DE1178755B - Method and device for stacking cigarettes or other stick-shaped objects - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY DEUTSCHES '/ WWWt PATENTAMT Internat. Class: A 24 c

EDITORIAL

German class: 79 b -13/01

Number:
File number:
Registration date:
Display day:

1178 755
A 36738 III / 79 b
17th February 1961
September 24, 1964

The invention relates to a method and a device for depositing the cigarette machine leaving cigarettes or other stick-shaped objects.

Devices for automatically depositing cigarettes in open-topped containers are in various Embodiments known. Some are difficult to differentiate in a simple manner Adapt to cigarette diameters, while others have the possibility that the cigarettes be damaged by the devices handling them. Still others could hardly get up easy way to adapt different high levels of the storage location.

In a known, another purpose, namely for the controlled delivery of cigarettes in the Chamber of a serial device with serial channels, serving device are the cigarettes from a storage hopper by means of a conveyor belt in a transverse axial position into the chamber of Sequencing device promoted. The movement of the conveyor belt is dependent on the amount of cigarettes controlled by means of a pivotably arranged stop in the chamber, which with a interacts switch lying in the circuit of the drive motor of the conveyor belt. To the orderly Storage of cigarettes or the like leaving the cigarette machine in exchangeable containers this device is not suitable.

An older proposal, like the subject matter of the invention, relates to a device used for cigarette making machines for stacking cigarettes, which are delivered one after the other on a conveyor belt and can be stacked in an exchangeable, longitudinally displaceable transport frame or container, one or more duct-shaped channels being used which feed the cigarettes to the container from the end of the conveyor belt. In this older proposal, a shaft-shaped channel, which consists of two telescoping downpipes, in which the cigarettes lie one above the other and are guided through the shaft walls at diametrically opposite points, engages in a container that receives the cigarettes in layers. The cigarettes are deposited individually from the downpipes into the reciprocating container, the lower movable downpipe being moved up one cigarette thickness after each full shift. The speed of the reciprocating movement of the container must be adapted to the height of fall of the cigarettes and may require a certain method and device for stacking
of cigarettes or other rod-shaped
Objects

Applicant:

American Machine & Foundry Company,

New York, N.Y. (V. St. A.)

Representative:

Dr.-Ing. K. Boehmert

and Dipl.-Ing. A. Boehmert, patent attorneys,

Bremen 1, Feldstr. 24

Named as inventor:
George Dearsley, London

Claimed priority:

Great Britain 17 February 1960 (5666)

Do not exceed the limit, as this would create gaps between the deposited cigarettes. This defines the throughput of the device. Another consequence of this older proposal can be seen in the fact that the place where the cigarettes are placed in the container must always be lower than that Feed point. However, this dimension is also limited because the downpipes are not arbitrarily long can make. When the cigarette depositing point in the container is at a higher level than the feeding point the cigarettes, this device is unusable, since there is no way to To first promote cigarettes from the feed point upwards.

The invention is intended to create a method and a device of the type specified at the beginning in which the cigarettes or the like. Independent of the plane in which they are fed can be placed in the container at any higher or lower level. Furthermore, any movement of the cigarettes with respect to their guide means should be forced by Detecting the individual cigarettes until they are placed in the container can be avoided with certainty.

Based on a method for stacking cigarettes or other stick-shaped objects in open-topped containers (trays), which during

409 688/38

the stacking stand still, the invention is characterized in that the approximately from the cigarette machine incoming cigarettes individually recorded held on one side of the jacket surface, conveyed further, deflected, moved approximately horizontally over the stacking surface and then released so that they fall onto the stacking surface. Here, the cigarettes or the like are used in a known manner parallel to each other and moved axially transversely. An essential process feature of the invention, which contributes to the increase in throughput can be seen in the fact that all of the approximately Cigarettes deflected horizontally are released at the same time, so that they fall off as a row. The cigarettes are expediently held in a known manner by means of suction.

This therefore ensures that each of the individually detected cigarettes during the entire Filing process is held immobile against the neighboring cigarettes and in an orderly sequence can be filed.

For practicing the method according to the invention, the invention of a device assumed the one feeding the cigarettes or other rod-shaped objects from the machine Conveyor belt and one taking over the cigarettes from the conveyor belt and into one during of the stack has stationary, open-topped container (trays) depositing stack conveyor.

