JPH03191183A - Pneumatic pressure elevation type hollow pole - Google Patents

Abstract

PURPOSE:To improve functionality by providing upper and lower hollow pole members, a lower inner cylinder member rotatably arranged at the central section of the lower hollow pole member, and a male screw member with a collar section for engagement and a wedge member. CONSTITUTION:Compressed air is introduced into both upper and lower hollow pole members 11, 21 and intermediate hollow pole members 31A, 31B from the compressed air port 23 of the lower hollow pole member 21. The group of the member 11, an upper male screw member 51 and an upper wedge member 61 screwed by a female screw 15 and the group of the members 31A, 31B and an intermediate male screw member 51 and an intermediate wedge member 61 are lifted together. When the lower end sections of the member 11 and the members 31A, 31B reach the height at the upper end sections of members 31A, 31B on the side lower than said members 11, 31A, 31B by one stage respectively, compressed air is removed, and said members 11 and 31A, 31B are supported by the members 31A, 31B, 21 on the lower side. Accordingly, expansion and contraction are facilitated, thus improving functionality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pneumatic lifting type hollow pole which is used by attaching, for example, a lighting device, a television camera, etc. to the top of the pole.

Conventional technology Conventional lighting poles, for example, are generally fixed types made of tapered aluminum tubes, and when replacing a lighting bulb, they must be tipped over from their foundation or removed from the middle of the height of the pole. Lighting poles that can be bent are known, but in either case, the lighting pole must be turned sideways, making it extremely troublesome to replace light bulbs, and there are restrictions on where the pole can be installed. Ta.

Incidentally, an extendable hollow pole in which a hollow pole member is raised and lowered by a screw feeding mechanism is already known (for example, see Japanese Patent Laid-Open No. 64-49764).

In recent years, for example, a television camera has been attached to the top of such an extendable hollow pole to take pictures from a desired height by remote control.

Problems to be Solved by the Invention The known telescoping hollow pole as described above certainly allows for the installation of lighting bulbs, television cameras, etc. on the top of the pole very easily without having to tilt the pole sideways, and also allows for easy installation of light bulbs, television cameras, etc. However, it is not subject to the restrictions of
The telescoping hollow pole is made up of three connected pole members, and it is not possible to connect four or more pole members.Moreover, since the pole members are raised by a screw feeding mechanism, the raising and lowering speeds are limited. There was a problem that it was a little slow.

In addition, since the number of screw feed members used to raise and lower the hollow pole member is large and they are long, cutting them is relatively troublesome, making it difficult to manufacture telescopic hollow poles.
There was a problem.

An object of the present invention is to solve the above-mentioned problems, and to enable the pole member to be raised and lowered by pneumatic pressure without using a conventional screw feeding mechanism. Since the pole member can be reliably locked (stopped) at the height,
In addition to being able to freely set the overall length of the pole to any desired length, the lock can be reliably released using a simple short screw feed mechanism.For example, when a television camera is attached to the top of a hollow pole. , it is possible to take pictures from a desired height by remote control, and even when a lighting device is attached to the top of a hollow pole, it is extremely easy to change light bulbs, etc. without having to tip the pole sideways. In addition, there are no restrictions on installation location, four or more pole members can be freely connected, and the pole lifting mechanism is not visible from the outside.
We are trying to present a pneumatic lift type hollow pole which has a very beautiful appearance.

Means for Solving the Problems In order to achieve the above-mentioned object, a first aspect of the present invention is to provide a lower hollow pole member that is installed in an upright manner on a base, and a lower hollow pole member that is slidably fitted into the lower pole member and has a tapered shape. an upper hollow pole member having a shaped lower end; a lower inner cylinder member rotatably disposed at the center of the lower hollow pole member;
A male screw member that is slidably fitted over the inner cylinder member and has an engaging flange at its lower end; and a wedge member having an occluded circular shape, and a top wall is provided at the upper end of the upper hollow pole member,
A female thread is provided inside the lower end of the pole member, a male thread member is screwed into the female thread, an inwardly protruding stopper is provided at the upper end of the peripheral wall of the lower hollow pole member, and a compressed air port is provided at the bottom of the peripheral wall. The wedge member has a wedge-shaped cross-sectional convex portion having a tapered surface that fits with the tapered lower end of the upper hollow pole member on the inside, and an engaging portion provided below the convex portion via a hanging wall having a predetermined height. The distal end of the engagement flange of the externally threaded member is positioned between both the protrusions of the wedge member, and compressed air is introduced into both the upper and lower hollow pole members. When the hollow pole is extended, the tip of the collar engages with the wedge-shaped convex cross section of the wedge member from below, causing the upper hollow pole member, male thread member, and wedge member to rise together, and the hollow pole When contracting, the tip of the flange of the male threaded member that has descended due to the rotation of the lower inner cylindrical member is engaged from above with the engaging inward protrusion of the wedge member, and the tapered lower ends of the wedge member and the upper hollow pole member are The gist is a pneumatically lifted hollow pole that can be disengaged from the body.

