JPH0363892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dust suction pipe such as an extension pipe in a vacuum cleaner used in general households, and particularly to a pipe connection structure thereof.

Prior Art FIG. 6 shows a pipe connection part of a conventional dust suction pipe. That is, a double tube section 2 is formed at the end of the tube body 1, and inner and outer tube sections 3 and 4 of the double tube section 2 are formed at the end of the tube body 1.
A locking body 6 is arranged in the space 5 between them. This lock body 6 connects and connects the inner tube portion 3 with another tube body fitted therein or with an insertion tube portion 7 of a suction nozzle, and protrudes outward from the operating hole 8 of the outer tube portion 4. a pair of elastic leg pieces 11 that are drilled inward from the operation button 9 and come into contact with each tip gas stopper 10; It consists of a claw 14 that passes through the hole 12 and engages with a locking recess 13 on the outer periphery of the insertion tube section 7. Each leg 11 of the lock body 6 is set in a straight line or a substantially straight line in a free state, and is bent into an arc shape and inserted into the space 5.
Therefore, under normal conditions, these leg pieces 11 are in a tensioned state with the stopper 10 and the operation button 9 in contact with the lower hole edge of the operation hole 8 of the outer tube section 4 as the base points, thereby preventing the legs from being attached inward. It is generating power. That is,
Due to the biasing force of this leg piece 11, the claw 14 is attached to the inner tube part 3.
The locking recess 13 of the insertion tube part 7 passes through the through hole 12 of
It is designed to ensure that it engages securely.

Problems to be Solved by the Invention In the conventional configuration described above, when removing the insertion tube section 7 from the inner tube section 3, the operation button 9 is pushed to deform each leg piece 11 so as to bulge outward. As the leg piece 11 deforms, the claw 14 also displaces outward and separates from the locking recess 13 of the insertion tube part 7.

By the way, in order to ensure the connection between the inner tube section 3 and the insertion tube section 7, the biasing force of the leg piece 11 must be increased to some extent. However, when the biasing force is increased, each leg piece 1 is
1 required force to displace outward, resulting in poor operability. In other words, the conventional device had a problem in that connection reliability and improved operability were not compatible with each other.

The present invention solves these conventional problems and provides a dust suction tube having a tube connection structure that maintains good connectivity and improves operability.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention has the following features:
A pipe body having a double pipe part at the end, another pipe main body or an insertion pipe part of a suction nozzle that is fitted into the inner pipe part of the double pipe part, and of the double pipe part, A lock body is provided in the gap between the outer tube parts, and the lock body has an operation button that protrudes outward from an operation hole formed in the outer tube part of the double tube part, and a lock body that is pierced by the operation button. A pair of leg pieces are provided, each having an elastic force for displacement inward at all times, and a leg piece is formed on each of these leg pieces to penetrate through the through hole of the inner tube part and engage with the locking recess on the outer periphery of the insertion tube part. The through hole is closed by the leg piece through a sealing material.

Function In the configuration of the present invention described above, suction force acts on the leg piece through the through hole when the vacuum cleaner is operated. Therefore, the engagement force applied to the engagement recess is the biasing force of the leg piece plus the above-mentioned suction force. Therefore, even if the biasing force of the leg piece itself is reduced, a reliable connection can be obtained, and furthermore, the leg piece can be deformed via the operation button with a small force.

Example Examples thereof will be described below with reference to the accompanying drawings.

In FIGS. 1 to 5, reference numeral 21 denotes a vacuum cleaner, which sucks and collects dust sucked by a suction nozzle 22 through two dust suction pipes 23 and a hose 24. The two dust suction tubes 23 have the same configuration, and the connection configuration between them and the connection configuration with the suction nozzle 22 are also the same. In the following explanation, the connection configuration between the two dust suction tubes 23 will be explained. Let's take this as an example.

The tube body 25 of the dust suction tube 23 is obtained by joining semi-cylindrical tube members 25a and 25b made of synthetic resin, and an insertion tube portion 26 is integrally formed on one of the tube members 25a and 25b. On the other hand, a tube member 27 having a larger diameter and made of a separate member is clamped and fixed. That is, the other tube body 25 has a double tube section 28 formed by the tube member 27 described above. 29 is the tube body 25
This is a lead wire passed through the vacuum cleaner 21 to supply electricity from the vacuum cleaner 21 when the suction nozzle 22 has a built-in electric brush. The insertion portion of the lead wire 29 is a rib 3 bored from one pipe member 25b.
0 to the dust suction passage.