According to the invention, such a device is characterized in that the stack conveyor as a revolving Suction conveyor is formed, the one or the cigarettes. Like. Above the stacking surface of the container hanging conveying section and on this section effective means for controlling or switching off the suction, so that after switching off the cigarettes or the like on the stacking surface Fall off freely in the container.

Further features and advantages of the invention can be found in the following description of exemplary embodiments with reference to the drawings. In the drawings shows

F i g. 1 is a front view of the automatic device according to the invention;

F i g. 2 shows a side view of the device for feeding empty containers into the filling position and for discharging them filled container from the filling position,

F i g. 3 is a sectional view taken along the line 3-3 in FIG. 1;

F i g. 4 is an enlarged view of a novel conveyor belt with molded grooves for receiving it of cigarettes,

Fig. 5 is a view of the removal device defective cigarettes at the beginning and at the end of an interruption in the cigarette production process,

F i g. 6 is a front view of an embodiment of the invention modified in such a way that the container filling can be done at any desired altitude,

F i g. 7 is a view of a drum used for deflecting in FIG. 1 in partial cut and

F i g. 8 is a front view of a further embodiment of the invention modified in such a way that the cigarettes are fed to the hopper of a cigarette packaging machine.

The invention relates to a method and a device for depositing a cigarette manufacturing machine leaving cigarettes in an open-topped container, which can be, for example, the loading receptacle of a cigarette packaging machine may, or it may be the containers in which cigarettes are stored when they are removed from the cigarette making machine to be delivered.

By way of illustration, the device according to the invention can be used with any type of this Shelves shown.

ίο In F i g. 1 the cigarettes become through the Collecting belt 10 delivered from the cigarette manufacturing machine or from the device, in which a filter mouthpiece is attached. The known feed conveyor belt 10 runs through an arrow indicated direction over the roller 12 and brings the cigarettes into contact with the endless perforated suction conveyor belt 14, which rotates in the direction of the arrow.

A suction chamber 16 is provided on those conveyor belt sections of the belt 14 through which the Cigarettes are transported through the belt 14, namely at 18, 20 and 22.

When the suction conveyor belt 14 runs around the drum 24, which is approximately in the manner shown in FIG. 7 is designed for a reversing drum type, the space between the two sections of the drum 24 is subjected to a negative pressure which is effective on the central perforated section of the suction conveyor belt. The negative pressure prevailing in the suction chamber 16 is generated by a negative pressure source which is connected to the line space 26 of the suction chamber 16. This negative pressure holds the cigarettes C firmly on the suction conveyor belt 14. After the cigarettes held in this way on the suction conveyor belt 14 have run around the drum 24, they move downwards. In order to save negative pressure, a conventional guide wall 28 can also be provided. In this case, the corresponding section of the belt 14 would be closed off from the vacuum source and the wall 28 would hold the cigarettes in their downward movement.

When the cigarettes C pass a button housing 30 arranged at this point during their transport around the roll 20, a button, for example a photocell, which measures the amount of light reflected from the end of the cigarette, determines whether the cigarette is damaged or not. If a damaged cigarette is found at this point, an ejector 32, which is connected to the button 30 and which has a control element, is actuated, and the damaged cigarette is automatically removed.

After their downward movement on the inclined surface of the suction conveyor belt 14, the cigarettes pass a tail pulley 34, which according to FIG. 7 consists of two sections.

When the cigarettes are transported around the drum 34, they are caused by the negative pressure in the suction chamber 36 held, which is also in the space 38 between the two sections of the drum 34 on Volume 14 is effective. If the belt 14 continues its horizontal run, the cigarettes will continue held by the negative pressure in the suction chamber 36 on the suction conveyor.

An adjustable wall 40 separates the two sections of drum 34 as shown in FIGS F i g. 1 and 7, the suction chamber 16 is separated from the suction chamber 36. When the first cigarette 44 all the horizontal way at the bottom

has passed through the suction chamber 36, it reaches a sensing device 42. As soon as this first cigarette acts on the sensing device, the flap 46 is actuated, which the suction chamber 36 of the line space 26 and thus separates from the vacuum source. When this happens, the cigarettes will released from the suction conveyor 14 and discharged into the receptacle 48. It can be seen that they Fall just a short way and stab to the ground

are attached to straps or chains 68 and 70.

