Work Machine

Abstract

To provide a work machine allowing a cab to be prevented from immediately falling even when a joint part between a hydraulic cylinder and the cab is damaged.SOLUTION: A work machine is provided with a cradle 7 placed on the rear of a cab 4 and having a guide rail 6 guiding a cab deck 5 in vertical motion, and a hydraulic cylinder 10 of which a tube 10b side is fixed on a super structure 2 or the cradle 7 to lift and lower the cab deck 5. The cab deck 5 comprises a mount part 8 on which the cab 4 is mounted and which extends in a horizontal direction, a cylinder joint part 9 erected on the rear of the mount part 8, and a guided part 11 arranged in a rear end of the mount part 8 and moving along the guide rail 6. A rod tip 10a of the hydraulic cylinder 10 is connected to the cylinder joint part 9 through a joint bracket 12 arranged on an upper end of the cylinder joint part 9, and the joint bracket 12 and the rod tip 10a are covered from above with a top plate part 21 of a fall prevention member 20 arranged on an upper end of the cylinder joint part 9.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work machine, such as a construction machine, having a liftable cab. [Background technology]

[0002] Conventionally, as disclosed in Patent Document 1, for example, a work machine has been known in which a plurality of hydraulic cylinders for raising and lowering the upper separate box are interposed between the upper separate box and the lower separate box, vertically connecting the vicinity of the floor and the vicinity of the ceiling in the cab, so that the upper separate box can be easily raised and lowered via these cylinders.

[0003] Also, as shown in Patent Document 2, a working machine is known that has a cab that can be raised and lowered, which is provided with a cab deck that is arranged to be able to rise and lower at the front of the body and on which the cab is placed, a stand that is arranged on the working machine body behind the cab and on which a guide rail that guides the raising and lowering of the cab deck is provided, and a cylinder that raises and lowers the cab deck, and the cab deck has a placement part that faces substantially horizontally and on which the cab is placed, a vertical part that stands on the placement part, and a moving member for moving on the guide rail. In this working machine, the tip part of the rod is connected to the upper end part of the vertical part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 4-125921 [Patent Document 2] JP 2015-40437 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional work machines, the tip of the rod is simply connected to the upper end of the vertical portion, and so if this connection breaks, the cab will fall along the guide rail, which is a problem.

[0006] The present invention has been made in consideration of the above points, and its purpose is to prevent the cab from immediately falling even if the connection between the hydraulic cylinder and the cab is damaged. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a fall prevention member for preventing the cab from falling.

[0008] Specifically, in the first invention, a cab deck arranged in a liftable manner at the front of the work machine body and on which a cab is placed; a platform disposed on the work machine body behind the cab and having a guide rail for guiding the lifting and lowering movement of the cab deck; a hydraulic cylinder having a lower end portion fixed to the frame or the working machine body and configured to raise and lower the cab deck, The cab deck is a horizontally extending placement portion on which the cab is placed; a cylinder connection portion provided upright at a rear portion of the mounting portion; a guided portion provided at a rear end of the placement portion or at a cylinder connection portion and movable along the guide rail; an upper end of the hydraulic cylinder is connected to the cylinder connecting portion via a connecting bracket provided at an upper end of the cylinder connecting portion; The connecting bracket and the upper end of the cylinder are covered from above by a top plate portion of a fall prevention member provided at the upper end of the cylinder connecting portion.

[0009] According to the above configuration, even if the welded portion of the connecting bracket connecting the upper end of the hydraulic cylinder breaks, or the cylinder connecting pin connecting the upper end of the cylinder to the connecting bracket breaks, the connecting bracket and the upper end of the cylinder are covered from above by the top plate portion of the fall prevention member provided at the upper end of the cylinder connection portion, and this fall prevention member rests on the upper end of the cylinder and supports the weight of the cab, so that the cab will not immediately fall.

[0010] In the second invention, in the first invention, The fall prevention member has a lower end portion fixed to the cylinder connection portion below the welded portion of the connection bracket, and a middle portion extending upward along the cylinder connection portion.

[0011] According to the above configuration, even if the welded portion of the connecting bracket breaks, the lower end of the fall prevention member remains fixed to the cylinder connection portion without being affected by the breakage, so that the cab is supported on the hydraulic cylinder with the top plate portion of the fall prevention member resting on the connecting bracket and the upper end of the cylinder.