Next, a second invention of the present invention is such that in order to further increase the length of the pneumatic lifting type hollow pole of the first invention, an intermediate hollow pole member is connected, and an upper hollow pole member and a lower hollow pole member are connected. At least one slidable intermediate hollow pole member having a tapered lower end portion between the pole members, an intermediate inner cylinder member rotatably disposed at the center of each intermediate hollow pole member, and each intermediate hollow pole. an intermediate male threaded member screwed into the female thread on the inside of the lower end of the member, fixed to the lower end of the intermediate inner cylindrical member, and having an engaging flange at the lower end; An intermediate wedge member having a notched circular shape when viewed from a plane disposed along the inner surface of the lower inner cylinder member or the intermediate inner cylinder member is interposed, and the intermediate wedge member has a tapered lower end portion of the upper hollow pole member inside. Alternatively, a wedge-shaped convex cross section having a tapered surface that fits into the tapered lower end of the intermediate hollow pole member one step above, and an engaging inner side provided below this via a hanging wall of a required height. The distal end of the engagement flange of the intermediate male threaded member is positioned between both the protrusions of the intermediate wedge member, and compressed air is introduced into both the upper and lower hollow pole members and the intermediate hollow pole member. When the introduced hollow pole is extended, the tip of the engagement flange of the six male threaded members is engaged from below with the wedge-shaped convex cross section of the corresponding wedge member, and the upper and middle hollow pole members are connected to the male thread. When the member and the wedge member are raised together and the hollow pole is contracted, the tip of the flange of the six externally threaded members that has descended due to the rotation of the lower inner cylindrical member and the intermediate inner cylindrical member touches the corresponding wedge member. The wedge member is engaged with the engaging inward convex portion from above, and is configured to disengage the wedge member from the tapered lower end portions of the upper and intermediate hollow pole members.
The main feature is a pneumatic R lowering type hollow pole.

Function: According to the pneumatic lifting type hollow pole of the first invention, when the hollow pole is extended, compressed air is introduced into the lower hollow pole member and the upper hollow pole member from the compressed air port of the lower hollow pole member. The upper hollow pole member, the male threaded member threaded onto the female thread of the upper pole member, and the wedge member whose wedge-shaped convex portion is engaged with the engaging flange of the male threaded member are raised together.

Then, when the lower end of the upper hollow pole member reaches the required height to the upper end of the lower hollow pole member, the compressed air in both hollow pole members is removed.
The upper hollow pole member is slightly lowered and its tapered lower end engages the tapered surface of the wedge member that is in close contact with the inner surface of the lower hollow pole member, so that the upper hollow pole member is moved through the wedge member. It is adapted to be supported by the lower hollow pole member. In this case, since the wedge member has an occluded circular shape and has elasticity, it is in close contact with the inner surface of the lower hollow pole member on the outside of the male threaded member, and does not fall downward under its own weight. The tapered lower end of the upper hollow pole member and the taper of the wedge member are designed to increase the frictional force of the wedge member against the inner surface of the pole member against the load of the hollow pole member on the upper side of the wedge member. By setting the angle, the hollow pole member etc. can be reliably supported by the wedge member.

When the hollow pole is contracted, compressed air is again introduced into both the upper and lower hollow pole members, and the lower inner cylindrical member is rotated to lower the male threaded member, and the tip of the flange is wedged. The wedge member is engaged with the engagement inward convex portion of the member and is lowered together with the male member, whereby the tapered lower end of the upper hollow pole member and the tapered surface of the wedge member are engaged with each other. When the upper hollow pole member is released and the lock is released, and the compressed air is gradually removed in this state, the upper hollow pole member is lowered together with the external thread member and the wedge member.

