JPH0142409Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for connecting a working machine such as a rear-mounted sprayer to a tractor so that it can be vertically raised and lowered and fixed.

Heavy work equipment such as rear-mounted sprayers must be connected as close to the tractor as possible due to the front-rear weight balance. In addition, especially in the case of a sprayer, due to the nature of the work it is required to maintain an appropriate distance from the ground and be connected vertically. Therefore, connecting these working machines to a tractor is a very troublesome and dangerous task because it must be done in a narrow space between the tractor and the working machine. In addition, with a coupling device that causes the work machine to tilt back and forth when the work machine is raised or lowered to maintain the work machine at an appropriate ground height, the greater the weight of the work machine becomes, the more troublesome it becomes to correct the inclination. Therefore, there is a need for a coupling device for the work equipment that can be easily connected to the tractor even in a narrow space, and that can also raise and lower the work equipment without the need to correct the inclination and fix it at an appropriate height. ing.

Therefore, an object of the present invention is to provide a working machine coupling device that can satisfy the above-mentioned demands.

That is, in order to achieve the above-mentioned object, the present invention includes a work equipment lifting plate that protrudes rearward from the upper end of the prismatic column and whose tip is formed into an upwardly bent engagement part, and a U-shaped plate at the lower end of the prismatic column. An elevating body has a symmetrical shaped arm projecting diagonally downward and rearward, and a work equipment steady rest catch and a lower link hitch pin are provided on both upper and outer surfaces of the elevating body, and the front end is vertically attached to the top link bracket of the tractor. The prism is vertically inserted between the guide rollers in a vertically movable manner, and the lower link hitch pin is attached to the lower link of the tractor. A lifting body fixing pin is removably connected to the link hitch and horizontally communicates the lifting body guide with the prism, and a bracket is vertically installed in the center of the upper front of the work equipment frame, into which the work equipment lifting plate is loosely fitted from the front. A work equipment lifting pin is installed horizontally on the upper part of this bracket, a work equipment steadying protrusion is fixed on the lower surface of the work equipment frame, and a work equipment lifting plate is loosely fitted into the bracket to raise and lower the lifting body. , the upward bending engagement part rises from below and contacts the work equipment lifting pin to lift the work equipment, and in synchronization with the above contact, the work equipment steady rest seat also rises from below and the work equipment is lifted up. The main feature is that it is configured to fit into the machine stabilizing protrusion, and that the elevating body can be fixed and released at an appropriate height via the elevating body guide via the elevating body fixing pin.

Hereinafter, a description will be given based on the embodiments shown in the drawings. In FIGS. 1 to 3, the elevating body 1 is
At the upper end of the prism 2, bend the tip upward and engage the engaging part 3.
A work equipment hoisting plate 4 formed in the form of 4 is provided to protrude rearward, and a U-shaped arm 5 is provided at the lower end of the square column 2 to project symmetrically and diagonally downward to the rear, and work equipment steady rest supports 6, 6, and lower link hitch pins 7, 7 are removably provided on both outer surfaces. 8, 8... is,
This is a pin hole for adjusting the attachment position of the lower link hitch pin 7 in accordance with the length of the lower link hitch of the tractor, and 9 is a reinforcing cross beam with both ends fixed to both outer sides. The pin holes 10, 10, . do.
The elevating body fixing pin 11 (see FIG. 6) communicates with a pin hole 26 bored in the elevating body guide 14, which will be described later, and the pin hole 10, and is connected to the outside of the elevating body guide 14 as shown in FIG. The protruding tip is prevented from coming off with a stopper plug 27. 12 and 13 are reinforcing pieces for the work machine lifting plate 4. Moreover, the prism 2 is made hollow to reduce weight.

FIG. 7 shows another embodiment of the elevating body 30.
is the same as the elevating body 1 except for the work machine steady rest seat 31. The work machine steady rest seat 31 has a groove portion having a U-shaped longitudinal section shown in FIG. 8 fixedly provided on the upper surface of the U-shaped arm 5 along the longitudinal direction.

