JPH10201686A - Extension pipe for vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid troubles regarding cleaning operability and to provide an excellent assembling property. SOLUTION: An extension pipe includes an outer pipe 35, a guide element 38 secured to the end of the outer pipe 35, an inner pipe 36 sliding within the guide element 38 and having a plurality of locking recesses 39, and a locking element 41 rotatably journalled to the guide element 38 and having its claw part 43 inserted into the locking recesses 39 by the force of a spring 41; the center point 50 of the rotation axis of the locking element 41 is located on the same axis as the outer pipe 35, so that even if a force to contract the inner pipe 36 works from the outside, no force rotating the locking element 41 is generated, with the result that a sufficient holding force can be secured to push in or draw out the inner pipe 36. Because of a small number of part items, the extension pipe is easy to assemble.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art An extension pipe of a conventional vacuum cleaner is shown in FIG.
An extension pipe having the structure shown in FIG. 13 has been put to practical use. In the figure, reference numeral 1 denotes a telescopic extension tube comprising an outer tube 2 and an inner tube 4 which is held by the outer tube 2 via a guide body 3 so as to be extendable and contractible. A plurality of locking recesses 6 for holding in the longitudinal direction are provided. The pin 5
Is a holder 7 that slides on the outer surface of the guide body 3 in the axial direction.
Urges the inner tube 4 to hold the inner tube 4 in the longitudinal direction.

The guide member 3 is provided with a locking member 9 which is rotatably supported and urges the holding member 7 in the direction of a hose (not shown) by the compressive force of a spring 8. When the button 10 of the locking body 9 is pressed, the locking body 9 rotates, and the operating unit 11 urges the holding body 7 in the direction of a floor nozzle (not shown). When the space 7 moves, the space 12 moves onto the pin 5, and the pin 5 moves in the direction opposite to the inner tube 4, whereby the engagement with the inner tube 4 is released, and the inner tube 4 is moved. It was configured to be slidable.

[0004] Further, in assembling, after inserting the guide body 3 from the tip of the outer tube 2, a cover body 13 is welded and fixed to the side surface of the outer tube 2, and the rib 14 locks the guide body 3. Thus, the outer tube 2 and the guide body 3 are held.

[0005]

However, in the above configuration,
In order to lock the inner tube 4, six parts of the guide body 3, the pin 5, the holding body 7, the spring 8, the locking body 9, and the cover body 13 are required, and the number of parts is large. Body 13 and outer tube 2
Requires a welding step, and there is a problem that assembly is difficult and costly.

Further, since the pin 5 is pressed and held against the inner tube 4 by the urging force of the spring 8, when the impact force is applied to the inner tube 4, the pin 5 is released and released. When the floor nozzle collides with a wall or the like during the cleaning work, the extension pipe is likely to shrink.

[0007] In view of the above problems, the present invention is easy to assemble.
It is another object of the present invention to provide an extension pipe of a vacuum cleaner which does not impair cleaning workability.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method in which a plurality of locking portions provided on an inner tube are locked by a locked portion of a locking member rotatably provided on an outer tube. The force for expanding and contracting the inner pipe from the outside by locking and forming the contact point of the locked part of the locking part and the center point of the rotation axis of the locking body on substantially the same line in the axial direction of the outer pipe. Moment to rotate the locking body does not occur even if the work works, and a functionally simple push button operation can secure sufficient holding force against pushing or pulling out of the inner tube, so that more convenient electric cleaning Machine extension pipes can be provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
An outer tube, a guide body fixed to the inner surface of the outer tube tip, an inner tube slidable inside the guide body and having a plurality of locking portions in an axial direction, and a rotatably supported pivot on the guide body. A locking member that presses a locked portion fitted into one of the locking portions by the bias of a spring to lock the inner tube to the outer tube. The contact point of the part and the center point of the rotation axis of the locking member are arranged on substantially the same line in the axial direction of the outer tube. In order to lock the inner tube, three guide members, locking members and springs are used. Since only parts need be used, the number of parts is small, the assembly can be easily performed, and the contact point of the locked part of the locking part and the rotation axis center point of the locking body are on the same line in the axial direction of the outer tube. Even if a force to expand and contract the inner tube acts from outside, no force to rotate the locking body is generated, and the inner tube is pushed or pulled by a simple push button operation. Those that can ensure a sufficient holding force to put out.

The invention according to a second aspect of the present invention is characterized in that the guide body has a locking claw on the outer surface thereof and a concave portion or an opening for locking the locking claw near the distal end of the outer tube. The guide body is fixed to the outer tube by inserting the body and the locking claw and the concave portion or the opening are locked. When the extension tube is assembled, the locking member / spring is set from the tip of the outer tube. Since it is only necessary to insert the guide body, it is possible to assemble more easily.

