FI88850B - Brake unit for a machine for working soil in forests - Google Patents

Description

88850

Forestry cutter brake system

The invention relates to a brake device for a forest cutter, which forest cutter comprises disc wheels with splitting blades arranged on both sides of the frame and which brake device comprises at least one contact member attached to each disc wheel, a trigger member attached to the frame locked disc wheel and cause-10 to cause the rotating disc wheel to lock and the locked disc wheel to release.

Applicant's previously filed patent application 903785 discloses a device for mowing forest land and sowing tree seeds, which is pulled behind a tractor-15, for example. The disc wheels on both sides of the device body rotate as long as they are braked by the brake actuator. The braking of the disc wheels is controlled by a brake control member which controls the hydraulic brake pressure for the disc wheel brakes.

20 Finnish patent application 1728/64 discloses a brake system for a forest cutter, in which oblique-headed contact members are attached to the disc wheels, which act on two successive release members when the wheel rotates. Of these, the first release member releases the braked wheel at the opposite end of the axle 25 and the latter locks the wheel in motion, thereby providing alternating movement of the wheels. The hydraulic locking drums act as a locking element for the wheels.

Finnish patent application 2461/64 also discloses a forest mower equipped with a similar brake system. Also in this brake system, contact means are used which trigger the flow of hydraulic fluid 2 88850 to either side of the hydraulic piston system. Under the action of the hydraulic pressure, the piston moves and the locking member attached to the piston moves to a position in which the rotation of the second spray arm is prevented and the lock arm 5, which is locked, is released accordingly.

Both of the above-mentioned prior art braking devices use a hydraulic system which is prone to breakage and whose reliability under severe load is not optimal.

The object of the invention is to provide a braking device which has a simple structure but at the same time is very reliable. The braking device according to the invention is mainly characterized in that the release member is a handlebar common to both discs and the locking member is a locking rod common to both discs, said movement of the handlebar being arranged to transmit in opposite directions the release of the locking rod.

The braking device according to the invention essentially comprises two rod-like members, one of which acts as a release member and the other as a locking member. The braking system is thus completely mechanical, simple in construction and thus reliable.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a forest cutter with a braking device according to the invention, Figure 2 shows a shaped disc wheel of a forest cutter seen from the side and Figure 3 shows the structure of a braking device according to the invention.

3,88850

According to Fig. 1, the forest cutter comprises two disc wheels 1 and 1 ', from the outer circumference of which protruding blades 2 are radially projecting. laikutusteräsarjän. The disc wheels 5 1 and 1 'are mounted on the frame 3 of the forest cutter in the same way as a normal wheel bearing. The traction tractor 10 pulls the forest disc disc via the boom and in the mowing situation the disc wheels 1 and 1 'alternately brake by means of the locking bar 8 and the locking shoulder 9, whereby the mowing blades make mowing marks 10 alternately with the right and left disc wheels 1 and 1'.

Figure 2 shows a shaped disc wheel 1. In it, the end of the spotting blade 2 is at the same distance as the distance of the circumference of the disc wheel from the center of the bearing point of the body 3.

This has the advantage that the frame does not tilt sideways, because the disc wheel 1 does not have to be pulled over the spotting blades 2 before the spotting braking. The disc wheels 1 and 1 'are housing-like and are shaped flat at the spotting blades 2, thus providing a smooth rotation.

Attached to the disc wheel 1 is a chain 4 or the like acting as a seed covering device, which rakes the mold during braking on the seeds and, for example, fertilizers.

According to Figure 3, in the mechanical brake system 25 of the forest cutter, the disc wheel 1 is preferably locked by means of a locking rod 8, which rests on the frame 3 of the forest cutter. The locking shoulders 9 on the inner side of the disc wheel 1 are radially at the locking rod 8. As the disc wheel 1 rotates, the locking shoulder 9 comes to the locking rod 8 and 30 brakes during the braking period. In this case, the spotting blades 2 are against the ground and the braking cycle ends when the contact member 7 of the rotating disc wheel 1 on the opposite side pushes the guide rod 6 acting as a release member to the locked disc wheel 1 ', the transfer lever 5 moving the 888850 locking rod 8 to the opposite disc wheel In this case, the disc wheel 1 ', which is locked, is released and can rotate.

The braking device thus comprises at least one contact member 7 attached to each of the disc wheels 1 and 5 ', which is typically an inclined surface attached to the inner side of the disc wheels 1 and 1'. As the disc wheel 1, 1 'rotates, the contact member 7 controls the release member 6 belonging to the braking device, which acts as a handlebar 10 common to both wheels, pushing it to the side of the locked disc wheel 1'. The movement of the handlebar 6 is arranged to be transmitted to the locking member 8, on which a locking rod common to both disc wheels 1 and 1 'acts. Said movement is transmitted to the body 3 of the forest cutter by means of a pivoting lever 5 which is pivotally articulated. In this case, the transmission lever 5 moves the locking rod 8 to the opposite side of the rotating disc wheel 1, whereby the disc wheel 1 'in the locked position is released. Attached to the disc wheel 1 and 1 'are locking shoulder protrusions 9 projecting therefrom, which are arranged to come into contact with the locking rod 8 to lock the disc wheel 1. When the next locking shoulder 9 of the rotating disc wheel 1 comes into contact with the locking bar 8, they come into contact and the rotating disc wheel 1 locks. The locking of the disc wheel 1 takes place at the same time as the insertion blade 2 of the disc wheel 1 in the shifting gear 25 is in the down position.

The invention is not limited to the embodiment described above, but can be modified within the scope of the appended claims.

Claims (3)

A braking system for a forest ground preparation machine, the ground preparation machine comprising on each side of the frame (3) provided with discs (2, 1) provided with disc wheels (1, 1 ') and said braking system comprises at least one til each disc wheel (1, 1). ') touching means (7), a release means (6) attached to the frame (11) and a reading means (8) which impede the rotation of the disc wheel (1, 1'), the release means (6) being arranged to act with the action of the touching means (6). (7) is displaced against the Iästä disc wheel (1 ') and allows reading of the rotating disc wheel (1) and release of the loaded disc wheel (1') characterized in that a release wheel (1, 1 ') functions as a release means. common guide rod (6) and as a reading means functions a common reading rod (8) for both disc wheels (1), wherein said movement of said guide rod (6) is arranged to be transmitted to an opposite directed movement of the guide rod (8). is to release the Iästä disc wheel (1 '). Braking system according to claim 1, characterized in that said movement is arranged to be mediated by a switching lever (5) rotatably guided by the frame (3). Braking system according to claim 1, characterized in that the reading bar (8) in the loading position of the disc wheel (1 ') is in contact with a reading bracket (9) attached to the disc wheel (1').