System, assembly, and method for mounting key plate to be used to lock cab in main body of work machine

Abstract

To provide a technique that relates to a work machine and facilitates accurate positioning of a cab riser and part of a main body of the work machine.SOLUTION: A cab riser 15 includes a cab 14, and a frame having a first plate which comes into contact with a second plate provided on a main body 13 at a first position at which the cab is positioned upright on a work machine 1. The first plate and the second plate are joined to sandwich a key plate at the first position. The key plate is disposed in a space formed with a first concave part on a lower surface of the first plate and a second concave part on an upper surface of the second plate. The second concave part is perpendicularly aligned with the first concave part at the first position. The key plate includes a first contact surface serving as an inclined surface and an upper surface adjacent to the inclined surface in a cross sectional view of the key plate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a work machine, and more particularly to a work machine having a cab and a cab riser tiltably coupled to a main body, as well as a system, an assembly, and a method thereof.

Background Art

[0002] In work machines such as forestry work machines, the driver's cab can be provided at a relatively high position in order to improve the visibility of the work machine. On the other hand, for example, when transporting the machine on a transport trailer, it may be necessary to prevent the driver's cab from exceeding the height of the transport regulations according to the transport regulations. Therefore, on the main body, a cab riser can be provided so as to be tilted forward around a shaft provided in front of the work machine. In the operating position, the cab riser and the cab can be upright and raised by tilting them backward, while the cab riser and the cab can be lowered by tilting them forward toward the work machine in the transport position.

[0003] For the safe operation of the work machine, it may be desirable that the bottom of the rear end of the cab riser is correctly and firmly fixed to the connecting portion of the main body in the operating position. Specifically, accurate positioning of the connecting portion through an easy transition of the work machine from the transport position to the operating position may be desirable.

[0004] Japanese Patent Publication No. 2019-001562 (hereinafter referred to as "Japanese Patent Publication No. 562") describes a system for providing a stacked counterweight attached to a work machine, comprising a plurality of weights stacked vertically. Part or all of the upper surface of each weight is a convex (or concave) upper tapered surface inclined with respect to the horizontal direction, and part or all of the lower surface of each weight is a concave (or convex) lower tapered surface inclined with respect to the horizontal direction, which fits into the upper tapered surface of one of the weights stacked in the layer below. According to Japanese Patent Publication No. 562, the upper tapered surface and the lower tapered surface have a substantially square pyramidal shape, and when the upper weight is lowered onto the lower weight using a crane or the like, the upper tapered surface and the lower tapered surface act as guides, and the weight can automatically be brought into a predetermined fitted state by gravity. Therefore, the upper weight may be lowered onto the lower weight by the rough horizontal positioning of the upper weight relative to the lower weight.

[0005] Furthermore, Japanese Patent Publication No. 2020-026198 (hereinafter referred to as "JP '198") describes a system for attaching an additional counterweight to a work machine, which includes a frustoconical fitting recess that guides the positioning of the additional counterweight on a lower standard counterweight, having a projection corresponding to the fitting recess. Moreover, according to JP '198, the additional counterweight may include an insert nut for fixing the additional counterweight to the lower standard counterweight by inserting a fixing bolt into the insert nut.

[0006] Generally, products with relatively complex protruding shapes, such as double-sided square pyramidal shapes and frustoconical shapes, can be manufactured by casting. However, because such relatively complex shapes are used in structures that require strength to ensure the safety of the work machine, the protrusions may be formed in a way that results in a low material yield. Therefore, it has been desirable to improve material yield while facilitating the precise positioning of parts of the cablifter and work machine body by guides during the transfer of the work machine from the transport position to the operating position.

[0007] Furthermore, if parts of the cab lifter and working machine body are simply fixed by fastening members (e.g., bolts and nuts, or screws), these fastening members may break due to shear forces acting on them when some contact surfaces slide laterally. Therefore, it has been desirable to provide a structure that, in addition to facilitating the positioning of parts of the cab lifter and working machine body by guides during the transfer of the working machine from the transport position to the operating position, prevents or minimizes the shear forces applied to the fastening members, while improving material yield. [Overview of the Initiative]

[0008] According to one embodiment, a working machine is described or provided. The working machine may comprise a body and a cab riser. The cab riser may include a cab and a frame, the cab being positioned upright on the working machine in a first position and tilted forward in a second position, and the frame comprising a first plate that contacts a second plate provided on the body in the first position. The first plate and the second plate can be joined together to sandwich a key plate when the cab is in the first position, the key plate being positioned in the space created by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate in a cross-sectional view of the first plate and the second plate, the second recess being aligned perpendicularly with the first recess when the cab is in the first position, and in a cross-sectional view of the key plate, the key plate may include at least one first contact surface and at least one upper surface as inclined surfaces, the upper surface being adjacent to the inclined surfaces and substantially parallel to the first plate or the second plate perpendicularly.

[0009] In another embodiment, a method is disclosed or implemented. The method may include providing a key plate for a work machine, wherein the key plate has, in a cross-sectional view of the key plate, at least one first contact surface as at least one upper surface and an inclined surface; and providing a key plate between a first plate and a second plate of a work machine, wherein the first plate is part of the cablizer of the work machine, and the second plate is part of the body of the work machine, and the first plate is mounted vertically on the second plate. The key plate may be positioned in a space created by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate in cross-sectional views of the first and second plates, wherein the second recess is aligned vertically with the first recess to fasten the first and second plates together.

[0010] In another embodiment, an interconnection arrangement for a working machine is disclosed or implemented. The interconnection arrangement for a working machine may include a first plate which is part of the working machine and key plate, a first plate which is rotatable vertically around the shaft of the working machine, and a key plate which has at least one first contact surface as at least one top surface and an inclined surface in a cross-sectional view of the key plate. The first plate and the key plate may be adapted to match another plate.

