JP2820344B2 - Dual plow connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin plow coupling device,
It mainly relates to connecting an automatic reversing double plow to a tractor.

[0002]

2. Description of the Related Art Conventionally, as this type of double plow, for example, the configuration described in Japanese Patent Publication No. 57-39123 is known. In this configuration, the connecting frame of the twin plow is connected to the top link and the tip of the lower link of the tractor, and the twin machine is provided with a double plow and a reversing switching mechanism for reversing the double plow. An operating bracket is rotatably supported by the connecting machine frame in a vertically rotatable manner with a support shaft, and an interlocking rod of the reversing switching mechanism is connected to one end of the operating bracket, and the other end of the operating bracket is connected to the connecting bracket. Is connected to one end of a chain via a coil spring, and the other end of the chain is locked to a locking body protruding from a rear portion of the tractor body, so that the top link and the lower link of the tractor can be raised and lowered. As the connecting frame of the twin plow is raised by the movement, the operating bracket is pulled by the chain and the coil spring and is rotated vertically about the support shaft, and the interlocking rod is moved back and forth, and , With this interlocking rod Operation has been bi for plow body switch is adapted to be switched to the right inverted or left inversion.

There is also known a configuration in which a mounting bracket long in the front-rear direction for mounting the chain is detachably mounted with a plurality of bolts and nuts on a differential in a rear portion of a tractor body.

[0004]

In the structure described in the above publication, a chain is stretched between a locking member protruding from a rear portion of a tractor body and an operation fitting provided on a connecting machine frame. Therefore, this chain is used for the power take-off shaft (PT
O-axis), the PTO shaft may be rubbed and damaged by the chain during the switching reversal operation of the twin plow. It may be difficult to connect the power transmission shaft for transmitting power to the tractor body, and if the locking body is projected from the rear of the tractor body, the locking body may be moved relative to the PTO shaft. It becomes an obstacle when connecting the transmission shaft, it takes time to remove the locking body at the time of the connection work, and furthermore, since the top link is attached to the fixed position at the top of the tractor body,
There is a problem that the ground height of the mounting position of the top link cannot be variably adjusted, and therefore the twin plow cannot be easily connected to various tractors.

In a configuration in which a mounting bracket is detachably mounted on a differential of a rear portion of the tractor body, the mounting bracket is long in the front-rear direction. There is a problem in that it becomes an obstacle when connecting the two, and it takes time to remove the mounting brackets in the connection work.

In view of the above, the present invention has been made in view of such a point, and the chain is rubbed against the PTO shaft when the double plow is switched and turned over by the top link and the mounting bracket for mounting the chain. The power transmission shaft for transmitting the output of the PTO shaft to the work body can be easily connected to the PTO shaft, and there is no need to project a locking body for attaching a chain to the tractor. The mounting bracket can be connected in a stable state without laterally moving to the connecting part of various tractors, and the chain can be pulled in a well-balanced position with this mounting bracket. It is an object of the present invention to provide a dual plow connection device capable of smoothly operating an operation fitting for switching and reversing.

[0007]

SUMMARY OF THE INVENTION A dual plow coupling device of the present invention includes a tractor having a top link and a lower link;
A twin plow provided with a twin plow and a reversing switching mechanism for inverting the double plow in a coupling frame connected to the top link and the lower link of the tractor; An operating bracket rotatably supported in the up-down direction and having one end connected to the interlocking rod of the reversing switching mechanism, and a base end of the top link attached to the tractor main body and rotatably attached to an upper portion thereof And a mounting bracket for extending a chain between the other end of the operating bracket at the bottom and the tractor body. A plurality of insertion holes through which connection pins are inserted are formed on the upper and lower sides of the connection plate so as to face each other, and the mounting bracket has a connection substrate connected between the left and right connection plates. Upper mounting part for pivotally attaching the base end of the link A lower mounting portion is formed at a lower portion of the lower mounting portion, the lower mounting portion protruding rearward, and a communication hole communicating with the upper and lower insertion holes and a communication elongated hole extending in the vertical direction are formed on the connection board. Are formed up and down, and a circular hole having a diameter larger than the width of the communication long hole is formed at the end of the communication long hole to communicate with the left and right connecting plates with a cross-sectional shape that can be inserted into and removed from the circular hole. And has a length located at
An outer peripheral portion has a spacer having an annular concave portion that engages with the communication long hole and a through hole that penetrates the connection pin in a length direction.

