JP5518596B2 - Cab guard for work equipment - Google Patents

Description

  The present invention relates to a cab guard attached to the front surface of a cab front window and the top surface of a skylight of a working machine such as a dismantling machine or a scrap processing machine.

  In the demolition machine, in order to protect the cab and the operator from falling objects such as a concrete block falling toward the cab during work, a cab guard is provided on the front surface of the front window of the cab and the upper surface of the skylight. In a cab equipped with such a cab guard, if the front window or skylight becomes dirty, it becomes difficult for the operator in the cab to visually recognize the object to be visually observed, so it is necessary to clean it. Here, if a structure is provided in which a gap is provided between the skylight and the head guard above it, and the skylight is cleaned by inserting a hand through the gap, the gap needs to be wide enough to insert a hand. As a result, the height of the head guard may increase and exceed the restricted transport height.

  Therefore, in order to reduce the height of the head guard, it is preferable that the head guard can be opened and closed, and the head guard is opened for cleaning as described in Patent Document 1. That is, if the head guard can be opened and closed, the gap between the head guard and the skylight can be narrowed in a normal working state or transportation state with the head guard closed. The head guard described in Patent Document 1 is configured integrally with a horizontal guard that covers the top of the skylight and an oblique guard that covers the corner between the skylight and the front window, and the front end of this integrated headguard. The head guard can be opened and closed around the hinge provided on the head.

JP 2008-163595 A

  However, as described in Patent Document 1, if the head guard is configured to open and close by integrating the horizontal guard at the top of the skylight and the diagonal guard that covers the corner portion, the weight of the head guard increases, and the head accompanying cleaning There is a problem that a large amount of labor is required for opening and closing the guard, and that it is necessary to increase the scale of the urging means such as a gas cylinder for assisting the push-up force when the head guard is opened.

  Further, in a working machine such as a demolition machine, it is necessary to increase the strength of the guard in order to protect the skylight and the operator from falling objects such as a concrete block falling from a high place during work. In order to increase the strength of the guard, it is necessary to increase the thickness and width of the guard component, and as a result, the weight of the guard increases. However, in the configuration described in Patent Document 1, there is a problem that it is difficult to increase the weight further because of the labor required for the opening / closing operation, and it is difficult to increase the strength.

  In view of the above problems, the present invention makes it possible to meet the demand for improvement in the strength of the guard, and facilitate the opening / closing operation of the head guard during cleaning and downsizing the urging means for assisting the opening force. An object of the present invention is to provide a cab guard for a work machine that enables the above.

The cab guard of the work machine according to claim 1 is:
Front window guard attached to the front of the front window of the cab,
A skylight guard having a frame composed of left and right side frames and a front frame and a rear frame, and attached to the cab skylight so as to be opened and closed,
Has a rectangular frame consisting of vertical frame and the upper frame and lower frame of the left and right, the front lower end is fixed to the upper end of the window guard mounted obliquely fixed to a mounting seat having a top end to the cab, the upper and a corner guards for covering the corner portion between the skylight and the front window frame is to face in close proximity to the front frame of the skylight guard,
It is characterized in that the front frame of the skylight guard comes into contact with the upper frame of the corner guard by bending of the skylight guard .

The cab guard for a work machine according to claim 2 is the cab guard for a work machine according to claim 1,
The mounting seat for the skylight guard provided on the upper surface of the cab is also used as a mounting seat for fixing the upper end of the corner guard.

The cab guard of the work machine according to claim 3 is the cab guard of the work machine according to claim 1 or 2,
The plate surface of the upper frame of the corner guard and the plate surface of the front frame of the skylight guard are set parallel to the direction of the line of sight of the operator in the cab.

The cab guard for a work machine according to claim 4 is the cab guard for a work machine according to any one of claims 1 to 3,
A plurality of lights are mounted side by side in the longitudinal direction of the vertical frame on the vertical frame on the opposite side of the work front in the corner guard.

The cab guard for a work machine according to claim 5 is the cab guard for a work machine according to any one of claims 1 to 4,
The light is mounted on the corner guard so that the inclination angle can be adjusted, and the uppermost portion of the light is set to be equal to or lower than the upper surface of the skylight guard in a posture where the uppermost portion of the light is lowest.