A driver actuates a container changing device (see FIG. 2) when a container after repeated execution of the process just described is filled. To illustrate, it is shown that this driver mechanism consists of a cam 88 attached to the support members consists. Instead of running around with the belt 70, you can

of the container 48 or on the top row of the be ίο the cams 88 but also on one of the shafts, Place the cigarettes already in the container. for example on the shaft carrying the roller 78

The wall 40 is adjustable on the circumference. By this setting automatically determines the number of cigarettes emptied into the container.

90, be attached.

By giving the roller 78 a circumference which corresponds to the path the container takes in one go

A similar wall 50 is to be lowered between the two 15 zen filling operations, one can do it Sections of the drum 52 arranged to use the attached, not shown cam Completion of the suction chamber 36.

The flap 46 is attached to a shaft 54 which is actuated by a magnet 60 via levers 56 and 58 will. The actuation of the magnet 60 takes place automatically when the button 42 is on the first Cigarette 44 responds, which is brought up on the lower horizontal portion of the suction conveyor 14 will.

In order to move rapidly downwards when the vacuum is shut off by 25 members 84 and 86, the closing of the flap 46 causes a mess of the container to be quickly lowered and a new pair of the cigarettes just passing through the drum 34
to prevent rods 62 are provided which the
Cigarettes in a parallel arrangement when falling
keep.

As soon as the cigarette 44 falls out of the range of the button 42, the magnet 60 is released, and the spring 63 opens by ejecting the piston 64

in order to act on a sensor or switch which has the functions shown in FIG. 2 shown container changing device actuated.

In the FIG. 1 and 2 illustrated embodiment the cam 88 acts on the switch 92; in Fig. 1 this process has just been completed.

If the switch 92 'is actuated, the carrying straps attached to the straps or chains 68 and 70 are

of free support members 84 and 86 in the correct position for receiving the empty exchange container brought. Then the ratchets 94 and 96 are operated, and those with the corresponding Containers engaged ratchet levers 98 and 100 push them on the rails 102 and 104 and convey the

Container 106 is gradually lowered in the manner described above as it is filled with cigarettes.

Appropriate movement of the belts or chains 68 and 70 pushes the filled 'container onto the Rails 102 continue with the sliding mechanism either attached to the shaft 90 by one Cams and a microswitch or by a

the flap 46. foremost container 106 onto the support members 84

When the cigarettes from the suction conveyor 14 35 and 86. ■

solve, they fall down and either on the resting on the support members 84 and 86 new

Bottom of the container 48, as shown in FIG. 1 shown or on the last layer of the cigarettes already fed into the container. If the latter happens, the button 66 responds to the stacked cigarettes and actuates a container lowering device, which moves the belts or chains 68 and 70 down until the button 66 is again is uncovered.

The in Fig. The container 48 shown in FIG. 1 and the chains 45 are actuated by the device driven by the shaft 90 68 and 70 can also be omitted, and will, so that it corresponds in time

with the shaft 90 and thus with the ones on the support members 84 and 86 held containers moved. The filled container is held by the lever rods 94 attached ratchet levers 98 pushed further on the rails 102 and thus makes the currently in the container located in the filling and lowering position.

It can be seen that the lever rod 94 pulls

16 and 36 act on the cigarette C and all of them on the 55 at the same time as the last filled container Hold the suction conveyor 14. pushes the previously filled container further so that the

In order to avoid being forced to move everybody with the space between the operating staff Belts of the suction conveyor 14 are connected to remove the filled container immediately, but the Beden To be able to regulate negative pressure, two holders can accumulate first, and then Adjustment plates 72 and 74 at a distance from one another 60 possibly to be removed as a group. To this provided, with which the size of the distance a way can the device for a proportioned can be. run for a moderate period of time without supervision.

The belts or chains 68 and 70 run over. In Fig. 4 is another embodiment of the

Rolls 76 and 78 and 80 and 82. Rolls 80 of tape 14 are shown. In this illustration, the tape is and 82 are synchronously coupled and are connected by a 65 in a known manner with sucking grooves or support channels shared drive. The od for the cigarettes. Like. Provided, however, in the Containers held by support members 84 and 86 in contrast to the usual suction grooves' by elongated; automatically lowered. The support members 84 and 86 juxtaposed portions 10 of, triangular

the cigarettes can from the suction conveyor 14 directly into the collecting station of a cigarette packaging machine fall. This results in a device of the type shown in FIG. 8 shown art.

