JPH0688757B2 - Jib retractor for vehicle-type crane - Google Patents

Description

The present invention relates to a jib storage device for a vehicle-type crane.

[Conventional technology]

Vehicle-type cranes such as truck cranes generally include a jib for supplementing the length of the boom.

This jib is extended toward the front of the boom by supporting the base end of the boom on the tip of the boom and rotating it around the base end.When not in use, direct the jib base end toward the boom tip side and It is stored along the boom with the boom facing toward the boom base end.

Vehicle-type cranes equipped with this jib include those that store the jib along the bottom surface of the boom and those that store the jib along the side surface of the boom.

However, the vehicle-type crane that stores the jib along the bottom of the boom allows the jib to be extended by rotating the jib vertically under the boom, so that the jib can be extended even in a narrow space. However, there is a problem that the view from the crane operation cab is obstructed by the jib under the boom during crane work with the jib stored.
Also, in a self-propelled crane that performs traveling operation and crane operation in the same cab, the jib under the boom obstructs the view from the cab when traveling with the boom contracted and lying down, so To increase the visibility, the boom must be mounted higher and the jib that is stowed along the bottom of the boom must be higher, so
There was a problem that the center of gravity of the vehicle-type crane was raised and the stability deteriorated.

On the other hand, the vehicle-type crane that stores the jib along the side of the boom does not have a jib under the boom, and therefore, the visibility from the cab can be widened without raising the boom mounting position. , Considering only the view from the cab,
It is advantageous over storing the jib along the bottom of the boom. However, the conventionally known type of vehicle-type crane is that the jib stored along the side of the boom is rotated laterally as it is and extended to the front of the boom. There was a problem that the jib could not be extended in a place where there was no space beyond the length of the jib.

Therefore, the applicant has filed Japanese Patent Application No. 57-166028 (Japanese Patent Application Laid-Open No. 59-5789).
Consider a vehicle-type crane as described in the specification and drawings of No. 0).

This vehicle-type crane stores the jib along the side of the boom, and when using the jib, first move the jib stored along the side of the boom to the bottom side of the boom and then The jib is rotated vertically under the boom so that the jib is extended. With this vehicle-shaped crane, the jib is stored along the side surface of the boom. The visibility from the driver's cab during traveling can be widened without raising the height, and since the jib can be pivoted in the vertical direction and extended, the jib can be extended even in a narrow space. .

[Problems to be Solved by the Invention]

However, in the above-described vehicle-type crane, the jib holder that holds the jib stored along the boom is supported by the two links pivotally attached to one side surface of the boom and the bottom surface of the boom. Had a problem that its mounting structure was rather complicated.

Further, in the above-mentioned vehicle-type crane, the transfer of the jib held by the jib holder from the boom lower surface side to the side surface side is performed, and the winch winding is hooked to the jib via the guide sheave provided at the upper edge of the boom. Then, the rope is wound up, and the movement from the side surface of the boom to the lower surface is performed by feeding the rope out of the winch and lowering the jib by its own weight. The replaced jib may swing while rotating the jib holder due to the turning of the boom and the like, and may interfere with surrounding structures or the like to cause damage or noise.

Therefore, in the above-mentioned vehicle-shaped crane, the swinging movement of the jib transferred to the lower surface side of the boom is restrained by fixing the jib holder to the boom with the lock pin,
To do this, it is necessary to push the heavy jib against the bottom surface of the boom by some means and insert the lock pin by aligning the pin hole on the jib holder with the pin hole on the boom side. Is required.

Moreover, in the above-described vehicle-type crane, when the jib transferred to the lower surface side of the boom is extended to the front of the boom, the winch winding line has to be removed from the jib.

Further, the vehicle-shaped crane, since the winch winding line is hooked on the jib at a location different from the jib holder, when the line is wound up and the jib is pulled up from the lower surface side of the boom to the side surface side, The jib holder holding the jib will rotate while resisting pulling up of the jib, and therefore, a twisting moment acts between the jib hooking part and the jib holder mounting part, causing the jib to move. It had the problem of being twisted and deformed.

The present invention has been made in view of the above circumstances, and the purpose thereof is to store the jib along the side surface of the boom and temporarily move the jib to the lower surface side of the boom when using the jib. Although it is designed to be extended to the front of the boom after replacement, it simplifies the jib holder mounting structure on the boom, and the jib transferred to the bottom side of the boom can be used without fixing the jib holder to the boom with the lock pin. The jib can be restrained in a steady state, and the jib can be extended without disconnecting the driving means for transferring the jib to the lower surface side and the side surface of the boom, and further, the jib is twisted and deformed. An object of the present invention is to provide a jib storage device for a vehicle-type crane, which can be transferred without the need.