According to the first aspect of the present invention, the head guard that covers the upper surface of the cab is separated into the corner guard that covers the corner portion and the skylight guard that can be opened and closed separately from the corner guard. The skylight guard can be configured to be lightweight. For this reason, when cleaning a skylight, it becomes possible to open and close a skylight guard easily. Further, since the weight of the skylight guard to be opened and closed is lighter than that of the conventional head guard, the scale of the urging means for assisting the push-up force when the skylight guard is opened can be reduced. Moreover, since the skylight guard can be opened and closed even when the weight of the skylight guard is about the same as that of the conventional head guard, it is possible to configure a skylight guard with increased strength.
When the skylight guard is fixed to the top plate, the front frame of the skylight guard faces the corner guard's upper frame in close proximity, and when the concrete block or the like falls on the skylight guard and the skylight guard bends, The frame abuts against the upper frame of the corner guard, whereby the skylight guard is supported by the corner guard, and further deformation of the skylight guard is prevented. On the other hand, when a concrete block or the like falls on the corner guard, the upper frame of the corner guard comes into contact with the front frame of the skylight guard and receives a load on the skylight guard. With such a structure, the strength of the entire guard can be improved.

  According to the invention of claim 2, since the mounting seat for the skylight guard provided on the upper surface of the cab is also used as the mounting seat for the corner guard, there is no need to provide a mounting seat dedicated to the corner guard, and the number of mounting seats can be reduced. It is possible to reduce the number of operators and to improve the visibility of the operator.

  According to the invention of claim 3, since the plate surface of the upper frame of the corner guard and the plate surface of the front frame of the skylight guard are set in parallel with the direction of the line of sight of the operator in the cab, these members are the visual field of the operator. Can be kept to a minimum.

  According to the invention of claim 4, since the plurality of lights are arranged side by side in the longitudinal direction of the vertical frame on the vertical frame on the opposite side of the work front of the corner guard, the lights are arranged on the work front side, that is, the work target side. The visual field in the direction of the work object is improved without blocking the visual field.

  According to the invention of claim 5, since the light is mounted on the corner guard so that the posture can be changed, and in the posture where the light uppermost portion is lowest, the uppermost portion is lower than the upper surface of the skylight guard. It is possible to suppress the height of the cab including the height below the restricted transport height.

It is a side view which shows an example of the working machine to which this invention is applied. It is a side view which shows one Embodiment of the cab guard of this invention. It is a front view of the cab guard of this embodiment. It is a top view of the cab guard of this embodiment. It is a side view which shows the attachment structure of the cab guard of this embodiment. It is a partial enlarged front view of the cab guard of this embodiment. It is a perspective view of the cab guard of this embodiment.

  FIG. 1 is a side view showing an example of a working machine to which the present invention is applied. This example shows a case where the work machine is a dismantling machine. In FIG. 1, 1 is a lower traveling body, and 2 is an upper revolving body installed on the lower traveling body 1 via a revolving device 3. The upper swing body 2 is configured by mounting a hydraulic power unit 4, a cab 5, a counterweight 6 and the like on a swing frame 2a.

  Reference numeral 7 denotes a long front that constitutes a work front. The long front 7 includes a long base end boom 9 that is attached to the revolving frame 2a by a hydraulic cylinder 8 so as to be able to be lifted and lowered. A relay boom 11 attached to the tip of the relay boom 11 by a hydraulic cylinder 10, an arm 13 attached to the tip of the relay boom 11 by a hydraulic cylinder 12, and a hydraulic cylinder 14 at the tip of the arm 13. The crushing device 17 is rotatably attached via the links 15 and 16. The crushing device 17 has a configuration in which crushing claws 19 and 19 forming a pair are opened and closed by corresponding hydraulic cylinders 18 and 18, respectively.

  As shown in FIG. 1, a cab guard 21 is attached to the cab 5. As shown in the side view of FIG. 2, the front view of FIG. 3, and the plan view of FIG. 4, the cab guard 21 includes upper and lower front window guards 23, 24 attached to the front surface of the front window 22 of the cab 5, The skylight guard 26 mounted on the skylight 25 of the top plate portion 5b of the cab 5, and the front window guard 23 and the skylight guard 26 are obliquely mounted between the front window 22 and the skylight 25. It consists of a corner guard 27 that covers it.

