Cam adjustment mechanism, cam adjustment method, outrigger

Abstract

To provide a cam adjustment mechanism which can adjust contact state between an arm and a cam, a cam adjustment method, and an outrigger.SOLUTION: A cam adjustment mechanism adjusts a contact state of a columnar cam 52 with an arm 20 when an attitude of a floor-plate part 31 changes from a floor-plate storage attitude to a floor-plate installation state with respect to an outrigger floor-plate installation device that can be applied to an outrigger comprising the cam 52 which contacts the arm 20 when the attitude of the floor-plate part 31 changes from the floor-plate storage attitude to the floor-plate installation state. The outrigger floor-plate installation device so makes the attitude of the floor-plate part 31 to be a preset attitude before reaching the floor-plate storage attitude in the state that a vertical outrigger box is contracted to the maximum. The preset attitude is an attitude according to a contact state between the arm 20 and the cam 52, and the contact state between the arm 20 and the cam 52 can be adjusted by adjusting a rotational position of the cam 52 with respect to the arm 20 in the floor-plate storage attitude.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a cam adjustment mechanism, a cam adjustment method, and an outrigger that can be applied to an outrigger provided on a crane-mounted vehicle such as a truck. [Background technology]

[0002] 2. Description of the Related Art Crane-mounted vehicles, such as trucks, are provided with outriggers to prevent the crane-mounted vehicle from tipping over during work using a crane. The outrigger has a vertical outrigger box formed to be extendable and contractable by a cylindrical outer box and an inner box displaceable relative to the outer box, and when the outrigger is used, the vertical outrigger box is extended. Also, when the outrigger is used, a base plate that supports the outrigger is used to receive the load, as disclosed in Patent Document 1, for example. In the configuration disclosed in Patent Document 1, floor plates are stored on a crane-mounted vehicle, and when the outriggers are used, the floor plates are set in place by human power. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-122959 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration disclosed in Patent Document 1, the floor plates must be manually installed and stored every time the outriggers are used, which reduces work efficiency. To address this issue, one possible solution would be to adopt a configuration that allows the decking to be automatically installed and stored in conjunction with the extension and retraction of the vertical outrigger boxes.

[0005] In a configuration capable of automatically installing and storing the floor plate, the position in which the floor plate is stored depends on the contact state between the arm and cam, which are the parts that come into contact when changing the position of the floor plate, when the vertical outrigger box is in the most retracted state. The arm has, for example, one end connected to the floor plate and is configured to be rotatable with respect to the vertical outrigger box. The cam is, for example, fixed to a ground side bracket arranged on a float that moves with the extension and retraction of the vertical outrigger, and is configured to transmit the thrust force when the inner box of the vertical outrigger is retracted to the arm and perform the retracting operation of the floor plate.

[0006] However, the contact state between the arm and the cam may change due to assembly errors or wear that occurs with use of the outrigger. In view of the above-mentioned problems, an object of the present invention is to provide a cam adjustment mechanism, a cam adjustment method, and an outrigger that are capable of adjusting the contact state between an arm and a cam. [Means for solving the problem]

[0007] A cam adjustment mechanism according to one aspect of the present invention is a mechanism for adjusting the contact state of a cam with an arm when the attitude of the floor plate part changes from a floor plate storage attitude to a floor plate installation attitude for an outrigger floor plate installation device applicable to an outrigger including a vertical outrigger box, a floor plate part, a floor plate installation mechanism part, a floor plate storage mechanism part, a float, an arm, a ground side bracket, and a cam. The vertical outrigger box is formed by a cylindrical outer box and an inner box which is inserted into the outer box from one end and displaced relative to the outer box. The attitude of the floor plate part changes in response to the expansion and contraction of the vertical outrigger box. The floor plate installation mechanism part displaces the floor plate part in conjunction with the extension of the vertical outrigger box so that the attitude of the floor plate part changes from the floor plate storage attitude in which a surface of the floor plate part opposite to a surface that contacts the ground faces a side surface of the outer box to a floor plate installation attitude in which the floor plate part is disposed between the inner box and the ground. The floor plate storage mechanism changes the attitude of the floor plate section from the floor plate installation attitude to the floor plate storage attitude in conjunction with the operation of the vertical outrigger boxes shrinking, and when the vertical outrigger boxes are in the most contracted state, the attitude of the floor plate section is set to a preset attitude before reaching the floor plate storage attitude. The float is attached to the other end of the inner box. One end of the arm is rotatably attached to a surface of the floor plate section that faces the float in the floor plate installation attitude. The ground side bracket is disposed at a position of the float that faces the outer box when the attitude of the floor plate section is in the floor plate storage attitude. The cam is formed in a cylindrical shape, is fixed to the ground side bracket, and comes into contact with the arm when the attitude of the floor plate section changes from the floor plate storage attitude to the floor plate installation attitude. The preset attitude is an attitude according to a contact state between the arm and the cam, and the contact state can be adjusted by adjusting the rotational position of the cam relative to the arm in the floor plate storage attitude.

[0008] A cam adjustment method according to one aspect of the present invention is a method for adjusting a contact state of a cam with an arm when the attitude of the floor plate part changes from a floor plate storage attitude to a floor plate installation attitude for an outrigger floor plate installation device applicable to an outrigger including a vertical outrigger box, a floor plate part, a floor plate installation mechanism part, a floor plate storage mechanism part, a float, an arm, a ground side bracket, and a cam. The preset attitude is an attitude according to the contact state between the arm and the cam, and the contact state is adjusted by rotating the cam to sandwich the shim between the arm and the cam in a state in which a shim formed to a preset thickness is placed between the arm and the cam in the floor plate storage attitude. The preset thickness is a thickness according to the contact state between the arm and the cam in the preset attitude. Additionally, an outrigger according to one aspect of the present invention includes a cam adjustment mechanism. Effect of the Invention

[0009] According to the cam adjustment mechanism, cam adjustment method, and outrigger of the present invention, it is possible to adjust the contact state between the arm and the cam by adjusting the position of the cam relative to the arm in the floor plate storage position. [Brief description of the drawings]

[0010] [Figure 1] 1 is a side view of a vehicle-mounted crane equipped with an outrigger floor plate installing device according to an embodiment. FIG. [Diagram 2] FIG. 2 is a front view of the crane removed from the vehicle. [Diagram 3] FIG. 2 is a perspective view of the crane removed from the vehicle. [Figure 4] FIG. 2 is a front view of the outrigger floor plate installation device. [Diagram 5] FIG. 2 is a view of the outrigger floor plate installation device as seen from the outside. [Figure 6] FIG. [Figure 7] 13A and 13B are diagrams showing contact states between the arm plate and the boss and cam when the floor plate is in the stored position; [Figure 8-1]13A to 13C are diagrams for explaining the flow of displacement of the floor plate unit during the floor plate installation operation. [Figure 8-2] 13A to 13C are diagrams for explaining the flow of displacement of the floor plate unit during the floor plate installation operation. [Figure 9] 13A and 13B are diagrams for explaining a structure for changing a fixing position of the cam. [Figure 10] 13A and 13B are diagrams for explaining the operation of extending the vertical outrigger boxes when the floor plate unit is in a locked state. [Figure 11] 13A and 13B are diagrams illustrating an operation of adjusting a preset attitude using a shim. [Figure 12] 13 is a diagram showing the rotation direction of the torque acting on the cam due to the force received from the rotating arm during the operation of contracting the inner box, and the rotation direction when the cam is tightened by a bolt. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a cam adjustment mechanism, an outrigger equipped with a cam adjustment mechanism, and a crane-mounted vehicle that is one embodiment of a work vehicle equipped with an outrigger according to the present invention will be described with reference to the drawings as appropriate. Note that the drawings are schematic. Therefore, it should be noted that the relationship and ratio between thickness and planar dimensions may differ from the actual ones, and the drawings may include parts with different dimensional relationships and ratios. In addition, the embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to the embodiments described below.

[0012] (Embodiment) <Configuration> A crane-mounted vehicle 100 equipped with an outrigger floor plate installation device 1 (which may be referred to as the "floor plate installation device 1" in the following description) for which the cam adjustment mechanism is used comprises a vehicle body 101 and a crane 105, as shown in Figure 1.

[0013] In the embodiment, as shown in FIG. 1, the vehicle body 101 is a truck. In the following description and drawings, the direction in which the crane-mounted vehicle 100 moves forward (the direction in which the vehicle moves with the shift selected in the D range or the like) may be referred to as "forward". Similarly, in the following description and drawings, the direction in which the crane-mounted vehicle 100 moves backward (the direction in which the vehicle moves with the shift selected in the R range) may be referred to as "rear". In the following description and drawings, the "left side" refers to the left side of the driver who drives the crane-mounted vehicle 100, and the "right side" refers to the right side of the driver who drives the crane-mounted vehicle 100. Therefore, in the following description and drawings, the "left side view" refers to the viewpoint of the driver who drives the crane-mounted vehicle 100 as seen from the left side, and the "right side view" refers to the viewpoint of the driver who drives the crane-mounted vehicle 100 as seen from the right side. In the following description, the "left side view" and the "right side view" may be collectively referred to as "side view".

[0014] The vehicle body 101 includes a loading platform 102, a driver's cab 103, and a chassis frame 104. On the loading platform 102, for example, cargo (building materials, etc.) to be suspended by a crane 105 is placed. The operator of the crane-equipped vehicle 100 and other personnel sit in the operator's cab 103. The chassis frame 104 forms the framework of the vehicle body 101 . The crane 105 is mounted on the chassis frame 104 . The crane 105 also includes a base 91, a column 92, a boom 93, a hook 94, and various actuators (not shown). The base 91 is formed in a rectangular cylindrical shape and is provided with an outrigger 80 . The column 92 is rotatably mounted on the base 91 .

[0015] The boom 93 is an extendable boom, and is attached to the upper end of the column 92 so as to be able to rise and fall freely. The tip side of a wire rope 106 is fixed to the hook 94. The wire rope 106 is wound from the base end side around a winch (not shown) provided on the column 92. The tip side of the wire rope 106 is unwound from the winch and placed at the tip of the boom 93, and is further fixed to the hook 94. As a result, the hook 94 is suspended from the tip of the boom 93.

[0016] The various actuators include actuators for rotating the column 92 (boom 93), raising and lowering the boom 93, hoisting and lowering the hook 94 by a winch, and extending and retracting the outriggers 80. The various actuators are operated by being individually supplied with pressure oil from a hydraulic supply source (not shown) provided in the vehicle body 101 via a switching control valve device.