[Means for Solving the Problems]

This invention, when storing the jib, stores the jib along the side surface of the boom with the base end facing the tip side of the boom and the tip facing the boom base end side. After transferring the jib from the side surface of the boom to the lower surface side, the base end of the jib is supported by the tip of the boom and the jib is rotated around the base end of the jib so that the jib is extended to the front of the boom for use. In a vehicle-type crane, a jib holder pivotally attached to a support shaft provided along the boom shaft on the side surface of the boom, and the jib holder provided on the boom and detachable from the jib are pivoted. A drive cylinder and a member provided on the boom and capable of locking the jib holder are provided.

[Action]

According to the present invention, since the jib holder is pivotally attached to the support shaft provided along the boom shaft on the side surface of the boom, the structure for attaching the jib holder to the boom is simple.

Further, according to the present invention, a jib holder drive cylinder is provided on the boom, the cylinder is pivotally attached to the jib holder, and the jib holder is rotated by the cylinder between a downward state and a sideways state. According to the present invention, since the rotation of the jib holder can be restrained by the cylinder, the jib transferred to the bottom surface of the boom can be locked by the lock pin. It is possible to restrain the jib holder without swinging it without fixing it to the boom.

Moreover, in the present invention, the cylinder, which is the drive means for transferring the jib to the lower surface side and the side surface side of the boom,
Because it is pivotally attached to the jib holder that holds this jib when it is stowed along the boom rather than on the jib,
It is not necessary to separate the cylinder when the jib is extended.

Further, in the present invention, since the jib holder is rotated by the jib holder drive cylinder, the jib is transferred to the lower surface side and the side surface side of the boom.
Unlike the case where the jib is pulled up and driven at a position different from the jib holder, a twisting moment does not act on the jib.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows a vehicle crane equipped with a jib.
In the figure, 1 is a vehicle body, 2 is a swivel base, 3 is a boom hoisting cylinder 4
The boom is a telescopic boom that is undulated by a sheave block 5 provided with a guide sheave 6 at the tip of the boom 3, and a rooster sheave 7 is provided at the end of the sheave block 5. In addition, 8 is a driver's cab which doubles as a traveling driver's cab and a crane operation cab, and 9 is an outrigger.

Further, 10 is a jib which supplements the length of the boom 3. This jib
10 is stored along the one side surface of the boom 3 with its base end facing the boom tip side and its tip facing the boom base end side. Then, the base end is supported by the boom tip end and is rotated about the base end, so that the boom 3 is extended to the front.

FIG. 2 shows the boom 3. The lower edge of one side of the boom 3 has a jib holder 11 for holding the base end side of the jib 10 and a jib support for supporting the tip end side of the jib 10. A bracket 12 and is provided. In FIG. 2, 13 is a guide sheave used when the jib 10 is extended and stored, and 14 is a bracket to which the rod of the boom hoisting cylinder 4 is attached.

FIG. 3 shows the jib 10. The jib 10 is a two-step jib that can be expanded and contracted, and the jib holder 11 is provided on the upper side (the side that becomes the lower side when the boom is extended forward). Holder mounting bracket 15 that is detachably fixed to
A bracket mounting plate 16 that is detachably supported by the jib supporting bracket 12 is fixed to the jib supporting bracket 12. The holder mounting bracket 15 and the bracket mounting plate 16 are provided on the base end side and the tip end side of the jib 10 with the center of gravity thereof (the center of gravity of the jib 10a retracted).

Further, forks 18, 18 that engage with jib support shafts 17 (see FIG. 1) projecting from both side surfaces of the sheave block 5 at the tip of the boom are provided on both sides of the base end portion of the jib 10a. A rope hooking portion 19 is provided on the tip end side of the jib 10.
In FIG. 3, reference numeral 21 is a guide sheave provided at the tip of the second stage jib 19a. Further, 22 is a tension rod that connects the tip of the jib 10 extended to the front of the boom and the tip of the boom 3, and the tension rod 22 is
The tip is pivotally attached to the tip of the jib 10, the tip is held by a rod support 20 provided on the base end side of the jib 10, and is attached along the jib 10.

On the other hand, the jib holder 11 has a jib receiving portion 11a for receiving the upper surface of the jib 10 and a rising portion 11b that rises from the central portion of the jib receiving portion 11a, as shown in FIGS. It is shaped like a letter and its rising part 11b
Is pivotally supported by a single support shaft 23 provided along the boom axis direction near the lower edge of one side surface of the boom 3, and is vertically rotatable with respect to the boom 3. The support shaft 23 is provided between the lower end portions of the pair of front and rear vertical members 24, 24 provided on the side surface of the boom 3.

