiliary latch actuation. 8. Lock according to claim 7, characterized in that the sensor (51) is connected to a circuit by which when the auxiliary latch is actuated, the locking member (40) can be released into the locking position by excitation of the second electromagnet (48). 9. Lock according to claim 8, characterized in that the circuit is connected to circuits arranged outside the lock (1). 10. Lock according to claim 9, characterized in that the circuit is connected to circuits arranged inside the lock (1).