[0017] (Outrigger) The outrigger 80 is mounted on the crane-mounted vehicle 100, and as shown in Figs. 2 and 3, comprises a pair of left and right lateral outrigger boxes 81, a pair of left and right vertical outrigger boxes 82, and a floor plate installation device 1. Note that in Fig. 2, the configuration of the outrigger 80 is omitted. In addition, in the drawings and the following description, the vertical outrigger box 82 arranged on the left side of the pair of left and right vertical outrigger boxes 82 may be referred to as the "left vertical outrigger box 82L". Similarly, in the drawings and the following description, the vertical outrigger box 82 arranged on the right side of the pair of left and right vertical outrigger boxes 82 may be referred to as the "right vertical outrigger box 82R".

[0018] The lateral outrigger box 81 is formed in a rectangular cylindrical shape. The base end side of the lateral outrigger box 81 is inserted into the inside of the base 91. This allows the lateral outrigger box 81 to slide relative to the base 91 in the left and right directions. In addition, the lateral outrigger box 81 can be slidably moved to the extended position H or the stored position K.

[0019] The extended position H is a position where the lateral outrigger box 81 extends from the base 91 to the right and left of the vehicle body 101. The stored position K is a position where the lateral outrigger box 81 is stored inside the base 91. In the embodiment, a case will be described in which the operator slides and moves the lateral outrigger box 81 by grabbing a gripping portion (not shown) provided on the outrigger 80 with his or her hand and performing a pulling or pushing motion.

[0020] The vertical outrigger box 82 is arranged at the tip side of the horizontal outrigger box 81. The vertical outrigger box 82 also includes an outer box 83, an inner box 84, a hydraulic cylinder (not shown), and a float 85. The outer box 83 is formed in a cylindrical shape (square cylindrical shape) and is fixed to the tip of the lateral outrigger box 81. The longitudinal direction of the outer box 83 is perpendicular to the longitudinal direction of the lateral outrigger box 81 when viewed from the front or rear. The four outer peripheral surfaces of the outer box 83 are parallel to the traveling direction and left-right direction of the vehicle body 101. Therefore, the longitudinal direction of the outer box 83 is oriented parallel to the height direction of the crane-mounted vehicle 100.

[0021] The inner box 84 is formed in a rectangular cylindrical shape with an outer diameter smaller than that of the outer box 83, and forms the vertical outrigger box 82 together with the outer box 83. One end of the inner box 84 is inserted inside the outer box 83. This allows the inner box 84 to slide vertically relative to the outer box 83.

[0022] The hydraulic cylinder is disposed inside the outer box 83 and the inner box 84 with the inner box 84 inserted inside the outer box 83 . One end of the hydraulic cylinder is fixed to an upper part of the outer box 83 inside the outer box 83. The other end of the hydraulic cylinder is fixed to a lower part of the inner box 84 inside the inner box 84. Therefore, when the hydraulic cylinder is extended or retracted, the inner box 84 slides up and down. In other words, by displacing the inner box 84 relative to the outer box 83, the vertical outrigger box 82 extends or retracts. In other words, the hydraulic cylinder provided in the vertical outrigger box 82 forms an actuator, among the various actuators provided in the crane 105, that displaces the inner box 84 relative to the outer box 83, thereby extending and contracting the vertical outrigger box 82. The float 85 is, for example, a plate-like member formed in a quadrilateral shape. The float 85 is attached to the other end of the inner box 84 with the thickness direction of the float 85 oriented parallel to the length direction of the inner box 84.

[0023] (Bottom plate installation device) The floor plate installing devices 1 are provided on each of the pair of left and right vertical outrigger boxes 82. That is, the crane-equipped vehicle 100 is equipped with the pair of floor plate installing devices 1 on the left and right. As shown in FIGS. 4 and 5, the floor plate installation device 1 includes a floor plate unit 2, an outer side guide mechanism 4, a ground side guide mechanism 5, a locking mechanism 6, a first cushion 7, and a pair of second cushions 8.

[0024] (Plate unit) The floor plate unit 2 includes an arm 20 and a floor plate 30, as shown in FIGS. <Arm> The arm 20 is formed using high tensile steel such as "HT590" for example. This is because the arm 20 is larger in size than the other components and receives the thrust generated when the outriggers 80 are operated and the weight of the crane-mounted vehicle 100 when the outriggers 80 are in use, so it is desirable for the arm 20 to be lightweight and have high strength. The arm 20 also includes a pair of arm plates 21 . The pair of arm plates 21 are connected by a connecting rod 28 formed in a cylindrical shape, and face the outer box 83 along the front or rear when the floor plate portion 31 is in the floor plate storage position.

[0025] The floor plate storage position is a position in which the floor plate 30 is stored, as shown in Fig. 2 when the floor plate installation device 1 is in storage position K. Specifically, the floor plate storage position is a position in which the surface of the floor plate part 31 opposite the surface that comes into contact with the ground faces the side surface of the outer box 83. In the floor plate storage position, the surface of the floor plate part 31 opposite the surface that comes into contact with the ground faces the side surface of the outer box 83 in the width direction of the crane-mounted vehicle 100. Further, the pair of arm plates 21 are formed in a shape that extends upward as it moves from the inside to the outside of the vehicle body 101 when the position of the floor plate portion 31 is the floor plate storage position.

[0026] As shown in Figures 4 and 6, each arm plate 21 has a tip portion 21D, a base end portion 21P, a protrusion portion 22, a bent portion 23, a notch portion 24, a hook portion 25, a cam contact surface 26, and an axis hole 27. The tip portion 21D forms an end portion of the arm plate 21 that is located downward when the position of the floor plate portion 31 is in the floor plate storage position. The base end portion 21P forms an end portion of the arm plate 21 that is located at the upper side when the position of the floor plate portion 31 is in the floor plate storage position.

[0027] The protrusion 22 is disposed at a position protruding from the center of the arm plate 21 to the outside of the vehicle body 101 (the side away from the vehicle body 101) when the floor plate part 31 is in the floor plate storage position. The protrusion 22 is formed in a trapezoidal shape when viewed from the front or rear. The bent portion 23 constitutes a portion on the side from the protruding portion 22 toward the base end portion 21P, and is formed by a portion bent toward the inside of the vehicle body 101.

[0028] The notch 24 is disposed at the boundary between the bent portion 23 and the protruding portion 22, and is formed in a V-shaped notch. The position of the notch 24 is set at a position where the inner peripheral surface of the notch 24 clamps the outer peripheral surface of the pipe 54 when the position of the floor plate portion 31 changes from the floor plate storage position to the floor plate installation position. The floor plate installation position is a position in which the floor plate 30 is installed, as shown in the state of the floor plate installation device 1 in the extended position H in Fig. 2. Specifically, the floor plate installation position is a position in which the floor plate portion is disposed between the inner box and the ground.

[0029] Hook portion 25 constitutes the portion extending from bent portion 23 toward tip portion 21D, and is formed in a hook shape that opens on the side opposite cutout portion 24. Moreover, the hook portion 25 has a pocket portion 25a. The pocket 25a is formed by cutting out a V-shape that forms the opening of the hook portion 25.

[0030] 4, the cam contact surface 26 forms a surface of the arm plate 21 that comes into contact with the cam 52. The cam 52 will be described later. In addition, the cam contact surface 26 is formed by a surface that continues from a position on the protrusion 22 that is closer to the tip 21D (the dashed line position shown on the upper side in Figure 6) to a position midway up to the tip 21D (the dashed line position shown on the lower side in Figure 6).

[0031] The cam contact surface 26 has a shape provided with a convex portion 26a and a concave portion 26b, as shown in FIG. 6, the protrusion 26a is formed in a shape that protrudes toward the floor plate part 31 in the floor plate storage position. The protrusion 26a is provided on a portion of the cam contact surface 26 that includes the tip portion 21D when viewed in the thickness direction of the arm plate 21 and continues to the vicinity of the midpoint of the cam contact surface 26. The specific position for forming the protrusion 26a is set to a position where the cam contact surface 26 comes into contact with the cam 52 when the posture of the floor plate part 31 changes between a preset intermediate posture and the floor plate storage posture. In other words, the cam 52 comes into contact with the arm 20 when the posture of the floor plate part 31 changes from the floor plate storage posture to the floor plate installation posture.

[0032] The intermediate position is set to a position in which the angle of the floor plate portion 31 is 45° when viewed from the front or rear, between the floor plate storage position and the floor plate installation position, for example. The inclination angle of the protrusion 26a is set at an angle that does not result in a dead point in the direction of the force acting from the cam 52 at the contact point between the cam 52 and the arm 20 when, for example, the position of the floor plate section 31 is changed from the floor plate installation position to the floor plate storage position. In this case, the inclination angle of the protrusion 26a is set when the vertical outrigger box 82 is in the most contracted state. The angle at which the direction of the force acting from the cam 52 at the contact point between the cam 52 and the arm 20 does not become a dead point is, for example, an angle that does not pass through the center BC of the boss 42, which is the center of the moment, as shown in Fig. 7(b). Note that in Fig. 7(b), the direction of the force acting from the cam 52 at the contact point between the cam 52 and the arm 20 is indicated by the symbol "FC".

[0033] Furthermore, the inclination angle of the protrusion 26a is set to an angle according to the acting force required to support the weight of the floor plate 30 when the vertical outrigger boxes 82 are most retracted when the attitude of the floor plate section 31 is changed from the floor plate installation attitude to the floor plate storage attitude. Specifically, the inclination angle of the protrusion 26a is set to an angle at which the acting force described above is equal to or less than the force obtained by decomposing the vector of the maximum retraction thrust force generated when the vertical outrigger boxes 82 are stored in the vertical direction of the cam contact surface 26, as shown in Fig. 7(b). Note that in Fig. 7(b), the directions of the forces obtained by decomposing the vector of the maximum retraction thrust force generated when the vertical outrigger boxes 82 are stored in the tangential direction of the cam contact surface 26 are indicated by symbols "B1" and "B2".

