JP7145614B2 - combine - Google Patents

Description

The present invention provides a threshing device for threshing harvested grain culms, which includes a device body supported by a body frame and an open state in which the device body is supported to swing around a horizontal axis at the top of the device body and the top is opened upward. and a top plate capable of swinging between a closed state and a top plate that closes the upper portion.

For example, in Patent Document 1, a threshing device (reference numeral "6" in the document) for threshing harvested grain culms has a device main body supported by a body frame (reference numeral "1") and a device main body supported on the upper part of the device main body. A combine harvester is disclosed which is equipped with a top plate (reference number “111” in the document) and a top plate. The top plate in Patent Literature 1 is supported by a threshing device via a hinge so as to be swingable about a horizontal axis. Further, in Patent Document 2, a threshing device (reference numeral "9" in the document) for threshing harvested grain culms includes a device main body and a top plate ("release side cover 36a" in the document) supported on the upper part of the device main body. and a combine is disclosed. The top plate in Patent Document 2 is supported on the upper part of the device main body so as to be swingable around a horizontal axis, and is swingable between an open state in which the upper portion is opened upward and a closed state in which the upper portion is closed.

JP 2017-055706 A (Fig. 2) Japanese Patent Application Laid-Open No. 2011-250750 (Figs. 5 and 6)

By the way, in order to keep the top plate disclosed in Patent Documents 1 and 2 in a closed state, the top plate is generally bolted at a plurality of points. With this configuration, the closed state of the top plate is reliably held. requires a lot of man-hours and is troublesome.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a combine harvester in which the top plate is reliably held in a closed state and the troublesomeness of maintenance and inspection of the threshing device is reduced.

The combine of the present invention is
A threshing device for threshing harvested grain culms includes a device main body supported by a body frame, an open state in which the upper portion is opened upward, and the upper portion supported by the upper portion of the device main body so as to be swingable about a horizontal axis. and a lock mechanism capable of holding the position of the top plate in the closed state,
The lock mechanism includes a first engaging portion provided on one of the top plate and the apparatus main body and engageable with the first engaging portion provided on the other of the top plate and the apparatus main body. and a second engaging portion,
A holding mechanism capable of holding an engaged state in which the first engaging portion and the second engaging portion are engaged,
The first engaging portion is configured to be switchable between an engaging position in which it can engage with the second engaging portion and a first retracted position in which it does not engage with the second engaging portion,
The first engaging portion is provided with a biasing mechanism that biases the first engaging portion toward the engaging position,
The holding mechanism is configured to be switchable between a holding position capable of holding the engaged state and a second retracted position not holding the engaged state,
When the top plate moves in the direction of the closed state, the pressing force of the second engaging portion acts on the first engaging portion, and the first engaging portion becomes the first retracted position. Further, when the top plate moves in the direction of the closed state, the first engaging portion is brought to the engaging position by the biasing force of the biasing mechanism, and the first engaging portion and the second The two engaging portions are engaged,
When the top plate moves in the direction of the closed state, the pressing force of the second engaging portion acts on the holding mechanism, and the holding mechanism moves to the second retracted position. After the top plate moves in the direction of the closed state and the first engaging portion and the second engaging portion are engaged, the holding mechanism assumes the holding position and holds the engaged state. characterized by

According to the present invention, the locking mechanism is provided with the first engaging portion and the second engaging portion, and the top plate is held in the closed state by the engagement between the first engaging portion and the second engaging portion, By releasing the engagement between the first engaging portion and the second engaging portion, the top plate is allowed to swing. In other words, when opening and closing the top plate during maintenance and inspection of the threshing apparatus, it is only necessary to engage or disengage the first engaging portion and the second engaging portion. be. Further, in the present invention, the engagement of the first engaging portion and the second engaging portion is reliably held by the holding mechanism, so that the closed state of the top plate is reliably held. As a result, it is possible to realize a combine harvester in which the closed state of the top plate is reliably maintained and the troublesomeness of maintenance and inspection of the threshing device is reduced.

Further, with this configuration, even if the top plate moves to the closed state side and the first engaging portion and the second engaging portion interfere with each other, the top plate moves to the closed state side as it is. The first engaging portion is switched to the first retracted position side only by pressing the button. Further, even if the top plate moves to the closed state side and the holding mechanism and the second engaging portion interfere with each other, the holding mechanism can be retracted to the second retraction simply by moving the top plate to the closed state side. position. As a result, there is no need to switch the first engaging portion to the first retracted position in advance, or to switch the holding mechanism to the second retracted position in advance, and the inconvenience caused when the top plate moves to the closed state side is eliminated. mitigated. Furthermore, since the first engaging portion is urged toward the engaging position side by the urging mechanism, when the top plate is closed, the first engaging portion and the second engaging portion are engaged to move the top. The plate is held closed. As a result, the lock mechanism can hold the top plate in the closed state with a simple operation.

Moreover, the combine of the present invention is
A threshing device for threshing harvested grain culms includes a device main body supported by a body frame, an open state in which the upper portion is opened upward, and the upper portion supported by the upper portion of the device main body so as to be swingable about a horizontal axis. and a lock mechanism capable of holding the position of the top plate in the closed state,
The lock mechanism includes a first engaging portion provided on one of the top plate and the apparatus main body and engageable with the first engaging portion provided on the other of the top plate and the apparatus main body. and a second engaging portion,
A holding mechanism capable of holding an engaged state in which the first engaging portion and the second engaging portion are engaged,
The first engaging portion is configured to be switchable between an engaging position in which it can engage with the second engaging portion and a first retracted position in which it does not engage with the second engaging portion,
The holding mechanism is configured to be switchable between a holding position capable of holding the engaged state and a second retracted position not holding the engaged state,
When the top plate moves in the direction of the closed state and the pressing force of the second engaging portion acts on the first engaging portion, the first engaging portion switches to the first retracted position side. configured to be
When the top plate moves in the direction of the closed state and the pressing force of the second engaging portion acts on the holding mechanism, the holding mechanism is switched to the second retracted position side,
The first engaging portion is provided with a biasing mechanism that biases the first engaging portion toward the engaging position,
The first engaging portion includes a first swinging member swingably supported by one of the top plate and the device main body,
The holding mechanism is provided with a second swinging member swingably supported on a side of the top plate and the device main body on which the first swinging member is provided,
the first swing member is provided with a first cam capable of coming into contact with the second engaging portion;
the second swing member is provided with a second cam capable of coming into contact with the second engaging portion;
The first swinging member is configured to swing toward the first retracted position when a pressing force of the second engaging portion acts on the first cam,
The second swinging member is configured to swing toward the second retracted position when a pressing force of the second engaging portion acts on the second cam.

