JP2005273276A - Step device of walking self-propelled work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a step device of a walking self-propelled work machine capable of improving working efficiency, by coping with switching by quickly switching step arrangement in response to a state. <P>SOLUTION: This step device 9 of the walking self-propelled work machine, is arranged in the walking self-propelled work machine having a traveling device 2 having left-right crawlers 1, left-right handles 8 to be gripped by an operator arranged in an upper part of this traveling device 2, and a loader device 7 rotatably arranged in the vertical direction on the front side of the traveling device 2. The step device has a step 27 for allowing the operator to ride in a standing state, left-right step support brackets 30 arranged on the rear side of the traveling device 2 and having the axis for rotatably supporting the step 27 via a rotary pin 29 in the substantially horizontal direction, and left-right springs 36 for energizing the rotational movement of the step 27 so as to be stored and arranged, for example, by uplifting the step 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a walking self-propelled working machine in which an operator grips a handle and walks to perform a work by causing a traveling device to self-run, and in particular, an operator can stand up when moving to a work place. The present invention relates to a step device for a walking self-propelled working machine.

  As a conventional technique, a traveling device provided with an endless track crawler, an operator grip handle provided on the upper portion of the traveling device, and provided on the front side of the traveling device so as to be pivotable in the vertical direction. A loader type walking self-propelled working machine provided with a working machine (loader device) is disclosed (see, for example, Patent Document 1). This walking self-propelled working machine scraped, scraped or scooped the bucket against the work object (sediment, snow, fertilizer, etc.) located on the front side while driving forward with the traveling device. Then, extrude, unload and transport. That is, various small-scale processing operations are performed by applying a propulsive force to the front side of the traveling device to the work object.

JP 2004-52251 A

However, there are the following problems in the above-described prior art.
In other words, when the walking self-propelled working machine is moved to the work place, it is transported by a separately prepared transportation means, or the traveling device is self-propelled while the operator is walking. Therefore, there is a need to install steps and the like on which the operator can stand on the work machine for the purpose of the operator getting on the work machine and moving. However, when such a step is always attached to the work machine, the step may interfere with, for example, a curb on the ground or an abandoned object during work in a narrow place or when moving backward, and workability may be reduced. is there. However, if steps are attached or removed depending on the situation during movement or work, time is required for this, and work efficiency is reduced.

  An object of the present invention is to provide a step device of a walking self-propelled working machine that can quickly change the step arrangement according to the situation and can improve the work efficiency.

  (1) In order to achieve the above object, the present invention provides a traveling device having an endless track crawler, an operator grip handle provided at the top of the traveling device, and a vertical direction on the front side of the traveling device. In the step device of the walking self-propelled working machine provided in the walking self-propelled working machine provided with a work machine rotatably provided on the step, a step on which an operator can stand and a rear side of the traveling device And a step support bracket that rotatably supports the step with a substantially horizontal direction as a rotation axis, and a rotation urging means that urges the rotation of the step so that the step is housed and disposed. Is provided.

  According to the present invention, the step support bracket provided on the rear side of the traveling device supports the step so as to be rotatable about the substantially horizontal direction as the rotation axis, and the step is accommodated and arranged, for example, the step is The rotation of the step is urged by the rotation urging means so that it is raised and arranged vertically. Thereby, for example, when moving to a work place together with a walking self-propelled working machine, the operator turns until the step is horizontally arranged against the urging force of the turning urging means, and then the operator steps Stand up. Thus, the operator can get on the work machine and move the traveling device by self-propelling. After that, for example, when the operator gets off the step with the intention of working the traveling device while walking, the step is raised and stored by the urging force of the rotation urging means. . As a result, the operator can start the work immediately, and the work does not interfere with, for example, the curbstones or the abandoned objects on the ground when working in a narrow place or when moving backward, thereby improving workability.

  As described above, according to the present invention, the step arrangement can be quickly switched according to the situation such as movement or work, and work efficiency can be improved.

  (2) In the above (1), preferably, a rotation restricting means for restricting a rotation range of the step is further provided.

  (3) In the above (1) or (2), preferably, the rotation urging means is a spring provided in an extendable manner between the step and the step support bracket.

  (4) In any one of the above (1) to (3), preferably, when the step is rotated against the urging force of the rotation urging means, a stool on which an operator places a foot Part is provided in the step.