As shown in FIG. 2, the elevating body guide 14 has side plates 15 and 16 of the same shape arranged in parallel on the left and right, and a pin hole 17 is provided horizontally in the front end, and as shown in FIG.
It is connected to the top link bracket 19 of No. 8 through a top link pin 20 communicating with the pin hole 17 so as to be vertically movable. Inside the elevating body guide 14, a guide roller 21 is connected to the side plate 1 via a guide roller shaft 24 and a nut 25 in front and rear and vertically opposite directions.
5, 16 so that it can rotate freely. The guide roller 21 has flanges 22 at both ends, as shown in FIG.
, and a bearing hole 23 is provided in the center thereof.
FIG. 5 shows the guide roller shaft 24 and nuts 25 screwed onto both ends thereof. And the guide roller 21
The bearing hole 23 is rotatably fitted around the guide roller shaft 24, and is attached to the side plates 15 and 16 as described above. The pin holes 26 in FIG. 1 are bored to communicate with the pin holes 10, and the elevating body fixing pins 11 are inserted therethrough.In order to adjust the fixing position of the elevating body 1, two pin holes are formed, upper and lower.

Elevating body 1 explained above (same as elevating body 30)
As shown in FIG.
When the elevating body 1 is connected to the lower link hitch 28 of the tractor 18 via the lower link hitch pin 7, the front and rear edges of the front and rear surfaces and both sides of the square column 2 are connected to the cylindrical surface of the guide roller 21, respectively. It is assembled so that it comes into contact with the inner circumferential surface of the flange 22 and is vertically movable up and down through the up and down movement of the lower link hitch 28. Furthermore, the guide rollers 21 are arranged in the elevating body guide 14 so that the elevating body 1 is moved as close to the tractor 18 as possible within a range where the elevating body 1 can be raised and lowered without interfering with the tractor. Also, 29 in FIG. 12 is a lower link hitch connection pin.

Next, the configuration of the working machine side will be explained with reference to FIG.
32 schematically shows a working machine, and 33 is a working machine frame. Reference numeral 34 denotes a leg stand provided on both sides of the lower part of the work equipment frame 33, which supports the work equipment 32 almost vertically on the ground, and when the work equipment 32 is connected to a tractor and lifted from the ground, it is moved outward as shown by the chain line. It can be bent and locked in the opposite direction. Reference numeral 35 denotes a bracket, which is vertically disposed at the center of the upper front surface of the work machine frame 33 so that the work machine lifting plate 4 can be fitted loosely from the front, and a work machine lifting pin 36 is installed horizontally on the upper part. That is, in FIG. 11, the work equipment lifting pin 36 is inserted into a pin hole 37 provided horizontally in the upper part of the bracket 35, and has spring stopper plugs 38 detachably attached to both ends of the bracket 35.
The bracket 35 is brought into contact with the inner surface of the bracket 35 and fixed so as not to come off laterally, and both ends thereof are slightly protruded to the outside of the bracket 35 in order to come into contact with the upwardly bent engagement portion 3 of the work equipment lifting plate 4. Then, the bracket 35 and the work equipment lifting pin 36 lower the lower link hitch 28 to near the lower limit using the hydraulic pressure of the tractor 18, and the tractor 1
8, the work equipment lifting plate 4 is loosely fitted into the bracket 35 from the front, and the upwardly bent engagement portion 3 can be positioned directly below the work equipment lifting pin 36. The rear end surface of the upper plate 4 is provided so as to face the front surface of the working machine frame 33 with a slight gap therebetween (see FIG. 12). As shown in FIG. 3, the reason why the tip of the work equipment lifting plate 4 is expanded slightly outward is because the work equipment lifting plate 4 is loosely fitted (in this case, externally fitted) into the bracket 35 as described above. This is to make it easier.

Furthermore, the rearward projecting dimension of the working machine lifting plate 4 and the forward projecting dimension of the bracket 35 are selected so as to bring the working machine 32 as close to the elevating body 1 as possible.