[0012] In a third aspect of the present invention, in the first or second aspect of the present invention, The lower surface of the top plate of the fall prevention member is spaced a predetermined distance above the connecting bracket and the upper end of the cylinder.

[0013] According to the above configuration, if the welded portion of the connecting bracket that connects the upper end of the hydraulic cylinder breaks, or if the cylinder connecting pin that connects the upper end of the cylinder to the connecting bracket breaks, the cab will fall a certain distance before the top plate hits the connecting bracket or the upper end of the cylinder, so the operator will notice the abnormality due to the impact and sound. This prevents the operator from continuing work without noticing the damage, which could result in damage to the fall prevention member.

[0014] In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, The edge of the top plate of the fall prevention member is provided with a side-slip prevention edge that extends downward and prevents the top plate, which has climbed up onto the connecting bracket and the upper end of the cylinder, from coming off.

[0015] According to the above configuration, even if the connecting bracket and its surroundings are deformed to a certain extent at the time of breakage, the anti-slip edge extending downward from the edge of the top plate of the fall prevention member can prevent the top plate that has climbed up onto the connecting bracket and the upper end of the cylinder from sliding sideways and coming off, thereby further improving safety in the event that the connection with the upper end of the cylinder is damaged.

[0016] In a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, The cylinder upper end of the hydraulic cylinder is pin-connected to the connecting bracket by a cylinder connecting pin, At least a part of the fall prevention member covers the axial side surface of the cylinder connecting pin at the upper end of the cylinder, and has a cylinder connecting pin insertion hole or notch in the portion through which the cylinder connecting pin is inserted.

[0017] According to the above configuration, even if the anti-fall member covers the axial side of the cylinder connecting pin at the upper end of the cylinder, the cylinder connecting pin can be inserted through the cylinder connecting pin insertion hole or notch, so that the operation of attaching and detaching the cylinder connecting pin is not hindered. Effect of the Invention

[0018] As described above, according to the present invention, the connecting bracket at the rear of the cab deck on which the cab rests and the upper end of the hydraulic cylinder that raises and lowers the cab deck are covered from above by the top plate portion of the fall prevention member provided at the upper end of the cylinder connection portion, so that even if the connection portion between the hydraulic cylinder and the cab is damaged, the cab can be prevented from immediately falling. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a side view showing an upper rotating body of the work machine with the cab in a lowered position. [Diagram 2] FIG. 2 is a side view showing an upper rotating body of the work machine with the cab in a raised position. [Diagram 3]FIG. 4 is an enlarged perspective view showing the placement portion, the cylinder connection portion, and the platform when the cab is in a raised position. [Figure 4] FIG. 4 is an exploded perspective view showing the placement portion, the cylinder connection portion, and the platform with the cab in a lowered position. [Diagram 5] FIG. 4 is an enlarged perspective view showing a rail and a guided portion. [Figure 6] 1 is an enlarged perspective view showing a fall prevention member and its surroundings according to an embodiment of the present invention; [Figure 7] 2 is an enlarged side view showing a fall prevention member and its surroundings according to an embodiment of the present invention. FIG. [Figure 8] 1 is an exploded perspective view showing an enlarged view of a fall prevention member and its surroundings according to an embodiment of the present invention. [Figure 9] 1 is an enlarged perspective view showing a fall prevention member and its periphery according to a first modified example of an embodiment of the present invention. FIG. [Figure 10] 1 is an enlarged side view showing a fall prevention member and its periphery according to a first modified example of an embodiment of the present invention. FIG. [Figure 11] 1 is an exploded perspective view showing an enlarged view of a fall prevention member and its periphery according to a first modified example of an embodiment of the present invention. FIG. [Figure 12] 11 is an enlarged perspective view showing a fall prevention member and its periphery according to a second modified example of the embodiment of the present invention. FIG. [Figure 13] 11 is an enlarged side view showing a fall prevention member and its periphery according to a second modified example of the embodiment of the present invention. FIG. [Figure 14] 11 is an exploded perspective view showing an enlarged view of a fall prevention member and its periphery according to a second modified example of an embodiment of the present invention. FIG. [Figure 15] FIG. 11 is an enlarged perspective view showing a fall prevention member and its periphery according to a third modified example of the embodiment of the present invention. [Figure 16] 11 is an enlarged side view showing a fall prevention member and its periphery according to a third modified example of the embodiment of the present invention. FIG. [Figure 17] FIG. 11 is an exploded perspective view showing an enlarged view of a fall prevention member and its periphery according to a third modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] (Embodiment 1) 1 and 2 show the main parts of a hydraulic excavator 1 as a work machine according to an embodiment of the present invention, and although not shown in detail, the hydraulic excavator 1 comprises an upper rotating body 2 as the work machine main body, a lower traveling body such as crawlers and wheels, and an attachment provided at the front end of the upper rotating body 2 so as to be capable of being raised and lowered. The attachment is not limited to a bucket, a crusher, a magnetic fork, etc. The lower traveling body may be a structure that does not travel, such as a deck.

