JP4447362B2 - Auxiliary jib device for wheel crane - Google Patents

Description

  The present invention relates to an auxiliary jib device for a wheel crane that is attached to the tip of a telescopic boom during jib work and is stored on the lower surface of the telescopic boom when not in use.

  A wheel crane, such as a rough terrain crane, has a swivel mounted on the vehicle unit so that the swivel can be swung freely. A driver's cab that is used for both vehicle travel and crane operation is provided.

  In recent years, focusing on relatively small wheel cranes, the telescopic boom is retracted to the side of the cab below the eye point of the cab when traveling for the purpose of improving driving visibility during driving. (See, for example, Patent Document 1). In this way, the arrangement of the telescopic boom of the type in which the telescopic boom is positioned below the eye point of the driver's cab during travel is hereinafter referred to as a “lower boom”.

  The applicant of the present application has filed an application for an auxiliary jib device suitable for a wheel crane provided with the lower boom (see, for example, Patent Document 2). 6 is a detailed view in which the auxiliary jib 1 is stored along the lower surface of the telescopic boom 2, and FIG. 7 is a view as seen from the direction of arrow A in FIG. The type of auxiliary jib stored on the lower surface of the telescopic boom as shown in FIGS. 6 and 7 is hereinafter referred to as “under-holding jib”.

  The jib 1 has a substantially Y shape as a whole, and its base end side 3 has a bifurcated shape that can be engaged with both sides of the boom tip lower part. Further, the tip side of the jib 1 has a box structure with a uniform cross section. Two tension rods 5 are arranged in a side-view polymerization of the jib 1.

  In a wheel crane equipped with a lower boom, the forward view on the opposite side of the telescopic boom 2 from the eye point of the cab during traveling is determined by the height of the upper surface of the telescopic boom 2, so It is desired that the height of the boom 2 is low, that is, the telescopic boom 2 is as close to the vehicle portion as possible.

  On the other hand, since the auxiliary jib is stored between the telescopic boom 2 during traveling and the vehicle unit, the height of the telescopic boom 2 during storage is increased by the height dimension of the auxiliary jib during storage. Is inevitable. Therefore, it is desirable that the lower crane is a lower boom, and the height of the auxiliary jib when stored is as small as possible.

  Furthermore, since the user of the wheel crane wants to be able to run with the outrigger laying iron plate mounted on the upper surface of the vehicle portion, the space between the telescopic boom 2 and the vehicle portion when stored can be mounted on the laying iron plate. It is also necessary to leave a space.

In the above-described points, the auxiliary jib device of the above-mentioned patent document 2 is equipped with a laying iron plate because the height dimension of the jib 1 at the time of storage becomes the height dimension of the entire auxiliary jib and the height dimension of the tension rod 5 does not affect. However, it was convenient because the increase in the height of the telescopic boom during storage could be reduced as much as possible.
JP-A-3-249095 (page 5-8, Fig. 1) Japanese Patent Laid-Open No. 2002-3171 (page 3-4, FIGS. 2 and 3)

  In general, the tension rod of the auxiliary jib device is required to have such a length that the tension rod base end is located in the vicinity of the jib base end 6 with the tip end of the tension rod being connected to the proper position of the jib tip when the jib is extended. However, since the tension rod 5 of the auxiliary jib device of Patent Document 2 is stored along the box structure portion on the distal end side 4 of the auxiliary jib 1 during its storage, the length during storage of the auxiliary jib 1 is the same as that of the auxiliary jib 1. It is considerably shorter than the length. For this reason, the length adjusting portion of the tension rod 4 becomes very long in order to reach the required length when the jib is extended.

  The length adjusting section of the tension rod 4 is a combination of a long outer member having a hollow rectangular cross section and a long inner member having a solid rectangular cross section that can be inserted into the cross section. The length can be adjusted by inserting / removing the length adjusting pin 7 shown in FIG. However, since the length adjusting unit having the above-described configuration is very difficult to manufacture in terms of production, and the cost is increased, it is desirable that the length adjusting unit is as short as possible.

  Note that when the auxiliary jib device is attached to the tip of the telescopic boom, the length adjusting unit is the minimum necessary for changing the tilt angle so that the tilt angle of the jib body relative to the telescopic boom can be changed in several steps. The length of is necessary.

