JPS6214477B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle-type crane such as a truck crane equipped with a jib, and particularly to a storage device for the jib.

[Prior Art] Truck cranes and the like are generally equipped with a jib to assist the telescoping boom.
The jib is typically stored along the side or bottom of the boom when not in use.

However, if the jib is stored on the underside of the boom, the visibility from the operator's cabin will be poor during crane work, etc., and there will be a large gap between the boom and the vehicle body when the boom is in a laid down position when traveling. It is necessary to secure storage space for the jib. For this reason, the attachment position of the boom with respect to the vehicle body is inevitably high, resulting in a problem that the overall center of gravity is also located at a high position.

To avoid such problems, it is desirable to store the jib along the side of the boom.

By the way, when storing the jib on the side of the boom, if you try to rotate the jib sideways in a horizontal plane from the tip of the boom toward the rear, it will require a large working space on the side of the boom, so this is not recommended. do not have. In order to store the jib on the side of the boom in a small working space, it is advantageous to temporarily tuck the jib into the underside of the boom and then move the jib tucked into the underside to the side of the boom.

Moreover, the base end of the jib is generally pivoted on a shaft protruding from both sides of the tip of the boom, and is rotated around this shaft. It is easy to store it on the underside of the machine.

[Problems to be solved by the invention] However, once the jib is placed along the underside of the boom, if one attempts to move it to the side of the boom, this structure becomes extremely complex and the space required for the movement becomes large. It is expected that.

An object of the present invention is to provide a jib storage device for a vehicle-type crane that has a simple structure in which a jib placed along the lower surface of the boom is stored on the side of the boom, and requires a small space for movement.

[Means for Solving the Problems] The present invention provides a case in which the jib base end and the boom are provided at a pivot point between the two axes of the boom, and the tip side of the jib is rotated about the axis toward the rear of the lower surface of the boom. , a tilting mechanism that aligns the jib along the lower surface of the boom and deflects the jib so that the tip side of the jib protrudes from one side of the boom; a base member having a guide groove extending to the side; an elevator provided to be movable up and down along the guide groove of the base member; and a rotatable rotating bracket having one end pivotally supported by the elevator. a first connecting bracket provided at the proximal end of the jib and removably connected to the rotating bracket when the jib approaches the lower surface of the boom and is in an deviated position; and a proximal end of the boom. a fixed bracket provided on one side; and a fixed bracket provided on the tip side of the jib, which is removably engaged with the fixed bracket when the jib approaches the lower surface of the boom and protrudes from one side of the boom. a second connecting bracket that engages the distal end of the jib so that it can rotate in the same direction as the rotating bracket about the fixed bracket; and a second connecting bracket that is connected to the other end of the rotating bracket to rotate the rotating bracket. It is characterized by being equipped with a pulling mechanism that rotates the jib and pulls it upward.

[Function] According to the present invention, when the jib is placed along the lower surface of the boom, the tip end of the jib is deviated so as to protrude from one side of the boom due to the action of the tilting mechanism, and in this deviated position, the first connecting bracket is and a second connecting bracket can be connected to the pivot bracket and the fixed bracket, respectively, thereby allowing the pivot brackets to be pivotally supported relative to the base member and the second coupling bracket relative to the fixed bracket. Therefore, the jib can be rotated with respect to the boom by the pulling mechanism so as to follow the side of the boom with a small rotation radius. After this, when the jib is further pulled up by the pulling mechanism, the rotating bracket is raised along the base member, so that the proximal end of the jib falls within the side height of the boom and does not protrude significantly.

[Embodiment of the Invention] An embodiment of the present invention will be described below based on the drawings.

Figure 1 shows the entire vehicle-type crane, in which 1 is the vehicle body, 2 is the swivel table, 3 is an extendable boom, 4 is the undulating cylinder of this boom 3, and 5 is used for both traveling and crane operation. This is the driver's cabin.

