Construction machine

Abstract

To provide a construction machine equipped with a footrest that allows a position of a step member to be adjusted with a simple operation.SOLUTION: A footrest comprises: a shaft-shaped step member 25 with a circular cross section; a pair of right and left support arms 27 mounted on a floor in front of a driver's seat and having support holes 26 through which both ends of the step member are inserted and supported; and an operating portion rotating the step member around an axis while supported in the support holes. Both ends of the step member have two flat surfaces 25a, 25a parallel to each other, formed by cutting away outer peripheries of the circular cross sections in two places. An outline shape of the support hole is formed by partially overlapping circumferences of a plurality of circles (a first circle, a second circle, a third circle) each having a diameter corresponding to a diameter D of the circular cross section to be arranged in the fore-and-aft direction of the driver's seat, and connecting them via two parallel upper and lower straight lines so that circumferences of neighboring circles are overlapped. A distance L between the two upper and lower straight lines is greater than a distance W between the two flat surfaces and less than a diameter D of the circular cross section.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a construction machine, and more particularly to a construction machine equipped with a footrest on which an operator places his or her feet. [Background technology]

[0002] In the cabs of construction machinery such as pile drivers, cranes, and hydraulic excavators, a footrest is provided on the floor in front of the driver's seat, and an operator seated in the driver's seat can perform various operations with both feet on the footrest (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-90032 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because operators vary in leg length, relatively small operators have had the inconvenience of being unable to reach the tread members (tread surface members) or being unable to make sufficient contact with the soles of their feet when placing their feet on the footrest.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a construction machine equipped with a footrest that allows the position of the stepping member to be adjusted with a simple operation. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a construction machine comprising a lower traveling body, an upper rotating body rotatably mounted on the upper part of the lower traveling body, a working device mounted on the front part of the upper rotating body, and a cab mounted on the upper rotating body and having a driver's seat and a footrest on which an operator seated in the driver's seat can place his / her feet. The footrest comprises a shaft-shaped step member having a circular cross section, a pair of left and right support arms mounted on the floor in front of the driver's seat and having support holes formed therein for inserting and supporting both ends of the step member, and a support arm supporting the step member in a state where the step member is supported by the support holes. and an operating part that rotates the member around an axis, and each end of the foot member has two flat surfaces that are parallel to each other, each cut out from the outer periphery of the circular cross section in two places, and the contour shape of the support hole is such that the circumferences of multiple circles having a diameter corresponding to the diameter of the circular cross section are partially overlapping and arranged in the fore-and-aft direction of the driver's seat, and the circumferences of adjacent circles are connected via two parallel upper and lower straight lines, and the distance between the two upper and lower straight lines is greater than the distance between the two flat surfaces and smaller than the diameter of the circular cross section.

[0007] The operating portion is formed by fixing a pair of plate pieces having plate surfaces parallel to the flat portion to both left and right ends of the foot member, and the plate pieces have an axial protruding portion that protrudes axially from the axial end face of the foot member and a radial protruding portion that protrudes radially from the outer peripheral surface of the foot member, and when the plate surfaces are perpendicular to the floor surface of the floor, the radial protruding portion abuts against one side of the support arm to restrict the axial movement of the foot member.

[0008] Furthermore, the radial protrusion protrudes only from the outer peripheral surface of one radial side of the step member, and the step member is formed from a round pipe material. [Effects of the Invention]

[0009] In this construction machine, the footrest, located on the floor in front of the driver's seat, features a circular step with two parallel flat surfaces. The contours of the support holes supporting the step are arranged in the fore-and-aft direction of the driver's seat, with the circumferences of multiple circles, each with a diameter corresponding to the diameter of the circular cross section, partially overlapping each other. The contours are connected by two parallel lines, one above the other, so that the circumferences of adjacent circles are joined. This allows the user to select any of the multiple circles forming the contour to appropriately set the support position of the step. Furthermore, because the distance between the two lines is greater than the distance between the two flat surfaces and less than the diameter of the circular cross section, simply rotating the step so that the flat surfaces are parallel to the floor allows the step from its current position to the next. This allows for a construction machine equipped with a footrest that allows for easy adjustment of the step's position. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of a pile driver showing an example of an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 4 is a view taken along the line IV-IV in FIG. 2. [Figure 5] FIG. 5 is a view taken along arrows VV in FIG. 4. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 4. [Figure 7] FIG. [Figure 8] 10A and 10B are explanatory diagrams of the procedure for adjusting the position of the step member. [Figure 9] FIG. 10 is a view showing the footrest in use (second support position). [Figure 10] FIG. 10 is a view showing the footrest in use (third support position). [Figure 11] FIG. 10 is a view showing the footrest with the step member removed. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 11 show an example of an embodiment in which the present invention is applied to a pile driver, which is an example of construction machinery. As shown in Fig. 1, the pile driver 11 has an upper rotating body 13 rotatably mounted on top of a lower traveling body 12 equipped with crawlers, and pile driving equipment (not shown), such as a leader and an auger, is mounted on the front of the upper rotating body 13. In addition, an operator's cab 15 and an engine power unit 16 serving as a power unit are mounted on a frame 14 of the upper rotating body 13. Furthermore, stabilizing jacks 17 are mounted at four locations on the front, rear, left, and right of the upper rotating body 13, and a counterweight 18 for balancing the pile driver 11 is mounted on the rear end of the upper rotating body 13.

