JP2000357019A - Control lever structure for foldable crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control lever structure for foldable crane with which housing is facilitated, a structure is simplified and space saving can be made compatible with the degree of freedom in layout. SOLUTION: The main body of lever is divided into two round rods 7 of the same diameter, a slit-shaped recessed part 14 is formed at the lower end of the upper round rod 7 and a planar projecting part 15 to be fitted there is formed at the upper end of the lower round rod so that both the parts can be slid and engaged. Then, a lengthy oblong hole 16 is formed in the axial direction of the projecting part 15 and a pin 17 through the recessed part 14 of the upper round rod 7 is passed through the oblong hole 16 so that both the round rods 7 can not be separated. A cylindrical body 9 fitted outside the engaged recessed part 14 and projecting part 15 at the time of drawing and both the round rods 7 are fixed. At the time of housing, by pulling up the upper round rod 7, the recessed part 14 and the projecting part 15 are disengaged and at the upper end of the oblong hole 16, the upper round rod 7 is bent down with the pin 17 as an axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a control lever provided on a crane operating section of a folding crane used in, for example, forestry.

[0002]

2. Description of the Related Art In the case of a folding crane used in forestry and the like mounted on a truck or the like and loading long timber or the like on a truck bed, it is more efficient to have a bird's-eye view of the whole, so work efficiency is better. An operation unit for operation is provided above a column supporting the boom.
On the other hand, if the crane operation unit is kept high, there is a possibility that the crane operating unit may interfere with, for example, trees when the folding crane is mounted on a truck and travels. Therefore, it is possible to store the operator's seat and the control lever for operating the crane provided in the crane operation part,
The overall height can be reduced.

Among the storage methods of the control lever, as shown in FIG. 6, for example, as shown in FIG. 6, the lever main body A is detachable, and when the control lever is stored, the removed lever main body A is stored in a lower part. As shown in FIG. 7, there is a type in which the lever main body A can be moved up and down, and when stored, the lever main body A is pushed downward.

[0004]

However, among the control levers of the conventional folding crane,
In the apparatus shown in FIG. 6, for example, a mechanism for storing the removed lever body A when traveling while mounted on a truck bed, for example, a pipe for inserting the lever body A as shown in FIG. B and the like must be provided in the vicinity. Further, in the configuration shown in FIG. 7, a storage space for the pushed-in lever body A must be provided below the control lever, and the layout is restricted accordingly, and the operation unit cannot be designed to be compact. is there. Further, as shown in FIG. 7, a detent mechanism C composed of a ball plunger or the like is required, which complicates the structure. For example, lubrication is required so that the detent mechanism C does not rust.

The present invention has been developed in view of these problems, and is a control lever of a folding crane which can be easily stored, has a simple structure, and saves space and freedom of layout. It is intended to provide a structure.

[0006]

In order to achieve the above object, a control lever structure of a folding crane according to the first aspect of the present invention provides a control mechanism provided on an operation section of a folding crane capable of bending a boom. A lever structure, wherein at one end of each of two rods constituting a lever body, a sliding engagement portion slidable and engageable with each other is formed, and either one of the rods is formed. A long hole is formed in the sliding engagement part of the two rods in the sliding direction of the two rods, and a pin attached to the sliding engagement of the other rod is penetrated through the long hole, and the two rods are When the sliding engagement portions are not engaged with each other, the two rods are rotatable around the pins.

According to a second aspect of the present invention, there is provided a control lever structure for a folding crane according to the first aspect of the present invention, wherein the sliding engagement portion is any one of the two bars. It is characterized by comprising a concave portion provided at an end of one of the bars and a convex portion provided at an end of the other bar and capable of being fitted into the concave portion. .

According to a third aspect of the present invention, in the control lever structure for a folding crane according to the first or second aspect, the sliding engagement portions of the two bars are engaged with each other. In this case, a stator for fixing the both rod members is attached to the outside of the fixing member.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of a folding crane 1 employing the control lever structure of the present invention. The folding crane 1 is mounted on a truck or the like and is used for forestry and the like. As shown, the boom 3 pivotally supported by the column 2 is bendable. Further, the crane operation unit 4 is provided on the upper part of the column 2 so that the work state can be overlooked. The crane operating section 4 is provided with an operator's seat 5 and a control lever.

