JPH065401U - Folding tiller - Google Patents

Abstract

(57) [Summary] [Purpose] A long tilling work machine such as a rotary crushing and scraping device, which is mounted on the rear part of a tractor via a three-point link mechanism, has a transmission system that extends from the gear box to the left and right sides. (EN) A foldable tilling work machine having a lock mechanism, in which a working device part including the work device can be folded toward the rear of the machine body. [Structure] Between the both sides of the central part of the working machine and the folding working device part, a locking mechanism is provided which automatically locks the working device part when the working device part is unfolded into a working state and releases the lock when the working device part is folded. This lock mechanism is linked and linked to the left and right so that when one lock is released, the other lock is also released. The lock mechanism is provided with a return lever for returning the lock mechanism in the unlocked state to the locked state when the working device is rotated from the deployed state to the folded state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a working device part including a transmission system extending from the gear box to the left and right sides of a long tilling work machine such as a rotary crushing / scraping device mounted on the rear part of a tractor through a three-point link mechanism. The present invention relates to a foldable field tiller equipped with an automatic lock mechanism, as well as to be folded toward the rear of the machine body.

[0002]

[Prior art]

 Conventionally, a long tiller was installed on the left and right like a rotary crusher / scraper at the rear of the tractor via a three-point link mechanism, and power was transmitted from the PTO shaft of the tractor to the gearbox of the tiller. In order to avoid obstacles when moving, the foldable cultivator is designed so that the working device part including the transmission system extending from the gear box to the left and right sides can be folded toward the rear of the machine from both the left and right sides of the central part including the gear box. Working machines are known, for example, from Japanese Utility Model Laid-Open No. 63-143106, Japanese Utility Model Laid-Open No. 1-163907, Japanese Utility Model Laid-Open No. 2-12208, and the like. And in these cultivated tillers, a locking mechanism is provided between the left and right sides of the central part and the folding working device.

[0003]

[Problems to be solved by the device]

 By the way, the left and right lock mechanisms operate separately.For this reason, for example, when releasing the lock, release one of the lock mechanisms in front of the tractor or the work equipment. It was necessary to go around the back and release the other one, which was troublesome. Further, when changing from the unlocked state to the locked state, it is necessary to operate the right and left separately as in the case of releasing the lock, which is troublesome. The present invention has been made to solve the above problems.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention provides (1) a cultivating implement mounted on a rear part of a tractor via a three-point link mechanism, and a cultivating implement from the PTO shaft of the tractor. Folding tiller, which is designed to transmit power to the gearbox of the gearbox and to fold the work equipment part including the transmission system extending from the gearbox to the left and right sides from the left and right sides of the center part including the gearbox toward the rear of the machine. In this case, a lock mechanism is provided between both sides of the central part and the work device part to be folded, which automatically locks the work device part when the work device part is deployed to the working state and releases the lock when the work device part is folded. As for the lock mechanism, the left and right things are interlocked and linked so that when one lock is released, the other lock is also released. Each is characterized by having a return lever for returning the lock mechanism in the unlocked state to the locked state when the minute is rotated from the unfolded state to the folded state.

[0005]

[Action]

 The foldable tiller according to the present invention having the above-described structure is configured to automatically lock the working device portion between the both sides of the central portion and the working device portion to be folded when the working device portion is expanded to the working state, and to fold the working device portion. Sometimes a lock mechanism is provided to unlock the lock, and the left and right locks are linked and linked so that when one lock is released, the other lock is also released. The mechanism can be released at the same time, and the lock release operation can be performed in a short time. The lock mechanism is provided with a return lever that returns the lock mechanism that is in the unlocked state to the locked state when the working device section is rotated from the expanded state to the folded state. It is automatically locked by the lock mechanism when it is rotated to the deployed state, and no lock operation is required.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, reference numeral 1 is a rotary type tilling machine having a long length in the left-right direction and having a function of crushing and scraping, and a well-known front tractor including a top link and a lower link of a tractor (not shown). A connecting portion 2 to a tractor connected to the three-point link mechanism is provided so that the tractor can be mounted on the rear portion of the tractor so as to be able to move up and down. In addition, power is transmitted from the PTO shaft of the tractor to the gear box 3 of the tiller 1 through a universal joint, a transmission shaft, etc., via an input shaft (not shown).