[0034] 6, the recess 26b is formed in a recessed shape on a surface facing the floor plate portion 31 in the floor plate storage posture. In addition, the recess 26b is provided in a portion farther from the tip portion 21D than the protrusion 26a when viewed in the thickness direction of the arm plate 21. A specific position for forming the recess 26b is set to a position where the cam contact surface 26 comes into contact with the cam 52 when the posture of the floor plate portion 31 changes between the intermediate posture and the floor plate installation posture. The shaft hole 27 is formed in a circular shape in the tip portion 21D. In addition, both ends of a connection rod 28 are fixed to the shaft hole 27. In the floor plate storage position, the connecting rod 28 is disposed inside the vertical outrigger box 82.

[0035] <Sill plate> The base plate 30 includes a base plate portion 31, a bracket portion 32, and a receiving metal fitting portion 35. (Bottom plate part) The base plate portion 31 is formed of high tensile steel such as "HT590" as with the arm 20. This is because the base plate portion 31 is larger in size than the other components and receives the thrust generated when the outriggers 80 are operated and the weight of the crane-mounted vehicle 100 when the outriggers 80 are in use, and therefore it is desirable for the base plate portion 31 to be lightweight and have high strength. The floor plate portion 31 is formed using a metal material such as high tensile steel, for example. However, the floor plate portion 31 may be formed from other materials such as wood, waste plastic, etc., without being limited to metal materials.

[0036] As shown in FIG. 5, the floor plate portion 31 has a trapezoidal plate shape when viewed from the side in the floor plate storage position. Specifically, the shape of the floor plate portion 31 is a combination of an upper floor plate portion 31u that forms the upper side of the floor plate portion 31 and a lower floor plate portion 31d that forms the lower side of the floor plate portion 31. The shape of the floor plate upper portion 31u is a trapezoid whose base is longer than its top when viewed in the thickness direction of the floor plate portion 31 in the floor plate storage position. The shape of the floor plate lower part 31d is a quadrilateral (rectangle) when viewed in the thickness direction of the floor plate part 31 in the floor plate storage position. The lower end of the upper floor plate 31u (the end on the lower floor plate 31d side) and the upper end of the lower floor plate 31d (the end on the upper floor plate 31u side) are the same length and are continuous with each other. Therefore, when viewed from the thickness direction of the floor plate portion 31 in the floor plate storage position, the upper side is a trapezoid whose base length is longer than the top side, and the lower side is a quadrilateral.

[0037] A ground cushion 37 is attached by adhesive or other means to a ground contact surface 31G of the floor plate portion 31, which is the surface facing the ground when the floor plate is in an installed position. The ground cushion 37 is made of an elastic material such as rubber, and is formed in a plate shape. The area of ​​the floor plate portion 31 is larger than the area of ​​the float 85. The floor plate portion 31 overlaps with the float 85 in the floor plate installation position.

[0038] (Bracket part) The bracket portion 32 is fixed by welding or the like to a surface of the floor plate portion 31 that comes into contact with the float 85 in the floor plate installation position (the inner surface of the floor plate portion 31). The bracket portion 32 is disposed on the inner surface of the floor plate portion 31 at a position close to the center of the floor plate portion 31. Further, the bracket portion 32 is provided with a bracket side cutout portion 32h. The bracket side cutout portion 32h is formed in a shape in which a part including the center of the side of the bracket portion 32 that is positioned upward when the floor plate is in the stored position is cut out. Additionally, the bracket side cutout portion 32h is formed to have a size such that it does not come into contact with the first cushion 7 when in the floor plate storage position.

[0039] Further, the bracket portion 32 is provided with a pair of arm mounting base portions 33 . The pair of arm mounting base portions 33 are formed at positions sandwiching the pair of arm plates 21 therebetween. Further, each of the pair of arm attachment base portions 33 is formed with a through hole (not shown) for inserting the arm attachment pin 34 therethrough. The arm mounting base portion 33 may be integrally formed with the bracket portion 32.

[0040] The pair of arm mounting pins 34 are inserted into through holes formed in the pair of arm mounting base portions 33 and through holes (not shown) formed in the bent portion 23, respectively. Both ends of the arm mounting pin 34 are treated to prevent it from coming off, at the through holes formed in the pair of arm mounting base portions 33 and on the outside of the shaft hole 27. As described above, the arm 20 is rotatably attached to the bracket portion 32 by the arm attachment pin 34 . As shown in FIG. 5, a torsion spring 36 is attached to each of the pair of arm mounting pins 34. The torsion spring 36 is a double torsion type spring. The central axis of the torsion spring 36 overlaps with the central axis of the arm attachment pin 34.

[0041] Moreover, the torsion spring 36 has two coil portions 36a. The force of the torsion spring 36 pressing the floor plate part 31 acts in a direction that rotates the floor plate part 31 about the arm mounting pin 34 so that the floor plate lower part 31d always approaches the outer box 83. In other words, the floor plate part 31 will not rotate so that the floor plate lower part 31d moves away from the outer box 83 unless a torque exceeding the force of the two torsion springs 36 pressing the floor plate part 31 is applied. Therefore, in the floor plate storage position, the lower end of the floor plate portion 31 rotates inward, thereby always approaching the vertical outrigger box 82. In addition, in the floor plate installation position, the tip of the floor plate portion 31 is pushed in a direction that bounces upward, so that the position of the floor plate portion 31 becomes horizontal by balancing with the weight of the floor plate 30 itself.

[0042] (Receiving bracket part) The receiving metal part 35 includes two reinforcing plate parts 35a and one rod part 35b. The reinforcing plate portion 35a is formed in a U-shaped plate shape when viewed in the thickness direction of the floor plate portion 31. In addition, the two reinforcing plate portions 35a are each arranged around the floor plate side cutout portion 31c when viewed in the thickness direction of the floor plate portion 31, and are fixed to the inner surface of the floor plate portion 31 by welding or the like. As a result, the reinforcing plate portion 35a functions as a member that reinforces the portion of the floor plate portion 31 where the floor plate-side cutout portion 31c is formed.

[0043] The rod portion 35b is formed in a cylindrical shape with a diameter of, for example, about 8 mm. Moreover, the rod portion 35b is fixed to the two reinforcing plate portions 35a by welding, etc. Specifically, one rod portion 35b is fixed to the two reinforcing plate portions 35a formed in a U-shape at a position where a total of four parallel sides are continuous. The position at which the rod portion 35b is fixed to the two reinforcing plate portions 35a is a position that ensures a gap in the floor plate side cutout portion 31c.

[0044] (Outer guide mechanism) As shown in Figures 4, 5 and 8-2(e), the outer guide mechanism 4 includes an outer bracket 41, a pair of bosses 42, and a pair of sliding plates 43. Note that Figure 8 shows the floor plate installation device 1 as viewed from the front side. The outer bracket 41 includes a pair of sliding plate attachment portions 41a and a connecting plate portion 41b. The sliding plate attachment parts 41a are formed in a trapezoidal plate shape when viewed from the front or rear. The pair of sliding plate attachment parts 41a are disposed on the inside of the surface of the outer box 83 viewed from the front and the surface of the outer box 83 viewed from the rear, respectively, at the lower end side of the outer box 83. The sliding plate attachment parts 41a are fixed to the outer box 83 by, for example, welding.

[0045] The connecting plate portion 41b is formed in a plate shape and is disposed facing the outer surface of the outer box 83. The connecting plate portion 41b also connects the pair of sliding plate attachment portions 41a. The connecting plate portion 41b is further fixed to the outer box 83 by, for example, welding. The pair of bosses 42 are formed in a cylindrical shape. The pair of bosses 42 protrude forward and rearward, respectively, from the pair of sliding plate attachment portions 41a at positions lower than the portions connected by the connecting plate portions 41b.

[0046] The sliding plate 43 is made of a synthetic resin material such as "CN-NB". The pair of sliding plates 43 are disposed above the bosses 42 with respect to the pair of sliding plate attachment portions 41a, respectively. In addition, the pair of sliding plates 43 are formed into a rectangular plate shape when viewed from the front or rear, and are fixed to the sliding plate mounting portion 41a, for example, by screws, in an orientation in which the longitudinal direction faces downward from the outside to the inside when viewed from the front or rear. Furthermore, each of the pair of sliding plates 43 has an arm contact surface 43a and an inclined surface 43s, as shown in FIG. 7 and FIG. 9(b). The arm contact surface 43a is in contact with the surfaces of the pair of arm plates 21 that face each other. The inclined surface 43s is formed below the arm contact surface 43a, and is inclined downward as it moves away from the arm plate 21.

[0047] (Ground side guide mechanism) As shown in Figures 4, 5 and 10(a), the ground side guide mechanism 5 includes a ground side bracket 51, a pair of cams 52, a pair of bolts 53, and a pipe 54. Note that Figure 10(a) shows a part of the vertical outrigger box 82 in the floor plate installation position and the entire floor plate installation device 1 as viewed from the front side. The ground side bracket 51 is disposed in a position facing the outer box 83 when the base plate portion 31 is in the base plate storage position. The ground side bracket 51 also includes an attachment plate portion 51a and a pair of protruding plates 51b.

[0048] The mounting plate portion 51a is formed in a C-shape in a plan view. The mounting plate portion 51a has its opening facing outward and is fixed onto the float 85 by welding or the like with a part of the inner box 84 sandwiched between the opening side. Therefore, the ground side bracket 51 is disposed at a position of the float 85 facing the outer box 83 when the base plate portion 31 is in the base plate storage position.

[0049] The pair of protruding plates 51b are formed in a shape that protrudes upward from the front and rear ends of the mounting plate portion 51a, respectively. The protruding plates 51b are formed, for example, by bending or welding. Further, the protruding plates 51b are formed with through holes (not shown) for inserting the bolts 53. Furthermore, a protrusion (not shown) that protrudes toward the arm 20 is formed on a portion of the protruding plate 51b that faces the arm 20 in order to prevent the arm 20 from coming off the pair of protruding plates 51b.

[0050] As shown in Figures 9(a) and 9(b), the pair of cams 52 are each formed into a cylindrical shape. Figure 9(a) shows the vertical outrigger box 82 in the floor plate storage position and a part of the floor plate installation device 1 as viewed from the front side. Figure 9(b) is a side view of the part of Figure 9(a). Further, each of the pair of cams 52 is formed with an adjustment hole 52a and a bolt hole 52b.

[0051] The adjustment hole 52a is formed on the outer diameter surface of the cam 52 at a position disposed between the arm 20 and the ground side bracket 51 when the cam 52 is viewed in the radial direction. The adjustment hole 52a is a recess formed so as to be recessed toward the central axis of the cam 52, and is, for example, a drilled hole formed using a drill or the like. The depth of the adjustment hole 52 a is set to a depth that does not reach the central axis of the cam 52 , for example. The cross-sectional shape of the adjustment hole 52a may be, for example, a regular hexagon.