[0012] The cab 15 is mounted on the right or left side of the frame 14 depending on the specifications of the pile driver 11, and an access opening that can be opened and closed by a door 15a is provided on the outer surface of the upper rotating body in the width direction. In this embodiment, the cab 15 is mounted on the left side of the frame 14. The door 15a is of an outward-opening type that can be rotated around a hinge 15b attached to the rear side of the cab (the right side in FIG. 1) at the access opening. As shown in FIGS. 2 and 3, the cab 15 is provided with a driver's seat 20 in which an operator 19 sits, and devices such as operating levers and push button switches for driving the vehicle, swinging the vehicle, and raising and lowering and rotating the auger, as well as a touch panel monitor, are concentrated near the driver's seat 20 for ease of operability.

[0013] FIG. 3 is a plan view of the interior of the cab 15, with the left side representing the front, the right side representing the rear, the upper side representing the right side, and the lower side representing the left side. The driver's seat 20 can be fixed in a position in the fore-aft direction as appropriate using a known fore-aft position adjustment mechanism (slide mechanism). A hinge 15b, which is the pivot axis of the door 15a, is located directly to the side of the driver's seat 20, and rotating the door 15a approximately 180 degrees from the closed position widens the entrance / exit opening. Various operating systems can be easily operated from the driver's seat 20, and within the cab interior, a left-side operation input unit 21, which can be operated with the left hand, a right-side operation input unit 22, which can be operated with the right hand, and a front-side operation input unit 23, which can be operated with both hands or one hand, are located on the left side, right-side operation input unit 22, which can be operated with the right hand, and front-side operation input unit 23, which can be operated with both hands or one hand, are located on the front side.

[0014] The various operation input units 21, 22, 23 are provided with known operation levers 21a, 22a, 23a, 23b that can be tilted from a neutral position to a predetermined position. For example, by tilting the two left and right travel operation levers 23a, 23b that belong to the front operation input unit 23, the left and right crawlers can be used to travel in a straight line or turn. By tilting the turning / auger raising / lowering operation lever 21a that belongs to the left operation input unit 21, the upper turning body 13 can be turned left or right and the auger can be raised or lowered. By tilting the winch / auger rotation operation lever 22a that belongs to the right operation input unit 22, the winch can be wound up or lowered (rope winding / releasing) and the auger can be rotated forward or backward.

[0015] A footrest 24 is provided inside the cab 15 on which the operator 19 sitting in the driver's seat 20 places his or her feet. As shown in Figures 4 to 7, the footrest 24 has a shaft-shaped step member 25 with a circular cross section, a pair of left and right support arms 27, 27 that are provided on the floor 15c in front of the driver's seat 20 and have support holes 26 that support both ends of the step member 25, and an operating part 28 that rotates the step member 25 about its axis while it is supported in the support holes 26.

[0016] The step member 25 is formed from a round pipe (straight pipe) long enough for the operator 19 to place both feet on, and both end openings of the round pipe extending in the left-right direction of the driver's seat (left-right direction in FIG. 4) are closed by circular plates 29, 29. In this embodiment, as shown in FIG. 6, a thick round pipe with an outer diameter (diameter D of the circular cross section) of 30 mm is used. Both ends of the step member 25 serve as support points for the support arms 27, 27, and two parallel flat sections 25a, 25a are provided by removing two locations from the outer periphery of each circular cross section. As a result, the distance W between the two flat sections 25a, 25a is defined as the two-face width.