[0008]

According to the dual plow connecting device of the present invention, a spacer having a size that can be inserted between the left and right connecting plates according to the interval between the left and right connecting plates fixed to the upper part of the tractor body is provided. The spacer is inserted into a circular hole that is continuous with the vertically long communicating long hole formed in the connecting substrate, and the annular concave portion of the spacer is engaged with the edge of the circular hole to support the spacer at the edge.

Next, the connecting board of the mounting bracket is inserted and arranged between the left and right connecting plates, and one of the upper and lower communicating holes of the connecting board and the spacer are inserted from the selected upper and lower through holes of the one connecting plate. A connecting pin is inserted into the through hole and the upper and lower through holes of the other connecting plate, and the connecting board of the mounting bracket is connected between the left and right connecting plates by the upper and lower connecting pins. With the connection of the connection board, both ends of the spacer through which the connection pin is inserted are disposed between the left and right connection plates, and the connection board is positioned by the spacer, and the mounting bracket moves in the axial direction of the connection pin. Is prevented.

At this time, that is, when inserting the connecting pin into the through hole of the spacer, if the positions of the through holes of the left and right connecting plates do not match the positions of the through holes of the spacer, the spacer is inserted into the circular hole. With the annular recess engaged with the edge of the communicating long hole following the circular hole from the position, the spacer is pushed up along this edge and the position of the through hole of the spacer matches the position of the insertion hole of the left and right connecting plates Then, the connecting pin is inserted into these insertion holes and through holes. Therefore, the mounting bracket can be attached to various tractors having different intervals between the left and right connecting plates and different intervals between the upper and lower through holes by the communication elongated holes and the spacers having the circular holes of the connecting substrate.

Next, the base end of the top link is connected to the upper mounting portion of the mounting bracket so as to be rotatable in the vertical direction. To be rotatable in the direction. Further, the distal ends of the left and right lower links, which are connected to the lower left and right of the tractor main body so as to be rotatable vertically, are connected to the lower left and right of the connecting frame of the twin plow so as to be rotatable vertically. In addition, a chain is stretched between a lower mounting portion of the mounting bracket and an end of the operating bracket pivotally supported by the connecting machine frame. Therefore, by mounting the mounting bracket between the left and right connecting plates of the tractor body, the base end of the top link is mounted,
The chain is easily stretched between the operating bracket and the double plow is easily connected to the tractor.

[0012] The connecting frame of the twin plow is raised by the upward rotation of the top link and the left and right lower links of the tractor, whereby the operating bracket is pulled by the chain and moves vertically about the support shaft. While being rotated, the interlocking rod is moved back and forth, and the reversing switching mechanism is switched by the interlocking rod, so that the dual plow is switched between right inversion and left inversion. At this time, the end of the chain is attached to the lower mounting portion protruding toward the rear of the mounting bracket, so that the chain will not be damaged by rubbing the PTO shaft of the tractor, The mounting bracket is prevented from moving in the axial direction of the connecting pin, and the operating bracket is vertically rotated in a stable state via the chain by the mounting bracket in a stable state.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In the drawing, reference numeral 1 denotes a double plow.
Has a connecting machine frame 2, a plurality of double plows 3 are provided in the front and rear direction on the connecting machine frame 2, and each of the double plows 3 is switched between right inversion and left inversion and is inverted. A reverse switching mechanism 4 is provided. The connecting machine frame 2 has a connecting pin 5 provided at the upper end thereof so as to be freely inserted and removed in the left-right direction, and lower pins 6 protruding outward at the left and right lower ends, respectively. A channel-shaped base frame 7 is provided at an upper portion, and a bell-crank-shaped operating bracket 8 is located between the base frame 7 and the connection pin 5 so as to be rotatable in a vertical direction on a support shaft 9. Supported.