According to the present invention, switching between the engaging position and the first retracted position of the first engaging portion is realized by swinging the first swinging member, and switching between the holding position and the second retracted position of the holding mechanism is realized. is realized by the oscillation of the second oscillation member. Further, since each of the first cam and the second cam is capable of coming into contact with the second engaging portion, the first swinging member swings toward the first retracted position, and the second swinging member swings toward the first retracted position. to the second retracted position side are realized by a simple configuration.

In the present invention,
It is preferable that the second swinging member is swingably supported by the first swinging member.

With this configuration, the second rocking member is supported by the first rocking member, so that the second rocking member cannot move with respect to the first rocking member. Therefore, the first swing member and the second swing member are integrally configured, and a compact structure can be achieved compared to a structure in which the second swing member is supported by something other than the first swing member. Become. In addition, even if a force for swinging toward the first retracted position acts on the first swing member while the holding mechanism maintains the engaged state of the first engaging portion and the second engaging portion. , the reaction force on the engagement position side acts on the first rocking member more reliably via the second rocking member.

In the present invention,
A driving unit is provided in front of the threshing device, a grain tank is provided behind the driving unit and on the side of the threshing device, and the top plate is located on the side opposite to the side where the grain tank is located. It is configured to swing to the outside of the fuselage,
A plurality of the lock mechanisms are arranged in the front-rear direction on the side of the threshing device on the side where the grain tank is located,
a link mechanism that spans across the plurality of lock mechanisms and interlocks the plurality of lock mechanisms; It is preferable if a possible operating tool is provided.

According to this configuration, since a plurality of locking mechanisms are provided side by side in the front-rear direction, it is possible to hold the closed state of the top plate more firmly than in the case where there is only one locking mechanism. In addition, since a plurality of lock mechanisms are interlocked by a link mechanism, and the operation tool is provided in the foremost lock mechanism located near the front side of the threshing device, the operation tool is arranged in front of the threshing device and the grain tank. becomes easier. For this reason, compared to the case where the operating tool is provided in a lock mechanism other than the lock mechanism at the foremost end, it is easier to arrange the operating tool in a wider space, and it is easier to arrange the operating tool so that it can be operated from the operation unit. Become.

In the present invention,
A stay for attaching the second engaging portion is erected at an end of the top plate,
It is preferable that the first engaging portion extends upward from the upper end of the device main body.

The locking mechanism is provided on the side of the threshing device on the side where the grain tank is located. Therefore, if the first engaging portion and the second engaging portion are arranged in the gap between the threshing device and the grain tank, the lock mechanism may be difficult to see from the driving portion. With this configuration, since the first engaging portion and the second engaging portion are provided at a position as high as possible from the upper end of the device main body, the first engaging portion and the second engaging portion are used in the threshing device and the grain tank. It becomes easy to be visually recognized without blocking the field of view. In addition, in this configuration, compared to the case where the first engaging portion and the second engaging portion are arranged in the gap between the threshing device and the grain tank, the first engaging portion and the second engaging portion are It is provided in a wide space, and the fear of interfering with other devices and members is reduced.

In the present invention,
It is preferable that the first engaging portion is a hook, the second engaging portion is a pin, and the holding mechanism can close the opening of the hook so that the pin does not come off.

With this configuration, the lock mechanism is realized by a simple configuration of the pin and the hook, and the holding mechanism is realized by a simple configuration of closing the opening of the hook. In this configuration, the state in which the opening of the hook is closed includes not only the state in which the entire hook opening is closed, but also the state in which the opening of the hook is partially closed so that the pin does not come off.

In the present invention,
It is preferable that the hook is provided on the device main body and the pin is provided on the top plate.

With this configuration, the configuration of the top plate becomes simpler than the configuration in which the top plate is provided with hooks. Also, with this configuration, compared to a configuration in which the top plate is provided with hooks, the tip is less likely to get caught on other members or the like, and the top plate can be swung smoothly.

It is a left view of a combine. It is a top view of a combine. It is a top view which shows the top plate and dust-sending valve of a threshing apparatus. It is a front view which shows opening and closing of the top plate of a threshing apparatus. It is a right view which shows the lock mechanism of a threshing apparatus. It is an enlarged right side view showing a lock mechanism and a holding mechanism. FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism; FIG. 4 is an explanatory diagram showing operations of a lock mechanism and a holding mechanism;

A mode for carrying out the present invention will be described based on the drawings. In the following description, the direction of arrow F shown in FIG. The direction of arrow L is defined as the "left side of the machine body", and the direction to the right of the direction of arrow F, that is, the direction of arrow R shown in FIG. 2 is defined as the "right side of the machine body".

[Overall configuration of combine harvester]
1 and 2 show a common combine harvester corresponding to the "combine harvester" of the present invention. The combine is provided with a body frame 1 and a crawler traveling device 2. - 特許庁A reaping part 3 for reaping planted grain culms is provided in front of the machine body. A harvesting part 3 is provided with a raking reel 4 for raking planted grain culms, a cutting blade 5 for cutting planted grain culms, and a raking auger 6 for raking the harvested grain culms.

A driving unit 7 is provided on the right side of the front part of the aircraft, and the driving unit 7 has a cabin for driving. A grain tank 8 for storing grains after threshing is provided behind the driving unit 7 . A threshing device 9 for threshing the reaping grain culms is provided on the left side of the grain tank 8 . A feeder 10 for conveying harvested grain culms toward the threshing device 9 is provided across the reaping unit 3 and the threshing device 9 . A grain discharging device 11 for discharging the grains in the grain tank 8 to the outside is provided. The grain discharging device 11 is provided with a vertical conveying section 11A and a horizontal conveying section 11B. A lower end portion of the vertical transport portion 11A is connected to the grain tank 8 for communication. The horizontal conveying section 11B is connected to the upper end portion of the vertical conveying section 11A so as to be vertically swingable. At the rear of the threshing device 9, a waste straw processing device 12 for shredding the waste straw after threshing processing by the threshing device 9 is provided. The grain tank 8 is configured to be able to swing around the vertical conveying section 11A. The tank 8 inclines with respect to the longitudinal direction of the fuselage. In this state, a space is secured on the right side of the body of the threshing device 9, and the operator can perform maintenance of the threshing device 9 from this space.

