JPH07237893A - Telescopic pole - Google Patents

Abstract

PURPOSE:To improve the strength, to increase the quantity of extension/ retraction, to secure the operation, and to hinder the rotation in a telescopic pole, which is formed of a telescopic inner cylinder and a telescopic outer cylinder, by arranging a connecting structure, a seal structure and a turning lock structure in each specified part of both the inner and outer sleeves. CONSTITUTION:A telescopic pole is formed of a telescopic inner cylinder 10 and a telescopic outer cylinder 12. In the telescopic inner cylinder 10, plural inner cylinder sleeves 101-10n, of which upper part is fitted in the periphery of the lower part thereof adjacent to each other, are added to each other freely to be slid, and the pressure oil is supplied through the inside thereof. On the other hand, in the telescopic outer cylinder 12, plural outer cylinder sleeves 121-12n, of which upper part is fitted in the inner periphery of the lower part thereof adjacent to each other, are slidably added to each other. With this structure, the inner cylinder sleeve 10n and the outer cylinder sleeve 12n, which correspond to each other, are connected by a connecting structure 32. A seal structure 30 is arranged between each inner cylinder sleeve 10n, and a seal structure 42 and a turning lock structure 44 are arranged between each outer cylinder sleeve 12n.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic pole suitable for use in a moving camera or a mobile antenna to be loaded on a vehicle or the like, or an elevating mechanism for a member such as a work platform for raising and lowering for use.

[0002]

2. Description of the Related Art As a mechanism for raising and lowering these members, for example, a pantograph mechanism or a crane device in which links are stacked in multiple stages is generally used, but these are very large and costly. When a relatively lightweight object is lifted and lowered, a telescopic cylinder or the like is preferable because it is compact, but the conventional telescopic cylinder has at most two stages and naturally its stroke is also small. Therefore, the applicant of the present application has previously developed a multi-stage telescopic cylinder that slides the inner and outer double sleeves in multiple stages to generate a large stroke.
It was proposed as No. 03 and has received a proper evaluation.

[0003]

However, the above-mentioned proposal is not sufficient in terms of reliability of sequential operation of each sliding sleeve, the sealing structure, and the detent structure, and is a useful addition. No specific matter was given. The present invention solves such a problem and, in essence, provides a substantially completed telescopic pole of this type.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a plurality of inner cylinder sleeves whose upper one fits to the outer circumference of a lower one are slidably added to each other and communicate with the inside of each inner cylinder sleeve. A telescopic pole composed of a telescopic inner cylinder to which pressure oil is supplied and a telescopic outer cylinder in which the upper one slidably adds a plurality of outer cylinder sleeves fitted to the inner circumference of the lower one A telescopic pole characterized in that the inner cylinder sleeve and the outer cylinder sleeve are connected by a connection structure, and a seal structure is provided between the inner cylinder sleeves, and a seal structure and a rotation stop structure are provided between the outer cylinder sleeves. Is provided.

[0005]

By the above means, that is, since the inner cylinder sleeve forming the expandable inner cylinder has a larger diameter as it goes up, when it extends in relation to its pressure receiving area and weight, When shortening, the lower ones will be sequentially operated (extended and contracted) respectively, but at this time, since the inner cylinder sleeve and the corresponding outer cylinder sleeve are connected by the connecting structure, the expansion and contraction outer cylinder is also upward or downward. It will work reliably from the first one. Further, since the rotation preventing structure is provided between the outer sleeves that slide with each other, the outer sleeves do not rotate relative to each other, which is safe.

[0006]

1 and 2 are longitudinal sectional views of a telescopic pole showing an embodiment of the present invention. This telescopic pole is a telescopic inner cylinder 1
0 and the telescopic outer cylinder 12 are concentric with each other and are erected from a base 14 that supports them, and a table 16 on which an upper and lower object is placed.
Is attached. The expandable inner cylinder 10 includes a plurality of inner cylinder sleeves 10 in which the upper one fits the outer circumference of the lower one.
₁ ‥ _n a are those in which replenishment slidably respectively, telescoping outer tube 12 is replenished upper ones below the ones of the inner circumferential plurality of which fits into the outer cylinder sleeve 12 ₁ ‥ _n slidably respectively It is a thing.

FIG. 3 is a vertical cross-sectional view of the base 14 portion. A flange 11 is provided on the lower end of the innermost sleeve 10 _{1 at} the lowermost stage.
Is attached by screwing or the like, the flange 11 is inserted into the base 14 and fixed by a stop ring 18 or the like so as not to come out, and the outermost sleeve 12 _{1 at the} lowermost stage is also attached to the base 1
It is fixed by screwing it on 4. FIG. 4 is a vertical cross-sectional view of the table 16 portion. The table 16 is fitted onto the outer circumference of the innermost sleeve 10 _{n at} the uppermost stage, and the outermost sleeve 12 _n at the uppermost stage is fixed to the outer sleeve 12 _n by screwing or the like. To do.

The insides of the inner sleeves 10 ₁ ... _N are in communication with each other, and pressure oil is supplied to them. Specifically, a pressure oil supply port 20 is formed in the base 14 so as to face the inside of the inner sleeves 10 ₁ ... _N , and the pressure oil is supplied from here. Along with this, the air vent hole 22 communicating with the inside of the inner cylinder sleeves 10 ₁ ... _N is attached to the table 16 or the like by inserting a check valve 24 or the like for preventing pressure oil leakage, and the pressure oil is supplied. Sometimes only the air escapes. Besides this, the base 14
A drain drain 28 that communicates with a space 26 between the expandable inner cylinder 10 and the expandable outer cylinder 12 is also formed therein.

A seal structure 30 is provided between the inner cylinder sleeves 10 ₁ ... _n that slide with each other, and each inner cylinder sleeve 10 ₁ ... _n corresponds to this (the N-th inner cylinder sleeve 10 _n is are connected by a n-th related such outer barrel sleeve 12 _n) outer cylinder sleeve 12 ₁ ‥ _n and the connecting structure 32. Figure 5 is a sectional view of a main part showing an example of the sealing structure 30 and the connecting structure 32, but the ring 36 that holds the sealing member 34 in sliding contact with the outer periphery of the inner cylinder sleeve 10 ₁ ‥ _m below the upper _N is screwed onto the lower end of the inner sleeves 10 ₂ ... _N , and is fastened to the lower end of the outer sleeves 12 ₂ ... _N corresponding to the upper inner sleeves 10 ₂ ... _N by using a stop ring or the like 38. The ring 32 has a telescopic inner cylinder 10
A hole 40 that communicates the space 26 between the expansion and contraction outer cylinder 12 is formed.

A seal structure 42 and a detent structure 44 are provided between the outer sleeves 12 ₁ ... _N that slide with each other.
5 and 6 show the seal structure 42 and the rotation stop structure 44.
It is a longitudinal cross-sectional view and a cross-sectional view of the main part showing a specific example of
Of these, the seal structure 42 is the lower outer sleeve 12
₁ is a sealing ring 46 the inner periphery in sliding contact with the two sheets of the ‥ _m on the outer periphery of the upper outer cylinder sleeve 12 ₂ ‥ _n that fitted apart predetermined intervals.

[0011] detent structure 44, previously form embossing the keyway 48 along the axial direction on the outer periphery of the upper outer cylinder sleeve 12 ₂ ‥ _n, equal screwed into the outer cylinder sleeve 12 ₁ ‥ _m lower A key 52, etc., which is fitted into the key groove 48, is attached to the ring 50 which is fixed by fixing. The key groove 48 is formed in a portion other than the portion where the outer cylinder sleeve 12 ₁ ‥ _n polymerizes when extended to the maximum, are as not to impair the sealing function.
Further, to hold the sealing member 54 in sliding contact with the outer periphery of the outer cylinder sleeve 12 ₁ ‥ _n the ring 50, which also seal structure 4
2

