JP2000007282A - Wheel crane - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To solve a conventional problem that occurs when an outrigger is rotatably attached to a vehicle body. It is another object of the present invention to provide a wheel crane that does not interfere with the rotation of the revolving body, does not inadvertently rotate the revolving body when the revolving body turns, and does not cause undesired bending of the jack. A wheel crane (1) according to the present invention includes an outrigger (26) rotatably mounted on a body frame (10A) and rotating around a support shaft (30) located near a swivel bearing (12). A tip portion that is pivoted between a storage position where it is stored along the longitudinal direction of the vehicle body and a projecting position that protrudes to the side of the vehicle body, and protrudes from a longitudinal end of the vehicle body in the storage position. Is located within the width of the vehicle body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel crane having a dual-purpose cab that can be used for both crane work and vehicle operation.

[0002]

2. Description of the Related Art A wheel crane is configured such that a revolving body having a dual-purpose driver's cab and a telescopic boom capable of performing both operations of a crane and a vehicle is rotatably mounted on a traveling vehicle body. Such self-propelled cranes such as wheel cranes are provided with outriggers that support the vehicle body during work such as crane work and prevent the vehicle body from tipping over.

The outrigger is generally provided with a storage box as an outer cylinder installed on a body frame, a horizontal support leg (hereinafter referred to as a telescopic beam) as an inner cylinder housed in the storage box so as to be able to protrude and retract. A vertical support leg (hereinafter, referred to as a jack) is provided at the tip of the telescopic beam and extends vertically below the telescopic beam, and a float as a ground plate attached to the lower end of the jack is provided. The outrigger extends the telescopic beam horizontally from the storage box toward the side of the vehicle body by a predetermined length, and extends the jack downward to ground the float at the lower end of the jack to the ground. It is to support.

[0004] The outrigger generally has a storage box fixed along the width direction of the vehicle body, so that the telescopic beam projects horizontally in the width direction of the vehicle body. In this case, when the telescopic beam is stored in the storage box, the storage box protrudes as much as possible to the side of the vehicle body (outside the vehicle width) so that the outrigger and the obstacle do not interfere with each other when the vehicle is running. It is installed not to be. Therefore, the length of the storage box is limited at most to the width of the vehicle, and accordingly the length of the telescopic beam stored in the storage box is also limited. As a result, the maximum extension length of the outrigger is limited to the vehicle width. Will be restricted accordingly.

Therefore, the outrigger is provided with a maximum extension length regardless of the vehicle width, and the outrigger is stored in the vehicle width so as to prevent interference between the outrigger and an obstacle during traveling. Conventionally, it has been proposed to attach it to be rotatable with respect to the motor (Japanese Patent Publication No. 4-48719). That is, in this configuration, the outrigger is stored along the longitudinal direction of the vehicle body, and when the outrigger is used, the outrigger is rotated from the storage position toward the side of the vehicle body and protrudes.

[0006]

As described above, in the configuration in which the outrigger is rotatably attached to the vehicle body, the end of the outrigger stored along the longitudinal direction of the vehicle body projects greatly beyond the entire length of the vehicle body. Then, the protruding end portion of the outrigger may interfere with an obstacle during a turning traveling through a corner or the like of a narrow alley. This is because the protruding end of the outrigger is located on the outermost side of the vehicle turning locus. This is especially true for wheel cranes that were created in pursuit of downsizing and turning.
Serious.

Further, in the configuration in which the outrigger is rotatably mounted on the vehicle body, the outrigger is inadvertently rotated when the upper revolving unit turns, unless the outrigger can not be fixed in a protruding state (rotation angle cannot be fixed). This makes it difficult to ensure work stability.

[0008] Generally, the jack of the outrigger is
As shown in FIG. 10, an outer cylinder 101 constituting a cylinder portion
And an inner cylinder 102 as a rod portion which is accommodated in the outer cylinder 101 and expands and contracts. A float 103 is fixed to a lower end of the inner cylinder 102. As shown in the figure, the jack 110 having a rectangular cross section (the cross section of the inner cylinder and the outer cylinder is rectangular) is conventionally configured such that the symmetric axis O of the rectangular cross section is oriented in the longitudinal direction of the telescopic beam 100. , Is attached to the end of the telescopic beam 100.