[0011] Other features and aspects of this disclosure will become apparent from the following description and accompanying drawings. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a perspective view of a forestry work machine as an example of a work machine, according to one or more embodiments of the disclosed subject matter. [Figure 2] Figure 2 is a side view of the work machine shown in Figure 1. [Figure 3] Figure 3 is a perspective view of the cab and cab riser of the work machine shown in Figure 1, in the operating position. [Figure 4]Figure 4 is a perspective view of the cab and cab riser of the work machine shown in Figure 1, in the transport position. [Figure 5] Figure 5 is an inside perspective view of the cab bulge in the operating position shown in Figure 3. [Figure 6] Figure 6 is a perspective view of a clamping assembly of a work machine according to an embodiment of the disclosed subject. [Figure 7] Figure 7 is a schematic diagram showing how the first plate and the second plate are coupled with a key plate between the first plate and the second plate according to an embodiment of the disclosed subject matter. [Figure 8] Figure 8 shows a schematic cross-sectional view of an embodiment of the disclosed subject, in which the first plate is positioned relative to the second plate by a key plate between them. [Figure 9] Figure 9 shows a schematic cross-sectional view of the first plate, which is provided adjacent to the second plate and has the key plate shown in Figure 7, between the first and second plates. [Figure 10A] Figures 10A, 10B, 10C, 10D, and 10E show schematic cross-sectional views of various key plates used to fasten the first and second plates according to embodiments of the disclosed subject matter. [Figure 10B] Same as above. [Figure 10C] Same as above. [Figure 10D] Same as above. [Figure 10E] Same as above. [Figure 11A] Figures 11A, 11B, and 11C show perspective views of various key plates according to embodiments of the disclosed subject matter. [Figure 11B] Same as above. [Figure 11C] Same as above. [Figure 12] Figure 12 is a perspective view of another forestry work machine as an example of a work machine according to one or more embodiments of the disclosed subject matter. [Modes for carrying out the invention]

[0013] This disclosure relates to a work machine, and more particularly to a work machine such as a forestry work machine having a cab and a cab riser tiltably coupled to a main body, as well as systems, assemblies, and methods thereof. Generally, embodiments of the disclosed subject matter can implement a keeper plate for securely fixing a cab riser to a main body of a work machine, the keeper plate being attachable between a first plate that can be part of the cab riser and a second plate that can be part of the main body. Optionally, the keeper plate can be part of the first plate or part of the second plate (i.e., integrally formed with the first plate or the second plate).

[0014] Referring to the drawings, FIG. 1 shows a perspective view of a forestry work machine as an example of a work machine 1 according to one or more embodiments of the disclosed subject matter, although embodiments of the disclosed subject matter are not so limited. FIG. 2 shows a side view of the work machine 1 shown in FIG. 1.

[0015] Referring to FIGS. 1 and 2, the work machine 1 can have a main body 13 and a lower traveling body 11. In the work machine 1, the main body 13 can be rotatably provided on the lower traveling body 11 as an upper swing body via a swing bearing portion 12. The cab 14 may be mounted on a cab riser 15 that serves as a base for attaching the cab 14 to one side of the front portion of the main body 13. The cab 14 may be integrally formed on the cab riser 15, i.e., the cab 14 may be part of the cab riser 15. A driver's seat, an operation lever, etc. can be installed in the cab 14. The cab 14 and the cab riser 15 can be integrally formed with and tiltably coupled to the main body 13 (e.g., the machine main body). In other examples, the cab 14 and the cab riser 15 may be separately manufactured and / or detachably coupled. Alternatively, the cab 14 and the cab riser 15 may be regarded as two sections of one element, such as prehub elements and / or non-detachable elements.

[0016] In FIGS. 1-2, a door to the cab 14 can be provided on the rear side surface of the cab 14 so that a driver can access the inside of the cab 14 and board the vehicle. Further, the cab 14 may include one or more viewports 31 (e.g., windows, openings, etc.) that enable the driver located inside the cab 14 to see the outside.Furthermore, the working boom can be attached to the other side surface of the front portion of the main body 13. A power unit such as an engine and a hydraulic pump driven by the engine can be attached to the rear portion of the main body 13.​​​​​​Referring here to Figures 3 and 4, Figure 3 is a perspective view of the cab 14 and cab riser 15 of the work machine 1 of Figures 1 and 2 in the operating position, and Figure 4 is a perspective view of the cab 14 and cab riser 15 of the work machine 1 of Figures 1 and 2 in the transport position. The operating position and the transport position may be referred to herein as the first position and the second position, respectively. The cab 14 and cab riser 15 may be tiltably coupled to the work machine 1 so that the cab 14 and cab riser 15 can tilt around a shaft 33 from the illustrated upright position (i.e., the operating position) shown in Figure 3 to the tilted position (i.e., the transport position) shown in Figure 4. The shaft 33 may be located on the front end of the body 13 and rotatably connects the cab riser 15 to the body 13. The cab riser 15 can rotate clockwise and counterclockwise around the shaft 33 between the operating position and the transport position. An inclined actuator (e.g., a cylinder, ball screw, any electric or hydraulic actuator) may be provided on the body 13 with which the bottom of the cab lifter 15 makes contact. The base of the actuator may be positioned on the body 13, and the end of the actuator may be positioned toward the rear of the cab lifter 15. When the actuator extends, the cab lifter 15 may be tilted forward around the shaft 33 as shown in Figure 4, and when the actuator retracts, the cab lifter 15 may be tilted to an upright position as shown in Figure 3. A switch 36 for controlling the actuator to tilt the cab lifter 15 may be provided, for example, on the side of a component that may be mounted on the body 13 as part of the body 13.

[0019] Referring to Figure 4, the cavity 41 may be located on the rear side of the cab riser 15. The cavity 41 may be adapted to be coupled with the clamping assembly 42 of the work machine 1. Furthermore, the cavity 41 may be adapted to house a frame used to secure the cab 14 and cab riser 15 to the body 13 of the work machine 1.

[0020] According to one or more embodiments of the disclosed subject matter, a clamping assembly 42 may be provided on the body 13 of the work machine 1. The clamping assembly 42 includes a base structure, a clamping structure, and an actuator, which can move the clamping structure linearly in the forward travel direction of the work machine 1. Such movement may follow a first linear direction for clamping (e.g., opposite the forward travel direction) and a second direction opposite the first direction (e.g., the forward travel direction) for unclamping.

[0021] As shown in Figures 3-4, the cab bulger 15 may include an access door 34 located on the side 32 of the cab bulger 15. According to the embodiment, the operator of the work machine 1, who does not need to be the same person as the person accessing the cab 14, can open the access door 34 and access the switches inside the housing of the cab bulger 15 through the access door 34. A switch 35 for activating the clamping assembly 42 may be located adjacent to the clamping assembly 42, which the operator can operate through the access door 34. The detailed mechanism of the clamping assembly 42 is described below.

[0022] Referring now to Figure 5, which shows an internal perspective view of the cab brizer 15 in the operating position shown in Figure 3. In Figure 5, one side of the housing of the cab brizer 15 is removed for internal explanation.