A front end of an interlocking rod 10 of the reversing switching mechanism 4 is provided at one end of the operating bracket 8 with a support shaft 11 and a support shaft 11a.
The other end is locked with one end of a coil spring 12, and the other end is locked with one end of a chain 13. Have been. Front ends of left and right parallel support arms 14 which are long in the front-rear direction are respectively mounted on the base frame 7 so as to be rotatable in a horizontal direction about a vertical axis 15. Removable fixing pin 16 protruding from frame 7
Is fixed so as not to rotate.

A connecting main frame 17 is attached to the rear ends of the left and right support arms 14 so as to be rotatable in a horizontal direction by connecting pins 18 and a main shaft 19. A substantially middle portion of the parallelogram frame 20 which is long in the front-rear direction is supported via the connection pin 18 and the main shaft 19, and the connection pin 18 is disposed on a side frame 20a on one side in the left-right direction of the parallelogram frame 20. The main shaft 19 is fixed to a side frame 20b on the other side of the parallelogram frame 20.

A front frame 21, a rear frame 22 and an intermediate frame 23 are formed at a front end, a rear end and an intermediate portion of the parallelogram frame 20, respectively. Double plow 3a, the rear frame 22 is the rear double plow 3b,
The intermediate plow 3c of the intermediate portion is attached to the intermediate frame 23, and the double plow 3c of the intermediate portion and the dual plow 3 of the rear portion are attached to the double plow 3a of the front side. The plows 3b are sequentially displaced in the left-right direction, and these dual plows 3a, 3b,
In each plow of 3c, the cultivated soil is tillage-turned over three rows at a time. Thus, each of the dual plows 3a,
Each of the plows 3b and 3c is switched between right and left inversions by the rotation of the main shaft 19 which is rotated by the switching operation of the inversion switching mechanism 4.

Further, the reversing switching mechanism 4 includes the main spindle.
A substantially fan-shaped spindle metal fitting 24 fixed to the upper end of 19, a guide groove formed on one side of the spindle metal fitting 24, which is rotatably supported by the rear end of the support arm 14 in the front-rear direction. A stopper 25 inserted in the guide groove, and a spring for urging the stopper 25 to be always engaged in the left and right locking recesses of the guide groove.
26, a floating metal member 27 rotatably supported in a horizontal direction on the upper part of the main shaft metal member 24, and a stopper recess provided on the lower part of the floating metal member 27 so as to be able to advance and retreat, and the stopper 25 against the spring 26. A stopper press fitting 28 for releasing engagement with the stopper push fitting 28, and projecting upward from an upper portion of the stopper press fitting 28 through a long guide groove formed in the floating fitting 27 in the front-rear direction. A protruding rod 29 having a rear end rotatably mounted on a shaft, a tension spring 30 for constantly urging the stopper pressing member 28 rearward, and a rotatable shaft supported by the other side of the main shaft 24. A spring latch 32 having a tension spring 31 stretched between the stopper pressing bracket 28 and the front end of the stopper pressing bracket 28 is provided.

Next, reference numeral 33 denotes a tractor.
A bracket 35 is integrally fixed to the upper rear end of the tractor body 34, and a plurality of insertion holes 37 are provided at upper and lower portions of the left and right connecting plates 36 which are long in the vertical direction of the bracket 35.
Are provided to face each other. Further, a connecting piece 38 is integrally provided on the left and right portions of the tractor body 34 at a position below the bracket 35, and the left and right connecting pieces are provided.
A base end of a lower link 39 is rotatably mounted on a support shaft 40 so that the base end of the lower link 39 is rotatable in a vertical direction. Is rotatably mounted on the shaft. Further, a PTO shaft (not shown) is rotatably protruded from a substantially middle portion of the rear end of the tractor body 34.

