JPH0659381U - Crane boom - Google Patents

Abstract

(57) [Abstract] [Purpose] In a crane with a jib that adopts a hook hoisting and retracting system, prevents both the interference between the rope socket and the hook when the hook is retracted, and the interference between the rope end and the jib foot pin during crane work. To do. [Structure] A rope end fastening pin 13 to which the rope socket 12 is fastened is provided on a side surface of the boom head 2 at a position where the rope socket 12 and the hook do not interfere with each other in a retracted state of the hook, while a rope end portion of the jib foot pin 16 is provided. A rope guide frame 19 is provided on the side surface of the boom head so as to be guided to the rope end fastening pin 13 while being detoured to the outer peripheral side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boom of a crane having a jib capable of retracting and retracting a hook, and extending and retracting the hook.

[0002]

[Prior art]

 Conventionally, in wheel type cranes such as truck cranes and rough terrain cranes, as shown in FIGS. 4 and 5, a hook storage metal fitting 3 is attached to the tip portion (boom head) 2 of the boom 1, and a hook winding force line, That is, the left and right direction shifted to the front of the line X connecting the centers of the sheave pins 6 and 7 of the boom point main sheave 4 and the hook sheave 5 (the front when the boom 1 is laid down, the same in the following directions). It is mounted so that it can rotate around the horizontal axis 8, and when the crane is traveling, the hook 9 is rotated upward together with the storage metal fitting 3 in the unwound state so that the hook 9 is stored on the lower surface side of the boom in a state substantially parallel to the boom 1. Is publicly known (for example, see Japanese Patent Laid-Open No. 341496/1992).

In the figure, 10 is a boom point idler sheave provided above the boom head 2, 11 is a hoisting rope, and a rope socket 12 is attached to the end of the hoisting rope 11, and the rope socket 12 Is fastened to the rope end fastening pins 13 provided on the left and right side surfaces of the boom head 2.

In the boom 1 of the crane adopting such a so-called hook winding and retracting method, the rope end fastening pin 13 is attached to the boom end so that the rope socket 12 does not interfere with the hook 9 in the hook retracted state shown in FIG. It is provided at the front end of the head 2.

On the other hand, in many cases, the wheel type crane is provided with a jib 14 for increasing the lift as shown in FIGS.

The jib 14 is stored on the side surface of the boom 1 when not in use, and when used, a bifurcated jib foot 15 provided at the base end thereof is horizontally projected on both left and right side surfaces of the boom head 2. The jib foot pin 16 is engaged with the jib foot pin 16, and the boom head 2 is extended while being connected by the pin 17.

The jib foot pins 16 are usually formed by extending both left and right sides of the boom point main sheave pin 6 to the outside of the boom head 2 as shown in FIG. In FIG. 6, reference numeral 18 denotes a suspension rod that supports the jib 14 in an extended state.

[0008]

[Problems to be solved by the device]

 However, in such a crane with a jib, if the above-mentioned hook winding and retracting method is adopted, when the boom 1 is tilted to perform crane work as shown in FIG. 4, the end portion of the hoisting rope 11 (the rope socket 12 Alternatively, the rope itself) interferes with the jib foot pin 16 shown in FIGS.

Although this problem can be solved by providing the rope end fastening pin 13 at the rear end portion of the boom head 2, as described above, the rope socket 12 interferes with the hook 9 when the hook is stored. Becomes

In view of the above, the present invention provides a crane having a hook hoisting and storing system and a jib, which prevents interference between the rope socket and the hook in the hook hoisting and retracting state while the crane is working. It is intended to provide a boom that can prevent interference between the rope end portion and the jib foot pin.

[0011]

[Means for Solving the Problems]

 According to the first aspect of the present invention, the hook hung from the boom head by the hoisting rope is configured to be stored on the lower surface side of the boom in a substantially parallel state with the boom in the unwinding state, and on the side surface of the boom head. In a crane provided with a jib foot pin to which a base end of a jib is engaged and connected, and a rope end fastening part to which a rope socket attached to an end of the hoisting rope is fastened, the rope end fastening part is The rope socket is provided above the jib foot pin when the boom is lying down, and in a position where the rope socket does not interfere with the hook in the retracted state of the hook. A rope guide member is provided to guide the rope end fastening part by diverting to the outer peripheral side. It is.

According to a second aspect of the present invention, in the structure of the first aspect, the rope guide member is formed in an arc shape having a rope guide groove and is fixed to a side surface of the boom head.

[0013]

[Action]

 According to the above configuration, the rope end portion is always positioned on the outer peripheral side of the jib foot pin by the rope guide member while preventing the interference between the rope socket and the hook when the hook is stored. It is also possible to prevent interference between the rope end portion and the jib foot pin during work.

