JPH0328068Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention relates to a sealing device for a telescoping boom for shielding an opening between an outer boom and an inner boom in a telescoping boom for an aerial work vehicle, etc. In particular, it has excellent ability to follow irregularities and steps on the surface of the inner boom.

(2) Prior Art Providing a sealing material at the tip of the outer boom of a telescopic boom connected in a telescopic manner so as to be in slidable contact with the outer circumferential surface of the inner boom and shielding the opening between the inner boom and the outer boom is as follows. Kimiaki Sane
As described in Japanese Patent Application No. 58-15440, it has been conventionally known.

(3) Problems that the invention aims to solve However, because the conventional sealing material was simply divided into sections corresponding to each side of the inner boom, if the surface of the inner boom was smooth, the openings However, if the surface of the inner boom is uneven or stepped, there is a problem in that a gap is left between the sealing material and the surface of the inner boom.

(4) Means for Solving the Problems In order to solve the above problems, the present invention provides a structure in which the tip of the outer boom of telescopic booms connected in a telescopic manner is slidably contacted with the outer peripheral surface of the inner boom. In the sealing device provided with a sealing material for shielding an opening between an inner boom and an outer boom, a plurality of slits are provided in the sealing material attached to the left and right sides of the outer boom in parallel with the direction of expansion and contraction of the inner boom. It is something.

(5) Effect With the above configuration, when the inner boom is expanded and contracted with respect to the outer boom, the sealing material slides in contact with the surface of the inner boom, and if there are unevenness or steps on the surface of the inner boom, the seal material slides into the slit. This causes the sealing material to slide on the surface of the inner boom, following the unevenness or step.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the telescopic boom, an inner boom 2 is connected to an outer boom 1 in a telescopic manner.
expands and contracts with respect to the outer boom 1,
A sealing device 3 is provided on four sides of the tip of the outer boom 1 so as to be in slidable contact with the outer circumferential surface of the inner boom 2 to shield the opening between the inner boom 2 and the outer boom 1.

As shown in FIG. 2, the sealing device 3 has a bracket 4 attached to each side of the tip of the outer boom 1 diagonally toward the inner boom 2, and the bracket 4 is made of an elastic material such as rubber or plastic. The sealing material 5 is attached so that its tip is in contact with the surface of the inner boom 2, and the sealing material 5 is fixed to the bracket 4 with a plate 6.
A plurality of slits 50 are formed at the tip of the sealing material 5 attached to the left and right side surfaces of the outer boom 1 at predetermined intervals in parallel to the direction of expansion and contraction of the inner boom 2.

With the above configuration, the opening between the inner boom 2 and the outer boom 1 is shielded on each side by the sealing material 5 of the sealing device 3, and even when the inner boom 2 is expanded or contracted with respect to the outer boom 1, the opening between the inner boom 2 and the outer boom 1 is covered by the sealing material 5. Since the tip portion slides on the surface of the inner boom 2, the shielding state between the inner boom 2 and the outer boom 1 is maintained, and foreign matter is prevented from entering the telescopic boom. If there is a step or unevenness on the surface of the inner boom 2 due to reinforcement etc., the second
As shown in Figures 3 and 3, the sealing material 5 in the part that contacts the reinforcement 20 is separated from other parts by the slit 50 and comes into contact with the surface of the reinforcement 20, so the sealing material 5 and the inner boom 2 are separated by steps or unevenness. There are no large gaps between them.

(7) Effects of the invention As described above, according to the invention, it is possible to improve the ability of the sealing material to track unevenness and steps on the surface of the inner boom with a simple configuration.
According to the present invention, it is possible to improve the shielding performance of the seal device that shields the opening between the inner boom and the outer boom.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a telescopic boom equipped with a sealing device, FIG. 2 is a sectional view showing the configuration of the main parts, and FIG. be. 1... Outer boom, 2... Inner boom, 3
...Sealing device, 5...Sealing material, 50...Slit.

Claims (1)

[Scope of utility model registration request] In a sealing device, a sealing material is provided at the tip of an outer boom of a telescoping boom connected in a telescoping manner, and a sealing material is provided in slidable contact with the outer peripheral surface of the inner boom to shield an opening between the inner boom and the outer boom. A sealing device for a telescopic boom, characterized in that a plurality of slits are formed in the sealing material attached to the side surface in parallel to the direction of expansion and contraction of the inner boom.