JP6626334B2 - Outrigger device, crawler crane provided with the same, ground member for outrigger device, shock absorber for outrigger device - Google Patents

Description

  The present invention relates to an outrigger device that protrudes laterally from a body of a work vehicle and supports the body.

As this type of work vehicle, for example, a crawler crane is known (for example, see Patent Document 1). The crawler crane disclosed in Patent Literature 1 has a crawler for traveling at a lower portion of the fuselage, and a crane stands upright at an upper portion of the fuselage. A plurality of outriggers are provided on the front, rear, left and right sides of the aircraft. The plurality of outriggers can protrude sideways with respect to the body, and a grounding member (hereinafter, referred to as a float) at the tip of each outrigger device is grounded to stabilize the body.
A small crawler crane as disclosed in Patent Document 1 has a compact storage posture in which the entire outrigger device is stored on the machine. As a result, the outrigger device does not protrude laterally from the machine body, so that even when the passage leading to the site is narrow, the vehicle can travel to the site by itself. Further, after arriving at the site, the outrigger device can be set to the deployed posture protruding sideways from the fuselage, and crane work can be performed in a state where high stability is secured.

JP 2009-121514 A (FIG. 3)

Here, in the above prior art, the float at the tip of each outrigger device is provided rotatably about a horizontal axis in order to increase the degree of freedom of grounding. Therefore, for example, when the vehicle travels on an unpaved road with the outrigger device stored, the float rotates due to vibration transmitted from the road surface. This rotation may cause the float to come into contact with other nearby components, and the sound generated by this contact has been one of the complaints for the operator.
Further, the inner box constituting the distal end arm of the above-described conventional outrigger device has, for example, two long metal members having a U-shaped cross section perpendicular to the longitudinal direction (cross section) and an opening having the same width. It is constituted by butting the members made in a square tube shape and joining the joint portion by welding. If the outrigger device having the inner box having such a configuration is configured to be able to contact the ground in a posture protruding to a horizontal position, there is a possibility that both ends of the float come into contact with the weld bead of the inner box and both are damaged. is there.

Therefore, the present invention has been made in view of such a problem, and generates sound due to vibration of an outrigger device and the like due to contact with other components of the float due to vibration of the outrigger device when the work vehicle travels on its own. It is a first object to provide an outrigger device capable of suppressing the occurrence of the outrigger.
It is a second object of the present invention to provide a float for an outrigger device that can prevent the float from coming into contact with a weld bead when the outrigger device is installed so as to project to a horizontal position.

In order to solve the above first problem, an outrigger device according to one aspect of the present invention has a retracted posture during non-working and a deployed posture during working, and has a tip that rotates around a horizontal axis. An outrigger device comprising a freely pivotally supported grounding member, further comprising a buffer provided on another component member approaching when the grounding member itself rotates, wherein the grounding member is in the storage position. In the above, the end closer to the buffer portion is pivotally supported so as to have a higher inclination posture than the end farther away.
Here, in the outrigger device according to one aspect of the present invention, it is preferable that the grounding member is pivotally supported such that the position of the center of gravity thereof is closer to an end portion farther than an axis pivotally supporting itself.

  Further, in the outrigger device according to one aspect of the present invention, a base end portion whose base end is rotatably supported at least around a horizontal axis on the fuselage side, and a base end provided at a tip end of the base end arm. A distal end arm pivotally supported so as to be rotatable about a horizontal axis, wherein the distal end arm includes a cylindrical outer box, and the outer box extends and contracts along a longitudinal direction of the outer box. An inner box fitted in the inner box, the grounding member and the buffer are provided at a tip end of the inner box, and the buffer covers a rod-shaped core member and both end portions of the core member. And a gripping portion formed of a shock-absorbing member.

Further, in the outrigger device according to one aspect of the present invention, it is preferable that the shock-absorbing portion is provided on a side opposite to the base-end-side arm across a shaft that pivotally supports the grounding member.
Further, in the outrigger device according to one aspect of the present invention, in the storage position, the distal end of the inner box faces upward from the central portion toward the proximal end toward the proximal arm. It is preferable to provide an inclined portion.
Further, in the outrigger device according to one aspect of the present invention, the inner box is formed by abutting two long metal members having a U-shaped cross section and the same opening width in a cylindrical shape to form a joint between the two metal members. The grounding member is provided at a position that overlaps with the joint portion of the inner box when the ground member is rotated to the inclined portion side in the width direction of the end portion facing the inclined portion side. It is preferable to have a notch.