  The upper front window guard 23 forms a rectangular frame with left and right vertical frames 32, 32 and a lower frame 33 made of a mold material and an upper frame 34 made of a flat plate, and a plurality of vertical plates made of a flat plate are formed in the frame. The plate 35 and one horizontal plate 36 are combined and welded. The lower front window guard 24 is formed by assembling a rectangular frame with left and right vertical frames 38, 38, an upper frame 39, and a lower frame 40 made of a mold material, and welding a plurality of vertical plates 41 into the frame. .

  As shown in the side view of FIG. 5, in order to attach the front window guard 23 to the cab 5, mounting seats 43 are welded to the left and right frames 5 a on the front surface of the cab 5, and provided on the left and right vertical frames 32 of the front window guard 23. The bracket 44 is fixed to the mounting seat 43 with bolts 45 and nuts 46. The lower front window guard 24 is similarly installed.

  As shown in FIGS. 3 and 4, the corner guard 27 is composed of left and right vertical frames 48 and 48 made of a mold material, an upper frame 49 made of a flat plate, and a lower frame 50 that form a rectangular frame. A plurality of vertical plates 51 are welded together. As shown in the side view of FIG. 5 and the front view of FIG. 6, the lower end of the corner guard 27 is attached with the lower frame 50 overlapped with the upper frame 34 of the front window guard 23 and fixed with bolts 53 and nuts 54. As shown in the perspective view of FIG. 7, mounting seats 55 and 56 for mounting the skylight guard 26 are provided on the side frames 5 c provided on the left and right of the top plate portion 5 b of the cab 5. As shown in FIG. 5, the upper end of the corner guard 27 is attached by fixing a bracket 57 provided on the left and right vertical frames 48 to a mounting seat 55 for attaching the skylight guard with bolts 58 and nuts 59.

  A gap is formed between the front window guards 23 and 24 and the corner guard 27 and the front window 22 so that a hand can be inserted from the lateral direction during cleaning. Due to the presence of this gap, it is not necessary to open and close these guards 23, 24 and 27 when cleaning the front window 22.

  As shown in FIG. 4, the skylight guard 26 assembles a rectangular frame with left and right side frames 60 and 60 and a rear frame 61 made of a mold material, and a front frame 62 made of a flat plate, A portion facing the rear portion from above the skylight 25 is closed by a flat plate 63, and a plurality of vertical plates 64 made of a flat plate are welded between the closed portion and the front frame 62. The skylight guard 26 is attached so as to be openable and closable around a pivoting portion 66 on the top plate portion 5 b of the cab 5. The pivoting portion 66 is provided on the front 7 side of the cab 5, that is, on the opposite side of the door 5e side (see FIG. 1) of the cab 5 where the step 5d is provided.

  As shown in the perspective view of FIG. 7, a gas cylinder 68 is attached between the top plate 5 b and the skylight guard 26 to apply a force in the push-up direction to the skylight guard 26 to facilitate opening and closing. This gas cylinder 68 is one in which a compressed gas is sealed in a sealed space. The mounting seats 55 and 56 provided on the opposite side of the pivoting portion 66 have screw holes 55a and 56a, while the side frame 60 on the opposite side of the pivoting portion 66 of the skylight guard 26 is fixed to the mounting seats 55 and 56. Brackets 70 and 71 are attached. As shown in FIGS. 2 and 5, when the skylight guard 26 is closed, the brackets 70 and 71 are placed on the mounting seats 55 and 56, and the bolts 72 and 73 are passed through the brackets 70 and 71 into the screw holes 55a and 56a. The skylight guard 26 is fixed to the side frame 5c by screwing.

  In this state where the skylight guard 26 is fixed to the top plate 5b, as shown in FIG. 5, the front frame 62 of the skylight guard 26 faces the upper frame 49 of the corner guard 27 so as to face the skylight guard 26. When the concrete block or the like falls and the skylight guard 26 bends, the front frame 62 comes into contact with the upper frame 49 of the corner guard 27, whereby the skylight guard 26 is supported by the corner guard 27 and the skylight guard 26 is further deformed. Is prevented. On the other hand, when a concrete block or the like falls on the corner guard 27, the upper frame 49 of the corner guard 27 abuts on the front frame 62 of the skylight guard 26, and the skylight guard 26 receives a load. As such a structure, the strength of the entire guard is improved.

