JP2009286612A - Telescopic boom of crane and auxiliary jib - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic boom capable of quickly responding to even a demand of any specification by easily changing a standard specification and an auxiliary jib specification. <P>SOLUTION: This telescopic boom 1 is provided for installing a bracket 10 and a searcher hook (the auxiliary jib) 20 by using a space between a pair of mutual pulleys 4 installed on its tip boom 2. This bracket 10 has an insertion opening 12 capable of inserting a base end 24 of the searcher hook 20, and an angle fixing hole 14 for fixing an angle of the searcher hook 20. On the other hand, the auxiliary jib 20 is held at a predetermined angle by an angle fixing pin 16 inserted into the angle fixing hole 14 of the bracket 10 when its base end 24 is inserted from the insertion opening 12 of the bracket 10, and is rotatably supported by being pivoted by a pin member 6. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a telescopic boom and an auxiliary jib of a crane, and more particularly, to a mounting structure for an auxiliary jib mounted on a tip boom of a telescopic boom.

This type of auxiliary jib is usually set as an option for vehicle-mounted cranes and small crawler cranes with a lifting load of 2.9 t or less. It is to be installed with modifications to the specifications. Here, a bracket for mounting this type of auxiliary jib is known to be welded directly to the tip of a standard extension boom or fixed via a welded support ( For example, see Patent Document 1).
JP-A-1-231797

However, once the auxiliary jib bracket is welded as an extension boom for the auxiliary jib specification, it is difficult to remove it, and if there are multiple types of extension booms, there are user requests for each type. Accordingly, it is necessary to weld the brackets individually or stock the telescopic boom provided with the brackets separately from the normal ones. In addition, when stocked, it can respond to any demand promptly, but there is a problem that a large space is required for stock storage and management costs increase.
Therefore, the present invention has been made paying attention to such problems, and facilitates the installation and replacement of the auxiliary jib specification, so that the standard specification and the auxiliary jib specification can be easily changed from one to the other. The purpose of the present invention is to provide a telescopic boom for a crane and an auxiliary jib used for the crane that can respond quickly to any demand by stocking one of them.

  In order to solve the above-mentioned problems, a first invention of the present invention is a telescopic boom of a crane in which an auxiliary jib can be attached to its own tip boom, and is provided to extend to the left and right of the tip boom and downward. A pair of left and right side plates, a pair of pulleys provided at left and right inner ends of the pair of side plates, a space member disposed inside the pair of pulleys, and the pair of pulleys and the space member. A pin member inserted from the outside of the side plate; and a bracket provided so as to be positioned in the space member, the bracket including an insertion opening for inserting a base end portion of the auxiliary jib, and the auxiliary jib And an angle fixing hole for fixing the angle of the auxiliary jib inserted through the insertion opening and pivotally supported by the pin member. In cooperation with the fixed angle pins to be inserted into Teiana it is characterized by being adapted to hold the auxiliary jib at a predetermined angle.

  According to the telescopic boom of the crane according to the first invention, a pair of left and right side plates provided on the left and right sides of the tip boom, and a pair of pulleys provided on the left and right inner end portions of the pair of side plates, A space member disposed inside the pair of pulleys, a pin member inserted into the pair of pulleys and the space member from the outside of the pair of side plates, and a bracket provided to be positioned in the space member. The bracket further includes an insertion opening through which the base end of the auxiliary jib can be inserted, and an angle fixing hole for fixing the angle of the auxiliary jib, and is inserted through the insertion opening. A base end portion of the auxiliary jib pivotally supported by the pin member is rotatably supported, and the auxiliary jib is held at a predetermined angle by cooperation with an angle fixing pin inserted into the angle fixing hole. Since the turned so that can utilize the space between the pair of pulleys between which is mounted on the top boom, mounting the auxiliary jib. Accordingly, the bracket can be provided without individually welding the auxiliary jib bracket to the tip boom, and the auxiliary jib can be attached by this bracket. Therefore, it is easy to attach or replace the auxiliary jib or the auxiliary jib and the bracket. Therefore, the standard specification and the auxiliary jib specification can be easily changed from any one to the other, and any demand can be quickly met by simply stocking one.