FIG. 2 shows the details of the control lever provided on the crane operating section 4. The lever main body 6 constituting the shaft portion of the control lever is formed by joining two round bars 7 and 8 having the same diameter. In FIG. Divided by The upper round bar 7 is straight, and a ball knob 10 serving as a handle is attached to the upper end thereof.

On the other hand, the lower round bar member 8 is formed by bending the upper part of the figure obliquely with respect to the lower part of the figure vertically, and the lower end thereof is connected to the switching bracket 12 via the lock nut 11. The switching bracket 12 is connected to a control valve (not shown) for operating the crane. When the lock nut 11 is loosened, the direction of the lower round bar 8 with respect to the switching bracket 12, that is, the direction of the lever body 6. Can be set freely. Also,
A leaf spring clamp 13 for clamping the upper round bar 7 by a spring force is attached to a vertically lower portion of the lower round bar 8.

The connection structure between the upper round bar 7 and the lower round bar 8 is as shown in FIG. Specifically, a slit-shaped recess 14 is formed at the lower end of the upper round bar 7, and a flat plate-shaped projection fitted into the slit-shaped recess 14 is formed at the upper end of the lower round bar 8. A part 15 is formed. Therefore, the concave portion 14 at the lower end of the upper round bar 7 and the convex portion 15 at the upper end of the lower round bar 8 are slidable and engageable with each other in the axial direction. It constitutes a sliding engagement part. Then, the convex portion 1 of the lower round bar 8
5 is formed with an elongated hole 16 along its axial direction, that is, along the sliding direction of the sliding engagement portions (the concave portion 14 and the convex portion 15) of the round bars 7 and 8. A pin 17 driven into the sliding engagement portion formed of the concave portion 14 of the upper round bar 7 penetrates the elongated hole 16. Therefore, both round bars 7,
8 are slid in the axial direction with respect to each other, the pin 1 attached to the sliding engagement portion (recess 14) of the upper round bar 7
7 is an elongated hole 1 of the sliding engagement portion (projection 15) of the lower round bar 8
Move in 6.

Further, in a state where the sliding engagement portions of the round bars 7 and 8 are engaged with each other, a stator made of a cylindrical body 9 is attached to the outside thereof, and the round bars 7 and 8 are fixed. 8 is fixed. Specifically, a cylindrical body 9 made of a collar having the same inner diameter as the outer diameter of the upper round bar 7 is fitted on the outer periphery of the upper round bar 7 and is driven into the lower round bar 8. The stopper pin 18 is fixed so as not to come down further.

Therefore, when the upper round bar 7 and the lower round bar 8 are engaged in series by the above-mentioned connecting structure, the pin 17 is at the lower end of the elongated hole 16 and in this state, the two round bars A stator consisting of a cylindrical body 9 is attached to the outer periphery of the sliding engagement portion (recess 14, projection 15) in which the bars 7, 8 are engaged, and both round bars 7, 8 are fixed. On the other hand, the lever body 6
Is stored, the stator consisting of the cylindrical body 9 is once lifted up, the entire upper round bar 7 is pulled up, and the pin 17 is positioned above the slot 16. In this state, the engagement of the sliding engagement portion composed of the concave portion 14 and the convex portion 15 of both round bars 7 and 8 is released.
In this embodiment, as shown in FIG. 4, the upper round bar 7 is rotated downward so that the two round bars 7 and 8 are bent from the connection portion. To Then, the stator composed of the cylindrical body 9 is
It automatically moves downward due to gravity and contacts the ball knob 10 and does not fall further downward. In the present embodiment, the suspended upper round bar 7 is pushed into the leaf spring clamp 13 and fixed.

FIG. 5A shows a state where the lever main body 6 is extended using the control lever structure, and FIG. 5B shows a state where the lever body 6 is retracted. As is clear from the figure, similarly to the stored operator seat 5, the control lever can be stored easily and at a low position. Also, there is no need for a separate mechanism or space for storing the lever body 6,
Excellent space saving and freedom of layout. In addition, the structure is simple and easy to put to practical use.

Incidentally, the convex portion 15 constituting the sliding engagement portion is provided.
The bar formed between the recess 14 and the recess 14 may be reversed, and the sliding engagement portion formed between the slot 16 and the pin 17 may be reversed. Also, the shape of the sliding engagement portion is not limited to the above, and any shape may be used as long as it is slidable in the axial direction with respect to each other and does not displace each other. .

