JPS639761Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a turnbuckle device used for expansion/contraction adjustment in various parts of a work equipment mounting device of an agricultural tractor.

The turnbuckle device has a turnbuckle right screw rod and a turnbuckle left screw rod screwed into a turnbuckle cylinder, and by relatively rotating the turnbuckle cylinder, the screws in opposite left and right directions advance in opposite directions, and the turnbuckle is rotated. This allows the entire device to expand and contract.

The reason why this turnbuckle device is used for each part of a tractor is that there are a wide variety of working machines attached to agricultural tractors, and it is necessary to set the mounting position in accordance with each working machine. For this reason, it was necessary to adjust the turnbuckle each time the work machine was replaced, and when a previously installed work machine was to be reinstalled, it was necessary to make adjustments again based on skill and experience.

In this invention, an indicator groove is provided on the turnbuckle screw rod, and numbers and pictures are displayed to indicate the degree of expansion and contraction.By confirming the proper top link position for each work machine, it is possible to install the same work machine next time. There is no need to make adjustments based on intuition and experience.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a side view of a three-point link type work implement mounting device installed at the rear of an agricultural tractor, and FIG. 2 is a plan view of the same.

A PTO shaft 17 protrudes from the rear surface of the rear axle case 6 to transmit power to a work machine installed in a work machine mounting device. Further, rear axle housings 7, 7 are protruded from the left and right sides of the rear axle case 6, and the check chain 10 of the lower link 11 is directed toward the middle part of the lower link 11 from the lower part of the rear axle housing 7 near the fender mounting base 31. It's out. Further, a rear axle 8 is supported by a rear axle housing 7. The pivot base of the lower link 11 is also provided near the base of the rear axle housing 7. A lift arm 14 rotatably projects from a hydraulic case 5 provided on the upper surface of the rear axle case 6, and a pivot body 16 of a top link hinge 15 is fixed to the rear surface of the hydraulic case 5. The top link hinge 15 is pivotally supported by a pivot pin 16a of a pivot body 16, and is configured to be rotated by a traction force applied to the top link A for draft control.

A lift link 12 is attached to the tip of the lift arm 14,
12 is pivotally connected to the left and right lower links 11, 11. The tip of the lift link 12 is pivotally connected to the middle part of the lower link 11.

The lower link 11 is configured to be separable from its tip 27, and after the lower link tip 27 is removed and pivoted to the pin of the working machine, the square cylindrical portion 25 fixed to the lower link 11 is opened. If you insert it into the square hole, insert the pin 30 and temporarily secure it, and then move the tractor backwards toward the work equipment, the switching lever 26 will spring downward when the lower link tip 27 is inserted all the way. pivot point 29
The machine rotates around the center and the work equipment is completely set.
28 is a handle portion of the switching lever.

Lower link tip 2 for both left and right lower links
7 is configured to be divisible.

In such a three-point link type work machine mounting device, the main part of the present invention is located in the top link A section. The tip of the top link A is pivoted to the top link hinge 15 with a pivot pin 18, the rear end is pivoted to the top link mast of the working machine with a pivot pin 19, and the length of the top link is adjusted at the center. It is a turnbuckle device. The top link A is composed of a turnbuckle right screw rod 2, a turnbuckle cylinder body 1, a turnbuckle left screw rod 3, and a rotation stopper 4. The detent fitting 4 has its base pivotally supported by a support part which is provided on the outer surface of the turnbuckle cylinder body 1 and also serves as a wrench hook protrusion 20. It is fixed with a spring that crosses the fulcrum, and in order to adjust the length of the top link A by turning the turnbuckle cylinder 1, attach the detent fitting to the turnbuckle right screw rod 2.
After releasing the engagement, the turnbuckle cylinder 1 is rotated and adjusted by holding the detent fitting 4.

3 is a partially sectional plan view of the turnbuckle right screw rod 2, FIG. 4 is a side view thereof, and FIG. 5 is a sectional view taken along the line B--B in FIG. 3.

