Construction machinery guard devices

Abstract

To provide a guard device for a construction machine allowing attachment work of a guard plate to be easily carried out.SOLUTION: A guard device 1 for a construction machine is provided with: guard plates 3 to cover windows of a cab 2 of the construction machine; a case 5 that is installed on a roof 4 of the cab and accommodates a guard plate in a horizontally placed state; rails that are provided on the case and withdrawably support the guard plate in a horizontal direction; and an engaging portion allowing the guard plate to be suspended and supported through engagement of the guard plate and the case when the guard plate is drawn out from the case.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a guard device for a construction machine. [Background technology]

[0002] In construction machines such as hydraulic excavators, a guard plate called a vandalism guard is attached to the cab to cover and protect the windows while the machine is parked, in order to prevent vandalism or other mischief to the windows. Generally, multiple guard plates are provided and are normally stored in a case installed on the roof of the cab. When installing the guard plates, they are removed one by one from the case and installed on the cab. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 7-31964 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when installing, the heavy guard plates must be removed one by one from their cases on the roof and then bolted in place, making the installation process laborious and tedious.

[0005] The present disclosure has been devised in light of the above circumstances, and has an object to provide a guard device for construction machinery that can facilitate the installation work of guard plates. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, A guard plate for covering the windows of the cab of a construction machine; a case that is installed on a roof of the cab and that stores the guard plate in a horizontal position; a rail provided on the case and supporting the guard plate so as to be horizontally removable; an engagement portion that engages the guard plate with the case when the guard plate is pulled out from the case, allowing the guard plate to be supported in a suspended state; The present invention provides a guard device for a construction machine, comprising:

[0007] Preferably, the engagement portion is a roller provided at a rear end of the guard plate in a drawing direction and capable of running on the rail; a stopper that is provided in the case and comes into contact with the roller when the guard plate is pulled out from the case; Equipped with.

[0008] Preferably, the guard device includes a restricting portion that restricts movement of the guard plate in a drawing direction when the guard plate is housed in the case.

[0009] Preferably, the restriction portion is a protruding member provided on the guard plate and protruding laterally; a hook provided on the case to hook the protruding member; Equipped with.

[0010] Preferably, the restriction portion includes a locking mechanism for locking the protruding member hooked on the hook.

[0011] Preferably, the guard plate is formed by connecting a plurality of divided guard plates in a foldable manner.

[0012] Preferably, adjacent divided guard plates are rotatably connected by a hinge.

[0013] Preferably, the case stores at least one of a front guard plate for covering a window on the front side of the cab, a rear guard plate for covering a window on the rear side of the cab, a left guard plate for covering a window on the left side of the cab, and a right guard plate for covering a window on the right side of the cab. Effect of the Invention

[0014] According to the present disclosure, the installation work of the guard plate can be facilitated. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view showing a guard device according to an embodiment of the present invention; [Diagram 2] 5A to 5D are five views showing the guard device of the present embodiment. [Diagram 3] FIG. [Figure 4] FIG. 13 is a perspective view showing a state in which the guard plate is engaged. [Diagram 5] FIG. 4 is a cross-sectional view showing a state in which the guard plate is engaged. [Figure 6] FIG. 4 is a perspective view showing a state in which the guard plate is stored. [Figure 7] FIG. 13 is a diagram showing a combination of a boss and a mounting hole. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 2, illustrating the configuration of a connecting portion of the split guard plate. [Figure 9] FIG. 11 is a cross-sectional view showing a restricting portion of a first modified example. [Figure 10] FIG. 11 is a vertical cross-sectional view showing a restricting portion of a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0017] 1 shows a schematic diagram of a guard device according to the present embodiment. The guard device 1 is applied to a construction machine (a hydraulic excavator in this embodiment) and protects a window (not shown) of a cab 2 thereof from vandalism and tampering. The guard device 1 comprises a guard plate 3 for covering the window of the cab, and a case 5 that is installed on the roof 4 of the cab 2 and stores the guard plate 3 in a horizontally placed state. When in use, the guard plate 3 is pulled out from the case 5 as shown in the figure, and is suspended from the case 5. At this time, the guard plate 3 is engaged with the case 5, and is supported by the case 5.

