JP3872208B2 - Farm machine folding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the center part in the length direction is mounted on the rear part of the tractor via a three-point link hitch mechanism so that the center part can be moved up and down, and the work machine parts extending to the left and right sides of the center part are folded to the center part side The present invention relates to a folding device for an agricultural machine that can be operated easily and has an improved locking mechanism.
[0002]
[Prior art]
Conventionally, the center part in the length direction of the agricultural machine is mounted on the rear part of the tractor via a three-point link hitch mechanism so as to be movable up and down, and the power is transmitted from the tractor to the central part of the agricultural machine. 2. Description of the Related Art Agricultural work machines are well known in which work machine parts extending from the center part to the left and right sides can be folded to the center part side in order to shorten the lateral length of the machine body.
[0003]
And as a method of folding the left and right work machine parts with respect to the center part,
(1). Folding and extending the left and right work implement parts using hydraulic cylinders.
(2). A spring with a large compression / extension force interposed between the left and right work implement parts and the center part.
(3). Two springs for urging the left and right work implement portions in the unfolding direction and the folding direction are provided between the left and right work implement portions and the central portion.
(Four). Two locking members are provided between the left and right work machine parts and the center part, which are respectively locked when the left and right work machine parts are in the expanded state and the folded state.
Such means are known.
[0004]
[Problems to be solved by the invention]
Above (1). In this case, the weight increases and the price increases. (2). In this case, a large spring is required, which is heavy and expensive. (3). In this case, two springs are required between the left and right work machine parts and the central part. (Four). In this case, there is a problem that it is necessary to lock the left and right work machine parts when they are in the expanded state and the folded state, and to unlock them when they are rotated.
[0005]
In the present invention, the farm work machine is divided into a center part and left and right work machine parts, and the left and right end parts of the center part and the inner end parts of the left and right work machine parts can be rotated approximately 180 ° by respective rotation fulcrums. Agricultural machines connected to can be rotated manually with a light operating force without using a hydraulic cylinder, etc. , and the work equipment can be changed to the expanded / folded state, and the work equipment is automatically locked. The object of the present invention is to solve the above-mentioned conventional problems by enabling the unlocking operation with one touch.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention attaches the central part of the agricultural machine in the longitudinal direction to the rear part of the tractor via a three-point link hitch mechanism so as to be able to move up and down, and power is supplied from the tractor to the central part of the agricultural machine. And transmitting the work machine part extending from the central part to the left and right sides with respect to the central part. The farm work machine can be folded to the central part side. And the left and right end portions of the central portion and the inner end portions of the left and right work implement portions are connected to each other by a rotation fulcrum so that the center portion and the left and right work implement portions are rotatable. is interposed compression spring member between said compression spring member, when the working machine part of the left and right is rotated about said rotational fulcrum, working machine parts of the left and right working position or folding Most contracted when the location, the left and right working machine parts the compression spring member in the middle rotation is characterized by the most extended while over rotation fulcrum.
[0007]
[Action]
By the above means, the folding device for agricultural machines of the present invention operates as follows.
That is, since a hydraulic cylinder or the like is not used, it is light and inexpensive, has a good weight balance when the agricultural machine is mounted on the tractor, and can be used even with a small tractor.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. In FIG. 5 to FIG. 9, reference numeral 1 is a cutting harrow having a long length in the left-right direction (3770 mm in this embodiment) and having a crushing and cutting function. Although not shown in the drawing, the front portion of the substitute harrow 1 is provided with a connecting portion 2 to the tractor, which is connected to a known three-point link hitch mechanism comprising a top link and a lower link of the tractor. 1 is attached to the rear part of the tractor so as to be movable up and down. In addition, power is transmitted from the PTO shaft of the tractor via the input shaft 3a to the transmission gear box 3 provided at the front center portion of the scraping harrow 1 via a universal joint, a transmission shaft, and the like.
[0009]
The blank hello 1 is divided into a central part 4 (length = 1900 mm) and left and right working machine parts 5L and 5R (length = 930 mm each), and the left and right end parts of the central part 4 and the left and right working machines The inner ends of the portions 5L and 5R are connected to each other by rotation shafts (rotation fulcrums) 6 and 6 so as to be rotatable by about 180 °, respectively, and the rear surface 4a of the central portion 4 and the rear surfaces 5La and Folding is possible by overlapping 5Ra. As shown in the drawing, the lengths of the left and right working machine parts 5L and 5R with respect to the length of the central part 4 are approximately halved. Since the work machine parts 5L and 5R are symmetrical and have the same configuration, only one work machine part 5L will be described.