The central portion is chamfered to form a flat portion 2b, into which the distal end engagement portion 4c of the detent 4 is externally fitted. Further, display grooves 2c for displaying the degree of expansion and contraction of the turnbuckle device are carved at regular intervals in the circular arc portion of the flat portion 2b to display the degree of adjustment of the turnbuckle. 2a is a ball joint portion that allows the top link A to freely rotate vertically and horizontally, and 2d is a right-hand screw portion.

FIG. 6 is a partially sectional plan view of the left turnbuckle screw rod 3, and FIG. 7 is a side view thereof.

The turnbuckle left threaded rod 3 is also provided with display grooves 3c at regular intervals to indicate the degree of expansion and contraction, with 3a being a ball joint part and 3d being a left threaded part.

FIG. 8 is a side view of the turnbuckle cylinder 1, and FIG.
The figure is also a sectional view, and FIG. 10 is a drawing in which a spanner 21 is engaged with the spanner hook protrusion 20. 8th
The turnbuckle cylindrical body shown in FIGS. 9, 9, and 10 is made of a single pipe material by drawing the pipe material, and has both ends 1e, 1f and a middle part 1a,
A total of 4 locations in 1b are drawn. Aperture part 1a
A right-hand threaded portion 1c is carved on the inner surface of the constricted portion 1b, and a left-hand threaded portion 1d is carved on the inner surface of the constricted portion 1b, thereby making it possible to thread the turnbuckle right threaded rod 2 and the turnbuckle left threaded rod 3. The outer constricted parts 1e and 1f act as steady rests for the turnbuckle threaded rods 2 and 3, and prevent buckling of the top link so that the threaded part does not break when a strong compressive force is applied to the top link. There is.

FIG. 11 is a side view of the turnbuckle cylindrical body 1 constructed by welding pipe materials, FIG. 12 is a sectional view, and FIG. 13 is a rear view.

Cylindrical parts 1g and 1j for steady rest are provided at both ends,
Insert the right screw part 1h and the left screw part 1i in the middle,
In between, the entire turnbuckle body 1 is welded via pipes 1h, 1l, and 1m.

The wrench hooking protrusion welded and fixed to the outer surface of the turnbuckle cylinder body 1 is a part that was a support part of the detent fitting and is provided with a flat part 20c that can be engaged with the wrench 21. The base portions 4b and 4a of the spring rods of the stopper 4 were forced eccentrically and inserted into the insertion holes 20a and 20b. Taking advantage of the fact that this support part is rectangular and can be engaged with a wrench, a flat part 20c is provided by extending it to form a wrench hook protrusion 20. It is necessary to apply the wrench 21 to this part to turn the turnbuckle cylinder 1 in special cases such as when the screw is rusted. Normally, the detent fitting 4 is also used as a turning lever. be.

FIG. 14 is a side view of the detent fitting 4, FIG. 15 is a plan view, and FIG. 16 is a rear view.
FIG. 7 is a front view as well.

The detent fitting 4 is composed of a spring rod, and its base portions 4a and 4b are opened to both sides and forcibly eccentrically inserted into the insertion holes 20a and 20b of the wrench hook protrusion 20, which also serves as a support portion of the detent fitting 4. By inserting the tip engaging portion 4c, the tip engaging portion 4c is biased and engaged with the flat portion 2c of the turnbuckle screw rod 2. When rotating the turnbuckle cylinder body 1 to extend and retract the top link A, by forcefully pulling up the detent metal fitting, it is pushed beyond the fulcrum point to a position where it can be easily held as a turning lever.

FIG. 18 is a plan view of a conventional turnbuckle cylinder 1, and FIG. 19 is a side view thereof.

The conventional turnbuckle cylindrical body 1 had a right-hand threaded part 1b' and a left-hand threaded part 1a' carved directly on both ends, so there was no part for steadying, and when a strong compressive force was applied to the top link A. There was a problem in that the space between the turnbuckle threaded rod and the turnbuckle cylinder body 1 was strained, damaging the threaded part, and a chain 32 was provided on top of the rotary lever 22 to prevent it from rotating.

The present invention improves the defects of this conventional device.