[0018] 1 is a reference diagram showing the configuration of this embodiment only in a schematic manner for ease of understanding. A more accurate configuration of this embodiment is shown in Figures 2 and onward. The front, rear, left, right, up and down directions in the drawings refer to the respective directions of the cab 2.

[0019] 2 is a five-view diagram showing the configuration of this embodiment in more detail, where (A) is a right side view, (B) is a front view, (C) is a left side view, (D) is a rear view, and (E) is a top view.

[0020] The cab 2 (shown by a dashed line) has a front side 2F, a rear side 2B, a left side 2L and a right side 2R in addition to the roof 4 mentioned above. Each of these sides is provided with windows 6F, 6B, 6L and 6R (collectively indicated by the reference symbol 6). The front portion of the roof 4 is also provided with a skylight 6U that can be tilted up by a hinge 7. A guard plate 3 covers these windows when in use.

[0021] The guard plates 3 include a front guard plate 3F that covers the window 6F and skylight 6U on the front surface 2F, a rear guard plate 3B that covers the window 6B on the rear surface 2B, a left guard plate 3L that covers the window 6L on the left side surface 2L, and a right guard plate 3R that covers the window 6R on the right side surface 2R. Since these guard plates have almost the same configuration, the following mainly describes the front guard plate 3F and its storage structure.

[0022] The window 6F on the front surface 2F is provided over almost the entire front surface 2F and has a generally rectangular shape that is long in the vertical direction. The skylight 6U is provided from the upper end of the front surface 2F to the front half of the roof 4.

[0023] The front guard plate 3F is formed into a substantially vertically long rectangle. The front guard plate 3F is configured by connecting a plurality of (four in this embodiment) divided split guard plates 8 in the longitudinal direction in a foldable manner. The front guard plate 3F includes first to fourth divided guard plates 8A to 8D that are arranged in order from the bottom when in use, and a pair of left and right hinges 9 that rotatably connect adjacent divided guard plates 8 to each other. The divided guard plates 8 are configured from metal plates such as iron or aluminum, but the material can be selected as appropriate.

[0024] The figure shows the state in which the front guard plate 3F covers the window 6F and the rooflight 6U when in use or deployed. When the front guard plate 3F is folded from this state, each divided guard plate 8 is folded so as to be rolled toward the front as seen from the front (horizontal outer side of the cab), as shown by the arrow a in the figure. That is, the lowest first divided guard plate 8A is pulled toward the front as seen from the front, rotated upward, and then overlapped on the front surface of the second divided guard plate 8B, which is the second from the bottom. This folding method of the guard plate 3 is called a valley fold. In this way, the front guard plate 3F is valley folded in order from the bottom, and finally the three divided guard plates 8A, 8B, and 8C from the bottom are stacked on top of the topmost divided guard plate 8D. In this stacked or layered state, the front guard plate 3F is pushed into the case 5 and stored.

[0025] The folding method is arbitrary, and for example, the folding may be performed by alternating valley folds and mountain folds like an inchworm. The positions of the multiple hinges 9 are preferably such that the hinges 9 do not interfere with each other as much as possible when folded.

[0026] 3 and 4 show the case 5. The case 5 has a lattice frame made of metal (iron, aluminum, etc.) and is formed into a generally rectangular parallelepiped shape. The case 5 is formed by assembling shaft-shaped members 10 (square pipes in this embodiment) to form each side of the rectangular parallelepiped. The case 5 has upper and lower frame parts 5A formed into a rectangular frame shape when viewed from above, and four pillar parts 5B connecting the upper and lower frame parts 5A at their four corners. As shown in FIG. 2, the case 5 has a front-to-rear length and a left-to-right width equivalent to those of the rear part of the roof 4 located behind the skylight 6U.

[0027] The case 5 is provided with rails 11 that support each guard plate 3 so that it can be pulled out horizontally. The rails 11 are formed of channel steel with a U-shaped (or angular U-shaped) cross section, and are arranged so as to open toward the inside of the case 5.