  As shown in FIG. 5, the plate surface of the upper frame 49 of the corner guard 27 and the plate surface of the front frame 62 of the skylight guard 26 are both parallel to the direction of the line of sight 69 of the operator 67 in the cab 5, that is, the eye point. It is set to be radial from 67a. By setting the orientation of the plate surface of each member in this way, it is possible to minimize the fact that these members hinder the visual field of the operator.

  2, 5, and 7, reference numeral 75 denotes a support rod that supports the opposite side of the pivoting portion 66 of the skylight guard 26 when the skylight guard 26 is opened. The support rod 75 rotatably supports the root portion 75a on the side surface 60 of the side frame 60 of the skylight guard 26, and the support rod 75 is shown in FIGS. 2 and 5 when the skylight guard 26 is closed. Is attached to the side frame 60, and is fixed to the side frame 60 by a stopper 76. As shown in FIG. 5, the stopper 76 is configured such that the stopper body 76 a is attached to be able to be opened and closed by a hinge 76 b, and the support rod 75 is sandwiched between the stopper body 76 a and the side frame 60. The support rod 75 is held on the side frame 60 by fixing the stopper body 76a to the side frame 60 with the bolts 76c.

  On the other hand, in order to clean the skylight 25, when the skylight guard 26 is opened as shown in FIG. 7, the bolt 76c is loosened to open the stopper body 76a, thereby releasing the restraint of the support rod 75 and the support rod 75. Is rotated around the root portion 75a, and the free end of the support rod 75 is engaged with a locking tool 77 attached to the side frame 5c provided on the top plate portion 5b to prevent the skylight guard 26 from descending.

  2, 4, and 7, reference numeral 80 denotes a rear guard that covers the rear portion of the top plate portion 5 b of the cab 5 from the portion covered with the skylight guard 26. The rear guard 80 is configured by stretching a plate material 82 in a frame 81 assembled in a rectangular shape with a mold material. The rear guard 80 is fixedly attached to the top plate portion 5b.

  2 to 6, reference numeral 84 denotes a light that illuminates the work site. The light 84 is attached to the corner guard 27 on the vertical frame 48 opposite to the front 7 via a U-shaped bracket 85. A plurality of lights 84 (two in the illustrated example) are attached along the longitudinal direction of the vertical frame 48. As shown in FIG. 6, these lights 84 are fixed to the bracket 85 by screwing and fastening the bolts 86 to the screw holes 84 a provided in the frame of the lights 84 through the holes provided in the bracket 85. By loosening, the posture can be changed by rotating around the bolt 86.

  As shown in FIG. 5, these lights 84 are set so that the posture of the lights 84 is the lowest during transportation, and the uppermost portion of the lights 84 is lower than the upper surface of the skylight guard 26. That is, in the example of FIG. 5, the uppermost portion of the light 84 is lowered by ΔH and the uppermost portion is in the lowest posture when the light 84 is in the upward posture indicated by the two-dot chain line, compared to the forward direction indicated by the solid line. Thus, by lowering the posture of the light 84, the upper surface of the light 84 is configured to be equal to or lower than the upper surface of the skylight guard 26.

  As described above, in this embodiment, the head guard that covers the upper surface of the cab 5 can be opened and closed separately from the corner guard 27 that covers the corner portion of the front window 22 and the skylight 25 and the corner guard. Since the skylight guard 26 is separated from the skylight guard 26, the skylight guard 26 that can be opened and closed can be configured to be lightweight. For this reason, when cleaning the skylight 25, it becomes possible to open and close the skylight guard 26 easily. Further, since the weight of the skylight guard 26 that is opened and closed is lighter than that of the conventional head guard, it is possible to reduce the scale of the urging means such as the gas cylinder 68 that assists the pushing force when the skylight guard 26 is opened. Become. In addition, since the skylight guard 26 can be opened and closed even if the weight of the skylight guard 26 is equivalent to that of the conventional head guard, the skylight guard 26 with increased strength can be configured.

  Further, in this embodiment, the plate surface of the upper frame 49 of the corner guard 27 and the plate surface of the front frame 62 of the skylight guard 26 are both set to be parallel to the direction of the line of sight of the operator in the cab 5. Therefore, it can be minimized that these members obstruct the operator's view.