[0010]
On both the left and right sides of the gear box 3, there are provided transmission frames 8, 8a that also serve as a main body frame and are internally provided with transmission shafts 7, 7a. Chain transmission cases 9 are suspended from the transmission frames 8 and 8a at the central portion 4 at the rear of the tractor tire T and at the outer ends of the work implement portions 5L and 5R. ing. A rotary shaft 11 is mounted between a lower end portion of each chain transmission case 9 and a lower end portion of a support frame 10 that is suspended from the transmission frames 8 and 8a so as to face the chain transmission case 9. A large number of crushed soil / claw claw 12 is attached to the circumference of the rotary shaft 11 to constitute a crushed soil / cutter rotor 13.
[0011]
A dog clutch 14 is provided at a portion where the shaft ends of the transmission shafts 7 and 7a face each other. When the entire harrow 1 shown in FIG. The dog clutch 14 is disengaged when the portions 5L and 5R are rotated about the rotation shaft 6 and folded on the central portion 4. The upper portion of the crushed soil / rotator rotor 13 is covered by a shield cover 15 supported by the main body frame, and an apron 16 pivotally supporting a leveler 17 at the rear end position is provided at the rear end portion of the shield cover 15. The upper end portion is pivotally attached so as to be rotatable in the vertical direction. The folding opposing portions of the leveler 17 are connected by a hinge 18 that rotates about an axis substantially equal to the axis of the rotary shaft 6. Further, the leveler 17 can be displaced to a leveling position for leveling the soil and a leveling position for scraping the soil.
[0012]
As shown in FIGS. 1 to 4, a lock pin support plate 19 having a first lock pin 19 a is fixed to the transmission frame 8 at the folding rotation portion of the work machine portion 5 </ b> L, and corresponds to the support plate 19. The first hook 20 is pivotally supported by the shaft 20a on the transmission frame 8a side. The first hook 20 includes a hook hole 20b that fits and detaches from the first lock pin 19a, a cam-like sliding contact surface 20c that comes into sliding contact with the first lock pin 19a immediately before locking, and the first hook 20. An operating lever 20d that rotates and a rotating arm 20e that rotates together with the first hook 20 are provided.
[0013]
A second hook 21 is pivotally supported by a shaft 21a on a plate 5Lf fixed to the work machine portion 5L. The second hook 21 also has the same structure as the first hook 20, and has a hook hole 21 b that fits and detaches from the second lock pin 22, and a slidable contact surface 21 c that slidably contacts the second lock pin 22. Is provided. The second lock pin 22 is provided on a plate 4 b fixed to the central portion 4. Then, the turning arm 20e of the first hook 20 and the second hook 21 are connected by a link rod 23 made of an elastic rod, and when the first hook 20 is rotated by holding the operation lever 20d, The second hook 21 is also rotated in the same manner.
[0014]
Further, the first hook 20 is operated to operate the operation lever 20d to release the fitting between the first hook 20 or the second hook 21 and the first lock pin 19a or the second lock pin 22. When the first hook 20 and the second hook 21 are held in the unlocked posture, and then the operation lever 20d is operated to place the first hook 20 and the second hook 21 in the lock standby posture, A toggle spring 24 is provided to hold the posture. Immediately before the work implement portion 5L rotates to the working posture or the folding posture, the sliding contact surface 20c of the first hook 20 in the lock standby posture is in contact with the first lock pin 19a or the second lock pin 19a. The slidable contact surface 21c of the hook 21 is slidably contacted with the second lock pin 22, and the first hook 20 or the second hook 21 is rotated so as to slightly return against the resilient force of the toggle spring 24. The hook hole 20b or the hook hole 20b is automatically fitted and locked with the first lock pin 19a or the second lock pin 22 and held in that state.
[0015]
When the left and right work machine parts 5L and 5R are rotated around the rotation fulcrum 6 between the central part 4 and the work machine part 5L, that is, between the transmission frame 8 and the plate 5Lf, the left and right work A gas spring 25 (which may be a compression spring) that is most contracted when the machine parts 5L and 5R are at the working position or the folding position and is most extended when the machine parts 5L and 5R are on the rotation fulcrum 6 is interposed. When the left and right work machine parts 5L and 5R are rotated upward from the work position, the lifting force is reduced by the extending action of the gas spring 25, and the work machine part that has been rotated to the upper position is further rotated to the folding position side. The gas spring 25 is rotated slowly by the repulsive force of the gas spring 25 and is set to the folding position, so that it can be rotated lightly even in manual operation .