[0028] For example, the front guard plate 3F is supported by a pair of front rails 11F provided at the left and right ends of the case 5 and extending over substantially the entire front-to-rear length of the case 5.

[0029] Similarly, for the rear guard plate 3B, a pair of left and right rear rails 11B extend over substantially the entire front-to-rear length of the case 5. The rear rails 11B are positioned below and adjacent to the front rail 11F.

[0030] With respect to the left guard plate 3L, a pair of front and rear left rails 11L extend across almost the entire left-right width of the case 5. The left rail 11L is positioned below the rear rail 11B.

[0031] With respect to the right guard plate 3R, a pair of front and rear right rails 11R extend across almost the entire left-right width of the case 5. The right rail 11R is positioned below and adjacent to the left rail 11L.

[0032] Brackets 12 are provided on each outer surface of the case 5, corresponding to each guard plate 3 and forming an engagement portion and a restriction portion, which will be described later. The brackets 12 are formed from angle steel with an L-shaped cross section, and extend in the vertical direction over almost the entire height of the case 5. One surface of the bracket 12, i.e., the fixed surface 12A, is fixed to the case 5 by upper and lower bolts 13. The other surface of the bracket 12, i.e., the protruding surface 12B, protrudes toward the front of the case 5 (horizontally outward). A hook 14 is provided on the protruding surface 12B.

[0033] For example, for the front guard plate 3F, the fixing surfaces 12A of a pair of left and right brackets 12F corresponding thereto are fixed to the front portions and left and right ends of the upper and lower frame portions 5A of the case 5, respectively. A U-shaped or J-shaped hook 14 that opens upward is integrally provided on a protruding surface 12B that protrudes forward from the widthwise inner end of the fixing surface 12A of the bracket 12F. This hook 14 is positioned approximately on an extension line of the front rail 11F.

[0034] Similarly, a pair of left and right brackets (only their hooks 14 are shown) corresponding to the rear guard plate 3B are fixed to the rear surface of the case 5, a pair of front and rear brackets 12L corresponding to the left guard plate 3L are fixed to the left surface of the case 5, and a pair of front and rear brackets (only their hooks 14 are shown) corresponding to the right guard plate 3R are fixed to the right surface of the case 5.

[0035] 4 and 5 show the state when the front guard plate 3F is pulled out from the case 5 and engaged with the case 5. As shown in the figures, the front guard plate 3F is pulled out forward from the case 5 during use. Meanwhile, at the rear end of the front guard plate 3F in the pulling direction, i.e., at the rear end of the uppermost divided guard plate 8D, a roller 15 capable of running on the front rail 11F is provided. The roller 15 is rotatable around a shaft 16 fixed to the rear end of the divided guard plate 8D, and is positioned on the left and right sides of the rear end of the divided guard plate 8D. The fixing surface 12A of the bracket 12F is positioned at the front end position of the front rail 11F, and more specifically, the front end open portion of the front rail 11F is closed by the fixing surface 12A of the bracket 12F.

[0036] The front guard plate 3F, stored in the case 5 in a folded or stacked state, is pulled out forward when in use. At this time, the left and right rollers 15 run on the left and right front rails 11F to guide the movement in the pulling out direction. At the final stage of the pulling out, the rollers 15 hit the fixing surface 12A of the bracket 12F, thereby stopping the rollers 15 and engaging the front guard plate 3F with the case 5.

[0037] In this way, the fixing surface 12A of the bracket 12F constitutes a stopper 16 that comes into contact with the roller 15 when the front guard plate 3F is pulled out from the case 5. The roller 15 and the fixing surface 12A constitute an engagement portion 17 that engages the front guard plate 3F with the case 5 when the front guard plate 3F is pulled out from the case 5, allowing the front guard plate 3F to be supported in a suspended state.

[0038] 2, the front guard plate 3F that has been pulled out from the case 5 is then deployed and suspended from the case 5. At this time, the rear end of the front guard plate 3F is supported by the case 5, so that the deployment and installation work can be easily performed while part of the weight of the front guard plate 3F is supported by the case 5.

