JP2873545B2 - Pipe connection structure with adjustable expansion and contraction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure capable of adjusting expansion and contraction.

[0002]

2. Description of the Related Art A conventional pipe connecting structure capable of adjusting expansion and contraction comprises an inner tube having an engaging pin projecting and retracting movable against an anti-shrinking elastic force, and an engaging engagement with the engaging pin. An outer tube having a plurality of holes provided in series, the inner tube is inserted into this outer tube, and the outer tube and the inner tube are connected by engaging an engaging pin of the inner tube with an arbitrary engaging hole. Then, the engaging pin engaged with the engaging hole is pushed in against the anti-shrink elasticity, the outer tube is slid with respect to the inner tube, another engaging hole is selected and the engaging hole is selected. The entire length of the pipe can be adjusted by expanding and contracting the engagement pin by returning and protruding the engagement pin.

[0003]

In such a conventional pipe connecting structure capable of adjusting the expansion and contraction, the engaging pin of the inner pipe moves on the extension of the row of the engaging holes when adjusting the expansion and contraction of the connecting pipe. If the outer tube is not slid with respect to the inner tube, the engagement pin cannot be engaged with another engagement hole, but the outer tube is often displaced and rotated during the sliding movement, When the outer pipe is slid with respect to the inner pipe to extend the entire length of the connection pipe, the outer pipe is displaced and rotated, so that not only can it not easily fit into the desired engagement hole, but also the May be pulled out. When this is done, this is very dangerous depending on the work situation, and if the inner pipe and the outer pipe often come off when extending the entire length of the connecting pipe, it will be reconnected each time (For example, the inner tube must be fitted into the outer tube while pushing the engaging pin), which is very troublesome.

The present invention has found such a problem and solved the problem. When the outer tube is slid with respect to the inner tube, the engaging pins of the inner tube are arranged in a row of the engaging holes of the outer tube. It is regulated to move on the extension line, preventing the engagement pin from being securely inserted into another engagement hole and accidentally pulling out the outer tube from the inner tube, or even if it is pulled out, it must be in the final position. The present invention provides an epoch-making adjustable telescopic pipe connection structure in which an engagement pin is inserted into an engagement hole once, and is not pulled out unless the engagement pin is pushed in again, so that the outer tube is not accidentally removed. is there.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

An engagement pin 2 is protruded from the inner tube 1, and the engagement pin 2 is provided so as to be movable in and out against the anti-shrink elasticity. Are provided in series in the longitudinal direction of the outer tube 3, and the engagement pins 2 engaged with the engagement holes 4 are provided.
, The outer tube 3 is slid with respect to the inner tube 1, another engaging hole 4 is selected, and the engaging pin 2 is inserted into the engaging hole 4.
In the configuration with stretch adjustable pipe connection structure so as to stretch adjust the overall length to engage and the outer tube 3 as a vent out to the side edge of the inner tube 1 and the outer tube 3 at least the edge And the engaging pin 2 is positioned between the engaging pin 4 and the engaging hole 4 closest to the edge in a pulling-out direction corresponding to the arrangement direction of the engaging holes 4.
Enables pulling an outer tube 3 only when the location, the engagement in other drawing direction in which the outer tube 3 was shifted rotated relative to the inner tube 1
The present invention relates to a pipe connection structure capable of adjusting expansion and contraction, wherein a guide structure 5 for locking a pin 2 to prevent a pull-out slide is provided on an inner surface of an outer tube 3.

Further, a curved guide plate 6 is provided on the inner peripheral surface of the outer tube 3, and the curved guide plate 6 is provided with guide grooves 7 corresponding to the four rows of the engagement holes to constitute the guide structure 5. those of the stretchable adjustable pipe coupling structure according to claim 1 Symbol mounting and.

[0008]

When the engagement pin 2 engaged with the engagement hole 4 is pushed in and the outer tube 3 is slid with respect to the inner tube 1, the engagement pin 2 of the inner tube 1 is moved by the guide structure 5 to the outer tube. 3 is restricted so as to move on the extension of the hole row of the engagement hole 4, and the outer tube 3 does not shift with respect to the inner tube 1. 4 and the inner tube 1 and the outer tube 3
The overall length of the pipe can be adjusted.

