JPS6261518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crane comprising an outer cylinder, a middle cylinder, and an inner cylinder in a working vehicle such as a pole-erecting vehicle equipped with an earth auger.

BACKGROUND ART Conventionally, some cranes for working vehicles have a middle cylinder inserted into an outer cylinder and an inner cylinder slidably inserted into a 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 manually to the tip of the middle cylinder, or it is moved in and out using a multi-stage cylinder, but with the former, the work is extremely complicated and requires careful handling. In addition, in the latter case, the cylinder output increases and the number of extension/contraction stages of the crane cannot be changed, so when applied to a pole-erecting vehicle, the middle cylinder and inner cylinder always protrude and retract from the outer cylinder and middle cylinder. However, since the earth auger is connected to the inner cylinder, the unnecessary inner cylinder also protrudes during pole erection work, making it impossible for the crane to turn freely in narrow spaces. There was a problem (see Utility Model Publication No. 48-14286 as a precedent example).

In addition, there is a structure in which an earth auger can be connected to either the base boom or the tip boom that forms the two-stage boom (for example, see Japanese Utility Model Publication No. 48-24962), but this structure requires two-stage crane work. This is possible only within the range of extension and retraction of the boom, and there remain unresolved problems in making it possible to selectively switch the number of extension and retraction stages of a multi-stage boom in response to crane work and auger work.

The present invention has been made in view of this point, and the boom telescoping device causes the middle cylinder and the inner cylinder to protrude and retract from the outer cylinder and the inner cylinder, respectively, or to make the middle cylinder protrude and retract from the outer cylinder with the inner cylinder inserted. To provide a crane for a work vehicle equipped with an earth auger that allows easy selection of the number of boom extension/retraction stages corresponding to such work.

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 pole-erecting vehicle, and a base 2a is rotatably provided at the rear of a chassis 2, and a crane 3 is connected to the base 2a. , an operator seat 4 for the crane 3 is provided, and an earth auger 5 is provided on the side of the crane 3. The crane 3 includes an outer cylinder 6 and an outer cylinder 6.
It consists of a middle cylinder 7 which is slidably inserted into the inner cylinder 7, and an inner cylinder 8 which is slidably inserted into the middle cylinder 7, and the outer cylinder 6 has its base rotatably attached to the base 2a. An undulation cylinder 9 is connected between the central portion and the base 2a. Furthermore, a boom extension and retraction device 10 is provided inside the crane 3,
The boom telescoping device 10 includes one single-stage cylinder 1
1 and two first and second cables 12 and 13. The tip of the piston rod 14 of the cylinder 11 is fixed to the base of the outer tube 6, and the tip of the barrel 15 is fixed to the base of the middle tube 7. Two first guide wheels 17 are rotatably held at the base of the barrel 15 of the cylinder 11 via a support member 16, and two second guide wheels 18 are rotatably held at the base of the middle cylinder 7. ing. One end of the first cable 12 is fixed 20 to the operating means 19, and one first guide wheel 17 is suspended inside the inner cylinder 8, so that the first cable 12 is attached to the groove of the fixing member 21 fixed to the base of the inner cylinder 8. 21a, and further the other first guide car 17,
The other end is fastened 20 to the operating means 19, and the hanging portion of the groove 21a is fixed to the fixed member 20 without moving.
It is fastened 22 to 1. One end of the second cable 13 is fixed 23 to the fixing member 21, and one second guide wheel 18 is suspended between the outer cylinder 6 and the middle cylinder 7, and the groove 24a of the stopper 24 is suspended. , the other second guide wheel 18 is suspended, and the other end is fixed 23 to the fixing member 21, and the groove 24a
The suspension part is fixed 25 to the stopper 24 without moving. The operating means 19 can be selectively engaged with and fixed to either the base of the outer cylinder 6 or the base of the inner cylinder 7, and a support shaft 26 is provided at the end of the first cable 12. Lever 27 on support shaft 26
is rotatably provided. The lever 27 is formed with a concave front locking part 28 and a rear locking part 29, and is connected with an operating part 30. The operating section 30 protrudes outward and is provided so as to face the operating seat 4. Protrusions 31 and 32 are provided at the base of the outer cylinder 6 and the base of the middle cylinder 7, respectively, to engage with the rear locking part 29 and the front locking part 28. The stopper 24 is automatically engaged with and fixed to either a holding means 33 provided outside the tip of the inner tube 7 or a contact member 34 provided at the tip of the outer tube 6. Convex portion 24
b is formed. The holding means 33 is the middle cylinder 7
A protruding rod 36 is fixed at right angles to the outer surface of the holder, and a retaining rod 37 is rotatably pivotally attached to the tip of the protruding rod 36.
The holding rod 37 has a hook portion 37a formed at its tip, and the hook portion 37a engages with the convex portion 24b of the stopper 24 to hold the stopper 24. Further, a biasing means 38 such as a spring is interposed between the holding rod 37 and the middle cylinder 7, and the biasing means 38 is attached to the hook portion 3.
The hook portion 37a is pressed against the protrusion 24b so as to maintain the engagement state between the hook 7a and the protrusion 24b.
The abutment member 34 is provided so that its front surface abuts the rear surface of the stopper 24, and
A through hole 35 is bored through the hole. 39 is a hook suspended from the crane 3 via a wire 40. The earth auger 5 has a main body 6a.
and a distal end 6b, and the distal end 6b is connected to the distal end 6b of the outer cylinder 6, which is configured by being divided into a distal end 6b and a distal end 6b. Connecting means 41 is provided to do so.
The earth auger 5 has a blade 4 on the drive shaft 42.
An auger motor 45 is connected to the end of the auger drill 44 provided with the auger drill 3, and a base frame 46 is connected to the auger motor 45, and the connecting rod 4 is connected to the base frame 46.
One end of the connecting rod 47 is pivotally supported, and the other end of the connecting rod 47 is pivotally supported by the tip 6b of the outer cylinder 6, and is housed in parallel with the crane 3. In the connecting means 41, a hook 48 is rotatably supported on the side of the outer cylinder tip 6b.
50, engagement pins 51 and 52 are bored at the tip sides of the outer cylinder body 6a and the middle cylinder 7, and the engagement pin 51 of the outer cylinder body 6a and the rear hook part 50, or the middle cylinder 7 The engagement pin 52 and the front hook portion 49 are engaged to connect the outer cylinder tip 6b to the outer cylinder main body 6a or the middle cylinder 7. A spring 53 is provided between the hook 48 and the tip 6b, and the spring 53 pushes the front part of the hook 48 upward so that the front hook part 49 engages with the engagement pin 52 of the middle cylinder 7. It's encouraging. Furthermore, a stopper 54 is formed at the rear of the hook 48, and when the earth auger 5 is stored, the connecting rod 47 comes into contact with the stopper 54, and the rear hook 50 automatically engages with the engagement pin 51 of the outer cylinder body 6a. The hook 48 is rotated so as to move. Reference numeral 55 represents a support member that stores and holds the earth auger 5, and 56 represents a wire that automatically stores the earth auger 5 as the auger drill 44 rotates. still,
Although not shown, the operating lever of the earth auger 5 is connected to the operating section 30.