[0009] However, one problem arises in such a manner of mounting the jack 110. That is, in general,
When the outrigger extends, a downward force F (see an arrow in the drawing) acts on the telescopic beam 100 due to the load of the vehicle body including the upper swing body. This downward force F causes the jack 1
10 is an outer cylinder 10 facing the longitudinal direction of the telescopic beam 100
1 and the side surface 102 of the inner cylinder 102
a and 102b are bent by receiving a force such that they abut against each other. In this state, when the revolving body mounted on the vehicle body turns and the turning operation is suddenly stopped, the accompanying moment of inertia acts on the jack 110.
Such a moment of inertia causes the jack 110
Receives a force such that the side surface 101c (101d) of the outer cylinder 101 extending along the longitudinal direction of the telescopic beam 100 and the side surface 102c (102d) of the inner cylinder 102 abut against each other, and the side surfaces 101c, 102c (101d). ,
The clearance between steps 102d) causes rattling and causes the vehicle body to vibrate.

[0010] Such an adverse effect caused by the turning moment of the revolving body is particularly remarkable when the outrigger is rotatably attached to the vehicle body and projects obliquely to the vehicle body.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to solve a conventional problem that occurs when an outrigger is rotatably mounted on a vehicle body. Specifically, a wheel in which the stored outrigger does not interfere with an obstacle when the vehicle travels, and the outrigger does not rotate carelessly and the jack does not undesirably bend when the revolving unit turns. To provide a crane.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a revolving unit having a dual-purpose driving cab capable of performing both operations of crane operation and vehicle traveling on a vehicle body via a revolving bearing. In a wheel crane that is pivotally mounted, the wheel crane includes an outrigger that is rotatably mounted on a vehicle body frame and that rotates about a support shaft located near a slewing bearing, wherein the outrigger is disposed in a longitudinal direction of the vehicle body. Along with being rotated between a storage position where it is stored along and a projecting position where it protrudes to the side of the vehicle body, at the storage position, a tip end projecting from a longitudinal end of the vehicle body is within the vehicle body width. It is characterized by being located in.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a wheel crane (rough terrain crane) according to an embodiment of the present invention.
1 is shown. As shown, wheel crane 1
Is provided with a dual-purpose cab (hereinafter, referred to as a cab) 14 that can perform both operations of crane work and vehicle travel.

The wheel crane 1 has a carrier 10 as a running vehicle body, and a turning table (slewing bearing) 12 is mounted on the carrier 10. A revolving body 16 having a cab 14 and a telescopic boom 18 is rotatably mounted on the revolving base 12. In this case, the telescopic boom 18 is formed by connecting a plurality of booms in a telescope shape, is extendable by a telescopic cylinder (not shown), and is stretched between the rotating body 16 and the lower surface of the proximal end boom 18a. The undulating cylinder (not shown) performs an undulating operation.

As shown in FIGS. 1 and 2, the carrier 1
Outriggers 26 are attached to both sides before and after the zero. Each outrigger 26 has a storage box 31 as an outer cylinder rotatably mounted on a body frame 10A of the carrier 10 via a support shaft 30 and an inner cylinder housed in the storage box 31 so as to be able to protrude and retract. A telescopic beam 32, a jack 33 detachably attached to the tip of the telescopic beam 32 and extending vertically below the telescopic beam 32, and a float 34 as a ground plate mounted at the lower end of the jack 33. ing.

As shown in detail in FIG.
The rotation support shaft 30 of the storage box 31 of No. 6 is provided near the turntable 12. Further, when the storage box 31 is rotated about the support shaft 30 and positioned at a storage position along the longitudinal direction of the vehicle body (a position indicated by a solid line in FIG. 2), the distal end of the storage box 31 is positioned on the vehicle body frame 10A. The length is set to reach the longitudinal end.

