JPH0729773Y2 - Holding stand for work equipment for tractors - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention connects a working machine to a hitch frame connected to a rear portion of a tractor through a top link and a lower link, or separates the working machine from the hitch frame. The present invention relates to a holding stand for a working machine for a tractor, which is used to hold the working machine in a predetermined posture when performing.

[Conventional technology]

In this type of conventional holding stand, when the working machine is lowered to separate it from the hitch frame and the stand is grounded, the stand may fall sideways due to the drop impact of the working machine at that moment. Had a problem that the working machine was twisted with respect to the tractor, the top hook portion was twisted, and the top hook portion could not be lowered, so that the working machine could not be removed from the hitch frame.

In addition, when the working machine is hoisted to connect it to the hitch frame, the working machine and the stand may rotate together and fall sideways. In this case, the position of the center of gravity of the working machine is the top position. There was a problem in that the left and right lower hook parts were displaced from the line connecting the hook part and the grounding point of the stand, and the connection became impossible.

Therefore, focusing on these problems, by forming a long hole into which a stand is fitted and inserted in a support plate attached to a tool bar of a work machine, and regulating the widthwise dimension of the long hole with respect to the outer diameter of the stand, the work machine A technical means has been proposed to prevent the stand from falling sideways when the work machine is attached or detached.However, with this technical means, the stand must support half the weight of the work machine when the work machine is detached, so Considering drop impact, the plate thickness of the support plate must be made sufficiently thick, and the machining accuracy in the width direction of the elongated hole must be kept extremely good. However, in reality, it is extremely difficult to keep the processing accuracy good, and it is impossible to prevent the stand from falling sideways when the processing accuracy is poor.

[Problems to be solved by the device]

In view of the above situation, the present invention was devised to eliminate the conventional drawbacks, and its purpose is to ensure that the stand attached to the toolbar does not fall sideways when the working machine is detached. It is regulated to prevent the work machine from twisting with respect to the tractor and to prevent the work machine from being disengaged due to the twisting of the top hook.In addition, when the work machine is connected, the above-mentioned stand and the work machine should not fall sideways. It is an object of the present invention to provide a holding stand for a working machine for a tractor, which can be surely regulated so that the working machine cannot be connected due to the displacement of the lower hook portion and the working machine can always be quickly and accurately attached and detached.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a technical point means taken by the present invention is a stand for holding a working machine attached to and detached from a hitch frame connected to a rear portion of a tractor via a top link and a lower link in a predetermined posture. , The stand is composed of a support plate attached to a tool bar of a working machine, and a pipe that can swing back and forth within a certain range with respect to the support plate,
On the outer periphery of the support plate, the front end is in contact with the rear surface of the tool bar, and the inner surface is in contact with both side edges of the load seat of the working machine fixed to the pipe, and a cover body for preventing the pipe from falling sideways is integrally formed. A ground plate is extendedly formed at a lower end of the tractor in a direction orthogonal to the front-rear direction of the tractor.

[Action]

Therefore, according to the present invention, when the working machine is lowered when the working machine is disengaged, the stand is grounded, and at that moment, the stand receives a drop impact of the working machine, but the stand is in a direction orthogonal to the front-back direction of the tractor. Rotation is prevented by the grounding plate that is grounded to the ground and the load receiving seat of the working machine whose both edges are in contact with the inner surface of the cover body that is fixed to the outer periphery of the support plate attached to the toolbar. Since the support plate is prevented from rotating by the end portion of the cover body that is in contact with the stand body, the stand is surely prevented from falling sideways when the work machine is dropped and impacted. For this reason, the work machine may be twisted with respect to the tractor,
As a result, the top hook portion is not twisted, and the working machine is reliably removed while being held in a predetermined posture by the stand.