Reference numeral 41 denotes a mounting bracket.
Has a vertically long connecting board 42 disposed between the left and right connecting boards 36 of the bracket 35, and the upper and lower ends of the connecting board 42 have upper and lower ends of the left and right connecting boards 36. A communication hole 43 communicating with the upper and lower insertion holes 37 formed in the portion is formed. A vertically long communication hole 44 communicating with the insertion hole 37 formed in the middle part of the left and right connection plates 36 is provided in the connection board 42 between the communication holes 43 in the upper and lower portions. A circular hole 45 having a diameter larger than the width of the communication elongated hole 44 is formed continuously at the lower end of the communication elongated hole 44. Then, the connection pins 46 are respectively inserted into at least two selected insertion holes 37 above and below the left and right connection plates 36 and the upper and lower communication holes 43 or the communication holes 43 and the communication long holes 44 of the connection board 42. The connection board 42 is connected between the left and right connection plates 36 by the upper and lower connection pins 46.

A U-shaped connecting metal fitting 47 as an upper mounting portion is integrally fixed to the rear end upper portion of the connecting board 42, and the upper and lower mounting plates 48 on the left and right sides of the connecting metal fitting 47 are opposed to each other. Are provided with mounting holes 49 facing left and right. The base end of the top link 50 is located between the left and right mounting plates 48.
A base end portion 50a of the top link 50 is rotatably mounted in a vertical direction by a connecting pin 51 inserted between one of the upper and lower mounting holes 49 opposed to each other. The distal end of the top link 50 is pivotally mounted on the connecting pin 5 at the upper end of the connecting machine frame 2 so as to be vertically rotatable.
Further, a mounting rod 52 as a lower mounting portion is integrally protruded rearward and downward from a lower end of a rear end of the connection board 42, and a hook 53 is integrally fixed to a rear end of the mounting rod 52.
The other end of the chain 13 is detachably attached to 53.

Further, a spacer 54 is removably inserted into a vertically long communication hole 44 from a circular hole 45 formed in an intermediate portion of the connection board 42. The spacer 54 has a cross-sectional shape that can be inserted into and removed from the circular hole 45 and has a length located between the left and right connecting plates 36. Further, on the outer peripheral portion of the intermediate portion in the length direction of the spacer 54, the opening edge portion of the communicating long hole 44 which is long in the vertical direction is opposed.
An annular recess 55 engaging with 44a is formed, and a through-hole 56 penetrating the connecting pin 46 is formed at the center in the longitudinal direction. A plurality of spacers 54 having a length that can be inserted in close proximity to any of the left and right connecting plates 36 of the bracket 35 of the various tractors 33 at different intervals are prepared.

Next, the operation of the above embodiment will be described.

When connecting the twin plow 1 to the tractor 33, the bracket 35 fixed to the upper part of the tractor body 34 can be inserted between the left and right connecting plates 36 according to the distance between the left and right connecting plates 36. A spacer 54 having a size is selected, and the selected spacer 54 is inserted into a circular hole 45 that is continuous with a vertically long communication long hole 44 formed in the connection board 42 of the mounting bracket 41, and the spacer 54 is also inserted. The annular concave portion 55 is engaged with the opening edge 45a of the circular hole 45, and the spacer 54 is
To support.

