JPS6041278B2 - telescopic tube - Google Patents

Description

[Detailed description of the invention] This invention relates to a telescopic tube.

For example, as shown on the left side of FIG. 4, in order to cope with the case where the area of only the husband board b of desk a is insufficient, an auxiliary husband board c is screwed onto one leg of the husband board b, and the auxiliary husband board c and the legs of the desk a are connected by a telescopic tube d, and when the auxiliary husband plate c is not needed, the tube d is contracted and the auxiliary husband plate c is suspended from the side of the desk a. When the auxiliary top plate c is required, the pipe d is extended and fixed with screws e so that the auxiliary top plate c is on the same horizontal plane as the main top plate b, or, although not shown in the figure, , when the auxiliary top plate c becomes the same horizontal plane as the main top plate b, the elastic protrusion provided on the side of the top plate is positioned by mating with the through hole provided in the outer cylinder. etc. However,
When trying to shrink such a telescopic tube,
It is necessary to loosen the screw e or push the protrusion into the outer cylinder, which has the disadvantage that machining is difficult or time-consuming. This invention can eliminate the above-mentioned drawbacks, and when the above-mentioned auxiliary husband plate c is no longer needed, the telescopic tube can be easily contracted by raising the auxiliary husband plate c a little and then pushing it down in the opposite direction. When the auxiliary top plate c is required, lift the auxiliary top plate c.When the main top plate b and the auxiliary top plate c are on the same horizontal plane, you will hear a “snap” sound. The purpose of the husband plate c is to provide an extensible tube which is extremely easy to operate, has a simple structure, and can be stopped at a position on the same horizontal plane as the main husband plate b. The structure will be explained based on the illustrated embodiment. FIG. 1 is an external view of one embodiment, and the structure is as shown in FIG. 2, and two notches provided in the generatrix direction of the outer segment 1 on one circumference ○ on the outer cylinder 1 and at positions corresponding to both ends of the diameter D' of the circumference ○. 1
1, 12 and one notch 13 in the circumferential direction,
At least two pairs of tongue pieces 31, 32; 4, 4, which protrude toward the inside of the outer cylinder 1 and can be retracted from each other.
2. The transverse section 1 of the outer cylinder 1 and the tongues 4, which are provided opposite to each other in the length direction of the outer cylinder 1 and include the free ends 3,', 32' of the tongues 3, 32. , 42 free end 4,'
, 42' of the outer cylinder 1 are located close to each other. A cylindrical ring 7 having an outer diameter E which is not smaller than the outer diameter D of the punch 2 is slidably iron-coupled. The one shown in FIG. 1 has two pairs of tongue pieces 3. ,32:
The free ends 3.4, 42 of the two pairs of tongues 3, 32; 4, 42 are opposed to each other on one generatrix.
′, 32′: As long as the cross sections 1 and D including 4, ′, and 42′ are close to each other, the tongue pieces 3 and 4 as shown in FIG.
There is no problem even if they are opposed to each other with a slight deviation in the circumferential direction.

Since this embodiment has the above-mentioned configuration, when the rod punch 2 is pulled out from the outer cylinder 1 of the telescoping tube and the state shown in Fig. 3A is reached, the tongue pieces 3, 32 have no elasticity. Because it has, it falls into the small monster part 6 of Samamura 2, and at that time, the tongue piece 3,,3
The free ends 3,', 32' of 2 hit the small diameter portion 6 or 4 and the cylindrical ring 7, producing a snapping sound.

At this time, when the Yomimura 2 is returned to its original position, the free ends 3, ′, 32′ of the tongue pieces 3, 32 are connected to the stepped portion 9 formed between the large light portions 8 and 4 of the pestle 2 and the diameter portion 6. Therefore, the punch 2 cannot be inserted into the outer cylinder 1 any further.

Next, when you want to shorten the length by inserting the punch 2 into the outer cylinder 1,
When the punch 2 is pulled out a little from the outer cylinder 1 as shown in the opening in FIG. , 32 and gradually the free end 3. ', 32' are opened until the end face of the small cylindrical ring 7 comes into contact with the free ends 4, ', 42' of the other pair of tongue pieces 4, 42, and the booklet 2 cannot be pulled out any further. Stop at.