Further, in order to solve the first problem, a crawler crane according to one aspect of the present invention includes a plurality of outrigger devices that support an airframe, and the plurality of outrigger devices are in a storage posture. A crawler crane that is stored at a position higher than the upper surface of the fuselage and, when in the deployed position, protrudes laterally from the fuselage and supports the fuselage; An outrigger device according to an aspect is provided.
According to another embodiment of the present invention, there is provided a grounding member for an outrigger device according to one aspect of the present invention, which has a retracted posture during non-operation and a deployed posture during operation, and has a proximal A base end arm whose part is rotatably supported about at least a horizontal axis, and a distal end arm whose base end is rotatably supported at a distal end of the base side arm so as to be rotatable about a horizontal axis. The distal end arm has a cylindrical outer box, and an inner box fitted in the outer box so as to be able to expand and contract along the longitudinal direction of the outer box, and the inner box is A grounding member for an outrigger device comprising two long metal members having a U-shaped cross section and the same opening width butted against each other in a cylindrical shape, and joining a seam portion thereof by welding. , Around the horizontal axis at the tip of the inner box Is rotatably pivoted, itself to the inclined portion in the width direction of the end facing the inclined portion has a cutout portion provided in a position overlapping the junction of the inner box when rotated.

According to the present invention, the cushioning portion is provided on the other component side approaching when the grounding member itself rotates, and the grounding member is located on the side farther than the end closer to the buffering portion in the storage posture. Is pivotally supported so that the end of the is tilted high. This makes it difficult for the grounding member to rotate to the side opposite to the buffer unit side, and also allows the shock due to the rotation of the grounding member to the buffer unit side to be buffered in the buffer unit. As a result, it is possible to suppress the generation of sound due to contact with other constituent members when the ground member rotates due to vibration or the like.
Further, in the width direction of the end portion facing the inclined portion side of the tip of the inner box in the storage position, the notch portion is provided at a position overlapping with the welded joint portion of the inner box when the ground member is turned to the inclined portion side. Configuration. Thus, for example, when the outrigger device is extended to the horizontal position and the ground member is grounded, it is possible to avoid the ground member from contacting the weld bead formed at the weld joint.

It is a right view of the crawler crane which is one embodiment of the work vehicle concerning the present invention. FIG. 1 shows a state in which the outrigger device is stored on the body. It is a side view which shows the storage posture of an outrigger device. It is a side view which shows the deployment posture of an outrigger device. FIG. 3 is an enlarged view of part A of FIG. 2 ((a)) and a right side view ((b)) of FIG. (A) is a front view of the float, (b) is a left side view of the same figure (a), (c) is a plan view of the same figure (a), and (d) is a back side of the same figure (a). FIG. (A) is an operation explanatory diagram of the float, and (b) is an operation explanatory diagram of the inner box. (A) is a diagram showing a horizontal grounding state when the inner box is retracted, (b) is a diagram showing a horizontal grounding state when the inner box is pulled out one step, and (c) is a diagram showing the horizontal grounding state. FIG. 2B is a right side view, and FIG. 2D is a sectional view taken along line AA of FIG. (A) is a figure which shows the state in which the front-end | tip arm was located horizontally at the time of the inner box of the conventional outrigger device at the time of the most storage, (b) was pulling out the inner box of the conventional outrigger device by one stage. It is a figure showing the horizontal grounding state of a state. It is a figure corresponding to the AA section of Drawing 7 (b) when notch portions are not provided in a float.

  Hereinafter, a crawler crane, which is an embodiment of a work vehicle including an outrigger device according to the present invention, will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the drawings include portions having different dimensional relationships and ratios. The embodiments described below exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material, shape, structure, and arrangement of component parts. Are not specified in the following embodiments.

(Constitution)
As shown in FIG. 1, the crawler crane 1 is a small crawler crane that travels without an operator on the body 2. At the rear of the body 2, a control unit 4 for an operator to operate while standing is provided at an operation position during driving (the position on the left side in the figure). A pair of left and right traveling operation levers 50 project obliquely upward from the control unit 4 toward the side where the operator stands. In the center of the fuselage 2 in front of the control unit 4, a driving unit 5 including an engine, a pressure oil supply device, and the like and a control unit (not shown) are provided. Further, a crawler device 3 is provided below the body 2.