Further, when extending the entire length pipe, in a state engaging pin 2 is the outer tube 3 to shift rotation is not on the hole array extension of the engaging hole 4, the engaging pin 2 in the guide structure 5 Lock it
The pull-out movement is prevented, and the outer pipe 3 cannot be pulled out from the inner pipe 1. That is, when the outer tube 3 is pulled out from the inner tube 1, the guide structure 5 causes the engagement pin 2 of the inner tube 1 to be engaged with the engagement hole 4 at the final position near the end of the outer tube 3 once. And
The engaging pin 2 cannot be pulled out unless it is pushed in again and re-engaged and slid. Therefore, the inner tube 1 is erroneously inserted into the engagement hole 4 at the final position of the end of the outer tube 3 because the inner tube 1
There is no possibility that the outer tube 3 is pulled out of the outer tube.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, an engaging pin 2 is provided at an outer surface of an inner tube 1 at a position close to a connecting end thereof, and each of the engaging pins 2 is protruded.
2 is attached to the free ends of a U-shaped leaf spring 8 provided in the inner tube 1 as shown in FIG. A telescopically adjustable pipe which is provided so as to be movable in and out and has a plurality of engaging holes 4 in which the engaging pins 2 are engaged in the longitudinal direction of the outer tube 3 into which the inner tube 1 can be fitted. The present invention is applied to a connection structure, and is provided between an edge of the inner tube 1 from which the outer tube 3 is pulled out and the engaging hole 4 closest to the edge, on the extension line of the row of the engaging holes 4. The outer tube 3 can be pulled out only when the engaging pin 2 is located at
When the outer tube 3 is displaced and rotated with respect to the inner tube 1 and the engaging pin 2 is not positioned on the extended line of the hole row of the engaging hole 4, a guide structure 5 for preventing the pull-out slide is provided.

Specifically, an inner surface between an end of the outer tube 3 into which the inner tube 1 is fitted and the engaging hole 4 closest to the end is provided on the inner surface.
The two curved guide plates 6 as shown in FIG.
Is provided so as to avoid the extension of the row of the engagement holes 4 provided in the outer tube 3.
When the inner tube 1 is inserted into and connected to the outer tube 3 or when the outer tube 3 is removed from the inner tube 1, the pushed-in engagement pin 2 moves along the guide groove 7 when the extended line portion of the hole is used as the guide groove 7. It is configured so that it can only slide. By adopting this structure, the cost of parts is not required, and the production becomes very simple. In addition, since the curved guide plate 6 is attached to the inner peripheral surface of the outer tube 3 to reduce the inner diameter of the outer tube 3, the play of the connecting portion due to the difference in the insertion diameter between the outer tube 3 and the inner tube 1 is eliminated. There is also the effect of doing.

Further, in this embodiment, a guide for the insertion position of the engaging pin 2 when the inner tube 1 is inserted into the outer tube 3 is located at a position closer to the connection end than the respective engaging pins 2 on the outer surface of the inner tube 1. A state in which the engaging pin 2 also serves as a guide assist when sliding in the guide groove 7, and does not catch on the curved guide plate 6 when the outer tube 3 is pulled while being shifted with respect to the inner tube 1. A projection 9 is formed to assist the hooking on the curved guide plate 6 when the engaging pin 2 slides in the pull-out direction in a state where the engaging pin 2 does not follow the guide groove 7 and the engaging pin 2 does not follow the guide groove 7. I have. The convex portion 9 may be formed integrally with only one of the front sides of the respective engaging pins 2, but it is desirable to form the convex portion 9 in a two-part manner because a good auxiliary effect can be obtained.

Therefore, the guide groove 7 as the guide structure 5
In the inner tube 1 from the final position near the end where the inner tube 1 of the outer tube 3 where the inner tube 1 is not formed is inserted, the engaging hole 4
The engaging pin 2 is not positioned on the extension of the hole row
Is in a state of being shifted with respect to the inner tube 1).
And the outer tube 3 can be slid, but on the edge side of the engagement hole 4 at the final position near the insertion edge of the outer tube 3 near the insertion side of the inner tube 1, the engagement with the extension of the row of the engagement holes 4 is performed. If the pin 2 is not located, the engaging pin 2 will be caught on the base edge of the curved guide plate 6 and cannot be pulled out any further. Therefore, when extending the entire length of the pipe, the engaging pin 2 is connected to the outer tube 3 as in the conventional case. The outer tube 3 is not pulled out from the inner tube 1 by mistake because it cannot be fitted into the engagement hole 4 at the final position near the inner tube 1 insertion side edge. By rotating the outer tube 3 along the pin 2, the engaging pin 2 is guided and engaged by the engaging hole 4 at the final position near the inner tube 1 insertion side edge, so that the deviation rotation can be corrected. It can be done very easily. Also, when the outer tube 3 is pulled out from the inner tube 1, the engaging pin 2 is temporarily inserted into the engaging hole 4 at the final position near the inner tube 1 insertion side edge of the outer tube 3. , The outer tube 3 cannot be pulled out of the inner tube 1 unless the engagement pin 2 is slid along the guide groove 7 again.

