JPH0214531Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a float structure used for an outrigger jack for a truck crane or an outrigger jack for vertically disassembling a crane body.

(b) Prior art Figure 3 is a side view showing the working posture of a truck crane equipped with an outrigger jack according to the present invention;
FIG. 4 is a side view showing its moving attitude. Third
In the figures and FIG. 4, reference numeral 1 denotes a crane body rotatably mounted on the upper part of the carrier 2. A load 4 is suspended from the front part of the crane body 1 via a boom 3. Reference numeral 5 denotes outrigger jacks attached to the four corners of the lower surface of the carrier 2. The outrigger jacks 5 support the entire weight of the crane main body 1, boom 3, hanging load 4, etc. The outrigger jack 5 is composed of a jack main body 5a and a float 5b, and when the truck crane is moved, as shown in FIG. 4, the jack cylinder of the jack main body 5a is reduced and the float 5b is
Also store it in the appropriate place on carrier 2.

Next, the float structure of a conventionally used outrigger jack will be explained with reference to FIGS. 5 and 6. FIG. 5 is a partially sectional side view, and FIG. 6 is a plan view. The float of the outrigger jack is
It has a welded integral structure consisting of a jack mounting part 6, a swash plate 7, a ground plate 8, and a strut 9. The jack mounting portion 6 is a portion that receives the supporting force of the jack cylinder, and is made of a steel material with a hardened surface so that it can withstand a large load. In addition, the swash plate 7, the ground plate 8
For the support column 9, an aluminum plate or a thin steel plate is used in order to reduce the weight.

As the crane becomes larger, the total weight of the crane body 1, boom 3, hanging load 4, etc. shown in FIG. 3 becomes heavier, and the load acting on the float 5b also becomes larger. In this case, if the ground pressure of the float 5b increases, there is a risk of the ground sinking, concrete damage, etc., so the ground pressure of the float 5b needs to be lower than a certain value.

Therefore, when increasing the area of the ground plate 8 of the float from L _{1 to} L ₂ as shown in FIG. ₁ to θ ₂ , when the reaction force F acts on the ground plate 8, the force F ₁ that acts on the swash plate 7
Since F ₂ becomes large in the swash plate 7', it is necessary to increase the thickness of the swash plate 7' to strengthen it.

Also, if the height of the float is changed from H ₁ to H ₂ while keeping the inclination angle θ ₁ of the swash plate 7 unchanged, the force acting on the swash plate 7″ remains the same as F ₁ , but the height of the float remains the same. As the height increases, the buckling strength of the swash plate 7'' decreases, so it is also necessary to increase the thickness of the swash plate 7''.

Increasing the area of the ground plate 8 in this way increases the weight of the ground plate 8 and support column 9, as well as the weight of the swash plate 7. Therefore, it is necessary to manually attach and detach the float alone. There is a drawback that it becomes impossible to do so.

(c) Problems that the invention aims to solve This invention was created in view of the above problems, and its purpose is to reduce the weight of the float of an outrigger jack as cranes become larger. To provide a float structure for an outrigger jack that can be installed and removed manually even when the size increases.

(d) Means for solving the problem In order to achieve this objective, the present invention includes a jack mounting part provided at the top of the column, a ground plate fixed to the bottom surface of the column, and the jack mounting part. In the float structure of an outrigger jack consisting of a swash plate disposed between a ground plate, an intermediate portion of the swash plate and the support is divided parallel to the ground plate,
A connecting plate is inserted into the divided surface and the upper and lower parts are removably attached, and a stepped fitting part is formed in the divided surface of the column.

(e) Embodiment Hereinafter, an embodiment of the present invention will be described in more detail with reference to FIGS. 1 and 2. FIG. 1 is a side view showing the left half in section, and FIG. 2 is a plan view thereof. The outrigger jack float of the present invention includes a jack mounting part 11, a swash plate 12 divided into two parts, an upper swash plate 12a and a lower swash plate 12b, a ground plate 13, an upper support 14a and a lower support 14b. The strut 14 divided into two, the swash plate 12 and the strut 1
It is composed of an upper connecting plate 15, a lower connecting plate 16 inserted into the dividing surface between the connecting plates 15 and 4, and mounting bolts 17 for both connecting plates 15 and 16. and upper support 1
A stepped fitting part 18 for positioning is formed on the dividing surface between 4a and the lower support 14b.

Here, if the dimension of the ground plate 13 is L ₂ , the inclination angle of the swash plate 12 is θ ₁ , and the heights of the upper swash plate 12a and the lower swash plate 12b are H ₂ and H ₄ respectively, the effect on the swash plate 12 is assumed to be The force to be applied remains F ₁ as before, and the heights of the swash plates 12a and 12b are also H ₂ < compared to the conventional case.
Since H ₁ , H ₄ <H ₁ , the buckling strength is sufficient, and there is no need to make the swash plate 12 thicker than before. Therefore, during work, the upper and lower sides of the float are fixed with the mounting bolts 17, so the float becomes a single piece like the conventional float, and when transported, the float can be divided into two parts by removing the mounting bolts 17. Can be carried in a lightweight state.

In the embodiment, an example of dividing the float into two is shown, but it goes without saying that the float can be divided into three or more parts as necessary.

(f) Effects of the invention As described above, according to the invention, the float is configured to be horizontally divisible into a plurality of pieces.
Even if the float is large enough to withstand a large load, by dividing it into parts that can be carried, it is possible to attach and detach the float manually. Particularly in mobile cranes, where the floats are frequently attached and removed, they can be carried by hand without using an auxiliary crane, which has the effect of reducing costs for dividing and assembling.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a partially sectional side view, Figure 2 being a plan view, and Figure 3 showing an embodiment of the invention. FIG. 4 is a side view showing the working position of the truck crane, FIG. 4 is a side view showing the moving position thereof, and FIGS. 5 and 6 are a partially sectional side view and a plan view showing a conventional example. 11...Jacket mounting part, 12...Swash plate, 12
a... Upper swash plate, 12b... Lower swash plate, 13...
Ground plate, 14... Support column, 14a... Upper support column, 1
4b... Lower support column, 15, 16... Connection plate, 17
...Mounting bolt, 18...Stepped fitting part.

Claims (1)

[Scope of utility model registration request] A float structure for an outrigger jack, which is composed of a jack mounting part provided on the upper part of the column, a ground plate fixed to the bottom surface of the column, and a swash plate arranged between the jack fitting part and the ground plate. In this method, the middle part of the swash plate and the support column is divided parallel to the ground plate, a connection plate is inserted into the divided surface and the upper and lower parts are removably attached, and a stepped fitting part is provided on the divided surface of the support column. The float structure of the outrigger jack is characterized by the formation.