JP6079170B2 - Cab head guard device for construction machinery - Google Patents

Description

  The present invention relates to a cab head guard device for protecting a cab roof from a fallen object or the like in a construction machine such as a hydraulic excavator.

  In a conventional cab head guard device for a construction machine, a roof of a cab is provided with a skylight, and a headguard device for protecting the roof including the skylight from falling objects is known above the roof. This head guard device is composed of a front guard and a rear guard. The rear guard is fixed, whereas the front guard is openable so that it can be opened when cleaning the skylight. . Specifically, the front guard is formed in a lattice shape as a whole, and is pivotally attached to the cab by a hinge mechanism at the front end, and a mounting portion provided at the rear end is bolted to the front end of the rear guard. Thus, the closed state is maintained (see, for example, Patent Document 1).

JP 2008-163595 A

  In the configuration of Patent Document 1, mounting portions (three places) provided at the rear end of the front guard are placed on the front end portion of the rear guard and fixed with bolts. Since this attachment portion is a member protruding from the rear end of the front guard for the purpose of fixing the front guard to the rear guard, it is not so large in strength. Therefore, there is a demand for improving the strength in preparation for a case where a load such as a fallen object is applied to the front guard from above.

  On the other hand, in the cab head guard device shown in FIG. 11, mounting members 114 protrude from the left and right sides of the rear end of the front guard 113 that rotates with the front end as a fulcrum, and on the fixed rear guard 112 The locking member 115 is provided. By closing the attachment member 114 with the lock member 115 in the closed state of the front guard 113, the closed state is maintained. In this configuration, the front guard 113 is higher than the rear guard 112 and thus exceeds the transportation height, and the front guard 113 may have to be removed during transportation.

  In order to eliminate such inconvenience, a configuration in which the front guard 113 has the same height (planar shape) as the rear guard 112 is conceivable. In this case, the lock member 115 is provided on the cab 104. . If it does so, the big clearance gap for arrange | positioning the locking member 115 between front and back guard will generate | occur | produce, and it will be in a disadvantageous condition in strength.

  Therefore, in view of the above problems, the present invention provides a cab head guard device for a construction machine capable of suppressing the amount of displacement of the front and rear guards when a load such as a fallen object is applied to the front guard in a front and rear divided ceiling guard. The purpose is to provide.

In order to achieve the above object, the present invention provides a cab head guard device for a construction machine in which a ceiling guard for protecting the roof is provided on the roof of the cab provided with a skylight, and the rear of the ceiling guard. The side guard is fixed to the cab, and the front guard is configured to be attached to the cab so as to be openable and closable between a closed state that covers the roof upper surface and an open state that opens the roof upper surface. The frame constituting the rear guard front end portion is inserted into the lower side of the frame constituting the front guard rear end portion, and the rear guard includes a first member and a lower side of the first member. A first flat plate portion formed of a horizontal plane and a first front wall bent vertically downward from a front end of the first flat plate portion. The second member includes a second flat plate portion formed of a horizontal plane and a rear wall portion bent vertically upward from a rear end of the second flat plate portion, and the first member and the second member And a cab head guard device for a construction machine in which a closed cross-sectional structure is formed .

  Here, the frame constituting the front guard rear end portion and the rear guard front end portion are configured so that the top surfaces of the front guard and the rear guard are flat when the front guard is closed. A frame is preferably combined.

  Further, the front guard can be opened and closed between a closed state and an open state by rotating about the front end portion as a fulcrum, and a notch-shaped recess is formed in the frame constituting the rear guard front end portion, It is preferable that a holding function component for holding the front guard in a closed state is disposed in the recess.

Further, the frame that forms the rear end portion of the front guard has an engaging portion that protrudes downward in the left-right direction, and the frame that forms the front end portion of the rear guard protrudes upward. It is preferable that the joint portion extends in the left-right direction, and that both engaging portions are configured to be engageable in the closed state of the front guard.
Further, the rear guard further includes a third member which is a third member disposed between the first member and the second member and has higher rigidity than the first member, and the third guard The member includes a third flat plate portion formed of a horizontal plane and a second front wall portion bent vertically downward from a front end of the third flat plate portion, and an upper surface of the third flat plate portion is a lower surface of the first flat plate portion. It is preferable that the front surface of the second front wall portion is bonded to the rear surface of the first front wall portion.

