JP4266205B2 - Rotary cover - Google Patents

Description

  The present invention relates to a rotary cover.

  In a rotary cover that includes a main cover that covers the top of the tilling portion of the rotary tiller and a rear cover that is pivotally connected to the main cover so as to cover the rear of the tilling portion, the rear cover is disposed behind the tilling portion. In addition to leveling the soil, a pair of extended rear covers are pivotally connected to both ends of the rear cover in the vehicle width direction, and the pair of extended rear covers are extended outwardly with respect to the vehicle width direction as a reference. And a closed position stored in the rear cover. The pair of extended rear covers are positioned in the open position for tilling work, and the ground surface is wider than the working width of the rear cover. Conventionally, leveling and leveling have been performed to eliminate joints in work processes.

  By the way, in the rotary cover provided with the extended rear cover as described above, when there is an obstacle such as a shore part or a power pole during field work, the extended rear cover is moved to a closed position where it does not protrude from the rear cover to reduce the overall width. There are things to do. At this time, the operator gets off the work vehicle and closes the extension rear cover to the closed position, gets on the work vehicle again to perform the tilling work, and when the obstacle disappears, gets off the work vehicle and extends again. There is a problem in that it is necessary to perform an operation of opening the rear cover to the open position, and further get on the work vehicle to perform a tilling operation, and the opening / closing operation of the extended rear cover between the open position and the closed position is troublesome.

Therefore, one end of the rope is attached to the extension rear cover via a support rod so that the operator can open and close the extended rear cover between the open position and the closed position without getting off the work vehicle, and the other end of the rope is attached to a plurality of ends. It is attached to an operating rod provided with a protrusion, and the operating rod is slidably inserted into a long hole of a support rod protruding from the support arm in the width direction of the work vehicle, so that the extended rear cover can be opened and closed. A configuration that enables remote operation of opening and closing has been proposed (see Patent Document 1).
Japanese Utility Model Publication No. 55-4965

  However, in the configuration as described above, since the support rod protrudes in the working vehicle width direction, the configuration for opening and closing the extended rear cover is enlarged, and in order to slide the operation rod, Then, the operating rod is once rotated substantially at right angles in the long hole of the support rod to release the engagement between the support rod and the projection of the operating rod, and then the operating rod is slid in the long hole of the support rod, and then the operating rod By rotating the support rod at a substantially right angle again within the long hole of the support rod, an operation of engaging the support rod and the projection of the operating rod must be performed, and the operability is not good.

  The present invention has been made in view of the above-described prior art, and allows the operator to open and close the extended rear cover between the open position and the closed position with a compact configuration and good operability without the operator getting off the work vehicle. It is an object of the present invention to provide a rotary cover that can be used.

  In order to solve the above-described problem, the present invention provides a rotary cover that covers a tillage part supported by a lift arm provided in the main body of a working vehicle via an upper arm, and covers a top of the tillage part. A rear cover rotatably connected to the main cover so as to cover the rear of the tillage portion, and a pair of extended rear covers rotatably connected to both ends of the rear cover in the vehicle width direction. With respect to the width direction, a pair of extended rear covers capable of taking an open position extended outward with respect to the rear cover, and a closed position stored in the rear cover, and the pair of extended rear covers are opened or closed, respectively. A pair of first urging members for urging toward any one of the reference positions, and the pair of extension rear covers so that the pair of extended rear covers can be opened and closed. An operating member linked to the extended rear cover, and the operating member is an operating shaft supported by the upper arm so as to be rotatable about the axis and slidable in the axial direction, and is positioned at the first position around the axis. The pair of extended rear covers are positioned at the reference position, and the pair of extended rear covers are positioned at the operation position opposite to the reference position when positioned at the second position around the axis. An operating shaft operatively connected to the extended rear cover via a link member, and a stay provided on the operating shaft so as to face the upper arm, the engaging shaft being engaged with an engaged portion provided on the upper arm. And a second urging member that urges the stay toward the upper arm, and the engaging portion and the engaged portion are Control When the shaft is positioned at the second position around the axis, the pair of extended rear covers are engaged with the operating position, and the operating shaft is moved in the direction in which the stay is separated from the upper arm. A rotary cover is provided that is configured to be disengaged when slid along the axial direction against an urging force of an urging member.