A threshing device 9 is formed with a threshing chamber, and a threshing cylinder 13 is provided in the threshing chamber. The handling cylinder 13 is rotatable around an axis extending in the longitudinal direction of the machine body. The handling cylinder 13 has a scraping portion 13A provided in the front portion of the handling cylinder 13 and a scraping processing portion 13B provided behind the scraping portion 13A. A receiving net 14 is provided below the handling cylinder 13 . Under the threshing device 9, a rocking sorting device 15 that sifts and sorts the sorting objects while transferring them to the rear of the machine body, a winnow 16 that blows sorting air to the rocking sorting device 15, and the first grain (single grain) There are provided a first recovery section 17 for recovering hardened grains, etc., and a second recovery section 18 for recovering secondary grains (eg, grains with branch stems). This constitutes the device main body 9W of the threshing device 9 in this embodiment.

[Top plate of thresher]
As shown in FIGS. 3 and 4 , the upper part of the threshing chamber is covered with a top plate 20 over the front and rear of the threshing device 9 . The left side of the top plate 20, that is, the lateral outer side of the machine body, is connected to the left side wall 9L of the threshing device 9 via a plurality of hinges 20L. The plurality of hinges 20L are arranged on the left side wall portion 9L along the horizontal axis X extending in the front-rear direction and aligned in the front-rear direction. Thereby, the top plate 20 is configured to be swingable around the horizontal axis X (around the horizontal axis) with respect to the left side wall portion 9L via the hinge 20L. The top plate 20 has a closed state (a state indicated by a two-dot chain line in FIG. 4) that covers the upper part of the handling cylinder 13, an open state that opens the upper part of the handling cylinder 13, and is configured to be switchable to

A top plate 20 is provided with a grip portion 21 and a gas damper 22. - 特許庁The grip portions 21 are provided at the front and rear ends of the right side of the top plate 20, that is, the side opposite to the side where the hinge 20L is located, and the operator operates the top plate 20 to swing. It's the part you grab to do. The operator can swing the top plate 20 by operating one of the front and rear grip portions 21 , 21 . The gas dampers 22 are provided at the front and rear ends of the top plate 20, respectively. A gas damper 22 provided at the front end of the top plate 20 is connected to the front wall portion 20F of the top plate 20 and the front wall portion 9F of the threshing device 9 so as to be swingable. A gas damper 22 provided at the rear end of the top plate 20 is connected to the rear wall portion 20B of the top plate 20 and the rear wall portion 9B of the threshing device 9 so as to be swingable. Each of the gas dampers 22, 22 expands and contracts with the rocking motion of the top plate 20, and is configured to be able to maintain the open state of the top plate 20 when the top plate 20 is not rocked. It is

As shown in FIG. 3, a first dust valve 23 and a plurality of second dust valves 24 are provided inside the top plate 20, that is, on the side where the handling cylinder 13 is located. The first dust-sending valve 23 is provided above the raking portion 13A in a non-movable and non-swingable state. The plurality of second dust feed valves 24 are provided above the scraping processing section 13B so as to be arranged in a row along the rotation axis of the scraping barrel 13 with a gap therebetween. A plurality of mounting boss portions 26 are provided at equal intervals along the front-rear direction on the horizontal surface portion 20H of the top plate 20 . The center of each mounting boss portion 26 is a vertical swing axis P, and the mounting boss portions 26 are arranged so that each second dust valve 24 can swing around the swing axis P. supported by That is, the plurality of second dust feed valves 24 are configured to swing around the swing axis P to change the feeding angle for feeding the harvested grain culms to the rear of the machine body. In addition, an interlocking link 25 is connected across one end of the plurality of second dust valves 24 in the front-rear direction, and the respective second dust valves 24 swing while interlocking with each other via the interlocking link 25 .

An adjustment lever 27 made of a spring plate is connected to the outside of the top plate 20 with the second dust valve 24 from the front among the plurality of second dust valves 24 via a mounting boss portion 26. is provided in a state of extending forward. The adjustment lever 27 is provided in a state that it can be operated from the operation section 7 through the window. The adjustment lever 27 and the second dust feed valve 24 swing integrally. When the operator swings the adjustment lever 27, the plurality of second dust valves 24 swing in the same swing direction and at the same angle via the interlocking link 25, and the plurality of second dust valves 24 swings. Feed angle changes. The more the adjustment lever 27 swings toward the right side of the machine body, the larger the feeding angle of the plurality of second dust feed valves 24 becomes, making it easier for the harvested grain culms to be guided to the rear side of the machine body.

The adjusting lever 27 is provided with a positioning pin 27A. A fixing member 28 is fixed to a portion of the horizontal surface portion 20</b>H that faces the positioning pin 27</b>A over the swinging range of the adjustment lever 27 . A plurality of pin holes 28a are formed in the fixing member 28 so as to be engageable with the positioning pins 27A. By inserting the positioning pin 27A into one pin hole 28a, the swinging position of the adjusting lever 27 is fixed. It is retained by member 28 . As a result, the plurality of second dust feed valves 24 are held at the feed angle corresponding to the swing position of the adjustment lever 27 .

When the operator lifts the free end of the adjusting lever 27, the elastic deformation of the adjusting lever 27 lifts the positioning pin 27A out of the pin hole 28a. In this state, the operator swings the adjustment lever 27 and inserts the positioning pin 27A into the other pin hole 28a, thereby changing and holding the feed angles of the plurality of second dust feed valves 24. .