  (5) In any one of the above (1) to (4), preferably, the step is formed in a lattice shape.

  According to the present invention, it is possible to quickly switch and cope with the step arrangement according to the situation, and it is possible to improve work efficiency.

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

  FIG. 1 is a side view showing the overall structure of a walking self-propelled working machine to which an embodiment of a step device for a walking self-propelling working machine of the present invention is applied, and FIG. 2 is a walking self-propelled working machine. FIG. 2 is a top view showing the overall structure (however, a step device described later is not shown for convenience). In FIG. 1, a step device described later represents a state in which the steps are stored and arranged (vertically arranged).

  1 and 2, this walking self-propelled working machine is suitable for relatively small-scale various processing operations, and includes a traveling device 2 having left and right endless track tracks 1 as traveling means, The lower frame (body frame) 3 that forms the basic structure of the traveling device 2 as a strength member, the power unit 4 provided on the upper portion of the lower frame 3, the front cover 5 covering the power unit 4, the lower frame 3 and the front frame A work machine support frame 6 provided on the front side (left side in FIG. 1) of the section cover 5 and a loader device (work machine) 7 provided on the work machine support frame 6 so as to be pivotable (can be raised and lowered) in the vertical direction. And a left / right handle 8 extending from the lower frame 3 to the upper rear side (upper right side in FIG. 1), and a step device 9 provided at the rear side (right side in FIG. 1) of the lower frame 3. Yes.

  The traveling device 2 includes a track frame portion 10 provided at a lower portion of the lower frame 3, left and right drive wheels (sprockets) 11 rotatably supported on the left and right sides of the track frame portion 10, and a track frame. Left and right first driven wheels 12 rotatably supported in front of the left and right sides of the portion 10 and left and right second driven wheels 13 rotatably supported below the left and right drive wheels 11. And the left and right crawler belts 1 wound around three driving wheels including the driving wheel 11, the first driven wheel 12, and the second driven wheel 13, respectively.

  The loader device 7 includes an arm 14 (lift arm) that is rotatably connected to the work implement support frame 6, and a bucket (work implement) 15 that is rotatably connected to a distal end portion of the arm 14. The loader type working machine is arranged so that the opening of the bucket 15 faces forward in the grounding work state. The position of the arm 14 in the width direction is arranged between the left and right crawler belts 1.

  The arm 14 is integrally composed of a pair of left and right arm frames 16 and connecting pins 17 and 18 connected between the arm frames 16. An upper end side of an arm hydraulic cylinder (double-acting type) 19 is rotatably connected to the rear side connecting pin 17 of the arm 14, and a lower end side of the arm hydraulic cylinder 19 is rotatable to the work implement support frame 6. It is connected to the. As a result, the arm 14 moves up and down in accordance with the expansion and contraction drive of the arm hydraulic cylinder 19.

  Further, an intermediate portion of a link main body (bell crank) 20 is rotatably supported by the front side connecting pin 18 of the arm 14. A connection bar 21 is rotatably connected to one side (the lower side in FIG. 1) of the link main body 20, and a tip end portion of the connection bar 21 is rotatably connected to a bracket portion 15 a of the bucket 15. . Further, the other end (upper side in FIG. 1) of the link body 20 is rotatably connected to the front end side of the bucket hydraulic cylinder (double-acting type) 22, and the rear end side of the bucket hydraulic cylinder 22 is the work implement support frame. 6 is rotatably connected. Thereby, the inclination angle of the bucket 15 with respect to the arm 14 changes according to the expansion / contraction drive of the bucket hydraulic cylinder 22, in other words, the direction facing the opening side of the bucket 15 as viewed from the ground side is changed (the lifting operation is performed). It is like that.

  Although not shown in detail, the power unit 4 is an engine as a prime mover, a working machine hydraulic pump driven by the engine, and a pressure from the working machine hydraulic pump to the arm hydraulic cylinder 19 and the bucket hydraulic cylinder 22. Arm control valve and bucket control valve for controlling the flow of oil, a variable displacement travel hydraulic pump driven by an engine, and a travel hydraulic motor driven by pressure oil discharged from the travel hydraulic pump Etc. The driving force of the traveling hydraulic motor is decelerated and distributed by a gear mechanism (not shown), and the distributed driving force is applied to the left and right drive wheels 11 via a left / right clutch mechanism (not shown). It is to be transmitted.