[0052] The bolt hole 52b is a hole into which the bolt 53 is inserted in order to fix the cam 52 to the ground side bracket 51. Moreover, the bolt hole 52b is formed at a position eccentric to the central axis of the cam 52 when viewed from the axial direction of the cam 52 (front or rear). The position at which bolt hole 52b is offset from the central axis of cam 52 is set at a position that allows adjustment of the gap between cam 52 and boss 42 when vertical outrigger box 82 is in the most contracted state by rotation of cam 52. The reason for setting the position of bolt hole 52b will be described later.

[0053] In addition, the pair of cams 52 are fixed to the convex plate 51b by inserting a bolt 53 into the through hole and the bolt hole 52b from the outside of the convex plate 51b, with the bolt hole 52b overlapping the through hole of the convex plate 51b on the inside of the convex plate 51b. Therefore, the cam 52 is fixed to the ground side bracket 51 by using the bolt 53 inserted into the bolt hole 52b.

[0054] The bolt 53 is, for example, a bolt having a hexagonal socket formed in the head and a male screw formed on the outer diameter surface. The male thread of the bolt 53 is formed as a right-handed male thread when the surface where the cam 52 and the arm 20 contact is located to the left of the central axis of the cam 52 when viewed from the front-to-rear direction of the crane-mounted vehicle 100 in the sole plate storage position. In this case, a right-handed female thread is formed on the inner diameter surface of the bolt hole 52b into which the bolt 53 with a right-handed male thread is inserted. On the other hand, when the surface where the cam 52 and the arm 20 contact each other is located to the right of the central axis of the cam 52 when viewed from the front-rear direction of the crane-mounted vehicle 100 in the floor plate storage position, a left-handed male thread is formed as the male thread of the bolt 53. In this case, a left-handed female thread is formed on the inner diameter surface of the bolt hole 52b into which the bolt 53 having a left-handed male thread is inserted.

[0055] The pipe 54 is fixed to the pair of protruding plates 51b by welding or the like with its longitudinal direction facing the front-rear direction. Here, in order to make it possible to hold the floor plate unit 2 on the float 85 in a stable state, the arm mounting pin 34 is formed so that the movable range within which the floor plate part 31 can rotate with respect to the arm 20 is, for example, an angle shown by "α" in Fig. 10(b). Fig. 10(b) is a diagram showing a state in which the floor plate part 31 is horizontal with respect to the float 85 when the floor plate unit 2 is placed on the cam 52 and the second cushion 8.

[0056] The angle α is the difference in angle between the floor plate portion 31 in the state shown in Figure 10(b), i.e., when viewed from the side, horizontal to the float 85, and the state shown in Figure 10(c), i.e., when the floor plate portion 31 is inclined to the float 85. 10(c) is a diagram showing a state in which the floor plate unit 2 is placed on the cam 52 and the second cushion 8, and the floor plate part 31 rotates and is inclined with respect to the float 85. In addition, in Fig. 10(b) and Fig. 10(c), the center of rotation of the floor plate part 31 relative to the arm 20 is indicated by the symbol CG. In the embodiment, as an example, a case where the angle α is set to about 11° will be described. This is because the movable range in which the floor plate part 31 can rotate with respect to the arm 20 is an angle at which the center of gravity of the floor plate part 31 is located between the pipe 54, which serves as the fulcrum of the arm 20, and the cam 52 in a state in which the floor plate part 31 is located on the float 85 via the arm 20.

[0057] (locking mechanism) The locking mechanism 6 is a mechanism for fixing the floor plate part 31 to the outer box 83 by fixing the receiving metal part 35 to the outer box 83 when the floor plate part 31 is in the floor plate storage position. In other words, the locking mechanism 6 is a mechanism capable of fixing the floor plate part 31 to the outer box 83 when the position of the floor plate part 31 is in the floor plate storage position. The locking mechanism 6 also has a main mechanism and a sub mechanism. As a result, the locking mechanism 6 has redundancy due to the dual mechanisms (main mechanism and sub mechanism), and is configured to prevent the floor plate 30 from falling while the crane-mounted vehicle 100 is traveling.

[0058] The main mechanism of the lock mechanism 6 includes a snatch lock 60, as shown in FIGS. The snatch lock 60 has two levers 61 . The two levers 61 are constantly subjected to a force by a tension spring (not shown) in a direction in which the snatch lock 60 is closed. The force applied by the tension spring to the lever 61 is set to, for example, about 2 kgf. This is to prevent the snatch lock 60 from being released against the intention of the operator by applying a force to the lever 61 in a direction in which the snatch lock 60 is closed by the tension spring. One end of the tension spring is attached to the lever 61, and the other end is attached to a bolt (not shown) that fixes the snatch lock 60. In order to prevent a moment force from being generated on the lever 61 around the bolt to which the other end of the tension spring is attached, the attachment position to the bolt is set so that the vector of the force generated by the tension spring passes near the center of the bolt. A claw portion (not shown) is formed on each of the two levers 61. The two levers 61 are operated simultaneously.

[0059] The claw portion is formed in a shape (for example, a hook shape) that can grip the outer diameter surface of the rod portion 35b. As shown in Figure 3, when the lever 61 is closed in the floor plate storage position, the claw portion of the lever 61 contacts the rod portion 35b to fix the rod portion 35b, thereby restricting displacement of the floor plate portion 31 in the direction in which the position of the floor plate portion 31 changes to the floor plate installation position.

[0060] When releasing (unlocking) the fixation of the base plate portion 31 by the snatch lock 60, the lever 61 is opened, causing the claw portion to separate from the rod portion 35b, releasing the rod portion 35b, and allowing the position of the base plate portion 31 to be displaced in the direction of changing to the base plate installation position. That is, when the position of the floor plate part 31 is the floor plate storage position, the snatch lock 60 provided in the locking mechanism 6 can be operated to lock the rod part 35b with the claw part, thereby fixing the floor plate part 31 to the outer box 83. In the following description, the state in which the floor plate part 31 is fixed to the outer box 83 may be referred to as the "locked state."

[0061] As a result, the receiving metal part 35 having the rod part 35b functions as a component for locking the floor plate part 31 to the side surface of the outrigger 80 in the floor plate storage position. By configuring the snatch lock 60 to have two levers 61, even if one of the levers 61 breaks down due to damage to the claw portion, the other lever 61 can fix the base plate portion 31. This provides redundancy to the snatch lock 60, which is the main mechanism.

[0062] The sub-mechanism of the lock mechanism 6 includes a sub-lock spring 63, a release grip 64, and a lock member 65, as shown in, for example, FIGS. The sub-lock spring 63 is formed, for example, by using a coil spring. One end of the sub-lock spring 63 is attached to a striker bracket (not shown) fixed to the outer box 83. The release grip 64 is formed using a plate material, and the other end of the sub-lock spring 63 is attached thereto.

[0063] The locking member 65 can slide in accordance with the expansion and contraction of the sub-lock spring 63. In addition, the distance by which the locking member 65 can slide is set to, for example, a distance (13 mm) obtained by adding a margin (5 mm) to the diameter (8 mm) of the rod portion 35b. Furthermore, with the above-mentioned configuration, the sub-mechanism of the locking mechanism 6 can fix the floor plate portion 31 to the outer box 83 by inserting a part of the locking member 65 between the floor plate portion 31 and the rod portion 35b. The sub-mechanism can release the locked state by sliding the locking member 65 upward and removing the part inserted between the floor plate portion 31 and the rod portion 35b from between the floor plate portion 31 and the rod portion 35b.

[0064] Therefore, by configuring the locking mechanism 6 to include a sub-mechanism in addition to the main mechanism, even if the main mechanism, the snatch lock 60, fails, the sub-mechanism can secure the base plate portion 31 to the outer box 83. As described above, when the floor plate portion 31 is fixed by the locking mechanism 6, the floor plate portion 31 maintains the floor plate storage position even if the vertical outrigger box 82 performs an extending operation.

[0065] (First cushion) The first cushion 7 is formed into a cube using an elastic material such as rubber. The first cushion 7 is attached to the outer box 83 at a position that comes into contact with the floor plate lower portion 31d when the outer box 83 is in the floor plate storage position. Therefore, the first cushion 7 forms a shock-absorbing member arranged at a position in contact with the floor plate portion 31 on the surface of the outer box 83 facing the floor plate portion 31 when the floor plate portion 31 is in the floor plate storage position. In addition, the first cushion 7 has a function of reducing collision noise that occurs when the floor plate portion 31 comes into contact with the outer box 83 when the floor plate 30 is stored.

[0066] (Second cushion) The pair of second cushions 8 are formed into a cube using an elastic material such as rubber. The height of the second cushions 8 is lower than the cam 52 and the pipe 54. The front second cushion 8f, which is one of the pair of second cushions 8, is attached between the cam 52 and the pipe 54 at a position close to the protruding plate 51b located at the front of the attachment plate portion 51a. The rear second cushion 8r, which is the other of the pair of second cushions 8, is attached between the cam 52 and the pipe 54 at a position of the attachment plate portion 51a close to the protruding plate 51b located at the rear. The pair of second cushions 8 also have a function of reducing collision noise generated by contact of the floor plate portion 31 with the arm 20 when the floor plate 30 is installed. Specifically, the pair of second cushions 8 are disposed at positions where the cutout portion 24 comes into contact with the floor plate portion 31 before the cutout portion 24 comes into contact with the pipe 54 when the floor plate 30 is installed. In addition, the pair of second cushions 8 are formed into a shape where the cutout portion 24 comes into contact with the floor plate portion 31 before the cutout portion 24 comes into contact with the pipe 54 when the floor plate 30 is installed.

[0067] <Reason for Setting the Position of the Bolt Hole 52b> The reason why the configuration is capable of adjusting the gap between the cam 52 and the boss 42 when the vertical outrigger box 82 is in the most retracted state is as follows. Since the cam 52 determines the storage position of the floor plate part 31 via the arm 20, the relative position of the cam 52 and the boss 42 is important when the vertical outrigger box 82 is in the most retracted state. For this reason, it is necessary to have a configuration that allows the storage position of the floor plate part 31 to be adjusted when the storage position of the floor plate part 31 changes due to assembly errors or wear that occurs with use.