The crawler device 3 has, for example, rubber crawler belts mounted on the left and right sides of the body 2. The pressure oil supply device of the driving unit 5 has two traveling hydraulic motors respectively corresponding to the left and right crawler belts, and the left and right crawler belts can be individually driven by two left and right hydraulic circuits. I have.
Thereby, the crawler crane 1 drives the crawler device 3 at the lower part of the body 2 by operating the pressure oil supply device of the driving unit 5 and simultaneously operating the pair of left and right traveling operation levers 50 forward or backward. The vehicle can travel in a forward or backward direction at a vehicle speed about the walking speed of a person. Further, when the body 2 having the crawler device 3 turns right or left, the corresponding left and right crawler belts can be individually driven by individually advancing or retreating the pair of left and right traveling operation levers 50. Turning is possible with a speed difference.

  Further, as shown in FIG. 1, the crawler crane 1 has a crane device 6 having a boom 7 and a winch (not shown) and a plurality of outrigger devices 10 mounted on a body (body) 2. The crawler crane 1 includes a traveling-crane changeover switch (not shown) for switching between a traveling mode and a crane mode, and a crane device 6 in a crane mode. A crane operation-outrigger operation switch (not shown) for switching between a crane operation mode for enabling operation and an outrigger operation mode for enabling operation of the outrigger device 10 is provided. , The outrigger device 10 and the crane device 6 cannot be operated simultaneously for safety. Even if a remote controller is used, the switching operation of each mode can be similarly performed.

  Here, a total of four outrigger devices 10 are arranged on each of the right and left ends of the front and rear of the fuselage 2, and the positions of the constituent members relatively moving around the support shaft are manually restrained and released by the operator. , And a deployed posture shown in FIG. 3. In the crawler crane 1, when the crane device 6 is used, the operator manually extends each outrigger device 10 to the side of the body 2, and then drives the telescopic hydraulic cylinder 11 to ground each outrigger device 10 and deploy it. The posture ensures the stability of the body 2. After that, the boom 7 of the crane device 6 is turned, raised and lowered, extended and contracted, and a hoist (not shown) of the crane device 6 can lift and lower the suspended load.

Hereinafter, the outrigger device 10 will be described in detail. Since all four outrigger devices 10 have the same configuration, they will be described below without particular distinction.
As shown in the outrigger device 10 on the left side of FIG. 1, the outrigger device 10 includes a base bracket 12 mounted on the upper surface of the body 2. On the base end side of the base bracket 12, a cylindrical rotation support portion 14 is provided. The rotation support portion 14 is pivotally supported about a vertical axis provided on the upper surface of the body 2, the operator removes the insertable / removable fixing pin 14 p by hand, and pivots the outrigger device 10 in the horizontal direction by hand. By doing so, the entire outrigger device 10 can be turned to the overhang position toward the side of the body 2.

At the overhang position, the fixing pin 14p is inserted into the overhang position fixing hole (not shown) so that the overhang position of the outrigger device 10 is securely fixed. In other words, the outrigger device 10 is provided at a projecting position where the four outrigger devices 10 are horizontally rotated by hand by an operator from the storage posture shown in FIGS. It is constituted so that it may be located at.
As shown in FIG. 2, the outrigger device 10 has a base bracket 12 in which a plate-shaped bracket portion 13 is formed integrally with the rotation support portion 14. A base end of the end arm 15 is pivotally supported so as to be rotatable around a horizontal axis. A plate-shaped center bracket 16 is fixed to the distal end of the proximal arm 15 integrally with the distal end of the proximal arm 15.

Further, both ends of the telescopic hydraulic cylinder 11 are pivotally supported by a mounting arm 16a of the center bracket 16 and a mounting arm 13a provided on the bracket portion 13 of the base bracket 12 so as to be rotatable around a horizontal axis. ing. By extending and retracting the hydraulic cylinder 11 for extension and contraction, the outrigger device 10 can be extended when the ground contact is made, and can be accommodated when the outrigger device 10 is retracted.
In the outrigger device 10, a distal arm 18 is pivotally supported at the distal end of the center bracket 16 so that the proximal end thereof can rotate around a horizontal axis. Further, between the proximal side surface of the proximal arm 15 and the proximal side surface of the distal arm 18, the respective side surfaces of the telescopic gas spring 17 are connected to each other so as to connect with each other. And pivotably supported about a horizontal axis.