Further, when connecting the work machine, after connecting the top hook portion, when the work machine is hoisted, the work machine rotates forward with the top hook portion as a fulcrum and the lower hook portion is connected. The supporting stand is prevented from rotating as described above, and the support plate is also prevented from rotating, so when the working machine is hoisted, it is possible to ensure that the stand and the working machine do not fall sideways integrally. Regulated. For this reason,
When connected, the work implement and the stand rotate together and fall sideways, or the center of gravity of the work implement deviates from the line connecting the top hook part and the grounding point of the stand, and the lower hook part may be displaced. The work machine is reliably connected by the stand while being held in a predetermined posture.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 7, A is an agricultural tractor, and B is a rotary cultivating device showing an example of a working machine that is attached to and detached from the rear part of the agricultural tractor A. On the rear surface of the rear mission case 1 of the agricultural tractor A, a power take-off shaft 2 is projectingly provided,
Lift arms 4 are pivotally supported on both sides of a hydraulic case 3 provided on the upper surface thereof. A hitch frame 5 includes an arch-shaped main frame 6, an upper hook plate 7 fixed to an upper portion of the main frame 6, a connecting shaft 8 and a clutch 9 provided in a lower central portion, It is composed of a lower connecting plate 10 fixed to the lower end and the like, and the power take-off shaft 2 and the connecting shaft 8 are interlockingly connected by a yoke joint 11. Reference numeral 12 denotes a bracket projectingly provided on the rear surface of the hydraulic case 3, the bracket 12 and the upper hook plate 7 being connected via a top link 13, and the front end portion thereof being connected to both lower sides of the rear mission case 1. The rear end of the lower link 14 is connected to the lower connecting plate 10 via a connecting pin 15. Therefore, the lift arm 4
By moving the lower link 14 up and down via a lift rod (not shown), the hitch frame 5 and the lower connecting plate 10 are moved up and down. The lower connecting plate 10 is formed with a concave engaging groove 17 with which a lower connecting pin 16 provided on the working machine B side, which will be described later, engages. The lower hook plate 19 that is movably supported is formed with an engaging groove 20 that engages with the lower connecting pin 16 from above, and the lower hook plate 19 and the lower connecting plate 10 have lower connecting pins 16 respectively. A corresponding through hole is bored in the state of engaging with each other, and the lock pin 21 fitted in the through hole is interlocked with the operation lever 23 via the connecting rod 22. Thus, the lower connecting plate 10, the lower hook plate 19 and the lower connecting pin 16 on the working machine B side constitute the lower hook portion 24.

On the other hand, the rotary tiller shown as an example of the working machine B is
The rotary tiller without a tail wheel or with a tail wheel removed is constructed as follows.
That is, the main frame 25 is provided with connecting plates 26 extending from both sides thereof toward the front, the connecting pins 16 are projectingly provided on the connecting plates 26, and the top mast 27 erected at the central portion is provided. An upper connecting plate 28 extends forward, and an upper connecting pin 29 on which the upper hook plate 7 on the agricultural tractor A side engages and disengages at the front end portion of the upper connecting plate 28.
Is projected. Thus, the top hook portion 30 is constituted by the upper hook plate 7 on the agricultural tractor A side, the upper connecting plate 28 and the upper connecting pin 29 on the working machine B side.

Further, a clutch 32 having an input shaft 31 is fixedly provided at a central portion of the main frame 25, a rotary 34 is rotatably supported by a lower end portion of a transmission case 33, and a cultivator is provided above the rotary 34. A cover 35 is attached, and a tool bar 37 formed of a square pipe is attached to the rear end of a support frame 36 whose front end is pivotally supported by the main frame 25 so as to be vertically tiltable. Through holes 38, 39 are formed at 37 in the up-down direction at a predetermined interval.

Reference numeral 40 denotes a holding stand that is fixed to the tool bar 37 when the work implement B is attached and detached, and the stand 40 is capable of swinging back and forth within a certain range with respect to the support plate 41 attached to the rear part of the tool bar 37. It is composed of a pipe 42. That is, the support plate 41 is a rectangular support plate 43 in contact with the lower surface of the tool bar 37, a connecting rod 44 standingly fixed to the portion in contact with the lower surface, and a U-shaped plan view fixed to the outer periphery of the support plate 43. The cover body 45 includes a connecting rod 44 of the support plate 43 and through holes 38, 3 of the toolbar 37.
When the support plate 41 is attached to the tool bar 37 by inserting the snap pin 46 into the connecting rod 44 from below, the front end 47 of the cover body 45 comes into contact with the rear surface of the tool bar 37. There is.