[0017] 4 and 5, the support arm 27 is a plate-like member formed by a mounting plate 27a bolted to the floor 15c via a bracket 30, and a support plate 27b arranged to extend horizontally from the mounting plate 27a toward (rear of) the driver's seat 20 (see also FIGS. 2 and 3). The support plates 27b, 27b arranged in pairs on the left and right face each other with their plate surfaces facing each other, and each has a support hole 26 formed at its tip.

[0018] As shown in Fig. 6, the support hole 26 is formed into an elongated hole shape by interconnected arcs and straight lines. The specific contour shape of the support hole 26 is such that the circumferences of multiple circles, each having a diameter corresponding to the shaft diameter of the step member 25, i.e., the diameter D of the circular cross section, are arranged in the fore-and-aft direction of the driver's seat (the left-and-right direction in Fig. 6) with some overlapping (dotted lines in Fig. 6), and are connected via two parallel straight lines above and below so that the circumferences of adjacent circles are connected. Here, as will be described in detail later, the number of circles forming the contour corresponds to the number of support positions (adjustment positions) of the step member 25.

[0019] In this exemplary embodiment, the centers C1, C2, and C3 of the three circles, namely the first circle, the second circle, and the third circle, are arranged at equal intervals (equal pitch) P in the longitudinal direction of the driver's seat, and the circumferences of adjacent circles are connected as the first circular arc 26a, the second circular arc 26b, and the third circular arc 26c. Between the first circular arc 26a and the second circular arc 26b, two upper and lower first-second circular arc straight lines 26d, 26d parallel to each other are provided, and between the second circular arc 26b and the third circular arc 26c, two upper and lower second-third circular arc straight lines 26e, 26e parallel to each other are respectively connected through them, forming a contour shape. Thereby, the stepping member 25 can be adjusted to three support positions, namely the first support position corresponding to the first circle, the second support position corresponding to the second circle, and the third support position corresponding to the third circle. Also, the interval P between each circle is, for example, 20 mm, and the interval between the center C1 of the first circle and the center C3 of the third circle is twice the pitch (2P), ensuring 40 mm. This 40 mm corresponds to the front-back position adjustment range (slide range) of the driver's seat 20.

[0020] Here, the distance L between the two upper and lower straight lines (between the two upper and lower first-second circular arc straight lines 26d, 26d and between the two upper and lower second-third circular arc straight lines 26e, 26e) is larger than the distance (two-plane width) W between the two flat surfaces 25a, 25a of the stepping member 25 and smaller than the diameter D of the circular cross-section. That is, when the distance between the two upper and lower straight lines in the support hole 26 is L, the distance between the two flat surfaces in the stepping member 25 is W, and the diameter of the circular cross-section is D, the relationship W < L < D is satisfied. In this exemplary embodiment, for example, W = 24 mm, L = 26 mm, and D = 30 mm. Here, the outer peripheral surface of the stepping member 25 and each of the circular arcs 26a, 26b, 26c abut against each other without play at each support position of the stepping member 25 corresponding to the three circles (showing the first support position in FIGS. 4 to 7), while manufacturing tolerances are provided so that the rotation (accompanied by sliding) of the stepping member 25 around its axis can be smoothly performed at that support position, resulting in a clearance relationship.

[0021] 4 and 5, the operating part 28 is made up of a pair of plate pieces having plate surfaces parallel to the flat surface 25a of the step member 25, which are fixed symmetrically to the left and right ends of the step member 25 in an arrangement passing through the central axis. The plate pieces have an axial protrusion 28a that protrudes in the axial direction from the axial end face of the step member 25 (the plate surface of the disk 29), and a radial protrusion 28b that protrudes in the radial direction from the outer peripheral surface of the step member 25 (see also FIG. 7).

[0022] The radial protrusion 28b protrudes only from the outer peripheral surface on one radial side of the step member 25, taking into consideration the ease of assembly of the step member 25. In other words, there is no protrusion on the outer peripheral surface on the opposite side (the other radial side). This allows the step member 25 to be inserted into or removed from the support hole 26 at any of the three support positions, with the plate surface held horizontally so that the entire operating portion 28 overlaps with the projection of the support hole 26. When installing or removing the step member 25, as can be seen in Figure 3, opening the door 15a ensures a working space for inserting or removing the step member 25 to the left or right of the driver's seat.