As shown in FIG. 2, in the retracted position, the telescopic hydraulic cylinder 11 is at the minimum contraction position, and the telescopic hydraulic cylinder 11, the proximal arm 15, the telescopic gas spring 17, and the distal arm 18 are Each of them has a posture substantially in the vertical direction, and when stored in the upper part of the fuselage 2, the entire outrigger device 10 does not protrude laterally from the fuselage 2 and fits compactly.
The distal arm 18 has a rectangular outer box 19 and an inner box 20 fitted in the outer box 19 so as to be extendable and contractable along the longitudinal direction of the outer box 19. A substantially U-shaped first handle 23 gripped by an operator is provided on a side surface of the outer box 19 facing the outside. At the tip of the inner box 20, a float 21 is pivotally supported so as to be rotatable around a horizontal axis.

Here, the outrigger device 10 is provided with two posture holding pins 41 and 31 on the side surface of the center bracket 16 and the side surface of the outer box 19 for restraining and releasing a position corresponding to the deployed posture and the stored posture. ing.
In addition, a pair of protective plates 65 for a position corresponding to the storage posture and a pair of protection plates for a position corresponding to the unfolded posture are provided on both side surfaces of the center bracket 16 which are the outermost surfaces of the center bracket 16 and the outer box 19. The protection plate 61 is mounted. The protection plate 65 and the protection plate 61 are formed of a resin material having self-lubricating properties.

Further, in the present embodiment, as shown in FIGS. 4A and 4B, the outer box 19 and the outermost outer surfaces of the inner box 20 correspond to the unfolded posture and the stored posture due to the sliding movement of the inner box 20. A pair of protection plates 71 are mounted on both side surfaces of the outer box 19 in common with the deployed posture and the stored posture. The protection plate 71 is an annular plate member, and is formed of a resin material having self-lubricating properties.
In addition to the function as a handle for pulling out the inner box 20, the outrigger device 10 is provided on the opposite side of the tip of the inner box 20 on which the float 21 is pivotally supported. A dumbbell-shaped second handle 24 having a function as a buffer member for buffering an impact caused by the contact of the dumbbell is provided.

  Here, as shown in FIGS. 4A and 4B, the inner box 20 of the present embodiment has a main body 20a and a distal end 20b. The main body 20a is formed by joining two long metal (for example, high-tensile steel) members having a U-shaped cross section in a rectangular tube shape and joining the joints by welding. I have. This seam portion is present on the surface on the side facing the proximal end arm 15 and the surface on the opposite side in the retracted posture, and appears as a weld bead by being joined by welding. In the present embodiment, the upper and lower surfaces of the two metal members in the width direction of the opening have the same length, and the welding bead is located at the center passing through the middle point in the width direction of the inner box 20. Appear on the line.

The distal end portion 20b has a plate-shaped cover 20c that covers an opening on the distal end side of the main body portion 20a, and a float connection portion 20d that protrudes from an outer end surface of the cover 20c.
Also, as shown in the front view of FIG. 4 (a), the main body 20a of the inner box 20 avoids contact with the float 21 at the left side end of the front opening based on this front view. 20g is provided. Specifically, the inclined portion 20g has an inclination that is upward from the center of the distal end opening of the main body 20a toward the left side surface.
Further, in accordance with the inclination of the inclined portion 20g, the cover 20c is provided with an inclined portion 20h having a shape along the inclination of the inclined portion 20g at an end on the left side. The cover 20c is joined to the main body 20a by welding.

As shown in FIGS. 4A and 4B, the float connection portion 20d includes two plate-like members 20e and 20f. The float connecting portion 20d is configured by joining these plate-like members 20e and 20f by welding to an outer end surface of the cover 20c in a state where the plate-like members 20e and 20f face each other in plane symmetry with a predetermined interval. .
Here, the plate-shaped members 20e and 20f have a shape in which the upper end, which is the end on the joining side, conforms to the shape of the cover 20c with reference to the front view of FIG. Further, a lower end portion with respect to the upper end portion, which is a front end of the inner box 20, is moved from a right end side which is a side end facing the inclined portion 20h side to a left end side which is a side end portion on the inclined portion 20h side. An oblique side is formed which is inclined obliquely downward toward the bottom, and the lower end portion has an inverted triangular shape with an acute angle.

Further, the plate-like members 20e and 20f are provided with through holes (not shown) serving as shaft holes of a rotation shaft for pivotally supporting the float 21 at lower ends.
With this configuration, as shown in FIG. 4A, the second center line CL2 passing through the axis of the rotation shaft of the float 21 passes through the center of the opening of the main body 20a in the height direction. It is arranged at a position substantially directly below the inclined portion 20h from the first center line CL1. That is, in the present embodiment, the axial position of the rotation shaft of the float 21 is configured to be located on the left end side with respect to the center position in the width direction of the inner box 20.

