JP2006001315A - Passenger step device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passenger step device of a construction machine capable of avoiding interference with a lower frame without attaching/detaching a step during the retraction, and omitting separate transport of the step from a machine body. <P>SOLUTION: Lower side frames 11L, 11R are retractably provided on the outer side of a lower frame 10 in the vehicle width direction. A step 20 is fixed to the lower side frames 11L, 11R selectively to the upper mounting position or the lower mounting position. When the step 20 is fixed to the lower mounting position, the step is arranged so as not to be protruded upward from the lower side frames 11L, 11R. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a step device for ascending / descending a construction machine, in particular, including a pair of lower side frames that can be retracted inward in the vehicle width direction, and a state in which the width between the pair of lower side frames is reduced. Thus, the present invention relates to a step device for raising and lowering a construction machine that can be transported by being loaded on a truck or the like.

  2. Description of the Related Art Conventionally, a large construction machine equipped with a crawler has an upper swing body mounted on a lower traveling body, and a cabin is provided on the upper swing body. The lower traveling body includes a lower frame on which the upper revolving body is turnably mounted, and a pair of left and right lower side frames disposed outside the lower frame, and the pair of lower side frames. The width between them is provided so that it can be enlarged or reduced.

  When construction work is performed using the construction machine, the width between the pair of lower side frames is set to the maximum width, but when the construction machine is loaded on a truck or the like and transported, The lower side frames need to be retracted inward in the vehicle width direction so as to approach each other to reduce the width between the lower side frames to a minimum (see Patent Document 1).

In addition, an elevating step for an operator to get on and off the cabin is attached to the lower side frame of this type of construction machine (see Patent Document 2). In this case, the step is provided in the vicinity of the upper end of the lower side frame, and the upper end of the step normally protrudes upward from the lower side frame.
JP 2000-142497 A JP-A-9-125457

  As described above, when the construction machine is loaded on a truck or the like and transported, it is necessary to reduce the width between the pair of lower side frames to the minimum. In this case, the upper end of the step is the lower part. Projects upward from the side frame. In this case, when the lower side frame is retracted inward in the vehicle width direction so as to minimize the width between the lower side frames, the upper end of the step interferes with the lower frame.

  Here, in order to avoid the interference, it is only necessary to remove the step from the lower side frame during transportation. In this case, the step of removing and attaching the step is complicated and requires a lot of labor. Furthermore, the removed step needs to be transported separately from the construction machine, and the step may be lost during transportation.

  Therefore, it is not necessary to remove the step when transporting the construction machine, and the technology to be solved in order to prevent the step from interfering with the lower frame during the retracting operation of the lower side frame. The present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is directed to a lower frame on which an upper revolving body is slidably mounted, and in the vehicle width direction outside the lower frame. In a construction machine comprising a pair of lower side frames provided so as to be retractable inward and an ascending / descending step attached to the lower side frame, the steps are located at an upper attachment position on the lower side frame. Alternatively, a step device for raising and lowering a construction machine, which is provided so as to be selectively fixable at a lower mounting position and is formed so as not to protrude upward from the upper end of the lower side frame when the lower mounting position is fixed. provide.

  According to this configuration, the step is fixed at the upper mounting position during construction work, but is fixed at the lower mounting position during transportation. After fixing at the lower mounting position, the lower side frame is retracted inward in the vehicle width direction. During this retracting operation, the step does not protrude upward from the upper end of the lower side frame.

  According to a second aspect of the present invention, the step is provided on the lower side frame so as to be movable in the vertical direction, and fastening means for selectively fixing the step to the upper mounting position or the lower mounting position. A construction apparatus for raising and lowering a construction machine according to claim 1.

  According to this configuration, after the step is moved to the upper attachment position or the lower attachment position, the step is fastened and fixed to the upper attachment position or the lower attachment position by fastening means such as a bolt.

  In the first aspect of the present invention, the lower side frame is retracted toward the lower frame in a state where the step does not protrude upward from the lower side frame. Interference can be reliably prevented.

  Further, since the construction machine can be transported with the step attached to the lower side frame, a complicated step attaching / detaching operation is not required. Furthermore, it is not necessary to transport the step separately from the machine body, and there is no possibility of losing the step during transportation.

  In the invention according to claim 2, since the step can be fastened and fixed to the lower side frame after moving to the upper mounting position or the lower mounting position without removing the step, in addition to the effect of claim 1, The step mounting position can be easily and quickly changed, and the positioning and fixing of the step can be performed securely and firmly.

