JPH11206655A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lead of air in a dust passage at a sliding portion of an extension pipe in a vacuum cleaner with an extendable extension pipe. SOLUTION: An extendable extension pipe wherein an inner pipe 11 is disposed so as to be slidable with respect to an outer pipe is fitted, and an extendable bellows pipe 35 adapted for connection with an end of the pipe 11 is fitted inside the outer pipe. And a rotation preventing groove being a recess and lock blades 41 being protrusions are formed respectively in the inner surface of the outer pipe and on the outer surface of the inner pipe 11 to prevent the extension pipe from being rotated. The inner diameter of the bellows pipe 35 is made larger than that of the pipe 11. Further, a pair of conductive wires are embedded in the pipe 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a telescopic extension tube of a vacuum cleaner.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing a conventional vacuum cleaner described in, for example, Japanese Patent Laid-Open No. 9-215642, and FIG.
6 is a longitudinal sectional view showing an extension tube of a conventional vacuum cleaner, FIG. 6 is a side sectional view of the same extension tube, FIG. 7 is a side sectional view showing a storage state of the extension tube, and FIG. 8 is a sectional view of the extension tube shown in FIG. It is AA sectional drawing.

In FIG. 1, reference numeral 1 denotes a cleaner main body, which has an electric blower 2 for generating an intake pressure and a dust collecting chamber 4 for accommodating a dust collecting bag 3 for collecting dust. One end of a flexible hose 5 in which two piano wires 52 and two electric wires 53 are embedded spirally is connected to the dust collection chamber 4, and the other end of the hose 5 controls the rotation of the electric blower 2. A control device 6 is provided. The control device 6 is connected to the electric blower 2 via a piano wire 52. Reference numeral 7 denotes an electric suction tool, which has a built-in rotary cleaning body 8 and a motor 9 serving as a driving source thereof. Reference numeral 10 is connected to the control device 6, and includes an inner pipe 11 and an outer pipe 12
This is an extension tube that is configured to be able to expand and contract from the inside, and a power supply path 13 is formed inside. Then, electric power is supplied from the cleaner main body 1 to the motor 9 via the electric power supply path 13 provided in the extension pipe 10 and the electric wire 53 embedded in the hose 5. Reference numeral 14 denotes a brush switch for turning on and off the rotation of the motor 9 of the electric suction tool 7 provided in the control device 6.

Here, the structure of the extension pipe 10 will be described in detail. As shown in FIG. 5, the extension pipe 10 includes a cylindrical inner pipe 11, an outer pipe 12, and a connection pipe 15. A slight gap is provided between the outer diameter of the inner pipe 11 and the inner diameter of the outer pipe 12, and the inner pipe 11 is slidably inserted into the outer pipe 12. A connection pipe 15 is inserted and fixed to the other end of the inner pipe 11.

[0007] As shown in FIG. 6, the extension tube 10 is provided with a telescopic lock button 16 for fixing sliding of the inner tube 11 at an end of the outer tube 12. A coil spring 17 is provided below the telescopic lock button 16, and acts to bias a lock piece 18 provided at an end of the telescopic lock button 16 to a plurality of lock grooves 19 provided on the outer peripheral surface of the inner tube 11. doing. By pressing the telescopic lock button 16 while the extension tube 10 is in the extended state, the lock of the extension tube 10 is released, and the inner tube 11 and the outer tube 12 can slide.

Further, as shown in FIG. 7, when the extension tube 10 is in a contracted state, the entire inner tube 11 can be housed inside the outer tube 12. As described above, since the plurality of lock grooves 19 are provided on the outer peripheral surface of the inner tube 11, the length of the extension tube 10 can be fixed at an arbitrary position by the locking position of the telescopic lock button 16. it can.

Next, the structure of the power supply path 13 in the extension pipe 10 will be described. As shown in FIG.
1 is divided into a garbage flow path 20 and a power supply chamber 21,
In the power supply chamber 21, a power supply path 13 formed by a coil spring 22 and a cover 23 that covers the conductor are provided. The cover 23 is formed of an inner tube cover 24 and an outer tube cover 25. The inner tube cover 24 and the outer tube cover 25 are moved along with the sliding of the inner tube 11 and the outer tube 12. 24 inside the outer tube cover 2
5 is configured to be inserted and slid in the overlap.

