FI57242C - CONSTRUCTION OF CONSTRUCTION HOUSING FOR TRUCKS LASTUPPBAERANDE KONSTRUKTION - Google Patents

Description

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Patani och rasiataratyralaan 'Antekan utiagd och utUki-Ktan pubitcand 31.03.00 (32) (33) (31) Pjrydttty «tuelktu # —Begird priority (71) Kone Osakeyhtiö, Munkkiniemen Puistotie 25, 00330 Helsinki 33, Finland-Finland (Fl) (72) Paavo Kotilainen, Espoo, Suomi-Finland (FI) (7 * 0 Oy Heinänen Ab (5 * 0 Height determining device for the load-bearing structure of a truck -Anordning för bestämning av hojdläget för en trucks lastuppbärande konstruktion The present invention relates to a truck load-bearing structure a device for determining the height position of a structure, e.g. a fork, with a stepwise selection.

Known devices for measuring the height position of a load-bearing structure of a truck compare the height with the truck body. The height position of the truck body depends on the height position of the truck chassis at each truck operating position. Since the purpose of the measurement is to position the load-bearing structure, for example the fork, exactly to the correct height in relation to the selected rack level, the difference in height between it and the truck's chassis, ie the floor, must be exactly correct over the entire operating range of the truck. It requires a very high-precision flat floor surface in all shelving corridors, as well as high-precision installed shelf levels compared to this floor level. Local depressions in the shelf aisles or in the basic structure of the shelf due to aging, etc. due to obsolescence, etc., cause errors in the height measurement and, as a result, malfunctions in the truck.

With the known altitude measuring devices used in trucks, 2 57242, the altitude position can be selected stepwise so that all the altitude positions to be selected are fixed. When using such height measuring devices, all rack levels in the truck's operating range must correspond to these fixed height values. For this reason, the efficient use of such a truck with a height measuring device is limited to a certain storage area.

The object of the present invention is to solve the above-mentioned problem. The device according to the invention is characterized in that the device comprises sensors which measure the height position to a basic height independent of the truck, for example optically perceptible signs on the shelves, and

In the device according to the invention, the height determination is based on an individual base height sensor or a mark attached to the shelf at each shelf location or a vertical row thereof, against which the height determination is performed. In addition, sensors or markers are attached to the shelf to indicate the height of the shelf levels at or within the shelf passage portion of each such mark. By means of the device according to the invention, it is thus possible to determine exactly the correct shelf level in each operating position of the truck, even if the shelf levels are different at different points in the warehouse or storage corridor.

A preferred embodiment of the invention is characterized in that a pair of sensors measuring the height position are attached to a control motor (13) which makes a vertical adjustment movement. Thus, the pair of sensors, which is the starting point for the measurement, is reset from the marks on the shelves.

Another embodiment of the invention is characterized in that the sensors are photocells.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which

Fig. 1 shows a shelf in which the shelf levels are at different heights.

«3 57242

Fig. 2 shows the same shelf but seen from above.

Fig. 3 shows a shelf space with a forklift equipped with a device according to the invention.

Fig. 4 shows a diagram of the operating principle of the device according to the invention.

Fig. 5 shows a shelf spacing with optically readable indicia.

Fig. 6 shows in more detail the operation of the device for measuring the height difference.

The shelf level heights of shelf 1 may be different on opposite sides of the shelf corridor and different on different shelf corridors. In addition, there may be more than two different shelf height distributions along the same shelving corridor. The optically readable marks 2,3 shown in Fig. 5 are placed on the shelf, which are read by the devices in the truck 4 according to Fig. 3 as the truck moves in the shelf corridor.

The device 5 shown in Fig. 4 reads the characters 3 indicating the height distribution of the shelves placed on the shelf 1. The device 6 interprets the read characters 3 and converts them for the device 7 into information corresponding to the height distribution of the shelf levels. The device 8 uses the height markers 2 to determine, for each vertical row of shelf positions, the basic height against which the height measurement for the different shelf levels is performed. The device 9 receives the information needed to detect the height difference from both the device 8 and the load-bearing structure 10 of the truck 4. This height difference information provided by the device 9 is given to the device 7. The target shelf level . The device 7 compares this selection information with the information received from the devices 9 and 6 and causes the hoisting system to run so that the height position of the load-bearing structure 10 becomes correct.

Figure 6 shows in more detail the operation of a device 9 for measuring the height difference. The photocells 11 and 12 of the device 8 capable of detecting the height position of the optical marker 2 attached to the truck move in the vertical direction when driven by the motor 13. The motor control devices 14 and 15 drive the motor 13 in such a way that neither of the photocells * 1 or 12 can be detected by the altitude mark 2. 1 4 57242

The motor 13 rotate the vertical difference detecting device 9 while visiting the inner periphery 16 such that it rotates in the direction 17 or 18 is transferred by the photocell pairs 11 and 12, the arrow 17 or 18 in the direction.

9, the outer periphery of the device rotates as indicated by arrow 20 in the direction of the height difference between the load-bearing structure of the truck d increases relative to the truck frame. A pair of contacts or a similar coupling device placed on the perimeters of the device 9 operate opposite each other at 21. In this position 21 the height difference d between the height mark 2 attached to the shelf 1 and the load-bearing structure 20 is precisely determined and independent of the height difference between the truck body 4 and the height mark 2. .

It will be apparent to those skilled in the art that various embodiments of the invention may vary within the scope of the claims set forth below. Thus, optical sensors can be replaced by mechanical sensors.

Claims (3)

57242 A device for determining the height of a truck's load-bearing structure, e.g. a fork, with a step-by-step selection, characterized in that the device comprises sensors (11,12) which measure the height to a truck-independent base height, e.g. optically perceptible on shelves (1) 2) and that the device comprises sensors (5) which, when driving into the shelf-aisle, read, for example, optically placed signs (3) on the shelf (1) indicating the height distribution of the shelves · Device according to Claim 1, characterized in that a pair of sensors (11, 12) which measure the height position are fastened to a control motor (13) which makes a vertical adjustment movement. Device according to Claim 1 or 2, characterized in that the sensors (5, 11, 12) are photocells.