According to a third aspect of the present invention, a projection is provided on the push button portion of the locking body, and when the guide body is inserted at the time of assembling the extension tube, the spring causes the locking body to be in the outer tube. Although it comes to slide in the state of being urged to the surface, since only the convex body or rib of the push button slides on the inner surface of the outer tube, no scratch is generated on the surface of the push button by sliding, Aesthetics can be kept sufficiently.

According to a fourth aspect of the present invention, there is provided a locking member, comprising: an inclined surface A which becomes closer to the rotation axis in the outer tube axis direction and becomes farther from the rotation axis in the outer tube vertical direction; The left and right portions of the engaging body through hole of the outer tube are provided with an inclined surface B which is further away from the rotation axis in the outer tube vertical direction as approaching the rotation axis in the outer tube axial direction, The inclined surface A and the inclined surface B
When the contact is made, the locked portion of the locking body rotates in a direction away from the locking portion, and a shocking compressive load acts on the inner pipe due to a collision between the floor nozzle and the wall during the cleaning operation. When the locking member moves to the hose side by the play of the rotation axis of the guide body, the inclined surface A and the inclined surface B come into contact with each other, and the locking member is moved in a direction to separate the locked portion from the locking portion. Due to the rotation, the impact force does not directly act on the locking body, and the locking body or the inner tube can be prevented from being damaged.

According to a fifth aspect of the present invention, when the locking member slightly moves, the locking member comes into contact with the inner surface of the locking member through hole of the outer tube, and the floor nozzle and the floor nozzle during the cleaning operation are connected. When an impact compressive load is applied to the inner pipe due to a collision of a wall or the like, the locking body moves toward the hose side by the play of the rotating shaft of the locking body and the guide body,
Since the outer tube supports the impact force acting on the locking body by coming into contact with the inner surface of the locking body through hole of the outer tube, the damage of the locking body can be prevented.

According to a sixth aspect of the present invention, there is provided a play in the longitudinal direction of the extension pipe provided on the outer tube and the guide body, and when the packing of the guide body is compressed, the guide body slightly moves, and the locking body is provided. The gasket comes into contact with the inner surface of the locking body through hole of the outer tube, and when a shocking compressive load acts on the inner tube due to a collision between a floor nozzle and a wall during cleaning work, the packing on the hose side is compressed. Then, the guide body / locking body moves to the hose side, the locking body and the inner surface of the locking body through hole of the outer tube come into contact with each other, and the outer tube supports the impact force acting on the locking body. The stop body can be prevented from being damaged.

[0015]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. First, the overall configuration of the vacuum cleaner will be described with reference to FIG. In the figure, one end of a hose 32 with a built-in conductive wire is connected to a suction port 31 of a cleaner body 30 having a built-in electric blower (not shown), and a hand operation unit 3 provided on the other end side.
3 controls the operation of the electric blower in the cleaner main body 30.

An extendable extension tube 34 is provided at the hand operation unit 33.
The extension tube 34 is composed of an outer tube 35 connected to the hand operation unit 33 side, and an inner tube 36 inserted movably in the outer tube 35 in the axial direction. The end is connected to the floor nozzle 37.

Next, a detailed configuration of the extension tube 34 will be described with reference to FIGS. A cylindrical guide body 38 is inserted into the inner surface of the outer tube 35 on the floor nozzle 37 side, and an inner tube 36 having a plurality of locking recesses 39 in the axial direction is slidably provided on the inner surface of the guide body 38. ing. A locking body 41 is pivotally supported on the guide body 38 so as to be rotatable about a center point 40,
Due to the urging force of a spring 42 provided between the guide body 38 and the locking body 41, the claw 43 is inserted into one of the locking recesses 39 to hold the inner tube 36 in the axial direction. . Further, the contact point 44 of the locking concave portion 39 and the claw portion 43 and the center point 40 are formed on the same line in the longitudinal axis direction of the extension tube 34, and a pushing or pulling force acts on the inner tube 36. At this time, the force for rotating the locking body 41 does not work, and the insertion of the claw 43 and the locking recess 39 does not come off, so that the inner tube 36 can be sufficiently held.

At one end of the outer tube 35 on the side of the hand operation unit 33,
A fitting portion 45 fitted to an end of the hand operation portion 33 is provided, and a floor nozzle 3 is provided at an end of the inner tube 36 on the side opposite to the outer tube 35.
A connecting portion 46 for connecting the inner tube 7 to the inner tube 36 is provided. 47 is a packing disposed on the outer periphery of the inner tube 36 to maintain the airtightness between the inner wall of the outer tube 35 and the inner tube 36, and 48 is a stopper, which is a stopper.
Is pulled out to the longest, the projection 49
To prevent the inner tube 36 from coming off.