Note that when the lower end of the upper hollow pole member reaches the upper end of the lower hollow pole member, the key provided on the former hits the inwardly protruding stopper of the latter, so that the upper hollow pole member reaches the upper end of the lower hollow pole member. There is no risk of it slipping further upwards.

Further, the pneumatic lifting type hollow pole of the second invention is obtained by further connecting at least one intermediate hollow pole member to the pneumatic lifting type hollow pole of the first invention, and this intermediate hollow pole member is connected to the upper hollow pole. It goes up and down in exactly the same way as the members.

That is, when the hollow pole is extended, compressed air is introduced from the compressed air port of the lower hollow pole member into the lower hollow pole member, the intermediate hollow pole member, and the upper hollow pole member, so that the upper hollow pole member and ,
A group of an upper male thread member screwed to the female thread of the upper wedge member and an upper wedge member engaged to the flange of the upper male thread member, an intermediate hollow pole member, and an intermediate male thread member screwed to the female thread of the upper wedge member; The group with the intermediate wedge member engaged with the flange of the intermediate male screw member is raised together. Then, when the lower ends of the upper hollow pole member and the intermediate hollow pole member each reach the required height to the upper end of the hollow pole member one level below, the compressed air in all the hollow pole members is exhausted. By being removed, the upper hollow pole member and the intermediate hollow pole member are slightly lowered, and the tapered lower ends thereof engage the tapered surface of the wedge member that is in close contact with the inner surface of the hollow pole member located one step below. Together, the upper hollow pole member and the intermediate hollow pole member are supported by the hollow pole member one step below via the wedge member.

Furthermore, when the hollow pole is contracted, with compressed air introduced into all the hollow pole members again, the lower inner cylinder member and the intermediate inner cylinder member are rotated together, thereby lowering the six male threaded members. The distal end of the flange engages with the engaging inward protrusion of the wedge member, and the wedge member is lowered together with the externally threaded member.
The tapered lower end of the upper hollow pole member and the tapered lower end of the intermediate hollow pole member are disengaged from the taper of each wedge member, and the lock is released, and in this state compressed air is gradually removed. This allows the upper hollow pole member and the intermediate hollow pole member to be lowered together with the external thread member and the wedge member, respectively.

Example Next, embodiments of the invention will be described based on the drawings.

The pneumatic lifting type hollow pole (1) according to the present invention includes an upper hollow pole member (11) and a lower hollow pole member (21).
Two intermediate hollow pole members (31) are interposed between them. These hollow pole members (11) (
21) (31) are made of aluminum, each having a circular cross section, and the cross section of the lower part is larger than that of the upper part.

The lower hollow pole member (21) is installed in an upright manner on the base (2), and has a tapered lower end (3G).
a lower intermediate hollow pole member (316) having a lower intermediate hollow pole member (316) is slidably and non-rotatably fitted into the lower intermediate hollow pole member (316), and an upper intermediate hollow pole member (316) having a tapered lower end portion (36); 31A) is slidably and non-rotatably fitted into the upper intermediate hollow pole member (31A), and an upper hollow pole member (11) having a tapered lower end (36) is slidably and non-rotatably fitted into the upper intermediate hollow pole member (31A). It's embedded.

A key groove (not shown) extending in the vertical direction is provided on one inner surface of the peripheral wall of the lower hollow pole member (21). In addition, an inwardly protruding stopper (
(not shown), a synthetic resin sliding member (10) is provided inside the upper end of the peripheral wall other than the keyway and the stopper, and a compressed air port (23) is provided in the lower part of the peripheral wall.

A top wall (14) is provided at the upper end of the upper hollow pole member (11), and a female thread 15) is provided inside the lower end of the peripheral wall of the pole member (11).

Pair of upper and lower intermediate hollow pole members (31A) (316)
There are grooves (3 grooves) extending vertically on the inner surface of one side of the peripheral wall.
9) is provided. Furthermore, an inwardly protruding stopper (27) is provided inside the keyway (39) at the upper end of the peripheral wall, and the keyway (39) and stopper (27) are provided inside the keyway (39).
A synthetic resin sliding member (10
) is installed inside, and a female thread (35) is provided inside the lower end of the peripheral wall of the pole member (31A) (316).