A gate-shaped rise restricting member 20A having an upper end positioned above the adjustment lever 27 is provided in a portion of the horizontal surface portion 20H that extends over the swinging range of the adjustment lever 27 . The adjustment lever 27 passes through a region surrounded by the horizontal surface portion 20H and the rise restricting member 20A. When the operator lifts the free end of the adjusting lever 27 higher than the upper end of the lift restricting member 20A, the adjusting lever 27 and the lift restricting member 20A come into contact with each other, and the amount of upward elastic deformation of the adjusting lever 27 is restricted. Regulated by member 20A. This prevents the operator from lifting the adjusting lever 27 too much and plastically deforming the adjusting lever 27 .

A label 29 is provided adjacent to the fixing member 28 on the side on which the operating portion 7 is located.
The label 29 is provided so as to overlap the swinging range of the adjustment lever 27 in plan view. In other words, the feed angle of the second dust feed valve 24 corresponding to the swing angle of the adjustment lever 27 is displayed for each portion of the label 29 corresponding to the pin hole 28a. Also, the size of the feed angle of the second dust feed valve 24 is indicated by arrows on the label 29 . Among the ends of the arrow, the end on the side where the feed angle is large is displayed as "open", and the end on the side where the feed angle is small is displayed as "closed". As a result, the operator can operate the adjusting lever 27 while checking the label 29, and erroneous operation of the label 29 can be prevented.

[Lock mechanism]
As shown in FIG. 5 and the like, a lock mechanism 40 capable of holding the top plate 20 in a closed state is provided at a connecting portion between the right side portion of the top plate 20 and the upper end portion of the right side wall portion 9R of the threshing device 9. are provided.
The right side of the top plate 20 and the upper end of the right side wall 9R of the threshing device 9 are on the side opposite to the side where the hinge 20L is located. In this embodiment, three lock mechanisms 40 are provided side by side in the front-rear direction. Of the plurality of lock mechanisms 40, the first lock mechanism 40A is provided at the foremost end, the third lock mechanism 40C is provided at the rearmost end, and the second lock mechanism is provided between the first lock mechanism 40A and the third lock mechanism 40C. A mechanism 40B is provided. A lock mechanism 40 is provided with a hook 41 (first swing member) and a pin 42 . Further, an operation tool 44 capable of operating the first lock mechanism 40A and a holding member 45 (second swing member) as a holding mechanism are provided. Furthermore, an interlocking link 43A as a link mechanism that spans across the first lock mechanism 40A and the second lock mechanism 40B, and a link mechanism that spans across the second lock mechanism 40B and the third lock mechanism 40C and an interlocking link 43B are provided.

A state in which support portions 9Ra, 9Rb, and 9Rc for corresponding to the first lock mechanism 40A, the second lock mechanism 40B, and the third lock mechanism 40C are arranged in the front-rear direction on the upper end portion of the right side wall portion 9R of the threshing device 9. is provided in Each of the support portions 9Ra, 9Rb, and 9Rc is bolted to the upper end portion of the right side wall portion 9R. Stays 20Sa, 20Sb, and 20Sc are erected on the right side of the top plate 20 to correspond to the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, respectively. Each of the stays 20Sa, 20Sb, and 20Sc is welded and fixed to the right side of the top plate 20 so as to be aligned in the front-rear direction. When the top plate 20 is closed, the support portion 9Ra and the stay 20Sa face each other in the left-right direction, the support portion 9Rb and the stay 20Sb face each other in the left-right direction, and the support portion 9Rc and the stay 20Sc face each other in the left-right direction. do.

In each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, the lower ends of the hooks 41 are connected to the supporting portions 9Ra, 9Rb, and 9Rc via connecting pins 9Rp so as to be able to swing. be done. When viewed from the side of the machine body, the center of the connecting pin 9Rp is the swing axis Y in the sideways direction of the machine body, and the hooks 41 are attached to the support portions 9Ra, 9Rb, and 9Rc so as to swing around the swing axis Y, respectively. concatenated. This constitutes the first engaging portion in the present embodiment, and the first engaging portion extends upward from the upper end of the device main body 9W of the threshing device 9 .

The pins 42, 42, 42 of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C are attached to the stays 20Sa, 20Sb, and 20Sc, respectively, so as to protrude toward the side where the grain tank 8 is located. be done. This constitutes the second engaging portion in the present embodiment.

The pivot axis Y is located below the pin 42 in each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C. That is, in each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, the pivot axis Y and the pin 42 overlap in plan view. A hollow columnar collar 42A is provided along the circumferential direction of the pin 42, and the collar 42A is configured to be relatively rotatable with respect to the pin 42. As shown in FIG.

In each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, as shown in FIGS. A letter-shaped recess 41a is formed. In this embodiment, when the top plate 20 is in the closed state, the hook 41 swings clockwise in a right side view, and the concave portion 41a of the hook 41 is hooked to the pin 42, whereby the hook 41 and the pin 42 are hooked. It will be in the engagement state which engages. The position of the hook 41 at this time is the engagement position where the hook 41 and the pin 42 can be engaged. When the hook 41 is in the engaged position, the longitudinal direction of the hook 41 extends along the vertical direction of the aircraft body, and the opening of the concave portion 41a is located on the front side of the aircraft body. When the hook 41 swings counterclockwise in a right side view from the engaging position, the concave portion 41a is disengaged from the pin 42, and the hook 41 and the pin 42 are not engaged with each other (shown in FIGS. 7 and 8). state). The position of the hook 41 at this time is the retracted position (first retracted position). The retracted position of the hook 41 may be a position where the hook 41 and the pin 42 are not engaged. , can be changed as appropriate.

A cam 41 c (first cam) is formed at the free end of the hook 41 , and the cam 41 c can come into contact with the pin 42 . The cam 41c inclines so as to approach the swing axis Y toward the engagement position side of the hook 41 . When the top plate 20 swings toward the closed state while the cam 41c and the pin 42 are in contact with each other, the pressing force of the pin 42 acts on the cam 41c. Since the cam 41c inclines so as to approach the swing axis Y toward the engagement position side of the hook 41, the pressing force of the pin 42 consists of a downward force, a force in the direction of the retracted position side of the hook 41, distributed to As a result, the collar 42A contacts the cam 41c, the collar 42A rotates, and the hook 41 swings toward the retracted position while being pushed out by the pin 42. As shown in FIG. The cam 41c may be provided in any one of the first locking mechanism 40A, the second locking mechanism 40B and the third locking mechanism 40C. , and the third lock mechanism 40C.