Further, the outer tube cover 25 is provided with a partition wall 26 in the longitudinal direction of the extension tube 10 so that the two coil springs 22 do not come into contact with each other. Further, as shown in FIG. 6, the inner tube cover 24 is fixed to the power supply chamber 21 of the inner tube 11, and the outer tube cover 25 is fixed to the inner surface of the outer tube 12.

A hose 5 is connected to one end of the outer tube 12 of the extension tube 10.
And a pair of electrode pins 27 electrically connected to the outer tube cover 25 via a pair of first lead wires 28, respectively.
Connected to a pair of coil springs 22 disposed therein. Further, the coil springs 22 are provided along the longitudinal direction in the space partitioned by the partition 26 of the outer tube cover 25, and the respective coil springs 2 are provided.
2 is connected to a pair of second lead wires 29 fixed at a fixed length in the inner tube cover 24, and the second lead wire 29 is guided to the connection tube 15. The change in the length of the power supply chamber 21 due to the expansion and contraction of the extension tube 10 corresponds to the elasticity of the coil spring 22 having elasticity.

Next, the operation of the extension pipe 10 of the conventional vacuum cleaner will be described. A signal from a control device 6 provided at the other end of the hose 5 is transmitted to the electric blower 2 via a piano wire 52 embedded in the hose 5, and the electric blower 2 rotates. The dust sucked from the electric suction tool 7 by the negative pressure of the electric blower 2 is captured from the extension pipe 10 through the hose 5 into the dust bag 3.

When the brush switch 14 provided in the control device 6 is turned on, power is supplied from the cleaner main body 1 to the extension pipe 10 through the electric wire 53 embedded in the hose 5, and the electrode pin 27 and the first lead wire are supplied. 28, coil sling 22, second
Is supplied to the motor 9 in the electric suction tool 7 through the lead wire 29. The rotation of the motor 9 rotates the rotary cleaning body 8.
Rotates and scrapes out the garbage in the carpet.

Further, when the telescopic lock button 16 is pressed, the lock piece 18 comes off the lock groove 19, and the inner pipe 11 and the outer pipe 1
2 becomes slidable. The change in the length of the power supply path 13 is such that the inner tube cover 24 and the outer tube cover 25 slide with the sliding of the inner tube 11 and the outer tube 12, and the elastic coil spring 22 expands and contracts. Corresponding.

FIG. 9 is a side sectional view of a connecting portion showing an extension pipe of a conventional vacuum cleaner shown in Japanese Patent Application Laid-Open No. 9-215641 (hereinafter referred to as prior art 2). In the drawing, an extension tube 10 is composed of an outer tube 12 and an inner tube 11 slidable in the outer tube 12, the inner tube 11 has an inner tube conductor 30, and the outer tube 12 has an outer tube conductor. A body 31 is provided, and the two conductors 30 and 31 are connected by a coiled conductor 32 spirally wound around the outer peripheral surface of the inner tube 11.

[0014] Also in the prior art 2, the electric power supply from the vacuum cleaner body is supplied to an electric suction tool (not shown) through a hose (not shown).

[0015]

As described above, the extension pipe of the conventional vacuum cleaner is provided with the sliding portion between the inner pipe and the outer pipe. A slight gap is required, and there is a problem that wind leakage occurs from the gap, and the dust absorption performance is reduced.

Further, as shown in FIG. 8, since the power supply path is provided so as to protrude into the cylinder, the dust flow path becomes narrow, and there is a problem that dust is easily generated.

Further, the prior art 2 has a problem that the outer tube conductor, the inner tube conductor, and the coil-shaped conductor overlap in cross section due to the structure thereof, so that the outer diameter of the extension tube becomes large and the usability is poor. there were.

The vacuum cleaner of the present invention has been made in order to solve the above-mentioned problems, and has as its object to provide a vacuum cleaner having an extendable and extendable pipe without air leakage in a garbage flow path. And

It is a further object of the present invention to provide a vacuum cleaner having an extension pipe which can be expanded and contracted without air leakage in the dust flow path and which keeps the power supply path constantly energized even when the extension pipe is expanded and contracted. And

[0020]

SUMMARY OF THE INVENTION A vacuum cleaner according to the present invention comprises a telescopic extension pipe in which an inner pipe and an outer pipe are slidably arranged, and an electric suction tool connected to one end of the extension pipe. And a conductor disposed on the extension pipe and supplying electric power to the electric suction tool, wherein the extension pipe is extendable and contractable to be connected to an end of the inner pipe inside the outer pipe. A simple bellows tube is provided.

