JP2592967Y2 - Telescopic bar - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic rod which can be used for various types of rods, columns, legs and the like and whose length can be adjusted very easily.

[0002]

2. Description of the Related Art Conventionally, for example, in a metal clothesline,
The thing which can expand and contract and can adjust length is widely known. This is because the inner pipe with a smaller diameter is inserted into the outer pipe with a larger diameter,
The entire length of the pipe is adjusted by taking in and out the inner pipe, and the inner pipe is usually fixed using screws or the like.

[0003]

[Problems to be solved by the invention] However, in the case of using a screw or the like, it is necessary to fix the inner pipe by rotating the outer pipe and the inner pipe relatively, or by rotating a fastener. The adjustment work becomes complicated.

The present invention solves such a problem, and is characterized by a telescopic rod whose length is adjusted by taking an inner pipe inserted into and out of an outer pipe, wherein the inner pipe is slidable. The female ring of the female ring is externally fitted, and the inner pipe through hole of the female ring comprises a sliding portion with which the inner pipe slides and a tapered portion with which the outer pipe end abuts, and a tapered portion with respect to this sliding portion. Is to be eccentric. Here, the cross-sectional shape of each pipe may be various polygons other than a circle or the like.

[0005]

Embodiments of the present invention will be described below. Embodiment 1 (Structure) FIG. 1A is a cross-sectional view of an embodiment of the present invention, and FIG. 1B is a cutaway perspective view. As shown, the telescopic rod is inserted into an outer pipe 1 and inserted therein. It comprises a substantially concentric inner pipe 2. The inner diameter of the outer pipe 1 is substantially equal to the outer diameter of the inner pipe 2, and the total length of the pipe can be changed by taking the inner pipe 2 in and out. The materials of these two pipes are not particularly limited, and those having sufficient strength may be used according to the use of the telescopic rod. In this example, an aluminum material was used. Also, inner pipe 2
A Duracon (trade name) ring 8 having an inner diameter of 13 mm was provided at one end of the outer pipe, and a Duracon ring 9 having an outer diameter of 14 mm was provided near one end of the inner pipe so that it did not come out of the outer pipe 1 when pulled out.

To adjust the length of such a pipe,
It is necessary to fix the drawn inner pipe 2 at an arbitrary position. In this embodiment, the fixing is performed by the male ring 3 and the female ring 4.

[0007] First, the male ring 3 is a cylindrical body fitted around the outer pipe 1 and fixed to the end of the pipe with screws 5, and has a tapered surface 6 on the outer periphery of the end.

On the other hand, the female ring 4 is slidably fitted to the inner pipe 2 and has a through hole 7 through which the inner pipe 2 passes. The through hole is formed of a tapered portion 7A that is engaged with the tapered surface of the male ring from one end to the center, and a sliding portion 7B that is slidably contacted with the inner pipe 2 from the center to the other end.
The female ring is externally fitted with this tapered portion facing the outer pipe end. Since the female ring 4 strongly presses the inner pipe 2 with the sliding portion 7B when fixing the inner pipe 2, stainless steel or the like is preferable as a material in consideration of wear resistance.

Here, the diameter of the sliding portion 7B is substantially equal to the outer diameter of the inner pipe, and the opening diameter of the tapered portion 7A is larger than the outer diameter of the end of the outer pipe, ie, the outer diameter of the male ring taper end.
As shown in FIG. 2, the sliding portion 7B of the through hole is formed concentric with the center axis of the female ring, and the tapered portion 7A is formed eccentric with the sliding portion 7B. Incidentally, in the present embodiment shown in FIG. 3, the taper angle of the taper angle theta ₁ female ring 4 of the male ring 3 theta ₂
Smaller than. However, the relationship between the taper angles is not particularly limited, and conversely, θ ₁ may be larger than θ ₂ .

With the above construction, the outer pipe 1, the inner pipe 2, the male ring 3 and the sliding portion 7B of the female ring through-hole are arranged substantially on the same axis, and the tapered portion 7A of the female ring through-hole is provided.
Only the eccentricity will be arranged.

(Usage Method) A method of using such a pipe will be described with reference to FIG. First, when the pipe is extended, the inner pipe 2 can be fixed by simply pulling out the required length and releasing the hand. For example, when the inner pipe 2 is pulled out upward, no force is applied to the female ring 4 to push it down, and the inner pipe 2 can be pulled out without any resistance.

On the other hand, if the drawn pipe is released, the inner pipe 2 attempts to return to the outer pipe 1 by its own weight, so that the female ring 4 is rubbed by friction between the outer peripheral surface of the inner pipe 2 and the through hole sliding portion 7B.
Is pressed downward, and the tapered portion 7A of the through hole is pressed against the tapered surface 6 of the male ring.

