JP2017169507A - Mid-mount mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mid-mount mower in which a locking mechanism for installation of a mower unit enabling holding of lock operation and a locked position in a small space without being disturbed by a sub-frame is desired.SOLUTION: A mid-mount mower includes: a lifting/lowering link mechanism containing a front link and a rear link, and for suspending a mower unit; an engagement part fitted to the lifting/lowering link mechanism, and provided in an intermediate frame; an engaged part provided in a mower unit, and engaged with an engagement part along with the movement in the longitudinal direction of a machine body where front wheels get over the mower unit; a turning locking device turned between a locking position for locking an intermediate frame and a blade housing in an engagement state between the engagement part and the engaged part and an unlocked position; a turning operating body for turning and operating the turning locking device; and a lock holder for holding a locking position of the turning locking device. The turning locking device, the turning operating body and the lock holder are provided inside the intermediate frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mid-mount mower equipped with a mower unit below a fuselage between a front wheel and a rear wheel.

  In the mid-mount mower, the mower unit is suspended from the airframe during the mowing operation, and the mower unit is removed from the airframe during maintenance and inspection of the mower unit or when performing work other than mowing work. In the narrow space between the front wheel and the rear wheel, the connection of the mower unit to the airframe and the work of detaching from the airframe are heavy on the operator. For this reason, it has been proposed for some time to automatically perform at least a part of the mower unit connection / disconnection operation.

  For example, in the mid-mount mower described in Patent Document 1, the engaging portion provided in the lifting link mechanism fixed to the airframe and the engaged portion provided in the mower deck are arranged in the front-rear direction of the airframe. Engage when moving over the moor deck by moving. At the position where the engaging portion and the engaged portion are engaged, the machine body side coupling and the moor deck side coupling of the power transmission mechanism that transmits engine power to the mower unit can be connected. Such a connection state between the airframe including power transmission and the mower deck is locked by a lock mechanism. The lock mechanism includes a rotation operation shaft extending to the end of the mower deck in the vehicle transverse direction (lateral direction), and is locked by turning the operation arm provided at the end of the rotation operation shaft to the lock position. The mechanism is locked, and the lock mechanism is unlocked by turning the operation arm to the unlock position. It is also possible to hold the operating arm in the locked position by the lock holding member.

US Patent Publication No. 2015/0181803

In order to use the mid-mount mower for multiple purposes, it has been attempted to attach a front loader device or a backhoe device to the airframe from which the mower unit has been removed. In order to mount the front loader device and the backhoe device, it is necessary to reinforce the fuselage frame. For this purpose, a subframe extending in the longitudinal direction of the fuselage is also attached outside the pair of left and right frames extending in the longitudinal direction. It is done. Since the subframe increases the width of the airframe, the lock mechanism is locked when the mower deck is connected to the airframe, and the work of maintaining the lock position is obstructed.
Therefore, there is a demand for a mower unit mounting lock mechanism that can be locked and held in a small space without being obstructed by the subframe.

  A mower according to the present invention is a mid-mount mower equipped with a mower unit between a front wheel and a rear wheel below a fuselage, and includes a main frame extending in the longitudinal direction of the fuselage, a front link, and a rear link. A lifting link mechanism for suspending the mower unit, an intermediate frame attached to the lifting link mechanism, an engaging portion provided in the intermediate frame, a blade housing of the mower unit, and the front wheel The intermediate frame in an engaged state between the engaged portion and the engaged portion with the engaged portion engaged with the engaging portion as the aircraft moves over the mower unit in the front-rear direction. And a rotation lock body that rotates between a lock position that locks the blade housing and an unlock position, and an inner side of the intermediate frame, A rotating operation body for rotational operation of the click member, the provided inside of the intermediate frame, and a lock holder for holding the locking position of the rotary lock member.

  According to this configuration, when the front wheel of the machine body moves over the mower unit, the engaging portion of the intermediate frame attached to the lifting link mechanism and the engaged portion attached to the mower unit are engaged. In this engaged state, the intermediate frame and the mower unit are locked by rotating the rotation lock body to the lock position. Furthermore, the lock position of the rotation lock body can be held by the lock holding body. Since this lock holding body is provided inside the intermediate frame, the connecting and locking operation of the lifting link mechanism and the mower unit can be performed inside the intermediate frame.