The suction conveyor 14 consists of two parallel spaced belts, as shown in FIG. 3 is shown. By dividing the suction conveyor belt 14, the negative pressure in the suction chambers

Cross-section are formed. Between the triangular parts there are slots 110, which with are in communication with the suction chamber. Because the sides of the triangular parts are better straight than curved are, the support channels formed by the sides of two adjacent triangular parts can be round Carry cigarettes of different diameters or oval cigarettes, as only line contact takes place.

lowered by means of belts or chains 130 and 132 in the usual way until the respective container is filled. This is then removed and a new container is placed on the support members 126 and 128.

The in F i g. 6 and chains 130 and 132 can also be omitted, and the cigarettes can from the horizontal section 124 of the belt 120 directly into the collecting space a cigarette packing machine in the

Another advantage of this particular design is the same or fall on a different level.

The shape of the suction grooves is that more surface area of the cigarette in connection with the suction chamber and that for this reason the cigarette is easier to fix on the conveyor belt by means of negative pressure.

This embodiment of the invention is shown in FIG. 8 shown. The arrangement shown therein has one or more infeed conveyor belts 140 that run over rollers 142 and take the cigarettes from

can be held. Also, enough air 15 can pass through one or more cigarette making the endings flow in, so that the zigzag machines of the usual design approach. The general

Cigarettes labeled with the letter C are thus conveyed into the active area of a suction conveyor belt 144, which is expediently carried out by the in

Cigarettes are transported downward by the suction conveyor 144 to its horizontal section 156.

As previously in connection with FIG. 1, the arrival of the first cigarette acts on the Drum 154 on a device that draws the negative pressure from the lower or horizontal section 156 of the suction conveyor 144 shut off. With that, the

save when shutting off the negative pressure drop.

In Fig. 5 shows a modified embodiment of the invention that eliminates defective

Cigarettes are permitted before they are referred to as 14 in FIGS. 1, 3 and 4 to the suction conveyor 14. Of the

be guided. This device is attached to the roller suction conveyor 144 running over drums 146, 148 and

shaft 112 attached to the roller 12 and consists of a 150. The suction chambers 26 and 36 as well as the

Guide plate 116 and a supporting shaft 54 holding it, attached flap 46 and lever 56 ar-

poor 114. work in the same way as related

When switching off the cigarette production as with F i g. 1 described. The drums 152 and 154 machine will also do the cigarette feeding work corresponding to the drums 52 and 34. The conveyor belt 13 stopped, and the guide plate
116 is moved by gravity into the position shown in FIG. 5 position 118 shown in dashed lines moves. As a result, when the cigarette manufacturing machine 30
the first cigarettes are thrown off or rejected by the suction conveyor 14. For the purpose of a more reliable function, springs can be provided
which moves the guide plate 116 into position 118
urge, from which it is lifted by the pull of the suction conveyor 35 entire row of cigarettes held on the suction conveyor 144 between belt 14 against a stop, not shown, the drums 152 and 154 on the support arm 114. It will fall off. It goes without saying that for the purpose of this, the guide plate 116 automatically moves into its position in FIG. 5 the dispensing of the cigarettes instead of a shut-off device shown in solid lines moves the device for the negative pressure also a stripping device and the cigarettes can thus be used for the suction conveyor 14 device. In this out, who picks them up and transports them into the above-described embodiment of the device, the collecting level can be transported to the delivery position. loading the hopper of a cigarette packaging machine

If the operation of the cigarette making known construction at a distance immediately

machine is interrupted, the guide will be placed under section 156 so that the

Plate 116 moved to its lower position so that the 45 cigarettes fall into it. Such a collective

cigarette funnel 158 last manufactured before the interruption is provided with shaking devices 159 and

save to be thrown off at this point. 160 provided. Instead of a collecting funnel can also

F i g. 6 shows a further embodiment. This is a conveyor belt of the packaging machine under the

Modification is particularly advantageous where the horizontal section of the suction conveyor 144 is located.

Space between the infeed conveyor belt 118 and the 50 must be arranged to accommodate the dispensed cigarettes.