[0023] According to one or more embodiments, the cab lifter 15 may include support members 51a to 51c, each of which may be a columnar member extending perpendicularly to the operating position as a frame 50 supporting the cab 14. Support member 51d may be connected to support member 51a at one end as part of the frame and extend horizontally along the forward travel direction in the operating position. Similarly, another lateral support member may be connected to another columnar support member at one end as part of the frame and extend horizontally along the forward travel direction parallel to support member 51d in the operating position.

[0024] The plate 52, which may be flat, may be positioned to bridge the gap between the support member 51d and another lateral support member mounted parallel to the support member 51d, in a direction perpendicular to the direction of travel. At one edge of the plate 52, the lower surface of the plate 52 may contact the upper surface of the support member 51d, and the lower surface of the plate 52 may be fixed to the support member 51d. The other edge of the plate 52 may contact the upper surface of another lateral support member, and the other edge of the plate 52 may be fixed to the other lateral support member. The plate 52 may be referred to herein as the first plate.

[0025] In one embodiment, the support member 51c may be attached to the upper surface of the plate 52, and the bottom surface of the support member 51c may be in contact with the upper surface of the plate 52 at one end. Similarly, other columnar support members may be attached to the upper surface of the plate 52, and the bottom surface of the other columnar support members may be in contact with the upper surface of the plate 52 at one end. The plate 52 and the support members 51c or other columnar support members may be fastened together by fastening members (e.g., bolts with nuts and washers, screws, etc.).

[0026] It should be noted that the embodiments of the disclosed subject matter are not limited to the specific arrangement of plate 52 shown in Figure 5. For example, the embodiments of the disclosed subject matter may position plate 52 in different locations as part of the frame of cab rib 15 of the work machine 1.

[0027] As shown in Figure 5, clamps 53a and 53b, each of which may be C-shaped, may be positioned adjacent to the plate 52. Clamps 53a and 53b may be positioned on opposite edges of the plate 52 in the longitudinal direction. Details of clamps 53a and 53b are described with reference to Figure 6. Although Figure 5 shows two clamps, embodiments of the subject matter disclosed may include only one clamp, for example, and are not limited thereto.

[0028] As shown in Figure 5, the base member 54 is mounted on a support member 51d adjacent to the plate 52 and may be fixed to the support member 51d at one end by a fastening member (e.g., a bolt with nuts and washers, screws, etc.). At the other end of the base member 54, a cylindrical member 55 can be connected to the base member 54 so that the cylindrical member 55 can extend along the forward travel direction of the work machine 1. The inside of the cylindrical member 55 may be hollow to receive a locking member, for example, a slide bolt having a handle 56 extending upward from the body of the locking member. More specifically, the locking member can pass through a through hole (e.g., a slot or slit) that may be located on the fastening assembly 42 by manually sliding the handle 56 in the direction opposite to the forward travel direction of the work machine 1. In the embodiment, the cylindrical member 55 and the locking member can be used to lock or otherwise hold the cab lifter 15 to the body 13 of the work machine 1 when the cab lifter 15 is in the first position, in addition to the clamping structure (e.g., clamps 53a and 53b). Such additional locking or holding of the cab lifter 15 to the body 13 of the work machine 1 can further reduce the possibility of the cab lifter 15 separating, which can improve safety.

[0029] As shown in Figure 5, a switch 57 for activating electric actuators that can be coupled to clamps 53a and 53b may be positioned as part of the frame of the cab riser 15 adjacent to the access door 34, as shown in Figure 3, so that, for example, the driver can operate the switch 57 through the access door 34.

[0030] Referring now to Figure 6, Figure 6 shows a perspective view of a clamping assembly 42 of a working machine according to an embodiment of the disclosed subject.

[0031] As shown in Figure 6, the fastening assembly 42 may include base members 62a and 62b, a support member 63, a plate 64 which may be flat, clamps 53a and 53b, a base member 66, an electric actuator 67, and a connecting member 68. In the embodiment, base members 62a and 66 may be attached to the main body 13 by fastening members (e.g., bolts having nuts and washers, screws, etc.).

[0032] According to one or more embodiments, a support member 63 may be mounted vertically on a base member 62a to support a plate 64 and a connecting member 68. The plate 64 may be connected at one end to the support member 63 and at the other end to another support member mounted on the base member 62b. As shown in Figure 6, the plate 64 may have a recess on one of its lateral edges to receive clamps 53a and 53b. The plate 64 may be referred to herein as the second plate.

[0033] Again, each of the clamps 53a and 53b, which may have a C-shape in the side elevation view, may have bottom contact surfaces 65a and 65b, respectively. The bottom contact surface 65a may be angled to contact the upper surface of the plate 52 (i.e., the first plate) of the cab riser 15. Similarly, the bottom contact surface 65b may be angled to contact the upper surface of the plate 52 (i.e., the first plate) of the cab riser 15.

[0034] In the embodiment, clamps 53a and 53b may be connected to an electric actuator 67, which can provide the clamps 53a and 53b with movement in the forward and reverse directions of the work machine 1. For example, when the cab lifter 15 is in a first or operating position, the electric actuator 67 can move clamps 53a and 53b to the opposite side of the forward direction of travel to engage with the upper surface of the plate 52 of the cab lifter 15. On the other hand, the electric actuator 67 can move clamps 53a and 53b in the opposite direction, i.e., in the forward direction of travel, to engage and disengage, for example, the upper surface of the plate 52 of the cab lifter 15, thereby allowing the cab lifter 15 to be driven to move to a second or transport position.

[0035] As shown in Figure 6, the electric actuator 67 can be connected to the base member 66 at the other end. Furthermore, while engaged with the clamps 53a and 53b, the electric actuator 67 can provide a predetermined force that pushes the clamps 53a and 53b in the opposite direction to the forward travel direction.

[0036] It should be noted that the embodiments of the subject matter disclosed are not limited to the electric actuator 67 shown in Figures 5 and 6. For example, the embodiments of the subject matter disclosed may employ a hydraulic actuator instead of an electric actuator to move the clamps 53a and 53b.

[0037] Furthermore, it should be noted that the embodiments of the subject matter of this disclosure are not limited to the same number of clamps 53a and 53b as shown in Figure 6. For example, the embodiments of the subject matter disclosed may employ one or more clamps to fasten plates 52 and 64 together. Optionally or alternatively, one or more clamps may be positioned at any point around plates 52 and 64 in the plan view.

[0038] In Figure 6, the connecting member 68 can be mounted on the support member 63 and the plate 64. As described above, the connecting member 68 may have a through hole 69 in its center to receive, for example, a locking member from the cab riser 15. The diameter of the through hole 69 may match the diameter of the cylindrical member 55.