  Since the lock holder is disposed inside the intermediate frame, the sub frame and the lock holder do not interfere even if the sub frame for attaching the front loader device or the like is provided on both outer sides of the main frame. In addition, since the number of members positioned outside the intermediate frame is reduced, a structure that does not contact the lower end of the subframe can be easily employed even if the lifting stroke of the mower unit is sufficiently secured.

  When a compact configuration as much as possible is desired, the rotating operation body and the lock holding body may be configured integrally. In one specific embodiment, the lock holding body is supported by an arm member fixed to a rotation operation shaft, and is a lock that can be inserted into a holding hole provided in the intermediate frame at a lock position. It is a pin, and the lock pin and the arm member constitute the rotating operation body. In that case, the operation surface for fingers can be easily created by bending the lock pin into a U-shape. Furthermore, it can have a part that can be inserted into the holding hole and a part that is inserted into the guide hole for rotation operation provided in the intermediate frame by bending it into a U shape.

  If the rotating operation body and the lock holding body are configured separately, the degree of freedom of arrangement of each of them can be improved. In one specific embodiment, the rotation operation body is a lever member fixed to the rotation lock body, and the lock holding plate fixed to the rotation lock body and the lock holding plate The lock pin that can be inserted into the provided holding hole constitutes the lock holding body. The lock pin only needs to have a function of being inserted into the holding hole, and can be easily manufactured.

It is a schematic diagram which shows the basic structure of the mid-mount type mower by this invention. It is a side view of a mower equipped with a mower unit. It is a side view of the mower equipped with the front loader device. It is a top view which shows the main frame and sub-frame of a mower. It is a perspective view of a mower unit. It is a top view which shows a raising / lowering link mechanism and an intermediate | middle frame. It is a perspective view which shows a raising / lowering link mechanism and an intermediate | middle frame. It is an exploded view which shows a raising / lowering link mechanism and an intermediate | middle frame. It is a top view of the mower unit in which a plurality of members were omitted. It is a top view which shows the lock release state of an intermediate | middle frame and a mower unit. It is a top view which shows the locked state of an intermediate | middle frame and a mower unit. It is a perspective view of an intermediate frame. It is a side view of the lock mechanism in the unlocked state. It is a side view of the lock mechanism in a locked state. It is a perspective view of the lock mechanism in a locked state. It is a side view of the lock mechanism of a lock release state in another embodiment. It is a side view of the lock mechanism of a locked state in another embodiment. It is a perspective view of the lock mechanism of a locked state in another embodiment.

  An embodiment of a mid-mount mower according to the present invention (hereinafter simply referred to as a mower) will be described. FIG. 1 shows an elevating link mechanism 3 mounted on a main frame 10 that is a basic structure of the mower and a mower unit 4 attached to the elevating link mechanism 3 as the mower moves in the front-rear direction. The state before and after the mounting is schematically shown. An elevating link mechanism 3 including a pair of left and right front links 31 and a rear link 32 is provided at the lower part of the machine body. The intermediate frame 6 is suspended by the free end of the front link 31 and the free end of the rear link 32. The free end of the front link 31 and the free end of the rear link 32 are connected to the intermediate frame 6 via a swing axis, and the intermediate frame 6 is displaced up and down with respect to the ground by the swing of the lift link mechanism 3. The intermediate frame 6 is provided with an engaging portion 610, and the blade housing 40 of the mower unit 4 is provided with an engaged portion 620 that can be connected to the engaging portion 610.

  As shown in FIG. 1, when the front wheel 2 a gets over the mower unit 4 with an appropriate positional relationship, the engaging portion 610 of the intermediate frame 6 engages with the engaged portion 620 of the blade housing 40. Thereby, the blade housing 40 and the intermediate frame 6 are connected, and as a result, the connection between the mower unit 4 and the body of the mower is realized. A lock mechanism 8 is provided that locks the coupling position (engaged state) between the engaging portion 610 and the engaged portion 620 realized here and mechanically holds the locked state. The components of the lock mechanism 8 are only schematically shown in FIG. 1, but are housed within the range of the intermediate frame 6 in plan view.

  Furthermore, in order to transmit the rotational power from the engine 23 to the mower unit 4 mounted on the main frame 10, the blade power transmission mechanism 25 is set in a connected state capable of transmitting power. The blade power transmission mechanism 25 includes a machine body side power transmission mechanism 25 </ b> A and a mower side power transmission mechanism 25 </ b> B which are separated or connected by the power coupling mechanism 7.

