JP6237735B2 - Construction machine front guard structure - Google Patents

Description

  The present invention relates to a front guard structure for a construction machine.

  Conventionally, a work machine in which a front guard is disposed on a front surface of a driver's seat is known (see, for example, Patent Document 1).

  In Patent Literature 1, when attaching the front guard, after attaching the upper side of the mounting frame body to the ceiling, the sub-assembly body in which the net body is assembled to the remaining mounting frame body is fixed to the upper side. Such a configuration is disclosed.

  By the way, when working at a work site with a downward slope, the vehicle body is in a forward tilt posture. Here, when a handrail or the like is disposed in front of the driver's seat, the worker can maintain his / her posture by placing his / her foot on the handrail and struggling.

  However, in the invention of Patent Document 1, since a handrail is not provided in front of the driver's seat in order to attach the front guard, an operator steps on his or her foot at a work site with a downward slope. There is a problem that can not be. Note that it is not preferable to place the foot on the mesh body of the front guard and step on it, because the mesh body may be deformed.

  On the other hand, Patent Document 2 has a configuration in which an operation lever that can be rotated in the front-rear direction in a state of being seated in the cab is provided, and a foot pedal can be folded in the middle of the lever portion of the operation lever. It is disclosed. This makes it possible for the worker to work in an easy posture without having to keep an unreasonable posture such as forcing the worker to lean forward by placing the foot on the foot pedal. Yes.

JP 2007-154477 A Japanese Utility Model Publication No.59-121068

  However, in the invention of Patent Document 2, since the operation lever is provided with a foot pedal, there is a risk of erroneous operation of the operation lever if the foot is placed on the foot pedal when the vehicle body is tilted forward. There is a problem that there is.

  This invention is made | formed in view of this point, The objective is to enable an operator to maintain a posture even when a vehicle will be in a forward leaning attitude | position.

  The present invention is directed to a front guard structure for a construction machine in which an upper swing body is rotatably mounted on a lower traveling body, and the front of the vehicle in the operation space of the upper swing body is covered with a front guard. A solution was taken.

That is, in the first invention, the front guard is provided in the frame of the guard frame, a horizontal beam portion that is provided integrally with the guard frame and crosses the frame of the guard frame in the vehicle width direction, and the frame of the guard frame. A guard member,
The horizontal beam portion is provided with a footrest member having a tread surface protruding toward the driving space at a position away from the floor surface of the driving space.

In the first aspect of the invention, the guide frame of the front guard is provided with a cross beam so as to cross the inside of the frame in the vehicle width direction. A footrest member having a tread surface is provided at a position away from the floor surface of the operation space on the operation space side of the horizontal beam portion. Thus, even when the vehicle is in a forward leaning posture at a work site that is inclined downward, the posture can be maintained by the operator placing his / her foot on the footrest member and stroking it.

According to a second invention, in the first invention,
The tread surface is inclined obliquely downward from the front guard toward the driving space.

  In the second invention, the tread surface of the footrest member is inclined obliquely downward from the front guard toward the driving space. As a result, the tread surface is in a substantially horizontal state at a work site that is inclined downward, so that the operator can easily step on and step on.

According to a third invention, in the first or second invention,
A column that is installed in front of the vehicle in the driving space and is provided with a mounting seat for attaching the front guard;
A fastening member for fastening the front guard to the mounting seat;
A through hole into which the fastening member can be inserted is formed at the connection position with the end of the cross beam portion in the guard frame,
The mounting seat is provided at a position corresponding to the through hole,
The said front guard is attached to the said support | pillar by inserting the said fastening member in the said through-hole, and making it fasten to the said mounting seat.

  In 3rd invention, the connection position with the edge part of the cross beam part in a guard frame is fastened to the attachment seat by the fastening member. As a result, the load applied to the lateral beam portion when the foot is placed on the footrest member is also distributed to the column side via the mounting seat, so that deformation of the lateral beam portion can be suppressed.

According to a fourth invention, in any one of the first to third inventions,
An operation pedal disposed in front of the vehicle on the floor surface of the driving space;
The footrest member is disposed above the operation pedal.

  In the fourth aspect of the invention, since the footrest member is disposed above the operation pedal, the footrest member does not get in the way when operating the operation pedal in normal flat work.