At this time, the free end 3 of the tongue piece 3,,32. ', 32' are sufficiently pushed open by the ring 7, and conversely, the outer periphery of the small cylindrical ring 7 is elastically secured from diametrically opposite positions by a pair of tongues 3, 32. Therefore, when the stick punch 2 is inserted into the outer cylinder 1, as shown in FIG. 3C,
While the small cylindrical ring 7 remains at that position, only the birch pestle 2 advances into the outer cylinder 1.

Thus, in the punch 2, the step 9 pushes open the free ends 4,', 42' of the pair of tongues 4, 42, and the step 9 then comes into close contact with the end surface 10 of the small cylindrical ring 7, forming a small cylinder. The ring 7 enters the outer cylinder 1 together with the twill 2 for the first time, but since the outer ring E of the small cylindrical ring 7 is not smaller than the outer ring D of the Haimura 2, the pair of tongue pieces 3, 3
The free ends 3,', 32' of 2 do not fall into the step 9 of the bar 2, the step 9 passes unobstructed by the free ends 3,', 32', and the bar 2 slides smoothly without difficulty. The length of the telescopic tube can be reduced by entering the outer cylinder 1.

The reason why the cross sections 1 and D are provided close to each other is to avoid making the inside of the cylindrical ring 4 as large as possible.

This invention has the structure and function described above, and as the length is extended, there is a point where a snapping sound is emitted inside the outer cylinder 1, and when Fujimura 2 is returned to its original position, the Harumura 2 is After stopping, it is impossible to enter the outer cylinder 1 any further, and if you want to shorten the length, pull out the birch pestle 2 just a little, and the hamura 2 will no longer be able to be pulled out. 2 into the outer section 1, it will shrink smoothly, so if it is used as a support tube for the auxiliary top plate c' of a desk, for example, as shown on the right side of Figure 4, the auxiliary top plate c' will be unnecessary. In this case, if you raise the husband plate c' by an inch and turn the husband plate in the opposite direction from where it once stopped, you can fold the husband plate c' smoothly, and when you need an auxiliary top plate c', If you hold the husband plate in one hand and rotate it, stop at the place where it makes a snap sound and return it to its original position, the auxiliary husband plate is ready for use and can be used as a telescopic tube for supporting the foldable part. As shown by the drawing symbol A in Fig. 4, the telescoping tube has no external protrusions or operating parts and can be locked in a fixed position, making it easy to operate and has a simple structure. can be provided.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of an embodiment of the telescoping tube according to the present invention, Fig. 2 is a longitudinal sectional front view, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 is a diagram of a desk having a foldable auxiliary end plate. FIG. 5 shows a perspective view of another embodiment, in which 1 is an outer cylinder, 2 is a punch, 3, 32; 4, 42 are a pair of tongue pieces, 3,'
, 32′: 4, ′, 42′ each have a pair of tongue pieces, 5
is a flange portion, 6 is a small diameter portion, 4 is a small cylindrical ring, 1 is a free end 3,
', 32' cross section of the outer cylinder 1, 0 is the free end 4,',
42', D indicates the outer diameter of the punch 2, and E indicates the outer diameter of the small cylindrical ring 7. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4

Claims (1)

[Claims] 1 Consisting of an outer cylinder 1 and a rod 2 inserted into the outer cylinder, a position on one circumference O on the outer cylinder 1 and corresponding to both ends of the diameter D' of the circumference O Two notches 11 and 12 provided in the generatrix direction of the outer cylinder 1 and one notch 13 in the circumferential direction protrude toward the inside of the outer cylinder 1 and face each other. At least 2 to 3 pairs of tongues that can be
_1, 3_2: 4_1, 4_2, provided so as to face each other in the length direction of the outer cylinder 1, and the tongue pieces 3_1, 3_2
A cross section of the outer cylinder 1 including the free ends 3_1' and 3_2' of
I and the free ends 4_1', 4_2' of the tongue pieces 4_1, 4_2
The cross section II of the outer cylinder 1 including
The telescopic tube is characterized in that a small cylindrical ring 7 having an outer diameter E not smaller than the outer diameter D of the rod 2 is slidably fitted therein.