  In this embodiment, the lower end of the corner guard 27 is attached to the front window guard 23, and the mounting seat 55 of the skylight guard 26 provided on the upper surface of the cab 5 is also used for attaching the corner guard 27. There is no need to provide a mounting seat dedicated to the guard 27, the number of mounting seats can be reduced, and the operator's field of view can be improved.

  In this embodiment, since the plurality of lights 84 are mounted side by side in the longitudinal direction of the vertical frame 48 on the opposite side of the front 7 of the corner guard 27, the lights 84 are viewed on the front 7 side, that is, on the work target side. The field of view in the work target direction is good.

  Further, in this embodiment, the light 84 is mounted on the corner guard 27 so that the posture can be changed, and the uppermost portion of the light 84 is lower than the upper surface of the skylight guard 26 in the posture where the uppermost portion of the light 84 is lowest. Therefore, it becomes possible to keep the height of the cab including the guard below the restricted transport height.

  Further, in this embodiment, since the pivoting portion 66 of the skylight guard 26 is provided on the opposite side of the front 7, the skylight guard 26 is mounted in a state where an operator is on the step 5 d for moving up and down to the cab 5. Can be opened and closed.

  Although the present invention has been described above by the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and additions can be made without departing from the gist of the present invention. For example, the front window guards 23 and 24 and the corner guard 27 may be configured to be openable and closable. Moreover, as a biasing means for applying a force in the opening direction to the skylight guard 26, a structure using a spring other than the gas cylinder can be used. The present invention can also be applied to other working machines such as a scrap processing machine and an excavator that require a skylight guard.

1: Lower traveling body, 2: Upper turning body, 2a: Turning frame, 3: Turning device, 4: Hydraulic power unit, 5: Cab, 6: Counterweight, 7: Work front, 21: Cab guard, 22: Front Windows, 23, 24: Front window guard, 25: Skylight, 26: Skylight guard, 27: Corner guard, 32: Vertical frame, 33: Lower frame, 34: Upper frame, 35: Vertical plate, 36: Horizontal plate, 38 : Vertical frame, 39: upper frame, 40: lower frame, 41: vertical plate, 43: mounting seat, 44: bracket, 45: bolt, 46: nut, 48: vertical frame, 49: upper frame, 50: lower frame 51: vertical plate, 53: bolt, 54: nut, 55, 56: mounting seat, 57: bracket, 58: bolt, 59: nut, 60: side frame, 61: rear frame, 62: front frame, 63: Flat plate, 64: vertical plate, 66: pivoting portion, 68: gas cylinder, 70, 1: Bracket, 72, 73: Bolt, 75: support rod, 76: stopper, 77: fastener, 80: rear guard, 84: light, 85: U-shaped bracket, 86: bolt

Claims (5)

Front window guard attached to the front of the front window of the cab,
A skylight guard having a frame composed of left and right side frames and a front frame and a rear frame, and attached to the cab skylight so as to be opened and closed,
Has a rectangular frame consisting of vertical frame and the upper frame and lower frame of the left and right, the front lower end is fixed to the upper end of the window guard mounted obliquely fixed to a mounting seat having a top end to the cab, the upper and a corner guards for covering the corner portion between the skylight and the front window frame is to face in close proximity to the front frame of the skylight guard,
A cab guard for a working machine, wherein the front frame of the skylight guard is in contact with the upper frame of the corner guard by bending of the skylight guard. In the cab guard of the working machine according to claim 1,
A cab guard for a working machine, wherein a mounting seat for the skylight guard provided on an upper surface of the cab is also used as a mounting seat for fixing an upper end of the corner guard. In the cab guard of the working machine according to claim 1 or 2,
A cab guard for a working machine, wherein a plate surface of an upper frame of the corner guard and a plate surface of a front frame of the skylight guard are set in parallel to the direction of the line of sight of an operator in the cab. In the cab guard of the working machine of any one of Claim 1 to 3,
A cab guard for a working machine, wherein a plurality of lights are mounted side by side in the longitudinal direction of the vertical frame on a vertical frame on the opposite side of the work front in the corner guard. In the cab guard of the working machine according to any one of claims 1 to 4,
A cab guard for a work machine, wherein the light is mounted on the corner guard so that the posture can be changed, and the uppermost portion is set to be below the upper surface of the skylight guard in a posture where the uppermost portion of the light is lowest. .

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