[0022] The upper rotating body 2 has a rotating frame 3 made of a welded structure such as steel plate, which is connected to a lower traveling body by a rotating bearing (not shown), and a cab 4 for an operator is provided on the side of the front attachment of the rotating frame 3 so that it can be raised and lowered. Although not shown, the cab 4 is equipped with a seat for the operator, operating levers, etc. The cab 4 is placed on a cab deck 5, and depending on the model, it may weigh more than 1 ton.

[0023] 3 and 4, a vertically extending platform 7 is fixed to the rear of the cab 4 on the revolving frame 3. This platform 7 has guide rails 6 that extend substantially vertically and guide the ascending and descending movement of the cab deck 5. In some cases, the guide rails 6 may not be perpendicular to the surface on which the hydraulic excavator 1 is placed, but may be inclined forward or backward. In that case, the cab 4 moves forward and backward as it ascends and descends, in accordance with the inclination.

[0024] As shown in Fig. 4, the lower end of the hydraulic cylinder 10, which is the cylinder lower end portion, on the tube 10b side is fixed to a cylinder mounting portion 7a at the bottom of the base 7. Although not shown, hydraulic piping from a hydraulic source of the hydraulic excavator 1 is connected to the hydraulic cylinder 10 via a control valve or the like, and the hydraulic cylinder 10 is adapted to be expanded or contracted by the operation of an operator. Note that the tube 10b of the hydraulic cylinder 10 may be fixed to the upper rotating body 2 instead of the base 7.

[0025] The cab deck 5 has a platform-like mounting portion 8 extending horizontally on which the cab 4 is placed, and a cylinder connection portion 9 standing substantially vertically on the rear of the mounting portion 8. The mounting portion 8 is made of, for example, a welded structure made by welding steel plates or the like, and guided portions 11 that fit into the guide rails 6 and move along the guide rails 6 are provided on the left and right sides of the rear end of the mounting portion 8.

[0026] Specifically, the guided portion 11 includes, for example, as shown enlarged in Figure 5, an outer guided portion 11a that covers the outer rail portion 6a, which is provided so as to extend vertically on the left and right outer sides of the frame 7, from the left and right outer sides, and an inner guided portion 11b that fits into an inner rail portion 6b that is provided on the frame 7 in a detachable manner so as to be parallel to the outer rail portion 6a.

[0027] In addition, the outer rail portion 6a and the outer guided portion 11a do not have the function of guiding the ascending and descending movement of the cab deck 5. Rather, they are auxiliary means to prevent the cab deck 5 and the cab from falling in the forward / backward or left / right directions even if the inner rail portion 6b and the inner guided portion 11b become detached due to some factor, by the outer rail portion 6a getting caught on the outer guided portion 11a.

[0028] The cab deck 5 is allowed to move up and down while being restricted in movement in the left-right and front-rear directions by the guide rails 6 and the guided parts 11. Note that the shapes and configurations of the guide rails 6 and the guided parts 11 are not limited to this example, and may be composed of, for example, only the inner rail parts 6b and the inner guided parts 11b.

[0029] In addition, harnesses, piping, etc. connecting to electrical equipment, hydraulic parts, etc. in the cab 4 are protected by a piping protection section 14 so as not to impede the raising and lowering movement of the cab 4.

