JPS6138019A - Catch fork for pile driver - Google Patents

Abstract

PURPOSE:To make the attaching and detaching operations of a catch fork easier by a method in which an inner cylinder is fitted into an outer cylinder to make them expandible forwards, and the outer cylinder is provided with a lateral shaft, a rotator, an intermediate metal, and a leader-fixing ring in order. CONSTITUTION:A catch fork can be vertically turned through a lateral shaft 1 in relation to a crane. A leader-fixing ring 9 connected to a leader can be turned bilaterally and horizontally through a horizontal shaft 8, a lateral shaft 6, and a vertical shaft 4 in relation to the inner cylinder 3 and also can be tilted back and forth on the shafts. The catch fork is attached to the leader, the rotator 5 is swung bilaterally through an oil-pressure cylinder 12, and the inner and outer cylinders are extended or contracted by the oil-pressure cylinder 10 to correct the attitude of the leader to a given state. The attaching of the catch fork to the leader can thus be effectively made without affected by the rotation of the leader due to positional movement.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catch hawk for a pile driver.

As shown in Fig. 5 (A), the pile driving machine has a leader d suspended from the tip of the boom b of a mobile crane a via a connector C, and its lower end is vertically connected to the crane via a catch hawk e. After fixing to the leader, a hammer or an earth-shape is attached to the leader to drive the stake. Conventionally, the catch hawk is simply formed as a turnbuckle-like telescoping rod. Because of this, there was a disadvantage that fixing the leader was time-consuming compared to a tilting leader.

In contrast, the catch hawk of this invention allows the leader fixing ring, which is the fixed part with the leader, to extend and contract back and forth, as well as swing up and down and tilt left and right with respect to the horizontal mounting shaft, which is the part to which the crane is attached. This structure makes it extremely easy to attach and detach the Yatchhawk to the suspended leader, as well as to make vertical adjustments.

An embodiment of the catch hawk of the present invention will be explained with reference to the drawings. Figs. 1 and 2 are a plan view and a side view in an extended state, respectively, and Fig. 3 is a plan view in a contracted state. The inner cylinder 3 is fitted to the other end of the outer cylinder 2 which has a horizontal shaft 1 for attachment to a crane to form a telescoping cylinder, and the tip of the inner cylinder 3 has a vertical shaft 4 that allows it to rotate horizontally. 5 is provided, and an intermediate metal fitting 7 is provided on this rotating shaft 5 via a horizontal axis 6 in the left-right direction, and a leader fixing ring 9 having a horizontal axis 8 in the front-rear direction is fitted into this intermediate metal fitting 7. ing. Also, inside the inner cylinder 3 is a telescopic hydraulic cylinder 10 whose one end is pivoted to the base end of the outer cylinder 2 and the other end is connected to the tip of the inner cylinder 3. Hydraulic cylinders 12 for the movement of soldiers are provided, the other end of which is connected to an arm 11 connected to the rotation tool 5. An inner ring 13 is rotatably fitted on the inner circumferential surface of the leader fixing ring 9 along the outer circumference of the fixing ring.

With the above-described configuration, the catch hoter itself is vertically rotatable with respect to the crane via the horizontal shaft 1, as shown in FIG. 2, and the leader fixing ring 9 connected to the leader Since it is free to horizontally turn horizontally in the left-right direction and tilt with respect to the inner cylinder 3 via the horizontal shaft 6 and the vertical shaft 4, and to tilt around the front-back direction, it is extremely easy to attach it to the leader. In other words, when the leader is suspended, the lower end of the leader faces backwards, as shown in Figure 5 (C), due to the center of gravity, and it is tilted to the left and right when viewed from the front, as shown in Figure 5 (B). It is not easy to engage the fixing ring of the catch hawk with this leader with the conventional one, but in this invention, the leader fixing ring 9 can be moved and tilted freely according to the leader, and It is extremely easy to use because the catch hawk itself can be tilted up and down. After fitting to the leader, the rotating tool 5 is swung left and right via the hydraulic cylinder 12 as shown in FIGS. 4(A) and 4(B).
Next, the inner and outer cylinders can be expanded and contracted by the hydraulic cylinder 10 to correct the leader to a predetermined state. In this case, since the inner ring 13 of the leader fixing ring fitted to the leader is separately rotatable, efficiency is achieved without being affected by rotation of the leader caused by positional movement.

As described above, the present invention can be used in combination with the traveling movement of the turntable of a mobile crane to easily fix the position of the leader, and is particularly suitable for vertical poling on a slope.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the catch hawk of the present invention, FIG. 1 is a plan view when extended, FIG. 2 is a side view of the same,
Fig. 3 is a plan view when it is shortened, Figs. 4 (A) and (B) are plan views showing the horizontal rotation state of the rotating tool, and Fig. 5 (A).
, (B), and (C) are a side view with the reader suspended in a predetermined state, a front view before correction to the predetermined state, and a side view of the same. 1...Horizontal shaft for mounting 2...Outer tube 3...Inner tube 4...Vertical axis...Rotation 6...Horizontal shaft 7...Intermediate metal fitting 8...Horizontal shaft 9 ... Fixed ring 10.12 ... Hydraulic cylinder 11 ... Arm 13 ... Inner ring

Claims (1)

[Claims] The inner cylinder is fitted into the outer cylinder so that it can expand and contract forward, and a horizontal shaft for mounting on a crane is attached to the base end of the outer cylinder, and a rotating tool is attached to the tip of the inner cylinder via a vertical shaft. An intermediate metal fitting is attached to this rotating tool via the horizontal axis in the left and right direction, and a leader fixing ring, in which the inner ring is rotatably fitted on the circumferential surface of the intermediate metal fitting, is inserted into the intermediate metal fitting, and a horizontal shaft protruding from the rear end of the circumferential surface is inserted into the intermediate metal fitting. A catch hawk for a pile driving machine, in which the inner cylinder is equipped with a hydraulic cylinder for rotating the rotating tool, and the outer cylinder is equipped with a hydraulic cylinder for expansion and contraction.