  In the rotary cover according to the present invention, when the operation shaft is positioned at the first position around the axis, the pair of extended rear covers are moved to the open position or the closed position by the urging force of the pair of first urging members, respectively. It is located at one of the reference positions. In this state, when the operator rotates the operation shaft supported by the upper arm around the axis toward the second position, the pair of extended rear covers respectively resist the urging force of the pair of first urging members. Then, it rotates to the side of the operating position (the other position) opposite to the reference position (one of the open position and the closed position). At this time, the upper arm is in a position that the operator can reach while riding on the work vehicle, and since the operation shaft to be operated is supported by the upper arm, the operator does not have to get off the work vehicle. . When the operation shaft is further rotated and positioned at the second position around the axis, the pair of extended rear covers are respectively disposed at the operating positions (the other position among the open position and the closed position). At this time, the operating shaft slides along the axial direction, and the engaging portion in the stay provided on the operating shaft so as to face the upper arm, and the engaged portion in the upper arm Are engaged by the urging force of the second urging member, and the pair of extended rear covers are locked to the operating position (the other position among the open position and the closed position). As a result, the pair of extended rear covers are each held in the operating position (the other position). On the other hand, when the operator slides the operation shaft supported by the upper arm along the axial direction in a direction away from the upper arm against the urging force of the second urging member, The engagement between the engaging portion and the engaged portion is released. At this time as well, the operator does not have to get off the work vehicle. Then, the operating shaft is rotated around the axis toward the first position by the biasing force of the pair of first biasing members, and the pair of extended rear covers are respectively moved to the reference position (one of the open position and the closed position). ).

  As described above, according to the rotary cover according to the present invention, the operator can operate the operation shaft provided on the upper arm without having to get off the work vehicle. Can be opened and closed. Further, the operation shaft is supported by the upper arm so as to be rotatable about the axis and slidable in the axial direction, and a member such as a support bar does not protrude in the working vehicle width direction as in the prior art. The configuration for opening and closing the pair of extended rear covers can be made compact, and the operator can rotate the operation shaft around the axis or slide it along the axial direction. Since the extension rear cover can be opened and closed, the operability can be improved as compared with the prior art. Therefore, the opening / closing operation between the open position and the closed position of the extension rear cover can be performed with a compact configuration and good operability without the operator getting off the work vehicle.

  In the rotary cover according to the present invention, it is preferable that the operation member has an operation lever provided on the operation shaft. By doing so, the operation lever can be easily rotated by the operation lever, and the operability for opening and closing the pair of extended rear covers can be further improved. In this configuration, the operation lever can be exemplified as being disposed on the opposite side of the stay with the upper arm interposed therebetween.

  In the present invention, the upper arm includes one upper arm or a pair of upper arms. That is, the rotary cover according to the present invention may be supported via a single upper arm on a lift arm provided on the machine of the work vehicle, or a pair of lift arms provided on the machine of the work vehicle. It may be supported via an upper arm.

  In the rotary cover according to the present invention, the operation shaft may be a single operation shaft or a pair of operation shafts. When the upper arm is a single upper arm, the operation shaft is a single operation shaft that is supported by the single upper arm so as to be rotatable about the axis and slidable in the axial direction. The pair of extended rear covers are positioned at the reference position when positioned at the second position, and the pair of extended rear covers are positioned at the operating position when positioned at the second position around the axis. A pair of operation shafts supported by the one upper arm so as to be rotatable about an axis and slidable in the axial direction, respectively. The pair of extended rear covers are positioned at the reference position when positioned around the first position, and the pair of extended rear covers are positioned when positioned at the second position around the axis. So as to be positioned at a position, or a pair of the operating shaft which is operatively connected to the extension rear cover via the link member.

  Further, when the upper arm is a pair of upper arms, the operation shaft is a single operation shaft supported on at least one of the pair of upper arms so as to be rotatable about an axis and slidable in the axial direction. The pair of extended rear covers are positioned at the reference position when positioned at the first position around the axis, and the pair of extended rear covers are positioned at the operating position when positioned at the second position around the axis. As described above, one operating shaft operatively connected to the extended rear cover via the link member may be used, or a pair of operations supported by the pair of upper arms so as to be rotatable about an axis and slidable in the axial direction. The pair of extended rear covers are positioned at the reference position and are positioned at the second position around the axis when positioned at the first position around the axis. The like a pair of extension rear cover is positioned at the operating position, it may be a pair of the operating shaft which is operatively connected to the extension rear cover via the link member.

  The stay may be one stay or a pair of stays. For example, when the operation shaft is one operation shaft, the stay is one stay provided on one operation shaft so as to face the upper arm, and the engagement portion is provided on the one stay. May be. In the case where the operation shaft is a pair of operation shafts, the stays are a pair of stays provided on the pair of operation shafts so as to face the upper arm, respectively. A joint may be provided.