Although the illustration of the key groove and the inwardly protruding stopper on the peripheral wall of the lower hollow pole member (21) is omitted, these are the key grooves (39) on the peripheral wall of the intermediate hollow pole member (31A) (316) and the inner protruding stopper. It is formed in exactly the same way as the horizontally protruding stopper (27).

Keys (18) (38) (38) are provided on the outer side of the lower end of the peripheral wall of the upper hollow pole member (11) and the intermediate hollow pole member (31A) (316), respectively,
Each key (16) (38) (38) is a key groove (39) (39) provided in the vertical direction on the inner surface of the peripheral wall of the hollow pole member (31^) (316) (21) one step below.
), and each hollow pole member (1
1) (31A) (316) is slidably but non-rotatably fitted into the hollow pole member (31A) (316) (21) one step below.

At the center of the lower hollow pole member (21), a lower inner cylinder member (41) having a keyway (42) over almost the entire length is rotatably arranged, and at the lower end of the lower inner cylinder member (41), A vertical drive shaft (3) supported by the base (2) is connected via a bearing (4). This drive shaft (3)
At the lower end of the horizontal bevel gear (rotational driving force transmission means) (5)
is attached, and this bevel gear (5) is a vertical bevel gear (6)
vertical bevel gears (
The horizontal axis (7) of 6) passes through the side wall of the base (2),
A handle (rotational drive means) (8) is attached to its outer end.

Further, an intermediate inner cylinder member (43A) having a key groove (44) that matches the key groove (42) of the lower inner cylinder member (41) over almost the entire length in the center of each intermediate hollow pole member (31A) (316). (436) are arranged rotatably, and the lower intermediate inner cylinder member (436) is connected to the lower inner cylinder part 4 (436).
4I), and the lower intermediate inner cylinder member (43A) is connected to the lower intermediate inner cylinder member (436) with keyways (42) (44), respectively.
) are slidably fitted over each other so that they match each other.

At the lower end of the lower intermediate inner cylindrical member (416), a key (53) having a male thread (52) on the outer circumferential surface and fitting into the keyway (42) of the lower inner cylindrical member (41) on the inner circumferential surface. An intermediate male threaded member (51) having the following is fixed in a fitted manner, and this intermediate male threaded member (51) is attached to the lower intermediate hollow pole member (316).
It is screwed onto the female thread (35) at the lower end from below.

Also, a flange (54) is provided at the lower end of this intermediate male threaded member (51).
is provided, and the flange (5) of this male threaded member (51)
4), an intermediate wedge member (61) which has a resilient force and is circular in shape when viewed from above is arranged along the inner surface of the lower hollow pole member (21).

This intermediate wedge member (C1) is a lower intermediate hollow pole member (
A wedge-shaped convex portion (62) in cross section having a tapered surface (63〉) that fits into the tapered lower end portion (36) of The distal end of the flange (54) of the intermediate male threaded member (51) is connected to both the upper and lower convex portions (62) (65) of the intermediate wedge member (61). It is located between.

Further, an intermediate male threaded member (51) having the same configuration as above is fitted and fixed to the lower end of the upper intermediate inner cylinder member (41A), and this intermediate male threaded member (51) is attached to the lower end of the upper intermediate hollow pole member (31A). The flange (51) of the intermediate male threaded member (51) is screwed from below to the female thread 35) of the intermediate male threaded member (51).
54), an intermediate wedge member (61) having the same configuration as above.
are arranged along the inner surface of the lower intermediate hollow pole member (31J3).

The internal thread (1) inside the lower end of the upper hollow pole member (11)
5), an upper male threaded member (51) having the same configuration as the intermediate male threaded member (51) is screwed into the upper intermediate male threaded member (51), and this upper male threaded member (51) is fitted onto the upper intermediate inner cylindrical member (41A) so as to be slidable up and down. At the same time, an upper wedge member (61) having the same structure as above is provided on the outside of the flange (54) of the upper male threaded member (51).
It is arranged along the inner surface of A).