[0039] After deployment, the front guard plate 3F covers the skylight 6U and the window 6F on the front surface 2F, and is fixed at multiple points with bolts 18 to bosses (described later) provided on the front surface 2F of the cab. Because the rear end of the front guard plate 3F is supported by the case 5, the number of bosses and bolts 18 can be kept to a minimum. In this embodiment, there are only two fixing points, located on the left and right sides of the lower end of the lowest divided guard plate 8A.

[0040] 6 shows the state when the front guard plate 3F is folded and stored in the case 5. At this time, the engaged member or the protruding member provided on the front guard plate 3F is hooked on the above-mentioned hook 14, and the movement of the front guard plate 3F in the drawing direction is restricted.

[0041] As shown in Fig. 5, a shaft 19 is fixedly provided as a protruding member that protrudes to the left and right sides (only the left side is shown) at the front end of the split guard plate 8D in the pulling-out direction. A larger-diameter, disk-shaped retaining member or retaining plate 21 is provided at the tip of the shaft 19. When the shaft 19 is hooked onto the hook 14, the state shown in Fig. 6 is reached, and movement of the front guard plate 3F in the pulling-out direction is restricted. The retaining plate 21 prevents the shaft 19 from moving in the axial direction due to vibration or the like and coming off the hook 14.

[0042] In this way, the shaft 19 and the hook 14 constitute a restricting portion 22 that restricts movement of the front guard plate 3F in the pull-out direction when the front guard plate 3F is stored in the case 5. By providing such a restricting portion 22, it is possible to prevent the front guard plate 3F from being accidentally pulled out of the case 5 during normal storage.

[0043] The configurations described above with reference to Figs. 4 to 6 are the same for the other guard plates 3B, 3L, and 3R.

[0044] 7 shows a combination of a boss welded to the cab 2 and a mounting hole provided in the guard plate 3 corresponding to the boss. In (A) to (C), (a) is a front view of the mounting hole, (b) is a front view of the boss, and (c) is a side view (cross-sectional view or external view) of the boss.

[0045] The boss 23 shown in (A) is a typical cylindrical boss, and has a female screw hole 25 formed through the center. As shown in (c), one end of the boss 23 is welded to the cab 2, and the guard plate 3 is overlapped on the other end. The circular mounting hole 24 is arranged coaxially with the female screw hole 25, and the above-mentioned bolt 18 is inserted into the mounting hole 24 and then tightened into the female screw hole 25, fixing the guard plate 3 to the boss 23.

[0046] The boss 26 shown in (B) has a U-shaped cross section and has a nut 27 welded to the back surface thereof. The rest is the same as the boss 23 shown in (A).

[0047] The boss 28 shown in (C) is formed in a generally cylindrical shape with a circumferential groove 28A in the middle. A potbelly hole 29 is combined with this boss 28. After the large diameter portion of the potbelly hole 29 passes through the head of the boss 28, the guard plate 3 is lowered (moved in the planar direction) and the small diameter portion of the potbelly hole 29 fits into the circumferential groove 28A. This causes the potbelly hole 29 to engage with the boss 28 and will not come off unless an operation is performed in the reverse direction.

[0048] These bosses can be used appropriately as needed. The bottom surface of the boss 23 may be processed appropriately to match the shape and inclination of the outer surface of the cab 2. In order to improve the ease of mounting the guard plate 3, it is preferable to increase the number of bosses 28 of (C) as much as possible and to reduce the number of bosses 23, 26 of (A) and (B) as much as possible. For example, it is preferable to use the boss 28 of (C) only for positioning at the upper position, and use the boss 23, 26 of (A) or (B) for both positioning and fixing at the lower position.

[0049] Here, the guard plates 3 other than the front guard plate 3F will be described. As shown in Fig. 2, the window 6B of the rear face 2B covered by the rear guard plate 3B is provided in the upper half of the rear face 2B and has a substantially rectangular shape. The rear guard plate 3B is composed of a plurality of split guard plates 8E, 8F (two in this embodiment) that are foldably connected in the same manner as described above. The lower end portion of the lower split guard plate 8E is fixed to bosses on the rear face 2B at left and right positions by bolts 18.