  The operation shafts are a pair of operation shafts supported by the upper arm so as to be rotatable about an axis and slidable in the axial direction, and the pair of operation shafts are located at a first position around the axis, respectively. The pair of extended rear covers are positioned at the reference position, and the pair of extended rear covers are positioned at the operation position opposite to the reference position when the pair of extended rear covers are positioned at the second position around the axis. And the stay is a pair of stays provided on the pair of operation shafts so as to face the upper arm, and the pair of stays includes a pair of stays, respectively. A pair of upper upper members, each of which is provided with an engaging portion that can be engaged with an engaged portion provided on the arm, wherein the upper arm is disposed to be opposed to each other at a predetermined interval. Each of the pair of operation shafts is supported by the corresponding upper arm such that the corresponding stay is positioned between the pair of upper arms, and the second biasing member is Preferably, it is disposed between the pair of upper arms. By doing so, the configuration for opening and closing the pair of extended rear covers can be further reduced in size. In order to achieve further compactness, for example, the pair of operating shafts are arranged coaxially, and the second urging member is a single member arranged between the pair of stays. It is preferable that

  In the rotary cover according to the present invention, a typical example of the link member is a wire. Moreover, as an engaged part provided in the said upper arm, a hole or a protrusion can be illustrated, and a protrusion or a hole can be illustrated as an engaging part provided in the said stay which can be engaged with the said engaged part. .

  As described above, according to the rotary cover according to the present invention, even if the operator does not get off the work vehicle, the open position and the closed position of the pair of extended rear covers can be simply operated by operating the operation shaft provided on the upper arm. Can be opened and closed. Further, the operation shaft is supported by the upper arm so as to be rotatable about the axis and slidable in the axial direction, and a member such as a support bar does not protrude in the working vehicle width direction as in the prior art. The configuration for opening and closing the pair of extended rear covers can be made compact, and the operator can rotate the operation shaft around the axis or slide it along the axial direction. Since the extension rear cover can be opened and closed, the operability can be improved as compared with the prior art.

  Moreover, in the rotary cover according to the present invention, when the operation member has an operation lever provided on the operation shaft, the operation lever can facilitate the rotation operation of the operation shaft. Accordingly, the operability for opening and closing the pair of extended rear covers can be further improved.

  Further, the operating shaft is a pair of operating shafts supported by the upper arm so as to be rotatable about the axis and slidable in the axial direction, and the pair of operating shafts are respectively located at the first position around the axis. The pair of extended rear covers are positioned at the reference position, and the pair of extended rear covers are positioned at the operating position when the pair of extended rear covers are positioned at the second position around the axis. The stay is operatively connected to an extended rear cover, and the stay is a pair of stays provided on the pair of operating shafts so as to face the upper arm, and the pair of stays are provided on the upper arm, respectively. In this case, the upper arms are a pair of upper arms arranged to face each other at a predetermined interval. The pair of operation shafts are supported by the corresponding upper arms so that the corresponding stays are positioned between the pair of upper arms, and the second biasing member is By being disposed between the upper arms, the configuration for opening and closing the pair of extended rear covers can be further reduced in size. In this case, when the pair of operating shafts are arranged coaxially and the second urging member is a single member arranged between the pair of stays, further compactification is achieved. Can be realized, and the part cost can be reduced accordingly.

  Hereinafter, preferred embodiments of a rotary cover according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing a state in which a rotary tiller 100 to which a rotary cover 200 according to the embodiment of the present invention is applied is attached to the main body of a work vehicle A, and FIG. 2 is a rotary tiller 100 in FIG. FIG. 3 is a side view centering on the portion, and FIG. 3 is a plan view centering on the rotary tiller 100 portion in FIG.

  First, the configuration of the working vehicle A will be described with reference to FIGS. 1 to 3. In the tractor as the working vehicle A, a bonnet 106 is disposed at the front of the main body that suspends the front wheel 101 and the rear wheel 102 in the front and rear, and the engine 105 is disposed inside the bonnet 106. A main speed change lever 77 projects from the side of the seat 98, and a steering handle 10 is disposed in front.

  A transmission case 109 is disposed behind the engine 105 and is configured to transmit power from the engine 105 to the transmission case 109 to change speed and transmit driving force to the rear wheel 102 and the front wheel 101. Has been. Further, a part of the power from the engine 105 is transmitted to the rotary tiller 100 through the universal joint 63 or the like from the PTO shaft 15 protruding from the rear surface of the transmission case 109 and driven.

  The rotary tiller 100 is mounted on the rear portion of the working vehicle A via a work machine mounting device A ′. The work implement mounting apparatus A ′ is composed of a top link 61, a lower link 62, and the like, and a lift rod (see FIG. 5) is projected to a lift arm 79 protruding from a hydraulic case (not shown) disposed on the mission case 109. The rotary tiller 100 can be rotated up and down by rotating the lift arm 79. In addition, a one-touch type mounting mechanism is provided at the rear part of the work machine mounting apparatus A ′ so that the rotary tiller 100 can be easily attached and detached.