In the pneumatic lifting type hollow pole (1), when it is in its most contracted state, as shown in Figures 1 and 3,
Lower hollow pole member (2■), lower middle 1111 hollow pole member (316), upper middle hollow pole member (31A
) and the upper hollow pole member (11) are stacked one on top of the other in order from the outside to the inside, and the lower inner cylinder member (4), the lower intermediate inner cylinder member (436), and the upper intermediate inner cylinder member (4)
3A) are stacked one on top of the other in order from the inside to the outside.

In this state, it is extremely easy to replace the light bulb attached to the top of the hollow pole (1), set up the television camera, etc.

And after finishing the work, to extend the hollow pole (1),
Compressed air is introduced into both the upper and lower hollow pole members (II) (21) and the intermediate hollow pole member (31A) (316) through the compressed air port (23) of the lower hollow pole member (21). As a result, the upper hollow pole member (11), the upper male threaded member (51) screwed onto the female thread (15) thereof, and the tip of the flange (54) of the upper male threaded member (51) engage from below. The group with the mated upper wedge member (81) as well as the intermediate hollow pole member (31^) (31
6), an intermediate male threaded member (5I) screwed together with these female threads (35), and an intermediate wedge member (6I) in which the tip of the flange (54) of the intermediate male threaded member (51) is engaged from below. and groups are made to rise together.

The lower ends of the upper hollow pole member (11) and the intermediate hollow pole members (31A) (3), B are located one step lower than the hollow pole member (31A) (316).
) (21) When the required height to the upper end of the hollow pole members (11) (31^) (316
) (21) is removed, the upper hollow pole member (11) and the intermediate hollow pole member (
31^) (316) are slightly lowered to form wedges whose tapered lower ends (16) (36) are in close contact with the inner surfaces of the hollow pole members (31A) (316) (21) one step below. Engaged with the tapered surface of the shrine (61),
As shown in FIGS. 2 and 4 and 5 and 6, the upper hollow pole member (11) and the intermediate hollow pole member (
31^) (316) are supported by the hollow pole member (31A) (316) (21) one step below via the wedge member (61).

Note that when the lower ends of the upper hollow pole member (11) and the intermediate hollow pole members (31A) (316) reach the upper ends of the hollow pole members (31A) (316) (21) one step below, The key provided on the former (lit
) (36) and (38) are the latter inwardly protruding stoppers (27
), the valley hollow pole member (11) (31A
) (316) is the hollow pole member (31A) one step below.
(316) There is no risk of it coming off in the -L direction from the upper end of (21).

In addition, when the hollow pole (1) is contracted, when the handle (8) is rotated with compressed air introduced into all the hollow pole parts again, the horizontal shaft (7) and the two bevel gears (5) [i) and the lower inner cylinder member (41) and the intermediate inner cylinder member (43A) (
436) are rotated together, and thereby the 6 male threaded member (51) is lowered, and its flange (54)
is engaged with the engaging inward convex portion (65) of the wedge member (61) from above, and the wedge member (61) is connected to the externally threaded member (65).
51), and the upper hollow pole member (
11), the tapered lower end (16), the tapered surface (63) of the wedge member (B1), and the intermediate hollow pole member (31A).
The tapered lower end (36) of (316) and each wedge member (6
1) is disengaged from the tapered surface (63),
The lock will be released. By gradually removing the compressed air in this state, the upper hollow pole member (11) and the intermediate hollow pole members (31A) (316) are lowered together with the male screw member (51) and the wedge member (61), respectively. The lower intermediate hollow pole member (316) is inserted into the lower intermediate hollow pole member (21), and the upper intermediate hollow pole member (31A) is inserted into the lower intermediate hollow pole member (316).
Further, the upper hollow pole members (11) are respectively accommodated within the upper intermediate hollow pole members (31A), and the hollow poles (1) return to the most retracted state shown in FIGS. 1 and 3.

The vertical drive shaft (3) is normally rotated manually using a handle, but in some cases it may also be rotated electrically using a specific tool.

For example, when a lighting device, a television camera, etc. is attached to the top of the hollow pole (1), electric wires (not shown) etc. are installed inside the hollow pole (1).
There is a winder (not shown) that is linked to the rotation of the handle (8).
By equipping the hollow pole members (11) (31
A) As the wire (316) rises, the electric wires are fed out into the hollow pole (1) one after another, and the hollow pole member (1
1) (31A) It is preferable to wind up the electric wire as (316) descends.