[0017]

As is apparent from the above description, according to the control lever structure of the folding crane according to the first aspect of the present invention, each of the ends of the two bars constituting the lever body is provided. And a sliding engagement portion that is slidable and engageable with each other, and a long slot is formed in one of the sliding engagement portions of the bar in the sliding direction of the both bars. Then, a pin attached to the sliding engagement of the other rod is passed through the elongated hole, and when the sliding engagement portions of both rods are not engaged with each other, the two rods are pivoted about the pin. By being rotatable, the sliding engagement portions of the two bars are engaged with each other to form the lever body during use, and the sliding engagement portions of the two bars are released during storage. Since both can be folded and stored with the pin as the axis, storage is easy, space saving and layout flexibility. It is possible to achieve both.

Further, according to the control lever structure of the folding crane according to the second aspect of the present invention, a concave portion provided at one end of one of the bars and an end of the other bar are provided. By providing the sliding engagement portion with the provided and convex portion that can be fitted into the concave portion, the structure for sliding and engaging is simplified. Further, according to the control lever structure of the folding crane according to claim 3 of the present invention, when the sliding engagement portions of the two rods are engaged with each other, the two rods are attached to the outside thereof. By attaching the fixed stator, the rigidity of the lever main body can be increased by making the engagement of both rod members more reliable.

Further, according to the control lever structure of the folding crane of the present invention, the stator is constituted by the cylindrical body slidably fitted on the outer periphery of the both rods. Just slide along the bar,
The rigidity of the lever main body can be increased by firmly fixing the engaging portions of both rod members.

[Brief description of the drawings]

FIG. 1 is an overall view showing an example of a folding crane employing a control lever structure of the present invention.

FIG. 2 is a front view of an extended state showing one embodiment of a control lever structure of the folding crane of FIG. 1;

3A and 3B are explanatory views showing details of the control lever structure of FIG. 2, wherein FIG. 3A is a sectional view taken along line BB, and FIG. 3B is a sectional view taken along line CC.

4A and 4B are explanatory views of the stored state of the control lever structure of FIG. 2, wherein FIG. 4A is a front view and FIG. 4B is a side view.

5A and 5B are explanatory views of use of the operation unit of the folding crane of FIG. 1, wherein FIG. 5A is a front view showing a use state, and FIG. 5B is a front view showing a storage state.

FIG. 6 is an explanatory view showing an example of a control lever structure of a conventional folding crane, where (a) is a front view showing an extended state, and (b) is a front view showing a stored state.

FIG. 7 is an explanatory view showing another example of the control lever structure of the conventional folding crane, where (a) is a front view showing an extended state, and (b) is a front view showing a stored state.

[Explanation of symbols]

 1 is a folding crane 2 is a column 3 is a boom 4 is an operating part 5 is a seat 6 is a lever body 7 is an upper round bar 8 is a lower round bar 9 is a cylindrical body (stator) 10 is a ball knob 11 is a lock nut 12 is a switching bracket 13 is a leaf spring holding device 14 is a concave portion (sliding engaging portion) 15 is a convex portion (sliding engaging portion) 16 is a long hole 17 is a pin

Claims (3)

[Claims] 1. A structure of a control lever provided in an operation section of a folding crane capable of bending a boom, wherein the control lever is slidable relative to each other at ends of two rods constituting a lever body. In addition to forming a slideable engagement portion that can be engaged, a long slot is formed in the sliding engagement portion of one of the bars in the sliding direction of both bars, and the other is formed of a long hole. A pin attached to the sliding engagement is passed through the elongated hole, and when the sliding engagement portions of both rods are not engaged with each other, both rods can be rotated about the pin as a shaft. Control lever structure of folding crane. 2. The sliding engagement portion is provided at a concave portion provided at an end of one of the two bars, and at an end of the other bar. The control lever structure for a folding crane according to claim 1, wherein the control lever structure comprises a convex portion that can be fitted into the concave portion. 3. The stator according to claim 1, wherein when the sliding engagement portions of the two bars are engaged with each other, a stator for fixing the both bars is attached to the outside thereof. 3. The control lever structure of the folding crane according to 2.