Next, to explain the operation, FIG. 2 shows a state in which the middle cylinder 7 and the inner cylinder 8 are recessed into the outer cylinder 6 and the middle cylinder 7, respectively, and the outer cylinder tip 6b is connected to the main body 6a and the earth auger 5 is stored, the operation part 30 protrudes from the base of the outer cylinder 6 and faces the operation seat 4, and the stopper 24 has a convex part 24b that is connected to the holding means 33.
The rear surface is engaged with the hook portion 37a of the contact member 34.
is in contact with. From this state, the middle cylinder 7 and the inner cylinder 8
When performing crane work by making the cylinders protrude and retract from the outer cylinder 6 and the middle cylinder 7, respectively, when the rear locking part 29 of the lever 27 is engaged with the protrusion 31 of the outer cylinder 6 and the cylinder 11 is extended, the seventh As shown in the figure, at the same time that the middle tube 7 moves to protrude from the outer tube 6, the first cable 12 is pulled toward the proximal end of the outer tube 6, and the inner tube 8 moves to protrude from the middle tube 7. As the inner cylinder 8 moves, the second cable 13 is pulled toward the distal end side of the middle cylinder 7,
The stopper 24 resists the biasing means 38 and holds the holding means 3.
3 and maintains contact with the contact member 34. Furthermore, when the cylinder 11 is contracted, the second cable 13 is pulled toward the distal end of the outer cylinder 6 as the middle cylinder 7 is retracted into the outer cylinder 6, and the inner cylinder 8 is retracted into the middle cylinder 7. When the inner cylinder 7 is completely recessed into the outer cylinder 6, the stopper 24 engages with the holding means 33 again.

Next, when the middle cylinder 7 is made to protrude and retract from the outer cylinder 6 with the inner cylinder 8 recessed into the middle cylinder 7, in other words, the outer cylinder tip 6b is connected to the middle cylinder 7, and the earth auger 5 is inserted into the middle cylinder 7. When performing pillar erection work by suspending the cylinder 11 from the cylinder 11, the locking part 28 of the lever 27 is engaged with the protrusion 32 of the middle cylinder 7, and the cylinder 11 is extended, as shown in FIG. As the cylinder 7 moves to protrude from the outer cylinder 6, the operating means 19 also moves together with the middle cylinder 7, and the first cable 12 is held at the above-mentioned position without being pulled, and the second cable 13 is also moved. Since it is not pulled, the stopper 24 moves together with the middle cylinder 7 while being engaged and held by the holding means 33. In this state, when the crane 4 is rotated downward from the tip, the inner cylinder 8
tries to protrude from the middle tube 7 and pulls the second cable 13, but the second cable 13 does not move because the stopper 24 is engaged with the holding means 33, and the inner tube 8 does not move. The self-propulsion of the inner cylinder 8 is prevented by maintaining the state recessed into the cylinder 7. Also, cylinder 11
When the inner cylinder 7 is contracted, the inner cylinder 7 and the inner cylinder 8 are retracted into the outer cylinder 6.

