DE29812820U1 - Door locking device - Google Patents

Description

Machine tool factory VOGTLAND GmbH
Schenkendorfstrasse 14
08525 Plauen

16.07.1998 Door security device

The invention relates to a safety device for two sliding doors that can be moved against each other and whose sliding paths are parallel and close together. In particular, in the case of processing modules for transfer lines, special machines and stand-alone modules, easy access to all units and assemblies of the processing units must be designed in a user-friendly manner. It is therefore recommended that the protective panels of the machine, which must be installed for reasons of safety and cleanliness, be designed as sliding doors.

In the area of the protective cover of a machine, the aim is to monitor two sliding doors that can be moved against each other with just one safety switch, to lock them and to keep them safely in a defined closed position using a suitable mechanism or to guarantee a defined forced closing and locking process for both sliding doors.

The following solutions are known so far:

In the paneling area around the immediate processing area of the machines, sliding doors are installed which, for safety reasons, are equipped with electrical or electronic safety devices which either automatically shut down the transfer line or the processing station if a door is opened without authorization, or hold the door securely until it can be unlocked and opened when the machine is in a safe state.

The doors used in such production or assembly lines are usually relatively complex in design, as they are intended to cover a large area and, on the other hand, to take up little space when opening so as not to hinder maintenance work.

For example, a combination of sliding and folding doors has been found. A folding door is attached to the first sliding door, which has a handle with a rod and locking mechanism as well as a lifting mechanism in the hinge. The locking of this door combination is monitored electronically.

The rear area of a processing unit is either covered with a plug-in panel or with a second sliding door that can be moved against the first sliding door.

The design in the form of a second sliding door was found to be, on the one hand, electrically unmonitored and, on the other hand, with quite complex components for securing the second sliding door.

The solution of a spring-operated bolt assembly was found in document DE 44 19 779.

In practice, the second door was also secured using a separate electrical or electronic security device.

With a swing door, it is not possible to completely prevent coolant from dripping when the door is open. In addition, the rods and the lifting mechanism are quite complex components.

The design in the form of removable plug-in plates is more complex for the operator and when the plug-in plates are removed, coolant can drip from the plates.

The variant of a second, unsecured sliding door is not perfect from a safety point of view, although behind this second door there are usually only movements with a low risk potential.

The bolt assembly for securing is a relatively complex assembly in terms of manufacture and assembly.

Securing the second door with a second switch is very expensive.

The invention has set itself the task of creating a device which achieves an effective means of securing this second sliding door, whereby a cost-effective implementation with low manufacturing and assembly costs is the main focus here.

The essence of the invention is that a pivotally mounted bolt is fixed between two sliding doors that can be moved relative to each other. An actuating cam is attached to one sliding door in such a way that when the doors are in the closed position, it swings the bolt into the sliding path of the second sliding door and thus prevents the second sliding door from opening. When the first sliding door is in the closed position with the actuating element, the bolt is swung out as an obstacle into the sliding path of the second sliding door.

If the first sliding door is opened from the locking area, the bolt releases the sliding path of the second sliding door. The first door can only be closed again if the second door is in the closed position, as in any other position it acts as an obstacle in front of the pivoting area of the safety bolt and thus prevents the first sliding door from closing.

The invention will be explained in more detail below using an embodiment.

The accompanying drawings show:

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Figure 1: Scheme of the device

Figure 2: Side view of the device diagram

Figure 3: Top view of the device with both doors closed

Figure 4: Top view of the device with the first door opened

Figure 5: Top view of the device with both doors open

A sliding door 1 is connected to a sliding door 2 in such a way that an actuating cam 3 is arranged on the sliding door 1 in such a way that, in the closed position of the first sliding door 1, it swings a safety latch 5 into the sliding path of the second sliding door 2 and thus prevents the opening of the second sliding door 2.

The safety latch 5 is rotatably mounted in a holder 4 which is attached between the sliding tracks of the two sliding doors 1;2 on the casing frame 6 of the machine.

The first sliding door 1 can be moved a few millimeters, which is still covered by an electrical safety lock 7; 8. Over this distance and a few millimeters more for safety, the actuating cam 3 causes the safety latch 5 to swing out into the sliding path of the second sliding door 2.

Only after the electrical safety switch 7; 8 has been unlocked can the first sliding door 1 be opened safely for the operator.

If the first sliding door 1 is safely opened from the switch and locking area, the safety latch 5 can release the sliding path of the second sliding door. The second sliding door 2 can now be opened.

If an attempt is now made to close and lock the first sliding door 1, the cam 3 on the first sliding door 1 is pressed against the safety latch 5. Since the second sliding door 2 is open in front of the safety latch 5, the safety latch 5 cannot swing out. The first sliding door 1 is mounted at the top and bottom in such a way that it cannot give in to the pressure of the relative movement between the actuating cam 3 and the safety latch 5. Therefore, the first sliding door 1 cannot be closed.

Only when the second sliding door 2 is properly closed can the safety latch 5 be pivoted by the actuating cam 3 of the first sliding door 1 into the sliding path of the second sliding door 2 and block it again.

Claims (7)

Protection claims: 1. Door safety device for two sliding doors that can be moved against each other on parallel sliding tracks, in particular sliding doors on processing units of transfer lines, special machines and stand-alone modules, characterized in that the first sliding door (1) controls a safety latch (5) by means of an actuating cam (3), which in the closed position of the first sliding door (1) extends into the sliding track of the second sliding door (2) and blocks it, and which in the open position of the first sliding door (1) releases the sliding track of the second sliding door (2). 2. Door security device according to item 1, characterized in that the sliding tracks of the two sliding doors (1; 2) are arranged parallel to one another at such a distance that the door security device can be freely mounted between them. 3. Door security device according to items 1 and 2, characterized in that the bearing (4) for a security bolt (5) is fixedly mounted between the sliding tracks. 4. Door security device according to items 1 and 3, characterized in that the safety latch (5) is straight in shape. 5. Door security device according to items 1 and 4, characterized in that the security bolt (5) is rotatably mounted and this axis of rotation is arranged parallel to the sliding tracks. 6. Door security device according to items 1 to 4, characterized in that the sliding door (1) carries an actuating cam (3) which acts on the security bolt (5). 7. Door security device according to item 1, characterized in that the second sliding door (2) is designed in such a way that it prevents the safety latch (5) from swinging out and thus the first sliding door (1) from closing when the second sliding door (2) is open.