Working device portions 5 and 5 including transmission systems 4 and 4 extending from the gear box 3 to the left and right sides are linked by link rods 7 from both left and right sides of a central portion 6 including the gear box 3. It is rotated by 90 degrees in the front-rear direction about the hinges 8 and 8 by human power, and is displaced between a working state in which it is developed in the left-right direction and a folded state in which it is folded toward the rear of the machine. Then, between the left and right side portions of the central portion 6 of the front part of the machine body and the work device portions 5, 5, the work device portions 5, 5 are automatically locked when the work device portions 5, 5 are deployed in the working state, and the work device portions 5, 5 are locked. A work state lock mechanism 9 is provided to release the lock manually when folding.

As shown in FIGS. 4 and 5, the working state lock mechanism 9 has lock pins 10 and 11 mounted on the working device portions 5 and 5 side, and shafts 12 and 13 on the central portion 6 side. Pivotally supported engagement hooks 14 and 15 are provided so that they can be engaged (locked) and disengaged (unlocked). The operating lever 16 is fixed to the engaging hook 14, and the connecting arms 17 and 18 are coaxially fixed to the engaging hooks 14 and 15, respectively, and the connecting arms 17 and 18 are connected by a connecting rod 19. The connecting rod 19 penetrates through the pipe frame 6b which connects the vertical frames 6a of the central portion 6 and 6a in the horizontal direction. Further, a toggle spring 20 composed of a torsion spring is installed between the engaging hook 14 and the central portion 6, and the engaging hook 15 is provided with an automatic return lever 21.

The working state lock mechanism 9 engages with the lock pins 10a and 11a that move as shown in FIG. 4 when the working device portions 5 and 5 are deployed to the working state (FIGS. 1 and 2). By sliding along the inclined surfaces (cam surfaces) 14a, 15a of the hooks 14, 15, the engaging hook 14 is pushed up against the elastic force of the toggle spring 20 within a range not exceeding the dead point O, At the same time, the engaging hook 15 is pushed down and rotated to automatically lock. When folding the working device parts 5 and 5, the operating lever 16 is held and rotated to the imaginary line of FIG. 4, that is, the state of FIG. 5 against the elastic force of the toggle spring 20. Then, as the engaging hook 14 and the connecting arm 17 rotate, the engaging hook 15 rotates via the connecting rod 19 and the connecting arm 18, and the lock pins 10 and 11 are unlocked. 20 exceeds the dead point O and holds the engagement hooks 14 and 15 in the unlocked state.

When the engagement hooks 14 and 15 are unlocked, the lock pin 11 is engaged with the automatic return lever 21, and when the work device parts 5 and 5 are folded in this state. , The lock pins 10 and 11 respectively move in the directions of the arrows, the automatic return lever 21 is pushed up and the engaging hook 15 rotates, the connecting arm 18 and the connecting rod 19 rotate, and the toggle spring 20 reaches the dead point. When O is exceeded, the work state lock mechanism 9 is returned to the state shown in FIG. 4, that is, the lock state (lock standby state). The toggle spring 20 is set such that, while the operation lever 16 is rotated by 45 degrees, 30 degrees is elastically held in a locked state and 15 degrees is elastically held in an unlocked state.

Corresponding to the link rod 7 which is moved by the turning motion when folding the working device portions 5, 5, as shown in FIGS. 6 to 8, the central portion 6 and the working portion 5 are folded as shown in FIG. Between the working device parts 5 and 5, the working device parts 5 and 5 are automatically locked when the working device parts 5 and 5 are folded 90 degrees from the unfolded state to the folded state, and the working device parts 5 and 5 are folded to the folded state of FIG. 1 to FIG. 2 and the work state shown in FIGS. 1 and 2, the folding state lock mechanism 22 is configured so that the lock is released manually and the work device portions 5 and 5 are unfolded to return to the locked state. It is provided.

The folding state lock mechanism 22 pivotally supports the engagement hook 24 on the central portion 6 by a shaft 23, and engages (locks) the engagement hook 24 with a lock pin 25 attached to the link rod 7. It is provided so that it can be unlocked (unlocked). An operation lever 26 is fixed to the engaging hook 24, and a toggle spring 27, which is a torsion spring, is provided between the engaging hook 24 and the central portion 6. Further, an inclined surface (cam surface) is formed on the engaging hook 24, an automatic return lever 28 is attached, and a contact pin 29 is provided on the link rod 7.