A recess or a protrusion is formed on each of the outer surface of the inner tube and the inner surface of the outer tube, and the extension tube is prevented from rotating by the recess or the protrusion.

The inner diameter of the bellows tube is larger than the inner diameter of the inner tube.

The bellows tube has a pair of conductive wires embedded therein.

[0024]

Embodiments of the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing an extension tube of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a side sectional view showing an extended state of the extension tube, and FIG. 3 is a side sectional view showing a contracted state of the extension tube. is there. In the drawing, reference numeral 33 denotes a cylindrical outer tube side connection tube, one end of which is connected to a hose (not shown), and the other end of which is inserted into and fixed to the outer tube 12. 34a is the outer tube side connection tube 33
, A cylindrical bellows connection portion formed on the inner tube 11, 34b a telescopic bellows tube formed with two spiral peaks and troughs, And the bellows connecting portion 34a, the bellows connecting portion 34
b is inserted and fixed.

Reference numeral 36 denotes a pair of hard steel wires buried along the helix on the mountain-side outer peripheral portion of the bellows tube 35, which maintains the strength of the bellows tube 35. One end of the hard steel wire 36 is conductively connected to an electric wire connected to the electrode pin 27. In addition, electrode pin 2
Reference numeral 7 denotes an outer connection pipe cover which is disposed above the outer pipe connection section 33 and 37 is screwed to the upper portion of the outer pipe connection section 33 so as to cover the electrode pins 27.

Reference numeral 38 denotes an electric wire wiring groove formed on the outer peripheral surface of the inner tube 11 toward the longitudinal direction of the inner tube 11.
9 are inserted. Reference numeral 41 denotes a lock plate which is welded and fixed to the outer peripheral surface of the inner tube 11 so as to cover the electric wire wiring groove 38, and has a plurality of lock grooves 19.

Reference numeral 42 denotes an inner tube-side connection tube inserted into the other end of the inner tube 11, and a latch 43 and a latch spring 44 for attaching and detaching an electrode plate 39 and an electric suction tool (not shown) are provided on the upper surface. Have been. Reference numeral 45 denotes an inner connection pipe cover that is screwed to the upper portion of the inner pipe side connection pipe 42 so as to cover the electrode plate 39, the latch 43, and the latch spring 44.

Reference numeral 46 denotes a detent groove provided on the inner surface of the outer tube 12, which is fitted to the lock plate 41 of the inner tube 11, and
The outer tube 1 and the outer tube 12 are prevented from rotating and can be slid. In addition, the concave portion which is the detent groove 46 formed on the inner surface of the outer tube 12 and the protrusion indicating the lock plate 41 formed on the outer surface of the inner tube 11 are not limited to this configuration. May be formed, and a concave portion slidably fitted to the protrusion may be separately provided on the outer surface of the inner tube.

Reference numeral 47 denotes a lock hole formed on the inner tube 11 side of the outer tube 12, reference numeral 48 denotes a stopper hole, and the lock piece 18 of the telescopic lock button 16 passes through the lock hole 47 and the inner tube 1
It is inserted into one lock groove 19. The expansion and contraction of the inner tube 11 and the outer tube 12 are locked by lock pieces 18 urged by a coil spring 19.

Reference numeral 49 denotes a lock cover, reference numeral 50 denotes a retaining piece provided on the lock cover 49, reference numeral 51 denotes a stopper groove formed in the longitudinal direction of the inner tube 11, and the lock cover 49 holds the telescopic lock button 16 and Retaining piece 5
0 penetrates the stopper hole 48 of the outer tube 12 and is inserted into the stopper groove 51 to prevent the inner tube 11 from coming off.

