FI94788C - Device for planning sand layers - Google Patents

Description

94788

DEVICE FOR LEVELING THE SAND LAYER

The invention relates to a device for leveling a layer of sand at the point of entry of various types of jumps, the device 5 comprising rails on each side of the sand layer and a backward sledge further comprising at least a rake member

As the race lasts, the surface of the descent will be depressed after the jumper has left and as a result of the gauges. This happens when the sand is wet, especially in rainy weather. Since jumper 15 meets the descent at an angle of about 45 °, each change in the level of the descent causes differences in the lengths of the jumps. If the depressed surface is added to the zero level from time to time by adding sand, it will suffer the most after lifting. Thus, in order to determine the correct length of the jump, it is absolutely essential that the surface of the landing site be at the same level during each jump throughout the race.

DE 2 448 830 discloses a sand layer leveling device comprising a rake member and a leveling member. The rake member consists of pins or flat members mounted in two transverse rows and extending deep into the sand layer. Such rows are pulled over the sand layer, in which case the sand layer should be thoroughly fluffed. These are followed by a leveling member formed by a transverse plate 30 which plows the mass over the surface to be leveled forward, leaving a flat surface. Finnish patent 76395 discloses a slightly modified sand layer leveling device which. likewise comprises sled-bound sand transfer and leveling means. The transfer member comprises a plow-like member which can be moved in the width direction to the assembly. The leveling member is hinged so that when it travels in the opposite direction it follows the uneven surface of the sand layer and only works when the carriage is moved in the leveling direction. Both of the above. the devices are mainly intended for manual operation, although 40 Finnish applications refer to possible mechanical use 94788 2. However, these are not particularly well suited for mechanical use, as the sled may rise up on uneven sand. In any case, the device according to the Finnish patent requires a visual assessment of the location of the assembly, at which point 5 the sand transfer member must be placed in the width direction.

The object of the present invention is to provide an easily mechanized and efficient and reliable sand layer leveling device. The characteristic features of the invention are set out in the appended claims.

According to the invention, a rake member is specifically used, although it requires a relatively large force. In mechanical use, this is not a disadvantage, but the rake members provide an efficient 15 loosening and sand fluff, with minimal compaction during the race.

In the following, the invention will be described with reference to the accompanying figures, which show a leveling device according to the invention.

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Figure 1 shows a front view of the leveling device.

Figure 2 shows a rear view of the leveling device.

Figure 3 shows a side view of the lifting means of the rakes and transfer members.

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In Figures 1 and 2, the sand layer is indicated by reference number 1, the rails by reference number 2 and the sled itself by reference number 3. The support wheels of the sled run inside the C-profile rail, so that it cannot rise even under heavy load. The first transfer member 5.1, consisting of several plow-like members, is in front of the device and the rake member 4 is behind the device. The plow-like · * members 5.1 are attached to a plate, the lower edge of which forms a leveling member 6. A rod 5.2, which forms a second transfer member, is attached to the rake members with chains 5.21. The spikes of the rake member 4 35 leave strong grooves on the surface, whereby the transfer member 5.2 acts as an effective pre-player. All actuators are electrically operated, for which purpose the carriage includes a spring coil 12 which pulls the cable taut and allows electricity to be supplied to the mobile carriage. The carriage includes a control unit 14 for controlling various functions as well as a drive motor 13 with a gearbox for moving the carriage.

5 The lifting of the rake member and the transfer member is performed by means of the parallelogram arms 7 and 9. These are driven by electric spindle motors 8 and 10. The spikes 4.1 and 4.2 of the rake member 4 are attached to a beam, which in turn is connected to the frame by means of parallelogram arms 7.1 and 7.2. The upper parallelogram arm is driven by said spindle motor 8.

10 A first transfer member 5.1 consisting of parallel V-plows is attached to the plate 6.1. The lower edge of this forms the actual leveling member 6. The V-plows themselves do not extend quite as low as the leveling member 6 at the tip.

15 The equalizer is used as follows. In Figure 1, both the rake member and the transfer member are at the bottom and the carriage is moved in the direction of the viewer. Figure 2 shows the situation seen from the other side. The rake member 4 and the second transfer member 5.2 are in operation. When leaving the home station, both are at the top, but counted down in an area of 20 sand layers. Once the sled reaches almost across the field, both are lifted up, however, the transfer member earlier. In the return phase, the leveling member is lowered to the set height and then driven over the entire field, whereby the sand layer is leveled. Near the rear station, the leveling link is lifted up and driven to 25 home stations.

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Claims (6)

Apparatus for leveling the sand layer (1) for the abutment of different jump branches, which comprises rails 5 (2) on both sides of the sand layer and including a forward and receding sledge (3), further comprising at least one rake member ( 4) for loosening up the sand, the moving means of the sand (5.1, 5.2) for filling out pits and a leveling means (6) for smoothing out the picked-up sand layer and means for moving them vertically, characterized by, that the displacement means for the sand consists of several parallel 1a V plows (5.1) directed in the opposite direction to the leveling direction and a transverse bar (5.2) opposite the rake member (4) or the like with its supporting means. 15 2. Device according to claim 1, characterized in that the leveling means (6) is formed by a vertical disk supporting the V-plows (5.1), the bottom of which slice smoothes the sand layer during the time of the jaw movement (3). 20 Device according to claim 1 or 2, characterized in that the bar (5.2) after the said ratchet member (4) is secured with chains (5.21) in the rake member (4). Device according to any one of claims 1 to 3, characterized in that the sled (3) comprises a mechanical drive device for its displacement, and a spring roller (12) for conducting the cable for transmitting the driving force to it. back and forth sledge. 30 Device according to any one of claims 1-4, characterized in that the said tools for moving the rake member (4) and the leveling means (6) vertically control for both guided parallel bars (7, 9) and actuating means (8, 10). ) For their use. Device according to any one of claims 1 to 5, characterized in that the rails are adapted to prevent the support wheels from rising even under hardened load.