  The left and right handles 8 for gripping the operator are provided with side clutch levers 23 that can be gripped together with the handle 8. The left and right side clutch levers 23 are respectively connected to the left and right clutch mechanisms described above via, for example, rods (wires), and to the drive wheels 11 in the corresponding clutch mechanisms while the side clutch levers 23 are not gripped. When the side clutch lever 23 is gripped, the driving force transmission is cut off. Thus, for example, when it is desired to turn to the left (or right, the same applies to the parenthesis in the following), the driving force applied to the left (or right) drive wheel 11 by gripping only the left (or right) side clutch lever 23. However, since the driving force to the right (or left) driving wheel 11 is transmitted while the transmission is interrupted, the entire work machine is advanced to turn left (or right).

  An operation unit cover 24 is provided between the left and right handles 8, and a forward / reverse operation lever 25 and a loader device operation lever 26 are disposed on the operation unit cover 24.

  The forward / reverse operation lever 25 switches the forward or reverse movement of the traveling device 2 by operating in the front-rear direction. The forward / reverse operation lever 25 is a known swash plate adjusting mechanism (not shown) that variably adjusts the tilt of the swash plate of the variable displacement traveling hydraulic pump described above via, for example, a rod (may be a wire). Mechanically linked. Then, for example, by operating the forward / reverse operation lever 25 to the rear side in the front-rear direction (left side in FIG. 1), the inclination of the swash plate of the traveling hydraulic pump is switched to one side according to the operation amount. Pressure oil from the hydraulic pump is supplied to the traveling hydraulic motor and rotated in one direction to rotate the drive wheel 11 in one direction, and the traveling device 2 is advanced at a corresponding speed. Further, for example, by operating the forward / reverse operation lever 25 to the front side in the front / rear direction (right side in FIG. 1), the inclination of the swash plate of the traveling hydraulic pump is switched to the other side according to the operation amount. Pressure oil from the hydraulic pump is supplied to the traveling hydraulic motor and rotated in the other direction to rotate the drive wheel 11 in the other direction, and the traveling device 2 is moved backward at a corresponding speed.

  The loader device operation lever 26 operates to move the arm 14 up and down by operating in the front-rear direction, and operates the direction change (reverse) operation of the bucket 15 by operating in the left-right direction. The loader device operation lever 26 is mechanically connected to the arm control valve and the bucket control valve, for example, via a rod (or wire), for example. For example, by operating the loader device operating lever 26 to the front side in the front-rear direction, the arm control valve is switched to one side according to the operation amount, and the pressure oil is supplied to the bottom portion of the arm hydraulic cylinder 19 and extended. Thus, the arm 14 is raised. Further, for example, by operating the loader device operating lever 26 in the back and forth direction, the arm control valve is switched to the other side according to the operation amount, and the pressure oil is supplied to the rod portion of the arm hydraulic cylinder 19 to shorten it. Thus, the arm 14 is lowered.

  Similarly, for example, by operating the loader device operation lever 26 to the left and right in the left-right direction (front side in FIG. 1), the bucket control valve is switched to one side according to the operation amount, and the pressure oil is supplied to the bucket. It is supplied to the bottom portion of the hydraulic cylinder 22 and extended so that the opening side of the bucket 15 is directed relatively upward (relative to the axis of the arm 14). Further, for example, by operating the loader device operation lever 26 to the right and left in the left-right direction (back side toward the paper surface in FIG. 1), the bucket control valve is switched to the other side according to the operation amount, and the pressure oil is used for the bucket. It is supplied to the rod portion of the hydraulic cylinder 22 and shortened so that the opening side of the bucket 15 is directed relatively downward (relative to the axis of the arm 14).

  Next, the details of the step device 9 which is the main part of the present invention will be described. FIG. 3 is a partially enlarged side view of the walking self-propelled working machine showing the overall structure of the step device 9, FIG. 4 is a rear view seen from the direction of arrow IV in FIG. 3, and FIG. 3 is a partially enlarged side view of a V portion in FIG. 3, and FIG. 6 is a partially enlarged rear view of a VI portion in FIG. 3 to 6, a state in which steps to be described later are horizontally arranged is indicated by a solid line, and a state in which the steps are accommodated and arranged (vertically arranged) is indicated by a two-dot chain line.