Occupy the bottom of the cigarette making machine.

is restricted. In this case the cigarettes It is evident that this embodiment

can be modified from the conveyor belt 118 running over rollers that of the invention

Effective range of the suction conveyor belt 120 in a can that the shut-off of the negative pressure

horizontal plane and fed by the suction 55 at any point of the horizontal section 156

conveyor, which takes place in its execution in that of the suction conveyor 144, since it is not necessarily

F i g. 1, 3 and 4 is similar to the suction conveyor 14 shown, initially transported upwards. The cigarettes The load-bearing suction conveyor runs around drums 122 which are similar to rollers 24 in construction could be.

The cigarettes are then conveyed to the horizontal section 124 in a manner similar to that it in connection with F i g. 1 has been described

It is necessary that the cigarettes in superimposed, horizontal rows in the collecting space to be emptied.

It is also noteworthy that the floor levels in which the cigarette making machine and the Cigarette packaging machine are arranged, either the same or different, wherein either the former or the latter is above the

is. The empty containers are also located in the other 65. This advantage is possible described way the support members 126 and light that the cigarettes both in horizontal as 128 supplied. You will then be followed by one in connection with FIG. 1 described mechanism

be held firmly to the belt even during vertical transport.

Because cigarette packaging machines sometimes have a capacity that of a cigarette making machine exceeds, within the scope of the invention, arrangements of the type shown in FIG. 8 provided, however, in which two or more cigarette making machines feed the collecting hopper 158, wherein in the described arrangement a suction conveyor belt and a vacuum shut-off device at least one more feed belt is added.

The cigarette making machine can be at any distance from the cigarette packing machine be arranged. It is with the device for receiving and transporting cigarettes possible, cigarettes from a set up for example in a floor or a building of the factory Cigarette making machine to that on a different floor or even in a different building to transport the erected cigarette packaging machine. Nothing more is necessary than to manufacture the device in the appropriate size. It is extremely important that the transport shown is completely automatic and there is no manual handling of the cigarettes requirement.

A person skilled in the art will understand that other means besides negative pressure are also used can be to keep the cigarettes on the conveyor belt, which was previously called a suction conveyor belt was designated. It is also evident that instead of a conveyor belt as a means of transporting cigarettes For example, a conveyor device provided with mk grooves or support grooves for same purpose can be used.

The above description relates to a device in which the transport and storage of the cigarettes in the container used suction conveyor belt in a certain position along a substantially triangular path and in which the receiving container is relative to of the fixed conveyor belt assembly between the top surface of those already fed into the container Cigarettes and the belt surface are moved.

Depending on the type of containers being filled, this method is satisfactory, but it is it goes without saying that just as satisfactory results can be obtained if those to be filled Container remain in the rest position and the suction conveyor belt is moved so that the desired relative position between the upper layer of the cigarettes already fed to the container and the belt surface is preserved.

This second method can be preferred if you want to fill containers that are only on top are open, since it has been found that it is easier to move the stacking conveyor belt in the mentioned, already proposed type to lower the container than to raise the container.

Furthermore, as described above, the cigarettes are discharged below to the same extent as they arrive at the top. A variation is that they are discharged a little faster than they arrive. The effect of this is that gaps in the endless stream of the suction conveyor belt worn cigarettes arise; but it has been shown in practice that this has no effect on the Has efficiency of feeding cigarettes to the containers.

The advantage of this somewhat faster discharge is that after a brief interruption of the Feed when, for example, some cigarettes are taken out for inspection purposes, the temporary excess is removed after a short time when the cigarettes are reintroduced.

It is also understood from the above description that the transition from a full tank to an empty spare tank during the period of time that the Suction conveyor belt needed to traverse the length of the container. This can happen with the normally used container size can be accomplished satisfactorily, but it is known that in some Parts of the world use much smaller containers. The use of the smallest this container reduces the length of the container required by the take-up belt and thus the time available to replace the full container with an empty one considerably.

Under these circumstances, by interrupting the suction conveyor belt movement, more time is required to change the container to provide. The cigarettes become the feed point of the suction conveyor further fed, which in this case acts as an alternatingly filled reservoir. Dear store is emptied afterwards because the suction conveyor belt removes the cigarettes from the store faster, when they are then fed to this.