[0050] The window 6L on the left side 2L covered by the left guard plate 3L includes a substantially vertically elongated rectangular door window 6La provided over almost the entire door 30, and a substantially vertically elongated rectangular rear window 6Lb provided in the upper half of the portion rearward of the door 30.

[0051] The left guard plate 3L is composed of a plurality of (three in this embodiment) divided guard plates 8G, 8H, 8I connected in a foldable manner in the same manner as above, and a divided guard plate 8J connected in a slidable manner to the divided guard plate 8I.

[0052] The split guard plates 8G, 8H cover the door window 6La, and the split guard plates 8I, 8J cover the rear window 6Lb. The split guard plates 8G, 8H are connected by a horizontal hinge 9 so as to be rotatable in the up-down direction, and the split guard plates 8H, 8I are connected by a vertical hinge 9 so as to be rotatable in the left-right direction.

[0053] The split guard plate 8J is connected to the lower end of the split guard plate 8I so as to be vertically slidable, and functions as if the split guard plate 8I is expanding and contracting, providing auxiliary coverage for the lower end of the rear window 6Lb that cannot be covered by the split guard plate 8I alone. The split guard plate 8J has the same width as the split guard plate 8I. A pair of connecting parts for the split guard plates 8I, 8J are provided at the front and rear.

[0054] When the left guard plate 3L is folded, the front lower divided guard plate 8G is first folded in a valley direction as shown by the arrow b in the figure, and then overlapped with the divided guard plate 8H above it. These two plates are then folded in a valley direction toward the rear, and overlapped with the rear divided guard plate 8I.

[0055] At the same time, split guard plate 8J is slid upward and overlapped to the maximum extent behind split guard plate 8I (i.e., retracted). Finally, with these four plates overlapped, left guard plate 3L is pushed into case 5 and stored. In the drawing, each split guard plate 8 when overlapped is indicated by a thin dashed line.

[0056] By configuring the left guard plate 3L in this manner, the left guard plate 3L, which is also long in the horizontal direction, can be folded up relatively small to a size that can be stored in the case 5 with limited dimensions. In particular, the total length of the split guard plates 8I, 8J when covering the rear window 6Lb is greater than the width of the roof 4 of the cab 2, i.e., the width of the case 5. However, by making the split guard plate 8J slidable and retractable, the total length can be shortened, and the size can be made small enough to be stored in the case 5.

[0057] The left guard plate 3L is bolted to the cab 2 only at two points, the front and the rear, of the lower end of the split guard plate 8G.

[0058] 8(A) shows the structure of the connection between split guard plates 8I and 8J. A bolt insertion hole 31 is provided at the lower end of split guard plate 8I, and an elongated hole 32 extending in the vertical direction is provided in split guard plate 8J. A bolt 33 is inserted through bolt insertion hole 31 and elongated hole 32, and a nut 34 is fastened to bolt 33.

[0059] When the left guard plate 3L is in use, the split guard plate 8J is pulled out (i.e. extended) to the maximum extent from the split guard plate 8I, and the nut 34 is tightened to fix the split guard plate 8J. When the left guard plate 3L is to be stored, the nut 34 is loosened and the split guard plate 8J is slid and retracted.

[0060] By making it possible to fix the split guard plate 8J to the split guard plate 8I in this way, it is no longer necessary to fix the split guard plate 8J to the cab 2 during use, and the number of bosses can be reduced.

[0061] The structure of this connecting portion can also be modified as shown in Fig. 8(B). In this modification, a cylindrical collar 50 is inserted into the bolt insertion hole 31 of the split guard plate 8I and the long hole 32 of the split guard plate 8J, and a bolt 33 is inserted into this collar 50. The length of the collar 50 is equal to or slightly longer than the total thickness of the split guard plates 8I and 8J.