An intermediate cam 41f is formed between the cam 41c and the recess 41a. The intermediate cam 41f is inclined so as to approach the swing axis Y toward the retracted position of the hook 41, and a mountain-like shape is formed between the cam 41c and the intermediate cam 41f. When the pin 42 moves downward with respect to the hook 41 and crosses the peak between the cam 41c and the intermediate cam 41f, the pin 42 is guided to the recess 41a along the intermediate cam 41f.

In each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, a connecting portion 41b is provided at a portion of the hook 41 between the pivot axis Y and the recess 41a. Both ends of a bar-shaped interlocking link 43A are pivotably connected to the connecting portions 41b of the first locking mechanism 40A and the second locking mechanism 40B, respectively. It spans the mechanism 40B in the front-rear direction. Both ends of a bar-shaped interlocking link 43B are pivotably connected to the connecting portions 41b of the second locking mechanism 40B and the third locking mechanism 40C. It extends in the front-rear direction across the three-lock mechanism 40C.

With this configuration, the hooks 41, 41, 41 of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C are interlocked with each other via the interlocking link 43A and the interlocking link 43B. That is, when the hook 41 of one lock mechanism 40 among the first lock mechanism 40A, the second lock mechanism 40B, and the third lock mechanism 40C swings to the engagement position side, the hooks 41 of all the other lock mechanisms 40 are also interlocked to swing toward the engagement position.
As a result, the hooks 41 and pins 42 in all the lock mechanisms 40 are switched from the disengaged state to the engaged state. Also when the hooks 41 and the pins 42 are switched from the engaged state to the disengaged state, all the hooks 41 interlock and swing toward the retracted position.

A torsion spring 46 as a biasing mechanism is wound around the connecting pin 9Rp in the first locking mechanism 40A. One end of the torsion spring 46 is engaged with the connecting portion 41b, and the other end of the torsion spring 46 is engaged with the spring receiving portion 9As provided at the lower rear portion of the support portion 9Ra. With the torsion spring 46 mounted in this way, the biasing force of the torsion spring 46 acts in the direction in which the distance between both ends of the torsion spring 46 increases, and the hook 41 is biased to swing toward the engagement position. ing.

With the grain tank 8 swinging to the right side of the machine body (the state indicated by the two-dot chain line in FIG. 3), a wider work space is secured on the right side of the machine body of the threshing device 9 toward the front side of the machine body. For this reason, compared to a configuration in which the operating tool 44 is provided in the second locking mechanism 40B or the third locking mechanism 40C, the operating tool 44 is arranged in the first locking mechanism 40A so that the operator can easily operate the operating tool 44. is provided in In the first lock mechanism 40A, the operation tool 44 is provided in a state of extending forward and upward from the hook 41 . A rocking base end portion of the operating tool 44 is fixed by welding to the hook 41 , and the operating tool 44 is supported by the front upper end portion of the right side wall portion 9</b>R of the threshing device 9 via the hook 41 . The operation tool 44 is formed of a circular metal rod in a cross-sectional view, and is configured to be vertically swingable about the swing axis Y in conjunction with the swinging motion of the hook 41 . Since the free end portion of the operating tool 44 faces forwardly of the machine body, the operator can operate the operating tool 44 through the window from the operation section 7 .

When the operator operates the operating tool 44 in the vertical direction, the hook 41 of the first locking mechanism 40A swings in conjunction with the second locking mechanism 40B and the third locking mechanism via the interlocking link 43A and the interlocking link 43B. The respective hooks 41, 41 at 40C also swing together.
When the operator operates the operating tool 44 upward, the respective hooks 41, 41, 41 swing to the retracted position side, and when the operator operates the operating tool 44 downward, the respective hooks 41, 41, 41 41 swings to the engagement position side. Even if the operator does not operate the operating tool 44 upward and then downward, the biasing force of the torsion spring 46 causes the hooks 41, 41, 41 to swing toward the engagement position.

When the top plate 20 is in the closed state and the respective hooks 41, 41, 41 swing to the engaging positions, the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C each close the top plate. 20 is held in the closed state. The vertical position of the operating tool 44 at this time is the lower limit position of the vertical swing range. Further, the lower limit position of the operating tool 44 is held by the biasing force of the torsion spring 46 . Alternatively, the operator operates the operating tool 44 downward with a force stronger than the biasing force of the torsion spring 46, thereby firmly locking the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C. It can be in a position holding state.

When the operator operates the operating tool 44 upward against the biasing force of the torsion spring 46, the respective hooks 41, 41, 41 swing toward the retracted position, and the respective hooks 41 and pins 42 are released. switched to the engaged state. As a result, the position holding states of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C are released.

[Holding Mechanism]
As shown in FIGS. 6 to 13, in the first locking mechanism 40A, a holding member 45 as a holding mechanism capable of holding the engagement state between the hook 41 and the pin 42 is provided on the free end side of the hook 41. ing. In the hook 41, a circular first protrusion 41d is formed on the free end side of the portion where the recess 41a is located, and serves as the axis of the holding member 45, that is, the swing axis Z in the lateral direction of the machine body. A circular second projecting portion 41e is formed on the free end side of the portion where the portion 41d is located. The holding member 45 is formed with a circular pin hole 45A engageable with the first protrusion 41d and an elongated hole 45B engageable with the second protrusion 41e. The elongated hole 45B is formed in an arcuate shape that curves around the pin hole 45A. The first protrusion 41d and the pin hole 45A are pin-connected, and the second protrusion 41e and the long hole 45B are engaged. In this state, the holding member 45 is supported by the hooks 41 and is configured to be swingable around the swing axis Z within the drilling range of the long hole 45B. That is, the holding member 45 is provided on the free end side of the hook 41 and configured to be able to swing relative to the hook 41 , but configured to be immovable with respect to the hook 41 . there is

A concave portion 45C is formed on one end side of the holding member 45 across the pivot axis Z, and the concave portion 45C can be hooked to the pin 42 . A tapered portion 45D is formed at the end portion of the holding member 45 opposite to the side where the concave portion 45C is located across the swing axis Z, and the tapered portion 45D has a width in the short direction toward the free end side. is designed to be small. Thus, the holding member 45 is configured such that the center of gravity of the holding member 45 is biased toward the side where the concave portion 45C is located with respect to the swing axis Z. As shown in FIG.