[0023] After inserting the step member 25 through the support hole 26, the pair of left and right support plates 27b, 27b of the operating unit 28 are positioned between the pair of left and right radial protrusions 28b, 28b with the plate surface perpendicular to the floor surface of the floor 15c, as shown in FIGS. 4 to 7. In this state, the outer peripheral surface of the step member 25 abuts against the first circular arc 26a of the support hole 26 (FIG. 6), thereby restricting movement of the step member 25 in the fore-and-aft direction of the driver's seat. At the same time, the radial protrusion 28b of the operating unit 28 abuts against the plate surface of the support plate 27b (one side of the support arm 27), thereby restricting movement of the step member 25 in the axial direction (left-right direction of the driver's seat). In this way, in the first support position, the position of the central axis of the step member 25 is aligned with the center C1 of the first circle of the support hole 26, and the central axis is held spaced above the floor 15c by, for example, approximately 100 mm.

[0024] Hereinafter, in the footrest 24, a position adjustment procedure when moving the stepping member 25 from the first support position to the second support position will be described while referring to FIG. 8. FIG. 8(a) shows the stepping member 25 in the first support position. Here, when the operation part 28 is rotated and the stepping member 25 is rotated counterclockwise by 90 degrees, and as shown in FIG. 8(b), when the plate surface of the operation part 28 is parallel (horizontal state) to the floor surface of the floor 15c, the flat parts 25a, 25a of the stepping member 25 provided parallel to the plate surface of the operation part 28 also become parallel (horizontal state) to the floor surface of the floor 15c. As a result, at both ends of the stepping member 25, the axial diameter D in the vertical direction is substantially reduced by the two-sided width W, and it becomes possible to pass between the first and second arc straight lines 26d, 26d that define the distance L of the support holes 26 (the W < L relationship in FIG. 6).

[0025] Here, the middle part in the axial direction of the stepping member 25 is gripped, and as shown in FIG. 8(c), the stepping member 25 is slid equally to the left and right forward. That is, the flat parts 25a, 25a of the stepping member 25 are moved along the first and second arc straight lines 26d, 26d. Then, as shown in FIG. 8(d), in a state where the position of the central axis of the stepping member 25 is made to coincide with the center C2 of the second circle, in other words, in a state where the flat parts 25a, 25a have passed between the first and second arc straight lines 26d, 26d, the operation part 28 is rotated and the stepping member 25 is rotated clockwise by 90 degrees, and as shown in FIG. 8(e), the flat parts 25a, 25a are made perpendicular to the floor surface of the floor 15c.

[0026] As a result, the outer peripheral surfaces of both ends of the stepping member 25 abut against the second arcs 26b, 26b of the support holes 26, the movement in the front-rear direction of the driver's seat is restricted (the L < D relationship in FIG. 6), and at the same time, the radially protruding part 28b of the operation part 28 abuts against the plate surface of the support plate 27b, and the movement in the axial direction (left-right direction of the driver's seat) is restricted (FIG. 4). In this way, the position of the stepping member 25 is determined at the second support position, and as shown in FIG. 9, even when the sole of the operator 19 abuts, it is stably held at that position.

[0027] Also, by following the same procedure as described above, as shown in FIG. 10, the stepping member 25 can be moved from the current support positions (first and second) to the third support position. As a result, the degree of freedom in the positional relationship between the driver's seat 20 and the footrest 24 becomes even higher, and comfortable habitability in the cab interior can be obtained regardless of the physical differences of the operator 19. Further, as shown in FIG. 11, it can also be used with the stepping member 25 removed. Therefore, in any usage mode of the footrest 24, the operator 19 seated on the driver's seat 20 can firmly brace both feet in a natural posture, enabling stable driving operations.

[0028] Thus, according to the construction machine of the present invention, in the footrest 24 provided on the floor 15c in front of the driver's seat 20, two flat portions 25a, 25a parallel to each other are provided on the stepping member 25 having a circular cross-section, and the contour shape of the support hole 26 that supports the stepping member 25 is formed by arranging in the front-rear direction of the driver's seat with a part of the circumferences of a plurality of circles having a diameter corresponding to the diameter D of the circular cross-section overlapping each other, and connecting them via two parallel upper and lower straight lines so that the circumferences of adjacent circles are continuous. Therefore, any one of the plurality of circles (first circle, second circle, third circle) forming the contour can be selected to appropriately set the support position of the stepping member 25. Moreover, since the distance L between the two upper and lower straight lines is larger than the distance W between the two flat portions and smaller than the diameter D of the circular cross-section (the relationship of W < L < D in FIG. 6), by simply rotating the stepping member 25 so that the flat portions 25a, 25a are parallel to the floor surface of the floor 15c, the stepping member 25 at the current position can be moved to the adjacent position. That is, a construction machine equipped with a footrest 24 capable of adjusting the position of the stepping member 25 with a simple operation can be realized.