  Next, the configuration of the rotary tiller 100 will be described. The rotary tiller 100 has a gear case 5 disposed at the center upper portion in the vehicle width direction, and has an input shaft protruding forward from the gear case 5, and the input shaft is connected with the universal joint 63 and the like. It is connected to the PTO shaft 15. Main beams 127 and 127 are provided on both sides of the gear case 5 so as to protrude on both sides in the vehicle width direction (X direction in FIG. 3). The chain case 6 and the side support 126 are provided at the ends of the main beams 127 and 127, respectively. The tilling claw shaft 8 is laid across the chain case 6 and the lower side of the side support 126. On the tillage claw shaft 8, tillage claws (not shown) are radially arranged at predetermined intervals, and the tillage claw is transmitted to the tillage claw shaft 8 from a power transmission mechanism in the gear case 5. It is configured to be driven to rotate by the motive power.

  Further, a rotary cover 200 is provided on a portion of the chain case 6 and the side support 126 that supports the tilling claw shaft 8 below. The rotary cover 200 is supported via an upper arm 75 (in this embodiment, a pair of left and right upper arms arranged to face each other) with respect to the lift arm 79 provided in the main body of the working vehicle A. And includes a main cover 210, a rear cover 220, a pair of left and right extended rear covers 230, a pair of left and right first urging members 240, and an operation member 250.

  The main cover 210 covers the top of the tillage portion 7 and is supported by the chain case 6 and the side support 126 at both ends in the vehicle width direction X. The rear cover 220 is rotatably connected to the main cover 210 so as to cover the rear of the tillage unit 7. More specifically, the rear cover 220 has a leveling member 221 for leveling the soil behind the tillage portion 7, and the leveling member 221 moves up and down in response to changes in the height of the soil. The main cover 210 is pivotably connected to the main cover 210 via a pivot shaft 72 so as to be movable.

  On the rear part of the main cover 210, a pair of sliding support brackets 29, 29 are provided upright rearward. Lower ends of a pair of hanger rods 125 and 125 are pivotally supported on the upper surface of the rear cover 220, and upper portions of the hanger rods 125 and 125 are slidably supported on upper portions of the sliding support brackets 29 and 29, respectively. Has been. The hanger rods 125, 125 are externally fitted with springs, and are configured to urge the rear cover 220 toward the rear cover 220 so that the rear cover 220 can follow the unevenness of the ground surface during operation. Yes.

  FIG. 4 is a perspective view showing a schematic configuration of the pair of left and right extended rear covers 230 in the rotary cover 200 shown in FIGS. In FIG. 4, the pair of left and right extended rear covers 230 and the pair of left and right first biasing members 240 show only one side (left side in the figure), but the configuration on the other side (right side in the figure) The configuration on the one side is only bilaterally symmetric, and the configuration is substantially the same as the configuration on the one side. Therefore, the illustration of the configuration on the other side is omitted here, and is shown as a representative in the diagram on the one side. The same applies to FIG. 7 described later.

  As shown in FIG. 4, the pair of left and right extended rear covers 230 are rotatably connected to both ends of the rear cover 220 in the vehicle width direction (X direction in the figure). As a reference, an open position extended outward and a closed position stored in the rear cover 220 can be taken. More specifically, at both ends in the vehicle width direction X of the rear cover 220 and the ends of the pair of left and right extended rear covers 230 on the rear cover 220 side, the first and second hinge portions 231 having a “U” shape in a plan view, respectively. 232 is provided, and the first and second hinge portions 231 and 232 are overlapped with each other at the end portions 231a and 232a so as to face the open end portions 231a and 232a, and can be rotated via the rotation shaft 51. It is connected to. As a result, the pair of left and right extended rear covers 230 can rotate so as to be able to take the open position and the closed position at both ends of the rear cover 220 (in the Z1 direction and the Z2 direction, respectively). .

  The pair of left and right first biasing members 240 bias the pair of left and right extended rear covers 230 toward the reference position of either the open position or the closed position (open position in the present embodiment). Here, it consists of a spring. More specifically, the winding spring 240 has both end portions 241 and 242 projecting from the winding portion by a predetermined amount, one end portion 241 is locked to the first hinge portion 231, and the other end portion 242 is locked to the second hinge portion 232. In this state, the winding portion is fitted into the rotating shaft 51. Accordingly, the pair of left and right extended rear covers 230 can be biased toward the reference position of the open position.

  FIG. 5 is a side view for explaining a schematic configuration of the operation member 250 in the rotary cover 200 shown in FIGS. 1 to 3. FIG. 6 is a view for explaining the operation of the operation member 250. FIGS. 6A and 6B show the state in which the operation member 250 is located at the first position around the axis. FIGS. 6C and 6D are a side view and a plan view, respectively, showing a state where the operation member 250 is located at the second position around the axis. In addition, in FIG. 3, the link member 260 and the like which will be described later are not shown.