On the other hand, as shown in FIG. 4 (b), the second handle 24 includes a cylindrical metal core member 24a and a bottomed cylindrical buffer member (for example, rubber) that covers both ends of the core member 24a. Gripping portions 24b and 24c formed of a member that absorbs shocks such as the above.
The core member 24a is joined by welding in such a manner that the exposed central portion is positioned on the oblique sides of the lower ends of the plate members 20e and 20f in a direction in which the longitudinal direction of the core member 24a and the longitudinal direction of the oblique sides are orthogonal. ing. Here, the second handle 24 of the present embodiment is configured such that its length in the longitudinal direction is substantially the same as the width of the lower end of the outer box 19 in the same direction, so that it fits within the width of the lower end. Are joined.

Similarly, the width direction orthogonal to the longitudinal direction of the float 21 is also substantially the same size as the width of the second handle 24 and the lower end of the outer box 19 in the same direction.
In the present embodiment, the second handle 24 is substantially the same height as the height position of the rotation axis of the float 21 on the oblique sides of the lower ends of the plate members 20e and 20f in the storage position of the outrigger device 10. It is joined at the position that will be the position. Specifically, the grips 24b and 24c are joined to a position where an operator can secure a space between the cover 20c and the grips 24b and 24c from above.

  Here, in the present embodiment, as shown in FIG. 3, as the position corresponding to the storage posture, the posture holding hole 20 k formed at the lowest position near the tip of the inner box 20 among the four posture holding holes. Are used as posture holding holes corresponding to the storage posture. The posture holding hole 20k is also used as a posture holding hole corresponding to the minimum overhanging posture S shown in FIG. As the deployment posture by sliding the inner box 20 with respect to the outer box 19, four postures including the posture holding hole 20k can be set, and the four postures are formed at the highest position of the inner box 20. The formed upper posture holding hole 20u is formed at a position corresponding to the maximum overhang posture U shown in FIG.

In addition, among the four deployed postures, intermediate posture holding holes 20s and 20m formed at a position between the upper posture holding hole 20u and the lower posture holding hole 20k of the inner box 20 are shown in FIG. It is formed at a position corresponding to the middle overhang posture M.
Then, in the inner box 20 having the above configuration, when the operator slides the inner box 20 from the storage position to any one of the four deployed positions by manual operation, the second handle 24 is moved. It is possible to hold it.
Further, as shown in FIGS. 5A to 5D, the float 21 has a substantially rectangular shape in plan view, and both ends of the plate surface are warped obliquely upward in a line symmetrical manner in front view. 21a, a substantially equilateral triangular connection plate 21b provided upright on the non-ground surface side which is the upper surface of the ground plate 21a, and a through hole 21c provided at the center of the upper end side of the connection plate 21b. A substantially U-shaped notch 21d is provided at the center in the width direction of one end of the main plate 21a in the longitudinal direction.

In this embodiment, since the position of the weld bead of the inner box 20 appears on the center line passing through the middle point in the width direction of the inner box 20, the notch 21d of the float 21 is provided at the center position in the width direction. When the position of the weld bead is shifted from the center line, the position of the notch 21d is also shifted from the center position in accordance with the shifted position. For example, when two metal members constituting the main body portion 20a of the inner box 20 have different lengths of abutting sides, the position of the weld bead is shifted from the center line.
The connection plate 21b has a lower end joined to the non-contact surface of the ground plate 21a by welding in a posture in which the longitudinal direction of the connection plate 21b and the longitudinal direction of the ground plate 21a match.

Specifically, the joining position of the connection plate 21b in the longitudinal direction of the ground plate 21a is, as shown in FIG. 5A, relative to the position of the third center line CL3 passing through the center of the longitudinal width of the ground plate 21a. Thus, the position of the fourth center line CL4 passing through the center of the longitudinal width of the connection plate 21b is shifted by a predetermined distance in the direction opposite to the position of the notch 21d.
Here, the connection plate 21b of this embodiment has a symmetrical shape as shown in FIGS. 5 (a) to 5 (d). Therefore, in the connection plate 21b alone, the center of gravity in the case where the position of the through hole 21c is set as the support position is the center position in the longitudinal direction. On the other hand, the ground plate 21a of the present embodiment is symmetrical when there is no notch 21d, but is not symmetrical because it has the notch 21d. Therefore, when the ground plate 21a alone is supported at the center position in the longitudinal direction, the position of the center of gravity is shifted from the center position in the longitudinal direction to the side opposite to the notch 21d.