  One embodiment of this mower is shown in FIG. This mower equipped with a mower unit 4 between the front wheel 2a and the rear wheel 2b is equipped with a water-cooled engine (diesel engine) 23 covered with a bonnet 11 in the front half of the main frame 10. The driver seat 21 is disposed in the latter half of the main frame 10. The front wheel 2a is a steered wheel operated by the steering wheel 22, and at the same time is a drive wheel. This four-wheel drive is used, and the rear wheel 2b is also a drive wheel. A transmission case 13 is provided in the rear half of the main frame 10.

  This mower can be used as a general tractor by removing the mower unit 4. Further, instead of the mower unit 4, as shown in FIG. In order to equip a heavy equipment such as the front loader device FL, the main frame 10 of the mower is reinforced by a subframe 20 as shown in FIG. The sub-frame 20 includes a left sub-frame member 20a extending in the front-rear direction of the fuselage with a distance in the cross-machine direction from the left end of the main frame 10, and a front-rear direction of the main frame 10 with a distance in the cross-machine direction. A right subframe member 20b extending to the left, a front cross member 21a connecting the left subframe member 20a and the right subframe member 20b on the front side, and a left subframe member 20a and the right subframe member 20b on the rear side. The rear cross member 21b is connected. The left sub-frame member 20a and the right sub-frame member 20b are made of a plate material, and the front region above the blade housing 40 is separated from the main frame 10 and thereafter sandwiched between the rear wheel 2b and the main frame 10. The area is close to the main frame 10.

  Next, the structure which connects the raising / lowering link mechanism 3 and the mower unit 4 using the intermediate | middle frame 6 is demonstrated. FIG. 5 shows the mower unit 4 alone, and FIGS. 6, 7, and 8 show the intermediate frame 6 connected to the elevating link mechanism 3. In FIG. 8, the front link 31, the rear link 32, and the intermediate frame 6 are shown in a separated state.

  The mower unit 4 includes a vertical rotation shaft 43a that rotates three blades arranged in the cross-machine direction in a plan view in a clockwise direction and a blade housing 40 that covers these blades from above. The blade housing 40 includes a top plate 41 and a side plate 42 extending downward from the periphery of the top plate. The top plate 41 of the blade housing 40 is provided with a power distribution mechanism 44 for driving the blade. The blade housing 40 forms an upwardly extending bulging portion on the left and right sides in the front region thereof, thereby creating a conveyance path for cutting grass therein. A discharge cover 40a is attached to the right end of the blade housing 40 that serves as a discharge port of the conveyance path.

  The power distribution mechanism 44 is shown in an easy-to-understand manner in FIG. 9 in which the illustration of a plurality of members is omitted. The power distribution mechanism 44 is a belt that distributes the power received by the input shaft 44b and the input shaft 44b extending rearward from the housing 44a disposed in the center of the blade housing 40 to the three rotation shafts 43a to which the blades 43 are fixed. A transmission mechanism 44c is provided.

  Next, the intermediate frame 6 will be described with reference to FIGS. The intermediate frame 6 includes a first member 61 and a second member 62 that extend in the longitudinal direction of the machine body with a space therebetween, and a front connecting member 63 that connects the front portions of the first member 61 and the second member 62. The frame structure includes a rear connecting member 64 that connects rear portions of the first member 61 and the second member 62. The front connecting member 63 is a rod body having a central portion protruding in a convex shape, and a hook-like free end portion of the front link 31 of the elevating link mechanism 3 is swingably locked to the protruding portion. . A free end portion of the rear link 32 of the elevating link mechanism 3 is pin-coupled to the rear portions of the first member 61 and the second member 62 through a link pin 39 so as to be swingable.

In order to connect the intermediate frame 6 and the blade housing 40, the intermediate frame 6 is provided with an engaging portion 610. As shown in FIG. 9, the top plate 41 of the blade housing 40 has an engaging portion 610. To be engaged is provided. further,
In the rear region of the top plate 41 of the blade housing 40, a lock fixing rod 80 constituting a lock mechanism 8 described in detail later extends in the vehicle body transverse direction (lateral direction).