Next, the operation of the extension pipe 10 according to the present invention will be described. The lock piece 18 of the telescopic lock button 16 is fitted in the lock groove 19 of the inner pipe 11 by the coil spring 17, and the expansion and contraction of the inner pipe 11 and the outer pipe 12 are locked. When the telescopic lock button 16 is pressed, the lock piece 20 comes out of the lock groove 19 and can be expanded and contracted.
The inner tube 11 does not fall out of the outer tube 12 because 0 is fitted in the stopper groove 51. Further, as shown in FIG. 3, since a plurality of lock grooves 19 are provided on the axis of the inner pipe 11, the length of the extension pipe 10 can be adjusted as desired. The bellows tube 35 fixed between the outer tube side connection tube 33 and the inner tube 11 expands and contracts according to the length of the extension tube 10.

The dust sucked from the electric suction tool (not shown) is transferred from the inner pipe side connection pipe 42 to the inner pipe 11, the bellows pipe 35,
It passes through the outer pipe side connection pipe 33 and is captured by a dust collection bag via a hose (not shown). Since there is no gap in the dust flow path of the extension tube 10 regardless of the length of expansion and contraction, no air leakage occurs and the dust absorbing force does not decrease.

Next, the power supply path will be described. Electric power supplied from the cleaner body through a hose (not shown) is applied to the hard steel wire 3 spirally wound around the electrode pin 27 and the bellows tube 35.
6, the electric power is supplied from the inner conduit 40 and the electrode plate 39 to the motor in the electric suction tool (not shown). Regardless of the extension length of the extension tube 10, stable power supply can be reliably performed at both ends of the extension tube 10.

[0034]

The extension tube of the vacuum cleaner according to the present invention has a bellows tube which can be extended and contracted inside the outer tube and the bellows tube is connected to the end of the inner tube, so that the extension tube can be freely extended and contracted. In addition, there is no air leakage in the dust flow path, and there is no reduction in dust absorption performance.

Further, since the inner tube and the outer tube are prevented from rotating, a twisting force is not applied to the bellows tube, so that the life of the bellows tube can be prevented from being shortened due to collapse and deformation of the bellows portion.

Further, since the inside diameter of the bellows is made larger than the inside diameter of the inner tube, the wind path resistance by the bellows tube can be reduced, and dust can be prevented from being caught by the peaks and valleys of the bellows tube.

Further, since a pair of conductive wires are buried in the bellows tube, a stable power supply is possible regardless of the expansion and contraction of the extension tube, and the conductors do not overlap on the cross section. The outer diameter of the tube can be reduced, making it easy to use.

[0038]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an extension pipe of a vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing an extended state of an extension tube of the vacuum cleaner according to the embodiment of the present invention.

FIG. 3 is a side sectional view showing a contracted state of an extension pipe of the vacuum cleaner according to the embodiment of the present invention.

FIG. 4 is a perspective view of a conventional vacuum cleaner.

FIG. 5 is a longitudinal sectional view of a conventional extension pipe.

FIG. 6 is a cross-sectional view of a conventional extension pipe.

FIG. 7 is a side sectional view showing a storage state of a conventional extension tube.

FIG. 8 is a sectional view of an inner pipe of a conventional extension pipe.

FIG. 9 is a side sectional view of a connection portion of an extension pipe of a conventional vacuum cleaner.

[Explanation of symbols]

1 Vacuum cleaner main body, 5 hose, 7 electric suction tool, 8 rotary cleaning body, 9 motor, 10 extension pipe, 11 inner pipe, 1
2 outer pipe, 34a, 34b bellows connection part, 35 bellows pipe, 36 hard steel wire, 41 lock plate, 46 detent groove, 52 piano wire, 53 electric wire.

Claims (4)

[Claims] 1. An extendable extension tube in which an inner tube and an outer tube are slidably arranged, an electric suction device connected to one end of the extension tube, and an electric suction device arranged on the extension tube. A vacuum cleaner comprising: a conductor that supplies electric power; wherein the extension pipe is provided with an extendable bellows pipe connected to an end of an inner pipe inside the outer pipe. Machine. 2. The vacuum cleaner according to claim 1, wherein a concave portion or a protrusion is formed on each of the inner tube outer surface and the outer tube inner surface, and the extension tube is prevented from rotating by the concave portion or the protrusion. 3. The vacuum cleaner according to claim 1, wherein an inner diameter of the bellows tube is larger than an inner diameter of the inner tube. 4. The vacuum cleaner according to claim 1, wherein a pair of conductive wires are embedded in the bellows tube.