A fifth invention is a front guard structure for a construction machine in which an upper swing body is turnably mounted on a lower traveling body, and a vehicle front of an operation space of the upper swing body is covered with a front guard,
The front guard includes a guard frame, a transverse beam portion that is provided integrally with the guard frame and crosses the inside of the guard frame in the vehicle width direction, and a guard member provided within the frame of the guard frame. ,
The transverse beam portion is provided with a footrest member having a tread surface protruding to the driving space side,
The footrest member connects the pair of side wall plates that are erected at an interval in the vehicle width direction and the pair of side wall plates in a posture inclined obliquely downward from the front guard toward the driving space. A tread board,
The upper edge portion of the tread plate is disposed above the upper edge portion of the horizontal beam portion and at a position spaced from the horizontal beam portion toward the operation space.

  In the fifth invention, the upper edge portion of the tread plate of the footrest member is disposed at a position above the upper edge portion of the lateral beam portion and spaced from the lateral beam portion toward the operating space. Thereby, when an operator visually recognizes the footrest member, the front of the vehicle can be confirmed from the gap between the upper edge portion of the tread plate and the cross beam portion.

According to a sixth invention, in any one of the first to fourth inventions,
The footrest member connects the pair of side wall plates that are erected at an interval in the vehicle width direction, and the pair of side wall plates in a posture inclined obliquely downward from the driving space toward the front guard. It has a plurality of slit plates.

  In the sixth invention, the slit plate of the footrest member is inclined obliquely downward from the driving space toward the front guard. Thereby, when an operator visually recognizes the footrest member, the vehicle front can be confirmed from the gaps between the plurality of slit plates.

  According to the present invention, even when the vehicle is in a forward leaning posture at a work site that is inclined downward, the posture can be maintained by the operator placing his / her foot on the footrest member and standing on it.

It is a side view which shows the structure of the construction machine which concerns on this Embodiment 1. FIG. It is a perspective view which shows the structure of the upper turning body of the state which removed the front guard. It is a perspective view which shows the structure of the upper turning body of the state which attached the front guard. It is a front view which shows a front guard structure. It is a rear view which shows a front guard structure. It is a rear view which shows the structure of a lower front guard. It is side surface sectional drawing which shows the structure of a footrest member. It is a perspective view which shows the structure of the footrest member which concerns on this Embodiment 2. FIG. It is side surface sectional drawing which shows the structure of a footrest member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / rear / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

Embodiment 1
As shown in FIG. 1, the construction machine 10 includes a crawler-type lower traveling body 11 and an upper revolving body 12 that is rotatably mounted on the lower traveling body 11. The construction machine 10 of the present embodiment is a small turning type, and the upper turning body 12 is configured to be relatively small so that the turning radius is small, and the outline of the rear part of the upper turning body 12 is a plan view. It is formed in an arc shape.

  An attachment 13 is installed on the front side of the upper swing body 12. The attachment 13 includes a boom 14, an arm 15, a bucket 16, and the like. Each of the booms 14 and the like operate in conjunction with the expansion and contraction of the hydraulic cylinder 17 that is hydraulically controlled, and perform operations such as excavation.

  The boom 14 includes a rear boom 14a, a front boom 14b, and an upper boom 14c. The front boom 14b rotates in the left-right direction by expanding and contracting an offset cylinder (not shown). Thereby, the upper boom 14c moves to the position offset in the left-right direction with respect to the rear boom 14a.

  As shown in FIG. 2, the upper swing body 12 is provided with an operation space S for arranging the operation seat 21, the operation lever 22, and the like. A machine room for housing hydraulic equipment and tanks (not shown) is provided on the right side of the operation seat 21 and is covered with a machine room cover 25. Further, an engine room for storing an engine (not shown) is provided behind the operation seat 21 and is covered with an engine cover 26. The front left side of the driving space S is opened as an entrance for getting on and off the operator seat 21.

  Operation levers 22 are provided on the left and right sides of the driving seat 21. By operating the operation lever 22, the hydraulic cylinder 17 can be expanded and contracted to drive the attachment 13.

  A traveling lever 23 extending upward from the floor surface F of the upper swing body 12 is provided in front of the operation seat 21. By operating the traveling lever 23, the lower traveling body 11 can be moved forward or backward.

  An offset pedal 24 is provided at the front of the operation seat 21. Here, when the operator steps on the offset pedal 24 so as to tilt left and right, an offset cylinder (not shown) expands and contracts and the front boom 14b rotates in the left-right direction. Thereby, the bucket 16 can be moved to the position offset in the left-right direction.