  The present invention includes a lower frame on which an upper swing body is turnably mounted, a pair of lower side frames provided so as to be retractable inward in the vehicle width direction outside the lower frame, and the lower side frame And a step for raising and lowering attached to the lower side frame. The step is provided on the lower side frame so as to be selectively fixable at an upper mounting position or a lower mounting position, and when the lower mounting position is fixed. The step is formed so as not to protrude upward from the upper end of the lower side frame, thereby preventing mutual interference with the lower frame without detaching the step during the retracting operation of the lower side frame. And the object of eliminating the need to transport the steps separately from the aircraft was achieved.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a large construction machine provided with a crawler, and an upper swing body 4 is rotatable on a lower traveling body 2 of the hydraulic excavator 1 via a swing mechanism 3. It is mounted on. The upper swing body 4 is provided with a cabin 5 on one front side thereof, and a boom 6 is attached to the front center portion so as to be able to be lifted and swung. Further, an arm 7 is rotatably attached to the tip of the boom 6, and a bucket 8 is rotatably attached to the tip of the arm 7.

  As shown in FIG. 2, the lower traveling body 2 is disposed on a lower frame 10 having a cylindrical body 9 for placing an upper swing body on the upper side, and on the left outer side and the right outer side of the lower frame 10, respectively. The left lower side frame 11L and the right lower side frame 11R are reciprocally slidable so that the pair of left and right lower side frames 11L and 11R can move away from each other in the lateral direction of the vehicle width with respect to the lower frame 10. It is provided as possible.

  When the hydraulic excavator 1 is loaded on a truck and transported to a construction site, the lower side frames 11L and 11R are retracted inwardly in the vehicle width direction (retract movement), thereby connecting the lower side frames 11L and 11R. The width W is reduced to the minimum and transported. Then, after the hydraulic excavator 1 is transported to the construction site, the lower side frames 11L and 11R are moved outward (extended movement) when the hydraulic excavator 1 is lowered from the truck and the work is performed. Thus, the operation is performed with the width W between the lower side frames 11L and 11R being enlarged to the maximum. Therefore, the operation of the hydraulic excavator 1 is stabilized.

  Thus, each operation will be described with reference to an example shown in FIG. In the figure, the right lower side frame 11R is moved outward in the vehicle width direction and fixed to the widened position (extension position) by bolts 13, 13,. Although it is shown in a state in which it is moved inward in the width direction and fixed to a contracted position (storage position) by bolts 14, 14,..., It should not be limited to this, and the right lower side frame 11R is contracted. It is natural that the left lower side frame 11L can be used for widening, and both can be used simultaneously or individually for widening or shrinking.

  Here, when the left lower side frame 11L or the right lower side frame 11R is moved outward or inward in the vehicle width direction and fixed at the widened position or the contracted position, for example, the upper swing body 4 is moved to the left or Turn right approximately 90 degrees, and bring the bucket 8 into contact with the ground. Further, the boom cylinder is operated to receive a reaction force from the ground contact surface of the bucket 8, and the left lower side frame 11L or the right lower side frame 11R of the lower traveling body 2 is lifted from the ground. Next, in this floating state, the left lower side frame 11L or the right lower side frame 11R is widened by moving the left lower side frame 11L or the right lower side frame 11R in the widening direction or the narrowing direction with a crane or the like. It can be changed to a position or a reduced width position.

  Next, the step device according to the present invention will be described with reference to FIGS. In FIG. 3, step attachment portions 15 </ b> L are provided in the vicinity of both ends in the vehicle front-rear direction on the outer side surface of the left lower side frame 11 </ b> L. Similarly, step attachment portions 15R are provided in the vicinity of both ends in the vehicle front-rear direction on the outer surface of the right lower side frame 11R, and the left and right side step attachment portions 15L, 15R are provided on the left and right sides of the lower frame 10, respectively. And confront each other.

  As shown in FIG. 4, a pair of step fixing seats 16 for selectively fixing a later-described step 20 to an upper mounting position or a lower mounting position is provided at each of the four positions of the step mounting portions 15 </ b> L and 15 </ b> R. 16 is fixed. The pair of step fixing seats 16 and 16 are disposed at the same height so as to be opposed to each other in the vehicle front-rear direction and extend downward from the vicinity of the upper ends of the lower side frames 11L and 11R. Further, bolt holes 17, 18, and 19 are formed in the upper and lower portions of the step fixing seats 16, 16 with a constant interval D in a vertical line.

  The step 20 has two upper and lower leg rests 20a and 20a, and the surface of the leg rests 20a and 20a is provided with an uneven pattern for preventing slipping. In addition, although the step 20 is formed in a square shape in the illustrated example, it should not be limited to this, and may be formed in an arbitrary shape such as a ladder shape or a U-shape.

  A pair of bolt mounting portions 21, 21 extending in the vertical direction are connected to the lower half of each side of the step 20, and the bolt mounting portions 21, 21 are formed of a plate having a predetermined thickness. . The distance between the pair of bolt mounting portions 21 and 21 is the same as the distance between the pair of step fixing seats 16 and 16, and the bolt mounting portions 21 and 21 with respect to the step fixing seats 16 and 16. Is configured to be movable up and down. Furthermore, two bolts 22 and 23 are attached to the respective bolt mounting portions 21 and 21 with a space D in the vertical direction.