  The operation member 250 is linked to the pair of extended rear covers 230 via a link member 260 so that the pair of left and right extended rear covers 230 can be opened and closed, and includes an operation shaft 251, an operation lever 252, a stay 253, and the like. A second urging member 254 is provided.

  In this embodiment, the operation shaft 251 is a pair of left and right supported by the pair of left and right upper arms 75 so as to be rotatable about an axis and slidable in the axial direction. Specifically, each of the pair of left and right operation shafts 251 is a bottomed cylindrical member extending in the vehicle width direction X, and the sliding shaft 251a extending in the vehicle width direction X is rotated about the axis from the opening. Each of the left and right upper arms 75 is inserted into a through-hole 75 'penetrating in the vehicle width direction X and freely rotatable about the axis and slidable in the axial direction. It is inserted. Thus, the pair of upper arms 75 can support the pair of operation shafts 251 so as to be rotatable about the axis and slidable in the axial direction. The pair of upper arms 75 are respectively provided with engaged portions 75a that engage with engaging portions 253a provided on the stay 253. In the present embodiment, the pair of operation shafts 251 are arranged coaxially.

  The stay 253 is a pair of left and right provided on the pair of left and right operation shafts 251 so as to face the pair of left and right upper arms 75, respectively, and one end portion with the operation shaft 251 in between. The engaging portion 253a is provided at 253 ′, and a connecting portion 253b connected to a wire 261 described later of the link member 260 is provided at the other end portion 253 ″. Each of the pair of operation shafts 251 is supported by the corresponding upper arm 75 such that the corresponding stay 253 is positioned between the pair of upper arms 75. The pair of upper arms 75 respectively The provided engaged portions 75a are holes extending along the vehicle width direction X, and the engaging portions provided on the stays 253, respectively. 53a is a projection extending along the vehicle width direction X.

  The operation lever 252 is a pair of left and right provided on the pair of left and right operation shafts 251, respectively, and the operation lever 252 is disposed on the opposite side of the pair of left and right stays with the pair of left and right upper arms 75 interposed therebetween. It arrange | positions so that it may extend in radial direction outward on the basis of the axis line of the axis | shaft 251. FIG.

  The link member 260 is a pair of left and right members that connect the other end 253 ″ of the pair of left and right stays 253 and the second hinge portion 232 of the pair of left and right extended rear covers 230, respectively. And a wire tube 262 that slidably passes through the wire 261. The wire tube 262 is supported at one end by a support member 91 provided on the rear cover 220 (see FIG. 4). The other end is supported by a support member 92 provided in the vicinity of the upper arm 75 (see FIGS. 5 and 6), and one end of the wire 261 is provided on the second hinge portion 232. A projecting portion 232b, which is connected to the projecting portion 232b extending outward in the radial direction with respect to the axis of the pivot shaft 51, having a U-shaped cross section. The other end of the stay 253 is connected to a connecting portion 253b provided on the other end 253 ″ of the stay 253 so as to be rotatable about the axis via a material 261a. (See FIGS. 5 and 6.) At this time, when the pair of left and right operation shafts 251 is positioned at the first position around the axis, respectively (see FIGS. 6A and 6B), When the pair of extended rear covers 230 are positioned at the reference position of the open position and are positioned at the second position around the axis (see FIGS. 6C and 6D), the pair of extended rear covers 230 are It is operatively connected to the extended rear cover 230 via the link member 260 so as to be located at an operating position (closed position in the present embodiment) opposite to the reference position.

  The second urging member 254 urges the pair of left and right stays 253 toward the pair of left and right upper arms 75 (in the X1 direction in FIG. 6B). Here, the second urging member 254 is formed of a winding spring, and is disposed between the pair of left and right upper arms 75 while being fitted to the sliding shaft 251a. Accordingly, the pair of left and right stays 253 can be urged toward the pair of left and right upper arms 75, respectively. In the present embodiment, the winding spring 254 is a single member disposed between the pair of stays 253 in the pair of operation shafts 251 disposed coaxially.

  The engaging portions 253a provided on the pair of left and right stays 253 and the engaged portions 75a provided on the pair of left and right upper arms 75 respectively include the pair of left and right operation shafts 251 around the axis. The pair of left and right extended rear covers 230 are engaged with each other when they are located at the two positions (see FIGS. 6C and 6D), and the pair of stays are locked. The pair of operation shafts 251 are moved along the axial direction X against the urging force of the second urging member 254 in a direction (X2 in FIG. 6D) in which the 253 is separated from the pair of upper arms 75. When it is slid, it is configured to be disengaged as shown in FIGS. 6 (A) and 6 (B).