Then, the folding state lock mechanism 22 folds the working device portions 5 and 5 from the unfolded state (FIGS. 1 and 2) to the working state and rotates 90 degrees to the folded state (FIG. 3). The pivot rod moves the link rod 7 and the lock pin 25, and the lock pin 25 slides along the inclined surface (cam surface) 24a of the engagement hook 24 to move the engagement hook 24 of the toggle spring 27. It pushes up within the range that does not exceed the dead point O against the resilience and automatically locks (state of FIG. 6). Further, when the working device portions 5, 5 are deployed to the working state, the operating lever 26 is held and rotated to the state shown in FIG. 8 against the elastic force of the toggle spring 27. Then, the locked state of the engagement hook 24 and the lock pin 25 is released, the toggle spring 20 crosses the dead point O in the middle of the process, and holds the engagement hook 24 in the unlocked state.

When the engagement hook 24 is in the unlocked state, the automatic return lever 21 is in contact with the contact pin 29. In this state, when the working device portions 5 and 5 are rotated to the working state, the link rod 7 And the lock pin 25 moves. By this movement, the automatic return lever 21 is sequentially pushed up by the contact pin 29 to rotate the engagement hook 24, the toggle spring 27 goes beyond the dead point O, and the folding state lock mechanism 22 is moved to the state shown in FIG. That is, the lock state (lock standby state) is restored. As with the toggle spring 20, the toggle spring 27 is set so that, while the operation lever 26 rotates 45 degrees, 30 degrees is held in a locked state and 15 degrees is held in an unlocked state. ing.

With the working device parts 5, 5 of the tiller implement 1 deployed in the working condition shown in FIGS. 1 and 2, the central part 6 and the rear end parts of the working device parts 5, 5 have As shown in FIG. 9, a flat plate 30 is provided so as to be divided into two in the lengthwise direction, and both flat plates 30 have a three-dimensional notch having a bulge in the front-rear direction over the entire lengthwise direction thereof. A large number of 31, 31, ... Are formed at predetermined intervals. In addition, the notch for draining water in the conventional flat plate was a plane notch. For this reason, during the scraping work, the water and mud to be leveled were protruding to the side of the level plate.

When the three-dimensional cutouts 31, 31, ... Are formed in the flat plate 30 as described above, when the plowing work is performed by the tilling work machine 1, as shown in FIG. The surface of the field is leveled so that water and mud collected in the inside of 5, especially on the front side of the flat plate 30 escape rearward from the three-dimensional cutouts 31, 31. Therefore, the leveling performance is improved without water and mud like the conventional leveling plate protruding from the side of the leveling plate and having to perform the leveling operation many times. The flat plate 30 and the three-dimensional cutouts 31, 31 ... Are not limited to the folding type tilling machine as in the present embodiment, but can be similarly applied to a non-folding type.

When the working device portions 5 and 5 are rotated 90 degrees in the front-rear direction about the hinge portions 8 and 8 to be in a working state and a folding state, transmission systems 4 and 4 extending from the gear box 3 to the left and right sides. Dog clutches 32 and 33 are provided in the device, and the clutch engagement / disengagement operation is automatically performed by the rotation of the work device parts 5 and 5. At this time, in the folded state as shown in FIG. 3, when moving in the field by the tractor, mud repelled by the tire of the tractor may enter the dog clutch 33. Therefore, in the present invention, in conjunction with the pivotal movement of the working device portions 5, 5, the dog clutch 33 is covered in the folded state, and the covers 34, 34 are arranged to be removed in the working state. .

As shown in FIGS. 11 to 13, the cover 34 is fixed to the eccentric support arm 35 and rotatably supported by the support cylinder 36. The cover 34 has a pivot contact pin 37 at the tip of the eccentric support arm 35. Is provided, and the rotation contact pin 37 is brought into contact with the contact portion 38 formed on the hinge portion 8. Further, the cover 34 covers the dog clutch 33 when it is lowered by the weight of the cover 34 itself due to the eccentricity of the eccentric support arm 35 as shown in FIG. The cover is released when the eccentric support arm 35 is rotated by being pushed by.