In FIG. 2, L1 indicates the minimum turning locus drawn by the outer edge of the longitudinal end of the vehicle body (in this embodiment, the outer edge of the body frame 10A) when the steering wheel is fully turned to the right. ing. L2 indicates the minimum turning locus drawn by the outer edge of the longitudinal end of the vehicle body (in the present embodiment, the outer edge of the vehicle body frame 10A) when the steering wheel is fully turned to the left. As shown by a solid line in FIG. 2, in the storage state where the storage box 31 is rotated to the storage position along the longitudinal direction of the vehicle body and the telescopic beam 32 is completely stored in the storage box 31, the jack 33 is mounted on the vehicle body. The frame 10A is positioned so as to substantially abut the longitudinal end of the frame 10A, and is located inside the turning trajectories L1 and L2 at the abutting position. In other words, the outrigger 26 has the front end thereof at the front wheel W
1 and projecting rearward of the rear wheel W2, the wheel W is substantially parallel to the longitudinal center axis of the body frame 10A and the wheel W
1 and W2, are stored above and inside the vehicle turning trajectories L1 and L2 (therefore, within the vehicle body width), at the storage position, the front end projecting from the longitudinal end of the body frame 10A. It has become.

The body frame 10A and the outrigger 2
6, the outrigger 26 is rotated between a storage position indicated by a solid line in FIG. 2 and an extended position on the side of the vehicle body (an example of the extended position is indicated by a dashed line in FIG. 2). A hydraulic cylinder 50 is provided.

As shown in detail in FIG.
Numeral 0 is composed of a cylinder part 50A and a telescopic rod part 50B. The base end of the cylinder portion 50A is rotatably attached to a bracket 72 fixed to the vehicle body frame 10A. In this case, by inserting a pin (not shown) between the pin insertion hole 49 provided in the bracket 72 and the pin insertion hole 45 provided in the base end of the cylinder portion 50A, the cylinder portion 50A rotates with respect to the bracket 72. Mounted movably. Also, the rod portion 50B
Is rotatably attached to a bracket 70 fixed to the side surface of the storage box 31 of the outrigger 26. Also in this case, by inserting a pin (not shown) across the pin insertion hole 44 provided in the bracket 70 and the pin insertion hole 43 provided at the tip of the rod portion 50B, the rod portion 50B rotates with respect to the bracket 70. Mounted movably.

The hydraulic cylinder 50 is provided with a positioning mechanism for fixing the protruding state of the rod portion 50B from the cylinder portion 50A and fixing the rotation angle (extended state) of the outrigger 26 (storage box 31). I have. The positioning mechanism includes an outer cylinder 41 fixed to the cylinder 50A.
And an inner cylinder 42 which is connected to the rod portion 50B via a pin 78 so as to swing up and down and is slidably inserted into the outer cylinder 41, and an air cylinder 60 fixed to the outer cylinder 41.
And a plurality of cutout grooves 62A, 62B, 62C formed on the upper edges of both side surfaces 42a, 42a of the inner cylinder 42 and engageable with the telescopic rod 60A of the air cylinder 60.

As shown in FIG. 4, the outer cylinder 41 is formed as a box having a concave section with an open lower side. In addition, the inner cylinder 42 is formed as a box having a concave cross section that is open on the upper side. The inner cylinder 42 is positioned such that its upper opening faces the lower opening of the outer cylinder 41.
And fitted together. The side surfaces 42a, 42a of the inner cylinder 42 have connection plates 47, 4 at their upper ends.
8 are connected.

The air cylinder 60 has a flange 60
It is fixed to the side surface of the outer cylinder 41 using a. An opening 41a is formed in a side surface portion of the outer cylinder 41 to which the air cylinder 60 is fixed, so as to allow the telescopic rod 60A of the air cylinder 60 to pass therethrough.

The notches 62A, 62B, 62C formed in the upper edges of both side surfaces 42a, 42a of the inner cylinder 42
It has an engaging portion 68 that engages with the telescopic rod 60A of the air cylinder 60, and an inclined portion 69 that is smoothly connected to the engaging portion 68 and rises obliquely. The rising end portion of the inclined portion 69 is formed as a flat surface, and is connected to the engaging portion 68 of the adjacent notch groove with a step.