As shown in FIG. 1, a jib 7 is housed and supported on one side surface 3a of the boom 3 along this one side surface 3a. The base end of the jib 7 is pivotally supported on a shaft at the tip of the boom 3, and the jib 7 is rotated about this shaft to extend and store the jib 7. That is, as shown in FIG. 2, 10a and 10b are shafts that protrude from both sides of the tip 3b of the boom 3, and 11a and 11b are shafts that are formed at the base end of the jib 7 and extend from both sides. These are fork recesses that are removably fitted into the shafts 10a and 10b, respectively. Note that reference numerals 12 and 12 are pin holes for the retaining pins.

A tilting mechanism 13 is provided at the pivot points between the fork recesses 11a, 11b and both shafts 10a, 10b. In the case of this embodiment, this tilting mechanism 13 has a distance l ₁ between the pin hole 12 of the fork recess 11a and the bottom surface of the recess than a distance l 2 of the other fork recess 11b in the fork recess 11a on the one side surface _3a side. The fork recess 11a is movably pivoted to the shaft 10a thereof. Therefore, according to the above-mentioned configuration of the pivot portion, when the jib 7 is rotated backward along the lower surface of the boom 3 from the extended state, one of the fork recesses 11a becomes movable relative to the shaft 10a. Since the jib 7 is pivotally mounted, the jib 7 is pushed against one side 3a of the boom 3 by its own weight, as shown in FIG.
It is tilted to the side, and in this tilted position, it is close to the lower surface of the boom 3, and its tip side protrudes from the one side surface 3a. Note that 14 is a relief portion of the shaft 10b formed in the other fork recess 11b. The above-mentioned rotation procedure of the jib 7 is the same as the conventional one, and 15 in Fig. 3 is the auxiliary winding wire of the crane;
16 is a stop for this auxiliary winding wire 15, and 17,
Reference numeral 17 indicates the retaining pin.

Thus, the jib 7, which is brought close to the lower surface of the boom 3 as described above, is connected to the boom 3 at its proximal end and distal end, respectively.
Moreover, these support structures allow the boom 3 to be pulled up from the bottom surface to one side 3a thereof as shown in FIG. 1 and stored therein.

That is, first of all, looking at the tip side of the boom 3, the supporting structure of the jib 7 is shown in detail in FIGS. 4 to 6, and 18 in FIG. 4 is a base member.
This base member 18 is provided protrudingly provided on one side surface 3a on the distal end side of the boom 3. For example, the base member 18 is constituted by a pair of plates 19, 19 spaced apart from each other in the axial direction of the boom 3.

The base member 18 is provided with guide grooves 20, 20. These guide grooves 20, 20 are formed on both plates 19, 19 to face each other, and are in the form of long grooves formed vertically from the lower surface side of the boom 3 toward the upper surface side.

The base member 18 is provided with, for example, a lift shaft 21 as a lift. This elevating shaft 21 straddles between the plates 19, 19, and its both ends are slidably fitted into the guide grooves 20, 20, so that the elevating shaft 21 can move up and down along the guide grooves 20, 20. It's summery.

A rotating bracket 22 is attached to the lifting shaft 21. The rotating bracket 22 is formed of a substantially triangular plate, and one corner on one end of the rotating bracket 22 enters between the plates 19 and is pivotally connected to the lifting shaft 21. In other words,
The rotating bracket 22 is rotatable about the elevating shaft 21 in a direction perpendicular to the one side surface 3a.

In addition, as in the case of this embodiment, the above-mentioned lifting shaft 2
1 is parallel to the one side 3a, the rotating bracket 22 may be integrally connected to the lifting shaft 21.

For example, a lifting wire 2 of a winch 23 is installed at the upper center of the rotating bracket 22 as a lifting mechanism.
4 are connected to each other, and the rotating bracket 22 can be raised and lowered by this winch 23. The winch 23 is attached to one side 3a of the boom 3 as shown in FIG. There is.