  According to the cab head guard device for a construction machine according to claim 1, since the frame constituting the rear guard front end portion enters the lower side of the frame constituting the rear guard rear end portion, the fallen object It is advantageous in terms of the strength against such as. That is, according to such a configuration, when there is a fallen object in the front guard, the front guard is deformed, and the frame constituting the front guard rear end contacts the frame constituting the rear guard front end. At this time, the energy from the falling object is transmitted to the cab via the rear guard. Thereby, it becomes possible to suppress the displacement amount of the front guard and the rear guard.

  According to the cab head guard device for a construction machine according to claim 2, the top surfaces of the front guard and the rear guard are flat when the front guard is closed. For this reason, since the front guard has a stepped structure higher than the rear guard and exceeds the transport height, it is not necessary to remove the front guard, and the transportability is improved.

  According to the cab head guard device for a construction machine according to the third aspect, the closed-time holding functional component for holding the front guard in the closed state is disposed in the notch-shaped recess at the front end portion of the rear guard. According to this configuration, the top surface of the front guard and the rear guard contribute to a flat surface, and when the front guard has a fallen object, the load due to the fallen object is also absorbed from the closed holding functional parts. can do. Therefore, the load can be transmitted to the cab more quickly.

  According to the cab head guard device for a construction machine according to claim 4, the frame forming the rear end portion of the front guard has an engaging portion projecting downward extending in the left-right direction, and the front end of the rear guard. An engaging portion that protrudes upward is extended in the left-right direction on the frame that constitutes the portion, and both engaging portions can be engaged in the closed state. When there is a fallen object on the front guard, the rear end of the front guard is displaced forward, but the engagement part of the front guard rear end and the engagement part of the rear guard front end are engaged. Displacement is suppressed. Therefore, the load can be transmitted without loss from the front guard to the rear guard and further to the cab.

1 is a schematic side view showing an appearance of a hydraulic excavator equipped with a cab head guard device according to an embodiment of the present invention. The schematic perspective view which shows the cab of the hydraulic shovel which mounted | wore with the cab head guard apparatus by this embodiment. The perspective view which shows the cab head guard apparatus by this embodiment. The top view which shows the cab head guard apparatus by this embodiment. VV sectional view taken on the line of FIG. The enlarged view which expands and shows area | region R1 of FIG. VII-VII line sectional drawing of FIG. The enlarged view which expands and shows area | region R2 of FIG. It is the cab head guard apparatus by this embodiment, Comprising: The disassembled perspective view shown in the state which decomposed | disassembled the front side guard and the lock mechanism. The schematic side view which shows the cab head guard apparatus by a modification. The schematic side view which shows the cab head guard apparatus by another modification. The schematic side view which shows the cab head guard apparatus by another modification. The schematic side view which shows the cab head guard apparatus by a comparative example.

  A cab head guard device for a construction machine according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a hydraulic excavator will be described as an example of a construction machine.

  As shown in FIG. 1, the hydraulic excavator 1 includes a crawler-type lower traveling body 2A, an upper revolving body 2B mounted on the lower traveling body 2A so as to be rotatable about a vertical axis, and a front of the upper revolving body 2B. And the work attachment 3 attached to the part. The upper swing body 2B is provided with a cab (operator's cab) 4, and each operation of turning, running, and attachment operation is performed in the cab 4.

  Further, the roof 4A of the cab 4 is provided with a skylight 5 (FIG. 2) for securing an upper field of view at the front part, and the cab head guard device 11 for protecting the roof 4A including the skylight 5 from falling objects. Is mounted on the roof 4A. A front guard 6 (FIG. 1) for protecting the front window is attached to the front surface of the cab 4.

  The cab head guard device 11 will be described. As shown in FIGS. 3 and 4, the cab head guard device 11 includes a front guard 13 that covers and protects the front part of the roof 4A of the cab 4 from above, and a rear part that covers the rear part of the roof 4A and protects against falling objects. A rear guard 12 is provided.

