JPS6119557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boom telescoping device that allows a crane consisting of an outer cylinder and an inner cylinder to be extended and retracted using one cylinder and two cables.

Conventionally, in a crane for a mobile crane, a middle cylinder is slidably inserted into an outer cylinder, and an inner cylinder is slidably inserted into the middle cylinder, so that the middle cylinder and the inner cylinder can be moved in and out. In these cranes, the inner cylinder is either fixed to the tip of the middle cylinder by input, or it is moved in and out using a multi-stage cylinder, but in the former case, the work is extremely complicated, and the inner cylinder is attached to the middle cylinder. Since the crane is in either the most protruded state or the most retracted state, the range of telescopic movement of the crane is limited to the range in which the middle cylinder moves in and out of the outer cylinder, which is extremely narrow. In addition, the latter type had problems such as a complicated structure and a large weight, resulting in a decrease in crane capacity.

The present invention has been made in view of these points, and includes:
This single-stage cylinder is equipped with two cables, one cable is attached to the base of the outer cylinder or the middle cylinder, and the other cable is selectively attached to the tip of the outer cylinder or the middle cylinder by an engaging means. By fixing the engagement and making the engagement means always engage with either one of the cables, the inner tube can be moved in and out of the outer tube and the inner tube, respectively, while the inner tube can be inserted. To provide a boom extension/retraction device for a crane vehicle, in which an inner cylinder is made to protrude and retract from an outer cylinder in a state in which the inner cylinder is moved in and out of the outer cylinder.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, reference numeral 1 is a crane truck, and a base 3 is rotatably provided at the rear of a chassis 2. A crane 4 is connected to the base 3. Four operation seats 5 are provided.

The crane 4 consists of an outer cylinder 6 and an inner cylinder 8 which is slidably inserted into an inner cylinder 7 which is slidably inserted into the outer cylinder 6, and a boom telescoping device 9 is provided inside. . The base of the outer cylinder 6 is rotatably supported by the base 3, and an undulating cylinder 10 is connected between the center and the base 3.

The boom telescoping device 9 has one single stage cylinder 11
The piston rod 14 of the cylinder 11 is fixed to the proximal end of the outer cylinder 6, and the barrel 15 is fixed to the proximal end of the inner cylinder 7. There is. Two first guide wheels 17 are rotatably attached to the base end of the barrel of the cylinder 11 via a support member 16, and two second guide wheels 18 are rotatably attached to the base end of the middle cylinder 7. It is rotatably pivoted. The first cable 12 has one end connected to the operating means 19
One first guide wheel 17 is suspended inside the inner cylinder 8, the groove 21a of the fixing member 21 fixed to the base of the inner cylinder 8 is suspended, and the other first guide wheel is 17 is suspended, and the other end is fastened 20 to the operating means 19, and the suspended portion of the main part 21a is fastened 22 to a fixed member 21 without moving. One end of the second cable 13 is fixed to the fixed member 21 2
3, one of the second guide wheels 18 is suspended between the outer cylinder 6 and the inner cylinder 7, and the retaining means 24 has a rear part 2.
4a is suspended, and further the other second guide wheel 18 is suspended, and the other end is fixed 23 to the fixing member 21, and the suspension part of the rear part 24a is fixed to the holding means 2 without moving.
It is fastened 25 to 4.

The operating means 19 can be selectively engaged and fixed to either the base of the outer cylinder 6 or the base of the inner cylinder 7, and the engaging rod 27 is connected to the clip 26 to which the first cable 12 is fixed 20. are screwed together so that the tension of the cable can be freely adjusted, and an annular portion 29 is formed at the tip of the engagement rod 27 into which an engagement pin (engagement means) 28 can be inserted. On the other hand, at the base of the outer cylinder 6, an engagement piece 31 is fixed to the upper and lower edges of an opening 30 through which the engagement rod 27 can be freely inserted.
An engagement hole 32 is formed through which the mating piece 31 can be freely inserted.
With the annular portion 29 inserted therebetween, the engagement pin 28 is inserted and the first cable 12 is engaged and fixed to the outer cylinder 6.
Furthermore, the engagement piece 31 is provided so as to face the operator seat 5. Further, a stopper 33 through which the first cable 12 passes is fixed to the base of the middle cylinder 7.
The engaging rod 27 comes into contact with the first cable 12 and the middle tube 7
is engaged and fixed.