  Moreover, 2nd invention among this invention is an auxiliary | assistant jib mounted | worn with the front-end | tip boom of the telescopic boom of a crane, Comprising: The said auxiliary | assistant jib is mounted | worn with the telescopic boom of the crane of Claim 1. And the base end portion of the auxiliary jib is rotatably supported by being inserted through the insertion opening of the bracket and pivotally supported by the pin member, and the angle fixing hole of the bracket It is characterized in that it is held at a predetermined angle by an angle fixing pin inserted through the.

  According to the auxiliary jib according to the second invention, the auxiliary jib is attached to the telescopic boom of the crane according to the first invention, and its base end is inserted from the insertion opening of the bracket and the pin member. Since the intermediate part of the auxiliary jib is held at a predetermined angle by an angle fixing pin inserted through the angle fixing hole of the bracket. It can be easily attached to and detached from the tip boom provided with a bracket that does not require individual welding. Therefore, it is easy to attach and replace the auxiliary jib.

  As described above, according to the telescopic boom of the crane and the auxiliary jib attached to the crane according to the present invention, the auxiliary jib can be easily attached and replaced, and the standard specification and the auxiliary jib specification can be changed from either one to the other. It is possible to change easily, and it is possible to respond quickly to demands of any specification by simply stocking one of them.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In addition, this embodiment is an example of the searcher hook which is an auxiliary jib used for cranes, such as a small crawler crane. Here, FIG. 1 is a diagram for explaining the telescopic boom according to the present invention and the auxiliary jib attached thereto, and FIG. 1 is a side view of the main part of the tip boom with the auxiliary jib attached. FIG. 2 is a cross-sectional view taken along line AA in FIG. Since this small crawler crane and its telescopic boom itself are the same as the well-known configuration except for the configuration of the tip boom portion described below, the description and illustration thereof are omitted.

  As shown in FIG. 1 or FIG. 2, the telescopic boom 1 of this small crawler crane is provided with the left and right side plates 3 of the tip boom 2 extending downward. A pair of pulleys 4 are provided at the left and right end portions inside the pair of left and right side plates 3, and a space member 5 is disposed inside the pair of pulleys 4 (see FIG. 2). A pin member 6 is inserted into the pair of pulleys 4 and the space member 5 from the outside of the pair of left and right side plates 3. In addition, the pair of pulleys 4 is rotatably supported with respect to the pin member 6 via a bearing (not shown). Further, a plate 8 is fixed horizontally between the left and right side plates 3 slightly above the pair of pulleys 4, and the upper portion of the space member 5 is in contact with the plate 8 so as not to rotate. ing. The bracket 10 for mounting the searcher hook 20 is inserted using a space between the pair of pulleys 4 so as to be positioned in the space member 5.

  Specifically, the bracket 10 has a substantially box shape, and has a curved guide portion 19 on the outer surface facing the proximal end side (left side in FIG. 1) of the telescopic boom 1. The guide portion 19 is a guide surface that guides the hook to the horizontal storage position when a hook (not shown) of the telescopic boom 1 itself is wound up with a known hook storage mechanism. That is, the bracket 10 also serves as a storage bracket for storing the hook, and can prevent the hook suspended from the tip of the tip boom 2 from swinging when the vehicle is traveling.

  Further, the bracket 10 has an insertion opening 12 for inserting the base end portion 24 of the searcher hook 20 on the outer surface (right side in FIG. 1) opposite to the guide portion 19. In addition, angle fixing holes 14 for fixing the angle of the searcher hook 20 are formed through the left and right side surfaces of the bracket 10 at a plurality of locations along the direction in which the pin member 6 is inserted. In the example of the present embodiment, the plurality of angle fixing holes 14 are equally distributed (θ = 20 °) at four locations (four sets on the left and right) along the circumferential direction around the pin member 6.