On the other hand, on the jib 7 side, a first connecting bracket 26 is provided protruding from one side of the proximal end thereof, and these first connecting brackets 26 have connecting pins 27, 27 on the other end side of the rotating bracket 22. It is now possible to connect via Therefore, according to the above configuration, it is possible to lower the rotating bracket 22 to the lower surface of the boom 3 and connect it to the jib 7 close to the lower surface of the boom 3, as shown by the imaginary line in FIG. Then, by winding up the lifting wire 24 of the winch 23, the jib 7 can be pulled up from the lower surface of the boom 3 along one side 3a thereof. In addition, 28 is the base member 18
This is a guide roller for pulling up the jib 7 provided at the lower part of the jib 7.

Furthermore, the support structure of the jib 7 on the base end side of the boom 3 is shown in FIGS. It protrudes from the lower part of one side surface 3a on the end side. The fixed bracket 29 includes a tubular bearing portion 30, the axis of which is set along the one side surface 3a.

On the other hand, a second connection bracket 31 is provided on the distal end side of the jib 7. This second connection bracket 31 is constructed by attaching an engagement shaft portion 33 to the tip of an arm portion 32, and this engagement shaft portion 33 has a structure in which the jib 7 is attached to the boom 3 as shown by the imaginary line in FIG. When approaching the lower surface of the bearing part 3 of the fixed bracket 29,
0 so as to be rotatably fitted. In other words, the distal end side of the jib 7 is supported so as to be rotatable around the engagement shaft portion 33.

According to such an embodiment, when the jib 7 is brought close to and aligned with the lower surface of the boom 3, the engagement shaft portion 33 of the second connection bracket 31 is moved by utilizing contraction of the boom 3, etc. is fitted into the bearing portion 30 of the fixed bracket 29, and the first connecting bracket 26 and the rotating bracket 22 are connected to the connecting pin 27,
27 to connect them to each other, thereby supporting the jib 7 on the boom 3 side as shown in phantom lines in FIGS. 4 and 7. After this, the shaft 10
Fork recess 11 of jib 7 for a, 10b
Release the fitting between a and 11b. Next, after the boom 3 is slightly extended, the jib 7 is pulled up by the winch 23. Then, the jib 7 is guided to rotate about the engagement shaft portion 33, and the rotation bracket 22 is guided to rotate about the elevating shaft 21, so that the jib 7 takes a position along one side surface 3a of the boom 3.
Next, when the winch 23 is used to pull the jib 7 further up, the base end of the jib 7 is lifted by the lifting shaft 21 guided by the guide grooves 20, 20, and the jib 7 is raised from one side of the boom 3, as shown in FIG. It is stored and supported along 3a. Note that at this time, the auxiliary winding wire 15 shown in FIG. 3 has been removed from its stopper 16, and when the jib 7 is to be extended from the retracted state, the above operation must be performed in reverse. Needless to say, this is done by

Therefore, in the above embodiment, after the jib 7 is once supported on the lower surface of the boom 3, this jib 7 is attached to the boom 3.
Since it can be pulled up and stored on one side 3a, there is no need to secure storage space for the jib 7 between the bottom surface of the boom 3 and the car body 1, as shown by the imaginary line in FIG. By lowering the mounting position of the crane, the center of gravity of the entire crane can be lowered.

Further, since there is no jib 7 on the lower surface of the boom 3, the field of view from the operator's cab 5 is widened, and operations from the operator's cab 5 are facilitated during crane work. Moreover, in the case of this embodiment, since the driver's cab 5 also serves as a driver's cab for driving, there is an advantage that visibility during driving can be improved.

In addition, when the jib 7 is placed along the bottom surface of the boom 3, the tip side of the jib 7 is deflected so as to protrude to one side of the boom 3, so the first
The second connection brackets 26 and 31 can be connected to the rotation bracket 22 and the fixed bracket 29, respectively, and since these connection positions immediately become the center of rotation, the rotation radius of the jib 7 can be small, and the boom There is no longer a need for a large space on the bottom or side surfaces of 3 for rotation. That is, when the jib 7 is placed along the bottom surface of the boom 3 and the jib 7 is located on the center axis of the boom 3, the jib 7 and the corner of the boom 3, which is the rotation center of the jib 7, are separated by a large distance. , which causes the problem that the turning radius becomes larger,
If the jib 7 is deflected, this problem will not occur.