  A pair of left and right front columns 31 extending upward from the floor surface F of the driving space S are provided in front of the driving seat 21. A pair of left and right rear columns 35 extending upward from the upper surface of the engine cover 26 are provided behind the operation seat 21.

  The upper end portion of the right front column 31 and the upper end portion of the right rear column 35 are connected by a roof beam 36. The roof beam 36 projects to the left so as to surround the upper portion of the operation space S. A roof panel 37 that covers the upper portion of the operation space S is attached to the roof beam 36.

  The left front column 31 supports the left front portion of the roof beam 36. The left rear column 35 supports the left rear portion of the roof beam 36.

  The front support column 31 is provided with a plurality of mounting seats 33 at intervals in the vertical direction. The attachment seat 33 is for attaching a front guard 40 described later, and is formed with a screw hole for fastening the fastening bolt 55.

  Hereinafter, the front guard structure which covers the front side of the driving space S will be described. As shown in FIGS. 3 to 5, a front guard 40 is disposed in front of the driving seat 21 in front of the movable range of the travel lever 23.

  The front guard 40 is divided into an upper front guard 41 that covers the upper position of the driving space S and a lower front guard 45 that is disposed below the upper front guard 41 and covers the lower position of the driving space S. .

  The upper front guard 41 includes an upper guard frame 42 and an upper net 43 that is stretched within the upper guard frame 42. The upper net 43 is formed of, for example, a metal net, and the operator can visually recognize the front through the mesh of the upper net 43. The outer peripheral edge of the upper net 43 is joined to the inner peripheral edge of the upper guard frame 42.

  A through hole 42 a is formed in the upper guard frame 42 corresponding to the screw hole of the mounting seat 33. Specifically, three through holes 42a are formed at the left edge of the upper guard frame 42 with a space in the vertical direction. Three through holes 42 a are formed in the right edge portion of the upper guard frame 42 at intervals in the vertical direction.

  The upper front guard 41 is attached to the front column 31 by inserting the fastening bolt 55 into the through hole 42 a and screwing it to the attachment seat 33.

  The lower front guard 45 includes a lower guard frame 46 and a lower mesh body 47 (guard member) stretched within the frame of the lower guard frame 46. The lower mesh body 47 is formed of, for example, a wire mesh, and the operator can visually recognize the front through the mesh of the lower mesh body 47. The outer peripheral edge of the lower net 47 is joined to the inner peripheral edge of the lower guard frame 46.

  The lower guard frame 46 is integrally formed with a transverse beam portion 48 that extends across the frame in the left-right direction. A pair of footrest members 60 disposed on the left and right sides of the travel lever 23 are provided on the surface of the lateral beam portion 48 on the operation space S side. The foot placement member 60 is disposed above the offset pedal 24. Details of the footrest member 60 will be described later.

  A through hole 46 a is formed in the lower guard frame 46 corresponding to the screw hole of the mounting seat 33. Specifically, three through holes 46a are formed at the left edge of the lower guard frame 46 with a space in the vertical direction. Here, the left front support column 31 has a shape in which the lower end portion is bent rightward, and therefore, the lowermost through hole 46 a at the left edge of the lower guard frame 46 is bent to the front support column 31. Corresponding to the shape, it is formed at a position shifted to the right side from the other through holes 46a.

  Two through holes 46a are formed in the right edge of the lower guard frame 46 with a space in the vertical direction. Here, the lower through hole 46 a is formed at a connection position with the left end portion of the cross beam portion 48 in the lower guard frame 46. As described above, when the vicinity of the end portion of the cross beam portion 48 can be fastened with the fastening bolt 55, the load applied to the cross beam portion 48 when the foot is placed on the footrest member 60 is moved to the front side via the mounting seat 33. Since it is also distributed to the support column 31 side, deformation of the cross beam portion 48 can be suppressed.

  The lower front guard 45 is attached to the front column 31 by inserting the fastening bolt 55 into the through hole 46 a and screwing it to the attachment seat 33.

  The lower end portion of the upper front guard 41 and the upper end portion of the lower front guard 45 are connected by a connecting member 50. Specifically, the connecting member 50 includes a reinforcing plate 51 as a reinforcing member that extends in the left-right direction and covers the gap between the upper front guard 41 and the lower front guard 45, and the reinforcing plate 51 is connected to the upper front guard 41 and the lower front guard. A fastening bolt 55 and a fastening nut 56 are provided as fastening members fastened to the guard 45.