Further, in the hollow pole (1), hollow pole members (11) (31A), (31A) (31
Gaskets (9) are interposed at the connecting portions of (6), (316) and (21), respectively, to prevent rainwater from entering into the hollow pole (1).

Although not shown, the upper intermediate hollow pole member (3
1A), the inner surface of the lower intermediate hollow pole member (316), and the inner surface of the lower hollow pole member (21), respectively. By making the heights different from each other, for example, decreasing the height from the bottom, the lower intermediate hollow pole member (316) is first rotated by the first rotation of the handle (8) when the hollow pole (1) is contracted. The lock is released by disengaging the tapered lower end (36) from the tapered surface (63) of the wedge member (61), and in this state compressed air is gradually removed, thereby opening the lower intermediate hollow. Pole members (
316) and reintroducing compressed air at a predetermined pressure into the hollow pole (1) that has been lowered by one stage, the upper intermediate hollow pole member (31A) is now turned by the second rotation of the handle (8). ) by disengaging the tapered lower end (36) of the wedge member (61) from the tapered surface (G3) to release the lock, and then repeating the same operation to move all the hollow pole members to one level. Lower the hollow pole (
It is also possible to reduce 1).

In addition, in the above embodiment, the upper hollow pole member (1
Although two intermediate hollow pole members (31) are interposed between the lower hollow pole member (21) and the lower hollow pole member (21), it is sufficient that at least one intermediate hollow pole member (31) is interposed. In some cases, intermediate hollow pole members (
31) may be omitted altogether.

Here, in the case where the hollow pole (1) is composed only of the upper hollow pole member (11) and the lower hollow pole member (21>) without using the intermediate hollow pole member (31), the illustration is omitted, but A male screw member (51) slidably fitted onto a rotatable lower inner cylinder member (41) at the center of the lower hollow pole member (21) is connected to a female screw (15) at the lower end of the upper hollow pole member (11). They are directly screwed together, so there is no need to use the intermediate inner cylindrical member (43).In addition, on the outside of this male threaded member (5I), from a plane having elasticity along the inner surface of the lower hollow pole member (21), The arrangement of the wedge member (61) having a notched circular shape is exactly the same as in the above embodiment.

The pneumatic lifting type hollow pole (+,) according to the present invention can be used by attaching not only lighting equipment and television cameras but also other items such as road signs to the top of the upper hollow pole member (11). Of course there is.

Effects of the Invention As described above, the pneumatic lifting type hollow pole according to the first invention includes a lower hollow pole member installed in an upright manner on a base, and a tapered lower end that is slidably fitted into the lower hollow pole member. an upper hollow pole member having a section;
a lower inner cylindrical member rotatably disposed in the center of the lower hollow pole member; a male threaded member slidably fitted over the inner cylindrical member and having an engagement flange at its lower end; a wedge member arranged along the inner surface of the lower hollow pole member and having a resiliency and having an occluded circular shape when viewed from a plane; a top wall is provided at the upper end of the upper hollow pole member; and a top wall is provided at the upper end of the upper hollow pole member; is provided with a female thread, a male thread member is screwed into the female thread, an inwardly protruding stopper is provided at the upper end of the circumferential wall of the lower hollow pole member, a compressed air port is provided at the lower part of the circumferential wall, and the wedge member is provided at the inner side. A wedge-shaped convex section having a tapered surface that fits into the tapered lower end of the upper hollow pole member, and an engaging inward convex section provided below this through a hanging wall of a required height. When the hollow pole is extended, the tip of the engagement flange of the externally threaded member is positioned between both convex portions of the wedge member, and compressed air is introduced into both the upper and lower hollow pole members. The tip of the flange is engaged from below with the wedge-shaped convex cross section of the wedge member, and the upper hollow pole member, male thread member, and wedge member are raised together, and when the hollow pole is contracted, the lower inner cylinder The tip of the flange of the male threaded member that has descended due to the rotation of the member is engaged from above with the engagement inward protrusion of the wedge member, and the wedge member is disengaged from the tapered lower end of the upper hollow pole member. This is how it is done.

