JPH0848490A - Jib accommodation device for wheel type crane - Google Patents

Abstract

PURPOSE:To prevent the trouble by which the crane work is obstructed by a jib in an accommodation state. CONSTITUTION:A jib A is constituted of a basic end side member 18 having a jib foot 20 and a top end side member having a jib head so as to be assembled and diassembled, and on the undersurface side of the front bumper 36 of a lower part travelling body L, a jib accommodation part 37 is installed, and when not used, the jib A is disassembled, and accommodated into the jib accommodation part 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib storage device for storing a jib when not in use in a wheel type crane such as a truck crane or a rough terrain crane.

[0002]

2. Description of the Related Art Conventionally, as a method of storing a jib, Japanese Patent Publication 6
As shown in Japanese Patent Laid-Open No. 3-3827, there are known a horizontal holding method for storing a jib on the side surface of the boom, a lower holding method for storing the jib on the lower surface of the boom, and an upper holding method for storing the jib on the upper surface of the boom.

[0003]

However, the conventional method of storing the jib in the boom has the following drawbacks.

Since the jib protrudes laterally or vertically of the boom, the jib becomes an obstacle especially during crane work in a narrow space.

The jib increases the weight of the boom and reduces the lifting capacity.

[0006] Particularly, according to the upper hugging and lower hugging systems, the jib obstructs the field of view during traveling of the crane.

In the case of the upper hug method, the center of gravity of the boom becomes high due to the jib, and traveling stability deteriorates.

Therefore, the present invention provides a jib storage device for a wheel type crane, which does not cause any of the above-mentioned problems associated with jib storage.

[0009]

According to a first aspect of the present invention, a jib has a tip side member having a jib point sheave at its tip portion, and a base end side member having a jib foot detachably attached to the boom head. And is divided into a plurality of jib constituent members in the lengthwise direction, and each jib constituent member is configured to be convertible between an extended state when extended and a contracted state when retracted. Is provided with a jib storage unit for storing in the reduced state.

According to a second aspect of the present invention, in the structure of the first aspect, the jib storage portion is provided on the lower surface of the lower traveling body.

According to a third aspect of the present invention, in the structure of the first or second aspect, the length of the longest portion of the jib in the contracted state is set to be equal to or less than the width dimension of the lower traveling body, and the jib storage portion is the lower traveling body. Is provided in the traveling body width direction and within the traveling body width at the front end portion of.

According to a fourth aspect of the present invention, in the construction according to any one of the first to third aspects, the member on the tip side of the jib has a body portion,
The jib head is detachably attached to the main body, and the rope guide sheave is provided on the jib head.

[0013]

According to the above construction, the jib can be stored in the lower traveling body in a contracted state when not in use.

For this reason, it is possible to eliminate all the harmful effects caused by storing the jib in the boom as in the prior art during crane work and traveling.

Further, according to the second aspect of the present invention, since the jib is stored on the lower surface of the lower traveling body, the jib interferes with the work when riding on the traveling body and carrying out the work as in the case of storing the jib on the upper surface. There is no danger that the worker will get stuck in the jib.

Further, according to the third aspect of the present invention, since the jib is stored at the front end of the traveling body, which is close to the boom head, the jib is particularly easy to carry and the jib projecting / storing work is efficient. Become.

In addition, when the jib storage portion is provided on the lower surface side of the front end portion of the traveling body, since the lower portion of the front end portion is originally a dead space, the jib storage portion can be easily and easily installed.

On the other hand, according to the structure of claim 4, the length of the tip side member can be shortened by removing the jib head when the jib is stored, and the length of the main body portion of the member can be lengthened accordingly and the jib extends. The total length of the jib in the state can be lengthened.

[0019]

Embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 3 show the jib removed state, and FIGS. 2 and 4 show the jib mounted (extended) state.

In each of these drawings, 1 is a boom, 2 is a boom head (boom tip), and inside the boom head 2, an idler, both main sheaves 3 and 4, a lower surface (when the boom 1 is horizontally tilted) The main hook storage metal fittings 5 are provided on the lower surface of each of the main hook storage metal fittings 5 on the outer side. Stored on the bottom side.

Reference numeral 8 denotes a main hook storage metal fitting shaft around which the main hook storage metal fitting 5 rotates.

An auxiliary sheave bracket 10 having an auxiliary sheave 9 for a supplementary rope guide is attached to the front side of the boom head 2, and when the jib is attached, the auxiliary sheave bracket 10 is attached as shown in FIGS. 10 is attached to the jib tip and is used as a jib head.

The auxiliary sheave bracket 10 is shown in FIGS.
As shown in Fig. 1, a downward arcuate contact surface 1 is formed on the lower side of the base end.
1, a square tube-shaped mounting portion 13 having a pin hole 12 on the upper side
Are provided respectively.