[0030] As shown enlarged in Figs. 6 to 8, the cylinder connection part 9 is mainly made of a channel steel with a C-shaped cross section, which extends substantially vertically and is welded or bolted to the mounting part 8. The cylinder connection part 9 has a plate-like vertical part 9a extending substantially vertically and side parts 9b extending rearward from both sides thereof, and a connection bracket 12 having a through hole 12a for inserting a pin is welded and fixed to the upper end rear surface of the vertical part 9a. The connection bracket 12 is plate-like and extends downward in a smooth curve. The upper end of the side part 9b of the cylinder connection part 9 has a notch 9c cut obliquely, which makes it easy to connect the rod tip 10a, which serves as the cylinder upper end part of the hydraulic cylinder 10. The rod tip 10a is then inserted so that the clevis through hole of the rod tip 10a is aligned with the pin insertion through hole 12a of the connection bracket 12, and the cylinder connection pin 13 is inserted into both through holes and prevented from coming out by the anti-slip plate 13a, whereby the rod tip 10a is pin-connected to the cylinder connection part 9.

[0031] The connection bracket 12 and the rod tip 10a are covered from above by a top plate portion 21 of a fall prevention member 20 provided at the upper end of the cylinder connection portion 9.

[0032] The fall prevention member 20 of this embodiment is, for example, a fall prevention member main body 22 formed by bending a pair of steel bars having a rectangular cross section so that the corners are rounded, and a rectangular plate-shaped top plate portion 21 is welded and fixed to the fall prevention member main body 22. The front side of the fall prevention member main body 22 is reinforced by a front reinforcing plate 24.

[0033] In addition, a skid prevention edge 23 is formed by bending the rear edge of the top plate 21 of the fall prevention member 20, which extends downward and prevents the top plate 21 from coming off the connection bracket 12 and the rod tip 10a. The height of the skid prevention edge 23 may be such that it abuts when the top plate 21 skids and does not come off the rod tip 10a when the connection bracket 12 and its periphery are broken and the top plate 21 is placed on the rod tip 10a. The skid prevention edge 23 may be fixed to the fall prevention member main body 22 by bolt fastening or the like, or may be provided not only at the rear but also on the left and right sides as in the left-right skid prevention edge 123 of the following modified example 1.

[0034] The shape of the fall prevention member 20 is not limited to this, and may be any of the modified examples described below.

[0035] 7, in this embodiment, the lower surface of the top plate 21 of the fall prevention member 20 is provided above the connection bracket 12 and the rod tip 10a at a predetermined distance h. The distance h is not particularly limited, but may be, for example, h=25 mm.

[0036] Next, the operation of the fall prevention member 20 according to this embodiment will be described.

[0037] If a load is applied to the cab 4 or the like such that the connection bracket 12 and its surroundings are deformed, the welded portion of the connection bracket 12 may break or the cylinder connection pin 13 may break.

[0038] Even in such a case, the weight of the cab 4 is supported by the hydraulic cylinder 10 with the top plate portion 21 of the fall prevention member 20 resting on the upper end of the connecting bracket 12 and the rod tip 10a, so the cab 4 will not fall immediately.

[0039] In addition, the anti-slip edge 23 formed by bending the edge of the top plate portion 21 prevents the top plate portion 21, which has climbed up onto the connecting bracket 12 and the rod tip 10a, from sliding off, thereby further improving safety in the event that the connection portion with the rod tip 10a is damaged.

[0040] In addition, while the top plate 21 hits the connecting bracket 12 or the rod tip 10a, the cab 4 falls by a predetermined distance h, so the operator notices the abnormality due to the impact and sound. This prevents the operator from continuing work without noticing the damage, which could result in damage to the fall prevention member.

[0041] Therefore, according to the hydraulic excavator 1 according to this embodiment, even if the connection between the hydraulic cylinder 10 and the cab 4 is damaged, the cab 4 can be prevented from immediately falling.

[0042] -Variation 1- 9 to 11 show a first modified example of the embodiment of the present invention, which differs from the above embodiment in that the shape of the fall prevention member 120 is different. In the following modified examples, the same parts as those in Figs. 1 to 8 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0043] In this modification, the main member of the fall prevention member 120 is formed by bending a steel plate. Specifically, the fall prevention member 120 of this modification is formed by bending a steel plate of a predetermined thickness into an inverted L-shape in side view, for example. The portion of the fall prevention member main body 122 extending downward of the fall prevention member 120 may be reinforced by a pair of reinforcing ribs 124.

[0044] At the lower end of the fall prevention member 120, on the front surface of the cylinder connection part 9, below the welded portion of the connection bracket 12, a plate-shaped lower end part 125 is fixed by welding or the like.

