JP2003206911A - Expansible pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic expansible pole capable of lowering by its self-weight and serving at inclined attitude by being lowered forcedly by supply of pressure oil. <P>SOLUTION: This expansible pole is constituted in such a way that it is composed of a plurality of cylinder units connecting an inner cylinder with an outer cylinder by a connection member at a lower end, the upper cylinder unit is stored between the inner cylinder and the outer cylinder of the lower cylinder unit and is formed in a closed space communicating the inside of the inner cylinder of each cylinder unit to form a hydraulic chamber for expansion, and pressure oil is supplied into and discharged from the hydraulic chamber for expansion to expand and shrink each cylinder unit. A closed space communicating between both of the upper and lower cylinder units when the upper cylinder unit is expanded for the lower cylinder unit and communicating between a cylinder unit which is further above the upper cylinder unit and the lower cylinder unit when the upper cylinder unit is shrunk to form a hydraulic chamber for shrinkage to shrink each cylinder unit forcedly by supplying pressure oil into the hydraulic chamber for shrinkage. <P>COPYRIGHT: (C)2003,JPO

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 to move, and extends upward at a destination to be used.
The present invention relates to a telescopic pole suitable for use in a lifting mechanism for equipment such as cameras and lighting.

[0002]

2. Description of the Related Art The applicant of the present invention has previously proposed a telescopic pole in which a double-structured cylinder unit having an inner cylinder and an outer cylinder is stacked in multiple stages (utility model registration No. 2546793).
No.), as a lifting device for the above-mentioned members. This telescopic pole is formed into a closed space that communicates with the inner cylinder of each cylinder unit, and this is used as an extension hydraulic chamber, and pressure oil is supplied to and discharged from the extension hydraulic chamber to expand and contract each cylinder unit. belongs to. Therefore, compared to the conventional telescopic cylinder, etc., the structure is simple and a large number of cylinder units can be stacked.
Compared to the shortened length, a large amount of extension can be secured.

[0003]

The expansion and contraction of the telescopic pole is shortened by supplying pressure oil to the expansion hydraulic chamber to increase its volume and discharging the pressure oil to reduce its volume. ing. In this case, the pressure-receiving area of each cylinder unit is adjusted so that when expanding, the upper cylinder unit operates, and when contracting, the lower cylinder unit operates sequentially. However, since the shortening, that is, the lowering operation is due to the weight, when the insertion and the insertion of each cylinder unit is messed up or something is bitten, something trouble occurs. or,
Even if an unbalanced load is generated on the equipment placed on it or the telescopic pole is tilted, smooth descending may be hindered. For this reason, the telescopic pole is used as a vertical lifting device. Therefore, in the present invention, by forcibly performing this shortening with pressure oil, not only the state of being inclined from the vertical but also the state of being installed in the lateral direction or in the case of being turned upside down, It is designed to be able to expand and contract reliably.

[0004]

Under 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 the lower end according to claim 1, and an upper cylinder unit is provided. Is housed between the inner cylinder and the outer cylinder of the lower cylinder unit, and is formed into a closed space that communicates with the inner cylinder of each cylinder unit to form an expansion hydraulic chamber. In the telescopic pole that expands and contracts each cylinder unit by feeding and discharging, between each cylinder unit, at least when the upper cylinder unit extends with respect to the lower cylinder unit, they communicate with each other, and when shortening, the upper pole By forming a closed space that communicates with the cylinder unit further above the cylinder unit as a shortening hydraulic chamber, and supplying pressure oil to this shortening hydraulic chamber, It is obtained by providing a telescopic pole, characterized in that forcibly Chijimitan the cylinder unit.

By taking the above means, when pressure oil is supplied to the shortening hydraulic chamber, a downward force is applied to the upper cylinder unit to shorten (lower) it. When the upper cylinder unit shortens, the shortening hydraulic chamber of the upper cylinder unit communicates with the lower shortening hydraulic chamber, so that the upper cylinder unit shortens this time.
By repeating such an operation, the upper cylinder unit is gradually shortened. By the way, at the time of shortening, since the volume of the extension hydraulic chamber needs to be small, the pressure oil inside can be discharged. Specifically, when the pressure oil is supplied to and discharged from the extension hydraulic chamber and the contraction hydraulic chamber, the pressure oil in the extension hydraulic chamber is supplied when the pressure oil is supplied to the compression hydraulic chamber. It may be performed by using a directional valve that enables the discharge of the gas.

As a space for forming the shortening hydraulic chamber, a space is formed between the inner cylinder of the upper cylinder unit and the outer cylinder of the lower cylinder unit, and the space is formed as the space for forming the shortening hydraulic chamber. Is generally used. In addition, in this case, if the pressure receiving area of the shortening hydraulic chambers between the cylinder units described in claim 3 is set to be larger in the lower cylinder units, the lower cylinder units operate sequentially during the shortening. It's supposed to be safe.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are partial cross-sectional side views of a three-stage telescopic pole showing an example of the present invention, and FIG.
FIG. 9 is a cross-sectional view taken along line AA of FIG. 1, in which the telescopic pole of the present example is composed of a cylinder unit having a structure in which an inner cylinder and an outer cylinder are connected to a connecting member at a lower end, and an upper cylinder unit is an inner cylinder of a lower cylinder unit. It is movably accommodated between the cylinder and the outer cylinder.