The auxiliary sheave bracket 10 is mounted by the pin 14 with the mounting portion 13 inserted into the boom head 2 with the contact surface 11 engaged with the main hook storage metal shaft 8 except when the jib is mounted. To be

A supplementary hook storage fitting 15 is attached to the tip of the auxiliary sheave bracket 10 so as to be rotatable around a horizontal axis, and the supplementary hook 16 is attached to the supplementary hook 1 during traveling of the crane.
By the hoisting force of 7, the auxiliary hook storage metal fitting 15 and the auxiliary hook storage metal fitting 15 are stored under the boom head (state of phantom line in FIG. 3).

The jib A is a square pipe-shaped base end member 18
And is also divided into a square pipe-shaped tip side member 19,
Both members 18 and 19 are configured to be convertible between an assembled state (extended state) and a disassembled state (reduced state).

As shown in FIGS. 5 and 6, the base end side member 18 has left and right bifurcated leg portions 18a, 18a on the base end side, and the main hooks are attached to the tips of the both leg portions 18a, 18a when the jib is attached. A downward bifurcated jib foot 2 that engages with the housing metal shaft 8
0 and 20 are provided.

Further, as shown in FIG. 6, both leg portions 18a,
Plate-shaped pin guides 21 and 21 are provided between 18a and between both jib feet 20 and 20, and a jib fixing pin 22 is inserted across both pin guides 21 and 21.

The jib fixing pin 22 is moved forward and backward between a jib fixing position projecting to the jib foot side as shown by the solid line in FIG. 6 and a fixing releasing position retracting to the leg portions 18a, 18a side as shown by the phantom line. It is provided slidably in the (jib length direction), and the jib fixing pin 22 is set to the jib fixing position in a state where the jib feet 20 and 20 are engaged with the main hook storage metal shaft 8, so that the jib feet 20 and 20 are Is retained against the main hook storage metal shaft 8.

Reference numeral 23 is a lock plate which is also provided on the jib fixing pin 22 and also serves as a handle for sliding operation. Reference numeral 24 is a lock plate which is provided on the lower surface of the leg portions 18a, 18a and straddles the lock plates 23, 24. Pin 25
Is inserted, the jib fixing pin 22 is locked at the jib fixing position.

A left and right bifurcated connecting portion 18b is provided on the tip end side of the base end side member 18, and the base end portion of the tip end side member 19 is fitted into the connecting portion 18b to connect two front and rear connecting pins (hereinafter , Front connecting pin and rear connecting pin).

Further, a rotation stopping plate 28 is provided on the upper surface of the tip end portion of the base end side member 18 so as to face the connecting portion 18b, and the tip end side member 1 with respect to the base end side member 18 is attached in the jib mounting process described later.
Rotation in one direction of 9 is stopped by this rotation stop plate 28.

On the other hand, the tip side member 19 is the base end side member 18
The auxiliary sheave bracket 10 as a jib head is detachably attached to the tip of the main body portion 29 connected to.

That is, the pin hole 3 is provided at the tip of the main body 29.
0 is provided so as to penetrate left and right, and when the jib is extended, the mounting portion 13 of the auxiliary sheave bracket 10 is fitted into the distal end portion of the main body portion 29, and the pin holes 12 and 30 of each other are inserted.
The auxiliary sheave bracket 10 is attached to the tip of the main body 29 by inserting the pin 31 into the tip side member 19.

As shown in FIGS. 2 and 4, the jib A has the jib feet 20 and 20 inserted into the boom head 2 to engage with the main hook storage metal shaft 8 and is prevented from coming off by the jib fixing pin 22. Attached to the boom head 2 in this state,
It is supported by a tension rope 32 suspended between the boom head 2 and the tip of the jib.

Further, a stopper 33 is attached between the base end of the jib and the boom head 2, and this stopper 33 prevents the jib A from being inverted (raised) during jib work. Reference numeral 34 is a stopper mounting bracket to which the jib side end of the stopper 33 is mounted.

When the jib is stored, the stopper 33 is reversed to the front as shown in FIG. 8, and the front end portion in this reversed state is pin-fixed to the storage bracket 35.

On the other hand, FIGS. 7 and 8 show the construction of a jib storing section for storing the jib A when not in use.

In the figure, L is a lower traveling body, C is a carrier frame of the lower traveling body L, and 36 is a front bumper provided at the front end of the carrier frame C.
A jib storage portion 37 is provided below the front bumper 36.

The jib storing portion 37 has two jib receiving frames 38, 3 each having a U-shaped cross section, which is shorter than the width dimension of the lower traveling body L.
9 is the front bumper 36 in a horizontal state adjacent to the front and rear.
It is configured to be attached to the lower surface of the vehicle in the width direction of the traveling body and within the traveling body width. The front jib receiving frame 38 has a main body portion 29 of the tip side member 19 of the jib A, and the rear jib receiving frame 39 has a base side member. 1
8 are mounted and housed.