This jib holder 11 is rotated by a jib holder drive cylinder 25 provided on the boom 3 between a horizontal state shown by a solid line in FIG. 4 and a downward state shown by a chain line in FIG. The base end of the cylinder 25 is pivotally supported on the upper ends of the pair of vertical members 24, 24, and is installed on the boom 3. The rod 25a of the cylinder 25 is pivotally attached to one end of the jib receiving portion 11a of the jib holder 11. There is.

Further, the portion of the jib 10 held by the jib holder 11 is provided with attachments 26, 26 on both side edges thereof in contact with both ends of the jib receiving portion 11a of the jib holder 11,
The jib 10 is a holder mounting bracket with the attachments 26, 26 received at both ends of the jib receiving portion 11a.
It is held by the jib holder 11 by connecting 15 to the jib holder 11 with a pin 27, and is removed from the jib holder 11 by removing the pin 27. In FIG. 6, 28, 28 are pin insertion holes provided in the holder mounting bracket 15 and the jib holder 11.

Further, a lock pin insertion hole 30 is provided in the vicinity of the cylinder connecting portion of the jib holder 11, and the jib holder 11 has the lock pin insertion hole 30 provided on the vertical members 24, 24. By inserting the lock pin 32 in accordance with the above, the state rotated laterally is locked. Incidentally, 33 is a stopper for receiving the jib holder 11 which is rotated in a lateral direction.

7 and 8 show an inserting / removing mechanism of the lock pin 32, and 32a is a lock pin inserting / removing rod connected to the lock pin 32. As shown in FIG. The rod 32a has a length reaching near the jib supporting bracket 12 (see FIG. 2) and is slidably supported by rod guides 34, 34 provided on the boom 3. Further, the end portion of the rod 32a is bent into an L shape to form a handle portion 32b, and the rod 32a is slid by the operation of moving the handle portion 32b to lock the lock pin 32 on the jib holder 11. It is designed to be inserted into and removed from the pin insertion hole 30.

A lock plate 36 that slides on a plate 35 provided on the boom 3 is provided at the end of the lock pin insertion / removal rod 32a.
Is fixed, and this lock pin insertion / removal rod 32a is
With the lock pin 32 inserted in the lock pin insertion hole 30 of the jib holder 11, the lock plate 36 is attached to the plate 35 and the pin 37
(See FIG. 2), it is locked so that it will not move due to vibration or the like. In FIG. 8, 38 and 39 are pin insertion holes provided in the lock plate 36 and the plate 35.

FIG. 9 shows the support structure of the jib 10 with respect to the jib support bracket 12 provided on the boom 3. The jib support bracket 12 is fixed to the lower end of a vertical rib 40 provided on the side surface of the boom 3. . The bracket mounting plate 16 fixed to the jib 10 is attached to the slide shaft 41 along the axial direction of the boom 3.
Is rotatably supported by the jib supporting bracket 12 by means of the jib supporting bracket 12 and is removed from the jib supporting bracket 12 by removing the slide shaft 41.

FIG. 10 shows an inserting / removing mechanism of the slide shaft 41.
Reference numeral 42 denotes a coil spring that is fitted to a rod 41a connected to the slide shaft 41 and presses the slide shaft 41 in the insertion direction thereof. The slide shaft 41 uses the spring force of the coil spring 42 to form the shaft hole 43 of the bracket mounting plate 16. It is designed to be inserted into.

Further, in FIG. 10, reference numeral 43 denotes a handle for removing the slide shaft provided on the base end side of the boom 3 (see FIG. 2). The handle 43 has a base end portion protruding from the side surface of the boom 3. It is pivotally supported by the supported support shaft 44 and is vertically rotatable. The base end of the handle 43 is bent obliquely downward, and the tip of the bent part 43a and the rod 41a of the slide shaft 41 are connected by a wire rope 45.

The slide shaft removing / removing handle 43 is rotated upward when the jib 10 is removed from the jib supporting bracket 12, and when the handle 43 is rotated upward, a bent portion thereof is formed.
The rotation of 43a causes the wire rod 45 to slide the slide shaft 41.
Is pulled, and the slide shaft 41 is pulled out from the bracket mounting plate 16 against the spring force of the coil spring 42.