The holding means 24 is attached to the tip of the outer cylinder 6 or the middle cylinder 7.
An opening 35 through which the engagement pin 28 can be freely inserted is formed in the tip of the protruding plate 34 forward of the base portion 24a, and the protruding A support plate 36 is fixed to the outer surface of the central portion of the plate 34. On the other hand, a stopper 37 is fixed to the tip of the outer cylinder 6 so as to protrude slightly forward, and the rear end surface of the support plate 36 that matches the tip of the stopper 37 comes into contact with the stopper 37, so that the second cable 13 The outer cylinder 6 is engaged and fixed. Further, an engagement plate 39 is fixed to the tip of the middle cylinder 7 with a gap 38 through which the protruding plate 34 can be inserted, and an engagement hole 40 through which the engagement pin 28 can be inserted is bored in the engagement plate 39. With the protrusion plate 34 inserted into the gap 38, the engagement pin 28 is inserted and the second cable 13 is engaged and fixed to the middle tube 7.

Reference numeral 41 denotes a lifting tool suspended from the crane 4 via a wire 42.

Note that only one engagement pin 28 is provided, and either the operating means 19 is engaged and fixed to the outer cylinder 6, or the holding means 24 is engaged and fixed to the inner cylinder 7. .

Next, the operation will be explained. As shown in FIG. The protruding plate 34 of the holding means 24 is inserted into the gap 38 so as to face the operator seat 5. In this state, when the middle cylinder 7 and the inner cylinder 8 are moved out and out of the outer cylinder 6 and the middle cylinder 7, respectively, the engagement pin 28 is inserted into the engagement hole 32 of the upper engagement piece 31.
The engagement hole 3 of the lower engagement piece 31 passes through the annular portion 29.
2 to fix the operating means 19 to the outer cylinder 6, while the holding means 24 is disengaged from the inner cylinder 7, and the support plate 36 and the stopper 37 come into contact with each other to engage the outer cylinder 6. Fixed. Next, cylinder 11
When extended, as shown in FIG. 5, the middle tube 7 moves to protrude from the outer tube 6, and at the same time, the first cable 12 is pulled toward the proximal end of the outer tube 6, causing the middle tube 8 to protrude from the inner tube 7. Moving. With this movement of the inner cylinder 8, the second cable 13 is pulled toward the distal end side of the inner cylinder 7, and the holding means 24
When the support plate 36 and the stopper 37 come into contact with each other, the outer cylinder 6
remain engaged. Also, cylinder 11
When contracted, the second cable 13 is pulled toward the tip of the outer cylinder 6 as the middle cylinder 7 is retracted into the outer cylinder 6, the inner cylinder 8 is retracted into the middle cylinder 7, and the middle cylinder 7 is moved. When completely immersed in the outer cylinder 6, the protruding plate 34 is reinserted into the gap 38.

Next, when the middle cylinder 7 is to be made to protrude and retract from the outer cylinder 6 with the inner cylinder 8 recessed into the middle cylinder 7, the operating means 19
While removing the engagement pin 28 that fixes it to the outer cylinder 6 and releasing the engagement with the outer cylinder 6, the removed engagement pin 28 is opened from the engagement hole 40 of the engagement plate 39. The holding means 2 is inserted into the middle cylinder 7 through the part 35.
4 is fixed to the middle cylinder 7. Subsequently, when the cylinder 11 is extended, the middle cylinder 7 moves to protrude from the outer cylinder 6, as shown in FIG. Both the first cable 12 and the second cable 13 are not pulled, and the inner cylinder 8 moves to protrude from the outer cylinder 6 together with the middle cylinder 7 while being immersed and fixed in the middle cylinder 7. In this state, when the crane 4 is rotated downward from the tip or is pulled forward by a winch or the like, the inner cylinder 8 tries to protrude from the middle cylinder 7, but the engagement pin 28 protrudes into the middle cylinder 7. Board 34
Since the inner cylinder 8 is also fixed to the middle cylinder 7, the inner cylinder 8 maintains a recessed state in the middle cylinder 7, and the inner cylinder 8 is prevented from moving on its own. Furthermore, when the cylinder 11 is contracted, the inner cylinder 7 and the outer cylinder 6 are moved together with the inner cylinder 8.
When completely retracted, the annular portion 29 is inserted between the locking pieces 31 again.