  The front guard 13 is formed in a lattice shape as a whole, and is formed in a letter shape in a side view in which the front portion is inclined downwardly so as to follow the curved surface of the front portion of the roof 4A. As shown in FIG. 4, the front guard 13 has an outer frame formed by a front frame 13F, a rear frame 13B, a right frame 13R, and a left frame 13L, and vertical and horizontal bars that form a lattice are disposed inside the front frame. The vertical and horizontal bars are angled so as not to obstruct the view from the driver as much as possible.

  As shown in FIG. 3, the front end portion (front frame 13 </ b> F) of the front guard 13 is attached to the cab 4 via a support 14. Specifically, a long support 14 extending in the left-right direction is fixed to the front corner portions 4C of the left and right beams 4L, 4R of the cab 4 with bolts. The front frame 13F of the front guard 13 is pivotally attached to the support 14 by left and right hinge members 15. With this configuration, the front guard 13 rotates around the hinge member 15 as a fulcrum to cover the skylight 5 as shown in FIG. 1 and FIG. It can be opened and closed between the open posture (open state) at the time of cleaning which inclines back upward and opens the top of the skylight 5 as shown in FIG.

  Here, the structure of the rear frame 13B constituting the rear end portion of the front guard 13 will be described in detail. As shown in FIGS. 5 and 6, the rear frame 13B is inclined backward and backward in consideration of the operator's field of view, a flat plate portion 13A1 formed of a horizontal plane, a flange 13A2 bent vertically downward from the flat plate portion 13A1. And a front wall portion 13C joined to the front end of the flat plate portion 13A1. Accordingly, a recess 13d surrounded by the flat plate portion 13A1, the flange 13A2, and the front wall portion 13C is formed, and a flange 12C2 of the rear guard 12 described later can enter and engage with the recess 13d when the front guard 13 is closed. It becomes a state. The rear frame 13B has the cross-sectional structure as described above over the entire region in the left-right direction.

  Next, the rear guard 12 will be described. As will be described in detail later, the rear guard 12 has a substantially flat plate shape as a whole, and is fixed to the upper surface of the rear portion of the roof 4A with four bolts 21 (FIG. 4). The rear guard 12 is a fixed guard that is basically not removed even during cleaning or the like.

  As shown in FIGS. 5 and 6, the rear guard 12 includes a main member 12A, a first frame member 12B, and a second frame member 12C. The main member 12A includes a flat plate portion 12A1 formed of a horizontal plane, a front wall portion 12A2 bent vertically downward from the front end of the flat plate portion 12A1, and a rear wall portion bent so as to incline downward from the rear end of the flat plate portion 12A1. 12A3 (FIG. 5).

  The first frame member 12B has a flat plate portion 12B1 made of a horizontal plane and a front wall portion 12B2 bent vertically downward from the front end of the flat plate portion 12B1. The upper surface of the flat plate portion 12B1 is joined to the lower surface of the flat plate portion 12A1 of the main member 12A, and the front surface of the front wall portion 12B2 is joined to the rear surface of the front wall portion 12A2 of the main member 12A. The first frame member 12B is formed of a member that is thicker than the main member 12A, that is, a member having higher rigidity.

  The second frame member 12C includes a flat plate portion 12C1 formed of a horizontal plane, a flange 12C2 bent vertically upward from the front end of the flat plate portion 12C1, a rear wall portion 12C3 bent vertically upward from the rear end of the flat plate portion 12C1, It has a joint portion 12C4 that is bent rearward and vertically from the upper end of the rear wall portion 12C3. The flat plate portion 12C1 is joined to the lower end of the front wall portion 12A2 of the main member 12A. Further, the joint portion 12C4 is joined to the flat plate portion 12B1 of the first frame member 12B. Similarly to the first frame member 12B, the second frame member 12C is formed of a member having a thickness, that is, a rigidity higher than that of the main member 12A.

  With the configuration as described above, the flat plate portion 12A1 and the front wall portion 12A2 of the main member 12A, the first frame member 12B, and the second frame member 12C form a closed cross-section (b-shaped) structure, and further rigidity Is increasing. The rear guard 12 is constituted by the first frame member 12B, the second frame member 12C, the front wall portion 12A2 of the main member 12A, and the portion joined to the first frame member 12B in the flat plate portion 12A1 of the main member 12A. A front end frame 12F is formed.