[0062] On the other hand, at a position forward or rearward (forward in the illustrated example) of the long hole 32, the aforementioned mounting hole 24 is provided at the lower end of the split guard plate 8J, and a boss 23 corresponding to the mounting hole 24 is provided on the left side surface 2L of the cab 2.

[0063] The bolts 33 are constantly tightened and fixed by the nuts 34. However, because the amount of tightening is limited by the collars 50, the split guard plate 8J can still slide relative to the split guard plate 8I even in this state. In other words, unless restrained from elsewhere, the split guard plate 8J can always slide relative to the split guard plate 8I. During this sliding, the collars 50 slide within the elongated holes 32.

[0064] When the left guard plate 3L is in use, the split guard plate 8J is pulled out (i.e. extended) to its maximum extent from the split guard plate 8I, and the bolt 18 is inserted into the mounting hole 24 and then tightened to the boss 23. This fixes the split guard plate 8J so that it cannot slide. When the left guard plate 3L is stored, the bolt 18 is removed and the split guard plate 8J slides and retracts.

[0065] In this manner, in this modified example, the connection portion by the bolt 33 is always slidable, while the locking and unlocking of this sliding is performed by a separate bolt 18. Even in this way, it is possible to achieve the same function as the configuration in Fig. 8(A).

[0066] It should be noted that the shape and configuration of the left guard plate 3L (and window) shown in FIG. 2 is slightly different from that shown in FIG. 1, but it is possible to modify the shape and configuration to those shown in FIG.

[0067] Next, as shown in FIG. 2, the window 6R on the right side surface 2R covered by the right guard plate 3R is provided over almost the entire right side surface 2R and is formed by a single window having a substantially trapezoidal shape with its lower edge inclined upward toward the rear.

[0068] The right guard plate 3R is made up of a plurality of (four in this embodiment) divided guard plates 8K, 8L, 8M, and 8N that are foldably connected in the same manner as described above.

[0069] The split guard plates 8K, 8L are connected so as to be rotatable in the vertical direction by a pair of front and rear horizontal hinges 9, the split guard plates 8M, 8N are connected so as to be rotatable in the vertical direction by a pair of front and rear horizontal hinges 9, and the split guard plates 8L, 8N are connected so as to be rotatable in the left and right direction by a pair of top and bottom vertical hinges 9.

[0070] When the right guard plate 3R is folded, the front lower divided guard plate 8K is valley folded and overlapped with the divided guard plate 8L above it, as shown by the arrow c in the figure, and the rear lower divided guard plate 8M is valley folded and overlapped with the divided guard plate 8N above it.

[0071] Next, the two front plates are folded backwards and overlapped with the rear divided guard plate 8N. Finally, with these four plates overlapped, the right guard plate 3R is pushed into the case 5 and stored.

[0072] By configuring the right side guard plate 3R in this way, the right side guard plate 3R, which is long in the horizontal direction, can be folded up relatively small to a size that can be stored in the case 5 with limited dimensions. The right side guard plate 3R is bolted at only three locations, namely the lower ends of the split guard plates 8K, 8M, and 8N.

[0073] As described above, according to this embodiment, the engagement portion 17 is provided to engage the pulled-out guard plate 3 with the case 5 to allow the guard plate 3 to be supported in a suspended state. Therefore, the installation work can be performed while part of the weight of the guard plate 3 is supported by the case 5, making the installation work of the guard plate 3 easier.

[0074] Conventionally, when installing guard plates, it was necessary to repeatedly ascend and descend the construction machine and lower the heavy guard plates one by one from the case on the ceiling. However, in this embodiment, by simply pulling the guard plate 3 out of the case 5, the guard plate 3 can be deployed by its own weight while the rear end of the guard plate 3 is supported by the case 5. This eliminates the need to repeatedly ascend and descend the construction machine, improving workability and safety.

[0075] Conventionally, a similar problem occurs when storing the guard plate in the case. According to this embodiment, the guard plate 3 can be stored in the case 5 simply by folding the guard plate 3 while supporting the rear end of the guard plate 3 with the case 5, and pushing the guard plate 3 into the case 5. Therefore, according to this embodiment, the task of storing the guard plate 3 can be made easier.