[0039] Referring now to Figure 7, Figure 7 shows a schematic diagram of a first plate (i.e., plate 52) and a second plate (i.e., plate 64) being coupled with a key plate 71 between the first plate and the second plate, according to an embodiment of the disclosed subject.

[0040] As shown in Figures 6-7, the support members 72a and 72b, as well as the vertical plate 73 which may be positioned parallel to the plate 64, may be part of the fastening assembly 42. The plate 73 may be longitudinally connected to the support member 63 at one end, and the support members 72a and 72b may be attached to the upper surface of the plate 73.

[0041] According to one or more embodiments, the key plate 71 may be detachably or removablely positioned between the plate 52 and the plate 64. More specifically, the lower surface of the plate 52 may have a first recess 74, and the upper surface of the plate 64 may have a second recess 75 for accommodating the key plate 71.

[0042] The key plate 71 may be formed to substantially match the shape of the space created by the first recess 74 and the second recess 75 when the clamps 53a and 53b are engaged. Optionally, the key plate 71 may have a width different from (e.g., smaller than) the width of the first recess 74 and / or the second recess 75 (i.e., within the page of Figure 7). In one or more embodiments, the material of the key plate 71 may be metal, which can be formed, for example, by machining rather than casting, which can improve material yield.

[0043] Optionally, as shown in Figure 7, the key plate 71 may be attached to the plate 52 with fastening members such as bolts 76, nuts 77, and washers 78. The fastening members can be provided by any fastening means (e.g., bolts, nuts, washers, screws, clamps, etc.) and are not limited to the examples in this disclosure. Variations of the arrangement of the key plate 71 and fastening members are shown in Figures 10A to 10E.

[0044] As a result, by positioning the key plate 71 between the plate 52 and the plate 64, the two plates can make firm contact without undesirable lateral movement (e.g., rattling) of the work machine 1. The arrangement of the key plate 71 and variations in the shape of the key plate 71 are shown in Figures 10A-10E and 11A-11C.

[0045] Referring now to Figure 8, Figure 8 shows a schematic cross-sectional view of an embodiment of the subject disclosed, in which the key plate 71 positions the first plate 52 relative to the second plate 64 located between them.

[0046] As shown in Figure 8, the first recess 74 may be formed by three surfaces (at least in the cross-sectional view), a bottom surface 81, a first inclined surface 82a, and a second inclined surface 82b, and as a result, the first recess 74 may be trapezoidal in shape, for example, in the cross-sectional view. Similarly, the second recess 75 may be formed by three surfaces (at least in the cross-sectional view), a bottom surface 83, a first inclined surface 84a, and a second inclined surface 84b, and as a result, the second recess 75 may be trapezoidal in shape, for example, in the cross-sectional view.

[0047] The key plate 71 can be inserted into the space created by the first recess 74 and the second recess 75 when the plates 52 and 64 are positioned adjacent to each other (for example, for tightening by a clamping structure such as clamps 53a and 53b in the engaged state). The key plate 71 can be formed to substantially match the shape of the space created by the first recess 74 and the second recess 75 when the clamps 53a and 53b are engaged, i.e., when the cab 14 is positioned in the operating position.

[0048] The upper half of the key plate 71 may consist of three surfaces, for example, in the cross-sectional view of Figure 8: an upper surface 85, an inclined surface 86a, and an inclined surface 86b. The upper surface 85 of the key plate 71 may be a plane substantially parallel to the bottom surface 81 of the first recess 74 located on the plate 52. The inclined surfaces 86a and 86b may be inclined horizontally in different directions so that they can fit into the inclined surfaces 82a and 82b, respectively. When the cab 14 is positioned in the operating position and the plate 52 is placed on the plate 64 by gravity, a small gap (e.g., 0.5 mm to 1.0 mm) may exist between the upper surface 85 of the key plate 71 and the bottom surface 81 of the first recess 74 located on the plate 52. In other words, as plate 52 approaches plate 64 by its own weight when cab 14 is positioned in the driving position, the inclined surfaces 82a and 82b of the first recess can contact the inclined surfaces 86a and 86b of key plate 71, respectively, and key plate 71 can be positioned along the inclined surfaces. At that time, the bottom surface 81 of the first recess 74 can approach the top surface 85 of key plate 71 substantially parallel to it, but they do not have to be in full contact with each other. Instead, a thin gap may exist between the top surface 85 of key plate 71 and the bottom surface 81 of the first recess 74 so that the inclined surfaces can make contact first.

[0049] The lower half of the key plate 71 may consist of three surfaces, for example, an upper surface 87, an inclined surface 88a, and an inclined surface 88b, as shown in the cross-sectional view of Figure 8. The upper surface 87 of the key plate 71 may be a plane substantially parallel to the bottom surface 83 of the second recess 75 located on the plate 64. The inclined surfaces 88a and 88b may be inclined horizontally in different directions so that they can fit into the inclined surfaces 84a and 84b, respectively. When the cab 14 is positioned in the operating position and the plate 52 is placed on the plate 64 by gravity, a small gap (e.g., 0.5 mm to 1.0 mm) may exist between the upper surface 87 of the key plate 71 located on the plate 64 and the bottom surface 83 of the second recess 75. In other words, as plate 52 approaches plate 64 by its own weight when cab 14 is positioned in the operating position, the inclined surfaces 84a and 84b of the second recess can contact the inclined surfaces 88a and 88b of key plate 71, respectively, and key plate 71 can be positioned along the inclined surfaces. At that time, the upper surface 87 of key plate 71 can approach the bottom surface 83 of the second recess 75 substantially parallel to each other, but they do not have to be in complete contact. Instead, a thin gap may exist between the upper surface 87 of key plate 71 and the bottom surface 83 of the second recess 74 so that the inclined surfaces can make contact first.

[0050] When the transition of the work machine 1 from the transport position to the operating position begins, the key plate 71 can be attached to the bottom surface 83 of the second recess 75 of the plate 64 so that the center position of the key plate 71 aligns with the center position of the second recess 75 in the top view. The movement of attaching the key plate 71 can be smoothly guided by the inclined surfaces 84a and 84b of the second recess 75, and the inclined surfaces 88a and 88b of the key plate 71. Next, the plate 52 can approach the top surface 85 of the key plate 71 in an arc around the shaft 33, in conjunction with the inclined movement of the cab riser 15 toward the body of the work machine 1 in the cross-sectional view. After the plate 52 is close enough to the plate 64, the first recess 74 of the plate 52 can be smoothly guided to the top surface 85 of the key plate 71 in the correct position along the inclined surfaces 82a and 82b of the first recess 74, and the inclined surfaces 86a and 86b of the key plate 71.