[0068] Therefore, by adjusting the rotational position of the cam 52 relative to the arm 20 in the floor plate storage position, the gap between the cam 52 and the boss 42 can be adjusted, and the contact state between the arm 20 and the cam 52 can be adjusted. Note that the "contact state between the arm 20 and the cam 52" ​​includes a state in which the arm 20 and the cam 52 are in contact with each other, and a negative contact state in which the arm 20 and the cam 52 are not in contact with each other. Therefore, the "contact state between the arm 20 and the cam 52" ​​also includes a state in which a gap is formed between the arm 20 and the cam 52. Furthermore, by adjusting the cam 52, the floor plate portion 31 is set to a preset position before it reaches the floor plate storage position. The preset position before the floor plate storage position is set to, for example, a position in which the angle between the outer box 83 and the floor plate portion 31 is 30° when viewed from the front or rear.

[0069] <Adjusting the preset position before reaching the stowing position> The preset posture before the floor plate storage posture is reached is a posture according to the contact state between the arm 20 and the cam 52. Therefore, the preset posture before the floor plate storage posture is reached is adjusted by setting the distance (gap) between the cam contact surface 26 and the cam 52 in the floor plate storage posture (locked state) to an appropriate value.

[0070] Here, the "appropriate value" is, for example, a value that realizes the set angle of the floor plate 30 when the preset attitude before the floor plate storage attitude is reached is set to an angle that allows the worker to easily recognize the inclination of the floor plate 30. Also, the gap between the cam contact surface 26 and the cam 52 in the floor plate storage attitude can be adjusted, for example, as shown in Fig. 11, by sandwiching a shim SH having an appropriate thickness in the gap between the cam contact surface 26 and the cam 52 in the floor plate storage attitude. Then, the cam 52 can be fixed in a state of contact with the shim SH and adjusted. That is, the contact state between the arm 20 and the cam 52 is adjusted by sandwiching the shim SH between the arm 20 and the cam 52 in the floor plate storage position with the shim SH disposed between the arm 20 and the cam 52. The shim SH is formed, for example, using an iron plate material. Moreover, the shim SH is formed to a preset thickness. The preset thickness is a thickness according to the contact state between the arm 20 and the cam 52 in a preset position.

[0071] Furthermore, the pair of bosses 42 and the pair of cams 52, and the tip portions 21D of the pair of arm plates 21 sandwiched between the pair of bosses 42 and the pair of cams 52, are worn down by the rotation of the pair of arm plates 21. This causes a change in the gap between the cam contact surface 26 and the cam 52. Therefore, due to the change in the gap between the cam contact surface 26 and the cam 52, the preset posture before the floor plate storage posture is reached may no longer be the normal posture. In this case, as shown in Fig. 9(b), the ground contact side guide mechanism 5 of the embodiment can increase or decrease the gap between the cam contact surface 26 and the cam 52 by rotating the cam 52 fixed by the bolt 53 at an eccentric position and changing the position at which the cam 52 is fixed. That is, after changing the fixing positions of the pair of cams 52 with each bolt 53 loosened, it is possible to adjust the gap between the cam contact surface 26 and the cam 52 to an appropriate distance by tightening and fixing each bolt 53. Note that adjustment due to assembly errors during manufacturing can also be performed in the same manner as when adjusting the gap between the cam contact surface 26 and the cam 52 that has changed due to wear.

[0072] <Fixing the cam> A method for fixing the cam 52 to the ground side bracket 51 will be described. Before the cam 52 is fixed to the ground side bracket 51, the base plate portion 31 is fixed to the outer box 83 by the locking mechanism 6, and the ground side bracket 51 is fixed on the float 85. Furthermore, before the cam 52 is attached to the ground side bracket 51, the vertical outrigger box 82 is extended to a length that allows the cam 52 to be handled by the operator.

[0073] Hereinafter, a method for fixing the cam 52 having a right-handed female thread formed on the inner diameter surface of the bolt hole 52b of the pair of cams 52 to the ground side bracket 51 will be described. Note that the method for fixing the cam 52 having a left-handed female thread formed on the inner diameter surface of the bolt hole 52b to the ground side bracket 51 is similar except that the directions in which the bolt 53 and the cam 52 are rotated are opposite, so description and illustration thereof will be omitted. First, the cam 52 is temporarily fixed to the ground side bracket 51 using the bolt 53. At this time, the attitude of the cam 52 is adjusted so that the distance (gap) between the outer diameter surface of the cam 52 and the cam contact surface 26 is maximized.

[0074] After that, the vertical outrigger box 82 is brought into the most retracted state. In this state, the shim SH is inserted into the gap formed between the cam 52 and the cam contact surface 26, and the bolt 53 is rotated in the right direction (the "clockwise direction" shown in FIG. 11) to tighten the bolt 53 to the cam 52 and the ground side bracket 51. As described above, the thickness of the shim SH is a thickness according to the contact state between the arm 20 and the cam 52 in a preset position, and is the same as the appropriate value of the gap formed between the cam 52 and the cam contact surface 26. Note that the appropriate value of the gap is, for example, the distance (gap) between the cam 52 and the cam contact surface 26 for realizing a preset position before the floor plate storage position is reached.

[0075] When the bolt 53 is rotated to the right in the operation of tightening the bolt 53 to the cam 52 and the ground side bracket 51, the cam 52 rotates to the right in the same manner as the bolt 53 due to the frictional force generated in the female thread formed on the inner diameter surface of the bolt hole 52b. Then, when the bolt 53 and the cam 52 continue to rotate to the right, the cam 52 and the cam contact surface 26 sandwich the shim SH without any gap, and the bolt 53 and the cam 52 stop rotating. This is because the position of the bolt hole 52b, which is the center position for fixing the cam 52 to the ground side bracket 51, is eccentric from the central axis of the cam 52, and therefore the gap between the cam 52 and the cam contact surface 26 decreases as the bolt 53 and the cam 52 are rotated to the right. When the cam 52 and the cam contact surface 26 are sandwiching the shim SH and the rotation of the bolt 53 and the cam 52 is stopped, if the bolt 53 is further rotated in the right direction, there is no room for the cam 52 to rotate, so a fastening force is generated in the bolt 53, and the fixation of the cam 52 is completed.

[0076] After the cam 52 has been fixed to the ground side bracket 51, the vertical outrigger box 82 is extended, and the shim SH is removed from between the cam 52 and the cam contact surface 26. In the above-mentioned method, if the cam 52 does not rotate due to frictional force and it is difficult to adjust the gap between the cam 52 and the cam contact surface 26, a tool such as a hexagonal wrench can be inserted into the adjustment hole 52a and the cam 52 can be forcibly rotated using the tool. This makes it possible to adjust the gap between the cam 52 and the cam contact surface 26.

[0077] <Cam adjustment mechanism> As described above, the cam adjustment mechanism used in the floor plate installation device 1 is a mechanism that adjusts the contact state of the cam 52 with the arm 20 in the floor plate installation device 1. In the embodiment, the cam adjustment mechanism adjusts the rotational position of the cam 52 relative to the arm 20 in the floor plate storage position, thereby adjusting the contact state between the arm 20 and the cam 52 in the floor plate storage position. This adjusts the preset position.

[0078] <How to adjust the cam> As described above, the cam adjustment method carried out using the cam adjustment mechanism is a method for adjusting the contact state of the cam 52 with the arm 20 of the floor plate installation device 1. In the embodiment, the cam adjustment method is used to place a shim SH formed to a preset thickness between the arm 20 and the cam 52 in the floor plate storage position, and then rotate the cam 52 to sandwich the shim SH between the arm 20 and the cam 52. This adjusts the contact state of the cam 52 with the arm 20.

[0079] <Operation> A: Floor plate stored Before describing the floor plate installation operation of the floor plate installation device 1, the floor plate storage state will be described first. In the floor plate storage state, as shown in Fig. 3, Fig. 4 and Fig. 8-1(a), the position of the floor plate part 31 is the floor plate storage position, and the floor plate part 31 is locked by the locking mechanism 6. Furthermore, the inner box 84 is in the most contracted state. That is, in the floor plate storage state, the floor plate part 31 is in a position arranged outside the outer box 83, and the floor plate part 31 is fixed to the outer box 83 by the locking mechanism 6.

[0080] In the floor plate storage state, the floor plate unit 2 is in a state where the boss 42 contacts the pocket portion 25a. In addition, the floor plate unit 2 is stored in a state where it is correctly positioned in the front-rear direction by one of the pair of arm plates 21 contacting the sliding plate 43. Furthermore, the floor plate unit 2 is in a state where the cam 52 is not in contact with the cam contact surface 26. Furthermore, in the floor plate stowing position, the connecting rod 28 is disposed inward of the vertical outrigger box 82. In addition, in the floor plate stowing position, the floor plate part 31 is disposed outward of the vertical outrigger box 82. Therefore, in the floor plate stowing position, the vertical outrigger box 82 is sandwiched between the connecting rod 28 and the floor plate part 31, and the floor plate unit 2 can be removed only when the float 85 is removed from the inner box 84. Therefore, even if a situation arises in which the floor plate unit 2 falls while driving due to damage to parts, etc., the arm 20 comes into contact with the float 85 and the ground side bracket 51, thereby reducing the possibility of the floor plate unit 2 falling off.

[0081] B: Preparation before installing the floor plate Next, preparations before installing the floor plates (hereinafter, sometimes referred to as "pre-installation preparations") will be described. First, in order to secure a space for the operation of placing the floor plate portion 31 between the float 85 and the ground, the outriggers 80 are extended outward. Here, in the locked state, since the floor plate portion 31 is fixed to the outer box 83, the floor plate portion 31 cannot be installed even if the inner box 84 is extended. Therefore, it is necessary to release the locked state as a preparation before installation. Therefore, by sliding the locking member 65 upward and opening the lever 61, as shown in FIG. 8-1(b), the rod portion 35b is released and the locked state by the locking mechanism 6 is released. By releasing the locked state, the floor plate unit 2 becomes separable from the outer box 83. This completes the pre-installation preparation.