In such a configuration, the telescopic rod 60A of the air cylinder 60 has the notch grooves 62A, 62B, 62C.
Of the inner cylinder 42 (sliding in a direction protruding from the outer cylinder 41), that is, the extension operation of the rod 50B of the hydraulic cylinder 50 is restricted. However, on the other hand, due to the presence of the inclined portion 69,
The rearward sliding of the inner cylinder 42 (sliding in the direction accommodated in the outer cylinder 41), that is, the contraction operation of the rod portion 50B of the hydraulic cylinder 50 is allowed. That is, the positioning mechanism constitutes a so-called ratchet mechanism.

An urging spring 57 for urging the inner cylinder 42 upward is connected to the connecting plate 48 on the distal end side of the inner cylinder 42. The biasing spring 57 always holds the inner cylinder 42 at an upper position where the rod 60A of the air cylinder 60 can engage with the engaging portion 68 of the notch grooves 62A, 62B, 62C. Further, as the inner cylinder 42 slides backward, the rod 60A of the air cylinder 60
When the inner cylinder 42 comes into contact with the inclined portion 69 of 2A, 62B, 62C, the inner cylinder 42 moves downward by the pressing force received from the rod 60A, and the spring 57 is extended by the inner cylinder 42.
At this time, the spring 57 urges the inner cylinder 42 upward by the restoring force. Therefore, by this biasing force,
The rod 60A located on the inclined portion 69 can be engaged with the engaging portion 68 again.

FIG. 5 shows a hydraulic circuit for driving the hydraulic cylinder 50. As shown in the figure, a pressure oil supply pipe 84 extending from the hydraulic pump P is connected to two connection pipes 82 and 83 via a direction switching valve 81. One connecting pipe 82 is connected to the rod-side chamber of the hydraulic cylinder 50, and the other connecting pipe 83 is connected to the head-side chamber of the hydraulic cylinder 50. Further, a return conduit 85 communicating with the tank T is connected to the direction switching valve 81. In order to maintain the extended state of the rod portion 50B of the hydraulic cylinder 50, a pilot check valve 80 opened toward the head-side chamber is interposed in the middle of a connection pipe 83 connected to the head-side chamber of the hydraulic cylinder 50. Have been.

FIGS. 6 and 7 show the connection between the telescopic beam 32 and the jack 33 in the outrigger 26. FIG. As shown in FIG. 6A, the jack 33 is disposed through an outer cylinder 33A, an inner cylinder 33B slidably inserted into the outer cylinder 33A, and the inside of the outer cylinder 33A and the inner cylinder 33B. And a hydraulic cylinder 33C (see FIG. 7) that slides the inner cylinder 33B with respect to the outer cylinder 33A. As shown in detail in FIG. 7, both the outer cylinder 33A and the inner cylinder 33B are formed in a rectangular cross section.

As shown in FIG. 6A, the outer cylinder 33A
A mounting member 38 is fixedly attached to. Mounting member 38
Has a number of pin insertion holes 36 along its height.
Is provided. On the other hand, at the tip of the telescopic beam 32 to which the jack 33 is attached, for example, two pin insertion holes 35 are provided vertically above and below each other.

In such a configuration, any two of the pin insertion holes 36 provided in the jack 33 are used.
6, 36 into two pin insertion holes 35, 3 of the telescopic beam 32.
5 and a fixing pin (not shown) is inserted into these holes 35 and 36, so that the jack 33 is connected and fixed to the tip of the telescopic beam 32. In this case, by appropriately selecting the pin insertion hole 36 into which the fixing pin is inserted on the jack 33 side, the mounting height of the jack 33 with respect to the telescopic beam 32 is increased in multiple stages as shown in FIG. Can be changed.

In the state where the jack 33 is fixed to the tip of the telescopic beam 32 by such a connection method,
As shown in FIG. 7B, the axis of symmetry O of the rectangular cross section of the jack 33 is oriented at an angle of approximately 45 degrees with respect to the longitudinal direction of the telescopic beam 32. In other words, jack 33
Is oriented substantially parallel to the longitudinal direction of the telescopic beam 32.