The base end member 18 is formed longer than the front end member main body 29, and the length of the base end member 18 (the length of the longest part of the jib when the jib is reduced) is the width of the traveling body. Is set smaller than.

Further, in FIGS. 7 and 8, 40 is a mounting member for collectively mounting both jib receiving frames 38 and 39 on the lower surface of the front bumper, 41 and 41 are outriggers on the front left and right sides, and 42 is a front wheel. Is.

Next, the procedure for extending the jib A will be described.

(A) As shown in FIGS. 7 and 8, the outrigger 4
1, and the boom 1 is tilted to the maximum as shown in FIG. 9, the auxiliary winding rope 17 (auxiliary hook 16) is loosened, and the auxiliary sheave bracket 10 is removed from the boom head 2.

(B) As shown in FIGS. 6 and 10, the jib feet 20 of the jib base end member 18 are engaged with the main hook storage metal shaft 8 and locked by the jib fixing pin 22.

(C) As shown in FIG. 10, the base end side member 1
8 is grounded, the base end portion of the main body portion 29 of the tip end side member 19 is connected to the connecting portion 18 of the base end side member 18.
It is fitted in b and is connected only by the front connecting pin 26.
At this time, the base end side member 18 and the tip end side member main body portion 29 are continuous in the state of being bent.

The base end side of the stopper 33 is attached to the boom head 2.

(D) As shown in FIG. 11, after the base end side of the tension rope 32 is fixed to the boom head 2, the boom 1 is slightly raised and the base end side member 18 and the tip end side member main body 29 are linearly formed. Then, these are permanently fixed by the rear connecting pin 27. At this time, the anti-rotation plate 28 prevents the tip side member main body portion 29 from excessively turning, and both are automatically arranged in a straight line, so that the main fixing work is simplified.

(E) The auxiliary sheave bracket 10 is attached to the tip of the tip side member body 29 by the pin 30. This completes the assembly of the jib A.

(F) As shown in FIG. 12, the boom 1 is slightly tilted to change the jib angle and the tip end side of the tension rope 32 is fixed to the jib A.

Thereafter, the boom 1 is raised to complete the attachment (extension) of the jib A.

The removal of the jib A is the reverse of this procedure.
The jib A that has been removed by operation is removed from the base member 18
And the main body portion 29 of the distal end side member 19 are separately stored in the jib storage portion 37 of the lower traveling body L. The auxiliary sheave bracket 10 is attached to the boom head 2 as before.

As described above, since the jib A can be disassembled and stored in the lower traveling body L when not in use, the jib A can be stored in the boom as in the prior art during crane work and traveling. The harmful effect of can be removed.

That is, since the jib A does not project to the side or the vertical direction of the boom 1, the jib A does not get in the way especially during crane work in a narrow space.

There is no increase in the boom weight due to the jib A and no reduction in the lifting capacity due to this.

There is no risk that the jib A will obstruct the field of view during traveling of the crane, and that the jib A will increase the boom center of gravity and impair traveling stability.

Further, according to this embodiment, (i) since the jib A is stored on the lower surface side of the lower traveling body L,
There is no possibility that the jib A interferes with the work or the operator stumbles on the jib A when the work is carried on the traveling body L as in the case of storing on the upper surface side.

(Ii) Since the jib A is stored under the front bumper 36 near the boom head 2 in the width direction, the jib A can be particularly easily transported and the efficiency of the jib overhanging / storing work can be improved.

(Iii) Since the lower surface side of the front bumper 36 is originally a dead space, when installing the jib housing 37, it is not necessary to make a large design change of the lower traveling body L, and the jib housing 37 can be easily installed. Can be easily installed.

Further, since the jib head (auxiliary sheave bracket 10) can be removed when the jib is stored, the length of the main body portion 29 of the distal end side member 19 is lengthened to increase the total length of the jib A in the jib extended state. can do.

Further, an auxiliary sheave bracket 10 which is not required during jib work is attached to the jib head and the auxiliary sheave 9 is used.
Since they can be used as jib point sheaves, the number of parts is reduced and the cost is low.

Other Embodiments (1) In the above embodiment, the jib A is divided into two parts, the base end side member 18 and the tip end side member 19, but when the jib length is long,
You may divide it into three or more.

(2) In the above embodiment, the auxiliary sheave bracket 10 is also used as the jib head, but a dedicated jib head may be used.

Further, the jib head may be integrally (non-detachably) provided on the main body portion 29 of the tip side member 19.