Here, since the tapered portion 7A and the sliding portion 7B of the female ring through-hole are eccentric, the male ring 3 presses the female ring 4 at the point A and gives a rotational force about the point B. .
At this time, points A, B, and C of the female ring 4 correspond to these force points, fulcrums, and action points, respectively.
This can be fixed because it is strongly pinched. Even when a compressive force acts in the pipe axial direction, the inner pipe 2 can be firmly fixed because the inner pipe 2 is more strongly pressed by the leverage principle.

From the above, as shown in FIG.
If the double value of the eccentricity δ is selected to be equal to or more than the amount of backlash based on the processing difference of each part, the rotational force can be reliably applied to the female ring 4 and the slip of the inner pipe 2 can be prevented. In the case of the present example, the eccentricity δ × 2> the difference between the diameter of the sliding portion and the outer diameter of the inner pipe + the difference between the inner diameter of the male ring taper side and the outer diameter of the inner pipe.

When the inner pipe 2 is accommodated in the outer pipe 1 and shortened, the female ring 4 is slightly lifted upward to engage the tapered portion 7A of the female ring through hole with the male ring tapered surface 6. You only need to release it. By this operation, the force pressing the inner pipe 2 is released, and the inner pipe 2 descends by its own weight and is stored in the outer pipe 1.

In the above example, a male ring having a tapered surface is provided at the end of the outer pipe. However, the male ring itself is not essential, as a matter of course. This is because if the end of the outer pipe abuts against the female ring taper, the above-mentioned action can be achieved. That is, in the above example, since the male ring is integrated with the outer pipe, it is described as an end of the outer pipe including the male ring.

(Specific application) As described above, the telescopic rod of the present invention can fix the inner pipe by the female ring against the compressive force in the axial direction, but can fix the inner pipe by the female ring through hole against the tensile force. The inner pipe cannot be fixed because the tapered portion cannot be pressed against the tapered surface of the male ring. Further, since the inner pipe and the outer pipe rotate independently of each other, the rotation operation cannot be transmitted. For this reason,
As specific applications, the following ones that do not exert a tensile force during use are suitable.

Handles, operation sticks Handles such as Takae scissors, fruit dropper, etc., operation sticks such as ceiling cleaning sticks, kite picking tools, etc. Legs of various furniture, pedestals, etc.

(Test Example 1) Actually, a test was performed to determine how much compression the elastic bar of the present invention can withstand. The telescopic bars used in the test are as follows. Outer pipe: Inner diameter 14mm, Outer diameter 16mm, made of aluminum alloy Inner pipe: Inner diameter 10mm, Outer diameter 13mm, made of aluminum alloy Male ring: Taper angle 41 ° 08 ', Aluminum alloy Female ring: Outer diameter 22mm, height 16mm, Sliding length 9mm Eccentricity 0.5mm, taper angle 46 ° 24 ', stainless steel

In the test, the inner pipe of the telescopic rod was pulled out for a predetermined length, and a compression force was applied in the axial direction to evaluate whether the inner pipe was returned into the outer pipe. As a result, the inner pipe and the female ring do not slip, and the inner pipe buckles about 30 minutes.
It was confirmed that it could withstand a compression force of as much as 0 kg.

Test Example 2 From the above test example, it was confirmed that the telescopic rod of the present invention can sufficiently withstand use of a column or the like. However, when such telescopic rod is mass-produced, the inner pipe and the female ring slip. However, it was found that a defect that the inner pipe could not be sufficiently fixed against the compression occurred at a rate of about 3%.

Therefore, a female ring (FIG. 4) in which the sliding portion of the through hole is also tapered at a slight angle (processed in a tapered shape from the boundary between the tapered portion and the sliding portion toward the opening of the sliding portion). ) And mass-produced telescopic bars using the same, and examined the defect rate. The telescopic rod used in the test had an angle θ _{3 of the} sliding portion with respect to the female ring center axis of 1 °, and the other configurations were the same as in Test Example 1.

As a result, the defect rate could be suppressed to almost 0%, and it was confirmed that it was extremely effective in improving the yield. The angle θ _{3 of the} sliding portion with respect to the female ring center axis is 1
~ 2 ° was preferred.

Embodiment 2 Next, both the outer pipe 1 and the inner pipe 2 have a hexagonal cross section.
A telescopic bar configured to transmit a rotational motion will be described. FIG. 5A is a cross-sectional view of the embodiment of the present invention, and FIG.