The work of inserting and removing the fixing pin from the insertion holes 35 and 36 is manually performed by the operator H himself, as shown in FIG. 6B. In this case, the jack 33 may be lifted by hand, or the jack 33 may be lifted by using a hook 37 of a crane. In addition, telescopic beam 3
As a mechanism for changing the mounting position of the jack 33 with respect to the height 2 in the height direction, the notch grooves 62A, 6 shown in FIG.
A ratchet mechanism applied to the engagement between the rods 2B and 62C and the rod 60A can also be used.

Next, the extension operation and the storage operation of the outrigger 26 configured as described above will be described. First, as shown by a solid line in FIG.
0B is extended to its maximum stroke, for example, and the outrigger 26 is stored along the longitudinal direction of the vehicle body (the telescopic beam 32 is completely stored in the storage box 31), as described above. The tip of 26 fits inside the vehicle turning trajectories L1, L2.

Next, from this storage state, the hydraulic cylinder 50
When the rod part 50B is contracted, the outrigger 2
6 rotates around the support shaft 30 and projects to the side of the vehicle body. Therefore, if the amount of pressurized oil supplied to the rod-side chamber of the hydraulic cylinder 50 is controlled to fix the rod portion 50B at a predetermined contracted position, the outrigger 26 can be fixed at a predetermined extended position (a predetermined rotation angle). it can.
However, in the present embodiment, since the positioning mechanism is provided so that the outrigger 26 does not inadvertently rotate during the crane operation, by using this, the outrigger 26 is securely fixed at a predetermined overhang position. be able to.

That is, when the rod portion 50B of the hydraulic cylinder 50 is contracted by a predetermined amount while the outrigger 26 is located at the storage position, the most proximal end formed on the upper edge of the side surfaces 42a, 42a of the inner cylinder 42 is formed. The engaging portion 68 of the first notch groove 62A is moved to a position facing the rod 60A of the air cylinder 60. Therefore, in this position, the rod 6
When 0A is extended, the rod 60A
1a to engage with the engaging portion 68 of the first notch groove 62A (see FIG. 4A).

When the rod 60A engages with the engaging portion 68 of the first cutout groove 62A in this manner, the inner cylinder 42 slides forward (slides in a direction protruding from the outer cylinder 41), that is, the hydraulic cylinder. The extension operation of the 50 rod portion 50B is regulated. Therefore, the outrigger 26 is not rotated to the storage side. However, due to the presence of the inclined portion 69, the rearward sliding of the inner cylinder 42 (sliding in the direction of being housed in the outer cylinder 41), that is,
Since the contraction operation of the zero rod portion 50B is permitted, a slight pressure is applied to the head side chamber of the hydraulic cylinder 50 in a state where the rod 60A and the engagement portion 68 are engaged in order to securely fix the position of the outrigger 26. Oil is supplied to urge the rod portion 50B in the extending direction, and the end face of the engaging portion 68 is pressed against the rod 60A. As a result, the rotation of the outrigger 26 is reliably restricted in both the storage side and the overhang side, and
The outrigger 26 includes the rod 60A and the first notch groove 6.
It is reliably positioned and fixed at the first rotation position (overhang position) corresponding to the contraction amount of the hydraulic cylinder 50 that engages with 2A.

When the outrigger 26 is further extended from this state, the rod 60A of the air cylinder 60 is engaged with the first cutout groove 62A (the state shown in FIG. 4A). What is necessary is just to contract the rod part 50B of the hydraulic cylinder 50. At this time, the rod 60A of the air cylinder 60 is
Comes into contact with the inclined portion 69 of the first notch groove 62A,
The inner cylinder 42 moves downward due to the pressing force received from the rod 60 </ b> A, and the spring 57 is extended by the inner cylinder 42. When the rod portion 50B is further contracted in this state, the inner cylinder 42 is urged upward by the restoring force of the spring 57.
A can then engage the engaging portion 68 of the second cutout groove 62B. Also at this time, if the rod portion 50B is urged in the extending direction and the end face of the engaging portion 68 is pressed against the rod 60A, the rotation of the outrigger 26 is reliably restricted in both the retracted side and the extended side, and 26 is reliably positioned and fixed at a second rotation position (extended position) corresponding to the contraction amount of the hydraulic cylinder 50 that engages the rod 60A and the second notch groove 62B. Further, if the rod portion 50B is further contracted from this state to engage the rod 60A of the air cylinder 60 with the engaging portion 68 of the third notch groove 62C, the outrigger 26
Can be reliably positioned and fixed at the third rotation position (overhang position).