  Meanwhile, the rotary cover 200 is configured to close the pair of extended rear covers 230 urged toward the open position by the pair of first urging members 240 to the closed position by the wire 261. However, for example, when a trouble such as the wire 261 being cut occurs for some reason, the pair of extended rear covers 230 are always in the open position, which may interfere with the work. . Therefore, in the rotary cover 200, as shown in FIG. 4, the first and second hinges 231 and 232 are connected to through holes 231 ′ and 232 that communicate with the pair of extended rear covers 230 when closed in the closed position. , And with the pair of extended rear covers 230 closed, the pair of extended rear covers 230 is held in the closed position by inserting locking members 93 such as pins into the through holes 231 ′ and 232 ′. To be. By doing so, even if a trouble such as the wire 261 being cut for some reason occurs, the pair of extended rear covers 230 can always be in the closed position so as not to disturb the work, Thereby, the work can be performed satisfactorily.

  In the rotary cover 200, the rear cover 220 includes a pair of left and right side rear covers 222 that are separated from each other at both ends where the pair of extended rear covers 230 are disposed. However, as shown to FIG. 7 (A), it can attach or detach with respect to the said rear-cover 220 main body, respectively. More specifically, each of the rear cover 220 body is provided with a locking hole 220a for removably engaging the engaging portions 222a provided on the pair of side rear covers 222, and spaced apart from the locking hole 220a. A screwing pin 220b disposed at a position is provided. As described above, each of the pair of side rear covers 222 has an engaging portion 222a that engages with the locking hole 220a of the main body of the rear cover 220. The engaging portions 222a are arranged in the vehicle width direction X. The extended rear cover 230 is disposed on the opposite side and extends along the direction X. Each of the pair of side rear covers 222 is provided with a through hole 222b through which a screwing pin 220b provided in the rear cover 220 body is inserted.

  In the rotary cover 200 configured as described above, the side rear cover 222 has the engaging portion 222a engaged with the locking hole 220a of the rear cover 220 main body, and the through hole 222b formed of the rear cover 220 main body. The knob nut 93 can be attached to the main body of the rear cover 220 by being screwed into the screw pin 220b while being inserted into the screw pin 220b.

  By the way, when working with a working machine such as a piece of clay, the side rear cover 222 provided with the extended rear cover 230 may be in the way by the wheels of the working machine. The rear cover 220 may be removed from the main body, and the side rear cover 222 may be placed outside the field for work. In this case, it is necessary to go to the outside of the field to remove the side rear cover 222 each time when the work machine such as one piece of soil is frequently changed, and the work of changing the work machine such as one piece of soil is complicated. Become.

  Therefore, in the rotary cover 200, as shown in FIG. 7B, the pair of side rear covers 222 provided with the pair of extended rear covers 230 are fixedly arranged on the main cover 210, respectively. More specifically, the main cover 210 is supported by an engaging member 210a (for example, a cylindrical collar 210a) that removably engages the engaging portions 222a provided on the pair of side rear covers 222, respectively. In addition to being provided through the member 210c, a screwing pin 210b is provided through which the through hole 222b provided in the pair of side rear covers 222 is inserted. Accordingly, in the pair of side rear covers 222, the engaging portions 222a are engaged with the collars 210a of the main cover 210, and the through holes 222b are inserted into the screwing pins 210b of the main cover 220. In this state, the knob nut 93 can be attached to the main cover 210 by being screwed onto the screwing pin 210b. In this way, when attaching work machines such as single-sided soil, the side rear cover 222 that is not required is fixedly arranged on the main cover 210, so that even if the work machine is frequently replaced, the side There is no need to take the rear cover 222 out of the field, and this makes it possible to improve the workability of replacing work implements such as single-sided soil.

  In the rotary cover 200 described above, when the operation shaft 251 is positioned at the first position around the axis (see FIGS. 6A and 6B), the pair of extended rear covers 230 are respectively connected to the pair of extension covers 230. Due to the urging force of the first urging member 240, the first urging member 240 is positioned at the reference position of the open position. In this state, when the operator rotates the operation shaft 251 supported by the upper arm 75 toward the second position around the axis (in the direction of arrow Y1 in FIG. 6A), the pair of extended rear covers 230 are Each of the pair of first biasing members 240 rotates against the biasing force of the pair of first biasing members 240 toward the operating position of the closed position opposite to the reference position of the open position. At this time, the upper arm 75 is in a position where the operator can reach the work vehicle A and the operation shaft 251 to be operated is supported by the upper arm 75, so that the operator gets out of the work vehicle A. It does not have to be. When the operation shaft 251 is further rotated and positioned at the second position around the axis (see FIG. 6C and FIG. 6D), the pair of extended rear covers 230 are respectively moved to the operating positions of the closed position. Be placed. At this time, the operating shaft 251 slides along the axial direction, and the engaging portion 253a of the stay 253 provided on the operating shaft 251 so as to face the upper arm 75, and the upper arm 75 The engaged portion 75a is engaged by the urging force of the second urging member 254, and the pair of extended rear covers 230 are locked at the operating position of the closed position. As a result, the pair of extended rear covers 230 are each held in the operating position of the closed position. On the other hand, the stay 253 moves the upper shaft 751 against the urging force of the second urging member 254 (in the direction of the arrow X1 in FIG. 6B) with the operation shaft 251 supported by the upper arm 75. When sliding along the axial direction in the direction away from the arm 75 (the arrow X2 direction in FIG. 6D), the engagement between the engaging portion 253a and the engaged portion 75a is released. Also at this time, the operator does not have to get off the work vehicle A in the same manner as described above. Then, the operating shaft 251 rotates around the axis toward the first position (in the direction of arrow Y2 in FIG. 6C) by the biasing force of the pair of first biasing members 240, and the pair of extended rear covers 230 Each is returned to the reference position of the open position.

