Transporting apparatus

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PATENTS AND REGISTRATION OFFICE

PUBLICATION PAPER m- 356 495 intci B 66 f 9/06

Patent Application. No. 14901/70 Received on 5 XI 197 ° Validity Day on 5 XI 1970

Ans. generally available on 7 V 1971

Ans. laid out and the pamphlet published 28 V 1973

Priority requested from 6 XI 1969 (Federal Republic of Germany DT, 15-55. 83-7)

ROBERT BOSCH GMBH, STUTTGART, UNITED STATES GERMANY DT Inventor G Schnell, Stuttgart Agents »PU Brain

Forklift with steering gear ^r The present invention relates to a forklift truck according to the preamble of the attached claim 1

With known, automatically controlled forklifts, it is not possible to reach exactly under loads intended for transport, e.g. pallets, by backing in a take-off path which deviates from a straight line, since no precise control is possible with the pivotable drive roller, which, when backing, is behind the fixed running rollers.

The invention therefore relates to a forklift truck, which can also be accurately controlled during reversing. According to the invention, this is achieved by having the fork carriage initially shown having the features set forth in claim 1.

The invention is described in more detail below by way of example with reference to the accompanying drawing, in which Fig. 1 shows a road network for forklift trucks, Fig. 2 a fork lift truck with lowered lift fork, Fig. 3 the fork truck with raised lift fork and Fig. * + The fork truck seen from the top with schematically indicated control mechanism. .

In Fig. 1, fork carriages 11 follow a guide 10 in the direction indicated by arrows. Alongside the leader are storage locations, e.g. a shelf 12, for the cargo intended for transport, which

in the present case, pallets are lying. With the help of the forklifts 11, the pallets will be unloaded or unloaded at certain points in front of the shelves 11, e.g. at A, for the purpose of e.g. In order to load the pallet 13 at point A, an unloaded fork carriage 11 in the forward direction must initially be advanced to the point B and then in the reverse direction to the point A along a guide conductor 14, which forms a withdrawal path. By rolling under the pallet 13 with the fork 15 on the fork carriage 11 and by lifting the fork 15, the load is loaded here and the fork carriage 11 can now leave the take-off track again in the forward direction and move along the guide 10.

The structure of the forklift truck is shown in Figures 2 - 4. At the lifting frame 16, the lifting fork 15 is fixed, which according to Figure 2 can be lowered, so that the fork ends 17 and 18 can be inserted under the pallet 13. After the fork ends 17 and 18 are inserted under the pallet, the lifting fork is lifted 15 together with the load. At fork ends 17 and 18, running rollers 19 and 20 are mounted, which are stored on a pivotable arm 21 and which when lifted lift fork 15 roll on the roadway, while at lowered lift fork 15 are &lt;$ lift from this path. The pivotal movement of the arm 21 is controlled together with the movement of the fork 15 by means of the lifting mechanism not shown on the fork carriage 11. As seen in the travel direction, a lifting roller 22 is arranged in front of the lifting device 16, which is driven by a drive motor 23. The drive motor can e.g. be an electric motor or an internal combustion engine. The drive roller 22 is pivotally mounted and can be pivoted by a steering motor 24 and therefore serves to control the vehicle. In the vicinity of the driving roller there is a first sensing coil 25 and on a protective bracket 26 arranged in front of the driving roller a second sensing coil for sensing the magnetic field formed around the alternating current supplied in the pathway. The voltages induced in the coils 25 and 27 are processed by a control device arranged in the lifting frame 16 of the fork carriage, so that pulses are generated for the right or left rotation of the control motor 24. Between the fork ends 17 and 18 there is an additional sensing coil 39 for the magnetic field along the guide 10, which, however, is only connected to the control device, when the auxiliary link rollers 30 and 31 roll on the roadway, so that the control is carried out by these auxiliary control rollers 30 and 31 · The sensing coil 39 is conveniently attached to a support bar 38 which is connected to a pivot pin 36.

The auxiliary link rollers are mounted on the fork carriage 11 by means of a carrier 28 connected to the lifting fork 15, with pins 29 rotatably mounted on the carrier 28, to which the auxiliary guide rollers 30 and 31 are pivotally attached. The turning pins of the auxiliary link rollers are firmly connected to guide arms 32 and 33, which in turn are movably connected to a cross bar 34. On the transverse rod 34, a guide rod 35 is rotatably arranged3, which is connected to the pivot pin 36 of a disk 37, the disk 37 being rotatable by means of the control motor 2 * t. By means of this control clutch it is possible to displace the auxiliary link rollers 31 and 30 in accordance with the rotary movement of the control motor 24. At the same time, the sensing coil 39 is also displaced on the carrier rod 38 and is thus passed almost over the guide conductor 10.

Another possibility of controlling the fork carriage consists in the fact that for the auxiliary control rollers and the drive roller each a steering motor is reported, whereby the control device, when traveling forward, is connected to the steering roller controls and when traveling backwards with the steering motor for the auxiliary control rollers.

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