[0082] The base plate portion 31 is set to a preset position by adjusting the cam 52 before reaching the base plate storage position. Therefore, when the posture of the floor plate section 31 is changed from the floor plate storage posture to the floor plate installation posture, as shown in Figures 7(b) and 8-1(b), the posture of the floor plate section 31 when the vertical outrigger box 82 is in the most contracted state becomes the preset posture before reaching the floor plate storage posture. In the pre-installation preparation, it is not essential to extend the outriggers 80 outward. That is, for example, if the space in which the crane-mounted vehicle 100 is used to perform work is narrow, the floor plate 30 is installed without extending the outriggers 80 outward. Therefore, the floor plate installation device 1 can be used even in situations in which it is difficult to extend the outriggers 80 outward.

[0083] C: Floor plate installation operation Next, the operation of installing the floor plate will be described. Although Figures 7 and 8 show the operation as viewed from the front, the operation as viewed from the rear is the same. When the inner box 84 is slightly extended after completing the pre-installation preparation, the pair of cams 52 move downward as shown in FIG. 7(c) and FIG. 8-1(c). As a result, the pair of arm plates 21, which were fixed by being sandwiched between the pair of bosses 42 and the pair of cams 52, are released at the tip end 21D. At this time, the floor plate portion 31 descends by its own weight with the extension of the vertical outrigger box 82 in a state in which the arm 20 is placed on the pair of cams 52. However, the boss 42 is in contact with the inner peripheral surface of the pocket portion 25a, and the arm 20 rotates around the pair of bosses 42 as the rotation axis in response to the descent of the pair of cams 52. That is, while the floor plate portion 31, which has a large mass, descends, the pair of arm plates 21 are pushed by the boss 42 so as to be lifted upward from the tip end 21D with the cam 52 as a fulcrum.

[0084] That is, as the pair of cams 52 descend, the pair of bosses 42 become the center of rotation, and the pair of arm plates 21 rotate due to the weight of the floor plate portion 31 while the pair of cams 52 support the pair of arm plates 21 from below. Then, the floor plate portion 31 gradually starts to move below the float 85. At this time, the pair of arm plates 21 descend from the tip end portion 21D with the cam contact surface 26 in contact with the cam 52.

[0085] Next, when the inner box 84 extends and the pair of arm plates 21 rotate until the base ends 21P are below the float 85 as shown in Fig. 7(d) and Fig. 8-2(d), the protrusion 22 enters between the pair of cams 52 and the pipe 54. At this time, the pocket portion 25a faces upward and is separated from the pair of bosses 42. In the following explanation, the position of the floor plate unit 2 in this state may be referred to as the "layout plate installation preparation position."

[0086] When the position of the floor plate unit 2 becomes the position for preparing to install the floor plate, the inner peripheral surface of the cutout portion 24 of each of the pair of arm plates 21 comes into contact with the outer peripheral surface of the pipe 54 from above. That is, the pair of arm plates 21 comes into a state of being placed on the pipe 54 from the base end portion 21P. In the embodiment, when the pair of arm plates 21 comes into a state of being placed on the pipe 54 from the base end portion 21P, the bottom surface of the protrusion portion 22 comes into contact with the upper surface of the second cushion 8 before the inner peripheral surface of the cutout portion 24 comes into contact with the outer peripheral surface of the pipe 54. That is, the second cushion 8 is designed to mitigate the impact when the inner peripheral surface of the cutout portion 24 comes into contact with the outer peripheral surface of the pipe 54. This makes it possible to reduce the metallic sound generated when the pipe 54 comes into contact with the inner peripheral surface of the cutout portion 24. Furthermore, the position of the notch 24 is set at a position where the inner peripheral surface of the notch 24 pinches the outer peripheral surface of the pipe 54 when the attitude of the floor plate part 31 changes from the floor plate storage attitude to the floor plate installation attitude. This makes it possible to prevent the arm 20 and the floor plate part 31 from falling off the ground side bracket 51 when they move while placed on the ground side bracket 51.

[0087] Furthermore, the mass of the floor plate unit 2 is ultimately supported at two points, the pair of cams 52 and the pipe 54. In addition, when the floor plate unit 2 is in the floor plate installation preparation position, the center of gravity of the floor plate part 31 is designed to be located directly below, between the cam 52 and the pipe 54. Therefore, the floor plate unit 2 is placed in a stable state directly below the float 85 by the weight of the floor plate part 31. Since the floor plate unit 2 comes into contact with the upper surface of the second cushion 8, the material of the second cushion 8 may be made sufficiently hard, and the mass of the floor plate unit 2 may be supported at three points by adding the reaction force of the second cushion 8 to the arm plate 21. In addition, the force of the two torsion springs 36 pressing the floor plate portion 31 makes the floor plate portion 31 horizontal in the same manner as the float 85 which is horizontal to the ground in the floor plate installation preparation position.

[0088] When the inner box 84 continues to expand, the floor plate unit 2 descends while remaining placed on the cam 52 and the second cushion 8 (in the floor plate installation preparation position) as shown in Fig. 8-2(e). At this time, the protrusions 22 are inserted between the pair of cams 52 and the pipe 54, so it is possible to prevent the floor plate unit 2 from shifting left or right and falling during the installation operation. As described above, the convex portion 26a is provided on the cam contact surface 26 at a position where the cam 52 comes into contact with the cam when the attitude of the floor plate portion 31 changes between the intermediate attitude and the floor plate storage attitude. In addition, the concave portion 26b is provided on the cam contact surface 26 at a position where the cam 52 comes into contact with the cam when the attitude of the floor plate portion 31 changes between the intermediate attitude and the floor plate installation attitude.

[0089] Subsequently, the floor plate unit 2 descends in the floor plate installation preparation position, so that the floor plate portion 31 comes into contact with the ground in a horizontal position. Thereafter, as shown in FIG. 8-2(f), the float 85 is placed on the floor plate portion 31 in conjunction with the movement of the inner box 84 extending. That is, the position of the floor plate portion 31 becomes the floor plate installation position. In the floor plate installation position, the protrusion portion 22 is separated from the pair of second cushions 8 and is in a state of being released upward from between the pair of cams 52 and the pipe 54. Also, in the floor plate installation position, the floor plate portion 31 comes into contact with the ground. When the floor plate unit 2 descends, the arm plate 21 is supported by the pipe 54, and furthermore, the center of gravity of the floor plate part 31 is located inside in the vehicle width direction from the pipe 54. Therefore, the arm plate 21 will not fall inward due to, for example, the weight of the floor plate unit 2 itself.

[0090] As described above, the protrusion 22 and the pair of protruding plates 51b overlap in the front-rear direction. That is, the protrusion 22 is sandwiched between the pair of protruding plates 51b from the outside, so that the arm 20 does not shift significantly in the front-rear direction to the extent that it comes into contact with the inner box 84. As described above, after the floor plate portion 31 is placed on the ground, the inner boxes 84 of the pair of left and right vertical outrigger boxes 82 can be simultaneously extended to jack up the vehicle body 101. This ensures stability during operation of the crane 105.

[0091] As described above, the outer side guide mechanism 4 and the ground side guide mechanism 5 correspond to the floor plate installation mechanism which displaces the floor plate section 31 so that the posture of the floor plate section 31 changes from the floor plate storage posture to the floor plate installation posture in conjunction with the extension of the vertical outrigger box 82. Moreover, one end of the arm 20 (the end on the base end 21P side) is rotatably attached to the surface of the floor plate part 31 that faces the float 85 in the floor plate installation posture.

[0092] D: Floor plate storage operation Next, the operation of storing the floor plate will be described. The operation of storing the floor plate is basically the reverse of the operation of installing the floor plate shown in FIG. That is, when the inner box 84 is contracted from the sole plate installation posture shown in FIG. 8-2(f), the float 85 rises together with the ground side bracket 51. As the float 85 rises, the pipe 54 comes into contact with the inner peripheral surface of the notch 24 from below. After that, the sole plate part 31 starts to rise in a posture horizontal to the ground with the pipe 54 as an axis, while the arm plate 21 descends from the tip part 21D, so that the bottom surface of the protrusion part 22 comes into contact with the upper surface of the second cushion 8. Next, the arm plate 21 is placed on the pair of cams 52. After that, the sole plate unit 2 moves upward with the pipe 54 and the pair of cams 52, or the combination of them and the pair of second cushions 8, placed thereon, and the sole plate part 31 is raised from the ground as shown in FIG. 8-2(e). That is, the posture of the sole plate unit 2 becomes a sole plate installation preparation posture.

[0093] 7(d) and 8-2(d), as the position of the float 85 approaches the position where the vertical outrigger box 82 is most contracted in conjunction with the operation of contracting the inner box 84, the inner circumferential surface of the pocket portion 25a comes into contact with the outer circumferential surfaces of the pair of bosses 42. Here, because the opening area of ​​the cutout portion 24 is sufficiently larger than the diameter of the bosses 42, it is possible to accommodate the bosses 42 inside the pocket portion 25a with ample space even if there is a misalignment in the left-right direction.

[0094] Furthermore, when the position of the float 85 reaches the position where the vertical outrigger box 82 is most retracted in conjunction with the operation of retracting the inner box 84, the thrust when retracting the inner box 84 is transmitted from the pair of cams 52 to the pair of arm plates 21. As a result, the pair of arm plates 21 are lifted from the base end portion 21P with the pair of bosses 42 as the fulcrum of rotation, and the floor plate portion 31 moves toward the storage position as shown in Figures 7(c) and 8-1(c). At this time, the pair of arm plates 21 rotate while the surface between the hook portion 25 and the protrusion portion 22 contacts the sliding plate 43. In addition, during the operation of contracting the inner box 84, when the vertical outrigger box 82 reaches its most contracted position and the attitude of the base plate portion 31 becomes a preset attitude, the arm 20 rotates with the cam 52 and the arm 20 (cam contact surface 26) in contact with each other.

[0095] At this time, for example, as shown in FIG. 12, the rotational direction of the torque acting on cam 52 due to the force received from rotating arm 20 coincides with the rotational direction of cam 52 when cam 52 and bolt 53 are rotated in the direction to tighten bolt 53. In FIG. 12, the rotation direction of the torque acting on the cam 52 due to the force received from the rotating arm 20 is indicated by the symbol "T1", and the rotation direction when the cam 52 is tightened by the bolt 53 is indicated by the symbol "T2".