When the outrigger 26 protruding to the side of the vehicle body is stored in the storage position shown by the solid line in FIG. 2, the rod 60A and the notch groove 62A, as shown in FIG. The engagement with the cylinders 62B and 62C may be released, and the rod 50B of the hydraulic cylinder 50 may be extended to, for example, the maximum stroke.

As described above, the wheel crane 1 of this embodiment has the outrigger 26 rotatably mounted on the vehicle body. Therefore, outrigger 26
The maximum overhang length can be assured regardless of the body width.

Further, the wheel crane 1 of the present embodiment
Is a state in which the outrigger 26 is stored along the longitudinal direction of the vehicle body (a state in which the telescopic beam 32 is completely stored in the storage box 31), and the distal end of the outrigger 26 is positioned inside the vehicle turning trajectories L1, L2. To fit in. Therefore, even when the vehicle travels through a narrow corner or the like during traveling of the vehicle, the distal end portion of the outrigger 26 at the storage position does not interfere with an obstacle. In particular, this effect is extremely useful for a wheel crane that requires small size and small turning properties.

The outrigger 26 is stored above the inside of the wheels W1 and W2 with its tip protruding forward of the front wheel W1 or backward of the rear wheel W2. Therefore, the stored outrigger 26 does not interfere with the wheels W1 and W2. Of course, the outrigger 26 is pivoted horizontally from the storage position and extended so that it does not interfere with the wheels W1 and W2 even when extended. In particular, since the outrigger 26 is stored inside the wheels W1 and W2, even if the total length of the storage box 31 is set to a length that reaches the longitudinal end of the vehicle body, the distal end of the outrigger 26 is moved to the vehicle turning locus L1. , L2.

In the wheel crane 1 of the present embodiment, the pivot 30 of the outrigger 26 is located near the swivel 12. Therefore, even if the tip of the outrigger 26 is placed inside the vehicle turning trajectories L1 and L2, the entire length of the outrigger 26 can be sufficiently long and the revolving unit 1 can be secured.
Since the distance from the turning center of No. 6 to the outrigger 26 is reduced, the torsional deformation of the body frame 10A during the crane operation is reduced.

Further, the wheel crane 1 of the present embodiment
Is provided with a positioning mechanism for fixing the rotation angle (extended state) of the outrigger 26. Therefore, the outrigger 26 does not inadvertently rotate when the upper revolving unit 16 turns, and the work stability can be ensured. In particular, in the present embodiment, since the outrigger 26 can be set and fixed at a plurality of overhang positions (rotational positions) by the positioning mechanism, it can cope with various work states.

Further, in the wheel crane 1 of the present embodiment, the mounting position of the jack 33 on the telescopic beam 32 can be changed in the height direction. Therefore, even if the outrigger 26 is overhanged on a stepped land or a sloped land with a large difference in height, the vehicle body can be always kept horizontal. Further, the outrigger 26 can be extended beyond a guardrail, a fence, or the like.

In the wheel crane 1 of this embodiment, the symmetrical axis O of the rectangular cross section of the jack 33 is approximately 45 degrees with respect to the longitudinal direction of the telescopic beam 32 in a state where the jack 33 is fixed to the tip of the telescopic beam 32. It can be oriented in degrees. In such a mounting form, the jack 33 is caused to move at the corners 76 and 77 oriented in the longitudinal direction of the telescopic beam 32 by the downward force F acting on the telescopic beam 32 due to the load on the vehicle body, and the outer cylinder 33A. And the inner cylinder 33B are deflected by receiving a force such that they abut each other. In this state, when the revolving unit 16 mounted on the vehicle body turns and the turning operation is suddenly stopped, the moment of inertia accompanying the operation acts on the jack 33. At this time, the jack 33 The backlash is restricted by the corners 76 and 77 (more precisely, the edges e and e of the two side surfaces of the outer cylinder 33A and the inner cylinder 33B forming the corners 76 and 77). Never do.

