FI78757B - DRAGMEKANISM VID EN UTBREDARE FOER MATERIALSTRAENG. - Google Patents

Description

78757

ROUGH SPREADER DRIVE MECHANISM - DRAGMEKANISM VID EN UT-BREDARE FÖR MATERIALSTRÄNG

The present invention relates to a traction mechanism for a roughing spreader, comprising a mounting platform for attachment to a traction machine, such as a grader, and traction members connected to the mounting plane and connected at one end to the body of the roughing machine.

Rough spreaders have been built for a long time. They are used after the graders to level the material removed by the planer from the gravel road surface. The material spreads from the left side of the planer blade into a so-called rough, or elongate, clump. A rake spreader attached to the rear of the grader spreads the roughage back evenly to the road surface. The same effect can, of course, be achieved without a roughener by driving the same route again on the grader, whereby the planer blade acts as a roughener. However, this is time consuming.

The roughener includes a so-called attachment level, from which it is attached to the rear of the grader. Today, three arms, i.e. the upper arm and two drawbars, are usually attached to the mounting plane, which are attached at one end to the body of the roughener. The arms are fixed laterally so that the plowing angle of the coarse spreader blade cannot be adjusted. The usual plowing angle is 30 ° to the transverse direction of the road, which in current rougheners remains in all conditions. In practice, however, there are often situations where adjustment, even rapid, would be necessary. Such situations include e.g. awkward points of curvature, hump, and plunge.

U.S. Pat. No. 3,049,822 discloses a grader followed by a blade specifically used for leveling road benches, 2 78757, which, however, can also be turned to a position (Fig. 3) to act as a roughener. The weakness of this roughener is also that the plowing angle of the blade cannot be adjusted from the cab.

It is an object of the present invention to provide a new traction mechanism for a roughing spreader which does not have the disadvantages of known traction mechanisms. The traction mechanism according to the invention is characterized in that one of the traction members is an articulated drawbar which rotates substantially freely with respect to the mounting plane and that the other two traction members are power devices for adjusting the position of the roughener.

A preferred embodiment of the invention is characterized in that the end of the drawbar is provided with an articulation ball arranged in a corresponding housing in the mounting plane.

Another preferred embodiment of the invention is characterized in that the power devices are hydraulic cylinders, one of which is the rake angle adjusting cylinder of the roughing spreader and the other the lifting cylinder of the roughing spreader.

Another preferred embodiment of the invention is characterized in that a tilt limiter is arranged between the mounting plane and the drawbar.

The invention provides considerable advantages over known rough spreaders. The plowing angle of the rough spreader blade can be adjusted hydraulically directly from the cab of the grader, as well as the roughing spreader can be raised to the transfer position from the cab. The adjustment of the plowing angle is particularly important for the working width of the roughing spreader and for the curve and hump behavior.

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In the following, the invention will be explained in detail by means of preferred exemplary embodiments with reference to the accompanying drawings, in which

Fig. 1 is a schematic side view of a grader with a known rough spreader attached.

Fig. 2 is a schematic top view of a part of a roughener according to the invention.

Fig. 3 is a perspective view of the traction mechanism of a roughener according to the invention.

Fig. 4 shows a perspective view of a detail of a traction mechanism according to the invention.

Figure 1 shows a typical grader 1 with a planer blade 2. The planer blade 2 removes material from the road surface which, as the grader moves forward, forms a continuous rough on the left side of the planer blade. The planer blade 2 is slightly wider than the planer track so that the rear wheels of the grader run in the planed area. Attached to the rear of the grader 1 is a roughener 3 which is wider than the planer blade 2, so that the roughener strikes a roughener which is at a certain angle (usually about 30 °) to the transverse direction of the road. There is a small gap between the blade spreader blade 4 and the road surface 5, from which the rough is evenly spread back to the road.

Figure 2 shows a roughing spreader 3 according to the invention. The roughing spreader comprises a body 6 to which a blade 4 is attached. The spreader further includes freely rotating and pivoting wheels 7. The number or location of the wheels is not essential to the present invention, but the invention is applicable to all known rough spreaders.

