JPH06171896A - Suspending gondola for crane - Google Patents

Abstract

PURPOSE:To vertically suspend a gondola regardless of expansion/contraction or derricking of a boom, and reduce its fluctuation. CONSTITUTION:A fitting arm 2 having yoke shaped extreme ends is engaged with a gondola main body 1 at the positions A, A' on both side of the upper part of the gondola main body 1, so as to sandwich the gondola main body rotationally movably, and shock absorbers 3, 3' are fitted between positions B, B which are on the root side of the fitting arm 2 than the positions A, A' and on the yoked parts, and positions C, C' which are positioned below the positions A, A' on both sides of the gondola main body 1, so as to be rotationally movable on both end parts. When the gondola main body 1 is fitted rotationally movably outside upward centering around the positions A, A', a crane can be traveled while having the gondola mounted thereon and by forming the front face side of the gondola main body 1 into a part of an ellipse, it can be turningly moved in a narrow space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanging gondola for a crane, which is mainly mounted on a boom or jib of a mobile crane for use. In the present invention, the term "boom" will be used hereinafter in a broad sense including jib.

[0002]

2. Description of the Related Art Recently, cranes including mobile cranes have become larger and booms have become longer. For this reason,
Although it has not been so much in the past, there has been an increasing demand for hanging the gondola on a crane for use. For safety and workability, this crane suspension gondola is always hung vertically regardless of boom extension / contraction and undulation, as well as boom swing / extension / removal and movement of workers in the gondola. Shaking due to wind pressure etc. should be minimal. Therefore, when using this type of gondola, engage the gondola with the boom tip and hang it, and further attach a spindle between the gondola body and the boom tip or a gondola attachment arm fixed to the boom. Workers were adjusting the posture of the gondola body and performing shaking prevention operations by pulling wires.

[0003]

However, in the conventional gondola, it is necessary for an operator to adjust the position of the gondola during crane work or other work, and there is a problem that the prevention of shaking is not sufficient. there were. In addition to this, there was the inconvenience that the gondola had to be removed from the boom when traveling and moving the crane. The present inventors have completed the present invention through research and trial and error in order to solve this problem and provide a safe and easy-to-use crane hanging gondola.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a gondola to be mounted on the tip of a crane, which has bifurcated mounting arms for suspending a gondola at positions A and A'on both sides of the upper part of the gondola body 1. 2 are rotatably engaged with the gondola by sandwiching the gondola main body 1, and positions B and B ′ that are on the base side of the mounting arm 2 with respect to the engagement positions A and A ′ and are at the bifurcated portion. Below the engagement positions A and A ′ when the main body 1 is suspended,
Also, a suspension gondola for a crane, characterized in that shock absorbers 3 and 3'are rotatably attached at both ends between positions C and C'on both sides of the gondola body 1, respectively. provide. This crane suspension gondola can be mounted on one or both of the shock absorbers 3 and 3 ′ by removing the shock absorbers 3 and 3 ′.
It is preferable that the gondola body is attached to the tip of the crane so that the gondola body is rotatable upward and outward about the positions A and A ′. Furthermore, the gondola body 1
It is preferable that the front surface side in the horizontal cross section is formed by a part of an ellipse.

[0005]

OPERATIONS AND EXAMPLES The hanging gondolas for cranes of the present invention will be described in detail with reference to the drawings showing examples. FIG. 1 is a side view of an embodiment of a hanging gondola for a crane according to the present invention, and FIG. 2 is a plan view thereof. In the crane suspension gondola of the present invention, in order to stably and vertically suspend the gondola main body 1, a bifurcated mounting arm 2 is used, and the upper part of the gondola main body 1 is sandwiched by the bifurcated portion, and , The mounting arm 2 is rotatably engaged with the gondola body 1 at positions A and A ′ on both side surfaces thereof. The base side of the mounting arm 2 is attached to the tip of the boom 4 of the crane. At this time, if the mounting arm 2 is attached to the sheave (wire groove wheel) pin of the auxiliary winding 5, the sheave rotation and the wire replenishment will not be hindered, and the original work of the crane can be performed even when the gondola is attached. Even if the sheave pins have different shapes, they can be attached to both ends. A and A'are placed at symmetrical positions on both sides of the gondola body 1. Depending on the type of work and weather conditions, it may be desirable to fix the gondola body 1 to the beam 4 during work. Therefore, the engagement clutch with an operating handle is used to engage the gondola body 1 with the mounting arm 2. Then, the gondola body 1 can be fixed to the beam 4 when necessary, which is convenient and preferable.

Further, symmetrical positions B and B'from the root which are at the bifurcated portion of the arm 2 with respect to the engagement points A and A '.
And the engagement points A and A with the gondola body 1 suspended.
Shock absorbers 3 (also referred to as dampers) and 3'are mounted between C and C ', which are located below ′ and at symmetrical positions on both sides of the gondola, respectively. The shock absorbers 3 and 3'are rotatably attached at their respective attachment positions. Therefore, when suspended, AB
C and A'B'C 'form a triangle whose shape is
It changes with the ups and downs of the boom. The shock absorber 3 expands and contracts due to the expansion and contraction and ups and downs of the boom, or the wind pressure, and has the action of preventing the gondola main body 1 from shaking while keeping the posture of the gondola main body 1 vertical.