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 in the longitudinal direction is bored in a part of the inner cylinder 8 to secure the piston rod 14, and a first guide wheel 17 is provided at the tip of the piston rod 14. Furthermore, in this example,
Although the cylinder 11 is arranged between the outer cylinder 6 and the inner cylinder 7, the cylinder 11 may also be arranged between the outer cylinder 6 and the inner cylinder 8 or between the middle cylinder 7 and the inner cylinder 8. Although the first guide wheel 17 is often pivoted to the base of the barrel 15 of the cylinder 11 via the support member 16, it may also be pivoted directly to the tip of the middle cylinder 7. In addition, the first and second cables 1
2 and 13 are each provided with one cable folded back at the center, but one end of each of the two cables or one strong cable is attached to the base of the inner cylinder 8, and the other end is operated. It may be fixed to the means 19 and the stopper 24, respectively. Furthermore, although the holding means 33 is configured to have a hook portion 37a to engage with the convex portion 24b of the stopper 24, a magnet may be provided to hold the stopper 24. Furthermore, although the holding means 33 is provided with the urging means 38, the stopper 24 may be provided with urging means to press the convex portion 24b against the hook portion 37a. The rod 37 is fixed to the protruding rod 36. In addition, the outer cylinder 6
Not only the earth auger 5 but also other working tools can be attached to the tip of the earth auger 5.

As described above, according to the crane for the work vehicle equipped with the earth auger of the present invention, the boom telescoping device allows the middle cylinder and the inner cylinder to protrude and retract from the outer cylinder and the middle cylinder with the earth auger, respectively. Since the inner cylinder can be selected to be retracted from the outer cylinder while being retracted, work with the earth auger and crane can be performed safely and easily.
Furthermore, if the operating means is replaced in conjunction with the operating lever of the earth auger, crane work and pole erection work in narrow spaces can be performed extremely safely and easily.

Further, as shown in the embodiment of the present invention, if the selection operation of the number of boom stages is performed at the boom base near the operator seat for crane work and hole digging work,
The operator can control various tasks from the operator's seat, making the work easier.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a side view of a pole-erecting vehicle, FIG. 2 is a cross-sectional side view of a crane,
Fig. 3 is a cross-sectional plan view of the same, Fig. 4 is an enlarged side view showing the stopper and holding means, Fig. 5 is a side view of the connecting means, Fig. 6 is a front view of the same, and Fig. 7 is a middle cylinder. and FIG. 8 is a schematic side view of the crane showing the case where both the inner cylinder and the inner cylinder are projected, and FIG. 8 is a schematic side view of the crane showing the case where only the middle cylinder is projected. 1...Pole erection vehicle, 3...Crane, 4...Operation seat, 5...Earth auger, 6...Outer cylinder, 7...Middle cylinder, 8...Inner cylinder, 10...Boom extension and contraction device, 11
...Cylinder, 12...First cable, 13...Second
Cable, 17...First guide car, 18...Second guide car, 19...Operation means, 24...Stopper, 24
b... Convex portion, 26... Support shaft, 27... Lever, 2
8...Front locking part, 29...Rear locking part, 30...
...Operation unit, 31, 32...Protrusion, 33...Holding means, 37a...Hook part, 38...Biasing means, 6a
...Main body, 6b...Tip portion, 41...Connection means.

Claims (1)

[Claims] 1. An outer cylinder divided into a main body and a distal end, a middle cylinder slidably inserted into the outer cylinder, and a middle cylinder slidably inserted into the middle cylinder. a connecting means provided at the tip of the outer tube for selectively securing the tip to the main body or the middle tube; and a boom for moving the middle tube and the inner tube into and out of the outer tube. The boom telescoping device is comprised of a telescoping device and a working tool such as an earth auger provided at the tip of the outer cylinder, and the boom telescoping device is a cylinder that is interposed between the outer cylinder and the middle cylinder to relatively move them into and out; A guide wheel is provided at the distal end of the cylinder and the base end of the middle cylinder, and the guide wheel is suspended by the guide wheel, and each end is fixed to the base end of the inner cylinder, and each other end is connected to an operating means and a stopper. The operating means is selectively engaged with the outer cylinder base or the middle cylinder base, and the stopper is connected to the outer cylinder tip or through the holding means. A crane for a work vehicle, characterized in that the boom is selectively engaged with the tip of the middle cylinder, and the number of extension/contraction stages of the boom can be changed in response to crane work or auger work by selective operation using the connecting means and the operating means. . 2 The operating means includes a support shaft provided at the end of one of the cables, a lever that is pivotally supported by the support shaft and has a locking part that can be attached and detached to a protrusion provided on the outer cylinder and the middle cylinder. A crane for a work vehicle according to claim 1, comprising an operating section connected to a lever. 3. A crane in a working vehicle according to claim 1, wherein a crane operator seat is provided in the vicinity of the operating section.