  As described above, according to the rotary cover 200, even if the operator does not get off the work vehicle A, the opening and closing positions of the pair of extended rear covers 230 can be closed only by operating the operation shaft 251 provided on the upper arm 75. Opening and closing operation with the position can be performed. Further, the operation shaft 251 is supported by the upper arm 75 so as to be rotatable about the axis and slidable in the axial direction, and a member such as a support rod does not protrude in the work vehicle width direction X as in the prior art. Therefore, the configuration for opening and closing the pair of extended rear covers 230 can be made compact, and only an operation in which the operator rotates the operation shaft 251 around the axis line or slides along the axial direction. Therefore, since the opening / closing operation of the pair of extended rear covers 230 can be performed with one touch, complicated operations are unnecessary and easy to understand, and operability and comfort can be improved as compared with the conventional one. Therefore, the opening / closing operation of the extended rear cover 230 between the open position and the closed position can be performed with a compact configuration and good operability without the operator getting off the work vehicle A.

  In the rotary cover 200, since the operation shaft 251 is provided with the operation lever 252, the operation lever 252 can easily rotate the operation shaft 251. The operability for opening and closing the pair of extended rear covers 230 can be further improved.

  Further, the pair of operation shafts 251 are respectively supported by the corresponding upper arms 75 such that the corresponding stays 253 are positioned between the pair of upper arms 75, and the second urging member 254 is Since it is disposed between the pair of upper arms 75, the structure for opening and closing the pair of extended rear covers 230 can be made more compact. The pair of operation shafts 251 are coaxially disposed, and the second urging member 254 is a single member disposed between the pair of stays 253. Compactness can be realized, and the part cost can be reduced accordingly.

  In the present embodiment, the pair of operation shafts 251 are supported by the corresponding upper arms 75 so that the corresponding stays 253 are positioned between the pair of upper arms 75, respectively. Each of the operation shafts 251 may be supported by the corresponding upper arm 75 such that the corresponding stay 253 is positioned outward with respect to the pair of upper arms 75. Further, the engaged portion 75a provided on the upper arm 75 is a hole, and the engaging portion 253a provided on the stay 253 is a protrusion, but the engaged portion 75a of the upper arm 75 is A protrusion may be used, and the engaging portion 253a of the stay 253 may be a hole.

  In this embodiment, although the point which performs remote operation of opening and closing of the said extension rear cover 230 using link members 260, such as a wire, was demonstrated separately from a rotary tiller, without using link members, such as a wire, for example. It is conceivable to remotely open and close the extended rear cover using the remote control assisting tool. This will be described below with reference to FIG.

  FIG. 8 is a view showing an example 300 of an auxiliary tool for remote operation separated from the rotary tiller, and FIG. 8A is a schematic side view of the auxiliary tool 300 for remote operation. FIGS. 8B and 8C show a state in which the telescopic auxiliary tool 300 that can be expanded and contracted is contracted, and FIG. 8C shows the remote operation auxiliary tool 300 with another attachment attached to the other end. The state is shown.

  As shown in FIG. 8A, the remote operation assisting tool 300 has a stick-like shape, and is provided with a hook portion 301 at one end portion. With this hook portion 301, remote operation for opening and closing the extended rear cover can be performed. Is what you do. Thereby, opening / closing remote operation of an extension rear cover can be performed, without using link members, such as a wire. In addition, the remote operation assisting tool 300 may be configured to be extendable as shown in FIG. By doing so, it can be stored in a work vehicle, a work machine or the like, or in a tool box or the like. Furthermore, the remote operation auxiliary tool 300 can be detachably provided with various attachments 302 (for example, a scraper for soil removal or a sickle) at the other end. 8A and 8B show a scraping scraper, and FIG. 8C shows a sickle. By doing so, in addition to the remote operation of opening and closing the extended rear cover, it is possible to perform auxiliary work such as soil removal and mowing with the attachment 302.