When the holding member 45 swings clockwise in the right side view, and the end of the elongated hole 45B and the second protrusion 41e contact each other, the recess 45C is positioned on the front side of the body with respect to the swing axis Z, Moreover, the recess 41a and the recess 45C face each other. The position of the holding member 45 at this time is a holding position where the holding member 45 closes the opening of the recess 41a.

When the holding member 45 swings counterclockwise in the right side view and the end of the elongated hole 45B and the second protrusion 41e contact, the holding member 45 is positioned as shown in FIGS. 11 to 13. Then, the holding member 45 is in the retracted position (second retracted position) where the opening of the recess 41a is opened. The concave portion 45C is positioned above the pivot axis Z, and the tapered portion 45D is positioned below the pivot axis Z. In this state, the center of gravity of the holding member 45 is located above the swing axis Z, so that the holding member 45 is configured to easily swing to the holding position by its own weight. The retracted position of the holding member 45 may be a position where the holding member 45 opens the opening of the recess 41a. can be changed as appropriate.

When the hook 41 and the pin 42 are engaged with each other, the holding member 45 swings toward the holding position, and when one end of the elongated hole 45B and the second projection 41e contact each other, the recess 45C engages with the pin 42. The holding member 45 and the pin 42 are engaged with each other by being hooked from above. In this state, if the hook 41 is to be swung toward the retracted position, the hooking of the recess 45C to the pin 42 is held, and the opening of the recess 41a is kept closed. At this time, the holding member 45 does not swing, and the reaction force to the swing of the hook 41 is transmitted from the holding member 45 to the hook 41 via the first protrusion 41d. When the holding member 45 and the pin 42 are engaged with each other, the hook 41 cannot swing, and the engagement between the hook 41 and the pin 42 cannot be released. Further, due to the interlocking linkage of the interlocking link 43A and the interlocking link 43B, the engaged state of the hook 41 and the pin 42 cannot be released also in the second locking mechanism 40B and the third locking mechanism 40C. As a result, the holding member 45 enters a holding state for holding the position holding state of the first locking mechanism 40A. That is, the holding member 45 can close the opening of the recess 41a in the hook 41 so that the pin 42 does not come off.

When the holding member 45 is in the holding state and the operator operates the holding member 45 to swing the holding member 45 to the retracted position, the concave portion 45C moves upward away from the pin 42, and the holding member 45 and the pin 42 are separated. The engagement state is released. As a result, the hook 41 can swing, and the position holding state of the first locking mechanism 40A can be released.

As described above, when the holding member 45 is at the retracted position, the center of gravity of the holding member 45 is located above the swing axis Z, so the holding member 45 swings to the holding position by its own weight. easy. Therefore, as shown in FIGS. 7 and 10, when the operator closes the top plate 20, the holding member 45 is likely to be positioned at the holding position. Even in such a case, in order to save the operator from having to swing the holding member 45, a cam 45E ( second cam) is formed. Details of the cam 45E will be described later.

[Operation of locking mechanism and holding mechanism]
As shown in FIG. 7, when the operator operates the grip portion 21 of the top plate 20 to swing the top plate 20 toward the closed state (in the direction of the arrow DW), the cam 41c of the hook 41 and the pin 42 are brought into contact with each other. abuts.
When the top plate 20 further swings toward the closed state, the pressing force of the pin 42 acts on the cam 41c.
Since the cam 41c is inclined so as to approach the swing axis Y toward the engagement position, the pressing force of the pin 42 consists of a downward force, a force in the direction of the retracted position (the direction of the arrow CCW), distributed to As a result, the collar 42A contacts the cam 41c, the collar 42A rotates, and the hook 41 swings toward the retracted position while being pushed out by the pin 42. As shown in FIG. Then, when the pin 42 reaches the vicinity of the crest between the recess 41a and the cam 41c, the cam 45E and the pin 42 come into contact with each other.

As shown in FIG. 8, when the top plate 20 further swings toward the closed state (in the direction of arrow DW) and the hook 41 further swings toward the retracted position (in the direction of arrow CCW), the pin 42 moves toward the cam. It reaches the crest between 41c and intermediate cam 41f. At this time, the rear end of the cam 45E, that is, the end of the cam 45E on the retracted position side and the pin 42 come into contact with each other. When the holding member 45 is in the holding position, the end of the cam 45E on the retracted position side overlaps the end of the cam 41c on the engaging position side. Therefore, after the pin 42 passes over the end of the cam 41c on the engaging position side, the pin 42 contacts the intermediate cam 41f and the cam 45E.

As shown in FIG. 9, when the top plate 20 further swings toward the closed state (in the direction of the arrow DW) and the pin 42 passes over the crest between the cam 41c and the intermediate cam 41f, the torsion spring 46 , the hook 41 of the first lock mechanism 40A swings toward the engagement position (in the direction of arrow CW1). At this time, the intermediate cam 41f guides the pin 42 into the recess 41a, and the pin 42 enters toward the recess 41a. At the same time, the hooks 41, 41 of the second locking mechanism 40B and the third locking mechanism 40C are also pivoted to the engagement position side through the interlocking link 43A and the interlocking link 43B. At this time, the cam 45E and the pin 42 come into contact with each other, and the pressing force of the pin 42 acts on the cam 45E. Since the cam 45E inclines so as to approach the swing axis Z toward the holding position, the pressing force of the pin 42 consists of a force in the direction toward the concave portion 41a and a force in the direction toward the retracted position (the direction of the arrow CCW). , and distributed to The collar 42A and the cam 45E contact each other to rotate the collar 42A, and the holding member 45 swings toward the retracted position while being pushed out by the pin 42. As shown in FIG. In other words, the holding member 45 receives an upward force due to the swinging of the hook 41 and the abutment of the cam 45E and the pin 42, and swings toward the retracted position.