  10 shows the disengaged state of the power connecting mechanism 7 and the unlocked state of the lock mechanism 8, and FIG. 11 shows the connected state of the power connecting mechanism 7 and the locked state of the lock mechanism 8. The second power take-out shaft 17 extending from the machine body side transmits power to the input shaft 44b (see FIG. 9) of the power distribution mechanism 44 of the mower unit 4, and the blade power transmission mechanism 25 therebetween is the same as FIG. As can be understood from FIG. 11, the vehicle body side power transmission mechanism 25 </ b> A and the moor side power transmission mechanism 25 </ b> B are divided and separated or connected by a power connection mechanism 7 provided in the intermediate frame 6.

  As can be understood from FIGS. 10, 11, and 12, the power coupling mechanism 7 includes a coupling body 70, which is the second universal joint 25 c in this embodiment, and surrounds the coupling body 70. A coupling holding portion 73 that holds the coupling body 70 on the peripheral surface, and a mounting unit 75 that attaches the coupling holding portion 73 to the intermediate structure so as to be displaceable in the longitudinal direction of the machine body. The coupling body 70 includes a first connection end 71 connected to the relay shaft 25a and a second connection end 72 connected to the input shaft 44b. The second connection end 72 is formed on the input shaft 44b. And an inner peripheral surface formed with a spline that engages with the spline. The coupling holding portion 73 is a plate-like boss having extension pieces on both sides. The coupling body 70 is fixed to the boss hole of the plate-like boss, and moves toward the input shaft 44 b of the power distribution mechanism 44. Thus, the input shaft 44b and the second connecting end portion 72 have a function of spline engagement.

  As shown in FIG. 12, in a state where the intermediate frame 6 is connected to the blade housing 40, the coupling body 70 moves in the front-rear direction by swinging the operation lever 83. As a result, coupling (spline coupling) of the coupling body 70 that functions as the output shaft of the machine-side power transmission mechanism 25A (spline coupling) or detachment from the input shaft 44b is realized.

  Next, with reference to FIGS. 10 to 15, the lock mechanism 8 that firmly attaches the mower unit 4 to the airframe by locking the engaging portion 610 and the engaged portion 620 at the engaging position will be described. . The lock mechanism 8 includes a lock unit LU, a rotating operation body 84, and a lock holding body 85. The lock fixing rod 80 is made of a round bar, and is fixed to the rear end region of the top plate 41 of the blade housing 40 along the transverse direction of the machine body. The rotation operation shaft 880 is made of a round bar, and is parallel to the rear connection member 64 on the front side of the rear connection member 64 across the rear end portion of the first member 61 and the rear end portion of the second member 62 of the intermediate frame 6. Is provided. A pair of left and right rotation lock bodies 82 are fixed to the rotation operation shaft 880 at intervals. The rotation lock body 82 is a hook-shaped arm, and has a hook shape that can hold the lock fixing rod 80 from above by rotating from the unlocking position to the locking position. With the engaging portion 610 provided on the intermediate frame 6 and the engaged portion 620 provided on the blade housing 40 engaged, the lock fixing rod 80 and the rotation operation shaft 880 are in a parallel state. And the interval between them is the interval at which the rotation lock body 82 can hold the lock fixing rod 80.

  As shown in FIGS. 13 to 15, the rotation operation body 84 rotates the rotation operation shaft 880 to change the position of the rotation lock body 82 between the lock position and the lock release position. . The lock holding body 85 holds the lock position of the rotation lock body 82 by prohibiting the rotation of the rotation operation body 84 at the lock position of the rotation lock body 82.

  In this embodiment, the rotating operation body 84 and the lock holding body 85 are integrally formed, and are located inside the intermediate frame 6 in the plan view of the body, that is, between the first member 61 and the second member 62. Arranged between. The rotating operation body 84 includes an arm member 841 and a lock pin 842. The arm member 841 is a plate material, is fixed to the rotation operation shaft 880, and extends in the radial direction of the rotation operation shaft 880. The lock pin 842 is a U-shaped pin and includes a first leg 842a, a second leg 842b, and an arch portion 842c that connects the first leg 842a and the second leg 842b. The first leg 842a and the second leg 842b are slidably inserted into two holes penetrating the arm member 841. The second leg 842b is longer than the first leg 842a, and a spring urging tool 843 is attached to the free end side of the second leg 842b. The spring urging tool 843 has a well-known structure, applies an elastic load to the withdrawal of the lock pin 842, and returns the lock pin 842 to the home position when the withdrawal force is lost.