39 in Figure 11 is the work equipment lifting plate fixing pin,
When the upwardly bent engagement portion 3 of the work equipment lifting plate 4 comes into contact with the work equipment lifting pin 36, the work equipment lifting plate 4 is fixed to the bracket 35.
A pin hole 40 provided in horizontal communication is communicated with a pin hole 41 (see FIG. 1) provided in horizontal communication in the work equipment lifting plate 4, and is prevented from coming off with a spring stopper 42 at the tip. What, this work machine lifting plate fixing pin 39
This is not essential, but is used just in case to prevent the work equipment lifting pin 36 from coming off from the work equipment lifting plate 4 due to the work equipment 32 jumping up due to strong vibrations such as when traveling on rough terrain.

Reference numeral 43 in Fig. 9 is a work machine steady rest protrusion, which is horizontally fixed to the lower surface of the work machine frame.
In the state shown in the figure, that is, when the upwardly bent engagement portion 3 of the work equipment lifting plate 4 is located directly below the work equipment lifting pin 36, the work equipment steady rest rests directly above the work equipment steady rest catch seat 7. It is provided so as to face downwardly to the catch seat 7. As the elevating body 1 rises, the upward bending engagement part 3 rises from below and approaches the work equipment lifting pin 36. At the same time, the work equipment steady rest seat 6 also rises from below to prevent the work equipment from swinging. It begins to fit into the stop protrusion 43, and the upwardly bent engagement portion 3 engages the work equipment lifting pin 36.
When the work machine steady rest protrusion 43 comes into contact with the work machine steady rest protrusion 43, the bottom surface and front and rear surfaces thereof are completely fitted to the work machine steady rest receiving seat 6 with a slight gap therebetween.

The work machine steady rest protrusions 44 shown in FIG. 10 show another embodiment, and are arranged downwardly in parallel on both sides of the lower surface of the work machine frame 33, and are mounted on the work machine steady rest receivers described in FIGS. 7 and 8. 31, 31, as in the case of FIG. 9, when the upward bending engagement portion 3 comes into contact with the work equipment lifting pin 36, both sides and the bottom of the work equipment steady rest protrusion 44 move in synchronization with the contact with the work equipment lifting pin 36. Machine steady catch 3
1 with a slight gap.

Next, the connection between the working machine 32 and the tractor 18 using the device of the present invention will be described together with its operation. First, the stopper 27 is removed, the elevating body fixing pin 11 is removed from the device, and the lower link hitch 28 is lowered to near the lower limit of descent using the hydraulic pressure of the tractor, and the elevating body 1 is lowered.
Next, as shown in FIG. 12, the tractor 18 is retreated in front of the work equipment 32, the work equipment lifting plate 4 is loosely fitted into the bracket 35, and the upwardly bent engagement portion 3 is moved back to the front of the work equipment 32. It is positioned directly below the pin 36, and the lower link hitch 28 is raised by the hydraulic pressure of the tractor 18. When the lower link hitch 28 rises, as shown in FIG. rises from below and loosely fits into the work machine steady rest protrusion 43.
When the lower link hitch 28 is further raised, the work equipment lifting plate 4 pushes up the work equipment lifting pin 36 as the elevating body 1 rises, and the work equipment 32 rises almost vertically high above the ground as shown in FIG. 14. When the elevating body 1 mentioned above rises, the elevating body guide 14 swings slightly around the top link pin 20, and the front and rear edges of the front and rear surfaces and both outer surfaces of the prism 2 are moved by the guide rollers 21, respectively. Since the prism 2 is in contact with the cylindrical surface and the inner surface of the flange 22, the prism 2 does not come into direct contact with the side plates 15, 16, and the elevating body 1 rises almost vertically and smoothly through the rotation of the guide roller 21.

When the work machine 32 rises as described above, the weight of the work machine 32 generates a moment around the work machine lifting pin 36 that causes the work machine 32 to approach the tractor 18. Since the work machine steady rest seat 6 and the work machine steady rest seat 6 are loosely fitted, the work machine 32 hardly rotates around the work machine lifting pin 36. In addition, due to the loose fit described above, the bottom surface of the work machine steady rest 43 limits horizontal swing, so that the work machine 32 hardly swings left or right. Furthermore, since the work implement lifting plate 4 is loosely fitted into the bracket 35, the work implement 32 can only swing slightly left and right with respect to the elevating body 1. in the end,
The working machine 32 is connected to the tractor 18 so that it hardly swings back and forth, right and left, and can be raised and lowered almost vertically.

