JPS5918233Y2 - telescopic tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a telescoping tube used for a tripod pedestal, etc.

In general, this type of telescopic tube has tube bodies of different diameters slidably inserted into each other, and a fixing mechanism is provided at the end of the larger diameter tube, that is, the outer tube. Configured to secure the tube.

By the way, in such a telescopic tube, there is a problem that the inner tube swings relative to the outer tube due to the gap between the outer tube and the inner tube, and it is preferable to minimize such swinging of the inner tube. .

In order to reduce such swinging, it is possible to tightly fit the inner tube into the outer tube or the main body of the fixing mechanism, but this will reduce the effects of dimensional errors and bending of the inner tube. This causes problems such as smooth expansion and contraction.

In order to prevent such defects, the precision of each component must be increased, resulting in an extremely high cost.

The present invention was developed based on the above circumstances, and its purpose is to reduce the swinging of the inner tube with respect to the outer tube, to expand and contract smoothly, and to reduce costs. The goal is to obtain a flexible tube.

The present invention will be explained below according to an embodiment shown in the drawings.

In this embodiment, the telescoping tube of the present invention is used as a leg post of a camera tripod.

Reference numeral 1 in the figure is the base, and three pillars 2 are pivotally attached to the base 1.

In addition, 3... are stays, and these stays 3.
Each pedestal 2... is configured such that its expansion angle is regulated by....

In addition, 4 is an elevator rod, 5 is a bundle for raising and lowering the elevator rod 4, 6 is a pan head, and 7 is a bread stick.

These pillars 2... each have three tube bodies 8a..., 8b... 8C'! When the tubes 8a..., 8b... are telescopically inserted,
.

A fixing mechanism 9... is provided at the end of each tube 8C... so that the inner tubular bodies 8b..., 8C... can be fixed at any desired position.

These fixing mechanisms 9... have the same structure except that the dimensions differ for each stage, and the structure of one set of fixing mechanisms 9 and tube bodies 8a, 8b will be described below.

These tubes 8a and 8b are extruded from aluminum and have a relatively thin wall and a substantially rectangular cross section.

Two guide grooves 10 are formed along the axial direction on two opposing side surfaces of these tubular bodies 8a and 8b, respectively.

These guide grooves 10... are formed by recessing the peripheral walls of the tubular bodies 8a, 8b, and these guide grooves 10...
・The inner surface corresponding to the ridge is bulged out in the shape of a ridge.

The inner tube 8b with a smaller diameter (hereinafter referred to as the inner tube) is swingably fitted into the outer tube 8a with a larger diameter (hereinafter referred to as the outer tube), and the outer surface of the inner tube 8b and the outer A predetermined gap is formed between the tube 8a and the inner surface of the tube 8a.

The fixing mechanism 9 is provided at the end of the outer tube 8a.

11 is a main body of this fixing mechanism 9, and this main body 11 is formed of a synthetic resin material.

The main body 11 is fitted along the axial direction (L12
is formed, and the distal end portion of the outer tube 8a is tightly fitted into the fitting hole 12.

Further, a flange 13 is formed on the inner surface of the distal end of the fitting hole 12, and the distal end surface of the outer tube 8a abuts against the flange 13 to restrict the fitting position of the main body 11.

A pair of ears 14, 14 spaced apart from each other in the axial direction protrude from one side surface of the main body 11 corresponding to one side surface on which the guide grooves 10... of the outer tube 8a are formed. It is set up.

A pressing member accommodating hole 15 is formed between these ear portions 14, 14 so as to be perpendicular to the axial direction.

Further, a hole 16 is formed in one side of the outer tube 8a in correspondence with the pressing member housing hole 15.

A pressing member 17 is housed in this pressing member housing hole 15 .

The pressing member 17 is configured to slide within the pressing member housing hole 15, pass through the extraction hole 16 of the outer tube 8a, and have one side thereof abut against one side of the inner tube 8b.

One side of this pressing member 17 has a protrusion 18°18 that is in close contact with the outer periphery of one side of the inner tube 8b and fits into a guide groove 10.10 formed on one side of this inner tube 8b.
is formed.

Further, a cam lever member 19 is provided between the ear portions 14 and 14 of the main body 11, and this cam lever member 19 is connected to the ear portion 14.
4. Pin 20 provided along the axial direction through 14
It is pivotally mounted to be rotatable in a direction perpendicular to the axial direction.