  The first member 61 is provided with a first holding hole 852a and a second holding hole 852b. At the lock position of the rotation lock body 82, the first leg 842a can be inserted into the first holding hole 852a. At the unlock position of the rotation lock body 82, the second leg 842b can be inserted into the second holding hole 852b. That is, the lock pin 842 (specifically, the first leg 842a) and the first holding hole 852a function as the lock holding body 85, and the second holding hole 852b functions as a guide hole for the lock pin 842.

  After the engaging portion 610 and the engaged portion 620 are engaged, the arch portion 842c of the lock pin 842 is grasped and the lock pin 842 is pulled out, and the arm member 841 is rotated until the rotation lock body 82 is in the lock position. Move. When the hand is released from the arch portion 842c at the rotation position, the second leg 842b enters the first holding hole 852a, and the lock position of the rotation lock body 82 is held.

  FIGS. 16 to 18 show another embodiment of the lock mechanism 8 in which the rotary operation body 84 and the lock holding body 85 are configured separately. Also here, the rotating operation body 84 and the lock holding body 85 are disposed inside the intermediate frame 6, that is, between the first member 61 and the second member 62 in plan view of the machine body.

  In this alternative embodiment, the lock holding body 85 is formed as a plate-like lever member that is fixed to the rotation operation shaft 880 and the arm member 841 is a plate material. Can be rotated. The rotation lock body 82 includes a fan-shaped lock holding plate 855 and a lock pin 856. The lock holding plate 855 is fixed to the rotation operation shaft 880, and a first through hole 855a and a second through hole 855b are formed at intervals in the circumferential direction around the rotation operation shaft 880. In the first member 61, only the first holding hole 852a into which the lock pin 856 is slidably inserted is formed. The lock pin 856 is provided with a spring urging tool 843 that applies an elastic load to the withdrawal of the lock pin 856 and returns the lock pin 856 to the home position when the withdrawal force disappears.

  In the lock position of the rotation lock body 82, the first through hole 855a and the first holding hole 852a of the lock holding plate 855 are arranged on the coaxial core, and the lock pin 856 connects the first holding hole 852a and the first through hole 855a. To penetrate. Thereby, the lock position of the rotation lock body 82 is maintained. At the unlocking position of the rotation lock body 82, the second through hole 855b and the first holding hole 852a of the lock holding plate 855 are arranged on the coaxial core, and the lock pin 856 is connected to the first holding hole 852a and the second through hole 855b. To penetrate. Thereby, the unlocking position of the rotation lock body 82 is maintained. That is, in this other embodiment, the lock pin 856 and the first holding hole 852a function as the lock holding body 85.

  When the mower unit according to the present invention is equipped with the mower unit 4 on the airframe, the mower unit 4 travels over the mower unit 4 placed horizontally on the ground. For this reason, the blade housing 40 is provided with a climbing mechanism 5. As shown in FIGS. 5 and 10, the climbing mechanism 5 is prepared for each of the left and right front wheels 2a, and the interval thereof corresponds to the front wheel tread width. The climbing mechanism 5 extends above the belt transmission mechanism 44c disposed on the top plate 41 of the blade housing 40 in the front-rear direction, and extends obliquely from the front end of the bridge portion 50 toward the ground. It consists of a front auxiliary plate 51 and a rear auxiliary plate 52 extending obliquely from the rear end of the bridge portion 50 toward the ground. The width of the bridge portion 50 is set so as to avoid interference with the subframe 20 and to stably ride the left and right front wheels 2a.

  In order to equip the lower abdomen of the tractor with the mower unit 4, first, the elevating link mechanism 3 is operated to lower the intermediate frame 6 to the lower limit position. Next, the front wheel 2 a is moved forward from behind the mower unit 4, and the body is advanced so that it passes over the blade housing 40 and gets over the blade housing 40. When the front wheel 2a gets over the blade housing 40, the engaged portion 620 provided in the blade housing 40 and the engaging portion 610 provided in the intermediate frame 6 are engaged. After the front wheel 2a gets over the blade housing 40, the aircraft is stopped.

  After the airframe is stopped, the operator swings the operation lever 83 to bring the blade power transmission mechanism 25 into a connected state where power can be transmitted. Further, the rotation operation body 84 and the lock holding body 85 are operated to hold the rotation lock body 82 at the lock position.