(Outer Pipe) First, the outer pipe 1 is made of aluminum having a regular hexagonal cross section.
Concave recess 10 recessed on the inner circumference side
Are formed. The recess 10 is for preventing the inner pipe 2 from coming off as described below.

(Inner Pipe) On the other hand, the inner pipe 2 is also made of aluminum having a regular hexagonal cross section, and is inserted into the outer pipe 1. Therefore, unlike the first embodiment, the rotational movement of the outer pipe 1 can be transmitted to the inner pipe 2. A hexagonal guide 11 that is inscribed in the outer pipe 1 is provided at the end of the inner pipe 2 so that the inner pipe 2 does not rattle when the inner pipe 2 is taken in and out. In addition, convex portions 12 protruding to the outer peripheral side are formed on two opposing surfaces of the six side surfaces, so that the inner pipe 2 does not come off by engaging with the concave portion 11 of the outer pipe when the inner pipe is pulled out ( FIG. 8A). Note that the cross-sectional shape of both the outer pipe 1 and the inner pipe 2 is not limited to a hexagon, but may be another polygon.

(Female Ring) In order to fix the inner pipe 2 at a predetermined drawing position, a female ring 4 and a male ring 3 corresponding to a hexagonal pipe are used. First, the female ring 4 is shown in FIGS.
As shown in (A), the outer shape is a flat cylindrical member, and the sliding portion 7B of the inner pipe through hole 7 is formed in a hexagonal shape corresponding to the outer shape of the inner pipe, and the tapered portion 7A is formed in a circular shape. And like Embodiment 1, the sliding portion 7B is concentric with the female ring itself,
The tapered portion 7A is formed eccentric with respect to the sliding portion.

(Male Ring) On the other hand, as shown in FIGS. 7B and 8, the male ring 3 has a head 13 which engages with the tapered portion 7A of the female ring 4.
And a torso integrated with this head 13 and fixed to the outer pipe
Consists of fourteen. The head 13 is a mushroom type one end of which is formed of an umbrella-shaped part and the other end is a cylindrical part formed slightly thinner than it, and a through hole 15 having a hexagonal cross section is formed so that the inner pipe passes therethrough. I have. The body 14 has a cylindrical shape having a through hole. One end of this through hole has a circular cross section (a circular through hole 16) so that the cylindrical portion can be fitted, and the other end has a hexagonal shape so that an outer pipe can be fitted. It is formed in a cross section (hexagonal through hole 17).
Since the diameter changes at the boundary between the outer pipe 1 and the inner pipe 2 in this way, the head is divided into a head 13 and a body 14 corresponding to each diameter to facilitate processing of each part. . In this embodiment, similarly to the first embodiment, as shown in FIG. 7, the taper angle θ ₄ of the male ring is changed to the taper angle θ _{5 of the} female ring.
Smaller than.

(Urethane Rubber Ring) This ring 18 is a hexagonal ring-shaped body and serves to prevent the inner pipe 2 from slipping. As shown in FIG. 5 (A), the upper and lower sides are sandwiched between the head 13 of the male ring and the end of the outer pipe 1, and the outer circumference and the inner circumference are between the inner circumference of the male ring body 14 and the inner pipe 2. Sandwiched between.

(How to assemble) The above components are assembled in the order shown in FIG. First, the inner pipe 2 is inserted into the outer pipe 1, and the body 14 of the male ring is fitted over the outer pipe 1 and fixed with screws 19. At this time, the end of the outer pipe 1 is located slightly below the boundary between the circular through hole 16 and the hexagonal through hole 17 in the body 14, and a urethane rubber ring is provided between the outer pipe end and the boundary.
18 were arranged so as to be fitted. Next, the male ring head 14 is fitted into the circular through hole 16 of the body, and this is fixed with screws 20. Then, the female ring 4 is externally fitted to the inner pipe 2.

(Five-stage operation rod) A 5-stage operation rod shown in FIG. 8B was manufactured by applying such a configuration. This is configured so that four hexagonal aluminum pipes 21 and one FRP insulated pipe 22 (a splice of a circular FRP pipe and a hexagonal aluminum pipe) can be fixed at predetermined drawing positions using a female ring and a male ring, respectively. Things. Since the method of use and the principle of fixing the inner pipe are the same as those in the first embodiment, the details are omitted, but the inner pipe can be fixed at a predetermined position simply by pulling out and releasing the hand. Also,
When storing the inner pipe, the female ring need only be pulled slightly upward.

Such an operation rod can be attached to various tools at the tip thereof for utility pole work or the like to perform various operations. In particular, in this embodiment, since the rotational movement can be transmitted, a screwdriver operation can be performed with the operation rod tip tool, which is extremely convenient. The use of the telescopic bar of this embodiment is not limited to the operation bar described above, and can be applied to various uses as described in the first embodiment.