  Further, the recess 12d is formed by the flat plate portion 12C1, the flange 12C2, and the front wall portion 12A2, and when the front guard 13 is closed, the flange 13A2 of the front guard 13 enters and can be engaged with the recess 12d.

  As shown in FIG. 9, the flange 12C2 of the second frame member 12C extends only in a region between the left and right recesses 12g described later in the left-right direction. That is, the flange 12C2 is not provided in the region outside the left and right recesses 12g where the striker 17 is provided, and the second frame member 12C includes the flat plate portion 12C1, the rear wall portion 12C3, and the joint portion 12C4. ing.

  The recess 12g will be described. Concave portions 12g are formed on the left and right sides of the front end portion (front frame 12F) of the rear guard 12 main body, and the striker 17 (holding functional component when closed) is arranged in each concave portion 12g as described above. As shown in FIG. 9, the recess 12g has a shape in which one side (front end side) of the rear guard 12 is cut out at two locations.

  More specifically, as shown in FIG. 8, the position of the front wall portion 12B2 ′ of the first frame member 12B in the recess 12g is retracted rearward from the front wall portion 12B2 (FIG. 6) in the region other than the recess 12g. It is in. The flat plate portion 12C1 'of the second frame member 12C in the recess 12g is cut at a position behind the flat plate portion 12C1 in the region other than the recess 12g. In the recess 12g, a striker attachment member 12E is attached to the second frame member 12C (rear wall portion 12C3), and the striker 17 is attached to the striker attachment member 12E by fasteners 12H (bolts and nuts). .

  As shown in FIGS. 4, 8 and 9, left and right locking mechanisms 16 are provided at positions below the rear frame 13B of the front guard 13 and corresponding to the left and right recesses 12g. When the lock mechanism 16 is engaged with the striker 17, the closed posture (closed state) of the front guard 13 is maintained.

  The lock mechanism 16 has, for example, the same principle configuration as a known lock mechanism that locks the engine hood of the vehicle to the vehicle body. As shown in FIG. 8, the lock mechanism 16 includes a rotary latch mechanism 18 provided on the rear frame 13 </ b> B of the front guard 13, and a lock release lever 19 for releasing the engagement between the striker 17 and the latch mechanism 18. Including a lock release mechanism. The unlock lever 19 is provided so as to protrude rearward from an opening (not shown) formed in the flange 13A2, and can be unlocked by operating in the direction of arrow A in FIG. . The unlocking mechanism excluding the latch mechanism 18 and the knob portion of the unlocking lever 19 is disposed in a recess 13d formed in the rear frame 13B.

  Further, regarding the relationship between the front guard 13 and the rear guard 12, as shown in FIGS. 5 to 8, when the front guard 13 is closed, the top surface (upper surface) of the flat plate portion 13A1 of the front guard 13 and the rear The top surface (upper surface) of the flat plate portion 12A1 of the side guard 12 is a flat surface having almost no step.

  3 and 4, the right frame 13R and the left frame 13L of the front guard 13 transmit this load to the cab 4 when the front guard 13 receives a load such as a fallen object from above. A load transmission member 20 is provided. Therefore, if there is a fallen object in the front guard 13, the load transmission member 20 receives the load and transmits it to the cab 4 together with the rear frame 13 </ b> B and the lock mechanism 16.

  As described above, in the cab head guard device 11 according to the present embodiment, the front end of the rear guard 12 below the frame (rear frame 13B) constituting the rear end of the front guard 13 in the closed state of the front guard 13. The frame (front frame 12F) is configured to enter, that is, the guards overlap each other. In other words, the front end of the rear guard 12 main body is configured to enter the lower side of the rear end of the front guard 13 main body. According to this configuration, when there is a fallen object on the front guard 13, the front guard 13 is deformed and the rear frame 13 </ b> B of the front guard 13 contacts the front frame 12 </ b> F of the rear guard 12. At this time, energy from the falling object is transmitted to the cab 4 via the rear guard 12. As a result, the displacement amount of the front guard 13 and the rear guard 12 can be suppressed. Therefore, it is advantageous in terms of strength against falling objects. It should be noted that the energy of the fallen object can be efficiently transmitted because the frames (or the main body) of the front guard 13 and the rear guard 12 having high rigidity come into contact with each other.

