JP2017226236A - Hand rail structure for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand rail structure for a work vehicle that can keep a radius of rotation of a vehicle body compact.SOLUTION: A hand rail structure 2 for a work vehicle includes: a vehicle body 10; a step 3 stepped by a foot in going up/down to/from the vehicle body 10; and a hand rail 4 grasped by a hand in going up/down to/from the vehicle body 10. A planar shape when the hand rail 4 is viewed from above the vehicle is formed along a radius of rotation R of the vehicle body 10 so that the radius of rotation R of the vehicle body 10 does not become a large size.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a handrail structure for a work vehicle such as a mobile crane.

  2. Description of the Related Art Conventionally, work vehicles such as mobile cranes require maintenance of an engine mounted on a vehicle body (traveling body), so steps and handrails (handrails) for raising and lowering the vehicle body (traveling body) are required. ) Is often installed.

  Although it is not a step or a handrail installed on the vehicle body, Patent Document 1 discloses a hydraulic excavator in which a handle and / or a step are installed so as not to protrude from the turning radius of the turning frame. According to this configuration, since the handle and the step are provided within the turning radius of the counterweight, it is possible to prevent the handle and the step from being damaged during the turning.

JP 2001-279714 A

  However, the handle and the step of Patent Document 1 described above are installed on the turning frame of the hydraulic excavator, and do not consider the turning radius when the work vehicle travels. For this reason, it cannot be applied to a handrail installed on the vehicle body of a mobile crane with a narrow vehicle width that is often used in recent years, and the turning radius of the vehicle body cannot be kept compact.

  Therefore, an object of the present invention is to provide a handrail structure for a work vehicle that can keep the turning radius of the vehicle body compact.

  In order to achieve the above object, a handrail structure for a work vehicle according to the present invention includes a vehicle body, a step to be stepped on when raising and lowering the vehicle body, and a handrail gripped by hand when raising and lowering the vehicle body. The plan view of the handrail viewed from above the vehicle is formed so as to follow the rotation radius of the vehicle body so that the rotation radius of the vehicle body does not increase.

  As described above, the handrail structure of the work vehicle according to the present invention includes the vehicle body, the step, and the handrail, and the planar shape of the handrail viewed from above the vehicle rotates the vehicle body so that the rotation radius of the vehicle body does not increase. Since it is formed along the radius, the turning radius of the vehicle body can be kept compact even if the vehicle body rotates during traveling.

It is a side view of a rough terrain crane. It is a top view of a rough terrain crane. It is a perspective view of the handrail structure of Example 1. It is a top view of the handrail structure of Example 1. 3 is a plan view of a handrail of Example 1. FIG. It is a front view of the handrail of Example 1. It is explanatory drawing of the state which rises on a vehicle body. It is explanatory drawing of the state which gets off from on a vehicle body. It is a perspective view of the handrail structure of Example 2. It is a top view of the handrail structure of Example 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, although a rough terrain crane will be described as an example of the work vehicle, the present invention is not limited to this. The present invention can also be applied to other mobile cranes such as all terrain cranes and aerial work platforms.

(Overall configuration)
First, the whole structure of the rough terrain crane 1 as a work vehicle provided with the handrail structure of the work vehicle of this invention is demonstrated using FIG. 1, FIG. The rough terrain crane 1 is attached to a vehicle body (traveling body) 10 that is a main body portion of a vehicle having a traveling function, outriggers 11,. A swivel base 12 and a boom 14 attached to a bracket 13 standing on the swivel base 12 so as to be raised and lowered are provided.

  Although the vehicle body 10 is formed in a flat carriage shape as a whole, an engine (not shown) is disposed at the rear end, and an engine box 10a for housing the engine and a ventilator 10d protrude upward. It is installed as follows. The engine box 10a includes a maintenance opening on the side facing the vehicle front side, and the opening is closed by a removable plate. Further, an oil supply port 10b for a torque converter is disposed in front of the engine box 10a. The torque converter oil supply port 10b is closed by a removable plate. As is well known, since the torque converter uses oil, it is necessary to supply oil by opening the torque converter oil supply port 10b every predetermined period. And the handrail structure 2 mentioned later is formed in the right rear part of the vehicle body 10 of the rough terrain crane 1 of a present Example.