For this reason, when the connection plate 21b is joined to the upper surface of the ground plate 21a so that their center positions in the longitudinal direction coincide with each other, the position of the center of gravity of the float 21 is shifted from the support position to the side opposite to the notch 21d. Thus, in the retracted position, the float 21 is supported (pivoted) at an end on the side of the notch 21d with a higher inclination than the end on the opposite side to the notch 21d.
In the present embodiment, when the position of the through hole 21c is set as the support position, the ground plate 21a and the connection plate 21b are positioned such that the center of gravity of the ground plate 21a is closer to the notch 21d than the center of gravity of the connection plate 21b. Are joined in a positional relationship.

Therefore, in the present embodiment, the predetermined distance is set to a distance that shifts the position of the center of gravity toward the notch 21d when there is no notch 21d in consideration of the shift of the center of gravity due to the notch 21d. The distance is set to the sum of the amount of deviation due to the notch 21d.
With this configuration, as shown in the front view of FIG. 4A, in the retracted posture of the outrigger device 10, the float 21 has an end near the second handle 24 (an end opposite to the notch 21 d). (End) is pivotally supported in an inclined posture in which it is higher than an end on the far side (end on the side of the notch 21d).

(Operation and effect)
Next, an operation and an effect of the crawler crane 1 including the outrigger device 10 will be described.
In the crawler crane 1, when the outrigger device 10 is in the retracted attitude, for example, when traveling on an unpaved road surface, the float 21 rotates (swings) around a horizontal rotation axis due to vibration transmitted from the road surface. I do. At this time, the float 21 rotates in both the direction of the position of the second handle 24 and the opposite direction depending on the direction in which the vibration is transmitted. Since the second handle 24 is pivotally supported in a previously rotated posture, it is difficult to rotate to the side opposite to the position of the second handle 24.

In addition, as shown in FIG. 6A, when the float 21 is turned to the second handle 24 side by vibration, for example, the upper end of the float 21 is formed of a buffer member such as rubber of the second handle 24. It is possible to buffer (absorb) the impact due to the contact because it comes into contact with the gripping portions 24b and 24c. Thereby, it is possible to prevent the float 21 from directly contacting the inner box 20 and to suppress the generation of sound due to the rotation of the float 21.
On the other hand, when working with the crawler crane 1, the operator manually grasps the distal arm 18 by the reaction force of the expansion / contraction gas spring 17 of each outrigger device 10 at the overhanging position and grasps the first handle 23. The center bracket 16 and the outer box 19 are coaxially penetrated through the center bracket 16 and the outer box 19 at a predetermined deployment position intended by the operator, and the upper posture holding pin 41 is inserted into the posture holding hole. As a result, the positions of the center bracket 16 and the outer box 19 are constrained to each other, and the deployed position of the distal arm 18 is maintained.

Further, as shown in FIG. 6B, the operator manually pulls out the inner box 20 of each outrigger device 10 by holding the second handle 24 from above, and at a predetermined pulling position intended by the operator, The lower posture holding pin 31 is inserted into the posture holding hole so as to penetrate the outer box 19 and the inner box 20 coaxially. As a result, the positions of the outer box 19 and the inner box 20 are restrained with respect to each other, and the pulled-out position of the inner box 20 is maintained.
As described above, since the inner box 20 can be pulled out by gripping the second handle 24, the main body 20a and the float 21 of the inner box 20 can be directly grasped by hand without the second handle 24. Can be easily grasped and the inner box 20 can be easily pulled out as compared with a configuration in which the inner box 20 is pulled out.

In addition, since it is possible to grip and pull out the grip portions 24b and 24c formed by the cushioning member, for example, when working with bare hands, it is necessary to perform the pull-out operation without directly grasping the metal portion by hand. Becomes possible. This makes it possible to lower the temperature conductivity with a soft touch as compared with a metal, so that it is possible to make it difficult for the operator's hand to be damaged, for example, in a low-temperature environment or a high-temperature environment.
Subsequently, the operator drives the telescopic hydraulic cylinder 11 of each outrigger device 10 to ground the float 21 provided at the lower part of the inner box 20 to the ground GL as shown in FIG. The operator lifts the fuselage 2 to a desired height with each outrigger device 10, stabilizes the fuselage 2, and secures the same lifting performance all around.