  The reinforcing plate 51 extends in the left-right direction along the lower edge of the upper guard frame 42 and the upper edge of the lower guard frame 46, and extends downward along the side edge of the lower guard frame 46 at both ends thereof. An extension 52 is provided to extend to the front.

  On the upper end side of the reinforcing plate 51, three through holes 51a are formed at intervals in the left-right direction. On the lower end side of the reinforcing plate 51, a through hole 51a is formed at the center position in the left-right direction. The extension portion 52 is formed with a notch hole 52a that opens downward.

  Fastening is performed on the surface of the lower edge of the upper guard frame 42 and the upper edge of the lower guard frame 46 on the side of the operating space S at positions corresponding to the through holes 51a of the reinforcing plate 51 and the cutout holes 52a of the extension 52. The nut 56 is welded.

  The reinforcing plate 51 is attached to the upper front guard 41 and the lower front guard 45 by inserting fastening bolts 55 into the through holes 51a and the cutout holes 52a and screwing them to the fastening nuts 56.

  On the side edge of the driving space S in the upper front guard 41 and the lower front guard 45, recessed portions 42b and 46b that are recessed so that a part of the front column 31 is exposed in front view are provided. .

  Specifically, the upper guard frame 42 is provided with a recess 42b by recessing the lower left corner. The lower guard frame 46 has a recess 46b formed by recessing the upper left corner. Thereby, the exposed part of the front side support | pillar 31 can be utilized as a handrail when a worker gets on and off the driving space S.

  As shown in FIGS. 6 and 7, the footrest member 60 includes a pair of side wall plates 61 erected with a space in the left-right direction, and a tread plate 62 that connects the pair of side wall plates 61 together.

  The side wall plate 61 is disposed between the meshes of the lower mesh body 47. A lower side portion of the front edge portion of the side wall plate 61 is welded to the cross beam portion 48. The upper edge portion of the side wall plate 61 is located above the upper edge portion of the cross beam portion 48, and is cut out so as to be inclined obliquely downward while extending rearward.

  The tread plate 62 is placed on the inclined portion of the upper edge portion of the side wall plate 61 and welded to the side wall plate 61. Accordingly, the upper edge portion of the tread plate 62 is disposed at a position above the upper edge portion of the lateral beam portion 48 and spaced from the lateral beam portion 48 toward the operation space S. And the upper surface of the tread board 62 protrudes to the driving | running | working space S side, and becomes a tread for an operator to put a foot. The tread surface of the tread plate 62 is inclined obliquely downward from the lower front guard 45 toward the driving space S.

  With such a configuration, even when the vehicle is in a forward leaning posture at a work site that is inclined downward, the posture can be maintained by the operator placing his / her foot on the footrest member 60 and standing on it. Furthermore, since the tread surface of the footrest member 60 is inclined obliquely downward toward the rear, the tread surface becomes substantially horizontal in the down-sloped work site, so that the operator can easily put the foot on and step on it. .

  Further, when the footrest member 60 is visually recognized from the viewpoint position P of the operator seated on the driving seat 21, the front of the vehicle can be confirmed from the gap between the upper edge portion of the tread plate 62 and the lateral beam portion 48. Thereby, an operator's visual field becomes favorable and can confirm a work condition appropriately.

<< Embodiment 2 >>
FIG. 8 is a perspective view showing the configuration of the footrest member according to the second embodiment, and FIG. 9 is a side sectional view. Hereinafter, the same portions as those in the first embodiment are denoted by the same reference numerals, and only differences will be described.

  As shown in FIGS. 8 and 9, the footrest member 60 includes a pair of side wall plates 61 erected at intervals in the left-right direction, and a plurality of slit plates 65 that connect the pair of side wall plates 61. Have.

  A lower side portion of the front edge portion of the side wall plate 61 is welded to the cross beam portion 48. The upper edge portion of the side wall plate 61 is cut out so as to be inclined obliquely downward while extending rearward.

  The slit plate 65 is disposed between the pair of side wall plates 61, and both end portions thereof are welded to the side wall plate 61. Here, the slit plate 65 connects the pair of side wall plates 61 in a posture inclined obliquely downward from the operation space S toward the lower front guard 45. Three slit plates 65 are arranged at intervals in the thickness direction.