In this embodiment, the piston rod 14 of the cylinder 11 was fixed to the outer cylinder 6, and the barrel 15 was fixed to the inner cylinder 7, but conversely, the barrel 15 was fixed to the outer cylinder 6.
Alternatively, the piston rod 14 may be fixed to the middle cylinder 7, respectively, and in this case, the piston rod 14 and the middle cylinder 7
A long hole is formed in a part of the inner cylinder 8 in the longitudinal direction to fix the piston rod 14, and a first guide wheel 17 is provided at the tip of the piston rod 14. Furthermore, in this embodiment, the first guide wheel 17 is pivotally connected to the base end of the barrel 15 of the cylinder 11 via the support member 16, but it is directly attached to the middle cylinder 7.
It may be provided at the tip of the In addition, the first and second cables 12 and 13 were each provided by folding one cable at the center, but each had two cables or one end of a stronger cable in the inner tube. At the base of 8,
The other end may be fixed to the operating means 19 and the holding means 24, respectively.

As described above, according to the telescopic boom installation for a crane vehicle of the present invention, one single-stage cylinder and two cables are provided, one cable is used as an operating means, and the other cable is used as a holding means. the operating means is selectively engaged with the base of the outer cylinder or the middle cylinder, and the holding means is selectively engaged with the tip of the outer cylinder or the middle cylinder, and the engaging means is either the operating means or the holding means. Since the inner cylinder is engaged with the inner cylinder, the inner cylinder can be moved in and out of the outer cylinder and the inner cylinder at the same time, and the inner cylinder can be moved in and out of the outer cylinder while the inner cylinder is retracted, expanding the work range. In addition, since the engaging means engages and fixes only either the operating means or the holding means, erroneous operation can be reliably prevented, and the engaging means can be operated at the base end of the cylinder or This is done at the tip, making it easy to align the engagement and making the work safe and easy. Furthermore, since the crane can be operated with a small cylinder power, the overall weight of the crane is reduced.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a side view of a crane vehicle, FIG. 2 is a cross-sectional side view of the crane, and FIG. 3 is a rear view of the same part showing when the operating means and the outer cylinder are engaged. 4 is a plan view of the main part showing when the holding means and the middle cylinder are engaged, and FIG. 5 is a schematic side view of the crane showing the case where both the middle cylinder and the inner cylinder are protruded.
FIG. 6 is a schematic side view of the same, showing a case where only the middle cylinder is protruded. 1... Crane truck, 2... Chassis, 4... Crane, 6... Outer cylinder, 7... Middle cylinder, 8... Inner cylinder, 9...
...Boom telescoping device, 11...Single stage cylinder, 1
2... first cable, 13... second cable, 17... first guide car, 18... second guide car, 19... operating means, 20, 22, 23, 25... anchoring, 24...
Holding means, 28... engagement pin, 31... engagement piece,
33, 37... Stopper, 39... Engagement plate.

Claims (1)

[Scope of Claims] 1. The outer cylinder of the crane, in which a middle cylinder is slidably inserted into the outer cylinder, and an inner cylinder is slidably inserted into the middle cylinder.
A cylinder is disposed between the middle cylinders, a guide wheel is pivotally attached to the distal end and the base end of the middle cylinder, and two cables are respectively attached to the base end of the inner cylinder. One end of the cable is attached to the guide wheel on the distal end side of the middle cylinder, and the other end is connected to the operating means, and the other cable is attached to the guide wheel on the proximal end of the middle cylinder. The ends thereof are respectively fixed to holding means, the operating means is provided so as to be engageable with the outer base of the outer cylinder via an engaging means or the base of the middle cylinder, and the holding means is provided with the outer base of the outer cylinder so as to be engageable with the base of the middle cylinder. It is provided at the distal end so as to be engageable with the inner cylinder through an engaging means or with the distal end of the outer cylinder, and the engaging means selectively engages either the operating means or the holding means. A boom extension and retraction device for a crane truck, characterized by: 2. The engaging means is a single engaging pin, and the operating means is removably fixed to a holder installed at the base of the outer cylinder, while the holding means is removably connected to the tip of the inner cylinder. A crane boom extension/retraction device according to claim 1, which is fixed.