(Test Example 3) In this example, a test for compressive strength was performed in the same manner as in Test Example 1. The sizes of the samples used in the test are as follows. The diameter of the pipe is represented by the distance between two opposing surfaces. Outer pipe: inner diameter 30.4mm, outer diameter 32.7mm, made of aluminum alloy Inner pipe: inner diameter 26.0mm, outer diameter 28.3mm, made of aluminum alloy Male ring: taper angle 37 ° 20 ', aluminum alloy made female ring: Outer diameter 45.0mm, height 20.1mm, sliding part length 12.3mm Eccentricity 0.95mm, taper angle 39 ° 20 ', made of stainless steel As a result, 500kg of some samples did not slip at all It can be seen that even if a slight slippage occurs, it can withstand a load of 300 kg, and it was confirmed that in the present example of the hexagonal pipe, sufficient compression resistance was obtained as in Test Example 1.

(Test Example 4) In the case of this example as well, when mass-produced, a slight slippage of the inner pipe occurred. As shown in FIG. Provided. This taper angle θ ₆ is 1 °. As a result, the defect rate was able to be suppressed to almost 0%, and it was confirmed that it was extremely effective in improving the yield. Further, the angle θ ₆ of the sliding portion with respect to the female ring center axis is preferably 1 to 2 °.

[0035]

As described above, according to the telescopic rod of the present invention, when extending, it is sufficient to simply pull out the inner pipe, and when shortening, the female ring may be slightly moved along the inner pipe. Therefore, the screw rotation work is unnecessary as in the conventional case, and the length can be adjusted very easily.
It can be effectively used for various poles and supports. Also, by applying a slight taper to the sliding portion, slip of the inner pipe can be reliably prevented. In particular, when a polygonal pipe is used, the rotary motion can also be transmitted, so that it is extremely convenient to use it as an operation rod or the like in utility pole work.

[Brief description of the drawings]

1A and 1B show a telescopic rod of the present invention using a circular pipe, wherein FIG. 1A is a sectional view and FIG. 1B is a cutaway perspective view.

FIGS. 2A and 2B show a female ring used for the telescopic rod of the present invention in FIG. 1, wherein FIG. 2A is a plan view seen from the taper side, and FIG.

3A is a cross-sectional view of a female ring used for the telescopic rod of FIG. 1, and FIG. 3B is a cross-sectional view of the male ring.

4A and 4B are cross-sectional views showing a female ring in which a sliding portion is also tapered; FIG. 4A is for a circular pipe, and FIG. 4B is for a hexagonal pipe;

FIGS. 5A and 5B show a telescopic rod of the present invention using a hexagonal pipe, wherein FIG. 5A is a cross-sectional view and FIG.

6 shows a female ring used for the telescopic rod of the present invention in FIG. 5, (A) is a plan view seen from the taper side, and (B) is a perspective view.

7A is a cross-sectional view of a female ring used for the telescopic rod of FIG. 5, and FIG. 7B is a cross-sectional view of the male ring.

8 (A) is a cutaway exploded view showing how to assemble a female ring and a male ring in the telescopic rod of FIG. 5, and FIG. 8 (B) is an overall perspective view of a five-stage operation rod using a hexagonal pipe.

[Explanation of symbols]

Reference Signs List 1 outer pipe 2 inner pipe 3 male ring 4 female ring 5 screw 6 tapered surface 7 through hole 7A taper portion 7B sliding portion 8 Duracon ring 9 Duracon ring 10 concave portion 11 hexagon guide 12 convex portion 13 head 14 torso 15 through hole 16 Circular through hole 17 Hexagon through hole 18 Urethane rubber ring 19 Screw
20 Screw 21 Hexagon aluminum pipe 22 FRP insulated pipe

Claims (3)

(57) [Scope of request for utility model registration] 1. A telescopic rod whose length is adjusted by taking an inner pipe inserted into and out of an outer pipe, wherein a slidable female ring is externally fitted to the inner pipe, and the female ring penetrates the inner pipe. The hole consists of a sliding part where the inner pipe slides, and a tapered part that contacts the end of the outer pipe,
A telescopic rod characterized in that the tapered part is eccentric with respect to the sliding part. 2. The inner pipe having a polygonal cross section is fitted so as not to rotate with respect to the outer pipe, and the cross section of the sliding portion of the female ring is a polygon corresponding to the inner pipe. The telescopic rod according to claim 1. 3. The telescopic rod according to claim 1, wherein the sliding portion is tapered.