  The swivel base 12 has a pinion gear to which the power of the swivel motor is transmitted, and the pinion gear meshes with a circular gear provided on the vehicle body 10 to rotate around the swivel axis. The swivel base 12 is configured by attaching various devices to a pair of left and right swivel frames 120 extending in the front-rear direction. Specifically, the swivel base 12 includes a bracket 13 in which the rear portion of the swivel frame 120 protrudes upward, a boom 14 that can be raised and lowered on the bracket 13, and winches disposed on the left and right of the rear portion of the swivel frame 120. The housing 17 is mainly composed of a cockpit 18 disposed on the front right side and a counterweight 19 installed on the rear end surface of the winch housing 17.

(Structure of handrail structure)
Next, the structure of the handrail structure 2 is demonstrated using FIGS. The handrail structure 2 of the working vehicle according to the present embodiment includes a vehicle body 10 at a rear end portion of the vehicle body 10, steps 3 (31, 32) to be stepped on when raising and lowering the vehicle body 10, And handrails 4 (5, 6) that are gripped by a hand.

  Step 3 includes a first step 31 at the uppermost stage, a second step 32 at the second stage, and a third step 33 at the lowermost stage (not shown, see FIG. 7). The first step 31 is disposed so as to be flush with the upper surface of the vehicle body 10 and on the same plane. Further, the first step 31 is arranged slightly ahead of the rear end surface of the vehicle body 10 in the vehicle front-rear direction so as to be easily moved up and down. Furthermore, the second step 32 and the third step 33 are arranged below the first step 31. The second step 32 and the third step 33 are arranged behind the first step 31 in the vehicle front-rear direction, and are arranged at substantially the same position as the rear end surface of the vehicle body 10.

  The handrail 4 includes a handrail member 5 on the inner side of the rotation radius of the vehicle body 10 (left side in FIG. 3) and a handrail member 6 on the outer side of the rotation radius of the vehicle body 10 (right side in FIG. 3). Among these, the handrail member 5 inside the turning radius includes a pair of vertical members 51 and 52 that rise from the vehicle body 10 and a horizontal member 53 that connects the upper ends of the pair of vertical members 51 and 52, similarly to the conventional handrail member. It is configured to be integrated (continuously). The vertical members 51 and 52 of the handrail member 5 inside the turning radius are at the same position in the left-right direction of the vehicle, and appear to overlap when viewed from the rear of the vehicle as shown in FIG. That is, the transverse member 53 of the handrail member 5 on the inner side of the turning radius is arranged in parallel to the vehicle longitudinal direction as shown in FIG.

  The handrail member 6 on the outer side of the turning radius is configured by integrally (continuously) including a pair of vertical members 61 and 62 rising from the vehicle body 10 and a horizontal member 63 connecting the upper ends of the pair of vertical members 61 and 62. The Since the vertical members 61 and 62 of the handrail member 6 on the outer side of the turning radius are displaced in the left-right direction of the vehicle, as shown in FIG.

  That is, the planar shape of the lateral member 63 of the handrail member 6 outside the rotation radius as viewed from above as shown in FIGS. 4 and 5 is bent along the rotation radius R of the vehicle body 10 in the middle. That is, the lateral member 63 includes a first straight portion 63a that is bent at an intermediate bending point 63b and is inclined obliquely with respect to the vehicle longitudinal direction, and a second linear portion 63c that is parallel to the vehicle longitudinal direction. It is configured. Therefore, as shown in FIG. 4, the first straight portion 63 a is arranged along the rotation radius R of the vehicle body 10 on the inner side of the rotation radius R of the vehicle body 10.

  From another viewpoint, as shown in FIG. 5, the interval between the handrail members 5 and 6 is narrow on the vehicle rear side, and the interval between the handrail members 5 and 6 is wide on the vehicle front side. Therefore, on the vehicle front side, the space between the handrail members 5 and 6 is kept wide enough to allow a human waist to pass. Specifically, the interval between the handrail members 5 and 6 is wide enough to allow the waist to pass in a state of facing the front, and is preferably, for example, 450 mm or more.

  Moreover, as shown in the front view seen from the vehicle rear of FIG. 6, the lateral member 53 of the handrail member 5 on the inner side of the turning radius (left side in the figure) extends linearly without inclining in the vehicle width direction. On the other hand, the lateral member 63 of the handrail member 6 on the outer side of the turning radius (right side in the drawing) is inclined so as to open upward with respect to the outer side in the vehicle width direction. In other words, the front shape of the lateral member 63 of the handrail member 6 outside the rotation radius when viewed from the rear of the vehicle is such that the distance between the handrail member 6 outside the rotation radius and the handrail member 5 inside the rotation radius is narrow at the bottom and wide at the top. So as to be inclined. In other words, the first straight portion 63a of the lateral member 63 of the handrail member 6 is inclined so that the lower end is inside and the upper end is outside.