[0076] Furthermore, according to this embodiment, the number of fixing points using the bolts 18 can be reduced, so that the number of operations for attaching and detaching the bolts 18 can be reduced, and the number of bosses can also be reduced.

[0077] Here, when attaching the boss to the cab 2, the boss is welded to the cab 2, an anti-rust seal is applied to the welded part, and the entire cab including the boss and the anti-rust seal part is baked. However, air pockets in the anti-rust seal part may burst during the baking paint process, making it necessary to make corrections to the paint.

[0078] Conventionally, guard plates are bolted to the cab one by one, so a large number of bosses are required, equal to the number of guard plates multiplied by the number of bosses per plate. This inevitably increases the number of areas that require paint correction, which adds to the cost of the guard device and tends to make the cost higher.

[0079] However, according to the present embodiment, the number of bosses can be reduced compared to the conventional case, so that an increase in cost due to painting correction can be avoided, and the cost of the guard device can be reduced.

[0080] Furthermore, according to this embodiment, not only the number of bosses but also the types of bosses can be reduced, which in itself can reduce the cost of the guard device.

[0081] Furthermore, according to this embodiment, the guard plate 3 has a structure in which split guard plates 8 are connected by hinges 9. This allows for a high degree of freedom in the shape of the guard plate 3, and it can easily follow the shape of the outer surface of the cab. In addition, there is a high degree of freedom in the direction of the boss, so it may be possible to omit machining of the bottom surface of the boss.

[0082] Next, a modified example will be described. Note that the same reference numerals are given to the same parts as those in the basic embodiment, and the description thereof will be omitted. The following mainly describes the differences from the basic embodiment.

[0083] (First Modification) As shown in FIG. 9, the restricting portion 22 of the guard device according to the first modification includes a locking mechanism 35 that locks the shaft 19 hooked on the hook 14.

[0084] The lock mechanism 35 of this modified example is formed by a hinge 36. The hinge 36 has first and second hinge plates 38, 39 rotatably connected to each other by a hinge shaft 37. The first hinge plate 38 is fixed to the fixing surface 12A of the bracket 12 by a bolt 40. As shown in the figure, the second hinge plate 39 can be overlapped on the protruding surface 12B of the bracket 12. The second hinge plate 39 is biased in a direction approaching the protruding surface 12B by a spring (not shown).

[0085] The second hinge plate 39 is provided with a lock hole 41 into which the retaining plate 21 is inserted and fitted. By inserting and fitting the retaining plate 21 into the lock hole 41 in this manner, the retaining plate 21 cannot rise, and the shaft 19 can be prevented from coming off the hook 14. In other words, the shaft 19 can be locked in a state where it is engaged with the hook 14.

[0086] When the retaining plate 21 is omitted, the shaft 19 may be inserted into a lock hole 41 having a smaller diameter.

[0087] When the shaft 19 is to be hooked onto the hook 14, the second hinge plate 39 is first moved away from the protruding surface 12B against the force of the spring and is held in this state. At this time, the second hinge plate 39 can be conveniently operated by holding a tab 42 provided on the second hinge plate 39. After the shaft 19 is hooked onto the hook 14 in this state, the second hinge plate 39 is released. Then, as shown by the arrow a, the second hinge plate 39 is automatically moved closer to the protruding surface 12B by the spring, and at the same time, the second hinge plate 39 overlaps with the protruding surface 12B, and the lock hole 41 fits into the retaining plate 21. This achieves the locking of the shaft 19.

[0088] (Second Modification) 10, the restricting portion 22 of the guard device according to the second modification also includes a locking mechanism 35. The locking mechanism 35 of this modification has a pair of engaging pieces, i.e., first and second engaging pieces 43, 44, which are engageable with each other.

[0089] The first engagement piece 43 is fixed to the tip of the shaft 19 in place of the retaining plate 21. The first engagement piece 43 has a tapered surface 45 that approaches the shaft 19 side as it extends downward, and a stepped surface 46 that extends in the axial direction of the shaft 19 from the upper end of the tapered surface 45 toward the shaft 19 side.