The type of shock absorber 3 used in the present invention is not particularly limited, but among them, there are an oil shock absorber utilizing the fluid resistance of oil, an air shock absorber utilizing the fluid resistance of air flowing through the throttle portion, and the like. It can be preferably used. The preferred shock absorber 3 is that the gondola body 1 is always hung vertically toward the ground, that the gondola body 1 does not swing at the start and end of the ups and downs of the boom 4, and the shock absorber 3 is synchronized with the ups and downs of the boom 4. Select based on the fact that the gondola body 1 does not shake during operation of the gondola. An appropriate one must be selected according to the crane manufacturer and model, and the performance and mounting position of the shock absorber used. As a very general guide, it is advisable to use a shock absorber with a pushing and pulling pressure in the range of 15 to 120 kg. For example, generally, when the total weight of the gondola body is about 100 kg, the total weight of the push-pull pressure is 20 to 25 kg and the total weight is 250 kg.
At about kg, a shock absorber with a push-pull pressure of 25 to 60 kg is suitable. If the pushing and pulling pressure of the shock absorbers 3 and 3'is too large, the vertical posture of the gondola body 1 cannot be maintained, and if it is too small, it does not help to prevent shaking. The length of the shock absorbers 3 and 3'is
The minimum length is shorter than the distance between B and C when the boom 4 is at the maximum hoisting angle, and the maximum length is B and C when the boom 4 is at the minimum hoisting angle.
Use one that is longer than the distance from.

Further, by removing the attachment of the shock absorbers 3 and 3'at one or both of the attachment positions of the shock absorbers 3 and 3 ', the gondola main body 1 is kept at the position A while the gondola is attached to the tip of the crane. It is convenient to mount it so as to be able to rotate outward and upward around A and A ', because the gondola main body 1 can be moved on a general road without being removed. FIG. 3 is a side view showing the traveling state, and 8 is a carrier portion for traveling. Further, it is preferable that the front side 7 in the horizontal cross section of the gondola main body 1 is formed of a part of an ellipse because the gondola main body 1 can be smoothly swung in a narrow space. Here, the front surface side 7 refers to the surface opposite to the mounting side to the beam.

[0009]

The crane to which the hanging gondola for a crane of the present invention can be mounted is not particularly limited, but in particular, a truck crane, a wheel crane, a rough terrain crane,
Highly useful in mobile cranes such as crawler cranes. The gondola of the present invention, by using an appropriate shock absorber, the gondola body is automatically kept in a vertical position without being shaken by boom expansion / contraction, ups and downs, wind pressure, etc. Is. In other words, there is almost no need for the operator to perform some extra operation for adjusting the attitude of the gondola during operation. Moreover, its structure is simple, it can be easily attached to the boom, and it does not hinder the operation of the auxiliary winding and the main winding. Also, since the gondola can be mounted on the tip of the crane to travel on a general road, the use efficiency of the crane can be improved and labor can be saved. Furthermore, if the front side of the gondola body is formed as a part of an ellipse, the gondola body can be swung smoothly in a narrow space.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a hanging gondola for a crane according to the present invention.

FIG. 2 is a plan view of an embodiment of a hanging gondola for a crane according to the present invention.

FIG. 3 is a side view showing a state in which the gondola of the present invention is mounted for traveling.

[Explanation of symbols]

1: Gondola body 2: Mounting arm 3: Shock absorber 4: Boom 5: Auxiliary winding mounting part
6: Main winding mounting part 7: Front surface 8: Carrier part

Claims (3)

[Claims] 1. A gondola which is attached to a tip of a crane and is hung, wherein a mounting arm 2 for hanging a gondola having a bifurcated tip is provided at positions A and A'on both sides of an upper part of the gondola body 1. And is rotatably engaged with the gondola, and the gondola main body 1 is suspended from the engaging positions A and A ′, which are on the base side of the mounting arm 2 and at the forked portions, and the positions B and B ′. The shock absorbers 3 and 3'rotate at both ends between the engagement positions A and A ', and the positions C and C'on both sides of the gondola body 1 in the closed state. A hanging gondola for a crane, characterized by being mounted so that it is possible. 2. At one or both of the mounting positions of the shock absorbers 3 and 3 ', the mounting of the shock absorbers 3 and 3'is released so that the gondola body is kept at the position A and the position of the gondola while being attached to the tip of the crane. The hanging gondola for a crane according to claim 1, wherein the hanging gondola is attached so as to be rotatable upward and outward about A '. 3. The hanging gondola for a crane according to claim 1, wherein the front side of the gondola body 1 in a horizontal cross section is formed by a part of an ellipse.