As described above, the present invention provides a turnbuckle device that constitutes the top link of an agricultural tractor.
Female threads in opposite directions to the left and right, into which the left and right turnbuckle screw rods are screwed, are carved in two places in the middle of the turnbuckle cylinder, and a small-diameter steady rest is installed inside the end of the turnbuckle cylinder. Established a department,
In the non-threaded part of the turnbuckle threaded rod, display grooves or scales for displaying the amount of expansion and contraction are displayed at regular intervals in the part that overlaps with the end steadying part of the turnbuckle cylinder body, so that the following effects are achieved. It is.

First, there are a wide variety of implements attached to agricultural tractors, and due to regional differences, differences in field crops, rice paddies, etc., when implements are replaced, operators must adjust the top link length each time. There is. At that time, by providing scales engraved at regular intervals as in the present invention, the operator can check the position of the scales in an analog manner, thereby ensuring that the operating machine is always in the optimal condition. It can be done. On the other hand, in the case of the conventional technique disclosed in Japanese Utility Model Publication No. 51-13673, there is only one scale, so it is not possible to confirm and store the top link length for each of a wide variety of working machines.

Second, instead of providing the scales overlappingly on the threaded portions of the turnbuckle threaded rods 2 and 3 as in the prior art, the threaded portions of the turnbuckle threaded rods 2 and 3 are placed at the back of the turnbuckle cylinder body 1. The part corresponding to the end steadying part of the turnbuckle cylinder body 1 is configured as a non-threaded part,
Since display grooves and scales are provided in this area, it is easy for the operator to read, and the display section and scales are difficult to erase.

Thirdly, by contacting the small diameter portion of the end of the turnbuckle cylinder 1 with the non-threaded portions of the turnbuckle screw rods 2 and 3, it is possible to prevent the turnbuckle screw rods 2 and 3 from swinging, and the top link can be prevented from swinging. Even if a load is applied in the compressive direction, it will not buckle easily, and because the two are in contact, the display and scale will not be crushed and disappear, and the position of the scale can be read accurately. It is.

In the conventional technology, there is no steady rest part, and the display part is engraved on the screw part, so the screw is easily destroyed by the compressive load applied to the top link, and the scale is also easy to disappear. .

[Brief explanation of the drawing]

Figure 1 is a side view of the three-point link type work equipment mounting device installed at the rear of an agricultural tractor, Figure 2 is a plan view of the same, Figure 3 is a partial cross-sectional plan view of the turnbuckle right screw rod, and Figure 4 is The same is a side view, FIG. 5 is a cross-sectional view taken along line B-B in FIG. 3, FIG. 6 is a partially sectional plan view of the left turnbuckle screw rod, FIG. side view,
Fig. 9 is a cross-sectional view, Fig. 10 is a drawing in which the spanner is engaged with the protrusion for the spanner, Fig. 11 is a side view of the turnbuckle cylindrical body constructed by welding pipe material, and Fig. 12 is Similarly, cross-sectional view, No. 13
14 is a side view of the detent fitting 4, FIG. 15 is a plan view, FIG. 16 is a rear view, FIG. 17 is a front view, and FIG. 18 is a conventional turnbuckle cylinder. 19 is a plan view, and FIG. 19 is a side view. A...Top link, 1...Turnbuckle cylinder, 2...Turnbuckle right screw rod, 3...Turnbuckle left screw rod, 2c, 3c...Display groove, 4
...An anti-rotation fitting.

Claims (1)

[Scope of utility model registration request] In a turnbuckle device constituting the top link of an agricultural tractor, two female screw portions are carved in the middle of the turnbuckle cylinder near the center, and the left and right female threads are threaded in opposite directions, and the left and right female threads are screwed into the turnbuckle cylindrical body. A small-diameter steady rest is provided inside the end of the cylinder, and a display groove or scale for displaying the amount of expansion and contraction is provided in the non-threaded part of the turnbuckle threaded rod and the part that overlaps with the end steady rest of the turnbuckle cylinder. A turnbuckle device for an agricultural tractor characterized by displaying images at regular intervals.