FIG. 1 is a side view showing a state where a rotary tiller to which a rotary cover according to an embodiment of the present invention is applied is attached to a main body of a working vehicle. FIG. 2 is a side view mainly showing the rotary cultivator portion in FIG. 1. FIG. 3 is a plan view mainly showing the rotary cultivator portion in FIG. 1. FIG. 4 is a perspective view showing a schematic configuration of a pair of left and right extended rear cover portions in the rotary cover shown in FIGS. 1 to 3. FIG. 5 is a side view for explaining a schematic configuration of the operation member in the rotary cover shown in FIGS. 1 to 3. 6A and 6B are diagrams for explaining the operation of the operation member. FIGS. 6A and 6B are side views showing a state in which the operation member is located at the first position around the axis. FIG. 6C and FIG. 6D are a side view and a plan view, respectively, showing a state where the operation member is located at the second position around the axis. FIG. 7A is an exploded perspective view showing a state in which the side rear cover provided with the extended rear cover is detachable from the rear cover main body, and FIG. 7B is a side view provided with the extended rear cover. It is a perspective view which shows the state by which the rear cover is fixedly arrange | positioned at the main cover. FIG. 8 is a diagram showing an example of a remote operation aid that is separate from the rotary tiller, and FIG. 8A is a schematic side view of the remote operation aid. FIGS. 8B and 8C show a state in which the telescopic remote control auxiliary tool is contracted, and FIGS. 8A and 8B show a state in which a soil scraper is attached, FIG. (C) has shown the state in which the sickle was attached.

Explanation of symbols

7 ... Tillage part 79 ... Lift arm 75 ... Upper arm 75a ... Engaged part
200 ... Rotary cover 210 ... Main cover 220 ... Rear cover 220
230 ... A pair of extended rear covers 240 ... A pair of 1st biasing members 250 ... Operation member
251 ... Operation shaft 252 ... Operation lever 253 ... Stay 253a ... Engagement part
254 ... Second urging member 260 ... Link member A ... Working vehicle X ... Vehicle width direction

Claims (5)

A rotary cover that covers a tilling part supported via an upper arm by a lift arm provided in the machine of the working vehicle,
A main cover covering the top of the tillage part;
A rear cover rotatably connected to the main cover so as to cover the rear of the tillage part;
A pair of extended rear covers rotatably connected to both ends of the rear cover in the vehicle width direction, the open position extended outward with respect to the rear cover in the vehicle width direction, and stored in the rear cover A pair of extended rear covers capable of taking a closed position,
A pair of first urging members for urging the pair of extended rear covers toward either the open position or the closed position;
An operation member linked to the pair of extended rear covers via a link member so that the pair of extended rear covers can be opened and closed;
The operating member is
An operation shaft supported by the upper arm so as to be rotatable about an axis and slidable in the axial direction, wherein the pair of extended rear covers are positioned at the reference position when positioned at the first position around the axis, and the axis An operating shaft operatively connected to the extended rear cover via the link member so that the pair of extended rear covers are positioned at an operating position opposite to the reference position when positioned at the second rotation position;
A stay provided on the operation shaft so as to face the upper arm, and a stay provided with an engagement portion engageable with an engaged portion provided on the upper arm;
A second urging member that urges the stay toward the upper arm;
The engaging portion and the engaged portion are engaged when the operation shaft is positioned at the second position around the axis to lock the pair of extended rear covers at the operating position, and the stay is The rotary is configured to be disengaged when the operation shaft is slid along the axial direction against the urging force of the second urging member in a direction away from the upper arm. cover. The operation member has an operation lever provided on the operation shaft,
The rotary cover according to claim 1, wherein the operation lever is disposed on a side opposite to the stay with the upper arm interposed therebetween. The operation shafts are a pair of operation shafts supported by the upper arm so as to be rotatable about an axis and slidable in the axial direction, and the pair of operation shafts are located at a first position around the axis, respectively. The pair of extended rear covers via the link member so that the pair of extended rear covers are positioned at the operating position when the pair of extended rear covers are positioned at the reference position and are positioned at the second position around the axis. Connected to the
The stays are a pair of stays provided on the pair of operation shafts so as to face the upper arms, and the pair of stays can be engaged with engaged portions provided on the upper arms, respectively. The rotary cover according to claim 1, further comprising an engaging portion.   The upper arms are a pair of upper arms arranged to face each other at a predetermined interval, and the pair of operation shafts correspond to each other so that a corresponding stay is located between the pair of upper arms. The rotary cover according to claim 3, wherein the second urging member is supported by an upper arm, and is disposed between the pair of upper arms.   5. The rotary cover according to claim 4, wherein the pair of operation shafts are disposed coaxially, and the second urging member is a single member disposed between the pair of stays. .

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