[0096] Then, the operator or the like manually moves the base plate portion 31 so that the thickness direction of the base plate portion 31 is parallel to the left-right direction of the crane-mounted vehicle 100, thereby disposing the base plate portion 31 outside the outer box 83. At this time, the surface of the base plate portion 31 facing the outer box 83 comes into contact with the first cushion 7, and the rod portion 35b is pushed into the opening of the snatch lock 60, so that the snatch lock 60 automatically enters a locked state. As a result, the base plate portion 31 enters a base plate storage position. Furthermore, as shown in FIG. 8-1(a), the locking member 65 is slid downward to insert a part of the locking member 65 between the base plate portion 31 and the rod portion 35b, so that the base plate unit 2 enters a locked state. Here, the amount of protrusion of the first cushion 7 from the outer box 83 is set to a protrusion amount that prevents the floor plate portion 31 from contacting the pipe 54 when in the floor plate storage position. This makes it possible to suppress noise generated by contact between the floor plate portion 31 and the pipe 54, both of which are made of metal.

[0097] In the embodiment, a part of the hook part 25 is configured to be accommodated between the pair of protruding plates 51b when the position of the floor plate part 31 is the floor plate storage position. In addition, a clearance provided in the front-rear direction is set between the pair of protruding plates 51b and the hook part 25 in order to reliably accommodate a part of the hook part 25 between the pair of protruding plates 51b. Therefore, the floor plate unit 2 can move in the front-rear direction. That is, due to the clearance provided in the front-rear direction, a shift occurs in the pair of arm plates 21 in the front-rear direction every time the floor plate storage operation is performed, and there is a risk of a malfunction, such as, for example, it becoming difficult to fix the pair of arm plates 21 by the lock mechanism 6.

[0098] For this reason, in the embodiment, when the pair of arm plates 21 are misaligned in the front-rear direction due to the inclined surface 43s, the surface formed between the hook portion 25 and the protrusion portion 22 comes into contact with the inclined surface 43s before the outer box 83. Note that the state in which the surface formed between the hook portion 25 and the protrusion portion 22 comes into contact with the inclined surface 43s before the outer box 83 comes into contact with the inclined surface 43s due to the inclined surface 43s occurs, for example, in the state shown in FIG. 7(d). As a result, the pair of arm plates 21 are automatically positioned along the inclined surface 43s, so that the misalignment in the front-rear direction occurring in the pair of arm plates 21 during the floor plate storage operation is corrected. In addition, the pair of sliding plates 43 prevent the pair of arm plates 21 from coming into direct contact with the outer box 83, making it possible to prevent paint from peeling off due to contact of the arm plates 21 when the floor boards are stored.

[0099] Here, when changing from the floor plate installation preparation posture to the floor plate storage posture, the lower end of the floor plate part 31 is maintained in a constant posture without tilting outward due to the force of the two torsion springs 36 pushing the floor plate part 31. Normally, the lower part of the floor plate part 31 swings outward due to its own weight and centrifugal force while moving to the floor plate storage posture. After that, there is a risk of the floor plate part 31 coming into contact with the float 85 at a speed that is a combination of the speed at which the restoring force of the pendulum acts and the rotation speed acting on the floor plate part 31 with the rotation of the arm 20. However, the restoring force of the pendulum generated in the floor plate portion 31 is not generated by the force of the two torsion springs 36 pushing the floor plate portion 31. Therefore, the floor plate portion 31 comes into contact with the float 85 only due to the rotational speed acting on the floor plate portion 31.

[0100] As described above, the posture of the floor plate portion 31 changes in response to the extension and contraction of the vertical outrigger boxes 82. In addition, the outer-side guide mechanism 4 and the ground-side guide mechanism 5 correspond to a floor plate storage mechanism that changes the attitude of the floor plate section 31 from the floor plate installation attitude to the floor plate storage attitude as shown in the order of Figures 8-2(f), 8-2(e), 8-2(d), 8-1(c), and 8-1(b) in conjunction with the retraction of the vertical outrigger box 82. In addition, the floor plate storage mechanism that corresponds to the outer-side guide mechanism 4 and the ground-side guide mechanism 5 changes the attitude of the floor plate section 31 to a preset attitude before it reaches the floor plate storage attitude when the vertical outrigger box 82 is in the most retracted state as shown in Figure 8-1(b).

[0101] E: Extension operation when the floor plate portion 31 is not grounded Next, the extending operation of the vertical outrigger box 82 when the floor plate portion 31 is not in contact with the ground will be described. When the vertical outrigger box 82 is extended without the floor plate portion 31 being grounded, the floor plate unit 2 is locked and the inner box 84 is extended. At this time, as shown in FIG. 10(a), even if the inner box 84 is extended while the floor plate portion 31 is in the locked state, the floor plate portion 31 is fixed to the outer box 83 by the locking mechanism 6, so the floor plate portion 31 does not move and only the inner box 84 slides downward. That is, even if the pair of cams 52 move downward and the state in which the hook portion 25 is sandwiched by the pair of bosses 42 and the pair of cams 52 is released, the floor plate unit 2 is held with the floor plate portion 31 hanging from the outer box 83. Therefore, as shown in FIG. 10(b), the pair of arm plates 21 do not rotate along the pair of bosses 42. As a result, the floor plate installation operation is not performed, and the vertical outrigger box 82 is extended as usual.

[0102] As described above, the floor plate installation device 1 is a device that automatically positions the floor plate part 31, which is stored in a position facing the side surface of the outer box 83, under the float 85 by extending the inner box 84 downward from the stored position. In addition, with the floor plate part 31 positioned under the float 85, the device automatically stores the floor plate part 31 in a preset position before it reaches the stored position by contracting the inner box 84.

[0103] <Actions and Effects of the Embodiments> The cam adjustment mechanism of the embodiment can provide the following functions and effects. (1) The preset posture of the floor plate part 31 before it reaches the floor plate storage posture is a posture according to the contact state between the arm 20 and the cam 52, and is the contact state between the arm 20 and the cam 52. In addition, by adjusting the rotational position of the cam 52 relative to the arm 20 in the floor plate storage posture, it is possible to adjust the contact state between the arm 20 and the cam 52. Therefore, the cam adjustment mechanism can be used to change the attitude of the cam 52 when it is fixed to the ground side bracket 51, thereby adjusting the gap formed between the cam 50 and the arm 20.

[0104] As a result, even if the gap formed between the cam 52 and the arm 20 changes due to assembly errors or wear that occurs with the use of the outrigger 80, it is possible to adjust the gap formed between the cam 52 and the arm 20 to an appropriate value. This makes it possible to adjust the contact condition between the arm and the cam by adjusting the rotational position of the cam relative to the arm in the floor plate storage position, and allows the floor plate section 31 to be maintained in a constant position in a pre-set position before reaching the floor plate storage position.

[0105] (2) The cam 52 has a bolt hole 52b into which a bolt 53 for fixing the cam 52 to the ground side bracket 51 is inserted. In addition, the female thread formed in the bolt hole 52b and the male thread formed in the bolt 53 are right-handed threads when the surface where the cam 52 and the arm 20 contact is located to the left of the central axis of the cam 52 when viewed from the front-rear direction of the crane-mounted vehicle 100 in the floor plate storage position. In addition, the female thread formed in the bolt hole 52b and the male thread formed in the bolt 53 are left-handed threads when the surface where the cam 52 and the arm 20 contact is located to the right of the central axis of the cam 52 when viewed from the front-rear direction of the crane-mounted vehicle 100 in the floor plate storage position.

[0106] Therefore, the rotation direction when the bolt 53 is tightened coincides with the direction in which the cam 52 rotates when reducing the gap between the cam 52 and the arm 20, making it easy to adjust the gap between the cam 52 and the arm 20. In addition, during the operation of shrinking the inner box 84, the arm 20 rotates with the cam 52 and the cam contact surface 26 in contact with each other, so that the rotational direction of the torque acting on the cam 52 coincides with the rotational direction of the cam 52 when the cam 52 and bolt 53 are rotated in the direction of tightening the bolt 53.

[0107] As a result, the fastening force of bolt 53 against cam 52, which is generated when the attitude of floor plate section 31 changes from the floor plate installation attitude to the floor plate storage attitude, is in a direction that is strengthened by the torque acting on cam 52, resulting in a torque in a direction that tightens bolt 53. Therefore, it is possible for the female thread formed in bolt hole 52b and the male thread formed on bolt 53 to function as a lock against loosening of bolt 53. On the other hand, the direction in which cam 52 rotates due to torque in the direction tightening bolt 53 is the direction in which the gap between cam 52 and arm 20 increases, but as the fastening force of bolt 53 to cam 52 increases, the frictional force between cam 52 and ground side bracket 51 also increases. This makes it possible to suppress changes in the position at which cam 52 is fixed to ground side bracket 51.

[0108] (3) The cam 52 has a bolt hole 52b provided at a position eccentric to the central axis of the cam 52. In addition, the cam 52 is fixed to the ground side bracket 51 by using a bolt 53 inserted into the bolt hole 52b. Therefore, when fixing the cam 52 to the ground side bracket 51, the more the bolt 53 and the cam 52 are rotated in the direction in which the bolt 53 is tightened, the more the gap between the cam 52 and the cam contact surface 26 can be reduced.

[0109] As a result, when tightening the bolt 53 to the cam 52 and the ground side bracket 51, it is possible to reduce the gap between the cam 52 and the cam contact surface 26 simply by rotating the bolt 53 and the cam 52 in the direction in which the bolt 53 is tightened. As a result, when fixing the cam 52 to the ground side bracket 51, it is possible to adjust the gap formed between the cam 52 and the arm 20 to an appropriate value simply by rotating the bolt 53 and the cam 52 in the direction in which the bolt 53 is fastened.

[0110] Furthermore, as described above, when adjusting the gap formed between the cam 50 and the arm 20 using the shim SH, the bolt 53 and the cam 52 are simply rotated in the direction in which the bolt 53 is tightened, and the cam 52 and the cam contact surface 26 sandwich the shim SH. Therefore, when tightening the bolt 53 to the cam 52 and the ground side bracket 51, it is possible to reduce the gap between the cam 52 and the cam contact surface 26 simply by rotating the bolt 53 and the cam 52 in the direction in which the bolt 53 is tightened.

[0111] (4) An adjustment hole 52 a is formed as a recess extending toward the central axis of the cam 52 at a position on the outer diameter surface of the cam 52 between the arm 20 and the ground side bracket 51 . Therefore, for example, even if the cam 52 does not rotate due to frictional force and it is difficult to adjust the gap between the cam 52 and the cam contact surface 26, it is possible to insert a tool such as a hex wrench into the adjustment hole 52a and use the tool to forcibly rotate the cam 52. As a result, even in cases where it is difficult to adjust the gap between the cam 52 and the cam contact surface 26, it is possible to adjust the gap between the cam 52 and the cam contact surface 26.

