JP2726006B2 - Wheel crane jib containment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003]

However, the conventional method of storing the jib in the boom as described above has the following disadvantages.

[0004] Since the jib projects to the side or in the vertical direction of the boom, the jib becomes an obstacle particularly during crane work in a narrow place.

[0005] Since the jib increases the weight of the boom, the lifting capacity is reduced.

[0006] In particular, according to the upper and lower hugging methods, the jib obstructs the view of the crane when traveling.

In the case of the upper holding method, the center of gravity of the boom is increased by the jib, and running stability is deteriorated.

SUMMARY OF THE INVENTION The present invention provides a jib storage device for a wheel crane which does not cause any adverse effects associated with the storage of the jib as described above.

[0009]

According to the first aspect of the present invention, a jib has a distal end member having a jib point sheave at a distal end portion, and a proximal end member having a jib foot detachably attached to a boom head. Is divided into a plurality of jib component members in the longitudinal direction, and the jib component members are configured to be switchable between an extended state when extended and a contracted state when retracted. Is provided with a jib storage unit for storing the data in the reduced state.

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

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

According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the distal end side member of the jib comprises:
And a jib head detachably attached to the main body. The jib head is provided with a rope guide sheave.

[0013]

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

[0014] Therefore, it is possible to eliminate all the adverse effects at the time of crane operation and traveling caused by storing the jib in the boom as in the related art.

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 hinders the work when the operator rides on the traveling body as in the case of storing the jib on the upper surface. There is no danger of the operator falling over and the operator tripping over the jib.

Further, according to the third aspect of the present invention, the jib is stored at a position near the boom head, that is, at the front end of the traveling body, so that the jib can be transported particularly easily and the jib overhanging / storing operation can be performed efficiently. Become.

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

On the other hand, according to the fourth aspect of the present invention, the jib head can be detached when the jib is stored to shorten the length of the distal end side member. The total length of the jib in the state can be lengthened.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

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

In these figures, reference numeral 1 denotes a boom, and 2 denotes a boom head (boom tip). Inside the boom head 2, an idler, both main sheaves 3, 4 and a lower surface (in a state where the boom 1 is tilted horizontally) The main hook storage fittings 5 are respectively provided on the lower surface of the main hook storage bracket 5 and the outer direction of the main hook 5 below. Stored below.

Reference numeral 8 denotes a main hook storage metal shaft which is a center of rotation of the main hook storage metal 5.

An auxiliary sheave bracket 10 having an auxiliary sheave 9 for auxiliary hoisting rope guide is mounted on the front side of the boom head 2. When the jib is mounted, the auxiliary sheave bracket 10 is mounted as shown in FIGS. 10 is attached to the jib tip so as to be used as a jib head.

The auxiliary sheave bracket 10 has a structure shown in FIGS.
As shown in the figure below, a downwardly facing contact surface 1
1. A rectangular cylindrical mounting portion 13 having a pin hole 12 on the upper side
Are provided respectively.

When the auxiliary sheave bracket 10 is not mounted on the jib, the mounting portion 13 is inserted into the boom head 2 with the contact surface 11 engaged with the main hook housing bracket shaft 8 and mounted by the pin 14. Can be

An auxiliary hook storage member 15 is attached to the tip of the auxiliary sheave bracket 10 so as to be rotatable about a horizontal axis.
By the hoisting force of No. 7, it is stored together with the auxiliary hook storing hardware 15 under the boom head (the state of the phantom line in FIG. 3).

The jib A is a square pipe-shaped base member 18.
Is similarly divided into a square pipe-shaped tip-side member 19,
The two members 18 and 19 are configured to be switchable between an assembled state (extended state) and a disassembled state (reduced state).

As shown in FIGS. 5 and 6, the base member 18 has left and right bifurcated legs 18a, 18a at the base end. The main hooks are attached to the distal ends of the legs 18a, 18a when the jib is mounted. Downward bifurcated jib foot 2 that engages with housing bracket 8
0 and 20 are provided.

As shown in FIG. 6, both legs 18a,
Plate-shaped pin guides 21 and 21 are provided between 18 a and between the two jib feet 20, 20, and a jib fixing pin 22 is inserted across the two pin guides 21 and 21.

The jib fixing pin 22 is moved back and forth between a jib fixing position protruding toward the jib foot as shown by a solid line in FIG. 6 and a fixing releasing position retracting toward the legs 18a and 18a as shown by the imaginary line. (In the jib length direction), and the jib fixing pins 22 are set at the jib fixing positions in a state where the jib feet 20 and 20 are engaged with the main hook storing bracket shaft 8, whereby the jib feet 20 and 20 are set. Is prevented from coming off with respect to the main hook storing bracket shaft 8.