  Further, the rear frame 13B of the front guard 13 and the front frame 12F of the rear guard 12 are combined so that the top surfaces of the front guard 13 and the rear guard 12 are planar when the front guard 13 is closed. For this reason, since the front guard 13 has a stepped structure higher than the rear guard 12 and exceeds the transport height, it is not necessary to remove the front guard 13 and the transportability is improved.

  Further, a notch-shaped recess 12g is formed in the front frame 12F of the rear guard 12, and a closed-time holding functional component (striker 17) that holds the front guard 13 in a closed state is disposed in the recess 12g. According to this configuration, it contributes to making the top surfaces of the front guard 13 and the rear guard 12 flat, and when there is a fallen object on the front guard 13, the fallen holding functional component also causes a fallen object. Can absorb the load. Therefore, the load can be transmitted to the cab 4 more quickly.

  Further, in the closed state of the front guard 13, the flange 13A2 (downward engaging portion extending along the left-right direction) of the rear frame 13B of the front guard 13 and the flange 12C2 of the front frame 12F of the rear guard 12 (left-right) And an upwardly engaging portion extending along the direction). In other words, both the frames 13B and 12F have a hook-like structure. When there is a fallen object in the front guard 13, the rear end of the front guard 13 is displaced forward, but this displacement is suppressed because the flange 13A2 of the front guard 13 and the flange 12C2 of the rear guard 12 are engaged. Is done. Therefore, the load can be transmitted without loss from the front guard 13 to the rear guard 12 and further to the cab 4. The flanges 13A2 and 12C2 have not only the effect of transmitting a load but also the effect of increasing the rigidity of each frame.

<Modification>
The cab head guard device for a construction machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  In the embodiment described above, the hinge member 15 has a rear opening configuration provided at the front end portion of the front guard 13, but the configuration is not limited thereto. For example, there is a frame that constitutes the front end of the rear guard on the lower side of the frame that constitutes the rear end of the front guard in the closed state while the hinge member is provided on the left or right end of the front guard. You may comprise so that it may enter.

  In the embodiment described above, the hinge member 15 is used as the opening / closing mechanism of the front guard 13, but a slide mechanism may be used. In this case, for example, a guide rail can be provided on the left and right beams of the cab, and the movable guard can be slid back and forth along the guide rail to be openable.

  In the embodiment described above, the front guard 13 is provided with the lock mechanism 16 and the rear guard 12 is provided with the striker 17. On the contrary, the front guard is provided with the striker and the rear guard is provided with the striker 17. A lock mechanism may be provided.

  In addition, as a means for maintaining the closed posture of the front guard, other locking means or a fastener such as a bolt may be used instead of the lock mechanism 16 and the striker 17.

  In the embodiment described above, the rear frame 13B of the front guard 13 and the front frame 12F of the rear guard 12 so that the top surfaces of the front guard 13 and the rear guard 12 are planar when the front guard 13 is closed. Are combined, but the top surfaces of the front guard and the rear guard do not necessarily have to be flat.

  In the embodiment described above, the flange 13A2 of the front guard 13 and the flange 12C2 of the rear guard 12 are formed, but one or both of these flanges may not be formed.

  As an example of the above, FIGS. 10A to 10C schematically show a cab head guard device according to a modification.

  In the example illustrated in FIG. 10A, the rear frame 213B of the front guard 213 is positioned on the front frame 212F of the rear guard 212. That is, the front frame 212F is configured to enter the lower side of the rear frame 213B. According to such a configuration, when there is a fallen object in the front guard 213, the rear frame 213B comes into contact with the front frame 212F, and energy from the fallen object is transmitted to the cab via the rear guard 212.

  In the example shown in FIG. 10B, the upper half of the rear frame 313B of the front guard 313 is protruded rearward, and the lower half of the front frame 312F of the rear guard 312 is protruded forward of the front guard 313 and the rear guard 312. The rear frame 313 </ b> B and the front frame 312 </ b> F are combined so that the top surface thereof becomes a flat shape. According to such a configuration, in addition to the effect that the load is transmitted from the front guard 313 to the rear guard 312, there is an effect that the front guard 313 does not need to be removed during transportation and the transportability is high.