  The searcher hook 20 is formed with an insertion hole through which the pin member 6 can be inserted in the left and right at a base end portion 24 made of a rectangular pipe material. A through hole having the same diameter as that of the angle fixing hole 14 is provided at the position between the portion, that is, the base end portion 24 and the jib hook 22 on the distal end side, opposite to the plurality of angle fixing holes 14. It is provided to penetrate through. The bracket 10 is inserted through the angle fixing hole 14 while rotatably supporting the base end portion 24 of the searcher hook 20 inserted from the insertion opening 12 and pivotally supported by the pin member 6. The searcher hook 20 is held at a predetermined angle by cooperation with the angle fixing pin 16.

  The searcher hook 20 is different from a general auxiliary jib, and when the searcher hook 20 is not used, it can be used as a conventional wire-hanging crane. Moreover, when using this searcher hook 20, the light load thing, such as a glass plate, is conveyed to a high lift using the sucker attachment, for example using the jib hook 22 attached directly to the front-end | tip. It is possible to shift to such work.

Next, functions and effects of the telescopic boom 1 and the searcher hook 20 attached thereto will be described.
Since the telescopic boom 1 is configured such that the bracket 10 and the searcher hook 20 are detachable using the space between the pair of pulleys 4 attached to the tip boom 2, the pin member 6 is pulled out and the searcher hook is removed. 20, or by replacing the bracket 10 and the searcher hook 20, it is possible to easily change from one of the standard specification and the auxiliary jib specification to the other specification.

  That is, according to the telescopic boom 1, as described above, the pair of left and right side plates 3 provided on the left and right sides of the tip boom 2 and extending downward and the left and right inner ends of the pair of side plates 3 are provided. A pair of pulleys 4, a space member 5 disposed inside the pair of pulleys 4, a pair of pulleys 4 and a pin member 6 inserted into the space member 5 from the outside of the pair of side plates 3, and the space member 5 The bracket 10 is provided so as to be positioned at the position of the inserter. Further, the bracket 10 is used to fix the angle of the searcher hook 20 and the insertion opening 12 into which the proximal end portion 24 of the searcher hook 20 can be inserted. The angle fixing hole 16 is inserted into the insertion opening 12 and the base end 24 of the searcher hook 20 pivotally supported by the pin member 6 is rotatably supported. Since the searcher hook 20 is held at a predetermined angle by cooperating with the angle fixing pin 16 inserted through the fixing hole 14, a space between the pair of pulleys 4 attached to the tip boom 2 is provided. The bracket 10 for the searcher hook 20 can be detachably provided without using the bracket 10 for the searcher hook 20 separately. The searcher hook 20 can be detachably attached to the bracket 10. Therefore, the standard specification and the auxiliary jib specification can be easily changed from any one to the other, and any demand can be promptly met only by stocking one.

  Further, the searcher hook 20 can be attached and detached by simply pulling out the pin member 6, inserting and removing the base end portion 24 from the insertion opening 12 of the bracket 10, and inserting the pin member 6 again and assembling. Therefore, it is possible to quickly change the specification between the standard specification and the auxiliary jib specification. Accordingly, the searcher hook 20 can be easily attached and replaced. Further, the base end portion 24 of the searcher hook 20 also uses the pin member 6 that is a support shaft of the pair of pulleys 4 as a shaft for supporting the base end portion of the searcher hook 20, and the opening for inserting the bracket 10 is used. Since it is inserted from the part 12 and pivotally supported by being pivotally supported by the pin member 6, the number of parts can be reduced and a compact configuration can be achieved.

  The bracket 10 is provided with a plurality of angle fixing holes 14 (in this example, four locations) for fixing the angle of the searcher hook 20. The angle of the searcher hook 20 can be easily adjusted by inserting / removing the angle fixing pin 16. That is, as shown in FIGS. 3 to 6, as required, the first posture S1 (see FIG. 3), the second posture S2 (see FIG. 4), the third posture S3 (see FIG. 5), And the fourth posture S4 (see FIG. 6) can be appropriately set and used. In each figure, θ = 20 °, θ1 = θ (see FIG. 4), θ2 = 2θ = 40 ° (see FIG. 5), and θ3 = 3θ = 60 ° (see FIG. 6).