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The traction mechanism according to the invention comprises a fastening level 8 by means of which the roughener is fastened behind the grader 1. The fastening can be carried out, for example, with a semi-quick fastening (with two fastening screws and fastening irons, one of which is shown by reference numeral 9). With this fastening method, the fastening is made fast and backlash-free. It should be noted, however, that the attachment plane can be attached to the grader in any other conceivable manner.

A portion 10 is provided in the mounting plane 8 for receiving the articulation ball 12 of the drawbar 11. The drawbar can then pivot freely relative to the mounting plane 8, albeit with a small restriction, which will be returned to below. The other end of the drawbar 11 is rigidly attached to the roughing spreader body 6. In addition, two hydraulic cylinders 13, 14 are pivotally articulated to the horizontal axis, the piston rods of which are pivotally articulated to the roughing spreader body 6 at opposite ends. allows the hydraulic cylinders to rotate horizontally by approx. 30 °.

The hydraulic cylinder 13 operates to adjust the plowing angle of the roughing spreader 3. It is conceivable that the normal position of the blade spreader blade 4 is about 30 ° with respect to the transverse direction of the road. In this embodiment, the plowing angle can be adjusted by + 15 ° by means of the hydraulic cylinder 13. The center of rotation of the plowing angle is the drawbar 12. The adjustment is done hydraulically from the cab. The hydraulic cylinder 13, i.e. the plowing angle adjustment cylinder, is further provided with a pressure relief valve (not shown in the figures), which protects the device in the event of an obstacle. The plowing angle adjustment cylinder 13 is substantially horizontal, as shown in Fig. 3.

The hydraulic cylinder 14 acts to lift the roughing spreader off the road surface, for example during transport. This 5 78757 cylinder is also controlled from the grader cab. In order to be able to lift, the end of the lifting cylinder 14 on the mounting plane side must be higher than the opposite end connected to the body of the roughener. As well as the adjustment of the plowing angle, the drawbar 12 of the drawbar 11 also serves as the turning center of the lifting movement.

Fig. 2, and in particular Fig. 4, shows the tilt limiter mechanism 15, 16, 17, 18 of the roughing spreader. The purpose of the mechanism is to dampen lateral oscillations during roughing and to keep the roughing spreader in the correct position during transport. Without the limiter, the coarse spreader would recklessly tilt off the ground due to its special traction mechanism structure. The tilt limiter mechanism comprises a substantially vertical rod 15 arranged in the mounting plane 8, the lower end 18 of which is provided with a hole. A pin 16 attached to the drawbar is arranged through the hole. There is a pivot bearing between the hole and the pin, so that there is no clearance between these parts. At the end of the pin 16 on the other side of the hole is a nut 17 which holds the articulated coil in place and also prevents excessive lateral oscillations. At the upper end of the vertical bar 15, nuts 19 and disc springs 20 are mounted to adjust the position and tilt stiffness.

It will be clear to a person skilled in the art that the invention is not limited to the above-mentioned exemplary embodiments, but can be varied within the scope of the appended claims.

Claims (7)

A pulling mechanism for an extruder (3), comprising a fastening plane (8) for connection to a tractor, such as a grader (1), and towing means (11,13,14) attached to the fastening plane, which at one end are connected to the body of the extruder (6), characterized in that one of the pulling means is a drawbar (11) which is guided substantially freely pivotally in relation to the attachment plane, and that the other two pulling means are force devices (13,14) for controlling the extruder. (3) position. Tensile mechanism according to claim 1, characterized in that the end of the drawbar (11) is provided with a hinge ball (12) arranged in a corresponding plane (10). Tensile mechanism according to Claim 1 or 2, characterized in that the force devices (13, 14) are hydraulic cylinders, one of which is a control cylinder (13) for the plowing angle of the extruder (3) and the lifting cylinder (14) of the other extruder. 4. A towing mechanism according to any of claims 1 to 3, characterized in that a gradient limiter (15-20) is arranged between the fastening plane (8) and the drawbar. Tensile mechanism according to claim 4, characterized in that the slope limiter is formed by a substantially vertical bar (15), at which a lower end (18) has been made a heel, through which a substantially horizontal straight pin ( 16), wherein a hinge bearing is mounted between the pin (16) and the heel and the vertical bar (15) is flexibly and controllably supported on the fastening.