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

A bifurcated connecting portion 18b is provided on the distal end side of the base end member 18. The base end of the distal end member 19 is fitted into the connecting portion 18b to connect two front and rear connecting pins (hereinafter referred to as two connecting pins). , Front connection pins and rear connection pins) 26, 27.

A detent plate 28 is provided on the upper surface of the distal end portion of the proximal member 18 so as to face the connecting portion 18b.
The rotation in one direction 9 is stopped by the rotation preventing plate 28.

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

That is, the pin hole 3 is
0 is provided penetrating right and left, and when the jib is extended, the pin holes 12 and 30 of the auxiliary sheave bracket 10 are mutually fitted in a state where the mounting portion 13 of the auxiliary sheave bracket 10 is fitted into the distal end portion of the main body portion 29.
The auxiliary sheave bracket 10 is attached to the distal end of the main body 29 by inserting the pin 31 into the distal end member 19 to form the distal end member 19.

As shown in FIGS. 2 and 4, the jib A is inserted into the boom head 2 so that the jib foot 20 is engaged with the main hook storing bracket shaft 8 and is prevented from being removed by the jib fixing pin 22. Attached to the boom head 2 in the state,
It is supported by a tension rope 32 suspended between the boom head 2 and the jib tip.

Further, a stopper 33 is attached between the base end of the jib and the boom head 2, and the stopper 33 prevents the jib A from being turned upside down during the jib operation. Reference numeral 34 denotes 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 turned forward as shown in FIG. 8, and the front end in the inverted state is fixed to the storage bracket 35 with pins.

On the other hand, FIGS. 7 and 8 show the configuration of a jib storage unit for storing 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, 36 is a front bumper provided at the front end of the carrier frame C,
A jib storage 37 is provided below the front bumper 36.

The jib storage section 37 has two jib receiving frames 38, 3 having a U-shaped cross section shorter than the width dimension of the lower traveling body L.
9 is a front bumper 36 in a horizontal state adjacent to the front and rear.
The main body 29 of the distal end member 19 of the jib A is mounted on the front jib receiving frame 38 and the base end member is mounted on the rear jib receiving frame 39 on the lower surface of the vehicle. 1
8 are placed and accommodated, respectively.

The proximal member 18 is formed longer than the distal member body 29. The length of the proximal member 18 (the length of the longest part of the jib when the jib is reduced) is determined by the width of the running body. It is set smaller than.

7 and 8, reference numeral 40 denotes a mounting member for mounting the two jib receiving frames 38, 39 collectively on the lower surface of the front bumper, 41, 41 denote outriggers on both front left and right sides, and 42 denotes front wheels. It is.

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

(A) As shown in FIGS.
With the boom 1 fully tilted as shown in FIG. 9, the auxiliary 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, 20 of the jib base end member 18 are engaged with the main hook storing bracket shaft 8 and locked by the jib fixing pins 22.

(C) As shown in FIG.
With the distal end of the base member 8 grounded, the proximal end of the main body 29 in the distal member 19 is connected to the connecting portion 18 of the proximal member 18.
and is connected only by the front connection pin 26.
At this time, the proximal end member 18 and the distal end member main body 29 continue in a folded state.

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

(D) After the base end side of the tension rope 32 is fixed to the boom head 2 as shown in FIG. 11, the boom 1 is slightly raised and the base end member 18 and the front end member main body 29 are straightened. And these are permanently fixed by the rear connecting pin 27. At this time, the rotation-preventing plate 28 prevents the tip-side member main body portion 29 from excessively rotating, and the two are automatically and linearly arranged, so that the above-mentioned main fixing work is simplified.

(E) The auxiliary sheave bracket 10 is attached to the distal end of the distal end member main body 29 with the pin 30. Thereby, the assembly of the jib A is completed.

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

Thereafter, by raising the boom 1, the attachment (extension) of the jib A is completed.

Removal of Jib A is the reverse procedure.
The jib A that is removed by operation is removed by the proximal member 18.
And the main body 29 of the distal end member 19 are stored in the jib storage 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 lower traveling body L during crane operation and traveling, which is caused by storing the jib in the boom as in the conventional case. Can be eliminated.

That is, since the jib A does not protrude to the side or the vertical direction of the boom 1, the jib A does not hinder the crane operation particularly in a narrow place.

There is no increase in the boom weight due to the jib A, and there is no reduction in the suspending ability due to this.

There is no danger that the jib A will obstruct the field of view when the crane is traveling, and that the jib A will increase the center of gravity of the boom and deteriorate running stability.

According to this embodiment, (i) the jib A is stored on the lower surface side of the lower traveling body L,
There is no risk that the jib A will obstruct the work when the user rides on the traveling body L and performs the work, as in the case where the jib A is stored on the upper surface side, and there is no risk that the operator will trip over the jib A.