That is, in the first cylinder unit 1 which constitutes the lowermost stage, the inner cylinder 3 and the outer cylinder 4 are erected on the connecting member 2 which is the base with a predetermined space therebetween.
In this example, the second inner cylinder 5 is provided on the outer periphery of the inner cylinder 3 with a constant gap 6 secured. The connecting member 8 of the second cylinder unit 7 is slidably accommodated between the second inner cylinder 5 and the outer cylinder 4, and the inner cylinder 9 and the outer cylinder 10 stand upright from the connecting member 8. There is. Further, the connecting member 12 of the third cylinder unit 11 is slidably accommodated between the inner cylinder 9 and the outer cylinder 10 of the second cylinder unit 7, and the inner cylinder 13 and the outer cylinder 14 are connected from the connecting member 12. And are standing up. A lid member 15, which is a pedestal on which equipments and the like are placed, is attached to the upper ends of the inner cylinder 13 and the outer cylinder 14.

From the above, each cylinder unit 1, 7,
In the connection state of 11, the upper inner cylinders 3, 9, 13 are externally fitted to the lower inner cylinders 3, 9, 13 and the upper outer cylinders 4, 10, 14 are the lower outer cylinders 4. Thus, a double structure having a high rigidity, which is to be fitted on the outer surfaces of 10 and 14, is formed. Then, upper end members 16 and 17 are provided on upper ends of the inner cylinder 3, the second inner cylinder 5 and the outer cylinder 4 of the first cylinder unit 1, respectively.
Are provided, and these are the second cylinder unit 7
The inner cylinder 9 and the outer cylinder 10 are in seal contact with each other. Also, the second
Upper end members 18 and 19 are provided at the upper ends of the inner cylinder 7 and the inner cylinder 9 of the cylinder unit 1, respectively, and these are in seal contact with the inner cylinder 13 and the outer cylinder 14 of the third cylinder unit 11. . In this case, the second inner cylinder 5 of the first cylinder unit 1, the inner cylinder 9 of the second cylinder unit 7, and the third cylinder
Constant gaps 20 and 21 are secured between the cylinder unit 11 and the inner cylinder 13.

In this case, the inner cylinders 3, 9, 13 of the respective cylinder units 1, 7, 11 are formed into a closed space which communicates with each other, which is referred to as an extension hydraulic chamber 22.
In addition, a hole 23 is formed in the upper end portion of the second outer cylinder 4 of the first cylinder unit 1 so that when the second cylinder unit 7 is extended, the outside of the second outer cylinder 4 and the second cylinder unit 7 is removed. It is adapted to communicate with a gap 20 formed between the cylinder 10. Further, the outer cylinder 1 of the second cylinder unit 7
A hole 24 is also formed in the upper end portion of 0, and is formed between the outer cylinder 10 of the second cylinder unit 7 and the inner cylinder 13 of the third cylinder unit 11 when the third cylinder unit 11 is extended. It communicates with the gap 21. When the second cylinder unit 7 and the third cylinder unit 11 are shortened, these gaps 6, 20,
21 is formed in a closed space communicating with each other, and this is referred to as a shortening hydraulic chamber 25.

Besides, the outer cylinder 4 of the first cylinder unit 1
One or a plurality of protrusions 26 are vertically formed on the inner periphery of the, and a groove 27 is formed on the outer periphery of the connecting member 8 of the second cylinder unit 7 to be fitted therein. As a result, the second cylinder unit 7 is replaced by the first cylinder unit 1
It constitutes a detent that restricts rotation in the interior. Similarly, a ridge 28 is formed on the inner circumference of the outer cylinder 10 of the second cylinder unit 7, and a groove 29 is formed on the outer circumference of the connecting member 12 of the third cylinder unit 11 so as to be fitted therein. There is. Then, in the base 2, the oil passage 3 communicating with the extension hydraulic chamber 22 in the inner cylinder 3 of the first cylinder unit 1 is formed.
0, the inner cylinder 3, and the second inner cylinder 5, and a gap 6 which is a gap 6 communicating with the shortening hydraulic chamber 25 is formed.

As described above, when pressure oil is supplied to the expanding hydraulic chamber 22 through the oil passage 30, the pressure causes the second cylinder unit 7 and the third cylinder unit 11 to expand. In this case, by setting the pressure receiving area that receives the action of the pressure oil in the order of the cover member 15 of the third cylinder unit 11, the upper end member 18 of the second cylinder unit 2, and the first cylinder unit 16, The third cylinder unit 11 expands, and when the third cylinder unit 11 has expanded completely with respect to the second cylinder unit 11, the second cylinder unit 11 starts expanding and the sequential operation is performed.