Next, the connecting board 42 of the mounting bracket 41 is inserted and arranged between the left and right connecting boards 36, and the upper and lower ones of the connecting board 42 are inserted through the selected upper and lower through holes 37 of the one connecting board 36. The connecting pin 46 is inserted into the through hole 56 of the spacer 54, the through hole 56 of the spacer 54, and the upper and lower through holes 37 of the other connecting plate 36, and the upper and lower connecting pins 46 are used to mount the mounting bracket 41 between the left and right connecting plates 36. Are connected. By the connection of the connection board 42, both ends of the spacer 54 into which the connection pins 46 are inserted are disposed in a state of being close to each other between the left and right connection plates 36, and the spacer 54
Is positioned, and the mounting bracket 41 is prevented from moving in the axial direction of the connecting pin 46, the mounting rod 52 below the mounting bracket 41 is prevented from moving in the left and right directions, and the traction efficiency of the chain 13 is reduced. It is possible to prevent the chain 13 from becoming bad or the balance pulling the chain 13 from being lost.

At this time, that is, the through hole 56 of the spacer 54
If the position of the insertion hole 37 of the left and right connection plates 36 does not match the position of the through hole 56 of the spacer 54 when the connection pin 46 is inserted into the inside, the spacer 54 is moved from the position of the hole 45 to the hole 45. After the annular concave portion 55 is engaged with the opening edge 44a of the communication long hole 44, the spacer 54 is pushed up along the opening edge 44a, and the position of the through hole 56 of the spacer 54 is adjusted by the left and right connecting plates 36. The connecting pin 46 is inserted into the insertion hole 37 and the through hole 56 so as to match the position of the insertion hole 37. Therefore, the left and right connecting plates are formed by the communicating long holes 44 having the circular holes 45 of the connecting substrate 42 and the spacers 54.
The mounting bracket 41 can be mounted on various tractors 33 having different intervals between 36 and upper and lower insertion holes 37.

Next, a top link 50 is provided between the left and right mounting plates 48 of the connection fitting 47 fixed to the upper rear end of the connection board 42.
A base end portion 50a is provided, and a mounting hole 49 at one of the selected upper and lower positions of the mounting plate 48 and a top link
The connecting pin 51 is inserted through the base end 50a of the
The base end 50a of the top link 50 is vertically rotatably connected between the left and right mounting plates 48, and the upper end of the connecting frame 2 of the twin plow 1 is attached to the tip of the top link 50. The connecting pins 5 are connected so as to be rotatable vertically. In addition, the distal ends of the left and right lower links 39 whose base ends are rotatably connected to the lower left and right connecting pieces 38 of the tractor body 34 with the support shaft 40 in the vertical direction are connected to the connecting frame 2 of the twin plow 1. The lower pin 6 protruding left and right is connected to the lower pin 6 so as to be rotatable vertically.

A coil spring 12 is interposed between a hook 53 of a mounting rod 52 protruding rearward and downward of the mounting bracket 41 and an end of an operating bracket 8 pivotally supported by the connecting machine frame 2. The chain 13 is stretched. Therefore, by attaching the mounting bracket 41 to the bracket 35 of the tractor body 34, the ground height at the connecting position of the top link 50 is easily set to an appropriate position, and the chain 13 is easily stretched between the operating bracket 8 and the top link 50. And the twin plow 1 is easily connected to the tractor 33.

When the top frame 50 of the tractor 33 and the left and right lower links 39 are raised and raised, the connecting machine frame 2 of the twin plow 1 is raised, so that the operating bracket 8 is moved by the coil spring 12 and the chain 13. The linking lever 10 is pulled up and down and pivoted about the support shaft 9, the interlocking rod 10 is moved back and forth, and the interlocking rod 10 switches the inversion switching mechanism 4. The parallelogram frame 20 is actuated by the rotation of the main shaft 19 of the
3a, 3b, and 3c are switched to right inversion or left inversion in the same direction. At this time, the end of the chain 13 is connected to a hook 53 at the rear end of a mounting rod 52 protruding rearward of the mounting bracket 41.
Since the chain 13 is attached to the tractor 33, the chain 13 is stretched at a position largely separated rearward from the PTO shaft of the tractor 33. Therefore, the chain 13 is switched when the dual plows 3a, 3b, 3c are switched over. Does not damage the PTO shaft of the tractor 33.