In the state shown in FIG. 14, the working machine 32 is raised to a desired height, the lifting body 1 is fixed to the lifting body guide 14 with the lifting body fixing pin 11, and the working machine lifting plate 4 and the bracket 35 are connected to the lifting body 1. An upper plate fixing pin 39 is attached, and the leg base 34 is bent and locked outward.

As described above, the elevating object 1 is fixed with the elevating object fixing pin 11.
When fixed, the prism 2 is in front of the front and back and both sides,
Since the rear edges are in contact with the cylindrical surface of the guide roller 21 and the inner circumferential surface of the flange 22, it does not move forward, backward, left or right with respect to the elevating body guide 14.
fixed in one piece. When they are fixed together in this way, the distance between the top link pin 20 and the lower link hit pin 7 becomes constant as shown in FIG. Since the distances from the lower link hitch connecting pin 29 to the top link pin 20 and lower link hitch pin 7 are each constant depending on the brand of the tractor, the top link pin 20, the lower link hitch connecting pin 29, and the lower link hitch pin 7 are fixed.
The triangle with the apex of
It is fixed at 8. Therefore, even if the lower link hitch 28 is not held hydraulically, the work implement 32 will not descend. Even if the work equipment lifting plate fixing pin 39 is removed in the state shown in Fig. 14, the work equipment 32
Since the weight of the work equipment is constantly applied to the work equipment lifting pin 36, the upward bending engagement part 3 and the work equipment lifting pin 36 strongly contact each other, and in most cases, the upward bending engagement part 3 is not allowed to lift the work equipment. Since the upper pin 36 does not go over, the working machine lifting plate fixing pin 39 hardly needs to be used.

Next, to disconnect the work equipment 32 from the tractor 18, raise the footrest 34, remove the work equipment lifting plate fixing pin 39 if used, and apply hydraulic pressure to the lower link hitch 28 to connect the work equipment 32. , remove the elevating body fixing pin 11, and lower the lower link hitch 28. Then, the elevating body 1 descends within the elevating body guide 14, the footrest 34 touches the ground, and the working machine 32 is supported on the ground. When the lower link hitch 28 is further lowered, the work equipment lifting plate 4 is moved to the work equipment lifting pin 36 as the elevating body 1 is lowered.
Then, the work machine steady rest catch seat 6 separates from the work machine steady rest protrusion 43, and the connection between the tractor 18 and the work machine 32 is released.

FIG. 15 shows a case where an elevating body 30 is used instead of the elevating body 1, and the tractor 18 is retreated in front of the working machine 32 in the same way as explained in FIG. 12. In this case as well, the work machine steady rest catch 3
1. The only difference is that the work machine steady rest protrusion 44 is different from that shown in FIG. 12, and the operation of lifting the work machine 32 from the state shown in FIG. 13 to the state shown in FIG. 14 and fixing it with the lifting body fixing pin 11 is completely unnecessary. The same is true.

As is clear from the above explanation, the present invention aims at inserting the elevating body into the elevating body guide as close to the tractor as possible, and adjusting the dimensions of the rear protrusion of the work equipment lifting plate from the elevating body and the work equipment frame. The dimensions of the front protrusion of the bracket are designed to bring the work equipment as close to the lifting body as possible, and the lower link hitch pin is connected to the lower link hitch of the tractor so that the prism can be raised and lowered almost vertically. Therefore, the working machine can be connected as close as possible to the tractor and can be raised and lowered vertically, making it unnecessary to correct the inclination of the working machine when ascending. Moreover, to connect the work equipment, lower the lower link hitch, move the tractor backwards, and loosely fit the work equipment lifting plate into the bracket on the front of the work equipment frame. When the lower link hitch is raised by the hydraulic pressure of the tractor, the upward bending engagement part will automatically come into contact with the work equipment lifting pin, and the work equipment steady rest catch will also be brought into contact with the work equipment steady rest protrusion. The operation is extremely simple because it fits loosely and the working machine can be raised vertically to the tractor and connected with almost no shaking. Other than the simple operation of raising and lowering the elevating body to an appropriate height using the hydraulic lift of the lower link hitch and fixing it with the elevating body fixing pin,
There is no need to approach the narrow space between the tractor and the work equipment, and the connection can be made safely.