The guide structure 5 of the present invention is not limited to the present embodiment, but can be designed as appropriate. However, as in the present embodiment, two curved guide plates are simply provided on the inner peripheral surface of the outer tube 3. The structure adopting the structure in which the inner tube 6 is attached is advantageous in that the cost of parts is not increased, the production is extremely simplified, and the play at the connecting portion between the outer tube 3 and the inner tube 1 is eliminated. It is desirable because there is.

Reference numeral 10 in the figure denotes a welded portion obtained by welding the curved guide plate 6 through a welding hole.

[0016]

According to the present invention because the structure described above, when the slide moving the outer tube to the inner tube to extend the entire length of the connecting <br/> forming pipe, the outer tube is displaced times in the state dynamic to engagement pin is not on the hole array extension of the engagement hole, the engagement guide structure
The mating pin is locked and the pull-out movement is prevented, so that the outer pipe is not pulled out of the inner pipe.Also, even when the outer pipe is pulled out of the inner pipe, the guide pin makes the engaging pin of the inner pipe the edge of the outer pipe. It is always inserted into the engaging hole at the final position in the vicinity, and it will not be pulled out unless this engaging pin is pushed in again and disengaged and slid again, so it is excellent that it will not accidentally pull out the outer tube from the inner tube. It becomes a pipe connection structure that is adjustable in expansion and contraction.

Further, if a curved guide plate is provided on the inner peripheral surface of the outer tube, and a guide groove is provided in the curved guide plate in accordance with the row of engagement holes, the guide structure can be manufactured very easily. In addition, the pipe connection structure has an excellent structure that does not require manufacturing costs and can be adjusted to expand and contract.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing a separated state of the present embodiment.

FIG. 2 is a cutaway explanatory view of an inner tube of the present embodiment.

FIG. 3 is a cutaway explanatory view of an outer tube of the present embodiment.

FIG. 4 is a front view of the outer tube of the present embodiment.

FIG. 5 is an operation explanatory view of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner tube 2 Engagement pin 3 Outer tube 4 Engagement hole 5 Guide structure 6 Curved guide plate 7 Guide groove

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenshin Kaneko 972, Nitta, Sanuki-shi, Niigata, Niigata Prefecture Marsanai Co., Ltd. (56) References Real Open 6-85909 (JP, U) Real Open Akira 61-19116 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16B 7/14

Claims (2)

(57) [Claims] 1. A inner tube 1 the engaging pin 2 projecting from the, protruding and retracting movably provided against the engaging pin 2 in Kochijimi elastic force, the engagement of the engaging pin 2 is engaged A plurality of holes 4 are provided in series in the longitudinal direction of the outer tube 3, the engaging pins 2 engaged with the engaging holes 4 are pushed in, and the outer tube 3 is slid with respect to the inner tube 1. And the engaging pin 2 is inserted into the engaging hole 4.
In the configuration with stretch adjustable pipe connection structure so as to stretch adjust the overall length to engage and the outer tube 3 as a vent out to the side edge of the inner tube 1 and the outer tube 3 at least the edge And the engaging pin 2 is positioned between the engaging pin 4 and the engaging hole 4 closest to the edge in a pulling-out direction corresponding to the arrangement direction of the engaging holes 4.
Enables pulling an outer tube 3 only when the location, the engagement in other drawing direction in which the outer tube 3 was shifted rotated relative to the inner tube 1
A pipe connecting structure capable of expansion and contraction, wherein a guide structure 5 for locking the pin 2 to prevent the slide from being pulled out is provided on the inner surface of the outer tube 3. 2. A guide structure 5 comprising a curved guide plate 6 provided on the inner peripheral surface of the outer tube 3 and guide grooves 7 provided in the curved guide plate 6 so as to correspond to four rows of engagement holes. stretchable adjustable pipe coupling structure according to claim 1 Symbol mounting and.