Further, the tip end portion of the slide shaft 41 is inclined upward toward the tip end, and the slide shaft 41 is inclined by the bracket mounting plate 16 when the jib 10 is held under the boom 3. When the bracket mounting plate 16 is completely pushed into the jib supporting bracket 12 by being pushed back against the spring force of the coil spring 42, the axis of the bracket mounting plate 16 is automatically rotated by the spring force of the coil spring 42. It is designed to be inserted into the hole 43.

Next, the jib 10 stored along the side of the boom 3
To explain the operation to extend the boom toward the front of the boom, in this case, first extend the boom 3 slightly so that the base end of the jib 10 does not hit the sheave block 5 when the jib 10 is transferred to the lower side of the boom. In this state, the jib holder drive cylinder 25 is extended to rotate the jib holder 11 in the downward direction shown by the chain line in FIG.

When the jib holder 11 is turned downward as described above,
A jib 10 whose proximal end is held by the jib holder 11 and whose distal end is pivotally supported by the jib support bracket 12 pivots about the pivot center of the jib holder 11 and the jib pivotal fulcrum of the jib support bracket 12. , Being held on the lower surface of the boom 3.

In this case, since the jib holder 11 that holds the base end side of the jib 10 is pivotally supported near the lower edge of one side surface of the boom 3, the jib 10 is not supported.
Since the base end side of the jib rotates about the lower edge of one side surface of the boom 3, the tip side of the jib 10 is also pivotally supported by the bracket 12 fixed to the lower edge portion of the one side surface of the boom 3. Since the lower edge of one side of the boom 3 rotates, the jib 10
Are transferred to the lower surface side of the boom 3 without interfering with the boom 3.

FIG. 11 shows the attitude of the jib 10 with respect to the boom 3 at this time. The jib 10 has a base end located directly below the boom 3 and a tip end protruding to the side of the boom 3 from the boom side. It is held in a state of facing diagonally with respect to 3.

After transferring the jib 10 to the lower surface side of the boom 3 in this way, the boom 3 extended when transferring the jib 10 to the lower surface side of the boom 3 is contracted as shown in FIGS. 12 and 13.
Jib support shafts 1 projecting from both sides of the sheave block 5
Insert 7,17 into the fork 18,18 of jib 10
Insert the pin 46 into the tip of 8,18 to prevent the forks 18,18 from coming off the jib support shafts 17,17.

Next, the hoisting rope 47 of the crane is hooked around the guide sheave 6 and the rooster sheave 7 on the boom 3 side, the guide sheave 21 on the jib 10 side, and the guide sheave 13 on the boom base end, and the tip end thereof is Hang it on the rope hooking part 19 of the
Remove the pin 27 that secures the holder mounting bracket 15 to the jib holder 11 and the slide shaft 32 that pivotally supports the jib 10 to the jib support bracket 12 to remove the jib holder 11.
Remove the jib 10 from the strut and jib support bracket 12.

After that, the hoisting rope 47 is extended while raising the boom 3 to rotate the jib 10 around its base end by its own weight as shown in FIG. 14 to suspend the jib 10 from the boom tip. , Then the guide sheave 13 at the base of the boom
The jib 10 is extended in front of the boom 3 by removing the lifting rope 47 from the above and winding the lifting rope 47.

After the jib 10 is extended to the front of the boom in this way, the boom 3
With the wrench lying near the ground, remove the tip of the tension rod 22 attached to the jib 10 from the rod support 20 and attach it to the tension rod set pin 48 provided on the sheave block 5 of the boom 3 as shown in FIG. Install the rope as shown in Fig.
Remove 47, attach hook 49 to this lifting rope 47, and perform crane work.

Also, when storing the jib 10, the guide sheave of the jib 10
After the end of the hoisting rope 47 hung on 21 is hooked on the rope hooking portion 19 of the jib 10, the tension rod 22 is removed from the sheave block 5, and the tip is held by the rod support 20 of the jib 10, Lift the lifting rope 47 and let the jib 10 hang down from its boom tip by its own weight.
By hanging 47 on the guide sheave 13 at the base end of the boom (the tip of the hoisting rope 47 remains hooked on the rope hooking portion 19 of the jib 10) and hoisting the hoisting rope 47,
The jib 10 is rotated and held under the boom 3, and then the holder mounting bracket 15 of the jib 10 is fixed to the jib holder 11 by inserting the pin 27. The tip end of the jib 10 is automatically pivotally supported on the jib supporting bracket 12 by the slide shaft 41 when the jib 10 is held under the boom 3.

After that, the jib holder drive cylinder 25 is contracted to rotate the jib holder 11 in the sideways state, so that the jib 10 is rotated.
Is stored along the side surface of the boom 3, the jib holder 11 is locked to the boom 3 by the lock pin 32, and the storage of the jib 10 is completed.