In this way, the operator, after installing each outrigger device 10 in a desired deployed state, turns, raises and lowers and expands and contracts the boom 7 of the crane device 6, and also appropriately raises and lowers the suspended load by the winch. A desired crane operation can be performed. When the crawler crane 1 is moved, the operator puts each outrigger device 10 from the deployed position to the retracted position and stores the entire outrigger device 10 on the upper part of the body 2. Therefore, the description is omitted.
In addition, in the crawler crane 1 of the present embodiment, since the inner box 20 has the above-described configuration, as shown in FIGS. 7A to 7C, the state in which the distal end arm 18 of the outrigger device 10 is horizontally extended. With this, the float 21 can be grounded horizontally.

For example, as shown in the conventional example of FIGS. 8A and 8B, the front end of the main body 120a of the inner box 120 and the cover 120c of the front end 120b are provided with inclined portions corresponding to the inclined portions 20g and 20h of the present embodiment. If the distance between the support position of the float 121 and the tip of the main body 120a and the cover 120c is shorter than that of the inner box 20 of the present embodiment, the float 121 is turned to the horizontal position. During the movement, the connection plate 121b comes into contact with the corner at the tip of the inner box 20.
On the other hand, in the inner box 20 of the present embodiment, the inclined portions 20g and 20h are provided on the front end of the main body portion 20a and the cover 20c of the front end portion 20b. FIGS. 8A and 8B show a configuration in which the box 20 is located on the left end side (substantially directly below the inclined portion 20 h) of the center position in the width direction of the box 20, and the inclined portion 20 h extends in the longitudinal direction of the inner box 20. It was configured to be located at a position more distant than the conventional example shown in b).

With this configuration, it is possible to prevent the connection plate 21b from coming into contact with the inner box 20 due to the rotation of the float 21, and to increase the rotation range so that the float 21 can be rotated to a position where horizontal grounding is possible.
Here, the inclination angles of the inclined portions 20g and 20h, and the distance between the inclined portion 20h and the support position of the float 21 are within a range where contact with the inclined portion 20h of the float 21 can be avoided and the strength of the tip portion 20b of the inner box 20. It is designed in consideration of.
For example, if the position of the axis of the rotation axis of the float 21 in the width direction of the inner box 20 is left as it is, the dimensions of the plate members 20e and 20f are increased without providing the inclined portions 20g and 20h to the support position. Can be rotated to a horizontal position by increasing the distance between the two. However, in consideration of the strength and the like of the distal end portion 20b, the distance to the support position should be as short as possible. Therefore, in the present embodiment, the distance to the support position is reduced by providing the inclined portions 20g and 20h.

In addition, the crawler crane 1 of the present embodiment has a notch at the center in the width direction (a position overlapping with the welding bead) of the end of the ground plate 21a constituting the float 21 on the side turning to the inclined portions 20g and 20h. 21d is provided. Thereby, as shown in the cross-sectional view of FIG. 7D, when the distal end arm 18 extends to the horizontal position, the contact between the float 21 and the welding bead 90 due to the rotation of the float 21 to the horizontal grounding position, The notch 21d can avoid this.
For example, as shown in the cross-sectional view of FIG. 9, when the notch 21 d is not provided in the float 21, the tip of the ground plate 21 a of the float 21 may come into contact with the welding bead 90 and the tip may be damaged. .

In addition, when the float 21 is attached to the inner box 20, the cutout portion 20 d also serves as a mark for an operator to prevent the float 21 from being attached in a wrong direction in the attaching direction.
As described above, according to the crawler crane 1 including the outrigger device 10, when the float 21 rotates due to vibration during traveling or the like, the float 21 is in contact with other components such as the inner box 20. It is possible to suppress generation of sound.
Further, when the outrigger device 10 is extended to the horizontal position and the float 21 is horizontally grounded, it is possible to avoid the float 21 from contacting the weld bead formed in the inner box 20 by the notch 21d. As a result, it is possible to prevent the float 21 from being damaged by contact with the weld bead.

(Modification)
Note that the outrigger device according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
(1) In the above-described embodiment, the float 21 is pivotally supported in the inclined posture rotated toward the second handle 21 in the retracted posture by shifting the center of gravity of the float 21, but is not limited to this configuration. Absent. For example, a weight having one end is provided by providing a weight at the end of the float 21 so as to have an inclined posture, or a spring having an elastic force in a range that does not hinder the turning operation of the float 21 at the time of grounding. Other configurations may be adopted, such as a configuration in which the members are inclined.
(2) In the above embodiment, a crawler crane has been described as an example of a work vehicle equipped with the outrigger device according to the present invention. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be applied to various work vehicles as long as the work vehicle is equipped with an outrigger device having a specification of restraining and releasing the work vehicle.