Now, the double tube section 28 has an inner tube section, an outer tube section 31,
A space 33 exists between 32, and a lock body 34 is disposed in this space 33. The lock body 34 connects the inner tube portion 31 and the insertion tube portion 26 of the other tube body 25 that fits inside the inner tube portion 31.
An operation button 36 that protrudes outward from an operation hole 35 formed in the outer tube part 32 and a pair of elastic legs 38 that are bored on both sides of the operation button 36 and whose tips abut against stoppers 37 are combined. It is obtained by integrally molding it with resin. The insertion tube portion 2 is inserted through the through hole 39 of the inner tube portion 31 into the inner surface of the central portion of each leg piece 38.
6. A claw 41 that engages with a locking recess 40 on the outer periphery is bored. Reference numeral 42 indicates a sealing material adhered to the outer surface of the hole edge of the through hole 39.

Each leg piece 38 of the lock body 34 is set in a straight line or substantially straight line in the free state, and is inserted into the space 33 in a curved arc shape. Therefore, under normal conditions, these leg pieces 38 are in a state of tension at the stopper 37 and the base point of the operation button 36 that comes into contact with the lower hole edge of the operation hole 35 of the outer tube section 32, thereby causing the inward movement. A biasing force is generated. That is, the claw 41 is engaged and held in the locking recess 40 of the insertion tube section 26 through the through hole 39 of the inner tube section 31 by the biasing force of the leg piece 38 .

In the above configuration, FIG. 2 shows the connection state of the insertion tube section 26 to the inner tube section 31, and as mentioned above, the claw 41 is connected to the inner tube section 31 by the elasticity of the leg piece 38.
It engages with the locking portion 40 of the insertion tube portion 26 through the through hole 39 . Here, the leg piece 38 closes the through hole 39 via the sealing material 42 to perform air tightness. In particular, when the vacuum cleaner 21 is operated with this configuration, suction force acts on the leg piece 38, and in addition to its own elasticity, the suction displacement force functions as a pressing force against the sealing material 42, and the through-hole The air tightness at the 39 portion is improved, and the engagement of the pawl 41 with the locking recess 40 is made stronger.

Next, when removing the insertion tube part 26, use the lock body 34.
Press the operation button 36. Here, as the operation button 36 is pressed, the leg piece 38 is displaced downward as a whole and expands outward, and the pawl 41 is also disengaged from the locking recess 40 and inserted from the inner tube part 31. Pipe part 26
can be removed (see Figures 1 and 3).

During the above operation, since the operation of the vacuum cleaner is naturally stopped, no suction force is applied to the leg piece 38, and only an operating force that resists the urging force is required.

Note that the above connection configuration is the same between the dust suction pipe 23 and the insertion pipe portion 26 of the suction nozzle 22.

Effects of the Invention As described above, the present invention applies suction force to the legs of the lock body, so even if the elasticity of the legs is weakened, a reliable connection force can be obtained, and the disconnection operation It is also easy to use and can greatly improve usability.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of a connecting part showing an embodiment of the present invention, FIG. 2 is a sectional view in a connected state, FIG. 3 is a sectional view when disconnected, and FIG. 4 is an exploded perspective view. FIG. 5 is an overall perspective view, and FIG. 6 is a sectional view showing a conventional example. 22... Floor nozzle, 25... Pipe body, 26...
Plug-in pipe part, 28...double pipe part, 31...inner pipe part,
32...Outer tube part, 33...Space, 34...Lock body, 35...Operation hole, 36...Operation button, 38...
Leg piece, 39... Through hole, 40... Locking recess, 41...
...Claw, 42...Sealing material.

Claims (1)

[Claims] 1 A pipe body having a double pipe part at the end, another pipe main body or an insertion pipe part of a suction nozzle that is fitted into the inner pipe part of the double pipe part, and an inner pipe part of the double pipe part. , a lock body disposed in the gap between the outer tube parts, and the lock body includes an operation button protruding outward from an operation hole formed in the outer tube part of the double tube part, and the operation button. 1, which is more protruding and has an elastic force that constantly displaces inward.
It is composed of a pair of leg pieces and a claw formed on each leg piece that penetrates the through hole of the inner tube part and engages with the locking recess on the outer periphery of the insertion tube part, and the through hole is made of a sealing material. Vacuum cleaner dust suction pipe closed with leg piece through.