[0029] Furthermore, because the operating portion 28 is made of a plate piece and has an axial protruding portion 28a and a radial protruding portion 28b, the step member 25 can be easily rotated despite its compact size, and the step member 25 can be reliably prevented from unintentionally falling out of the support position. Furthermore, because the radial protruding portion 28b protrudes only from the outer peripheral surface on one radial side of the step member 25, the assembly work (insertion and removal) of the step member 25 can be performed easily and quickly. In addition, because the step member 25 is formed from a round pipe material, the step member 25 can be made lightweight, thereby making the footrest 24 easier to handle.

[0030] The present invention is not limited to the above-described embodiment, and the shape and arrangement of the footrest can be modified as appropriate depending on the specifications of the construction machine. For example, by using symmetrical footrests, the same parts can be used regardless of whether the cab is mounted on the left or right side of the frame, thereby achieving part standardization. Furthermore, the support position of the footrests can be adjusted to suit the operator's physical characteristics and preferences, and the shape of the support holes and the arrangement of the circles forming their outlines can be freely selected. Furthermore, while a pile driver has been used as an example of a construction machine, the present invention is not limited to this, and can be applied to various construction machines equipped with an operator's cab, such as earth drills, cranes, and hydraulic excavators. In this case, the footrests are positioned so that they can be easily inserted and removed through the access door, making it easy to retrofit already-sold vehicles. [Explanation of symbols]

[0031] 11...pile driver, 12...undercarriage, 13...upper rotating body, 14...frame, 15...cab, 15a...door, 15b...hinge, 15c...floor, 16...engine power unit, 17...jack, 18...counterweight, 19...operator, 20...driver's seat, 21...left side operation input unit, 21a...swing / auger lifting operation lever, 22...right side operation input unit, 22a...winch / auger rotation operation lever, 23...front side Operation input unit, 23a, 23b...travel operation lever, 24...footrest, 25...tread member, 25a...flat portion, 26...support hole, 26a...first circular arc, 26b...second circular arc, 26c...third circular arc, 26d...straight line between first and second circular arcs, 26e...straight line between second and third circular arcs, 27...support arm, 27a...mounting plate, 27b...support plate, 28...operation unit, 28a...axial protrusion, 28b...radial protrusion, 29...disc, 30...bracket

Claims

1. a lower running body; an upper rotating body rotatably provided on an upper part of the lower traveling body; a working device provided at the front of the upper rotating body; a cab mounted on the upper rotating body and having a driver's seat and a footrest on which an operator seated in the driver's seat can place his / her feet; In a construction machine equipped with The footrest is a shaft-shaped tread member having a circular cross section; a pair of left and right support arms provided on the floor in front of the driver's seat and having support holes for inserting and supporting both ends of the foot members; an operating portion that rotates the tread member about an axis while the tread member is supported in the support hole, Each of the two end portions of the tread member has two parallel flat surfaces formed by cutting out two locations on the outer periphery of the circular cross section, The contour shape of the support hole is a contour shape in which a plurality of circles having diameters corresponding to the diameter of the circular cross section are arranged in the front-rear direction of the driver's seat with their circumferences partially overlapping, and the circumferences of adjacent circles are connected via two parallel lines, one above the other, so that the circumferences of the adjacent circles are connected, A construction machine characterized in that the distance between the two upper and lower straight lines is greater than the distance between the two flat surfaces and is smaller than the diameter of the circular cross section.

2. the operating portion is formed by fixing a pair of plate pieces having plate surfaces parallel to the flat portion to both left and right end portions of the foot member, 2. The construction machine according to claim 1, wherein the plate piece has an axial protruding portion that protrudes axially from the axial end surface of the tread member and a radial protruding portion that protrudes radially from the outer peripheral surface of the tread member, and when the plate surface is perpendicular to the floor surface of the floor, the radial protruding portion abuts against one side of the support arm to restrict axial movement of the tread member.

3. 3. The construction machine according to claim 2, wherein the radial protrusion protrudes from only one radially outer peripheral surface of the tread member.

4. 4. A construction machine according to claim 1, wherein the tread members are formed from round pipe material.

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