A cam surface 2 is provided at the tip of this cam lever member 19.
1 is formed, and when the tip of this cam lever member 19 is rotated so as to approach the main body 11, this cam surface 21 presses the above-mentioned pressing member 17, and this pressing member 17
is pressed against the outer periphery of one side of the inner tube 8b to fix the inner tube 8b in a non-slidable manner.

A leaf spring 22, an abutment plate 23, and a shim plate 24 are interposed between the cam surface 21 of the cam lever member 19 and the other side surface of the pressing member 17.

The leaf spring 22 is curved in an arc shape in a free state,
Its both ends are in sliding contact with the other side surface of the pressing member 17, and its center part is in contact with the abutting plate 23.

The leaf spring 22 always urges the pressing member 17 and the contact plate 23 apart, and when the cam lever member 19 is rotated to release the pressing force, the pressing member 17 is The inner tube 8b side is biased, and the contact plate 2
3 and the shim plate 24 are urged toward the cam lever member 19 so that these members do not move freely.

Further, a leaf spring accommodating recess 25 is formed in the center of the other side surface of the pressing member 17 .

The leaf spring 22 is housed in the leaf spring accommodating recess 25, and when the cam lever member 19 is rotated to press the pressing member 17, the leaf spring 22 is compressed flat and becomes a leaf spring. It is completely housed in the accommodation recess 25 and is configured such that the contact plate 23 directly contacts the peripheral edge of the other side of the pressing member 17 to press the pressing member 17 .

Further, a positioning protrusion 26 is formed in the leaf spring accommodating recess 25, and both ends of the positioning protrusion 26 abut against the inner surfaces of both ends of the leaf spring 22 to position the leaf spring 22. It is configured as follows.

The contact plate 23 is formed from a relatively thick metal plate and has relatively high rigidity, and when pressed by the cam lever member 19, the pressing force is transferred to the other side of the pressing member 17. It is configured to act uniformly on the entire peripheral edge of the.

Further, the shim plate 24 is prepared in various thicknesses, and is selectively inserted so as to absorb dimensional errors of each member during assembly.
This is to adjust the pressing force etc. of 7 to be constant.

Further, a guide portion 27 is integrally formed in a portion of the flange portion 13 of the main body 11 that faces the pressing member 17.

This guide portion 27 is configured to be in close contact with the other side surface of the inner tube 8b, that is, the surface opposite to the one side surface that the above-mentioned pressing member 17 comes into contact with, and is located within the guide grooves 10, 10 formed on the other side surface. A protrusion 28.28 is formed which fits tightly into the holder.

Further, a pair of mutually opposing punch holes 4 and 29 are formed on one side and the other side of the proximal end of the inner tube 8b.

Stopper members 30, 30 made of a synthetic resin material are fitted into these holes 29, 29, respectively.

The distal ends of these stopper members 30, 30 protrude from the holes 29, 29, and their distal surfaces are in close contact with the inner surface of the outer tube 8a.

Further, flanges 31... are provided protrudingly on both sides of the tip portions of these stopper members 30, 30, and these flanges 31...
... is the peripheral edge of the extraction holes 29, 29 of the inner tube 8b and the outer tube 8
interposed between the inner surface of the inner tube 8b and the outer tube 8a.
It is configured to maintain a gap between the

A compression spring 32 is interposed between these stopper members 30.30, and the biasing force of the compression spring 32 biases the distal end surface of the stopper member 30.30 into pressure contact with the inner surface of the outer tube 8a. , prevents rattling.

The side surface of the tip end of one of these stopper members 30.30 is configured to come into contact with the end face of the above-mentioned pressing member 17 to prevent the inner tube 8b from being pulled out. The side surface of the tip end and the end surface of the pressing member 17 are inclined so that when they come into contact with each other, they engage with each other and securely prevent removal.

In one embodiment of the present invention constructed as described above, when the cam lever member 19 is rotated away from the main body 11 as shown in FIGS. 3 and 4, the pressure of the pressing member 17 is released and the inner tube 8b is Becomes expandable and contractable.

In this case, since the pressing member 17 is pressed against one side of the inner tube 8b by the leaf spring 22, this inner tube 8b
The other side surface b is in close contact with the guide portion 27 of the main body 11.

