JPH08295490A - Wiring structure of bridle and bail for jib crane - Google Patents

Abstract

PURPOSE: To shorten a luffing jib assembling time by a method wherein a seal block is transferred to a bracket arranged on a boom and a link arranged on the jib side and even in such a state that a luffing jib is not attached, wiring of a bridle and bail is practicable. CONSTITUTION: A sheave block (h) is removably mounted on a bracket 1 fixed on a boom (b). The bracket 1 is formed in such a manner that a base plate 4 is fixed to a stay 3 erected on a mounting plate 2 fixed to the boom (b) and a pin 6 is rotatably supported between support plates 5 and 5 erected on both sides of the base plate 4. A rise and fall rope (c) is arranged on the boom (b) between the sheave block (h) and a bail (g). Simultaneously, a jig is attached to the tip of the boom (b). The pin 6 in the sheave block (h) is pulled out. After the sheave block (h) is suspended by an auxiliary crane, it is matched with unwinding of the rise and fall rope, and the sheave block (h) is pivotally supported and coupled to the tip of a link on the jib side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridle-bail wiring structure for a jib crane.

[0002]

2. Description of the Related Art A description will be given with reference to FIG. In the conventional jib crane, in the bridle bail wiring method, the roughing jib a is first attached to the tip of the boom b. Next, the elevation rope c is hung around the sheave e provided at the tip of the rear post d, and the wiring between the bridle f and the bail g is carried out by the laid elevation rope c. With this structure, the lifting rope c is hung on the sheave e at the tip of the rear post, so that the roughing jib a is first pushed.
It was impossible unless it was attached to the frame b.

[0003]

There is a wiring work of the bridle f and the bail g in the procedure for assembling the roughing jib a. As mentioned above, the wiring work is performed after the roughing jib a is attached to the boom b. Otherwise you can't. For this reason, there is a problem that the wiring work is performed after the roughing jib a is attached and the assembling time becomes long. An object of the present invention is to enable bridle bail wiring work even when the roughing jib a is not attached to the boom b, shorten the assembling time of the roughing jib a, and improve workability.

[0004]

[Means for Solving the Problems] In the jib crane,
A sheave block h can be attached to and detached from a bracket 1 provided on a boom b via a pin 6, while a link 11 is provided on a rear post d, and a pin 12 is provided at the tip of the link 11 to form the sheave.
The block h can be attached and detached, and the wiring work of the elevation rope c can be performed without the roughing jib a.

[0005]

Function: The elevation loop c is wired between the sheave block h and the bail g on the boom. At the same time, jib a
Attach it to the tip of the hole b. The pin 6 of the sheave block h is pulled out, and the sheave block h is lifted by the auxiliary crane. After that, the sheave block h was moved to the link 11 in accordance with the unwinding of the elevation rope c, and the sheave block h was connected to the tip of the link 11 by the pin 12.

[0006]

Embodiments will be described with reference to FIGS. In FIG. 2, h is a boom b
It is a sheave block provided above. The sheave block h is detachably attached to the bracket 1 fixed on the boom b. The bracket 1 includes a mounting plate 2 fixed to a boom b, a support 3 standing upright on the mounting plate 2, a substrate 4 fixed on the support 3, and support plates 5 standing upright on both sides of the substrate 4. 5 is pivotally supported by a pin 6.

The sheave block h has a hollow shaft 7 into which the pin 6 is inserted, and two side plates 8 and 8 fixed to both ends thereof.
The shaft 9 and the sheave 10 are supported by the two side plates 8 and 8. Reference numeral 11 denotes a link provided on the rear post d, and a sheave block h is detachably attached to the tip of the link by a pin 12.

(Wiring Method) (1) The elevation loop c between the sheave block h and the bail g.
Wire (Fig. 2). (2) At the same time as wiring, the jib a is attached to the tip of the boom b. (3) Pull out the pin 6 (FIG. 2B) of the sheave block h.
The sheave block h is lifted by the auxiliary crane 13. (4) The sheave block h is moved to the link 11 in accordance with the unwinding of the elevation loop c (see the alternate long and short dash line in FIG. 3A). (5) Attach the sheave block h to the tip of the link 11 with the pin 12
Connect with.

[0009]

[Effect] The sheave block h is transferred to the bracket 1 provided on the boom b and the link 11 provided on the jib a side,
The bridle bail can be wired even without the roughing jib a. Since this is done, the assembly time of the roughing jib a can be shortened and the workability is further improved.

[Brief description of drawings]

FIG. 1 illustrates a known jib crane bridle bail wiring method.

FIG. 2 is a sheave block detachable from a boom in the wiring structure of the present invention.

FIG. 3 is an explanatory diagram of a wiring method using the present invention.

[Explanation of symbols]

 a roughing jib b boom c elevation rope d rear post e sheave f bridle g bail h sheave block 1 bracket 2 mounting plate 3 support 4 substrate 5 support plate 6 pin 7 hollow shaft 8 side plate 9 shaft 10 sheave 11 Link 12 pin 13 Auxiliary crane

Claims (1)

[Claims] 1. A jib crane in which a sheave block is mounted on a bracket (1) provided on a boom (b) through a pin (6).
(h) can be attached and detached, and on the other hand, one end of the rear post (d) has a seal.
A link (11) for connecting the block block (h) is provided, and the link
The sheave block (h) can be attached to and detached from the tip of (11) with a pin (12), and wiring work to the bridle bail of the elevation rope (c) can be performed without the roughing jib (a). Bridle bail wiring structure in the characteristic jib crane.