[0112] The cam adjustment method according to the embodiment can provide the following functions and effects. (5) The contact state between the arm 20 and the cam 52 is adjusted by placing a shim SH formed to a preset thickness between the arm 20 and the cam 52 in the floor plate storage position, and then rotating the cam 52 to sandwich the shim SH between the arm 20 and the cam 52. In addition, the preset thickness is a thickness that corresponds to the contact state between the arm 20 and the cam 52 in the preset position. As a result, the work of adjusting the gap between the cam 52 and the arm 20 can be easily performed by inserting a shim SH into the gap between the cam 52 and the arm 20 and tightening the bolt 53 until the cam 52 is fixed.

[0113] This makes it possible to adjust the gap formed between the cam 52 and the arm 20 to an appropriate value even if the gap changes due to assembly errors or wear that occurs with the use of the outrigger 80. Therefore, by adjusting the rotational position of the cam relative to the arm in the floor plate storage position, it is possible to adjust the contact condition between the arm and the cam, and it is possible to maintain the preset position of the floor plate section 31 before it reaches the floor plate storage position in a constant position.

[0114] For example, if the rotation direction when tightening bolt 53 does not coincide with the direction in which cam 52 rotates when reducing the gap between cam 52 and arm 20, the more bolt 53 is turned in the tightening direction, the larger the gap between cam 52 and arm 20 will be. For this reason, in order to set the gap between cam 52 and arm 20 to an appropriate value, it is necessary to hold cam 52 so that it does not rotate together with bolt 53. Therefore, by matching the rotation direction when tightening bolt 53 with the direction in which cam 52 rotates when reducing the gap between cam 52 and arm 20, it is possible to improve the workability when adjusting the gap between cam 52 and arm 20. Furthermore, it is possible to improve the accuracy of the work of adjusting the distance (gap) between cam 52 and arm 20.

[0115] The outrigger 80 of this embodiment can provide the following actions and effects. (6) Equipped with a vertical outrigger box 82 and a floor plate installation device 1. Therefore, the cam adjustment mechanism can be used to change the attitude of the cam 52 when it is fixed to the ground side bracket 51, thereby adjusting the gap formed between the cam 50 and the arm 20. As a result, even if the gap formed between the cam 52 and the arm 20 changes due to assembly errors or wear that occurs with the use of the outrigger 80, it is possible to adjust the gap formed between the cam 52 and the arm 20 to an appropriate value. This makes it possible to adjust the contact condition between the arm and the cam by adjusting the position of the cam relative to the arm in the floor plate storage position, and it is possible to maintain the pre-set position of the floor plate section 31 before it reaches the floor plate storage position in a constant position.

[0116] <Modification> (1) In the embodiment, the floor plate portion 31 is configured to be disposed outside the outer box 83 in the floor plate storage state, but this is not limited to this. In other words, the floor plate portion 31 may be configured to be disposed inside the outer box 83 in the floor plate storage state. (2) In the embodiment, the plate installation device 1 is applied to a vehicle-mounted crane, but this is not limited to this. The plate installation device 1 may be applied to, for example, other cranes or other work vehicles such as aerial work platforms, as long as they are equipped with outriggers having a similar configuration.

[0117] (3) In the embodiment, the vertical outrigger box 82 is extended and retracted by being configured to include the outer box 83, the inner box 84, and an actuator, but the present invention is not limited to this. That is, for example, the configuration may be such that the inner box 84 is not included, and an extendable member of the actuator that extends and retracts the vertical outrigger box 82 substitutes for the inner box 84. When the actuator that extends and retracts the vertical outrigger box 82 is a hydraulic cylinder included in the vertical outrigger box 82 as in the embodiment, the rod of the hydraulic cylinder corresponds to the extendable member that substitutes for the inner box 84. In this case, it is preferable to further configure the configuration to include a rotation stopper for the rod. [Explanation of symbols]

[0118] 1 Outrigger floor plate installation device 2. Sole plate unit 4 Outer guide mechanism 5. Ground side guide mechanism 6 Locking mechanism 7 First Cushion 8 Second Cushion 20 Arm 21 Arm Plate 22 Protrusion 23 Bend part 24 Notch 25 Hook part 25a Pocket 26 Cam contact surface 26a Convex 26b Recess 27 Shaft hole 28 Connecting Rod 30 Bottom plate 31 Bottom plate part 31u top of bottom plate 31d Lower part of floor plate 31c Bottom plate cutout 31G ground plane 32 Bracket part 32h Bracket side cutout 33 Arm mounting base 34 Arm mounting pin 35 Receiving bracket 35a Reinforcement plate 35b Rod section 36 Torsion Spring 36a Coil section 37 Ground cushion 41 Outer bracket 42 Boss 43 Sliding plate 43a Arm contact surface 43s slope 51 Ground side bracket 51a Mounting plate 51b Convex plate 52 Cam 52a adjustment hole 52b Bolt hole 53 Volts 54 Pipe 60 Snatchlock 61 Lever 62 Guide Frame 63 Subrock Spring 64 Release Grip 65 Locking member 67 Striker bracket 80 Outrigger 81 Horizontal outrigger box 82 Vertical outrigger box 83 Outer Box 84 Inner Box 85 Float 91 Base Column 92 93 Boom 94 Hook 100 Crane-equipped vehicles 101 Vehicle body 102 Cargo Bed 103 Driver's cab 104 Chassis frame 105 Crane 106 Wire Rope SH Sim

Claims

1. A cylindrical outer box; an inner box that is inserted into the outer box from one end to form a vertical outrigger box together with the outer box and displaceable relative to the outer box; A base plate portion whose posture changes in response to the expansion and contraction of the vertical outrigger box; a floor plate installation mechanism that displaces the floor plate portion so that the attitude of the floor plate portion changes from a floor plate storage attitude in which a surface of the floor plate portion opposite to a surface that contacts the ground faces a side surface of the outer box to a floor plate installation attitude in which the floor plate portion is disposed between the inner box and the ground in conjunction with the operation of extending the vertical outrigger box; a floor plate storage mechanism that changes the attitude of the floor plate section from the floor plate installation attitude to the floor plate storage attitude in conjunction with the operation of the vertical outrigger boxes shrinking, and that sets the attitude of the floor plate section to a preset attitude before reaching the floor plate storage attitude when the vertical outrigger boxes are in the most contracted state; A float attached to the other end of the inner box; an arm having one end rotatably attached to a surface of the floor plate portion that faces the float in the floor plate installation position; a ground side bracket of the float disposed at a position facing the outer box when the bottom plate portion is in the bottom plate storage position; a cylindrical cam fixed to the ground side bracket and contacting the arm when the attitude of the floor plate portion changes from the floor plate storage attitude to the floor plate installation attitude, the cam adjustment mechanism being for adjusting the contact state of the cam with the arm when the attitude of the floor plate portion changes from the floor plate storage attitude to the floor plate installation attitude, the cam adjustment mechanism comprising: the preset attitude is an attitude according to the contact state, A cam adjustment mechanism in which the contact state can be adjusted by adjusting a rotational position of the cam relative to the arm in the floor plate storage position.

2. the cam has a bolt hole into which a bolt for fixing the cam to the ground side bracket is inserted, The cam adjustment mechanism of claim 1, wherein the female thread formed in the bolt hole and the male thread formed in the bolt are right-handed threads when the surface where the cam installed on the front side when viewed from the fore-and-aft direction of the vehicle on which the outrigger is mounted in the floor plate storage position and the arm contacts is located to the left of the cam's central axis, and are left-handed threads when the surface where the cam installed on the front side when viewed from the fore-and-aft direction and the arm contacts is located to the right of the cam's central axis.

3. 3. A cam adjustment mechanism as described in claim 1 or claim 2, wherein the cam has a bolt hole provided at a position eccentric to the central axis of the cam, and is fixed to the ground side bracket using a bolt inserted into the bolt hole.

4. A cam adjustment mechanism according to any one of claims 1 to 3, wherein an adjustment hole, which is a recess formed toward the central axis of the cam, is formed on the outer diameter surface of the cam at a position located between the arm and the ground side bracket.

5. A cylindrical outer box; an inner box that is inserted into the outer box from one end to form a vertical outrigger box together with the outer box and displaceable relative to the outer box; A base plate portion whose posture changes in response to the expansion and contraction of the vertical outrigger box; a floor plate installation mechanism that displaces the floor plate portion so that the attitude of the floor plate portion changes from a floor plate storage attitude in which a surface of the floor plate portion opposite to a surface that contacts the ground faces a side surface of the outer box to a floor plate installation attitude in which the floor plate portion is disposed between the inner box and the ground in conjunction with the operation of extending the vertical outrigger box; a floor plate storage mechanism that changes the attitude of the floor plate section from the floor plate installation attitude to the floor plate storage attitude in conjunction with the operation of the vertical outrigger boxes shrinking, and that sets the attitude of the floor plate section to a preset attitude before reaching the floor plate storage attitude when the vertical outrigger boxes are in the most contracted state; A float attached to the other end of the inner box; an arm having one end rotatably attached to a surface of the floor plate portion that faces the float in the floor plate installation position; a ground side bracket of the float disposed at a position facing the outer box when the bottom plate portion is in the bottom plate storage position; a cylindrical cam fixed to the ground side bracket and contacting the arm when the attitude of the floor plate portion changes from the floor plate storage attitude to the floor plate installation attitude, the cam adjustment method being for adjusting a contact state of the cam with the arm when the attitude of the floor plate portion changes from the floor plate storage attitude to the floor plate installation attitude, the cam adjustment method comprising: the preset attitude is an attitude according to the contact state, the contact state is adjusted by, in the sole plate storage position, placing a shim formed to a preset thickness between the arm and the cam, and rotating the cam to sandwich the shim between the arm and the cam; A cam adjustment method, wherein the preset thickness is a thickness that corresponds to a contact state between the arm and the cam in the preset position.

6. An outrigger mounted on a vehicle, a vertical outrigger box including a cylindrical outer box and an inner box inserted into the outer box from one end and displaced relative to the outer box, the vertical outrigger box expanding and contracting by displacing the inner box relative to the outer box; An outrigger comprising: a cam adjustment mechanism according to any one of claims 1 to 4.

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