Further, a second invention of the present invention is that in order to further increase the length of the pneumatic lifting type hollow pole of the first invention, an intermediate hollow pole member is connected, and an upper hollow pole member and a lower hollow pole are connected. At least one slidable intermediate hollow pole member having a tapered lower end portion, an intermediate inner cylindrical member rotatably disposed at the center of each intermediate hollow pole member, and each intermediate hollow pole member between the members. an intermediate male threaded member screwed into the female thread on the inside of the lower end, fixed to the lower end of the intermediate inner cylindrical member, and having an engaging flange at the lower end; An intermediate wedge member having a notched circular shape when viewed from a plane disposed along the inner surface of the lower inner cylindrical member or the intermediate inner cylindrical member is interposed, and the intermediate wedge member has the tapered lower end of the upper hollow pole member or A wedge-shaped cross-sectional convex portion having a tapered surface that fits into the tapered lower end of the intermediate hollow pole member one step above, and an engaging inward convex portion provided below the convex portion via a hanging wall of a required height. Consisting of:
The tip of the engagement flange of the intermediate male threaded member is positioned between both convex portions of the intermediate wedge member, thereby creating a hollow space in which compressed air is introduced into the two lower hollow pole members and the intermediate hollow pole member. When the pole is extended, the tip of the engagement flange of each male threaded member is engaged from below with the wedge-shaped convex cross section of the corresponding wedge member, and the upper and middle hollow pole members, the male threaded member, and the wedge member are connected to each other. are raised together, and when the hollow pole is contracted, the tips of the flanges of the male threaded members that have descended due to the rotation of the lower inner cylindrical member and the intermediate inner cylindrical member engage the engaging inward convexity of the corresponding wedge member. The wedge member is disengaged from the tapered lower end portions of the upper and intermediate hollow pole members.

So, in any of the above cases, according to the pneumatic lowering type hollow pole of the present invention, the pole member can be raised and lowered by air pressure without using the conventional screw feeding mechanism, and therefore the pole member can be raised and lowered. The lowering speed is very fast, and the pole member can be reliably locked (stopped) at the desired height, so the overall length of the pole can be freely set to any desired length. The lock can be reliably released by a simple short screw feed mechanism.

Therefore, for example, when a television camera is attached to the top of a hollow pole, it is possible to take pictures from a desired height by remote control, and even when a lighting device is attached to the top of a hollow pole, the pole can be tilted sideways. This makes it extremely easy to perform tasks such as replacing light bulbs. Furthermore, according to the pneumatic lifting type hollow pole of the present invention, there is no restriction on the installation location, and the pole lifting mechanism is not visible from the outside, so the appearance is very beautiful.

In particular, according to the second invention, four or more pole members can be freely connected, resulting in a very convenient effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of the hollow pole in a contracted state, FIG. 2 is a partially omitted vertical cross-sectional view of the hollow pole in an extended state, and FIG. FIG. 4 is a schematic vertical cross-sectional view of the hollow pole in a contracted state, FIG. 5 is an enlarged vertical cross-sectional view of the main part of FIG. 1, and FIG. Figure 5 is an enlarged sectional view taken along the line ■-■, Figure 7 is an enlarged sectional view taken along the line ■-■ in Figure 5,
FIG. 8 is an enlarged sectional view taken along the line ■--■ in FIG. 5, and FIG. 9 is an enlarged partially cutaway perspective view of the main part of the connecting portion between the upper and lower intermediate hollow pole members. (1)...Pneumatic lifting hollow pole, (2)...Base, (3)...Rotation drive shaft, (11)...Upper hollow pole member, (14)...Top wall, (I5>...Female thread, (16)...Tapered lower end, (18)...Key (21)...Lower hollow pole member, (23)...
Compressed air introduction hole, (27)...inward protruding stopper, (
31) (31A) (316)...Middle hollow pole member, (35)...Female thread, (36)...Tapered lower end, (38)...Ki (39>...Keyway) , (41
)...Lower inner cylinder member, (42)...Key groove, (43
) (43A) (436)...Intermediate inner cylinder member, (4
4)...Keyway, (51)...Male thread member, (52
)...Male thread, (53)...Key (54)...
Flange part, (61)...Wedge member, (62)...Wedge-shaped cross section convex part, (63)...Tapered surface, (64)...Descent wall, (65)...Inner part for engagement Convex part. that's all