[0051] Optionally, the thickness of the key plate 71 may be adjusted to be slightly thinner than the height of the space created by the first recess 74 and the second recess 75. As described above, by bringing the inclined surface of the key plate 71, as well as the inclined surfaces of plates 52 and 64, into contact, a thin gap (e.g., 0.5 mm to 1.0 mm) may be present in the cross-sectional view between the lower surface of plate 52 and the upper surface of plate 64 before the two plates are clamped together by clamps 53a and 53b in a fitted state where plate 52 rests on plate 64 by gravity. Subsequently, by clamping plates 52 and 64 together with clamping structures such as clamps 53a and 53b, the key plate 71 can engage firmly with the space formed by the first recess 74 and the second recess 75, thereby more securely fixing the two plates together. By optionally or alternatively fastening plates 52 and 64 with a fastening structure, at least one of plates 52 and 64 can be slightly deformed by elastic deformation, and the upper surfaces 85 and 87 can come into direct contact with the bottom surface 81 of the first recess 74 and the bottom surface 83 of the second recess 75. Such fastening can eliminate some or all of the thin gap.

[0052] As shown in Figure 8, by providing a first recess 74 and a second recess 75 on the contact surfaces of plate 52 and plate 64, and by inserting a key plate having a shape that can fit into the space created by the first recess 74 and the second recess 75, for example as shown in the cross-sectional view of Figure 8, the inclined surfaces of the first recess 74 and the second recess 75 and the inclined surface of the key plate 71 can serve as guides for positioning the two plates 52 and 64 in the appropriate position in the top view. Furthermore, the key plate 71 can adjust the displacement of plates 52 and 64 at least in the lateral direction (including the left-right direction in Figure 8) before and during the engaged state using clamps 53a and 53b. Specifically, when the first plate 52 and the second plate 64 are tightened using clamps 53a and 53b, the first plate 52 may need to rest on the key plate 71 if the first plate 52 and the second plate 64 are displaced laterally. In that case, it may be necessary to widen the gap between the first plate 52 and the second plate 64. However, in that case, a clamping force with vertical clamps 53a and 53b is applied, making it more difficult for the structure to slide laterally.

[0053] Referring here to Figure 9, Figure 9 shows a schematic cross-sectional view of the first plate 52 provided adjacent to the second plate 64 having the key plate 71 of Figure 7 between the first plate and the second plate. The plate 52 may be fastened to the second plate 64 in the position shown in Figure 9, for example, using clamps 53a and 53b. Optionally or alternatively, according to embodiments of the disclosed subject matter, the key plate 71 can be attached to the first recess 74 of the plate 52 using fastening members (e.g., bolts 76, nuts 77, and washers 78).

[0054] Here, as an example shown in Figure 9, the key plate 71 may have a through hole 91 formed in the center or near the center in the top view of the key plate 71. Similarly, the plate 52 may have a through hole 92 that can be aligned with the through hole 91 in the top view of the plate 52. The through holes 91 and 92 may have the same or near the same diameter.

[0055] Similarly, the plate 64 may be formed with through holes 93 that can be aligned with through holes 91 in a plan view. According to one or more embodiments, the diameter 94 of the through hole 93 may be larger than the diameters of the through holes 91 and 92 to accommodate fastening members in the form of bolts 76, for example, as shown in Figure 9. Here, in Figure 9, the key plate 71 can approach the bottom surfaces 95a and 95b of the plate 64, which have a thin gap in a cross-sectional view and can surround the through hole 93 in a plan view. As an example, the head of the fastening member in the form of a bolt 76 may be formed in the shape of a frustoconical whose outer diameter gradually decreases downward in a cross-sectional view, such as shown in Figure 9.

[0056] According to one or more embodiments, angle 98 is the angle between the vertical line 96 and the diagonal line 97, which may correspond to at least one of the angles of the inclined surface 84a relative to the vertical line 96 or the angle of the inclination 88a relative to the vertical line 96 in a cross-sectional view. Similarly, the inclined surface 84a or inclination 88a relative to the vertical line 96 may be formed by an angle substantially the same as angle 98. In one embodiment, for example, angle 98 may be 30 degrees, but is not limited thereto.

[0057] Therefore, the inclined surfaces 84a and 84b of the second recess 75 of plate 64, and the inclined surfaces 88a and 88b of the lower half of key plate 71 can serve as guides to align the two plates 52 and 64 in the correct position in the plan view when the cabliizer 15 is tilted upright on the main body 13.

[0058] Furthermore, in the examples shown in Figures 7 and 9, the key plate 71 can be fastened to plate 52 (i.e., the first plate) by fastening members such as bolts 76, nuts 77, and washers 78 to enhance or improve retention. When the key plate 71 is fastened to plate 52 by fastening members, it can be mounted as part of the cab rizer 15 in both the transport and operating positions. Furthermore, the key plate 71 may be fastened to plate 64 (i.e., the second plate) by fastening members and mounted as part of the main body 13 in both the transport and operating positions. Furthermore, the key plate 71 may be integrally formed with either plate 52 or plate 64. As a result, it is not necessary to manually attach and detach the key plate 71 each time the cab rizer 15 moves between the transport and operating positions, improving the usability of the work machine 1.

[0059] Referring now to Figures 10A, 10B, 10C, 10D, and 10E, these figures show schematic cross-sectional views of a first plate and a second plate having key plates arranged in various ways relative to each other, according to embodiments of the disclosed subject matter.

[0060] As shown in Figure 10A, plates 52 and 64 are connected by a key plate 71 and may be secured by fastening members including a fastener body 100 (e.g., a bolt, screw, etc.) and fastening heads 101a and 101b, which can be positioned approximately in the center of the key plate 71 in a plan view. The fastener body 100 can be secured at both ends to plates 52 and 64 by fastener heads 101a and 101b, respectively. Here, the diameter of the fastener body 100 may be smaller than the diameter of the opening in the thickness direction passing through each of plates 52, 64, and 71. Here, the fastener heads 101a and / or 101b may comprise a bolt, nut, and washer.

