A DEVICE TO PROTECT A WORK TOOL OF AN AGRICULTURAL MACHINE

Abstract

A device to protect a work tool of an agricultural machine, especially a device to protect a work tool of a soil cultivator against overload when hitting an obstacle. The device includes a swinging mounting arranged in connection between a load-bearing frame of the machine and a work tool. The work tool is attached to a tube in a cavity of which there is a shaft fixed in a load-bearing frame and, at the edges of the cavity, at least two resilient sealing rings are arranged in an anti-slip manner, and between the rings, inside the cavity of the tube, oil fill is arranged.

Claims

1. A device to protect a work tool of an agricultural machine, especially a device to protect a work tool of a soil cultivator against overload when hitting an obstacle, containing a swinging mounting arranged in connection between the load-bearing frame of the machine and the work tool, wherein the work tool is attached to a tube in the cavity of which there is a shaft fixed in the load-bearing frame, and that at the edges of the cavity, at least two resilient sealing rings are arranged in an anti-slip manner and that between the rings, oil fill is arranged inside the cavity of the tube.

2. The device to protect a work tool of an agricultural machine according to claim 1, wherein in the cavity of the tube at least one bushing is fixed and that the bushing is, at the same time, slidably mounted on the shaft.

3. The device to protect a work tool of an agricultural machine according to claim 1, wherein on the shaft at least one antifriction bearing is placed and the bearing is, at the same time, placed in the cavity of the tube.

4. The device to protect a work tool of an agricultural machine according to claim 1, wherein the shaft is slidably seated in the cavity of the tube.

5. The device to protect a work tool of an agricultural machine according to claim 1, wherein the work tool is mounted on the shaft in a swinging manner within the range of the resilient deformation of the resilient sealing rings and that the range of the deformation of the resilient sealing rings corresponds to the working swinging angle of the work tool.

6. The device to protect a work tool of an agricultural machine according to claim 1, wherein the inner surface of the resilient rings clamps the shaft tightly and the outer surface of the rings pushes against the tube in an expanding way.

7. The device to protect a work tool of an agricultural machine according to claim 1, wherein the resilient rings push against the tube and against the shaft in the radial direction.

8. The device to protect a work tool of an agricultural machine according to claim 1, wherein the bushing is made of hardened steel.

9. The device to protect a work tool of an agricultural machine according to claim 1, wherein in the cavity of the tube, retaining rings are placed on the shaft beside the resilient rings.

10. The device to protect a work tool of an agricultural machine according to claim 1, wherein the work tool is placed on a holder which is attached to the tube.

11. The device to protect a work tool of an agricultural machine according to claim 1, wherein between the work tool and the frame of the machine, a compression spring is arranged.

12. The device to protect a work tool of an agricultural machine according to claim 11, wherein the compression spring leans, either directly or via the first spacer against the holder of the work tool with its one side, and with its other side, the compression spring leans, in a swinging manner, against at least one tip which is dismantlably attached, via the second spacer, to the load-bearing frame of the machine.

13. The device to protect a work tool of an agricultural machine according to claim 1, wherein the tube is provided with a hole in which a plug is arranged.

Description

OVERVIEW OF THE FIGURES

[0025] The invention will be illuminated in more detail by a drawing in which

[0026] FIG. 1 shows a sectional view of the mounting of the work tool on the shaft seated in the frame of an agricultural machine,

[0027] FIG. 2 shows the general arrangement of the device to protect the work tool of an agricultural machine in a lateral axonometric view, and

[0028] FIG. 3 shows the general arrangement of the device to protect the work tool of an agricultural machine in a rear axonometric view.

EXAMPLES OF THE PERFORMANCE OF THE INVENTION

[0029] The device to protect (FIG. 1, FIG. 2, FIG. 3) the work tool 1 of a cultivator against overload when hitting an obstacle consists of a swinging mounting 2 arranged in connection between the load-bearing frame 4 of the machine and its work tool 1 which is a working disk.