  In addition, as shown in the front view seen from the vehicle rear of FIG. 6, the vertical member 62 on the back side of the handrail member 6 on the outer side of the turning radius is below the first step 31 so that it can be easily attached to the existing bracket. It is bent inward.

(Function)
Next, the operation of the handrail structure 2 for a working vehicle according to the present embodiment will be described with reference to FIGS. 4 and 7. First, the operation of the handrail structure 2 of the work vehicle when the vehicle body 10 bends (rotates) during traveling will be described with reference to FIG. When the vehicle body 10 bends from the entrance passage to the exit passage, if the vehicle body turning radius R is large, the width of the exit passage is limited. In other words, if the vehicle body turning radius R is small, the vehicle can enter a narrow passage. When the vehicle body turning radius R turns to the left, for example, both the right front part and the right rear part may be a problem. Therefore, if the handrail 4 is arranged inside the rotation radius R of the vehicle body 10 at the right rear portion as in the present embodiment, the rotation radius R of the vehicle body 10 can be increased without increasing the rotation radius R of the vehicle body 10 by the handrail 4. It can be kept compact. In particular, in the case of a small work vehicle in which the distance between the engine box 10a and the side surface of the vehicle body 10 is small, it is difficult to arrange a handrail with a normal width, and thus the handrail 4 of the present embodiment is highly effective.

  Next, the operation of the handrail structure 2 of the work vehicle when the worker faces the front of the vehicle and rises to the vehicle body 10 will be described with reference to FIG. First, the operator puts one foot (for example, the right foot) on the third step 33 from the rear part of the vehicle body 10 and holds the vertical member 51 with the left hand while holding the vertical member 61 with the right hand. Next, while putting the other leg (for example, the left leg) on the second step 32, the one leg hung on the third step 33 is extended to push up the body. Next, the upper part of the transverse member 53 is grasped with the left hand while the second straight portion 63c of the transverse member 63 is grasped with the right hand. Finally, as shown in FIG. 7, one foot (for example, the right foot) is put on the vehicle body 10 in the first step 31. As shown in the drawing, the left and right handrail members 5 and 6 can be held by hand, and the handrail members 5 and 6 can be held at a height corresponding to the position of the waist even when the first step 31 is put on the foot. It is easy to climb because the distance is wide.

  Then, the worker who has risen on the vehicle body 10 performs work such as engine maintenance using various tools while lying on the vehicle body 10. At this time, the handrail member 5 on the inner side in the rotational direction is adjacent to the engine box 10a, and the vertical member 62 (back side) of the handrail member 6 on the outer side in the rotational direction is disposed on the outer side of the vehicle. Can be taken widely.

  Next, the operation of the handrail structure 2 of the work vehicle when the worker faces the front of the vehicle and gets off the vehicle body 10 will be described with reference to FIG. In this case, it is possible to descend in the reverse order when ascending to the vehicle body 10. That is, while holding the left and right handrail members 5 and 6 by hand, the other step (for example, the left foot) is hung on the second step 32. In this state, since the interval between the handrail members 5 and 6 is wide at a height corresponding to the position of the waist, the remaining thigh of one foot (for example, the right foot) does not interfere with the lateral member 63. . Next, while sliding the left and right hands holding the handrail members 5 and 6 downward, the remaining one foot (for example, the right foot) is put on the third step 33. Finally, while bending one foot (for example, the right foot) hanging on the third step 33, the other foot (for example, the left foot) hanging on the second step 32 is landed.

  Next, the operation of the handrail structure 2 of the work vehicle when the worker gets off the vehicle body 10 facing the rear of the vehicle will be described with reference to FIG. First, one foot (for example, the left foot) is hung on the second step 32 while holding the left and right handrail members 5 and 6 with the back hands. In this state, since the distance between the handrail members 5 and 6 is wide at a height corresponding to the position of the waist, the thigh of one foot (for example, the left foot) does not interfere with the lateral member 63. In addition, since the second step 32 is arranged to be shifted to the rear side of the vehicle with respect to the first step 31, it has a natural posture such as going down the stairs. Next, the other left foot (for example, the right foot) is put on the third step 33 while sliding the left and right hands holding the handrail members 5 and 6 downward. Finally, while bending the other foot (for example, the right foot) hanging on the third step 33, the one foot (for example, the left foot) hanging on the second step 32 is landed.