It should be noted that the same effects as in the present embodiment can be obtained even when the cross-sectional shapes of the outer cylinder 33A and the inner cylinder 33B are elliptical. Also, the play of the jack 33 can be restricted by the form as shown in FIG. That is,
In the configuration of FIG. 8, the float 34 is mounted offset from the center axis O ′ of the hydraulic cylinder 33C. That is, with respect to the hydraulic cylinder 33C, the float 34
Of the hydraulic cylinder 33C is eccentric from the center of the mounting pin 75 for mounting the hydraulic cylinder 33C.

Accordingly, when the vehicle body is supported by the outrigger 33 having such a configuration (see FIG. 8B),
Due to the offset action of the float 34, the telescopic beam 32
Of the inner cylinder 33B and the outer cylinder 33A facing in the longitudinal direction are forcibly abutted at the X portion and the Y portion. Therefore, even if the moment of inertia generated due to the turning operation of the turning body 16 acts on the jack 33, the jack 33
The play at the X portion and the Y portion limits the play. Therefore, the vehicle body does not vibrate.

FIG. 9 shows another configuration of the positioning mechanism for fixing the rotation angle (extended state) of the outrigger 26 (storage box 31). Note that members common to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

The illustrated positioning mechanism includes a boomerang-shaped movable body 92 that is pin-joined to a bracket 90 fixed to the storage box 31 of the outrigger 26 and that rotates integrally with the outrigger 26, and that the movable body 92 has a bending direction. Engagement holes 93A, 93B, 93 provided along
C, 93D and these engagement holes 93A, 93B, 93C,
An air cylinder 100 having an extendable rod 100A that can be engaged with 93D is provided, and a support 95 fixed to the vehicle body frame 10A and supporting the air cylinder 100 is provided. The first hole 92A provided in the movable body 92 is a hole for holding the rotation angle of the outrigger 26 at 45 degrees, and the second hole 92B is for holding the rotation angle of the outrigger 26 at 30 degrees. The third hole 92C is a hole for holding the rotation angle of the outrigger 26 at 15 degrees, and the fourth hole 92D is a hole for holding the outrigger 26 in the storage position (when the rotation angle is 0).
It is a hole for holding in (degree).

Further, the support 95 is provided with a pair of plates 95A,
B and the plates 95A and 95B are connected to each other and both sides of the movable body 92 are held, so that the outrigger 2
6 comprises cylindrical guide members 95C and 95D for guiding the movement of the movable body 92 which operates in accordance with the rotation of 6. The plate plates 95A and 95B are provided with holes through which the extendable rod 100A can pass.

The support shaft 30, which is the center of rotation of the outrigger 26, is provided with a potentiometer for detecting the angle of rotation of the outrigger 26. The air cylinder 100 has a telescopic rod 100A and an engagement hole 93A,
First proximity switch 102 for confirming engagement with 93B, 93C, 93D (rotation lock of outrigger 26)
And a second proximity switch 103 for confirming the disengagement (release of the rotation lock).

In the positioning mechanism having such a configuration, the rotation angle of the outrigger 26 is detected by a potentiometer, and when it is detected that a desired rotation angle (overhang amount) has been reached, the extension rod of the air cylinder 100 is extended. 100A is extended to engage holes 93A, 93B, 93 having a corresponding rotation angle.
C, 93D.