  When the mower unit 4 is detached from the airframe, after the elevator link mechanism 3 is lowered so that the mower unit 4 is grounded, the driver operates the operation lever 83 to bring the blade power transmission mechanism 25 into the detached state. To do. Further, the rotation operation body 84 and the lock holding body 85 are operated to hold the rotation lock body 82 in the unlocked position. Next, the front wheel 2 a uses the climbing mechanism 5 from the front of the mower unit 4, and the airframe is moved backward so that it passes over the blade housing 40 and climbs over the blade housing 40. Through this backward movement, the engaging portion 610 provided in the intermediate frame 6 comes out of the engaged portion 620 provided in the blade housing 40. When the front wheel 2a gets over the blade housing 40, the mower unit 4 becomes free and can be carried out freely.

  In the embodiment described above, the lock unit LU employs the rotation type lock mechanism including the lock fixing rod 80, the rotation operation shaft 880, and the rotation lock body 82. However, other lock mechanisms may be employed. It is. Depending on the configuration of the lock mechanism, the structure of the rotating operation body 84 and the lock holding body 85 is changed.

  The engagement structure of the engaging portion 610 provided in the intermediate frame 6 and the engaged portion 620 provided in the blade housing 40 for connecting the intermediate frame 6 and the blade housing 40 is based on forward travel of the airframe. Any type of engagement other than the hole-pin engagement type, such as a claw engagement type, can be used as long as it engages by approaching in the longitudinal direction of the machine and disengages by separation in the longitudinal direction of the machine. These may be mixed. The engagement connection points created by the engagement portion 610 and the engaged portion 620 are four places on the front, rear, left and right in the above-described embodiment, but may be two or more.

  The present invention can be applied to a lawn mower equipped with various mower units 4 configured to be able to ride over the left and right front wheels in a detachable manner between the front wheels and the rear wheels. There is no limit.

2a: front wheel 2b: rear wheel 3: lifting link mechanism 4: mower unit 5: climbing mechanism 10: main frame 20: subframe 20a: left subframe member 20b: right subframe member 31: front link 32: rear link 39: Link pin 40: Blade housing 6: Intermediate frame 61: First member 610: Engaging portion 62: Second member 620: Engaged portion 8: Lock mechanism 80: Locking fixing rod 82: Rotating lock body 83: Operation Lever 84: Rotating operation body 85: Lock holder 841: Arm member 842: Lock pin 842a: First leg 842b: Second leg 842c: Arch portion 843: Spring biasing tool 852a: First holding hole 852b: Second Holding hole 855: Lock holding plate 855a: First through hole 855b: Second through hole 856: Lock pin 880: Time Dynamic operation axis FL: Front loader device LU: Lock unit

Claims (7)

A mid-mount mower equipped with a mower unit between the front and rear wheels below the fuselage,
A mainframe extending in the longitudinal direction of the aircraft,
A lifting link mechanism for hanging the mower unit, including a front link and a rear link;
An intermediate frame attached to the lifting link mechanism;
An engaging portion provided in the intermediate frame;
An engaged portion that is provided on a blade housing of the mower unit and that engages with the engaging portion as the front wheel moves over the mower unit in the front-rear direction;
A rotation lock body that rotates between a lock position that locks the intermediate frame and the blade housing and an unlock position in an engaged state between the engagement portion and the engaged portion;
A rotation operation body provided inside the intermediate frame and for rotating the rotation lock body;
A lock holding body that is provided inside the intermediate frame and holds the lock position of the rotation lock body;
Mid-mount mower with   The mid-mount mower according to claim 1, wherein the rotating operation body and the lock holding body are integrally configured.   The lock holding body is a lock pin that is supported by an arm member fixed to a rotation operation shaft and can be inserted into a holding hole provided in the intermediate frame at a lock position, and the lock pin, the arm member, The mid-mount mower according to claim 2, which constitutes the rotating operation body.   4. The mid-mount mower according to claim 3, wherein the lock pin has a portion that is bent in a U shape and is inserted into a guide hole provided in the intermediate frame.   The mid-mount mower according to claim 1, wherein the rotating operation body and the lock holding body are arranged separately. The rotation operation body is a lever member fixed to the rotation lock body,
The mid-mount mower according to claim 5, wherein a lock holding plate fixed to the rotation lock body and a lock pin that can be inserted into a holding hole provided in the lock holding plate constitute the lock holding body. Subframes extending both outside in the transverse direction of the main frame are provided,
The mid-mount mower according to any one of claims 1 to 6, wherein the pair of left and right climbing mechanisms are arranged on the top plate of the blade housing and at a position that does not overlap the subframe in plan view. .

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