1 Crawler crane (work vehicle)
2 Body 3 Crawler device 4 Steering unit 5 Drive unit 6 Crane device 7 Boom 10 Outrigger device 11 Telescopic hydraulic cylinder 12 Base bracket 13 Bracket unit 14 Rotation support unit 15 Base end arm 16 Center bracket 17 Gas spring 18 for expansion and contraction Side arm 19 Outer box 19s Outermost surface of outer box 20 Inner box 20a Main body 20b Tip 20c Cover 20d Float connection 20e Plate 20f Plate 20g Incline 20h Incline 21 Float (ground member)
21a Ground plate 21b Connection plate 21d Notch 24 Second handle 24a Core member 24b Gripping portion 24c Gripping portion 50 Traveling operation lever 90 Weld bead

Claims (8)

An outrigger device having a stowed posture during non-working and a deployed posture during work, and having a grounding member pivotally supported at a distal end portion so as to be rotatable around a horizontal axis,
A buffer provided on the other component side approaching when the grounding member itself rotates ,
A base arm having a base end pivotally supported at least about a horizontal axis on the fuselage side, and a base end pivotably supported at a distal end of the base arm such that the base end is rotatable about a horizontal axis; With the tip side arm ,
The distal arm has a cylindrical outer box and an inner box fitted in the outer box so as to be extendable and contractable along the longitudinal direction of the outer box,
The grounding member and the buffer are provided at a tip of the inner box,
The buffer portion includes a rod-shaped core member and a grip portion formed of a buffer member that covers both ends of the core member,
The outrigger device, wherein the grounding member is pivotally supported such that, in the storage position, an end closer to the buffer unit has a higher inclination position than an end farther away.   The grounding member is formed such that a rotation center of a shaft pivotally supporting itself and a center in a longitudinal direction of the shaft orthogonal to the axis of the shaft are shifted by a predetermined distance, and a position of a center of gravity of the grounding member is The outrigger device according to claim 1, wherein the outrigger device is eccentric in a center direction in the longitudinal direction corresponding to the shift of the predetermined distance with respect to a shaft pivotally supporting itself. The buffer unit, outrigger device according to claim 1 or 2 is provided on the opposite side from the base end arm across the shaft pivotally supporting the grounding member. The outrigger device according to claim 3 , wherein an inclined portion is provided at an end of the distal end portion of the inner box facing the base end arm side in the storage position, the inclined portion being upward from a central portion toward the end portion. . The inner box is formed by abutting two long metal members having a U-shaped cross section and the same opening width in a cylindrical shape, and joining a joint portion thereof by welding,
The grounding member to claim 4 having the notches provided at the junction with the overlapping position of the inner box when itself to the inclined portion in the width direction of the end facing the inclined portion is pivoted An outrigger device according to any one of the preceding claims. It has a plurality of outrigger devices that support the fuselage, and the plurality of outrigger devices are stored at a position higher than the upper surface of the fuselage when in the retracted posture, and are laterally separated from the fuselage when in the deployed posture. A crawler crane overhanging and supporting the aircraft,
A crawler crane comprising the outrigger device according to any one of claims 1 to 5 , as the plurality of outrigger devices. A base arm having a retracted posture during non-work and a deployed posture during work, and having a base end pivotally supported at least on a horizontal axis on the fuselage side, and a distal end of the base end arm A distal end arm whose base end is pivotally supported so as to be rotatable around a horizontal axis, wherein the distal end arm is extendable and contractible along a cylindrical outer box and a longitudinal direction of the outer box. And an inner box fitted in the outer box, and the inner box is formed by abutting two long metal members having a U-shaped cross section and the same opening width in a cylindrical shape. A grounding member for an outrigger device configured by joining seams by welding,
The tip of the inner box is pivotally supported so as to be rotatable around a horizontal axis, and the joint of the inner box when itself turns to the inclined portion side in the width direction of the end portion facing the inclined portion side. A grounding member for an outrigger device, comprising a notch provided at an overlapping position. It has a retracted posture during non-work and a deployed posture during work, and has a horizontal shaft at the tip of the inner box fitted in the outer box so as to be able to expand and contract along the longitudinal direction of the cylindrical outer box. A buffer portion for an outrigger device including a ground member pivotally supported so as to be rotatable around,
The grounding member itself is provided on the other component side approaching when rotating, and is constituted by a rod-shaped core member and a grip portion made of a cushioning member covering both ends of the core member. Characteristic buffer part for outrigger device.

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