The third cylinder unit 11 and the second cylinder unit
When the cylinder unit 7 is extended, in order to shorten it, pressure oil is supplied from the oil passage 31 (at this time, the oil passage 30 is opened and the pressure oil in the extension hydraulic chamber 22 is discharged. Be prepared to do so). That is, when pressure oil is supplied from the oil passage 31, it flows into the gap 6 between the inner cylinder 3 and the second inner cylinder 5 of the first cylinder unit 1 in the shortening hydraulic chamber 25, and the second inner cylinder 5 The second inner cylinder 5 and the second inner cylinder 5 through the hole 23 of the cylinder.
It flows into the gap 20 between the inner cylinder 9 of the cylinder unit 7. When the pressure oil flows there, the second cylinder unit 7 contracts in an attempt to increase the volume of the gap 20. When the shortening is completed, the above-mentioned gap 20 is closed by the inner cylinder 9 of the second cylinder unit 7 and the inner cylinder 1 of the third cylinder unit 11.
Since it communicates with the gap 21 between the third cylinder unit 11 and the third cylinder unit 11, the third cylinder unit 11 is shortened as described above.

In this way, in the case of shortening, the lower cylinder units 7 and 11 operate sequentially. When each cylinder unit 1, 7, 11 expands and contracts, it is necessary that air can enter and leave the space between the inner cylinders 3, 9, 13 and the outer cylinders 4, 10, 14 respectively. It is sufficient to form the small holes 32 in 8, 8, 12 and the like. or,
Since the air etc. in the pressure oil must be released as appropriate,
Small holes 33 are appropriately formed in the lid member 15 and the like (34 is a check valve for preventing air inflow). In addition to the above, in the expansion and contraction, the oil passages 30 and 31 for supplying the pressure oil have to be switched, but this may be achieved by a solenoid in three directions and four positions or a manual directional switching valve 35.

Although it has been stated that such a telescopic pole is suitable for use in raising and lowering equipment, it is fixed with the base 2 downward (if it is movable, it is fixed to the bed of a vehicle or the like). Yes, the equipment may be placed on the lid member 15. By the way, the above cylinder unit has a three-stage configuration, but it goes without saying that it can have more stages.
Needless to say, the inner cylinder and the outer cylinder are firmly connected to the connecting member and the upper end member by bolting or the like, and a sliding member is provided on the sliding portion for sealing.

[0016]

As described above, according to the present invention, since the shortening of each cylinder unit is forced by the action of the pressure oil,
Even if it is installed in an inclined state from the vertical, it will surely descend. Further, it becomes possible to move the transported object laterally, pull the object upwards or downwards, or unload it downwards. Therefore, the use is expanded and the safety at that time is secured.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a telescopic pole in a shortened state showing an example of the present invention.

FIG. 2 is a partial cross-sectional side view of the telescopic pole in an extended state showing an example of the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 1 showing an example of the present invention.

[Explanation of symbols]

1 cylinder unit (first) 2 connecting members 3 inner cylinder 4 outer cylinder 7 Cylinder unit (2nd) 8 connecting members 9 inner cylinder 10 outer cylinder 11 Cylinder unit (3rd) 12 Connection member 13 Inner cylinder 14 outer cylinder 22 Hydraulic chamber for extension 25 Hydraulic chamber for shortening 35 directional valve

Claims (4)

[Claims] 1. An inner cylinder and an outer cylinder are composed of a plurality of cylinder units connected by a connecting member at a lower end, and an upper cylinder unit is housed between an inner cylinder and an outer cylinder of a lower cylinder unit, and each cylinder is An expansion hydraulic chamber is formed by forming a closed space in which the inner cylinder of the unit communicates with each other, and in an expansion and contraction pole that expands and contracts each cylinder unit by supplying and discharging pressure oil to this expansion hydraulic chamber, between each cylinder unit, At least, when the upper cylinder unit is extended with respect to the lower cylinder unit, the two are communicated with each other, and when they are shortened, a closed space is formed which is also communicated with the upper cylinder unit and the cylinder unit above it. An expansion and contraction port characterized in that each cylinder unit is forcibly shortened by providing a compression hydraulic chamber and supplying pressure oil to this compression hydraulic chamber. The 2. The telescopic pole according to claim 1, wherein a space is formed between the inner cylinder of the upper cylinder unit and the outer cylinder of the lower cylinder unit to form a hydraulic chamber for shortening. 3. The telescopic pole according to claim 1 or 2, wherein the pressure receiving area of the shortening hydraulic chamber between the cylinder units is made larger toward the lower cylinder unit, and when shortening, the lower cylinder units are operated sequentially. 4. A direction switching for supplying / discharging pressure oil to / from the extension hydraulic chamber and the contraction hydraulic chamber, and enabling discharge of pressure oil in the extension pressure oil chamber when supplying pressure oil to the contraction hydraulic chamber. The telescopic pole according to any one of claims 1 to 3, which is performed by a valve.