[0045] In this modified example, even if the welded portion of the connecting bracket 12 breaks, the fall prevention member 120 remains fixed to the front surface of the cylinder connection portion 9 without being affected by the breakage, so that the cab 4 is supported by the hydraulic cylinder 10 with the top plate portion 21 of the fall prevention member 120 resting on the connecting bracket 12 and the rod tip 10a.

[0046] In other words, if the lower end 125 of the fall prevention member 120 is located close to the welded portion of the connecting bracket 12, when the welded portion of the connecting bracket 12 breaks, a crack may propagate leading to the break, or stress may be directed toward the lower end 125 of the fall prevention member 120, leading to the breakage of the lower end of the fall prevention member 120, but this has the advantage of eliminating such a possibility.

[0047] The edge of the top plate 21 of the fall prevention member 120 of this modified example is formed with a bent anti-slip edge 23 that extends downward and prevents the top plate 21 from coming off when it rides up on the connection bracket 12 and the rod tip 10a, but in this modified example, a left-right anti-slip edge 123 is also provided in the left-right direction. The left-right anti-slip edge 123 is provided with a cylinder pin insertion notch 123a for inserting and removing the cylinder connection pin 13.

[0048] -Variation 2- 12 to 14 show a second modified example of the embodiment of the present invention, which differs from the above embodiment in that the shape of the drop prevention member 220 is different.

[0049] The rod tip 10a of the hydraulic cylinder 10 is pin-connected to the connecting bracket 12 by a cylinder connection pin 13, but in this modified example, at least a part of the fall prevention member body 222 of the fall prevention member 220 covers the axial side of the cylinder connection pin 13 (pin insertion through hole 12a) at the rod tip 10a.

[0050] Specifically, the fall prevention member 220 of this modified example has an inverted U shape, and fall prevention member bodies 222 extend downward from both ends of a top plate portion 221. The pair of left and right fall prevention member bodies 222 are fixed to a portion of the side surface portion 9b of the cylinder connection portion 9 where the notch 9c is located by welding or the like.

[0051] At least one of the pair of left and right fall prevention member bodies 222 has a cylinder connecting pin insertion hole 226 formed therethrough, through which the cylinder connecting pin 13 is inserted.

[0052] After the cylinder connecting pin 13 is inserted into the pin insertion through hole 12a, it is sufficient to prevent it from falling out by the anti-slip plate 13a at the rod tip 10a, so the cylinder connecting pin insertion hole 226 only needs to be provided in one of the fall prevention member bodies 222.

[0053] In this modified example, even if the fall prevention member 220 covers the axial side of the cylinder connecting pin 13 at the rod tip 10a, the cylinder connecting pin 13 can be inserted into the pin insertion through hole 12a through the cylinder connecting pin insertion hole 226, so that the removal and installation work of the cylinder connecting pin 13 is not hindered.

[0054] -Variation 3- 15 to 17 show a third modification of the embodiment of the present invention, which differs from the above embodiment in that the shape of the drop prevention member 320 is different.

[0055] In this modified anti-fall member 320, the top plate portion 321 and the connecting bracket 312 are integral, and this top plate portion 321 is detachably connected to a lower end portion 322 fixed to the cylinder connecting portion 9 of the anti-fall member 320 via a screw shaft 325.

[0056] Specifically, the connection bracket 312 has the same shape as in the above embodiment, and a plate-shaped top plate portion 321 is welded to its upper surface. The top plate portion 321 has a substantially triangular rice ball shape that covers the clevis portion of the rod tip end 10a of the hydraulic cylinder 10 at least in a plan view. A pair of bolt insertion through holes (not shown) are formed through the front side of the top plate portion 321.

[0057] The lower end portion 322 of this modified example is in the shape of a plate covering the vertical portion 9a of the cylinder connection portion 9 and part of the side portions 9b on both sides thereof, and has a pair of bolt insertion through holes (not shown) formed therethrough at positions corresponding to the pair of bolt insertion through holes in the top plate portion 321, and is welded and fixed at the cylinder connection portion 9 considerably below the welded portion of the connection bracket 312.

[0058] Then, the connecting bracket 312, to which the top plate portion 321 is integral, is welded to the cylinder connecting portion 9, and then a screw shaft 325 is inserted into a pair of bolt insertion through holes in the top plate portion 321 and a pair of bolt insertion through holes in the lower end portion 322, and nuts 326 are fastened so as to sandwich the lower end portion 322 from above and below, thereby connecting the top plate portion 321 and the lower end portion 322.