As shown in FIG. 10, when the top plate 20 further swings toward the closed state (direction of arrow DW), the hook 41 swings toward the engaging position (direction of arrow CW1). At this time, in each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C, the recessed portion 41a and the pin 42 are engaged with each other, and the hook 41 and the pin 42 can be engaged. Further, when the holding member 45 swings toward the retracted position (in the direction of the arrow CCW) and the pin 42 passes over the peak between the concave portion 45C and the cam 45E of the holding member 45, the holding member 45 is held by its own weight. It swings to the position side (direction opposite to arrow CCW). Then, by the biasing force of the torsion spring 46 or when the operator operates the operating tool 44 downward, the pin 42 enters the concave portion 41a and the hook 41 and the pin 42 are engaged. At the same time, the holding member 45 swings to the holding position, and the holding member 45 and the pin 42 are engaged. Thus, even when the holding member 45 is positioned at the holding position when the top plate 20 is closed, the holding member 45 is pushed by the pin 42 by the cam 45E and swings toward the retracted position. . As a result, each of the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C can be brought into the position holding state simply by swinging the top plate 20 toward the closed state without manipulating the holding member 45 manually. , and the holding member 45 is configured to be in the holding state.

As shown in FIGS. 11 to 13, when the operator closes the top plate 20, the holding member 45 may be positioned at the retracted position. As shown in FIG. 11, when the top plate 20 swings toward the closed state (in the direction of the arrow DW), the collar 42A contacts the cam 41c and the collar 42A rotates. 41 swings toward the retracted position (direction of arrow CCW). At this time, the holding member 45 does not swing relative to the hook 41 but swings around the swing axis Y integrally with the hook 41 .

As shown in FIG. 12, when the top plate 20 further swings toward the closed state (in the direction of arrow DW) and the hook 41 further swings toward the retracted position (in the direction of arrow CCW), the pin 42 moves toward the cam. It reaches the crest between 41c and intermediate cam 41f. In this state, the top plate 20 further swings toward the closed state, and when the pin 42 passes over the ridge between the cam 41c and the intermediate cam 41f, the biasing force of the torsion spring 46 causes the first lock mechanism 40A to close. , the hook 41 swings toward the engagement position (in the direction opposite to the arrow CCW). At this time, the intermediate cam 41f guides the pin 42 into the recess 41a, and the pin 42 enters toward the recess 41a. Also at this time, the holding member 45 does not swing relative to the hook 41 but swings around the swing axis Y integrally with the hook 41 .

As shown in FIG. 13 , when the hook 41 swings toward the engagement position and then stops at the engagement position, the force of inertia due to the swinging of the hook 41 acts on the holding member 45 in the forward direction. As described above, since the center of gravity of the holding member 45 is located above the swing axis Z, when a forward force acts on the holding member 45, the holding member 45 is moved toward the holding position (in the direction of the arrow CW). ), and the holding member 45 swings toward the holding position. As a result, even when the holding member 45 is at the retracted position when the operator closes the top plate 20, the locking mechanism 40 is placed in the position holding state without manipulating the holding member 45. The holding member 45 is configured to be in a holding state.

[Another embodiment]
The present invention is not limited to the configurations exemplified in the above embodiments, and other representative embodiments of the present invention will be exemplified below.

(1) In the above-described embodiment, the hinge 20L is provided on the left side of the threshing device 9, and the lock mechanism 40 is provided on the right side of the threshing device 9. However, the hinge 20L is provided on the right side of the threshing device 9. Alternatively, the lock mechanism 40 may be provided on the left side of the threshing device 9 .

(2) In the above-described embodiment, the lock mechanism 40 is composed of the first lock mechanism 40A, the second lock mechanism 40B, and the third lock mechanism 40C. is not limited to three, and can be appropriately changed to one, two, four, or the like.

(3) In the above-described embodiment, the first engaging portion is the hook 41 and the second engaging portion is the pin 42, but the present invention is not limited to the above-described embodiment. For example, the first engaging portion and the second engaging portion may be configured by buckles or magnets.

(4) In the above-described embodiment, the hook 41 is supported by the support portions 9Ra, 9Rb, and 9Rc of the right side wall portion 9R, and the pin 42 is supported by the stays 20Sa, 20Sb, and 20Sc of the top plate 20. It is not limited to the embodiment. For example, the hook 41 may be swingably supported by the stays 20Sa, 20Sb, and 20Sc of the top plate 20, and the pin 42 may be supported by the support portions 9Ra, 9Rb, and 9Rc of the right side wall portion 9R.

(5) In the above-described embodiment, the holding member 45 swings toward the holding position by its own weight, and the concave portion 45C is hooked to the pin 42 from above. However, the present invention is not limited to the above-described embodiment. For example, a spring member that biases the holding member 45 toward the holding position may be provided across the holding member 45 and the hook 41 . Further, in this state, the concave portion 45C may be hooked to the pin 42 from below.

(6) In the above-described embodiment, the holding member 45 is configured to be able to close the opening of the recess 41a in the hook 41, but the holding member 45 does not close all the openings of the recess 41a. The opening may be partially closed. That is, as long as the pin 42 does not come off the recess 41a of the hook 41, the degree to which the holding member 45 blocks the opening of the recess 41a can be changed as appropriate.

(7) In the embodiment described above, the holding member 45 is swingably supported by the hook 41, but is not limited to the embodiment described above. For example, the holding member 45 may be supported by the upper end portion of the right side wall portion 9R and configured to be swingable with respect to the right side wall portion 9R. In this state, the holding member 45 may be configured to hold the engaged state between the hook 41 and the pin 42 by engaging the holding member 45 and the hook 41 .

(8) In the above-described embodiment, the hook 41 is configured to be swingable about the swing axis Y, and the holding member 45 is configured to be swingable about the swing axis Z. The form is not limited. For example, the hook 41 may be configured to slide in the front-rear direction or the left-right direction with respect to the upper end portion of the right side wall portion 9R. At this time, hook 41 may be biased into engagement with pin 42 . Further, the holding member 45 may slide on the hook 41, or the holding member 45 may slide on the upper end portion of the right side wall portion 9R in the front-rear direction or the left-right direction. good. Alternatively, the hook 41 may be fixed to the support portions 9Ra, 9Rb and 9Rc so as to be non-operable, and the pin 42 may slide on the stays 20Sa, 20Sb and 20Sc.