  For the above reasons, in order to manufacture the tension rod easily and inexpensively, it is necessary to shorten the length adjusting portion as much as possible and lengthen the fixed length portion other than the length adjusting portion. Then, since the tension rod at the time of storing becomes long as a result, when the tension rod is stored, the tension rod must be stored at a position below the jib.

  Therefore, the present invention presupposes a lower crane, a lower holding jib, and a wheel crane provided with an auxiliary jib for storing the tension rod below the jib, and the height of the telescopic boom during storage (running). It is an object of the present invention to provide an auxiliary jib device for a wheel crane capable of mounting a laying iron plate in a space between a telescopic boom and a vehicle unit without increasing the height.

  An auxiliary jib device for a wheel crane according to claim 1 of the present application includes a swivel mounted on a vehicle unit so that the swivel can be swung freely. It is intended for an auxiliary jib device for a wheel crane in which a driver's cab for both vehicle running and crane operation is located at the side, and the telescopic boom is stored so as to be positioned below the eye point of the driver's cab when traveling.

  Further, the auxiliary jib device described in claim 1 of the present application is substantially Y-shaped as a whole, and has a bifurcated base end portion that can be engaged with the engaging portions on the left and right of the lower end of the telescopic boom tip. In the state where the jib is extended to the distal end of the telescopic boom, the front end of the jib is coupled to a jib-side tension rod coupling portion provided on the upper surface of the jib distal end, and the base end portion is coupled to the left and right coupling portions of the telescopic boom distal end. A pair of tension rods to be coupled, and a tension rod coupling portion at the time of storage disposed on one side of the bifurcated base end portion of the jib on the same side as the jib side tension rod coupling portion. And when the jib is stored in the telescopic boom, the jib faces the base end of the telescopic boom toward the distal end of the telescopic boom, the front end toward the base end of the telescopic boom, and the jib side tensioner. The rod connecting portion and the retracting tension rod connecting portion are stored in a downward orientation, and the tension rod is connected to the jib-side tension rod connecting portion while the base end portion is stored in the retracting tension rod. By being connected to the connecting portion, the pair of tension rods are positioned below the jib and stored side by side.

  The wheel crane described in claim 1 of the present application is an underarm boom that stores the telescopic boom so as to be positioned below the eye point of the cab during traveling, and when the jib is stored in the telescopic boom. The jib has its base end facing the distal end of the telescopic boom on the lower surface of the telescopic boom, its front end facing the base end of the telescopic boom, and the jib-side tension rod connecting portion and the retracting tension rod connecting portion facing downward. It is a lower hug jib stored in a different posture.

  However, the tension rod of the auxiliary jib device is connected to the tension rod connecting portion at the time of storage while the tip end portion is connected to the jib-side tension rod connecting portion, so that the pair of tension rods can Since it is located on the lower side and stored side by side, the tension rod does not exist at the other base end portion of the auxiliary jib, and the laying iron plate can be mounted in the space formed thereby.

  That is, although it is a relatively long tension rod that can be manufactured easily and inexpensively, as with the auxiliary jib device described in Patent Document 2, the lower part of the telescopic boom when retracted regardless of the height dimension of the tension rod. A laid iron plate can be mounted between the auxiliary jib stored in the vehicle and the vehicle part. Therefore, it is possible to travel to the crane work site with the laying iron plate mounted on the wheel crane, which contributes to the improvement of work efficiency.

  FIG. 1 shows a wheel crane 10 according to the best mode for carrying out the present invention. The wheel crane 10 has a swivel base 12 mounted on a vehicle unit 11 so as to be turnable, and a telescopic boom 13 is pivotally attached to the turntable 12 so as to be raised and lowered. The wheel crane 10 is disposed on the swivel base 12 on the side of the telescopic boom 13 and is provided with a cab 14 for traveling and crane operation.

FIG. 1 shows the wheel crane 10 during travel, and the telescopic boom 13 is attached to the cab 14.
It is stored so as to be located below the in point 15. An auxiliary jib device 20 is stored on the lower surface of the telescopic boom 13.

  FIG. 2 is a detailed view of the auxiliary jib device 20 of the wheel crane 10 shown in FIG. FIG. 3 is a view taken in the direction of arrow B in FIG. Hereinafter, the configuration of the auxiliary jib apparatus 20 according to the embodiment of the present invention will be described with reference to FIGS. 2 and 3.

