JPH0377734B2 - - 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.

BACKGROUND ART FIGS. 5 and 6 show 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 an inner tube section 3, an outer tube section 3,
A lock body 6 is disposed in the four-pipe space 5. This lock body 6 connects and connects the inner pipe part 3 and the pipe body of the pipe fitted therein or the insertion pipe part 7 of the suction nozzle, and protrudes outward from the operation hole 8 of the outer pipe part 4. a pair of elastic legs 11 that protrude from the operation button 9 to both sides and whose tips abut against the stopper 10; It consists of a claw 14 that passes through the through hole 12 and engages with a locking recess 13 on the outer periphery of the insertion tube section 7.

In the free state, each leg 11 of the lock body 6 projects downward in a straight line or a substantially straight line, and is bent into the space 5 and inserted into the space 5 in an arcuate manner.
Therefore, under normal conditions, these leg pieces 11 are connected to the stopper 1.
0 and the operation button 9 that abuts the lower hole edge of the operation hole 8 of the outer tube section 4 is in a tensioned state as a base point, and as a result,
This creates an inward bias. That is, due to the biasing force of the leg piece 11, the claw 14 passes through the through hole 12 of the inner tube section 3 and reliably engages with the locking recess 13 of the insertion tube section 7. be.

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 pawl 14 also displaces outward and separates from the locking recess 13 of the insertion tube section 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 11 is
Force was required to displace the part outwardly, 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 pipe having a pipe connection structure that maintains good connectivity and improves operability.

Means for Solving the Problems In order to solve the above 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 the inner and outer pipes of the double pipe part. A lock body is provided in the gap between the parts, and the lock body has an operation button that projects outward from an operation hole formed in the outer tube part of the double tube part, and an operation button that projects from the operation button. and a pair of leg pieces having an elastic force that constantly displaces inward, and a pair of leg pieces formed on each of these leg pieces, passing through the through hole of the inner tube part and engaging with a locking recess on the outer periphery of the insertion tube part. A rib is provided at a position below the claw on the outer periphery of the leg piece and abuts on the inner surface of the outer tube portion of the double tube portion.

Effect In the configuration of the present invention described above, when the claw is engaged with the locking recess of the insertion tube part, the force applied to the connection part during use causes the claw, that is, the leg piece, to expand outward. When the operation button is pressed, the ribs contact the inside of the outer tube to suppress the movement, and when the operation button is pressed, only the tip of the leg bends, causing the leg to move downward rather than outward. The ribs reduce the deflection of the tips of the leg pieces, allowing the entire leg to flex, so the claws can be released even if the operating button is pushed a short distance. This will maintain good connectivity and improve operability.

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

In FIGS. 1 to 4, 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 large 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 a lead passed through the tube body 25, which supplies electricity from the vacuum cleaner 21 when the suction nozzle 22 has a built-in electric blower.

The lead wire 29 is inserted into one tube member 2.
It is isolated from the inside of the dust suction passage via a rib 30 protruding from 5b.

Now, the double pipe section 28 has inner and outer pipe sections 31 and 3.
A space 33 exists between 2, and this space 3
A lock body 34 is disposed at 3. The lock body 34 connects and connects the inner tube portion 31 and the insertion tube portion 26 of another tube body 25 that fits inside the inner tube portion 31, and protrudes outward from the operation hole 35 formed in the outer tube portion 32. It is obtained by integrally molding an operating button 36 and a pair of elastic legs 38, which protrude from the operating button 36 to both sides and whose tips abut against a stopper 37, made of synthetic resin. A claw 41 protrudes from the inner surface of the central portion of each leg piece 38 and penetrates through the through hole 39 of the inner tube portion 31 and engages with a locking recess 40 on the outer periphery of the insertion tube portion 26 . A rib 42 that comes into contact with the outer tube section 32 of the double tube section 28 is integrally formed on the outer side of the elastic leg piece 38 below the claw 41.

Reference numeral 43 indicates a sealing material adhered to the outer surface of the hole line of the through hole 39.