(9) In the above-described embodiment, the interlocking links 43A, 43B interlocking with the first locking mechanism 40A, the second locking mechanism 40B, and the third locking mechanism 40C are provided. It may be a configuration without

(10) In the above-described embodiment, the holding member 45 is provided in the first locking mechanism 40A. good. Further, the holding member 45 may be provided in any one of the first locking mechanism 40A, the second locking mechanism 40B and the third locking mechanism 40C, or may be provided in the first locking mechanism 40A, the second locking mechanism 40B and the third locking mechanism. A configuration in which each of the mechanisms 40C is provided with a plurality of them may be used. That is, a plurality of holding members 45 may be provided.

(11) In the above-described embodiment, the operating tool 44 is provided in the first locking mechanism 40A. good. Further, the operation tool 44 may be provided in any one of the first locking mechanism 40A, the second locking mechanism 40B and the third locking mechanism 40C, or the first locking mechanism 40A, the second locking mechanism 40B and the third locking mechanism. A configuration in which each of the mechanisms 40C is provided with a plurality of them may be used. That is, a plurality of manipulators 44 may be provided.

(12) In the above-described embodiment, the collar 42A is configured to be rotatable relative to the pin 42, but the collar 42A is configured integrally with the pin 42 so as to be non-rotatable relative to the pin 42. It's okay to be there. Further, the pin 42 may not be provided with the collar 42A.

The present invention is applicable not only to a common combine harvester but also to a self-threshing combine harvester.

1: Body frame 7: Driving unit 8: Glen tank 9: Threshing device 9W: Device body 20: Top plate 20Sa: Stay 20Sb: Stay 20Sc: Stay 40: Lock mechanism 41A: First lock mechanism 41B: Second lock mechanism 41C : Third locking mechanism 41 : Hook (first engaging portion, first swinging member)
41c: cam (first cam)
42: Pin (second engaging portion, second swinging member)
43A: Interlocking link (link mechanism)
43B: Interlocking link (link mechanism)
45: holding member (holding mechanism)
45E: Cam (second cam)

Claims (7)

A threshing device for threshing harvested grain culms includes a device main body supported by a body frame, an open state in which the upper portion is opened upward, and the upper portion supported by the upper portion of the device main body so as to be swingable about a horizontal axis. and a lock mechanism capable of holding the position of the top plate in the closed state,
The lock mechanism includes a first engaging portion provided on one of the top plate and the apparatus main body and engageable with the first engaging portion provided on the other of the top plate and the apparatus main body. and a second engaging portion,
A holding mechanism capable of holding an engaged state in which the first engaging portion and the second engaging portion are engaged,
The first engaging portion is configured to be switchable between an engaging position in which it can engage with the second engaging portion and a first retracted position in which it does not engage with the second engaging portion,
The first engaging portion is provided with a biasing mechanism that biases the first engaging portion toward the engaging position,
The holding mechanism is configured to be switchable between a holding position capable of holding the engaged state and a second retracted position not holding the engaged state,
When the top plate moves in the direction of the closed state, the pressing force of the second engaging portion acts on the first engaging portion, and the first engaging portion becomes the first retracted position. Further, when the top plate moves in the direction of the closed state, the first engaging portion is brought to the engaging position by the biasing force of the biasing mechanism, and the first engaging portion and the second The two engaging portions are engaged,
When the top plate moves in the direction of the closed state, the pressing force of the second engaging portion acts on the holding mechanism, and the holding mechanism moves to the second retracted position. After the top plate moves in the direction of the closed state and the first engaging portion and the second engaging portion are engaged, the holding mechanism assumes the holding position and holds the engaged state. . A threshing device for threshing harvested grain culms includes a device main body supported by a body frame, an open state in which the upper portion is opened upward, and the upper portion supported by the upper portion of the device main body so as to be swingable about a horizontal axis. and a lock mechanism capable of holding the position of the top plate in the closed state,
The lock mechanism includes a first engaging portion provided on one of the top plate and the apparatus main body and engageable with the first engaging portion provided on the other of the top plate and the apparatus main body. and a second engaging portion,
A holding mechanism capable of holding an engaged state in which the first engaging portion and the second engaging portion are engaged,
The first engaging portion is configured to be switchable between an engaging position in which it can engage with the second engaging portion and a first retracted position in which it does not engage with the second engaging portion,
The holding mechanism is configured to be switchable between a holding position capable of holding the engaged state and a second retracted position not holding the engaged state,
When the top plate moves in the direction of the closed state and the pressing force of the second engaging portion acts on the first engaging portion, the first engaging portion switches to the first retracted position side. configured to be
When the top plate moves in the direction of the closed state and the pressing force of the second engaging portion acts on the holding mechanism, the holding mechanism is switched to the second retracted position side,
The first engaging portion is provided with a biasing mechanism that biases the first engaging portion toward the engaging position,
The first engaging portion includes a first swinging member swingably supported by one of the top plate and the device main body,
The holding mechanism is provided with a second swinging member swingably supported on a side of the top plate and the device main body on which the first swinging member is provided,
the first swing member is provided with a first cam capable of coming into contact with the second engaging portion;
the second swing member is provided with a second cam capable of coming into contact with the second engaging portion;
The first swinging member is configured to swing toward the first retracted position when a pressing force of the second engaging portion acts on the first cam,
The combine harvester configured so that the second swinging member swings toward the second retracted position when a pressing force of the second engaging portion acts on the second cam. The combine according to claim 2, wherein said second swing member is swingably supported by said first swing member. A driving unit is provided in front of the threshing device, a grain tank is provided behind the driving unit and on the side of the threshing device, and the top plate is located on the side opposite to the side where the grain tank is located. It is configured to swing to the outside of the fuselage,
A plurality of the lock mechanisms are arranged in the front-rear direction on the side of the threshing device on the side where the grain tank is located,
a link mechanism that spans across the plurality of lock mechanisms and interlocks the plurality of lock mechanisms; 4. A combine according to any one of claims 1 to 3, provided with a possible operating tool. A stay for attaching the second engaging portion is erected at an end of the top plate,
The combine according to claim 4, wherein the first engaging portion extends upward from the upper end of the device body. 6. The first engaging portion is a hook, the second engaging portion is a pin, and the holding mechanism is capable of closing the opening of the hook so that the pin does not come off. A combine according to paragraph 1. The combine according to claim 6, wherein the hook is provided on the device main body, and the pin is provided on the top plate.

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