Since the jib 7 only needs to be rotated by 90 degrees, the wire 24 can be easily routed.

Furthermore, when the jib 7 is rotated by 90 degrees, the base end of the wide jib 7 protrudes from the bottom surface of the boom 7, but by pulling it up using the lifting mechanism, the rotating bracket 22 can be moved to the base member 18. The jib 7 is raised along the guide grooves 20, 20.
The base end of the jib 7 is housed within the height of the side surface of the boom 3, and the lower end of the jib 7 does not protrude.

Therefore, when the jib 7 is moved from the lower surface to the side surface of the boom 3, it can be realized with a simple structure.

Note that the present invention is not limited to the above embodiment. For example, if the connection between the first connection bracket and the rotating bracket is also made by utilizing the contraction of the boom, the jib can be stored more easily. Further, as the pulling mechanism, a winch of the crane itself may be used without providing a separate winch, or a mechanism including a hydraulic cylinder or the like may be used.

The present invention is not limited to a type of crane in which both traveling and crane work are carried out in one operator's cab, but can also be implemented in a normal truck crane.

[Effects of the Invention] As explained above, according to the present invention, when storing the jib, the jib is first supported on the bottom side of the boom and then pulled up and stored on one side of the boom. When the jib is placed along the bottom of the boom, it is deflected to one side, so
This jib and boom can be immediately connected at the pivot point used for the next rotation, and when this jib is rotated by the pulling mechanism, it can be rotated within a small rotation radius and along one side of the boom. can be set. Moreover, since the proximal end of the jib is guided by the base member and pulled up, it falls within the side height of the boom. For this reason, it is possible to realize a configuration in which the jib is moved from the bottom surface of the boom to the side surface, while having a simple structure.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, in which FIG. 1 is a side view of the entire vehicle-type crane, and FIG.
The figure is a bottom view with a partial cross section of the base end of the jib, Figure 3 is a bottom view of the boom showing the proximity of the jib, Figure 4 is a sectional view taken along the line - in Figure 1, and Figure 5 is the 4
6 is a perspective view of the middle part of FIG. 5, FIG. 7 is a sectional view taken along the line in FIG. 1,
FIG. 8 is a partially cross-sectional view taken from the direction of the arrow in FIG. 7. FIG. 3...Boom, 7...Jib, 10a, 10b...Axle,
13...Tilt mechanism, 18...Base member, 20...Guide groove, 21...Elevating shaft (elevator), 22...Rotating bracket, 23...Winch (lifting mechanism), 26...First connection bracket, 29...Fixing bracket, 31
...Second connection bracket.

Claims (1)

[Claims] 1. In a vehicle-type crane in which axles are provided on both sides of the distal end of a telescoping boom and each side of the base end of the jib is rotatably pivoted around the shaft to form an overhang of the jib, the base end of the jib is and when the tip end side of the jib is rotated around the axis toward the rear of the bottom surface of the boom,
A tilting mechanism that aligns the jib along the bottom surface of the boom and deflects the jib so that the tip side of the jib protrudes from one side of the boom; a base member having a guide groove facing toward the base member, an elevator provided to be movable up and down along the guide groove of the base member, a rotatable rotating bracket whose one end side is pivotally supported by the elevator, and the above-mentioned a first connecting bracket provided at the proximal end of the jib and removably connected to the rotating bracket when the jib approaches the lower surface of the boom and is deviated; and a first connecting bracket provided at the proximal end of the boom; A fixed bracket provided on one side, and a fixed bracket provided on the tip side of the jib that removably engages with the fixed bracket when the jib approaches the bottom surface of the boom and protrudes from one side of the boom. a second connecting bracket that engages the distal end of the jib so that it can rotate in the same direction as the rotating bracket about the fixed bracket; A jib storage device for a vehicle-type crane, characterized in that it is equipped with a pulling mechanism that rotates the jib and pulls it upward.