According to the second aspect of the invention, since the arc-shaped rope guide frame is used as the rope guide member, the cost is lower and the size is more compact than the case where a sheave is used, for example.

[0015]

【Example】

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

In this embodiment, the same parts as those of the prior art shown in FIGS. 4 to 7 are designated by the same reference numerals, and the duplicate description thereof will be omitted.

In the lower part of the side surface where the rope socket 12 of the boom head 2 is fixed, the front end of the boom head is located above the jib foot pin 16 as in the conventional case (the rope socket 12 interferes with the hook 9 in the hook retracted state). A rope end fixing pin 13 is provided at a position not provided), while an arcuate rope guide frame 19 is provided at a rear portion.

The rope guide frame 19 is formed in a substantially U-shaped (or L-shaped) cross section with a rope guide groove 19a over the entire length, and at the rear position of the jib foot pin 16 (the rear part of the boom head 2), the boom collapsed. In this state, one end faces downward and the other end faces forward (toward the rope end fastening pin 13), which is fixed to the boom head 2 by welding or the like.

At the end portion of the hoisting rope 11, the rope socket 12 is fixed to the rope end fastening pin 13 with the portion near the rope socket 12 fitted in the rope guide groove 19 a of the rope guide frame 19. .

As a result, the rope end portion including the rope socket 12 is always located on the outer peripheral side of the jib foot pin 16 and is kept apart from the jib foot pin 16 regardless of the boom angle.

Therefore, according to this configuration, the interference between the rope socket 12 and the hook 9 is prevented in the state where the hook is wound and stored as shown in FIG. 3, while the boom 1 is tilted as shown in FIGS. Even during the crane work, the interference between the rope end portion and the jib foot pin 16 is avoided.

By the way, as the rope guide member, a rotatable sheave may be used instead of the arc-shaped rope guide frame 19 described in the above embodiment.

In the above embodiment, the boom point main sheave pin 6 is extended to the outside of the boom head 2 to form the jib foot pin 16, but the jib foot pin 16 may be attached to the boom head 2 separately from the sheave pin 6.

Further, in the above-described embodiment, the hook 9 is wound and stored by using the hook storage metal fitting 3. However, the hook 1 is erected without using the hook storage metal fitting 3 as described above. A configuration may be adopted in which the boom 9 is wound and wound so as to be in contact with the boom head 2 in a state substantially parallel to the boom 1, and the boom 1 is tilted as it is to be in a hook retracted state.

[0025]

[Effect of device]

 As described above, according to the present invention, in the crane with jib that adopts the hook winding and storing method, the rope end fixing portion is provided at a position where the rope socket does not interfere with the hook in the retracted state of the hook, while the rope end is fixed. A rope guide member is provided on the side of the boom head that guides the rope end fixing part by diverting the part to the outer circumference of the jib foot pin. It is possible to reliably prevent both the interference between the rope end portion and the jib foot pin when the crane is operated at.

According to the second aspect of the invention, since the arc-shaped rope guide frame is used as the rope guide member, the cost is low and the size is compact as compared with the case of using a sheave, for example.

[Brief description of drawings]

FIG. 1 is a side view of a boom tip portion according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a view corresponding to FIG. 2 in a state where the hook is wound and stored from the state of FIGS.

FIG. 4 is a side view for explaining a conventional technique in a hook winding type crane.

5 is a view corresponding to FIG. 4 in a state where the hook is wound and stored from the state of FIG. 4.

FIG. 6 is a side view for explaining a conventional technique in a crane with a jib.

FIG. 7 is a view taken along line VII-VII in FIG.

[Explanation of symbols]

 1 boom 2 boom head 3 hook storage fitting 9 hook 11 hoisting rope 12 rope socket attached to rope end 13 rope end fastening pin (rope end fastening part) 16 jib foot pin 14 jib 15 jib foot (jib base end) 19 Rope guide frame (rope guide member) 19a Rope guide groove

Claims (2)

[Scope of utility model registration request] 1. A hook, which is hung from a boom head by a hoisting rope, is configured to be stored on a lower surface side of the boom in a wound state in a state substantially parallel to the boom, and
A crane in which a jib foot pin to which a base end portion of a jib is engaged and connected and a rope end fastening portion to which a rope socket attached to an end of the hoisting rope is fastened are provided on a side surface of the boom head, The fastening portion is provided above the jib foot pin in the boom laid state and at a position where the rope socket does not interfere with the hook in the retracted state of the boom, and on the side of the boom head, a rope terminal portion including the rope socket. A boom of a crane, characterized in that it is provided with a rope guide member that detours around the jib foot pin and guides it to the rope end fastening portion. 2. The boom of a crane according to claim 1, wherein the rope guide member is formed in an arc shape having a rope guide groove and is fixed to a side surface of the boom head.