In addition, since the elevating body and the elevating body guide can be connected to the tractor by simply connecting pins to the lower link hitch and top link bracket, respectively, it is easier to connect the work equipment to a conventional hydraulic three-point link. It can be connected to the tractor with no changes and with a short amount of effort.Furthermore, after the elevating body is fixed to the elevating body guide with the elevating body fixing pin, the work equipment can be moved to the desired position without having to hold the lower link hitch hydraulically. Since the tractor can be held at a height of 1,000,000 yen, it has many advantages such as not putting strain on the tractor's hydraulic system during work.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the main part of the part connected to the tractor, FIG. 2 is a partially cutaway front view of FIG. 1, and FIG. 3 is a plan view of FIG. 1. ,
Figure 4 is an enlarged front view of one part in Figure 1 with a partial cutaway, Figures 5 and 6 are respectively enlarged front views of one of the parts in Figure 1, and Figure 7 is the part connected to the tractor. 8 is a longitudinal cross-sectional end view taken along the line A-A in FIG. 7, and FIG. 9 is a schematic front view of the working machine showing some operations with dotted lines. , FIG. 10 is a schematic front view of a working machine showing another embodiment,
Fig. 11 is an exploded perspective view enlarging a part of the front of the working machine, Figs. 12 to 14 are side views schematically showing the connecting process of the device of the present invention, and Fig. 15 is another embodiment of the connecting process. FIG. 2 is a side view schematically showing one aspect of the invention. 1, 30...Lifting body, 2...Prismatic column, 3...Upward bending engagement part, 4...Work machine lifting plate, 5...U-shaped arm, 6,31...Work machine steady rest receiver ,7...
...Lower link hitch pin, 11... Elevating body fixing pin, 14... Elevating body guide, 18... Tractor,
19...Top link bracket, 20...Top link pin, 21...Guide roller, 28...
Lower link hitch, 32... Work machine, 33... Work machine frame, 35... Bracket, 36... Work machine lifting pin, 43, 44... Work machine steady rest protrusion.

Claims (1)

[Scope of utility model registration request] A work equipment lifting plate whose tip portion is formed into an upwardly bent engagement portion is provided at the upper end of the prismatic column to protrude rearward, and a U-shaped arm is provided at the lower end of the prismatic column to protrude symmetrically and diagonally downward to the rear, The elevating body is equipped with a steady rest seat and a lower link hitch pin on the upper and outer surfaces of both sides, and its front end is connected to the top link bracket of the tractor so that it can move up and down, and a guide roller is installed inside it, back and forth and up and down. The prism is vertically inserted between the guide rollers of vertically disposed lifting body guides arranged horizontally, and the lower link hitch pin is connected to the lower link hitch of the tractor,
An elevating object fixing pin that connects the elevating object guide and the square pillar laterally is provided in a removable manner, and a bracket is vertically installed in the center of the upper front of the work equipment frame into which the work equipment lifting plate is loosely fitted from the front. By installing the work equipment lifting pin horizontally, fixing the work equipment steadying protrusion on the underside of the work equipment frame, and then loosely fitting the work equipment lifting plate into the bracket and lifting the lifting body, the work equipment can be folded upward. The curved engagement part rises from below and comes into contact with the work equipment lifting pin to lift the work equipment, and in synchronization with the above contact, the work equipment steady rest catch also rises from below and touches the work equipment steady rest protrusion. A working machine coupling device characterized in that it is configured to fit loosely and is capable of fixing and releasing an elevating body to an elevating body guide at an appropriate height via an elevating body fixing pin.