[0016]
As described above, according to the agricultural machinery folding apparatus according to the embodiment of the present invention, the following effects can be achieved by the above-described means.
[0017]
The farm work machine is divided into a center part and left and right work machine parts, and the left and right end parts of the center part and the inner end parts of the left and right work machine parts are connected to each other by a rotation fulcrum so as to be rotatable by approximately 180 ° When the left and right work machine parts are rotated around the rotation fulcrum between the center part and the left and right work machine parts, the left and right work machine parts are most contracted and rotated when they are in the working position or the folding position. When the compression spring member that is most extended when it is on the fulcrum is interposed, it can be configured at a low cost without using a hydraulic cylinder or a large spring, and when the farm work machine is mounted on a tractor In addition, the weight balance is improved, and even a tractor with a small horsepower can be used.
[0018]
Two locking members that are locked when the left and right work implement parts are in the working position or the folding position and are manually unlocked when the left and right work implement parts are rotated around the rotation fulcrum are pivotally supported. The lock member is connected by a link rod and urged by a spring so that it automatically locks when the left and right work implement parts are in the work position or the folding position, so when switching the left and right work machine parts to the work position or the folding position, the lock The device can be easily released with a single touch and with a light operating force. Since the lock member is automatically locked at the working position or the folding position, anyone can operate it safely.
[0019]
Further, when a gas spring is used as the compression spring member, when the working machine part is in the working position or the folded position, it is in a contracted state, and no rust is generated in the spring part.
[Brief description of the drawings]
FIG. 1 is a partial plan view showing a working machine portion of a folding mechanism according to the present invention in a working position.
FIG. 2 is a partial plan view in the middle of rotating the working machine part.
FIG. 3 is a partial plan view of the working machine portion in a folding position.
FIG. 4 is a partial plan view immediately before the lock member is automatically locked.
FIG. 5 is a schematic rear view of the entire folding-type cutting harrow according to the present invention.
6 is a schematic side view from the direction A in FIG. 5;
FIG. 7 is a schematic side view showing a state in which the blank hello is folded.
8 is a schematic plan view from the direction B in FIG. 7;
FIG. 9 is a partial plan view of an alternative harrow according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 generation | occurrence | production scratch hello 2 connection part to tractor 3 speed change gear box 3a input shaft 4 center part of generation scratch hello 4a back of center part 4b plate 5L left work machine part 5R right work machine part 5La back of left work machine part 5Ra right Back of work machine part 5Lf Plate 6 Rotating shaft (Rotating fulcrum)
7, 7a Transmission shaft 8 Transmission frame 9 Chain transmission case 10 Support frame 11 Rotary shaft 12 Crushed soil / claw claw 13 Crushed soil / claw rotor 14 Dog clutch 15 Shield cover 16 Apron 17 Leveler 18 Hinge 19 Lock pin support plate 19a First lock pin 20 First hook 20a Shaft 20b Hook hole 20c Sliding contact surface with lock pin 20d Operation lever 20e Rotating arm 21 Second hook 21a Shaft 21b Hook hole 21c Sliding contact surface with lock pin 22 Second Lock pin 23 Link rod 24 Toggle spring 25 Gas spring T Tractor tire

Claims (1)

At the rear part of the tractor, a central part in the length direction of the agricultural machine is mounted through a three-point link hitch mechanism so as to be movable up and down, and power is transmitted from the tractor to the central part of the agricultural machine. In the agricultural machine that can fold the work machine part extending from the part to the left and right sides to the center part side,
The farm work machine is divided into a center part and left and right work machine parts, and the left and right end parts of the center part and the inner end parts of the left and right work machine parts are connected to each other so as to be rotatable by about 180 ° by a rotation fulcrum. In addition, a compression spring member is interposed between the center portion and the left and right work machine portions ,
When the left and right work implement parts are rotated around the rotation fulcrum, the compression spring member contracts most when the left and right work implement parts are in the working position or the folding position, and the left and right work implement parts are in the middle of rotation. A folding device for agricultural machines, wherein the compression spring member extends most when it is on a rotation fulcrum .

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