[0061] As shown in Figure 10B, plates 52 and 64 may be connected by a key plate 71 and fastening members including fastener bodies 103, fastener bodies 105, and fastener heads 102a-102b and 104a-104b. Fastener bodies 103 and 105 may be arranged symmetrically on both sides of the key plate 71 in a cross-sectional view. Each fastener body 103 can be fixed to plates 52 and 64 at both ends by fastener heads 102a and 102b, respectively. Similarly, each fastener body 105 can be fixed to plates 52 and 64 at both ends by fastener heads 104a and 104b, respectively. Here, the diameters of fastener bodies 103 and 105 may be smaller than the diameter of the opening in the thickness direction passing through each of plates 52 and 64. Therefore, in the embodiments of the subject disclosed, the key plate 71 may not have an opening in the thickness direction.

[0062] As shown in Figure 10C, plates 52 and 64 may be connected by a key plate 71 and fastened by clamps 106a and 106b, which can be arranged symmetrically in the longitudinal direction at both edges of plates 52 and 64 in a cross-sectional view. Clamps 106a and 106b may be provided as clamps 53a and 53b in the same manner as shown in Figure 6. Thus, in the embodiments of the disclosed subject, plates 52, 64, or the key plate 71 may not have openings in the thickness direction.

[0063] Figure 10D shows another example of fastening plates 52 and 64 by a key plate 71, fastener body 100, fastener body 103, and fastener body 105. Fastener body 100 may be positioned approximately in the center of the key plate 71 in a plan view, and fastener body 103 and fastener body 105 may be positioned symmetrically on both sides of the key plate 71 in a cross-sectional view. In this embodiment, the key plate 71 can be fastened to plate 52 by a fastener head 101a on the upper surface of plate 52 and by a fastener head 101b on the lower surface of key plate 71. Here, the diameters of the fastener bodies 100, 103, and 105 may be smaller than the diameters of the openings in the thickness direction that pass through plate 52, plate 64, and key plate 71, respectively. In this example, the diameter of the opening in the thickness direction of plate 64 may be larger than the diameter of the opening in the thickness direction of plate 52.

[0064] Figure 10E shows another example of fastening plates 52 and 64 by a key plate 107 and by fastening members including fastener bodies 100, 103, and 105. In this embodiment, fastener body 100 may be positioned approximately in the center of the key plate 107 in a plan view, and fastener bodies 103 and 105 may be positioned symmetrically on either side of the key plate 107 in a cross-sectional view. Furthermore, in this embodiment, the key plate 107 may be fastened to plate 52 by fastener heads 101a on the upper surface of plate 52 and by fastener heads 101b on the lower surface of key plate 107. Here, the diameters of fastener bodies 100, 103, and 105 may be smaller than the diameters of the openings in the thickness direction passing through plate 52, plate 64, and key plate 107, respectively. In this example, the diameter of the opening in the thickness direction of plate 64 may be larger than the diameter of the opening in the thickness direction of plate 52.

[0065] As shown in Figure 10E, the first recess 74 may be substantially rectangular in shape in cross-section, as it may not be necessary to position the key plate 107 on the plate 52. In this embodiment, the upper half of the key plate 107 may consist of three surfaces: a top surface 108, a side surface 109a, and a side surface 109b, while the lower half of the key plate 107 may be formed in the same shape as the key plate shown in Figure 8 in cross-section. The top surface 108 may be flat in the horizontal direction, and the side surfaces 109a and 109b may be flat in the vertical direction, that is, the upper half of the key plate 107 can be fitted into the rectangular shape of the first recess 74. In this embodiment, the manufacturing process for the key plate 107 may be relatively simpler than the manufacturing process for the key plate 71, thus reducing process time and cost.

[0066] Therefore, even when bolts are used as fastening members to fix two plates vertically, the key plate 71 or key plate 107, which can adjust for lateral displacement, can reduce the shear force applied to the bolts laterally, thereby avoiding damage to the bolts due to shear force.

[0067] The plates 52 and 64 can be fastened together by combining fastening members (for example, fastener bodies 100, 103, and 105) and the clamping structures shown in Figures 10A to 10E (for example, clamps 106a and 106b).

[0068] Here, Figures 11A–11C, 11A, 11B, and 11C show perspective views of various key plates according to embodiments of the disclosed subject matter.

[0069] As shown in Figure 11A, the key plate 71 may be formed by upper surfaces 111a-111b, inclined surfaces 112a-112d, and inclined surfaces 113a-113d. The upper half of the key plate 71 may consist of the upper surface 111a and four inclined surfaces 112a-112d that can be inclined in different directions, and may be formed in a substantially square pyramidal shape with the upper surface 111a which may be flat. Similarly, the lower half of the key plate 71 may consist of the upper surface 111b and four inclined surfaces 113a-113d that can be inclined in different directions, and may be formed in a substantially square pyramidal shape with the upper surface 111b which may be flat. The lower half of the key plate 71 may be an inverted shape of the upper half of the key plate 71. According to one or more embodiments, each of the inclined surfaces 112a-112d and 113a-113d may be trapezoidal in cross-sectional view, and each of the upper surfaces 111a and 111b may be square in plan view.

[0070] As shown in Figure 11B, the key plate 71 may be formed by upper surfaces 114a-114b and inclined surfaces 115 and 116. The upper half of the key plate 71 may be formed by a substantially conical shape consisting of an upper surface 114a and an inclined surface 115 that can be inclined, and having an upper surface 114a that may be flat. Similarly, the lower half of the key plate 71 may be formed by a substantially conical shape consisting of an upper surface 114b and an inclined surface 116 that can be inclined, and having an upper surface 114b that may be flat. The lower half of the key plate 71 may be an inverted shape of the upper half of the key plate 71. According to one or more embodiments, each of the inclined surfaces 115 and 116 may be trapezoidal in a cross-sectional view, and each of the upper surfaces 114a and 114b may be circular in a plan view.

[0071] As shown in Figure 11C, the key plate 71 may be formed by upper surfaces 117a to 117b, side surfaces 118a to 118b, and inclined surfaces 119a to 119d. According to one or more embodiments, each of the side surfaces 118a and 118b may be shown in a cross-sectional view as a combined trapezoidal shape formed by two trapezoidal shapes placed back to back, while each of the inclined surfaces 119a to 119d may be rectangular in a cross-sectional view. Each of the upper surfaces 117a and 117b may be rectangular in a plan view. Opposing side surfaces 118 and 118b may each be oriented vertically.

[0072] Therefore, the inclined surface of the key plate 71 shown in Figures 11A to 11C can serve as a guide to align the two plates 52 and 64 in the appropriate position in the plan view when the cab lifter 15 is tilted upright on the main body 13. Furthermore, the key plate 71 can reduce the lateral displacement of the two plates 52 and 64.