In this configuration, the engagement holes 93A, 93B, 93C, 9D are provided in order to smoothly engage the telescopic rod 100A with the engagement holes 93A, 93B, 93C, 93D.
The inner diameter of the 3D is set to be larger than the outer diameter of the telescopic rod 100A. Therefore, in this configuration, in order to ensure the positioning during overhang or storage, when the locked state is confirmed by the first proximity switch 102, oil is supplied to the hydraulic cylinder 50 so that the locked state is not rattled. Then, the telescopic rod 100A may be pressed against the end faces of the engagement holes 93A, 93B, 93C, 93D.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the scope of the invention. For example, in the above embodiment, the outrigger 26 is rotated by the hydraulic cylinder 50, but the outrigger 26 may be rotated by a motor or manually. Further, in the above embodiment, the rod 60A of the air cylinder 60 is extended so that the notches 62A,
2B and 62C, the outrigger 26 was positioned, but the cutout grooves 62A, 62B,
The outrigger 26 may be positioned by manually engaging the lock pin with 62C. In the above embodiment, the number of the notch grooves provided in the inner cylinder 42 is three.
However, the present invention is not limited to this. The greater the number of notched grooves, the more outrigger 2
6 can be positioned. In this embodiment, the outrigger 2 is extended by the extension operation of the hydraulic cylinder 50.
6, the outrigger 26 is retracted by the contraction operation of the hydraulic cylinder 50, but the outrigger 26 is retracted by the contraction operation of the hydraulic cylinder 50, and the outrigger 26 is extended by the extension operation of the hydraulic cylinder 50. You may come to be.

[0054]

As described above, according to the wheel crane of the present invention, the problem that occurs when the outrigger is rotatably attached to the vehicle body, that is, the outrigger and the obstacle between the vehicle running. It is possible to effectively prevent interference, inadvertent rotation of the outrigger at the time of turning of the rotating body, and undesired bending of the jack.

Further, since the mounting position of the jack with respect to the telescopic beam can be changed in the height direction, the vehicle body can always be kept horizontal even if the outrigger is overhanged on a stepped land or a sloping land with a large height difference. Further, the outrigger can be extended beyond a guardrail, a fence or the like.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a wheel crane according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the wheel crane of FIG. 1 with the revolving superstructure removed.

FIG. 3A is a plan view of a mechanism for rotating an outrigger, and FIG. 3B is a longitudinal sectional view along the AA direction of FIG.

FIG. 4 is a view in the direction of arrow B in FIG. 3 (a).

FIG. 5 is a hydraulic circuit for driving a hydraulic cylinder that rotates an outrigger.

FIG. 6 is a diagram showing a connection form between a telescopic beam and a jack.

FIG. 7A is a side sectional view of a jack connected and fixed to the distal end of a telescopic beam, and FIG. 7B is a view in the direction of arrow C in FIG.

FIG. 8 is a side sectional view of a jack according to a modified example of the configuration in FIG. 7;

FIG. 9 shows another example of the configuration of the positioning mechanism for fixing the rotation angle of the outrigger, (a) is a plan view of the positioning mechanism,
(B) is sectional drawing which follows the EE line | wire of (a).

10A is a side sectional view of a conventional jack connected and fixed to the tip of a telescopic beam, and FIG. 10B is a sectional view of D in FIG.
It is a direction arrow view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wheel crane 12 ... Turning table (slewing bearing) 26 ... Outrigger 30 ... Support shaft

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[Procedure amendment]

[Submission date] August 5, 1998 (1998.8.5)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

Claims (5)

[Claims] 1. A wheel crane having a revolving body provided with a dual-purpose driver's cab capable of performing both operations of a crane operation and a vehicle traveling so as to be pivotable on a vehicle body via a pivot bearing. An outrigger movably mounted and pivoting about a support shaft located near the slewing bearing, the outrigger protruding to a storage position stored along a longitudinal direction of the vehicle body and to a side of the vehicle body. A wheel crane which is pivoted between an overhang position and a front end protruding from a longitudinal end of the vehicle body is located within the vehicle body width in the storage position. 2. The outrigger in the storage position,
The wheel crane according to claim 1, wherein, when the vehicle body turns, the outer edge of the longitudinal end of the vehicle body falls within a minimum turning locus drawn by the vehicle. 3. The wheel crane according to claim 1, further comprising positioning means for mechanically positioning and fixing the outrigger at at least one overhang position. 4. The outrigger has a telescopic beam and a jack detachably attached to a tip of the telescopic beam, and has means for changing a mounting position of the jack with respect to the telescopic beam in a height direction. The wheel crane according to claim 1 or 2, wherein: 5. The jack has a rectangular cross section, and when attached to the telescopic beam, the symmetric axis of the rectangular cross section is oriented at an angle of approximately 45 degrees with respect to the longitudinal direction of the telescopic beam. The wheel crane according to claim 3, wherein: