JP2002213409A - Telescopic pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothen telescopic motion and to miniaturize an overall device in a multistage hydraulic cylinder composed of inner and outer cylinders. SOLUTION: In this telescopic pole composed of plural cylinder units, respectively formed by connecting the inner cylinder and the outer cylinder by a connecting member of a lower end, the upper inner cylinder is movably fitted externally to the lower inner cylinder, the upper outer cylinder and the connecting member are fitted slidably internally to the lower outer cylinder to connect the upper and lower cylinder units, a closed space is formed with communicating inner cylinders, and the cylinder units are expanded and contracted by feeding and discharging the pressure oil to the closed space, plural projections are in longitudinally formed on an inner periphery of each outer cylinder, grooves are formed on the outer periphery of each connecting member fitted internally to the outer cylinder, and the projections are fitted in the grooves for the mutual detention of the cylinder units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna which is loaded on a vehicle or the like and moves, and is used by extending upward at a destination.
The present invention relates to a telescopic pole suitable for use in a mechanism for elevating equipment such as a camera and lighting.

[0002]

2. Description of the Related Art As a mechanism for elevating and lowering these members, for example, a pantograph mechanism or a crane device in which links are stacked in multiple stages is generally used. Become. When elevating and lowering relatively light equipment, a telescopic cylinder or the like is compact and preferable. However, a conventional telescopic cylinder has a complicated structure, has at most two steps, and naturally has a small stroke. In view of this, the present applicant has previously proposed a telescopic pole that derives a large stroke by stacking multiple cylinder units of a double structure including an inner cylinder and an outer cylinder in multiple stages (utility model registration No. 25467).
No. 93).

[0003]

In this case, since it is dangerous that the cylinder units rotate relative to each other while the telescopic pole is operating (expanding or contracting), a rotation stopping mechanism is provided to restrict the rotation. As shown in Japanese Patent No. 2671022, which is also owned by the present applicant, a conventional detent mechanism digs a keyway up and down on the outer circumference of an outer cylinder, and the inner circumference of an outer cylinder fitted to the outer cylinder. And the key was fitted into the keyway. However, according to this structure, since the key groove is exposed to the outside, dirt and the like enter the key groove, and the sliding becomes impossible. In addition, when the keyway is extended, the keyway becomes visible, which impairs the external fitting design. Further, since only one key is provided on the outer periphery, the shape of the key and the key groove becomes very large, the thickness of the outer cylinder increases, and the overall diameter increases. The present invention has solved such a point.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention comprises a plurality of cylinder units in which an inner cylinder and an outer cylinder are connected by a connecting member at a lower end according to claim 1; The outer cylinder is movably fitted to the lower inner cylinder, and the upper outer cylinder and the connecting member are slidably fitted to the lower outer cylinder to connect the cylinder units up and down and to communicate with the inside of each inner cylinder. In a telescopic pole that is formed in a closed space and expands and contracts a cylinder unit by supplying and discharging pressure oil to and from this closed space, a plurality of protrusions are vertically provided on the inner periphery of each outer cylinder, and the inner cylinder is fitted into the outer cylinder. A groove is formed on the outer periphery of each connecting member to be formed, and a protrusion is fitted into the groove to prevent rotation of the cylinder units, thereby providing a telescopic pole.

[0005] By taking the above-described means, a ridge vertically provided on the inner periphery of each outer cylinder and a groove formed on the outer periphery of each connecting member fitted inside the outer cylinder are fitted. Therefore, the groove is not exposed to the outside, and no dust or the like adheres.
Therefore, a dust seal or the like that eliminates this becomes unnecessary,
The structure becomes simple. In addition, since a plurality of sets of ridges and grooves are provided, the shape per one may be small, the thickness of the inner and outer cylinders can be suppressed, and the overall diameter can be reduced. Further, since the groove is not visible from the outside, the design is excellent.

According to the present invention, in the above telescopic pole, the outer periphery of the connecting member is in sliding contact with the inner periphery of the lower outer cylinder, and the connecting member is formed of the inner cylinder. Means are provided having an upper portion extending a predetermined length along the outer circumference. Since the connecting member constituting the cylinder unit is in sliding contact with the lower outer cylinder, the sliding is smooth.
In addition, since the upper extension extends along the outer circumference of the inner cylinder by a predetermined length, the strength of the inner cylinder is increased, and the deterrent force against falling down is strong. Further, at this time, according to the means described in claim 3, when each cylinder unit is extended, the upper end of the upper extension portion hits a ring provided at the upper end of the outer cylinder of the lower cylinder unit and serves as a stopper. When the telescopic pole is used in an extended state, the rigidity is further increased due to the three-piece configuration in which the upper extension is interposed between the outer cylinders to be superimposed over the entire length.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are longitudinal sectional views of a four-stage telescopic pole showing an example of the present invention, and FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG. 1. This telescopic pole has an inner cylinder _1n and an outer cylinder. becomes a 2 _n from the cylinder unit 4 _n which is connected by a connecting member 3 _n of the lower end, the inner cylinder 1 _n the upper externally fitted movably in the inner cylinder 1 _n-1 of the lower, upper outer cylinder 2 _n and the connecting The member 3 _n is slidably fitted in the lower outer cylinder 2 _n-1 and connects the cylinder unit 4 _n up and down.

[0008] Sokuchi, cylinder unit 4 ₁ of the lowest stage,
The inner cylinder 1 ₁ in the center of the base 5 for supporting the telescopic pole as a coupling member 3 _1, in which the outer cylinder 2 ₁ is erected and fixed coaxially around. Then, the upper end of the outer tube 2 _1, so as not to fall to form a stage or the like to the inner periphery of the outer cylinder 2 ₁ in sliding contact with the outer periphery of the outer tube 2 ₂ of the cylinder unit 4 ₂ of the second stage from the bottom the ring 6 ₁ fitted, and a stopper ₇₁ that is attached stopped is provided by screwing or the like on the outer periphery of the outer cylinder 1 ₁ in order to regulate the extraction of the above the ring _61.
Moreover, the base 5, the oil passage 8 leading to the inner cylinder 1 ₁ is connected to a hydraulic unit (not shown) is formed.

[0009] On the contrary, the cylinder unit 4 ₂ of the second stage from the bottom, the inner cylinder 1 ₂ and the outer cylinder 2 ₂ fixedly from the connecting member 3 ₂ sliding contact with the outer periphery of the inner cylinder 1 ₁ at the lowest It has been raised. In this case, the outer periphery of the connecting member 3 ₂ is in sliding contact with the inner periphery of the outer cylinder 1 ₁ at the lowest, these outer cylinder 2 _1, 2 ₂
Each other so that the supporting each other with the connecting member 3 ₂ and the ring _61. Therefore, it is supported in a certain span, and the sliding is smooth and the suppressing force against falling down is high.

Furthermore, above the connecting member 3 _2, Uwanobu 9 ₂ along a predetermined length is provided on the inner cylinder 1 _2. or,
The upper end of the outer tube 2 _2, as in the cylinder unit 4 ₁ of the lowermost and stopper 7 ₂ a similar ring 6 ₂ are provided. In addition, the cylinder unit 4 ₃ of the third stage from the bottom,
It has a similar configuration.

[0011] On the other hand, cylinder unit 4 ₄ of the uppermost,
Is basically the same as this, only, because it more upward no outer cylinder may be combined with the outer cylinder 2 ₄ inner cylinder 1 _4. Top member 10 instead, the upper end of the inner cylinder 1 ₄
A table 1 on which an object to be lifted (not shown) is mounted
1 is fixed.

By the way, in each of the outer cylinders 2 _n , a ridge 12 _n is provided on the inner periphery so as to protrude vertically. This ridge 12
_Although there are various shapes of _n , this example shows a key shape. The formation of the ridges 12 _n, if the material in an aluminum pipe, can be easily formed by extrusion or the like (of course, digging keyway, it may be fitted key).
Along with this, on the outer periphery of the connecting member 3 _n , this ridge 12 _n
So that the fits writes groove 13 _n is formed. It should be noted that a plurality of sets of the ridges 12 _n and the grooves 13 _n are provided, and in this example, one set is equally divided on the circumference.
The ridges 12 _n and the grooves 13 _n serve as detents for restricting the outer cylinders 2 _{n from} rotating with each other.

The telescopic pole having the above-described structure is
Cylinder unit 4_n-1 Upper cylinder unit 4_n 
It is assembled by inserting. That is, the bottom row
Cylinder unit 4₁ The second cylinder unit from the bottom
To 4_Two After inserting the ring 6 _Two And the stopper 7_Two To
It is sufficient to stop this operation,
Set 4_n It is good to apply to.

The above inner cylinder 1_n Inside is a closed space that communicates
It is formed. Even in this case, the inner cylinder 1 _n Slide around
Connecting member 3_n Seal member 14_n Is provided
And the inner cylinder 1_n Within the pressure oil described later
Also, there is no danger of these leaking out._n 
Stopper 7 sliding on the outer circumference of_n Sealing member 15 on the inner circumference of
_nIs provided). As described above, pressure oil is supplied from the oil passage 8.
When supplied, has the largest diameter first due to the difference in inner diameter
Innermost cylinder 1_Four Upper extension 9_Four Is the second stage phosphorus from the top
Group 6_Three Elongate (rise) until it hits.

At this point, the upper extension 9 _n and the ring 6 _n
This constitutes a stopper that determines the extension limit. When the topmost cylinder unit 4 ₄ is fully extended, the second cylinder unit 4 from the top is again determined from the difference in inner diameter.
₃ is extended, then repeats the sequence operation of the third stage cylinder unit 4 ₂ is expanded, and eventually all the cylinder units 4 _n in a state of being stretched. On the other hand, if the oil passage 8 continue to discharge the pressurized oil, likewise in turn by the inner diameter difference cylinder unit 4 ₁ of lowermost Chijimitan (downward)
Thereafter, the same operation is repeated in the order of the second and third stages from the bottom.

Since such a telescopic pole has a double structure composed of an inner cylinder and an outer cylinder, it has a high effect of suppressing falling. Further, it is a very simple configuration in which the inner cylinder is movably fitted, the interior thereof is communicated, and pressure oil is supplied to and discharged from the inner cylinder to expand and contract. Accordingly, the number of stages can be increased (up to 12 or 3 stages), and a sufficient extension length can be obtained. In this regard, if an antenna, a camera, lighting, or the like used at a high place is attached to this telescopic pole, it can be loaded on a vehicle or the like and moved. Needless to say, the advantages described above do not change even when fixedly installed and used.

[0017]

The present invention has been described above, that is, since a ridge and a groove to be fitted therein are formed on the inner periphery of an outer cylinder which is slidably fitted to each other. The ridges and grooves are not exposed to the outside, and no dust or the like adheres. Therefore, a dust seal or the like for eliminating this is not required, and the structure is simplified. In addition, since a plurality of sets of ridges and grooves are provided,
The shape of each piece may be small, the thickness of the inner and outer cylinders can be suppressed, and the overall diameter can be reduced. Further, since the groove is not visible from the outside, the design is excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of the present invention in an extended state of a telescopic pole.

FIG. 2 is a longitudinal sectional view showing a contracted state of a telescopic pole showing an example of the present invention.

FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Connecting member 4 Cylinder unit 6 Ring 9 Upper extension part 12 Protrusion 13 Groove

Claims (4)

[Claims] An inner cylinder and an outer cylinder are connected to each other by a connecting member at a lower end, and a plurality of cylinder units are connected. An upper inner cylinder is movably fitted to a lower inner cylinder. The cylinder unit is slidably fitted in the lower outer cylinder to connect the cylinder unit up and down, and is formed in a closed space that communicates with each inner cylinder, and pressurized oil is supplied to and exhausted from the closed space to form the cylinder unit. In the telescopic pole to be expanded and contracted, a plurality of ridges are vertically provided on the inner circumference of each outer cylinder, and a groove is formed on the outer circumference of each connecting member to be fitted in the outer cylinder, and the ridge is fitted into this groove. A telescopic pole characterized in that the rotation of the cylinder units is stopped by doing so. 2. An outer periphery of a connecting member is in sliding contact with an inner periphery of a lower outer cylinder, and the connecting member has an upper extending portion extending a predetermined length along an outer periphery of the inner cylinder. The telescopic pole of claim 1. 3. When each cylinder unit is extended,
3. An upper end of the upper extension portion contacts a ring provided on an upper end of the outer cylinder of the lower cylinder unit to serve as a stopper.
Telescopic pole. 4. The telescopic pole according to claim 1, wherein the ridges of each outer cylinder are three keys arranged in the same phase on the circumference at equal intervals.