[0073] As described above, the key plate 71 can be formed in a variety of shapes. It should be noted that the embodiments of the subject matter of this disclosure are not limited to the specific shapes of the key plate shown in Figures 11A-11C (or elsewhere in this specification).

[0074] Referring now to Figure 12, which is a perspective view of another forestry work machine as an example of work machine 2 according to one or more embodiments of the disclosed subject matter. In Figure 12, the height of the cab riser 122 and the position of the door 123 are different from those shown in Figure 1. The operator of work machine 2 can enter the cab 121 through the door 123 which is provided on the side of the cab 121. The positioning of the cab riser 122 relative to the body, clamping assembly, and / or locking assembly discussed herein can be equally applied to work machine 2.

[0075] It should be noted that the embodiments of the subject matter of this disclosure are not limited to the specific arrangement of the cab lifter and the position of the door shown in Figure 12. For example, the embodiments of the subject matter disclosed may have the cab lifter and / or parts thereof positioned at different locations on the work machine 2. [Industrial applicability]

[0076] As stated above, this disclosure relates to working machinery, and more particularly to forestry working machinery having a cab and a cab riser tiltably coupled to the body, as well as systems, assemblies and methods thereof.

[0077] Embodiments of the subject matter of this disclosure may include a work machine that may comprise a body and a cab lifter. The cab lifter may include a cab and a frame, the cab being positioned upright on the work machine in a first position and tilted forward in a second position, and the frame comprising a first plate that contacts a second plate provided on the body in the first position. The first plate and the second plate may be joined together to sandwich a key plate when the cab is in the first position, the key plate being positioned in the space created by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate in a cross-sectional view of the first plate and the second plate, the second recess being aligned perpendicular to the first recess when the cab is in the first position, and in a cross-sectional view of the key plate, the key plate may include at least one first contact surface and at least one upper surface as inclined surfaces, the upper surface being adjacent to the inclined surfaces and substantially parallel to the first plate or the second plate perpendicularly.

[0078] Alternatively, embodiments of the disclosed subject matter may include methods. The methods may include providing a key plate for a working machine, wherein the key plate has at least one first contact surface as at least one upper surface and an inclined surface in a cross-sectional view of the key plate, and providing a key plate between a first plate and a second plate of a working machine, wherein the first plate is part of the cablizer of the working machine, and the second plate is part of the body of the working machine, and the first plate is mounted perpendicularly on the second plate. The key plate may be positioned in a space created by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate in cross-sectional views of the first and second plates, wherein the second recess is aligned perpendicularly with the first recess to fasten the first and second plates together.

[0079] Alternatively, embodiments of the disclosed subject matter may include interconnection arrangements for work machines. The interconnection arrangement for a work machine may include a first plate which is part of the work machine and key plate, a first plate which is rotatable vertically around the shaft of the work machine, and a key plate which has at least one first contact surface as at least one top surface and at least one inclined surface in a cross-sectional view of the key plate. The first plate and the key plate may be adapted to match another plate.

[0080] At least one of the first recess and the second recess is trapezoidal in shape in a cross-sectional view of the first or second plate, and the key plate may match the shape of the space created by the first and second recesses when the cab is in the first position, and is provided in the first and second recesses when the cab is in the first position.

[0081] For example, the second recess includes a second contact surface as a bottom surface and an inclined surface in the cross-sectional view of the second plate. Specifically, the first contact surface of the key plate can contact the second contact surface of the second recess when the cab is in the first position in the cross-sectional view of the second plate. Thus, the center point of the key plate can be aligned with the center of the second recess by the guide formed by the first and second contact surfaces.

[0082] In the cross-sectional views of the first and second plates, recesses are placed on the contact surfaces of the two plates, and a key plate having a fitable shape is positioned within the space created by the recesses. In this way, the inclined surfaces of the recesses and the key plate can serve as guides for positioning the two plates in the correct locations in the plan views of the first and second plates.

[0083] Optionally, the working machine may include a shaft rotatably connecting a cab lifter to the main body, the cab lifter being rotatable clockwise and counterclockwise around the shaft between a first position and a second position. A key plate may be fixed to a first recess of the first plate by a fastening member, and the key plate may be movable with the first plate while the cab lifter is tilted from the second position to the first position. In this case, the first recess may have a rectangular shape in cross-sectional view, and the first recess includes a bottom surface and a third contact surface as sides, the third contact surface being perpendicular to the bottom surface in cross-sectional view. Thus, another first contact surface of the key plate may contact the third contact surface of the first recess in cross-sectional view of the first plate when the cab is in the first position. That is, the bottom surface of the first plate and the top surface of the second plate may be directly or indirectly adjacent to each other while the first plate and the second plate are fixed by the key plate.

[0084] As a result, the manual attachment and removal of the key plate is no longer required each time the cab rizer moves between the transport and operating positions, improving the utility of the work machine.

[0085] Optionally or alternatively, the first hole may be located at the center of the key plate in the plan view of the working machine, the second hole may be located on the first plate and aligned with the first hole in the plan view, and the third hole may be located on the second plate and aligned with the first and second holes in the plan view. Fastening members can be inserted into the first, second, and third holes to fix the first plate, key plate, and second plate together in the first position.

[0086] The holes and fastening members (e.g., bolts, nuts, washers, screws, clamps, etc.) for securing the two plates together may be located in different positions in the plan view of the work machine. By securing the two plates with fastening members and placing a key plate between them, the two plates can be in firm contact without undesirable lateral movement (e.g., rattling) of the work machine.

[0087] Optionally, when the cab is in the first position, the two plates (the first plate and the second plate) may be fastened together by a fastening assembly in addition to being joined by a key plate. The fastening assembly may include two C-shaped clamps that, when the cab is in the first position, fasten the first plate and the second plate together at their opposite edges in the longitudinal direction of the first plate and the second plate.

[0088] Optionally or alternatively, the upper surface of the key plate may have a square shape in the plan view of the key plate, and the lower half of the key plate may consist of the upper surface and four first contact surfaces, each of which is inclined in a different direction to form a square pyramidal shape. The upper half of the key plate may be an inverted shape of the lower half of the key plate.

[0089] Optionally or alternatively, the upper surface of the key plate may have a circular shape in the plan view of the key plate, and the lower half of the key plate may consist of the upper surface and a first contact surface, the first contact surface being inclined to form a cone shape. The upper half of the key plate may be an inverse shape of the lower half of the key plate.

[0090] Optionally or alternatively, the key plate may be formed by machining. Optionally or alternatively, the key plate may be formed integrally as part of the first plate, the first plate being rotatable perpendicular to the second plate.