  The auxiliary jib device 20 includes a jib 21 and a pair of tension rods 22. The jib 21 is generally Y-shaped as a whole, and has a bifurcated base end portion 23 that can be engaged with engaging portions 26 on both sides of the lower end of the distal end of the telescopic boom 13 on the base end side. A U-shaped jib side engaging member 27 is attached to the distal end of the bifurcated base end portion 23.

  The tip side of the jib 21 is a tip box structure portion 24 having a uniform cross section, and a pair of sheave support plates 29 that rotatably support the sheave 28 are attached to the tip thereof. The bifurcated base end portion 23 and the tip box structure portion 24 of the jib 21 are connected by an intermediate connecting portion 30 to be integrated.

  The tension rod 22 includes a length adjusting portion 31, a pipe material portion 32, a distal end connecting portion 33, and a proximal end connecting portion 34 that are integrated. The length adjusting unit 31 is configured by combining an outer member having a hollow rectangular cross section and a solid rectangular inner member that can be inserted into the outer member. Then, a plurality of adjustment pin holes are formed along the longitudinal direction of the outer member, and the length can be adjusted by inserting / removing the length adjustment pins 35 shown in FIG. 2 into the adjustment pin holes. Yes.

  The length adjusting unit 31 having the above configuration is very difficult to manufacture in terms of manufacturing and causes a cost increase. However, the length adjusting unit 31 of the tension rod 22 of the auxiliary jib device according to the present invention is as shown in FIG. The length is as short as L, which is the minimum length necessary for tilt angle adjustment during jib work. Therefore, the tension rod 22 according to the present invention is easy to make and low cost because the ratio of the length of the pipe member 32 to the entire length is large.

  The tip connecting portion 33 of the tension rod 22 is connected to a jib side tension rod connecting portion 36 provided in the tip box structure portion 24 of the jib 21. The tip connecting portion 33 and the jib side tension rod connecting portion 36 are connected using a pin, and the tension rod 22 can swing around the tip connecting portion 33.

  Each of the two tension rods 22 is connected to a tension rod connecting portion 37 at the time of storage at a base end connecting portion 34 arranged at one of the bifurcated base end portions 23 of the jib 21 by a connecting pin 38 that can be freely inserted and removed. Yes. The retracting tension rod connecting portion 37 is constituted by two plates having holes for connecting pins 38 standing in parallel so that the base end connecting portion 34 of the tension rod 22 can be connected. When the jib 21 is extended to the distal end of the telescopic boom 13 and the jib operation is performed, the base end coupling portion 34 of the tension rod 22 is coupled to the left and right coupling portions 39 at the distal end of the telescopic boom 13. Yes.

  2 and 3 show a state where two tension rods 22 are stored in the jib 21. The tension rod 22 is positioned on one surface of the jib 21 by connecting the base end connecting portion 34 to the tension rod connecting portion 37 during storage while the distal end connecting portion 33 is connected to the jib side tension rod connecting portion 36. And stored side by side.

  Actions and effects when the auxiliary jib device 20 having the above configuration is mounted on the wheel crane 10 are as follows.

  FIG. 4 shows a detailed view of the traveling posture of the wheel crane 10 in which the jib device 20 is stored on the lower surface of the telescopic boom 13. 5 is a view taken in the direction of arrow C in FIG.

  As shown in FIG. 5, the jib 21 is stored on the lower surface of the telescopic boom 13 in such a posture that the bifurcated base end portion 23 faces the distal end of the telescopic boom 13 and the distal end portion 24 faces the base end of the telescopic boom. Has been. The jib side tension rod connecting portion 36 and the retracting tension rod connecting portion 37 provided in the jib 21 are stored in a posture in which they are directed downward.

  In order to avoid the hoisting cylinder rod side support 42 provided on the lower surface of the telescopic boom 13, the jib 21 is positioned by swinging its tip to the side opposite to the cab 14. The two tension rods 22 are located below the jib 21 and are stored side by side on the side 23a of the bifurcated base end.

  Reference numeral 40 denotes a stack of four laid iron plates, which is mounted on the vehicle frame 41 of the vehicle unit 11 of the wheel crane. The laying iron plate 40 is for reducing the installation pressure of the float when the ground on which the outrigger float is installed is soft. For example, the length of one side is a square of about 1 meter, and the thickness thereof is An iron plate of about a few tens of millimeters is often used, and the occupied space is considerably large.