[0030]

According to the present invention, the upper mounting portion for mounting the base end of the top link between the left and right connecting plates fixed to the upper portion of the tractor body and the rearward for mounting the end of the chain. Since the connecting board of the mounting bracket having the protruding lower mounting portion is connected by the connecting pin, the twin plow can be easily connected to various tractors by this mounting bracket, and the lower part of the mounting bracket Since the mounting portion protrudes rearward, the chain stretched between the lower mounting portion and the operating bracket pivotally supported by the connecting frame of the twin plow is connected to the P of the tractor.
It can be installed at a position away from the TO shaft, so that the chain will not be damaged by rubbing the PTO shaft with the chain during the reversing operation of the twin plow, and the tractor must be provided with a locking body for attaching the chain to the tractor. There is no need to remove the locking body when connecting the power transmission shaft to the PTO shaft, and a vertically long communication hole is formed in the connection substrate of the mounting bracket. A circular hole is formed at the end of the circular hole, and the circular hole is inserted into and removed from the circular hole, and has an annular concave portion that engages with the long communicating hole and a through hole that penetrates the coupling pin, and between the left and right coupling plates. Since the spacer of the length located in is provided,
By this spacer, the mounting bracket can be connected in a stable state without laterally moving between the connecting plates of various tractors having different intervals between the left and right connecting plates and between the upper and lower through holes of the connecting plate. With this mounting bracket, the chain can be pulled in a well-balanced manner at a fixed position, and the operating bracket for switching and reversing the twin plow can be smoothly operated.

[Brief description of the drawings]

FIG. 1 is a side view of a twin plow connecting apparatus showing one embodiment of the present invention.

FIG. 2 is a side view showing a connection state of the mounting bracket.

FIG. 3 is a cross-sectional view taken along line a-a in FIG.

FIG. 4 is a side view showing the detached state of the mounting bracket.

FIG. 5 is a sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double plow 2 Coupler frame 3 Double plow 4 Inversion switching mechanism 8 Operating bracket 10 Interlocking rod 13 Chain 33 Tractor 34 Tractor body 36 Connection plate 37 Insertion hole 39 Lower link 41 Mounting bracket 42 Connection board 43 Communication hole 44 Communication Elongated hole 45 Circular hole 46 Connecting pin 47 Upper mounting part 50 Top link 52 Lower mounting part 54 Spacer 55 Annular concave part 56 Through hole

Claims (1)

(57) [Claims] 1. A tractor having a top link and a lower link, and a twin plow and a reversing switching mechanism for reversing the dual plow are provided on a connecting machine frame of the tractor connected to the top link and the lower link. A twin plow, an operating bracket rotatably supported in the up and down direction on the connecting machine frame of the twin plow to connect an interlocking rod of the reversing switching mechanism to one end, and an upper part attached to the tractor main body; A mounting bracket for rotatably attaching a base end of the top link to the other end of the operating bracket at the lower portion, and a tractor body at an upper portion. The left and right connecting plates facing each other are integrally fixed, and a plurality of insertion holes through which connecting pins are inserted are formed on the left and right of the left and right connecting plates so as to face each other. The mounting bracket is connected between the left and right connecting plates. Having a connecting board to Forming an upper mounting portion for rotatably mounting a base end portion of the top link on the portion, and a lower mounting portion for mounting an end portion of the chain at a lower portion thereof, protruding rearward, A communication hole communicating with the upper and lower insertion holes and a communication long hole elongated in the up-down direction are formed in the connection board, and a circular hole having a diameter larger than the width of the communication long hole is formed at the end of the communication long hole. A cross-sectional shape that can be inserted into and removed from the circular hole, a length positioned between the left and right connecting plates, and an outer peripheral portion having an annular concave portion that engages with the communication long hole; And a spacer having a through-hole penetrating the connecting pin in a vertical direction.