[0091] According to the embodiment, when the key plate is tilted upright on the cab lifter body, the inclined surface can serve as a guide for aligning the two plates in the correct position in the plan view of the work machine. Furthermore, the key plate can reduce the lateral displacement of the two plates.

[0092] Furthermore, the key plate, which allows for adjustment of lateral displacement, reduces the shear force applied to the bolts in the lateral direction, even when bolts are used as fastening members to fix the two plates vertically, thereby avoiding damage to the bolts due to shear force. Therefore, according to this embodiment, in addition to facilitating the positioning of the cablizer and a part of the body of the work machine by guides during the transfer of the work machine from the transport position to the operating position, it is possible to provide a structure that prevents shear force from being applied to the fastening members, while improving material yield.

[0093] While aspects of this disclosure have been specifically shown and described with reference to the embodiments described above, it will be understood by those skilled in the art that various additional embodiments may be conceived by modifications of the disclosed machines, assemblies, systems, and methods without departing from the spirit and scope of the disclosed content. Such embodiments should be understood to fall within the scope of this disclosure as determined by the claims and any equivalents thereof.

Claims

1. A work machine, The main body and a cab riser including a cab that stands upright on the work machine in a first position and tilts forward in a second position, and a frame having a first plate that contacts a second plate of the body in the first position; a shaft rotatably connecting the carburetor to the first position in a clockwise and counterclockwise direction from the first position to the second position, or from the second position to the first position; the first plate and the second plate are coupled at the first position so as to sandwich a key plate therebetween, the key plate being disposed in a space formed in a cross-sectional view by a first recess on a lower surface of the first plate and a second recess on an upper surface of the second plate, the second recess being aligned with the first recess in a top view; A work machine, wherein the key plate has, in a cross-sectional view, at least one first contact surface that is an upper surface and at least one second contact surface that is an inclined surface.

2. At least one of the first recess and the second recess has a trapezoidal shape in cross section, 2. The work machine according to claim 1, wherein the key plate fits into the space formed by the first recess and the second recess when the cab is in the first position, and is provided in the space formed by the first recess and the second recess when the cab is in the first position.

3. The second recess has a cross section, a bottom surface, a third contact surface, and an inclined surface, a fourth contact surface; 3. The work machine according to claim 2, wherein, in a cross-sectional view, in the first position, the first contact surface of the key plate contacts the third contact surface of the second recess, and the second contact surface of the key plate contacts the fourth contact surface of the second recess.

4. A work machine as described in Claim 3, characterized in that, when viewed from above, the center point of the key plate is aligned with the center of the second recess by being guided by the fourth contact surface.

5. A work machine as described in claim 3, characterized in that the key plate is fixed to the first recess of the first plate by a fixing member, and the key plate is movable in conjunction with the first plate while the carburetor is tilted from the second position to the first position.

6. The first recess is formed in a rectangular shape in a cross-sectional view, and has a fifth contact surface which is a bottom surface, and a sixth contact surface which is a side surface and is perpendicular to the fifth contact surface in a cross-sectional view, 6. The work machine according to claim 5, wherein, in a cross-sectional view, another first contact surface of the key plate contacts the fifth contact surface, and another second contact surface of the key plate contacts the sixth contact surface.

7. a first hole disposed at the center of the key plate in a top view; a second hole is disposed in the first plate, the second hole being aligned with the first hole when viewed from above the work machine; a third hole is disposed in the second plate, the third hole being aligned with the first hole and the second hole when viewed from above the work machine; 6. The work machine of claim 5, wherein the fastening members are inserted into the first holes, the second holes, and the third holes to secure the key plate, the first plate, and the second plate in the first position.

8. A fourth hole is provided on the first plate, and the fourth hole is arranged next to the key plate when viewed from above the work machine, a fifth hole is provided on the second plate, and the fifth hole is aligned with the fourth hole in a top view; 6. The work machine according to claim 5, wherein the fastening members are inserted into the fourth and fifth holes to secure the first and second plates in the first position.

9. In the first position, the first plate and the second plate are engaged by a clamp assembly in addition to being connected by the key plate; 2. The work machine of claim 1, wherein the clamp assembly includes two C-clamps engaging the first plate and the second plate at opposite longitudinal ends in the first position.

10. The work machine according to claim 5, wherein the fixing members include bolts, nuts, and washers.

11. The first contact surface of the key plate has a square shape when viewed from above, 2. The work machine according to claim 1, wherein the lower half of the key plate is composed of the first contact surface and four second contact surfaces that are inclined in different directions to form a quadrangular pyramid shape.

12. The first contact surface of the key plate has a circular shape when viewed from above, 2. The work machine according to claim 1, wherein the lower half of the key plate is comprised of the first contact surface and a second contact surface that is inclined in a conical shape.

13. A key plate for a work machine is provided, which has at least one first contact surface which is an upper surface in a cross-sectional view and at least one second contact surface which is an inclined surface; providing the key plate between a first plate and a second plate of the work machine, the first plate being a part of a cab riser of the work machine, the second plate being a part of a body of the work machine, the first plate being mounted vertically on the second plate; the key plate is disposed in a space formed in cross section by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate to secure the first plate and the second plate together, the second recess being vertically aligned with the first recess.

14. The method of claim 13, further comprising forming the key plate by cutting.

15. The method of claim 13, further comprising fixing the first plate to the second plate by fixing members extending from the first plate and the second plate.

16. The method described in claim 13, further characterized in that the key plate is fixed to at least one of the first plate or the second plate using a fixing member, and the key plate moves in conjunction with at least one of the first plate or the second plate.

17. The method of claim 13, further characterized in that the key plate is integrally formed as part of the first plate, and the first plate is rotatable vertically relative to the second plate.

18. A work machine according to any one of claims 1 to 12, comprising: a first plate that is vertically rotatable around a shaft of the work machine; and a key plate having at least one first contact surface that is an upper surface in a cross-sectional view and at least one second contact surface that is an inclined surface; A work machine, wherein the first plate and the key plate are adapted to be connected to one another and are inter-positioned.

19. Further comprising a second plate vertically aligned with the first plate; 19. The work machine according to claim 18, wherein the key plate is disposed in a space formed by a first recess on the lower surface of the first plate and a second recess on the upper surface of the second plate in a cross-sectional view to fix the first plate and the second plate together, the second recess being vertically aligned with the first recess.

20. A work machine as described in Claim 19, characterized in that the lower surface of the first plate and the upper surface of the second plate are arranged directly adjacent to each other with the first plate fixed to the second plate.

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