To extend the telescopic pole having the above structure, pressure oil is supplied to the inside of the telescopic inner cylinder 10. in this case,
The unit composed of the innermost sleeve 10 _n and the outermost sleeve 12 _{n at the} uppermost stage has the largest pressure receiving area and the lightest weight, so that this unit first expands. Outer sleeve 12
_{When n} is extended by a certain amount, the seal ring 46 at the lower end _hits the ring 50 of the second outer sleeve 12 _m from the top and cannot be extended any more. Then, the second unit expands, and thereafter, in the same manner, when the last unit finishes expanding, the maximum expansion is achieved.

When shortening the telescopic pole, the pressure oil inside the telescopic inner cylinder 10 is allowed to escape freely. In this case, the second unit from the bottom, consisting of the inner sleeve 10 ₂ and the outer sleeve 12 _2, has the smallest pressure receiving area and the heaviest weight among the movable units. Ring 36 of the inner sleeve of this unit
When it hits the bottom surface of the base 14 or the like, the contraction of this unit is completed, and thereafter, the contraction is completed in the order of the second and third units, and when the last unit is completed, the contraction is maximum.

Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the seal structures 30 and 42, the connecting structure 32, the detent structure 44, and the like described above are not limited to these, but include various modified forms. Also, although the inner cylinder sleeves 10 ₁ ... _N and the outer cylinder sleeves 12 ₁ ... _N in this example have four stages, of course, the number is not limited to this, and a maximum of about 10 stages is possible. .

In addition to this, it is also conceivable to form a blower port in the base 14 and blow warm air from here to the space 26 between the expandable inner cylinder 10 and the expandable outer cylinder 12. This way,
The sliding property of each sliding part is improved to reduce sliding resistance (thus, it is suitable for use in cold weather, etc.), and the pressure inside the space 26 can be increased to prevent rainwater from entering. Of.

[0016]

EFFECTS OF THE INVENTION The present invention is as described above, that is, since it is composed of a double cylinder including a telescopic inner cylinder and a telescopic outer cylinder, it has high strength and a long telescopic amount. Since the pressure oil is supplied only to the inside of the expandable inner cylinder with a small diameter, in addition to the advantage that the amount of oil is small, it is compatible with the inner cylinder sleeve and the outer cylinder sleeve that make up the expandable inner cylinder and the expandable outer cylinder. These units are connected to each other as a set, so the sequential operation of each unit is reliable, and the rotation prevention structure is applied between the outer sleeves so that they can rotate with each other. Therefore, various useful effects such as expansion and contraction can be expected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a telescopic pole showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a telescopic pole showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view of a base portion of a telescopic pole showing an embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a table portion of a telescopic pole showing an embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 6 is a transverse cross-sectional view of a main part showing an embodiment of the present invention.

[Explanation of symbols]

10 Expansion and contraction inner cylinder 10 _n Inner cylinder sleeve 12 Expansion and contraction outer cylinder 12 _n Outer cylinder sleeve 26 Space 30 Seal structure 32 Connection structure 42 Seal structure 44 Rotation stop structure

Claims (2)

[Claims] 1. A plurality of inner cylinder sleeves, each of which is fitted to the outer circumference of the lower one, is slidably added to the outer one,
A telescopic inner cylinder that communicates with the inside of each inner tubular sleeve and is supplied with pressure oil, and a telescopic outer tube that slidably adds a plurality of outer tubular sleeves that fit into the inner circumference of the lower one. In the telescopic pole composed of, the corresponding inner cylinder sleeve and outer cylinder sleeve are connected by a connection structure, and a seal structure is provided between each inner cylinder sleeve and a seal structure and a rotation stop structure are provided between each outer cylinder sleeve. Telescopic poles characterized by each. 2. The telescopic pole according to claim 1, wherein warm air is supplied to a space between the telescopic inner cylinder and the telescopic outer cylinder.