As described above, according to the telescopic boom 1 and the searcher hook 20 attached thereto, the searcher hook 20 or the searcher hook 20 and the bracket 10 can be easily attached and replaced. Can be easily changed from either one to the other, and it is possible to respond quickly to demands of any specification by simply stocking one.
The telescopic boom and auxiliary jib of the crane according to the present invention are not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the telescopic boom of a small crawler crane is taken as an example, but it is of course applicable to various telescopic booms of a crane, and a searcher hook is taken as an example. Needless to say, the auxiliary jib attached to the tip boom of the boom can be applied to various auxiliary jibs.
Further, for example, in the above-described embodiment, the example in which a plurality of angle fixing holes 14 for fixing the angle of the searcher hook 20 is provided has been described. However, the present invention is not limited to this. Set). However, it is preferable to provide a plurality of angle fixing holes 14 for fixing the angle of the searcher hook 20 in the bracket 10 in order to adjust the angle as necessary.

It is a figure explaining the expansion-contraction boom which concerns on this invention, and the auxiliary | assistant jib attached to this, The figure is a side view of the principal part of the front end boom of the state which mounted | wore with the auxiliary | assistant jib. It is AA sectional drawing in FIG. It is a figure explaining the state (1st attitude | position) by which the auxiliary | assistant jib which concerns on this invention is hold | maintained at a predetermined angle by the angle fixing pin inserted in the angle fixing hole of a bracket. It is a figure explaining the state (2nd attitude | position) by which the auxiliary | assistant jib which concerns on this invention is hold | maintained at a predetermined angle by the angle fixing pin penetrated by the angle fixing hole of a bracket. It is a figure explaining the state (3rd attitude | position) by which the auxiliary | assistant jib which concerns on this invention is hold | maintained at a predetermined angle by the angle fixing pin inserted in the angle fixing hole of a bracket. It is a figure explaining the state (4th attitude | position) by which the auxiliary | assistant jib which concerns on this invention is hold | maintained at a predetermined angle by the angle fixing pin inserted in the angle fixing hole of a bracket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telescopic boom 2 End boom 3 Side plate 4 Pulley 5 Space member 6 Pin member 8 Plate 10 Bracket 12 Insertion opening 14 Angle fixing hole 16 Angle fixing pin 19 Guide part 20 Searcher hook (auxiliary jib)
22 Jib hook 24 Base end of searcher hook

Claims (2)

A telescopic boom of a crane that can be fitted with an auxiliary jib on its own tip boom,
A pair of left and right side plates provided on the left and right of the tip boom and extending downward, a pair of pulleys provided at the left and right inner ends of the pair of side plates, and a space member disposed inside the pair of pulleys A pin member inserted into the pair of pulleys and the space member from the outside of the pair of side plates, and a bracket provided so as to be positioned in the space member,
The bracket has an insertion opening for inserting a base end portion of the auxiliary jib and an angle fixing hole for fixing an angle of the auxiliary jib, and is inserted from the insertion opening and pivoted by the pin member. The base end portion of the auxiliary jib to be supported is rotatably supported, and the auxiliary jib is held at a predetermined angle by cooperation with an angle fixing pin inserted through the angle fixing hole. A telescopic boom for cranes. An auxiliary jib attached to the tip boom of the telescopic boom of the crane,
The auxiliary jib is attached to the telescopic boom of the crane according to claim 1, and its base end is inserted from the insertion opening of the bracket and pivoted by the pin member. An auxiliary jib that is supported movably and is held at a predetermined angle by an angle fixing pin that is inserted into an angle fixing hole of the bracket while an intermediate portion of the auxiliary jib is inserted.

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