[0090] The second engagement piece 44 is fixed to the hook 14 by a bolt 47 and has a generally crank-shaped cross-sectional shape. The second engagement piece 44 has a tapered surface 48 that approaches the shaft 19 as it extends downward, and a step surface 49 that extends in the axial direction of the shaft 19 from the lower end of the tapered surface 48 toward the opposite side to the shaft 19.

[0091] When the shaft 19 is hooked onto the hook 14, the shaft 19 and the first engagement piece 43 are lowered as indicated by the arrow a, and the tapered surface 45 of the first engagement piece 43 slides down on the tapered surface 48 of the second engagement piece 44. In accordance with this descent, the second engagement piece 44 is elastically deformed toward the side opposite the shaft 19, but when the tapered surface 45 of the first engagement piece 43 passes the tapered surface 48 of the second engagement piece 44, the second engagement piece 44 springs back to its original shape as shown in the figure, and the stepped surface 46 of the first engagement piece 43 engages with the stepped surface 49 of the second engagement piece 44. As a result, the shaft 19 is automatically locked at the same time as it is hooked onto the hook 14.

[0092] To release this lock when the guard plate 3 is in use, the second engagement piece 44 is held and elastically deformed in the direction away from the shaft 19 .

[0093] Although the embodiment of the present disclosure has been described in detail above, various other embodiments and modifications of the present disclosure are possible.

[0094] (1) For example, the guard plate 3 does not have to be made up of multiple divided guard plates 8, and may be made up of a single guard plate 3.

[0095] (2) Regarding the engaging portion 17, the roller 15 provided on the guard plate 3 may be replaced with a slider that simply slides on the rail 11.

[0096] (3) It is not necessary for the case 5 to house all of the four guard plates 3F, 3B, 3L, and 3R on the front, rear, left, and right sides, and it is acceptable to house only some of them.

[0097] The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents encompassed within the spirit of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the spirit of the present disclosure. [Explanation of symbols]

[0098] 1 Guard device 2 Cab 2F front 2B Rear 2L left side 2R Right side 3 Guard plate 3F front guard plate 3B Rear guard plate 3L Left side guard plate 3R Right side guard plate 4. Roof 5 Cases 6. Windows 8 Split guard plate 9 Hinge 11 Rail 14 Hook 15. Lola 16 Stopper 17 Engagement part 19 Shaft 35 Locking mechanism

Claims

1. A guard plate for covering the windows of the cab of a construction machine; a case that is installed on a roof of the cab and that stores the guard plate in a horizontal position; a rail provided on the case and supporting the guard plate so as to be horizontally removable; an engagement portion that engages the guard plate with the case when the guard plate is pulled out from the case, allowing the guard plate to be supported in a suspended state; a restricting portion that restricts movement of the guard plate in a pull-out direction when the guard plate is housed in the case; Equipped with The regulating portion is a protruding member provided at a front end of the guard plate in a drawing direction and protruding laterally; a hook provided on the case to hook the protruding member; Equipped A guard device for a construction machine.

2. The engagement portion is a roller provided at a rear end of the guard plate in a drawing direction and capable of running on the rail; a stopper that is provided in the case and comes into contact with the roller when the guard plate is pulled out from the case; Equipped A guard device for a construction machine according to claim 1.

3. The restriction portion includes a lock mechanism that locks the protruding member hooked on the hook.

3. A guard device for a construction machine according to claim 1 or 2.

4. The guard plate is configured by connecting a plurality of divided guard plates in a foldable manner. A guard device for a construction machine according to any one of claims 1 to 3.

5. The adjacent divided guard plates are rotatably connected by hinges.

5. A guard device for a construction machine according to claim 4.

6. At least one of a front guard plate for covering a window on the front side of the cab, a rear guard plate for covering a window on the rear side of the cab, a left guard plate for covering a window on the left side of the cab, and a right guard plate for covering a window on the right side of the cab is stored in the case. A guard device for a construction machine according to any one of claims 1 to 5.

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