Therefore, the inner tube 8b is pressed between the pressing member 17 and the guide portion 27 and is tightly fitted to the main body 11, so that the inner tube 8b is prevented from swinging and is guided reliably.

Further, guide grooves 10 are formed on one side and the other side of the inner tube 8b, and a pressing member 17 and a guide portion 2 are formed.
7 has protrusions 18 that fit into these guide grooves 10.
18.28.28, the inner tube 8b is guided more reliably.

Further, when the cam lever member 19 is rotated so as to approach the main body 11 as shown in FIGS. 7 and 8, the abutment plate 23 is pressed by the cam surface 21, and the leaf spring 22 is compressed. 23 comes into contact with the peripheral edge of the other side of the pressing member 17, and the pressing member 17 is pressed against the inner tube 8b, so that the inner tube 8b
is fixed.

In this case as well, the inner tube 8b is connected to the pressing member 17 and the guide portion 2.
7, this inner tube 8b is securely fixed.

Note that the present invention is not limited to the above-described embodiment; for example, it is not necessary to include a leaf spring in the mechanism for pressing the pressing member.

Even in such a case, the pressing member is usually constructed so that it can slide freely and come into close contact with the inner tube even when the cam lever member is released from the pressing state, so the pressing member and the guide section can securely hold the inner tube. can be guided.

Further, the detailed structure of the mechanism for pressing the pressing member is not necessarily limited to the above.

Furthermore, the arrangement and configuration of the guide portion are not necessarily limited to those described above; in short, the guide portion should be in close contact with the outer circumferential surface of the inner tube on the opposite side of the pressing member and fit into the guide protrusion or groove. It is sufficient if the part is provided integrally with the main body of the fixing mechanism.

Further, the cross-sectional shapes of the inner tube and the outer tube are not necessarily limited to rectangular shapes, but may be of other shapes, and the guide grooves are not necessarily limited to this, but are axially continuous protrusions. may be provided.

Furthermore, the present invention is applicable not only to tripod pillars but also to telescopic tubes such as microphones and lighting equipment pillars.

As described above, the present invention has a main body of the fixing mechanism attached to the end of the outer tube, which is in close contact with the outer peripheral surface of the inner tube on the opposite side of the pressing member, and which fits into the guide protrusion or guide groove formed on the inner tube. The matching guide portion is integrally formed.

Therefore, the inner tube is held between the pressing member and the guide portion and is tightly fitted into the main body of the fixing mechanism.

Since the pressing member is generally manufactured and adjusted so as to be in close contact with the inner tube at all times, the tight fitting state of the inner tube is highly accurate, and the guide portion is integrated with the main body and is closely connected to the inner tube. Since the inner tube is fitted into the guide strip or guide groove formed in the inner tube, the inner tube is reliably guided and its rocking and rattling can be minimized.

In addition, since the pressing member and its pressing mechanism are originally configured to come into close contact with the inner tube with high precision, there is no need to finish other parts with high precision, and the cost is lower than with conventional structures. The effect is great without any rise.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall perspective view, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is a vertical sectional view of the main parts in the unlocked state, and Fig. 4 is Figure 5 is a cross-sectional view taken along the line IV-IV in Figure 3, Figure 5 is a view taken along the v-■ arrow in Figure 3, Figure 6 is a cross-sectional view taken along the line VI-VI in Figure 3, Figure 7 is a fixed view. A vertical cross-sectional view of the main part in the state, FIG. 8 is Ml-V in FIG. 7.
FIG. 2 is a sectional view taken along line II.

Claims (1)

[Scope of utility model registration request] an outer tube, an inner tube that is slidably inserted into the outer tube and has an axially continuous guide protrusion or guide groove formed on its outer circumferential surface, and a fixing mechanism attached to the end of the outer tube. a main body, a pressing member provided within the fixing mechanism and capable of moving toward and away from the outer circumferential surface of the inner tube; and a pressing member rotatably provided in the fixing mechanism main body and pressed against the pressing member by being rotated. A cam lever member that presses against the outer circumferential surface of the inner tube and presses and fixes the inner tube, and a cam lever member that is integrally provided in the fixing mechanism main body and abuts on the outer circumferential surface of the inner tube on the opposite side to the outer circumferential surface that the pressing member abuts. A telescoping tube characterized by comprising: a guide portion that fits into a guide protrusion or a guide groove formed on the outer circumferential surface of the expandable tube.