Claims (15)

Patent claims: 1. Method of stacking cigarettes or other stick-shaped objects in the above open containers (trays) which stand still during stacking, characterized in that, that the cigarettes arriving from the cigarette machine are detected individually, held on one side of the lateral surface, conveyed further, deflected, moved approximately horizontally over the stacking surface and then are released so that they fall onto the stacking surface. 2. The method according to claim 1, characterized in that the cigarettes od. Like. In known Way parallel to each other and axially moved transversely. * 3. The method according to claim 1 or 2, characterized in that all of the approximately into the Horizontal deflected cigarettes are released at the same time so that they fall off as a row, 4. The method according to claims 1 to 3, characterized in that the holding of the Cigarettes are made in a known manner by suction. 5. Device for practicing the method according to claims 1 or the following, with feeding the cigarettes or other stick-shaped objects from the machine Conveyor belt, one taking over the cigarettes from the conveyor belt and one during the Stapein's stationary, open-topped stacking conveyor depositing containers (trays), thereby characterized in that the stack conveyor (14; 120: 144) is designed as a rotating suction conveyor is, the one the cigarettes (C) or the like. About the '. . · 409 688/38 Stacking surface of the container (48; 106; 158) has a hanging conveying section (124; 156) and from this section effective means (42, 60, 46) for controlling or switching off the suction effect, so that after switching off the cigarettes or the like. fall freely onto the stacking surface in the container. 6. Apparatus according to claim 5, characterized in that the suction conveyor has a conveyor belt (14; 120; 144) with transverse, in cross-section approximately triangular strips (108) which between them in a known manner suction grooves or support channels for receiving the rod-shaped Form objects, with openings (110) in the bottom of the support troughs communicating with the negative pressure space (36) in order to hold the objects in the support troughs. 7. Device according to claims 5 and 6, characterized in that the means (42, 60, 46) for regulating the negative pressure, such as a sensing device for controlling a suction air flap, are actuated by the rod-shaped objects (C) themselves when this one have taken a suitable position to put them down. 8. Device according to one of claims 5 to 7, characterized in that the container (48; 106: 158) receiving known lowering device (68, 70, 84, 86; 130, 132, 126, 128) is provided which The relative position of the container to the suspended conveying section (124; 156) of the suction conveyor (14; 120; 144) is controlled by means of a sensing device (66) in such a way that the container is gradually lowered in a known manner by one layer height at a time. 9. Device according to one of claims 5 to 8, characterized in that the lowering device (68, 70, 84, 86; 130, 132, 126, 128) with a feed device arranged in an upper position (96, 100) for empty containers (48; 106) cooperates from a store and an ejector arranged in a lower position for full containers. 10. Device according to one of claims 5 to 7, characterized in that a sensing device (66) is provided which controls an actuating device for moving the suction conveyor (14; 120) relative to the container (48, 106) . 11. Device according to one of claims 5 to 7, characterized in that a responsive to the objects last deposited sensing device (66) is provided, the one both the suction conveyor (14; 120) and the container (48, 106) so moving Actuating device controls that the desired distance is maintained between the conveyor and the upper surface of the last deposited rod-shaped objects. 12. Device according to one of claims 5 to 11, characterized in that the drive of the suction conveyor (14; 120; 144) is designed so that it removes the rod-shaped objects faster than they arrive at the suction conveyor. 13. Device according to claims 5 to 12, characterized in that a switch (92) is provided which automatically stops the movement of the suction conveyor (14; 120; 144) when a filled container (48; 106) against an empty container is exchanged, and which automatically restarts the movement when the empty container is in its filling position. 14. Device according to one of claims 5 to 13, characterized in that a sensing device (30) is provided for checking the ends of the rod-shaped objects (C) when they are moved along the suction conveyor (14; 120; 144) ; and that this sensing device actuates an ejector (32) which ejects the objects recognized as defective. 15. Apparatus according to claim 14, characterized in that the ejector has a guide plate ( 116) arranged at the delivery end of the feed conveyor belt (13) for the suction conveyor and a mechanism for moving this guide plate between a position in which the objects are attached to the suction conveyor (14; 120; 144) , and in a position in which the objects are removed from the suction conveyor, and that means are provided for actuating the guide plate in such a way that the objects located at the beginning or at the end of each continuous work run are ejected. Documents considered: Austrian patent specification No. 174 577. Older patents considered: German Patent No. 1 103 214. For this purpose 2 sheets of drawings 409 688/38 9.64 @ Bundesdruckerei Berlin