  With such a configuration, when the footrest member 60 is viewed from the viewpoint position P of the operator seated on the driving seat 21, the vehicle passes through the meshes of the lower mesh body 47 from the gaps of the plurality of slit plates 65. You can confirm the front. Thereby, an operator's visual field becomes favorable and can confirm a work condition appropriately.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the present embodiment, the through hole 46a is formed at the connection position of the lower guard frame 46 with the left end portion of the cross beam portion 48, and the vicinity of the left end portion of the cross beam portion 48 is fastened with the fastening bolt 55. It is not limited to this form. For example, a through hole 46 a may be formed at a position where the lower guard frame 46 is connected to the right end portion of the cross beam portion 48, and the vicinity of both ends of the cross beam portion 48 may be fastened with the fastening bolts 55.

  Moreover, in this embodiment, although the footrest member 60 was set as the structure which has a pair of side wall board 61 and the tread board 62 which connects side wall board 61, it is not limited to this form. For example, as a configuration in which a pair of side wall plates 61 and a rod-like member such as a round pipe are laid across the pair of side wall plates 61, an operator may place his feet on the round pipe.

  Moreover, although this embodiment demonstrated the offset pedal 24 which operates the offset cylinder which rotates the front boom 14b of the boom 14 in the left-right direction as an operation pedal, it is not limited to this form. For example, in a construction machine including a swing cylinder that rotates the boom 14 in the left-right direction, a swing pedal that operates the swing cylinder may be used. Moreover, the pedal used for operation of another special attachment may be sufficient.

  Further, in the present embodiment, the guard member is configured by the lower mesh body 47 stretched in the frame of the lower guard frame 46, but it is only necessary to protect the driving space S while ensuring the visibility. For example, the guard member may be configured by using a transparent resin panel material or the like.

  As described above, the present invention provides a highly practical effect that an operator can maintain a posture even when the vehicle is tilted forward. high.

DESCRIPTION OF SYMBOLS 10 Construction machine 11 Lower traveling body 12 Upper turning body 24 Offset pedal (operation pedal)
31 Front strut 33 Mounting seat 45 Lower front guard 46 Lower guard frame 46a Through hole 47 Guard member (lower mesh)
48 Cross beam 55 Fastening bolt (fastening member)
60 Footing member 61 Side wall plate 65 Slit plate S Operating space

Claims (6)

A front guard structure of a construction machine in which an upper swing body is mounted on a lower traveling body so as to be freely rotatable, and a front side of a vehicle in an operation space of the upper swing body is covered with a front guard,
The front guard includes a guard frame, a transverse beam portion that is provided integrally with the guard frame and crosses the inside of the guard frame in the vehicle width direction, and a guard member provided within the frame of the guard frame. ,
A front guard structure for a construction machine , wherein a footrest member having a tread surface projecting toward the operation space at a position distant from the floor surface of the operation space is provided on the horizontal beam portion. In claim 1,
The front guard structure for a construction machine, wherein the tread surface is inclined obliquely downward from the front guard toward the operation space. In claim 1 or 2,
A column that is installed in front of the vehicle in the driving space and is provided with a mounting seat for attaching the front guard;
A fastening member for fastening the front guard to the mounting seat;
A through hole into which the fastening member can be inserted is formed at the connection position with the end of the cross beam portion in the guard frame,
The mounting seat is provided at a position corresponding to the through hole,
The front guard is attached to the support column by inserting the fastening member into the through hole and fastening the fastening member to the mounting seat. In any one of claims 1 to 3,
An operation pedal disposed in front of the vehicle on the floor surface of the driving space;
The front guard structure for a construction machine, wherein the footrest member is disposed above the operation pedal. A front guard structure of a construction machine in which an upper swing body is mounted on a lower traveling body so as to be freely rotatable, and a front side of a vehicle in an operation space of the upper swing body is covered with a front guard,
The front guard includes a guard frame, a transverse beam portion that is provided integrally with the guard frame and crosses the inside of the guard frame in the vehicle width direction, and a guard member provided within the frame of the guard frame. ,
The transverse beam portion is provided with a footrest member having a tread surface protruding to the driving space side,
The footrest member connects the pair of side wall plates that are erected at an interval in the vehicle width direction and the pair of side wall plates in a posture inclined obliquely downward from the front guard toward the driving space. A tread board,
A front guard structure for a construction machine, wherein the upper edge portion of the tread plate is disposed at a position above the upper edge portion of the transverse beam portion and spaced from the transverse beam portion toward the operation space. . In any one of claims 1 to 4,
The footrest member connects the pair of side wall plates that are erected at an interval in the vehicle width direction, and the pair of side wall plates in a posture inclined obliquely downward from the driving space toward the front guard. A front guard structure for a construction machine, comprising a plurality of slit plates.

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