[0030] The work tool 1 is attached to a tube 5 in the cavity 8 of which a shaft Z is seated. The shaft is fixed in the load-bearing frame 4 of the machine, and at the edges of the cavity 8, two resilient sealing rings 9 in an anti-slip manner are arranged.

[0031] According to the first advantageous variant shown, two bushings 6 are fixed in the cavity 8 of the tube 5. These bushings 6 are, at the same time, slidably mounted on the shaft Z.

[0032] According to further variants not shown, two antifriction bearings can be mounted on the shaft Z and the bearings are, at the same time, seated in the cavity 8 of the tube 5 or the shaft Z can be slidably seated directly in the cavity 8 of the tube 5.

[0033] According to the variant shown, the bushings 6 which have considerably higher hardness than the tube 5 are made of hardened steel.

[0034] The work tool 1 is attached to the tube 5 as follows: At first, the work tool 1 is mounted on the holder 3 which is dismantlably attached to a pair of the first spacers 17 attached to the tube 5.

[0035] The shaft Z is mounted in the load-bearing frame 4 of the machine in the following manner: At first, the shaft 7 is seated in a clamping assembly 20 which is part of the third spacer 21 attached to the frame 4 of the machine.

[0036] The work tool 1 is mounted on the shaft Z in a swinging manner within the range of the resilient deformation of the resilient rings 9, and the range of the resilient deformation of the resilient rings 9 corresponds to the working swinging angle (approx. 25 to 30 degrees) of the work tool 1.

[0037] The inner surface 15 of the resilient rings 9 clamps the shaft Z tightly and the outer surface 16 of the rings pushes against the tube 5 in an expanding way.

[0038] The resilient rings 9 are arranged at the edges of the cavity 8 of the tube 5 and push against the tube 5 and against the shaft Z in the radial direction.

[0039] There is oil fill 10 arranged between the resilient rings 9 inside the cavity 8 of the tube 5.

[0040] Beside the resilient rings 9, inside the cavity 8 of the tube 5, retaining rings 13 are placed on the shaft Z and these retaining rings 13 are held in position at the bushings 8 by retaining rings 22.

[0041] Between the work tool 1 and the frame 4 of the machine, is a compression spring 14 which, leans against the work tool 1 and against the frame 4 of the machine at the same time.

[0042] The compression spring 14 leans against the pair of the first spacers 17 in which a holder 3 of the work tool 1 is fixed. The compression spring 14 can also lean against the holder 3 of the work tool 1 directly.

[0043] The other side of the compression spring 14 leans (in a swinging manner) against a tip 19 which consists of two dismantlable pieces which are, through the second spacer 18, attached to the load-bearing frame 4 of the machine.

[0044] The tube 5 is provided with a hole 11 in which a plug 12 is arranged.

[0045] The device works in the following manner: The work tool 1 swings within the range of the resilient deformation of the resilient rings 9 which corresponds to the working swinging angle of the work tool 1 and, when hitting a solid obstacle, the swinging movement is, at the same time, absorbed by the compression spring 14.

INDUSTRIAL APPLICATION

[0046] The device to protect a work tool of an agricultural machine can be used for protection of a work tool of a cultivator, of a fertilizer applicator or of a seeding machine against overload when hitting an obstacle.

LIST OF REFERENCE MARKS

[0047] 1 work toot [0048] 2 swinging mounting [0049] 3 holder [0050] 4 load-bearing frame [0051] 5 tube [0052] 6 bushing [0053] 7 shaft [0054] 8 cavity [0055] 9 resilient ring [0056] 10 oil fill [0057] 11 hole [0058] 12 plug [0059] 13 retaining ring [0060] 14 compression spring [0061] 15 inner surface [0062] 16 outer surface [0063] 17 first spacer [0064] 18 second spacer [0065] 19 tip [0066] 20 clamping assembly [0067] 21 third spacer [0068] 22 retaining ring