(3) In the above embodiment, both members are detachably connected by the pins 26 and 27 as a construction in which the jib A is switched between the extended state when it is extended and the contracted state when it is stored. , In place of this, the end portions of the jib constituent members that are connected to each other are formed into a tubular shape,
A configuration in which the tubular portions are mated with each other by male and female fitting and connected by pins (in this case, the tubular portions are formed in a trapezoidal shape in a plan view or a side view so that the clearance between the fitting surfaces becomes zero. (Although it may be configured), the jib components are pre-folded and connected so that they can be deployed, and they are expanded when they are extended and folded when they are stored.The jib components can be telescopically expanded and contracted like a telescopic boom. However, a configuration may be adopted in which the pins are extended and fixed at the time of overhang, and the pins are reduced when stored.

(4) It is most desirable to provide the jib storage portion 37 on the lower surface of the front end portion (front bumper 36) of the lower traveling body L as in the above embodiment, but below the rear end portion (rear bumper), Alternatively, if there is an empty space, it may be provided below the middle portion.

Alternatively, it may be provided in the hollow portion of the traveling body frame, or may be provided on the upper surface of the traveling body in the case of a crane having a large space for the upper surface, and travels on the condition that the vehicle fits within the vehicle width. It may be provided on the side of the body. Also,
It may be provided in the longitudinal direction of the traveling body or in an oblique direction.

[0069]

As described above, according to the present invention, the jib is configured to be convertible between the extended state when the jib is extended and the contracted state when the jib is retracted by a plurality of jib constituent members.
Since it is retracted when not in use and is stored in the jib storage part provided in the lower traveling structure, the adverse effect during crane work and traveling, which was caused by storing the jib in the boom as in the past, is narrowed. There is no danger of the jib obstructing the crane work at a place, the suspension capacity being reduced due to the increase in boom weight, the visibility of the crane traveling being obstructed, and the traveling stability being deteriorated.

According to the second aspect of the invention, since the jib is stored on the lower surface of the lower traveling body, the jib interferes with the work when riding on the traveling body as in the case of storing it on the upper surface. There is no danger that the worker will get stuck in the jib.

Further, according to the invention of claim 3, since the jib is stored at the front end portion of the traveling body, which is close to the boom head, the jib is particularly easy to carry and the jib projecting / storing work is efficient. Become.

In addition, when the jib storage portion is provided on the lower surface side of the front end portion of the traveling body, since the lower portion of the front end portion is originally a dead space, the jib storage portion can be easily and easily installed.

On the other hand, according to the invention of claim 4, since the length of the tip side member can be shortened by removing the jib head at the time of storing the jib, the length of the main body portion of the same member is lengthened accordingly. The total length of the jib in the extended state can be increased.

[Brief description of drawings]

FIG. 1 is a side view of a boom tip portion in a jib removed state showing an embodiment of the present invention.

FIG. 2 is a side view of the boom tip portion in the state where the jib is extended.

3 is a partially cutaway enlarged view of FIG. 1. FIG.

FIG. 4 is a partially cutaway enlarged view of FIG.

FIG. 5 is a perspective view of both a proximal end side member and a distal end side member which form the jib in the embodiment.

FIG. 6 is an enlarged cross-sectional view of a base end portion of the jib.

FIG. 7 is a side sectional view of the jib storage portion in the embodiment.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a side view showing the first stage of the jib overhanging procedure.

FIG. 10 is a side view showing the second stage.

FIG. 11 is a side view showing the third step.

FIG. 12 is a side view showing the fourth step.

[Explanation of symbols]

 A Jib 18 Base end member that constitutes a jib 19 Tip end member 20, 20 Jib foot 29 Body part of tip end member 10 Auxiliary sheave bracket that also serves as a jib head 13 Auxiliary sheave bracket mounting part 9 Auxiliary sheave (Jib point sheave ) L Undercarriage 37 Jib storage 36 Front bumper with jib storage 38, 39 Jib receiving frame that constitutes the jib storage

Claims (4)

[Claims] 1. A plurality of jib constituent members in a longitudinal direction including a distal end member having a jib point sheave at a distal end portion thereof and a proximal end member having a jib foot detachably attached to a boom head. In addition to being divided, each of the jib constituent members is configured to be convertible between an expanded state when extended and a contracted state when stored, while the jib storage section in which the jib is stored in the reduced state in the lower traveling body. A jib storage device for a wheeled crane, characterized by being provided with. 2. The jib storage device of a wheel type crane according to claim 1, wherein the jib storage portion is provided on a lower surface of the lower traveling body. 3. The length of the longest part of the jib in the contracted state is set to be equal to or less than the width dimension of the lower traveling body, and the jib storage portion is at the front end portion of the lower traveling body in the traveling body width direction and the traveling body width. The jib storage device of the wheel type crane according to claim 1 or 2, wherein the jib storage device is provided inside. 4. The jib head end member is composed of a main body and a jib head detachably attached to the main body, and the jib head is provided with a jib point sheave. The jib storage device of the wheel type crane in any one of 1 thru | or 3.