[0059] In this modified example, since the top plate portion 321 and the connecting bracket 312 are integral, even if the weld between the cylinder connecting portion 9 and the connecting bracket 312 breaks, the top plate portion 321 together with the connecting bracket 312 rests on the rod tip 10a and supports the weight of the cab 4.

[0060] (Other embodiments) The present invention may be configured as follows with respect to the above embodiment.

[0061] That is, in the above embodiment, the work machine is the hydraulic excavator 1, but is not limited to this, and may be any work machine having a liftable cab, such as a crane.

[0062] In the above embodiment, the lower end of the tube 10b of the hydraulic cylinder 10 is connected to the cylinder mounting portion 7a of the stand 7, but the arrangement may be reversed so that the rod tip 10a becomes the lower end of the cylinder and is connected to the cylinder mounting portion 7a, and the upper end of the tube 10b becomes the upper end of the cylinder and is connected to the cylinder connection portion 9 by the cylinder connection pin 13.

[0063] In the above embodiment, the lower end of the hydraulic cylinder 10 is connected to the frame 7, but in some cases, it may be connected to the upper rotating body 2 (upper frame, rotating frame).

[0064] It should be noted that the above-described embodiments are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0065] 1. Hydraulic excavator (working machine) 2 Upper rotating body (main body of the work machine) 3 Swivel frame 4 Cab 5 Cab Deck 6 Guide rail 6a Outer rail section 6b Inner rail section 7 Mounting 7a Cylinder mounting part 8 Placement part 9 Cylinder connection 9a Vertical section 9b Side part 9c Notch 10 Hydraulic cylinder 10a Rod end (top end of cylinder) 10b Tube (bottom end of cylinder) 11 Guided part 11a Outer guided portion 11b Inner guided part 12 Connecting bracket 12a Pin insertion hole 13 Cylinder connecting pin 13a Stopper plate 14 Pipe protection section 20 Fall prevention parts 21 Top plate 22 Fall prevention member body 23 Anti-skid edge 24 Front reinforcement plate 120 Fall prevention parts 122 Fall prevention member body 123 Sideways skid prevention edge 123a Cylinder pin insertion notch 124 Reinforcing rib 125 Lower end 220 Fall prevention parts 221 Top plate 222 Fall prevention member body 226 Cylinder connection pin insertion hole 312 Connection bracket 320 Fall prevention parts 321 Top plate 322 Lower end 325 screw shaft 326 Nut

Claims

1. a cab deck arranged in a liftable manner at the front of the work machine body and on which a cab is placed; a platform disposed on the work machine body behind the cab and having a guide rail for guiding the lifting and lowering movement of the cab deck; a hydraulic cylinder having a lower end portion fixed to the frame or the working machine body and configured to raise and lower the cab deck, The cab deck is a horizontally extending placement portion on which the cab is placed; a cylinder connection portion provided upright at a rear portion of the mounting portion; a guided portion provided at a rear end of the placement portion or at a cylinder connection portion and movable along the guide rail; an upper end of the hydraulic cylinder is connected to the cylinder connecting portion via a connecting bracket provided at an upper end of the cylinder connecting portion; The connecting bracket and the upper end of the cylinder are covered from above by a top plate portion of a fall prevention member provided at the upper end of the cylinder connecting portion. A working machine characterized by:

2. The fall prevention member has a lower end portion fixed to the cylinder connection portion below the welded portion of the connection bracket, and an intermediate portion extending upward along the cylinder connection portion.

2. A work machine according to claim 1.

3. The lower surface of the top plate of the fall prevention member is provided at a predetermined distance above the connecting bracket and the upper end of the cylinder.

3. A work machine according to claim 1 or 2.

4. The edge of the top plate of the fall prevention member is provided with a side-slip prevention edge that extends downward and prevents the top plate that has climbed up onto the connecting bracket and the upper end of the cylinder from coming off. A work machine according to any one of claims 1 to 3.

5. The cylinder upper end of the hydraulic cylinder is pin-connected to the connecting bracket by a cylinder connecting pin, At least a part of the fall prevention member covers the axial side surface of the cylinder connecting pin at the upper end of the cylinder, and has a cylinder connecting pin insertion hole or a notch in a portion where the cylinder connecting pin is inserted. A work machine according to any one of claims 1 to 4.

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