(Ii) Since the jib A is stored in the width direction below the front bumper 36 near the boom head 2, the transportation of the jib A becomes particularly easy, and the efficiency of the jib overhanging / storing operation is improved.

(Iii) Since the lower surface side of the front bumper 36 is originally a dead space, a large change in the design of the lower traveling body L is not required when installing the jib storage section 37, and the jib storage section 37 is easily formed. 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 29 of the distal end member 19 is increased to increase the total length of the jib A in the jib extended state. can do.

Further, the auxiliary sheave bracket 10 which becomes unnecessary during the jib operation is attached to the jib head and the auxiliary sheave 9
Can also be used for the jib point sheave, reducing the number of parts and reducing the cost.

Other Embodiments (1) In the above embodiment, the jib A is divided into the base end member 18 and the distal end member 19, but when the jib length is long,
It may be divided into three or more.

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

The jib head may be provided integrally (non-detachable) with the main body 29 of the distal end member 19.

(3) In the above embodiment, the jib A is switched between the extended state when extended and the contracted state when retracted, so that both members are detachably connected to each other by the pins 26 and 27. Instead of this, the ends of the jib components that are connected to each other are formed in a cylindrical shape,
A configuration in which the cylindrical portions are fitted together by male and female and connected by pins (in this case, the cylindrical portion is formed in a trapezoidal shape in a plan view or a side view, and the gap between the fitting surfaces is made zero). The jib components can be folded and unfolded beforehand, and can be unfolded when extended and folded when stored. The jib components can be telescopically extended and retracted like a telescopic boom. Alternatively, a configuration may be adopted in which the pin is extended and fixed at the time of extension, and reduced at the time of storage.

(4) The jib storage section 37 is most preferably provided on the lower surface of the front end (front bumper 36) of the lower traveling body L as in the above-described embodiment, but is preferably provided below the rear end (rear bumper). Alternatively, if there is an empty space, it may be provided below the intermediate 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 sufficient space on the upper surface. It may be provided on the side of the body. Also,
It may be provided in the running body length direction or the oblique direction.

[0069]

As described above, according to the present invention, the jib is configured to be switchable between an extended state at the time of extension and a contracted state at the time of storage by a plurality of jib constituent members.
When the jib is not in use, it is stored in the jib storage part provided in the lower traveling body in the reduced state, so the crane work and traveling adverse effects caused by storing the jib in the boom as in the prior art, that is, narrowing There is no risk that the jib will be in the way during crane work in the place, the lifting capacity will be reduced due to the increase in the boom weight, the visibility when the crane is running, or the running stability will be degraded.

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 hinders the work when the operator works on the traveling body as in the case where the jib is stored on the upper surface. There is no danger of the operator falling over and the operator tripping over the jib.

Further, according to the third aspect of the present invention, the jib is stored at a position near the boom head, that is, at the front end of the traveling body, so that the jib can be transported particularly easily and the jib overhanging / retracting work can be performed efficiently. Become.

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

On the other hand, according to the fourth aspect of the present invention, the jib head can be removed when the jib is stored, and the length of the distal end member can be shortened. The overall length of the jib in the extended state can be lengthened.

[Brief description of the drawings]

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

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

FIG. 3 is a partially cut-away enlarged view of FIG. 1;

FIG. 4 is a partially cutaway enlarged view of FIG. 2;

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

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

FIG. 7 is a side sectional view of a jib storing unit in the embodiment.

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

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

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

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

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

[Explanation of symbols]

 Reference Signs List A jib 18 proximal end member constituting jib 19 distal end member 20, 20 jib foot 29 main body portion of distal end member 10 auxiliary sheave bracket shared with jib head 13 auxiliary sheave bracket mounting portion 9 auxiliary sheave (jib point sheave ) L Undercarriage 37 Jib storage section 36 Front bumper 38, 39 provided with jib storage section Jib receiving frame constituting jib storage section

Claims (4)

(57) [Claims] 1. A jib comprising a plurality of jib components in a longitudinal direction including a distal member having a jib point sheave at a distal portion and a proximal member having a jib foot detachably attached to a boom head. The jib is divided and can be switched between an extended state at the time of extension and a contracted state at the time of storage by each of these jib constituent members. A jib storage device for a wheel-type crane, comprising: 2. The jib storage device for a wheel 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 smaller than the width of the lower traveling body, and the jib storage portion is provided at the front end of the lower traveling body in the traveling body width direction and the traveling body width. The jib storage device for a wheel type crane according to claim 1 or 2, wherein the jib storage device is provided in the jig. 4. A jib tip side member comprising a main body portion and a jib head detachably attached to the main body portion, wherein a jib point sheave is provided on the jib head. The jib storage device for a wheel type crane according to any one of claims 1 to 3.