  In the example shown in FIG. 10C, an engaging portion that protrudes downward is provided on the rear frame 413B of the front guard 413, and an engaging portion that protrudes upward is provided on the front frame 412F of the rear guard 412. Is configured to be engageable. According to such a configuration, when there is a fallen object on the front guard 413, the engaging portions engage with each other, so that the forward displacement of the rear end portion of the front guard 413 is suppressed, and a load can be applied without loss. Can communicate.

  As described above, the cab head guard device for a construction machine according to the present invention is useful as a cab head guard device for protecting a cab and an operator of a construction machine such as a hydraulic excavator used for construction work from falling objects. It is.

1 hydraulic excavator, 2A lower traveling body, 2B upper turning body,
3 work attachment, 4 cab, 4A roof,
4C corner, 4L, 4R beam, 5 skylight, 6 front guard,
11 cab head guard device, 12 rear guard, 12A main member,
12A1 flat plate part, 12A2 front wall part, 12A3 rear wall part,
12B 1st frame member, 12B1 flat plate part, 12B2 front wall part,
12C 2nd frame member, 12C1 flat plate part, 12C2 flange,
12C3 rear wall, 12C4 joint, 12E striker mounting member,
12F front frame, 12H fastener, 12d, 12g recess,
13 Front guard, 13A1 flat plate part, 13A2 flange,
13B rear frame, 13C front wall, 13d recess,
13F front frame, 13L left frame, 13R right frame,
14 support, 15 hinge member, 16 lock mechanism,
17 striker, 18 latch mechanism, 19 unlocking lever,
20 load transmitting member, 21 bolts.

Claims (5)

In a cab head guard device for a construction machine, in which a ceiling guard for protecting the roof is provided on the roof of the cab with a skylight, divided into front and rear,
The rear guard of the ceiling guard is fixed to the cab, and the front guard is configured to be attached to the cab so as to be openable and closable between a closed state covering the roof upper surface and an open state opening the roof upper surface,
In the closed state of the front guard, the frame constituting the rear guard front end is inserted into the lower side of the frame constituting the front guard rear end ,
The rear guard includes a first member and a second member disposed below the first member,
The first member includes a first flat plate portion formed of a horizontal plane and a first front wall portion bent vertically downward from a front end of the first flat plate portion,
The second member includes a second flat plate portion made of a horizontal plane and a rear wall portion bent vertically upward from a rear end of the second flat plate portion,
A cab head guard device for a construction machine, wherein the first member and the second member form a closed cross-sectional structure .   A frame constituting the front guard rear end portion and a frame constituting the rear guard front end portion so that the top surfaces of the front guard and the rear guard are flat when the front guard is closed. The cab head guard device for a construction machine according to claim 1, wherein the cab head guard device is combined. The front guard can be opened and closed between a closed state and an open state by turning the front end portion as a fulcrum,
A notch-shaped recess is formed in the frame constituting the rear guard front end,
The cab head guard device for a construction machine according to claim 2, wherein a holding function component for holding the front guard in a closed state is disposed in the recess.   An engagement portion that protrudes downward extends in the left-right direction on the frame that forms the rear end portion of the front guard, and an engagement portion that protrudes upward on the frame that forms the front end portion of the rear guard. 4 is extended along the left-right direction, and it is comprised so that both engagement parts can be engaged in the closed state of the said front side guard, The any one of Claim 1 to 3 characterized by the above-mentioned. Cab head guard device for construction machinery.   The rear guard further includes a third member which is a third member disposed between the first member and the second member and has higher rigidity than the first member,
  The third member includes a third flat plate portion formed of a horizontal plane and a second front wall portion bent vertically downward from a front end of the third flat plate portion,
  The upper surface of the third flat plate portion is bonded to the lower surface of the first flat plate portion, and the front surface of the second front wall portion is bonded to the rear surface of the first front wall portion. The cab head guard device for a construction machine according to any one of 4.

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