Therefore, in the jib storage device, the jib holder 11
Is pivoted on a single support shaft 23 provided near the lower edge of one side of the boom 3, so that the jib holder 11 can be easily attached to the boom 3.

Further, in the jib storage device, the boom 3 is provided with a jib holder drive cylinder 25, the cylinder 25 is pivotally attached to the jib holder 11, and the jib holder 11 is rotated by the cylinder 25 between a downward state and a sideways state. The jib 10 held by the jib holder 11 is transferred to the lower surface side and the side surface side of the boom 3. According to this jib storage device, the rotation of the jib holder 11 can be bound by the cylinder 25. , The jib 11 transferred to the bottom side of the boom 3,
It is possible to hold the jib holder 11 in a steady state without fixing it to the boom 3 by the lock pin.

Moreover, in the above-mentioned jib storage device, the cylinder 25, which is a drive means for transferring the jib 11 to the lower surface side and the side surface side of the boom 3, is stored not along the jib 10 but along the boom 3. Since it is pivotally attached to the jib holder 11 that holds the jib 10 when the jib 10 is extended, it is not necessary to separate the cylinder 25 when the jib 10 is extended.

Further, in the above-mentioned jib storage device, the jib holder drive cylinder 25 rotates the jib holder 11 to rotate the jib holder 11.
Since the 10 is moved to the lower surface side and the side surface side of the boom 3, the twisting moment does not act on the jib 10, unlike when the jib 10 is pulled up and driven at a position different from the jib holder 11. .

Therefore, according to the above-mentioned jib storage device, the jib 10 can be moved to the boom 3
The jib 10 is stored along the side surface of the boom 3, and when the jib 10 is used, the jib 10 is temporarily moved to the lower surface side of the boom 3 and then extended in front of the boom 3. The jib 10 having a simple mounting structure and transferred to the lower surface side of the boom 3 can be restrained from swinging without fixing the jib holder 11 to the boom 3 by the lock pin, and the jib 10 can be restrained. The jib 10 can be extended without disconnecting the driving means (the jib holder driving cylinder 25) for transferring the lower surface side to the side surface side, and further, the transfer can be performed without causing the jib 10 to be twisted and deformed. Can be done.

Although the jib 10 is a two-stage jib in the above embodiment, the jib 10 may be a single-stage jib.

〔The invention's effect〕

According to the present invention, the jib is stored along the side surface of the boom, and when the jib is used, the jib is temporarily moved to the lower surface side of the boom and then is extended to the front of the boom. The installation structure of the jib holder can be simplified, and the jib that has been transferred to the bottom side of the boom can be restrained from swinging without fixing the jib holder to the boom with the lock pin. The jib can be extended without disconnecting the driving means for transferring to the side surface side, and further, the transfer can be performed without causing the jib to be twisted and deformed.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of a vehicle crane equipped with a jib in a state where the jib is stored, Fig. 2 is an enlarged side view of a boom, and Fig. 3 is an enlarged view of the jib. FIG. 5 is a side view, FIG. 4 is an enlarged sectional view taken along line AA of FIG.
6 and 6 are a side view and a vertical sectional view in a state where the jib is removed from the jib holder, FIG. 7 is an enlarged sectional view taken along the line CC of FIG. 5, and FIG. 8 is a plan view of a part of FIG. Fig. 9 is an enlarged sectional view taken along the line BB in Fig. 1, and Fig. 10 is D in Fig. 9.
Fig. 11 is an enlarged cross-sectional view taken along line -D, Fig. 11 is a plan view showing the jib transferred to the lower surface of the boom, and Figs. 12 and 13 show the jib base end hooked on the boom tip. A plan view and a side view, FIG. 14 is a side view showing a state in which the jib is being extended,
FIG. 15 is a side view showing a state where the jib is extended. 3 …… Boom, 10 …… Jib, 11 …… Jib holder, 23 ……
Support shaft, 25 ... Jib holder drive cylinder.

Claims (1)

[Claims] 1. When storing a jib, the jib is stored along the side surface of the boom with the base end of the jib facing the tip of the boom and the tip facing the boom base. A type that is used by extending the jib from the side surface of the boom to the lower surface side and then supporting the base end of the jib on the tip of the boom and rotating the jib around the base end of the jib to extend to the front of the boom. In the vehicle-shaped crane of No. 3, the jib holder pivotally attached to a support shaft provided along the boom shaft on the side surface of the boom and the jib holder provided on the boom and detachable from the jib are pivoted. A jib storage device for a vehicular crane, comprising: a drive cylinder for operating the boom; and a member provided on the boom for locking the jib holder.