  Thus, after the bolts 22 and 23 are loosened, the bolt mounting portions 21 and 21 of each step 20 are moved to the upper mounting positions of the step fixing seats 16 and 16, and then the upper and middle positions are moved. By screwing the bolts 22 and 23 into the bolt holes 22 and 23, the step 20 can be fixed at the upper mounting position. In this state, the step 20 protrudes upward from the upper ends of the lower side frames 11L and 11R.

  Then, after the bolts 22 and 23 are loosened, the bolt mounting portions 21 and 21 of the step 20 are moved to the lower mounting positions of the step fixing seats 16 and 16, and then the middle and lower bolt holes are moved. By screwing the bolts 22 and 23 into the bolts 18 and 19, the step 20 can be fixed at the lower mounting position. In this state, as shown in FIGS. 6 and 7, the upper end portion of the step 20 is located slightly below the upper ends of the lower side frames 11L and 11R, so that the step from the lower side frames 11L and 11R is performed. 20 does not protrude upward.

  Thus, by moving the lower side frames 11L and 11R in the vehicle width direction in a state where the step 20 is fixed at the lower mounting position, the step 20 and the lower frame 10 are moved during the movement. Interference can be avoided. That is, in the state where it is fixed at the lower mounting position, since the step 20 does not protrude upward from the upper ends of the lower side frames 11L and 11R, even if the lower side frames 11L and 11R are moved to the lower frame 10 side, The step 20 does not interfere with the protruding portion of the lower frame 10 or the attachment part 10a.

  Further, when the hydraulic excavator 1 is transported, the step 20 can be transported while being attached to the lower side frames 11L and 11R, so that the operator is freed from complicated step attachment / detachment work. Further, the step 20 does not need to be transported separately from the excavator 1, and the step 20 is not lost during transport.

  When the excavator 1 is moved down from a truck or the like after the transportation, the step 20 is moved from the lower mounting position to the upper mounting position, and the step 20 is fixed to the upper mounting position. In this state, since the mounting height of the step 20 approaches the cabin 5 side by the distance D and is fixed at an optimum height, the operator can easily get on and off the cabin 5 from the step 20.

In the above embodiment, the step fixing seats 16 and 16 are respectively provided with three bolt holes 17, 18 and 19 so that the mounting position of the step 20 can be changed up and down and fixed. However, the number of the bolt holes should not be limited to this, and the same effect as described above can be expected even if the number of bolt holes is four or more. Moreover, in the said Example, although two bolts were each provided in each bolt mounting part 21 and 21, it should not be limited to this.

  Further, the step 20 can be attached to the step fixing seats 16 and 16 so as to be slidable up and down. For example, the bolt mounting portions 21 and 21 of the step 20 are provided with convex portions or concave portions extending in the vertical direction, and concave portions or convex portions that are slidably fitted to the convex portions or concave portions are provided on the step fixing seats 16 and 16. Can be formed. Such a configuration facilitates the mutual change operation of the upper mounting position and the lower mounting position in step 20.

  Furthermore, the present invention can also be applied to a construction machine equipped with a retract cylinder for enlarging / reducing the width W between the lower side frames 11L and 11R in the vehicle width direction. .

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. Side surface detail drawing of the lower traveling body which concerns on one embodiment of this invention. The top view of the lower traveling body of FIG. The front view which shows the state which fixed the step apparatus which concerns on this invention to the high-order attachment position. The side view of FIG. The front view which shows the state which fixed the step apparatus which concerns on this invention to the low-order attachment position. The side view of FIG.

Explanation of symbols

1 Excavator (construction machine)
2 Lower body
3 Turning mechanism 4 Upper turning body 5 Cabin 6 Boom 7 Arm 8 Bucket 9 Cylindrical body 10 Lower frame 11L Left lower side frame 11R Right lower side frame 13, 14 Bolt 15L Left step attachment 15R Right step attachment 16 Step fixing seat 17 , 18 Bolt hole 19 Bolt hole 20 Step

20a Footrest part 21 Bolt mounting part 22, 23 Bolt (fastening member)

Claims (2)

  A lower frame on which the upper-part turning body is turnably mounted, a pair of lower side frames provided outside the lower frame so as to be retractable inward in the vehicle width direction, and attached to the lower side frame In the construction machine provided with a step for raising and lowering, the step is provided on the lower side frame so as to be selectively fixable at an upper mounting position or a lower mounting position, and when the lower mounting position is fixed, the step Is constructed so as not to protrude upward from the upper end of the lower side frame. The step is provided on the lower side frame so as to be movable in the vertical direction, and has a fastening means for selectively fixing the step to an upper mounting position or a lower mounting position. The step device for raising and lowering the construction machine according to 1.

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