  In FIG. 3 to FIG. 6 and FIG. 1 described above, the step device 9 includes, for example, a grid-like step 27 on which the operator can stand in a horizontally arranged state, and the rear side of the lower frame 3 (FIG. 3). A pair of left and right steps, which are fixed to the middle right) with bolts 28 and whose shaft core rotatably supports step 27 via a rotation pin (rotation shaft) 29 in a substantially horizontal direction (left and right direction in FIG. 4). And a support bracket 30.

  Steps 27 are, for example, arranged at a predetermined interval (an interval at which the operator does not step on the foot) in the front-rear direction (the left-right direction in FIG. 3), and extend in the left-right direction (the left-right direction in FIG. 4) to be uneven. A plurality of treads 31 formed continuously, left and right side plates 32 provided on the left and right end sides (left and right in FIG. 4) of each tread 31 and extending in the front-rear direction, and these left and right sides For example, a substantially columnar left / right footrest portion 33 that protrudes outward at appropriate positions of the plate 32 is provided. The left / right footrest portion 33 of step 27 is for an operator to put one foot on when step 27 is rotated from a vertical state (shown by a two-dot chain line) to a horizontal state (shown by a solid line). The shoe 1 protrudes to the outside in the width direction.

  The left / right step support bracket 30 has, for example, a shape that is bent twice and protrudes outward. A through hole is provided in a position corresponding to the rotation pin 29 on the rear projecting side of the left / right step support bracket 30 and the front side of the left / right plate 32 of the step 27. Further, for example, retaining rings are provided at both ends of the rotation pin 29 so that the rotation pin 29 cannot be removed from the through hole.

  Further, support pins 34 projecting inward are provided on the front side of the left and right side plates 32 of the step 27, respectively, and above the rotation pins 29 in the left and right step support brackets 30, respectively. A protruding support pin 35 is provided. Then, between the support pin 34 of the left side plate 32 and the support pin 35 of the left step support bracket 30 in step 27, and between the support pin 34 of the right side plate 32 and the support pin 35 of the right step support bracket 30 in step 27. The springs (coil springs) 36 are locked, and the left and right springs 36 can be expanded and contracted between the step 27 and the left / right step support bracket 30. At this time, as the step 27 is rotated from the horizontal state to the vertical state, the support pins 34 that are similarly rotated are arranged so as to approach the support pins 35 of the corresponding step support bracket 30. With such a structure, the step 27 is centered around the rotation pin 29 by the predetermined urging force of the left and right springs 36 (the urging force set in consideration of the weight of the step 27 and the operator). It is rotated in the A direction (counterclockwise direction in FIGS. 3 and 5) and is started up.

  Further, a stopper pin 37 is installed on the front side of the left and right side plates 32 of the step 27, and the left and right step support brackets 30 are respectively provided with stoppers for the rotated step 27. Substantially semicircular notches 30a and 30b are formed at positions where the pins 37 abut. For example, when step 27 is rotated in the direction of arrow A to be vertically arranged, the stopper pin 37 of step 27 comes into contact with the upper notch 30a of the step support bracket 30, and step 27 is rotated further in the direction of arrow A. It does not move. Further, for example, when the step 27 is rotated in the direction of the arrow A ′ (clockwise in FIGS. 3 and 5) and is horizontally disposed, the stopper pin 37 of the step 27 is brought into contact with the lower notch 30b of the step support bracket 30. In contact, step 27 is prevented from further rotation in the direction of arrow A ′.

  In the above, the left and right springs 36 constitute a rotation urging means for urging the rotation of the steps so that the steps described in the claims are accommodated and disposed. The notches 30a and 30b of the step support bracket 30 constitute a rotation limiting means for limiting the rotation range of the step described in the claims.

  Next, the operation and effect of this embodiment will be described.