When the working device portions 5 and 5 are rotated in the front-rear direction about the hinge portions 8 and 8 to be in the working state of FIG. 1, the cover 34 is contacted by the rotation contact pin 37. It is pushed by the contact portion 38, the eccentric support arm 35 is rotated so as to lift the cover 34, and the dog clutch 33 is not covered. Further, when the working device parts 5, 5 are in the folded state as shown in FIG. 3, the rotary contact pin 37 is not pushed by the contact part 38, and the cover 34 descends by its own weight. It rotates to the state and covers the dog clutch 33. Therefore, it is possible to prevent the mud from entering the dog clutch 33. Reference numeral 39 is a connecting rope for stably connecting the rear end portions when the working device portions 5 and 5 are folded as shown in FIG.

[0020]

[Effect of device]

 As described above, according to the folding type tiller of the present invention, the following effects can be obtained. A lock mechanism is provided between both sides of the center part of the tilling implement and the work device part to be folded, which automatically locks when the work device part is deployed to the working state and releases the lock when the work device part is folded. Since the left and right locks are linked and linked so that when one lock is released, the other lock is also released, the left and right lock mechanisms can be released simultaneously on one side of the tiller. Therefore, the lock release operation can be easily performed in a short time. The lock mechanism is equipped with a return lever that returns the lock mechanism that is in the unlocked state to the locked state when the work device is rotated from the deployed state to the folded state, so that the lock mechanism automatically enters the lock standby state. Therefore, the work mechanism can be automatically locked by the lock mechanism simply by unfolding the working device from the folded state to the working state, and the working device can be easily unfolded and folded.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a working device portion of a tillage implement according to the present invention is expanded to a working state.

FIG. 2 is a rear view of the same partial cross section.

FIG. 3 is a plan view of a state in which the work device portion is folded.

FIG. 4 is a plan view of a work state lock mechanism for locking the work device portion in a work state in a locked state.

FIG. 5 is a plan view showing a state in which the work state lock mechanism is unlocked.

FIG. 6 is a side view of the folding lock mechanism that locks the work device portion in a folded state in a locked state.

FIG. 7 is a bottom view of the same portion.

FIG. 8 is a side view showing a state where the lock of the folding lock mechanism is released.

FIG. 9 is a perspective view of a flat plate portion.

FIG. 10 is an explanatory view of the same operation.

FIG. 11 is a plan view of the power transmission unit cover device in a covered state.

FIG. 12 is an explanatory diagram of the same operation.

FIG. 13 is a front view of the power transmission unit cover device in a covered state.

[Explanation of symbols]

1 Tillage implement 2 Connection part to tractor 3 Gear box 4 Transmission system 5 Working device part 6 Central part 6a Vertical frame 6b Frame pipe 7 Link rod 8 Hinge part 9 Working state lock mechanism 10, 11 Lock pin 10a, 11a Move Lock pins 12, 13, 23 Shafts 14, 15, 24 Engaging hooks 14a, 15a, 24a Inclined surface (cam surface) 16, 26 Operating lever 17, 18 Connecting arm 19 Connecting rod 20, 27 Toggle spring 21, 29 Automatic return Lever 22 Folded state lock mechanism 30 Flat plate 31 Three-dimensional notch 32, 33 Dog clutch 34 Clutch cover 35 Centering support arm 36 Support tube 37 Rotating contact pin 38 Contact part 39 Connecting rope

Claims (2)

[Scope of utility model registration request] 1. A cultivator implement is mounted on a rear portion of a tractor via a three-point link mechanism, and power is transmitted from a PTO shaft of the tractor to a gearbox of the cultivator, and a transmission extending from the gearbox to both left and right sides. In the foldable tillage work machine, which is configured to fold the working device part including the system from the left and right sides of the central part including the gear box toward the rear of the machine body, between the both side parts of the central part and the working device part to be folded, A lock mechanism is provided that automatically locks the work device when it is unfolded into a working state, and unlocks it when the work device is folded.This lock mechanism allows the other lock to be released when one lock is released. Folding tiller, characterized by connecting and connecting left and right things. 2. The lock mechanism is provided with a return lever for returning the lock mechanism in the unlocked state to the locked state when the working device portion is rotated from the deployed state to the folded state. Item 1. A foldable field tiller according to item 1.