A load seat 48 of the working machine B is fixedly installed at an upper portion of the pipe 42. The load seat 48 is formed of a rectangular flat plate, and both left and right edges of the load seat 48 contact the inner surface of the cover body 45. It is like this. Further, an L-shaped ground plate 49 is formed at the lower end of the pipe 42 so as to extend in a direction orthogonal to the front-rear direction of the agricultural tractor A. The ground plate 49 may be formed integrally with the pipe 42, or may be formed of a separate material and fixed by means such as welding. Then, the pipe 42 configured in this way is inserted from below into the floating hole 50 formed in the support plate 43, and the split pin 52 is inserted into the through hole 51 formed in the upper end portion of the support plate 41. It is mounted so that it can swing back and forth within a certain range. Between the split pin 52 and the support plate 41, a washer 53, a compression ammunition 54, and an ammunition bearing 55 of the same size and size as the load bearing 48 of the working machine B are inserted and inserted in the pipe 42. There is. 56 is the inner rear surface of the cover body 45 and the support plate 41.
It is a gap formed between the trailing edge and the rear edge for draining water.

In the above-described embodiment, the compression ammunition 54 is positioned between the split pin 52 inserted into the upper end of the pipe 42 and the support plate 41, and is inserted through the pipe 42.
As shown in FIGS. 8 and 9, 54 is positioned between the lower surface of the tool bar 37 and the washer 53 supported by the snap pin 46 inserted in the vertical middle portion of the pipe 42 so that it is positioned on the pipe 42. The pipe 42 may be configured to be slidable in the vertical direction with respect to the work machine B by being inserted and inserted, and by fixing the pipe 42 to the tool bar 37, the tool bar 37 is vertically swung with respect to the pipe 42. This may be possible, and in these cases, it is possible to reduce the load on the pipe 42 when the work implement B is attached and detached.

In the above embodiment, the drainage gap 56 is formed between the inner surface of the rear portion of the cover body 45 and the rear edge of the support plate 41. However, the drainage gap 56 is shown in FIG. like,
A hole 57 may be provided in a portion of the bottom of the L-shaped ground plate 49 that contacts the lower end of the pipe 42, and the hole 57 may be used for draining water.

In the above configuration, when the work implement B is to be disengaged from the hitch frame 5, the stand 40 attached to the tool bar 37 in the retracted posture as shown in FIG. As shown in FIG.
After mounting the grounding plate 49 so that the grounding plate 49 is grounded in a direction orthogonal to the front-back direction of the agricultural tractor A, the operating lever 23 is tilted to unlock the work machine B and the hitch frame 5. When the stand 40 is lowered, the stand 40 first comes into contact with the ground, and at that moment, the stand 40 receives the drop impact of the working machine B. However, the ground plate of the stand 40
49 is grounded in a direction orthogonal to the front-rear direction of the tractor A, and both side edges of the load seat 48 of the working machine B are in contact with the inner surface of the cover body 45 fixed to the outer periphery of the support plate 41 attached to the tool bar 37. Therefore, the rotation of the stand 40 is prevented, and the front end portion 47 of the cover body 45 is in contact with the rear surface of the tool bar 37. Therefore, the rotation of the support plate 41 is also prevented. Even if it receives the impact of falling, the work machine B can be held in a predetermined posture by reliably restricting the sideways falling. Therefore, when the working machine B is further lowered, the working machine B is not twisted with respect to the tractor A and the top hook portion 30 is not twisted, and the working machine B is lowered as shown in FIG. As shown in the drawing, the lower connecting pin 16 on the working machine B side is pulled out from the engaging groove 17 of the lower connecting plate 10 on the tractor A side, and the lower hook plate 19 is retracted in the process. Following this, it rotates counterclockwise, the stand 40 is guided by the free hole 50 formed in the support plate 41 while resisting the compression ammunition 54, and tilts backward as shown in FIG. Support B comfortably. If the hitch frame 5 is lowered from this state,
Since the upper hook plate 7 separates from the upper connecting pin 29, when the tractor A is moved forward, the working machine B moves to the 7th position.
The hitch frame 5 is disengaged in the state shown in the figure.

When the working machine B is connected to the hitch frame 5, the operating lever 23 is released from the lock position and the tractor A is retracted to move the upper hook plate 7 to the upper connecting pin 29 on the working machine B side.
When the work machine B is lifted by engaging with the
With the fulcrum as a fulcrum, the lower connecting pin 16 enters the engaging groove 17 of the lower connecting plate 10, and accordingly, the lower hook plate 19 rotates clockwise to engage with the lower connecting pin 16. At the same time, the lock pin 21 is locked. At the same time, the coupling shaft 8 on the tractor A side enters the center hole of the clutch 32 on the working machine B side and is aligned, and the clutch 9 on the tractor A side and the clutch 32 on the working machine B side mesh with each other. It is ready for transmission.