(effect)
Next, effects provided by the handrail structure 2 of the work vehicle according to the present embodiment will be listed and described.
(1) As described above, the handrail structure 2 of the working vehicle according to the present embodiment includes the vehicle body 10, the step 3 that is stepped on with the foot when the vehicle 10 is raised and lowered on the vehicle body 10, The plan view of the handrail 4 as viewed from above the vehicle is formed along the rotation radius R of the vehicle body 10 so that the rotation radius R of the vehicle body 10 does not increase. For this reason, even if the vehicle body 10 rotates during traveling, the rotation radius R of the vehicle body 10 can be kept compact. Moreover, it becomes easy to move up and down by installing the handrail 4.

  That is, if the plane shape of the handrail 4 is formed along the rotation radius R, the distance from the rotation center (that is, the rotation radius R) does not increase even when the vehicle body 10 rotates. R can be maintained. In particular, this is an effective technique for a small mobile crane or the like where entry into a narrow road is a problem. At the same time, when the operator ascends and descends to the vehicle body 10, the handrail members 5 and 6 can be lifted and lowered with both hands, so that the worker can safely lift and lower.

(2) The handrail 4 includes a handrail member 5 inside the rotation radius and a handrail member 6 outside the rotation radius, and at least the handrail member 6 outside the rotation radius includes a pair of vertical members 61 and 62 rising from the vehicle body 10; The horizontal member 63 that connects the upper ends of the pair of vertical members 61, 62, and the planar shape of the horizontal member 63 of the handrail member 6 on the outer side of the rotation radius when viewed from above the vehicle is along the rotation radius of the vehicle body 10. It is bent halfway. For this reason, since it becomes the handrail member 6 continued from the lower part to the upper part, it is easy to hold | grip with a hand and can raise / lower safely. Furthermore, the space | interval of the handrail member 5 inside a rotation radius and the handrail member 6 outside a rotation radius can be taken more widely in the vehicle front side.

(3) The front shape of the lateral member 63 of the handrail member 6 outside the turning radius when viewed from the side or the rear of the vehicle is such that the distance between the handrail member 6 outside the turning radius and the handrail member 5 inside the turning radius is lower. It is slanted so that it is narrow and wide at the top. For this reason, it becomes possible to pass between the handrail members 5 and 6 with the operator facing the front. That is, as shown in FIG. 7, it is easy to step on one foot on step 31. Furthermore, as shown in FIG. 8, it can pass between the handrail members 5 and 6 with the vehicle facing rearward. Moreover, since the space | interval of the handrail members 5 and 6 in the upper part becomes wide in the upper part because the space | interval of the handrail members 5 and 6 in an upper part becomes wide, the stability during raising / lowering increases. In this case, it is preferable that the position bent from the vertical member 61 to the horizontal member 63 is below the knee position (about 40 cm to about 45 cm) of the adult. In particular, as shown in FIG. 8, when getting off with the vehicle facing rearward, the thigh may interfere with the lateral member 63 when the left foot is bent slightly. By doing so, even when the left foot is slightly bent, the interference between the transverse member 63 and the thigh can be prevented.

(4) The distance between the handrail member 6 on the outer side of the turning radius and the handrail member 5 on the inner side of the turning radius is formed so as to be 450 mm or more between the upper ends of each other. It becomes possible to pass through between the handrail members 5 and 6 while facing.

  Hereinafter, the handrail structure 2 </ b> A including the handrail member 6 having a form different from that of the first embodiment will be described with reference to FIGS. 9 and 10. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  First, the configuration will be described. A handrail structure 2A for a working vehicle according to the present embodiment includes a vehicle body 10, a step 3 that is stepped on with a foot when moving up and down on the vehicle body 10, and a handrail 4 that is gripped with a hand when moving up and down on the vehicle body 10. The plan view of the handrail 4 as viewed from above the vehicle is formed along the rotation radius R of the vehicle body 10 so that the rotation radius R of the vehicle body 10 does not increase.

  The handrail 4 according to the present embodiment includes a handrail member 5 inside the rotation radius and a handrail member 6 outside the rotation radius, and the handrail member 6 outside the rotation radius includes a pair of vertical members 61 and 62 rising from the vehicle body 10. The horizontal member 63 that connects the upper ends of the pair of vertical members 61 and 62 is integrally provided (continuously). The lateral member 63 of the handrail member 6 on the outer side of the turning radius is formed in a straight line when viewed from above the vehicle, and is disposed obliquely along the turning radius of the vehicle body 10.