Claims (2)

[Claims] (1) A lower hollow pole member (21) installed in an upright manner on the base (2), and an upper hollow pole member (11) slidably fitted into the pole member (21) and having a tapered lower end (16). , a lower inner cylindrical member (41) rotatably disposed in the center of the lower hollow pole member (21), and an engaging flange (54) slidably fitted over the inner cylindrical member (41) and at the lower end. ) with a male threaded member (51)
and a wedge member (61) which is arranged along the inner surface of the lower hollow pole member (21) on the outside of the male threaded member (51) and has an elastic force and has an occluded circular shape when viewed from the plane. Top wall (14) at the upper end of member (11)
A female thread (15) is provided inside the lower end of the pole member (11), a male thread member (51) is screwed into this female thread (15), and the lower hollow pole member (21
) is provided with an inwardly protruding stopper (27) at the upper end of the peripheral wall, and a compressed air port (23) is provided at the lower part of the peripheral wall, and the wedge member (61) has a taper of the upper hollow pole member (11) on the inside. Tapered surface (63) that fits with the lower end (16)
It consists of a wedge-shaped convex portion (82) in cross section, and an engaging inward convex portion (65) provided below this via a hanging wall (64) of a required height, and the wedge member (61 ) The tip of the engagement flange (54) of the male threaded member (51) is positioned between the convex parts (62) and (65) of the upper and lower hollow pole members (11) and (21). When the hollow pole into which compressed air is introduced is expanded, the tip of the collar (54) engages with the wedge-shaped convex section (62) of the wedge member (61) from below, and the upper hollow pole member ( 11), the male threaded member (51), and the wedge member (61) are raised together, and when the hollow pole is contracted, the lower inner cylinder member (41)
The flange (54) of the male threaded member (51) descends due to the rotation of
) is engaged from above with the engaging inward protrusion (65) of the wedge member (61), and the wedge member (81) and the tapered lower end (16) of the upper hollow pole member (11) A pneumatically lifted hollow pole that is adapted to be disengaged. (2) At least one slidable intermediate hollow pole member (3) having a tapered lower end (38) is disposed between the upper hollow pole member (11) and the lower hollow pole member (21).
1), the intermediate inner cylinder member (43) rotatably arranged at the center of each intermediate hollow pole member (31), and the internal thread (35) inside the lower end of each intermediate hollow pole member (31). an intermediate male threaded member (51) fixed to the lower end of the intermediate inner cylinder member (43) and having an engaging flange (54) at the lower end; An intermediate wedge member (61), which is circular when viewed from the plane and arranged along the inner surface of the lower lower inner cylinder member (41) or the intermediate inner cylinder member (43), is interposed. ) is the tapered lower end (16) of the upper hollow pole member (11) or the tapered lower end (3) of the intermediate hollow pole member (31) one step above.
A wedge-shaped convex section (62) having a tapered surface (63) that fits into the convex part (62), and a hanging wall (64) of the required height below this convex part (62).
) and an engaging inward convex portion (65) provided through the intermediate wedge member (61), and both convex portions (62) (65
) The engagement flange (5) of the intermediate male threaded member (51)
4), the upper and lower hollow pole members (11) (21) and the intermediate hollow pole member (31) are positioned.
When a hollow pole into which compressed air is introduced is extended,
The tip of the engagement flange (54) of each male threaded member (51) corresponds to the wedge-shaped cross-section convexity (62) of the corresponding wedge member (61).
) from below, and the upper and middle hollow pole members (11) (31), the male threaded member (51), and the wedge member (
61) are raised together, and when the hollow pole is contracted, the lower inner cylinder member (41) and the intermediate inner cylinder member (41) are raised together.
The tip of the flange (54) of each male threaded member (51) that has descended due to the rotation of (43) is engaged from above with the engaging inward protrusion (65) of the corresponding wedge member (61), Wedge member (61) and upper and middle hollow pole members (11) (
2. A pneumatically lifting hollow pole according to claim 1, wherein the pneumatically lifting hollow pole is adapted to be disengageable from the tapered lower end portion (16) (36) of the pole (31).