In the above series of work machine connection processes, the stand 40 is prevented from rotating as described above, and the support plate 41 is also prevented from rotating. Therefore, when the work machine B is lifted, the stand 40 and the work machine B are Of the work machine B is held in a predetermined posture by the stand 40, the work machine B and the stand 40 integrally rotate and fall sideways when connected. It is avoided that the center of gravity of the working machine B deviates from the line connecting the grounding points of the top hook portion 30 and the stand 40 and the lower hook portion 24 is displaced, and the working machine B is securely connected to the hitch frame 5. It

[Effect of device]

In short, the present invention is a stand for holding a working machine in a predetermined posture, which is attached to and detached from a hitch frame connected to a rear portion of a tractor through a top link and a lower link, and the stand is attached to a toolbar of the working machine. It consists of a support plate and a pipe that can swing back and forth within a certain range with respect to the support plate, and the front end of the support plate is in contact with the rear surface of the tool bar and the inner surface is fixed to the pipe. A cover body that is in contact with both side edges of the load seat to prevent the pipe from falling sideways is integrally formed, and at the lower end portion of the pipe, a ground plate is extendedly formed in a direction orthogonal to the front-rear direction of the tractor. When the work implement is detached, the stand attached to the tool bar operates so that the ground plate installed at the lower end of the pipe in the direction orthogonal to the front-rear direction touches the ground and retracts with the detachment. Machine can be supported without difficulty by rearward inclination to the pipe at a certain range. And since both side edges of the load seat are in contact with the inner surface of the cover body that is in contact with the rear end of the toolbar, the sideways fall of the stand is reliably controlled to prevent the work machine from twisting with respect to the tractor, and the top hook part is not twisted. It is possible to avoid disengagement of the work machine due to the work machine, and when connecting the work machine, surely regulate the horizontal fall of the stand and the work machine, and the work machine cannot be connected due to the position shift of the lower hook part. It is possible to eliminate all of the above problems, and it is possible to always attach and detach the working machine quickly and accurately, which is a very useful practical effect.

[Brief description of drawings]

FIG. 1 shows an embodiment of a holding stand for a working machine for a tractor according to the present invention. FIG. 1 (A) is a plan view showing a usage state of the stand, FIG. FIG. 2C is a rear view of the same, FIG. 2A is a plan view showing a housed state of the stand, FIG. 2B is a side view of the same, and FIG. 3 is a view showing a connection state of the tractor and the working machine. Plan view of section 4,
Figures 7 to 7 are side views for explaining the operation, FIG. 8 (A) is a plan view of another example showing the usage state of the stand, FIG. 8 (B) is the same side view as above, and FIG. Same as the rear view, FIG. 9 is a rear view of another example showing the storage state of the stand, and FIG. 10 (A) is a plan view showing another example of the ground plate of the stand.
The same figure (B) is the same front view, and the same figure (C) is a side view. A: agricultural tractor, B: work machine, 5: hitch frame,
13 …… Top link, 14 …… Lower link, 24 …… Lower hook part, 30 …… Top hook part, 37 …… Toolbar, 40
…… Stand, 41 …… Support plate, 42 …… Pipe, 45
...... Cover body, 48 …… Load receiving seat, 49 …… Grounding plate

Claims (1)

[Scope of utility model registration request] 1. A stand for holding, in a predetermined posture, a working machine that is attached to and detached from a hitch frame connected to a rear portion of a tractor via a top link and a lower link, and the stand is a support plate attached to a toolbar of the working machine. And a pipe that can swing back and forth with respect to the support plate within a certain range. The front end of the support plate is in contact with the rear surface of the tool bar, and the inner surface is fixed to the pipe. A cover body that is in contact with both side edges of the seat to prevent the pipe from falling sideways is integrally formed, and a ground plate is formed at a lower end portion of the pipe so as to extend in a direction orthogonal to the front-rear direction of the tractor. Holding stand for work equipment for tractors.