In the free state, each leg member 38 of the lock body 34 projects downward in a straight line or substantially straight line, and is inserted into the space 33 in an arcuate manner. Therefore, under normal conditions, these leg pieces 38 are in a tensioned state with the stopper 37 and the operation button 36 in contact with the lower hole edge of the operation hole 35 of the outer tube section 32 as the base points, thereby exerting an inward biasing force. is occurring. That is, due to the biasing force of the leg piece 38, the claw 41 is inserted into the insertion tube portion 2 through the through hole 39 of the inner tube portion 31.
It is engaged and held in the locking recess 40 of No. 6.

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.
The locking recess 40 of the insertion tube portion 26 is inserted through the through hole 39 of
is engaged in. Here, the leg piece 38 closes the through hole 39 via the sealing material 43 to perform air tightness.

It is used for normal cleaning in this state, but since a load is applied to this connection during use,
A force is applied to push the leg pieces 38 apart and release the engagement.

In this case, the claws 41 may be pushed apart by the biasing force of the leg pieces 38 alone, but in this embodiment, the outer tube portion 3 is placed below the leg pieces 38 and the outer claws 41.
2, the ribs 42 that come into contact with the inner surface of the tube prevent the claws 41, that is, the leg pieces 38, from expanding outward, and ensure the locking of the inner tube section 31 and the insertion tube section 26 during use. The extension tube connection is difficult to disconnect.

Next, when removing the insertion tube portion 26, the operation button 36 of the lock body 34 is pushed.

If there is no rib 41, the leg piece 1 is
Since only the tip of the claw 1 is bent, the claw 14 as a whole is displaced downward and spread outward, but the outward spread of the claw 14 is small.

In this embodiment, since the rib 41 is provided on the outer side of the leg piece 38 below the claw 41, when the operation button 36 is pressed, the rib 41 and the inner surface of the outer tube part 32 come into contact,
This prevents the leg piece 38 from shifting downward.

Therefore, since the bending of the tip of the leg piece 38 is suppressed, the leg piece 38 is deflected as a whole, and its downward displacement is also reduced, so that the claw 41 is displaced outward substantially horizontally.

Therefore, even if the pushing distance of the operation button 36 is small,
The claw 41 is released from the locking recess 40, and the insertion tube section 26 can be pulled out from the inner tube section 31.

Note that the above configuration includes the dust suction pipe 23 and the suction nozzle 2.
The same is true even if there is an insertion tube section 26 between the two.

Effects of the Invention As described above, the present invention is provided with a rib on the outside of the leg below the claw that contacts the outer tube, so that the biasing force inward of the leg is reduced in order to reduce the pressing force of the operation button. Even if the leg is connected, it works to prevent the leg from expanding outwards, so the connection is secure, and when the operation button on the lock body is pressed, not only the tip of the leg but the entire leg Since the handle flexes, the push of the operation button and the spread of the claw respond without any loss, allowing for a smooth disconnection operation and greatly improving usability. Furthermore, in terms of construction, it is only necessary to form ribs on the outside of each leg, making it extremely simple.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of a main part of a connecting part showing an embodiment of the present invention, Fig. 2 is a cross-sectional view in a connected state, Fig. 3 is an exploded perspective view, Fig. 4 is a perspective view of the whole, Fig. 5 The figure is a sectional view showing a conventional example, and FIG. 6 is a disconnected view of the same. 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...
...Claws, 42...ribs.

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 has an operation button protruding outward from an operation hole formed in the outer tube part of the double tube part, and a lock body disposed in the gap between the outer tube parts. A pair of legs protruding from each other and having an elastic force for constant displacement inward, and a pair of legs formed on each of these legs, passing through the through hole of the inner tube part and into the locking recess on the outer periphery of the insertion tube part. A dust suction tube for a vacuum cleaner, comprising an engaging pawl, and a rib protruding from the outside of the leg below the pawl, the rib coming into contact with the inner surface of the outer tube part.