  However, according to the auxiliary jib device 20 of the present application, since the tension rod 22 does not exist at the other base end portion 23b of the jib 21, the laying iron plate 40 can be mounted in the space formed thereby.

  That is, while the tension rod 22 is relatively long and can be manufactured easily and inexpensively, as with the auxiliary jib device described in Patent Document 2, the telescopic boom when retracted regardless of the height dimension of the tension rod 22 13 can be mounted between the jib 21 stored below 13 and the vehicle frame 41.

  In the above-described auxiliary jib device, the embodiment has been described on the assumption that two tension rods 22 are used. However, the technical idea of the present invention can be applied even if there is only one tension rod. .

  That is, the auxiliary jib device has a substantially Y-shape as a whole and has a bifurcated base end portion that can be engaged with the left and right engaging portions at the lower end of the telescopic boom tip, and the jib at the distal end of the telescopic boom. In the overhanging state, the tip portion is connected to the jib side tension rod connecting portion provided on the upper surface of the jib tip portion, and one tension rod that connects the base end portion to the connecting portion in the upper end of the telescopic boom tip, A retracting tension rod connecting portion disposed on one of the bifurcated base end portions of the jib on the same side as the jib side tension rod connecting portion, and storing the jib in the telescopic boom When the jib is attached, the base end of the jib is directed toward the tip of the telescopic boom on the lower surface of the telescopic boom, the tip thereof is directed to the base of the telescopic boom, and the jib side tension rod connecting portion and the tension at the time of storage are stored. The tension rod is stored in a posture in which the rod connecting portion is directed downward, and the tension rod is connected to the tension rod connecting portion at the time of storage while the distal end portion is connected to the jib side tension rod connecting portion. One tension rod is located below the jib and is stored along one of the bifurcated base ends.

  With the above configuration, since the tension rod does not exist at the other base end portion of the auxiliary jib, the present invention has the same effect as that of the present invention in which the laying iron plate can be mounted in the space formed thereby.

1 is a wheel crane according to a best embodiment. It is detail drawing of an auxiliary | assistant jib apparatus. FIG. It is detail drawing of the running posture of a wheel crane. It is C arrow line view of FIG. It is an auxiliary jib apparatus of patent documents 2. It is A arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Wheel crane 11: Vehicle part 12: Turntable 13: Telescopic boom 14: Operator's cab 15: Eye point 20: Auxiliary jib apparatus 21: Jib 22: Tension rod 23: Bifurcated base end part 24: Tip box structure 26: Left and right engaging portions 36 at the lower end of the telescopic boom tip: jib side tension rod connecting portion 37: tension rod connecting portion 39 at the time of retracting upper end of the telescopic boom tip connecting portion 40: floor iron plate

Claims (1)

A swivel base is pivotably mounted on the vehicle unit, and an extendable boom is pivotally attached to the swivel base, and a driver's cab for both vehicle running and crane operation is placed on the swivel base, located on the side of the telescopic boom. And an auxiliary jib device for a wheel crane that stores the telescopic boom so as to be positioned below the eye point of the cab when traveling,
A jib having a bifurcated base end portion that is substantially Y-shaped as a whole and that can be engaged with engagement portions on the left and right of the lower end of the telescopic boom tip;
In a state where the jib is extended to the distal end of the telescopic boom, a pair of the distal end portion is coupled to a jib side tension rod coupling portion provided on the upper surface of the jib distal end portion, and the base end portion is coupled to the coupling portions on the upper and lower sides of the telescopic boom distal end The tension rod of
A tension rod connecting portion at the time of storage that is disposed on one side of the bifurcated base end portion of the jib on the same side of the jib as the jib side tension rod connecting portion,
When storing the jib in the telescopic boom,
The jib has its base end facing the distal end of the telescopic boom on the lower surface of the telescopic boom, its front end facing the base end of the telescopic boom, and the jib-side tension rod connecting portion and the retracting tension rod connecting portion facing downward. Stored in posture,
A pair of tension rods are positioned below the jib by connecting the base end portion of the tension rod to the tension rod connecting portion during storage while the distal end portion of the tension rod is connected to the jib side tension rod connecting portion. An auxiliary jib device for a wheel crane, wherein the auxiliary crane is stored side by side.

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