  For example, when moving to a work place together with a walking self-propelled working machine, the operator hangs one leg on either the left or right footrest portion 33 of the vertically placed step 27 and the left and right springs 36 The operator stands on the step 27 by rotating it until the step 27 becomes horizontal against the urging force. As a result, the operator gets on the work machine, operates the forward / reverse operation lever 25 in the front / rear direction, and holds the left / right handle 8 (and the left / right clutch lever 23) to cause the traveling device 2 to self-travel. Can move. Thereafter, for example, when the operator gets off the step 27 with the intention of working the traveling device 2 while walking, the step 27 is raised and stored by the urging force of the spring 37. . As a result, the operator can start work immediately, and step 27 does not interfere with, for example, a curb on the ground or an abandoned object when working in a narrow space or when moving backward, thereby improving workability. .

  As described above, in this embodiment, the arrangement of step 27 can be promptly switched between the vertical state and the horizontal state according to the situation such as movement or work, and work efficiency can be improved. .

  Further, by forming the step 27 in a lattice shape, the deposit (eg, mud) on the operator's sole can be naturally dropped in the horizontal state of the step 27, and walking in the vertical state of the step 27. Gauges and the like arranged on the rear side of the self-propelled work machine can be visually confirmed.

  Further, in the state where the step 27 is stored and arranged, the left / right footrest portion 33 of the step 27 prevents the operator's foot walking on the left / right footwear 1, 1 of the traveling device 2 from being caught. There is also an effect.

  In the above embodiment, the case where the left and right springs 36 are provided between the step 27 and the left / right step support bracket 30 as the rotation urging means has been described as an example. However, the embodiment is not limited thereto. Absent. That is, for example, the spring 36 may be provided between the step 27 and the lower frame 3. Further, instead of the spring 36, for example, an actuator such as a hydraulic cylinder or an electric cylinder may be provided, and the actuator may be extended and contracted to rotate the step 27 according to the operation of the switch. In these cases, the same effect as described above can be obtained.

  In the above embodiment, the configuration in which step 27 is formed in a lattice shape has been described as an example. However, the present invention is not limited to this. That is, for example, the step may be formed of a thick plate, and a transparent member may be partially used so that gauges and the like can be visually observed in a state where the step is stored and arranged. In this case, the same effect as described above can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view showing the whole structure of the walking self-propelled working machine with which one Embodiment of the step apparatus of the walking self-propelled working machine of this invention was applied, and represents the state by which the step was accommodated and arrange | positioned. It is a top view showing the whole structure of the walk self-propelled work machine to which one embodiment of the step device of the walk self-propelled work machine of the present invention is applied. It is a partial expanded side view of the walking self-propelled working machine showing the whole structure of one embodiment of the step device of the walking self-propelling working machine of the present invention. It is the rear view seen from the arrow IV direction in FIG. FIG. 4 is a partially enlarged side view of a V portion in FIG. 3. It is the elements on larger scale of the VI section in FIG.

Explanation of symbols

1 endless track crawler 2 traveling device 7 loader device (work machine)
8 Handle 9 Step device 27 Step 29 Rotating pin (Rotating shaft)
30 Step support brackets 30a, 30b Notch (rotation limiting means)
33 Footrest 36 Spring (rotating biasing means)
37 Stopper pin (rotation limiting means)

Claims (5)

A walking device provided with a traveling device provided with an endless track crawler, an operator grip handle provided at an upper portion of the traveling device, and a work implement provided on the front side of the traveling device so as to be vertically rotatable. In the step device of the walking self-propelled working machine provided in the traveling work machine,
Steps that the operator can stand on,
A step support bracket provided on the rear side of the traveling device and rotatably supporting the step with a substantially horizontal direction as a rotation axis;
The step device of the walking self-propelled working machine, comprising: a rotation urging unit that urges the rotation of the step so that the step is stored and disposed.   The step device of the walking self-propelled working machine according to claim 1, further comprising a rotation restricting means for restricting a rotation range of the step.   The step device of the walking self-propelled working machine according to claim 1 or 2, wherein the rotation urging means is a spring provided in an extendable manner between the step and the step support bracket. Step device for self-propelled work machines.   The step device of the walking self-propelled working machine according to any one of claims 1 to 3, wherein when the step is rotated against the urging force of the rotation urging means, the operator steps his / her foot. A step device for a walking self-propelled working machine, characterized in that a step is provided on the step.   The step device of the walking self-propelled working machine according to any one of claims 1 to 4, wherein the steps are formed in a lattice shape.

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