  That is, as shown in FIGS. 9 and 10, the lateral member 63 of the handrail member 6 is formed in a short and straight shape as compared with the first embodiment, and the entire handrail member 6 is inclined with respect to the handrail member 5 on the inner side of the rotation radius. Arranged. Specifically, it is installed so as to open from the rear of the vehicle toward the front of the vehicle so that the interval becomes wider toward the front side of the vehicle.

Next, functions and effects will be described.
(1) As described above, the handrail structure 2 of the working vehicle according to the present embodiment includes the vehicle body 10, the step 3 that is stepped on with the foot when the vehicle 10 is raised and lowered on the vehicle body 10, The plan view of the handrail 4 as viewed from above the vehicle is formed along the rotation radius R of the vehicle body 10 so that the rotation radius R of the vehicle body 10 does not increase. For this reason, even if the vehicle body 10 rotates during traveling, the rotation radius R of the vehicle body 10 can be kept compact. Moreover, it becomes easy to move up and down by installing the handrail 4.

(2) The handrail 4 includes a handrail member 5 inside the rotation radius and a handrail member 6 outside the rotation radius, and at least the handrail member 6 outside the rotation radius includes a pair of vertical members 61 and 62 rising from the vehicle body 10; The horizontal member 63 that connects the upper ends of the pair of vertical members 61 and 62, and the planar shape of the horizontal member 63 of the handrail member 6 on the outer side of the rotation radius when viewed from above the vehicle is formed in a straight line. It arrange | positions diagonally so that the rotation radius R may be followed. For this reason, it is easy to move up and down by arranging the handrail members 5 and 6 on the left and right, and a work space on the vehicle body 10 can be widened.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus the description thereof is omitted.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to the present invention. included.

  For example, in the first and second embodiments, the case where the handrail structures 2 and 2A are formed on the rear end side of the right rear portion of the vehicle body 10 has been described. However, the present invention is not limited to this. The present invention can also be applied to a case where a handrail is installed on the side surface of the right rear portion of the vehicle body 10 or a case where it is installed on the rear end side (or side surface side) of the left rear portion.

R: radius of rotation (of vehicle body) 1: rough terrain crane (work vehicle); 10: vehicle body;
2: handrail structure; 3: step; 4: handrail;
5: Handrail member; 51: Vertical member; 52: Vertical member; 53: Transverse member;
6: Handrail member; 61: Vertical member; 62: Vertical member; 63: Transverse member;
63a: first straight part; 63b: bending point; 63c: second straight part;
2A: Handrail structure

Claims (5)

A vehicle body, a step that is stepped on with a foot when moving up and down on the vehicle body, and a handrail gripped by hand when moving up and down on the vehicle body,
A handrail structure for a work vehicle, wherein a planar shape of the handrail viewed from above the vehicle is formed along the rotation radius of the vehicle body so that the rotation radius of the vehicle body does not increase. The handrail is composed of a handrail member inside the rotation radius and a handrail member outside the rotation radius,
At least the handrail member outside the radius of rotation is configured by a pair of vertical members rising from the vehicle body, and a lateral member connecting the upper ends of the pair of vertical members,
2. The handrail structure for a work vehicle according to claim 1, wherein a planar shape of the lateral member of the handrail member outside the rotation radius when viewed from above the vehicle is bent halfway along the rotation radius of the vehicle body. The handrail is composed of a handrail member inside the rotation radius and a handrail member outside the rotation radius,
At least the handrail member outside the radius of rotation is configured by a pair of vertical members rising from the vehicle body, and a lateral member connecting the upper ends of the pair of vertical members,
The planar shape of the lateral member of the handrail member on the outer side of the turning radius when viewed from above the vehicle is formed in a straight line, and is disposed obliquely along the turning radius of the vehicle body. Handrail structure of a working vehicle.   The front shape of the lateral member of the handrail member outside the rotation radius when viewed from the side or the rear of the vehicle is such that the distance between the handrail member outside the rotation radius and the handrail member inside the rotation radius is lower. The handrail structure for a work vehicle according to claim 2, wherein the handrail structure is narrow so as to be wide at the top. The work according to claim 2 or 4, wherein an interval between the handrail member on the outer side of the rotation radius and the handrail member on the inner side of the rotation radius is formed to be 450 mm or more between the upper ends of each other. Vehicle handrail structure.