The operation of the above configuration is as follows.
By inserting the claw portion 43 of the locking body 41 into the locking concave portion 39, the axial holding of the inner tube 36 is sufficiently ensured, and it is possible to prevent the extension tube 34 from being shortened during the cleaning work and becoming difficult to work. The inner tube 36 can be operated by a simple push button operation.
Can be adjusted, and the contact point 44 and the center point 40 of the locking concave portion 39 and the claw portion 43 are on the same line in the longitudinal axis direction of the extension tube 34. Alternatively, even if a pull-out force is applied, the force for rotating the locking member 41 does not work, and the insertion of the claw portion 43 and the locking concave portion 39 does not come off, so that the inner tube 36 can be sufficiently held. In order to hold the inner tube 36, a locking body 41, a guide body 38, a spring 4
Since only two parts (2) are used, the number of parts is small and assembly can be performed more easily.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 6A is a cross-sectional view of a portion where the guide body 38 is inserted into the outer tube 35, and a locking claw 50 provided on an outer periphery of the guide body 38 is inserted into a locking hole 51 provided in the outer tube 35. By locking, the guide body 38 is fixed to the outer tube 35, and the guide body 38 is prevented from falling out of the outer tube 35.

The operation of the above configuration is as follows.
When assembling the extension tube 34, it is only necessary to insert the guide body 38 on which the locking body 41 and the spring 42 are set from the tip of the outer tube 35 and insert and lock the locking claw 50 into the locking hole 51.
It is easier to assemble than a method of securing with screws or the like.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 6A is a cross-sectional view of a portion where the guide body 38 is inserted into the outer tube 35.
A convex body 53 is provided.

The operation of the above configuration is as follows.
When assembling the extension tube 34, the guide body 38 on which the locking body 41 and the spring 42 are set is inserted from the distal end of the outer tube 35. At this time, the locking body 41 is moved by the urging force of the spring 42. Pushed outward, the outer surface of the push button portion 52 of the locking body 41 is pressed against the inner surface of the outer tube 35 and slides. However, since the outer surface of the push button portion 52 is provided with the convex body 53, Only the tip of the convex body 53 slides on the inner surface of the outer tube 35, so that the surface of the push button 52 is not scratched by the sliding, and a satisfactory appearance can be maintained.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 9 is a cross-sectional view of a portion in which the guide body 38 is inserted into the outer tube 35.
An inclined surface A54 is formed on the left and right sides of the outer tube 35 so as to be closer to the center point 40 in the axial direction of the outer tube 35 and farther from the center point 40 in the vertical direction of the outer tube 35.
The inner surface of the through hole of the locking body 41 facing the inclined surface A54 is positioned closer to the center point 40 in the axial direction of the outer tube 35, and the center point 40 is perpendicular to the outer tube 35.
A farther inclined surface B55 is formed. When the inclined surface A54 comes into contact with the inclined surface B55, the claw 43
The locking body 41 rotates in the direction in which the locking recesses 39 are separated from each other, that is, in the direction of the arrow A shown in FIG.

The operation of the above configuration is as follows.
When the floor nozzle 37 collides with the wall during the cleaning operation and a shocking compressive load is applied to the inner pipe 36 in the direction of the outer pipe 35, an impact force acts on the locking body 41 through the locking recess 39, and The direction in which the locking portion 41 slightly moves backward of the extension tube 34 by the play of the stop body 41 and the guide body 38 and the inclined surface A54 and the inclined surface B55 come into contact with each other, so that the claw portion 43 and the locking concave portion 39 are separated from each other. Then, the locking body 41 is rotated, the holding of the inner tube 36 is released, and it is possible to prevent the extension pipe from becoming unusable such as the damage of the locking body 41.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 10 is a cross-sectional view of a portion where the guide body 38 is inserted into the outer tube 35. When the locking body 41 is slightly moved to the rear of the extension pipe 34 by the play of the locking body 41 and the guide body 38, the locking is performed. Body 4
The tip of the push button portion 52 is configured to come into contact with the end 32b of the outer tube 35 on the hose 32 side of the through hole 35a of the locking body 41.

The operation of the above configuration is as follows.
When the floor nozzle 37 collides with the wall during the cleaning operation and a shocking compressive load is applied to the inner pipe 36 in the direction of the outer pipe 35, an impact force acts on the locking body 41 through the locking recess 39, and The locking body 41 slightly moves rearward of the extension pipe 34 by the play of the stop body 41 and the guide body 38, and the push button 52 of the locking body 41
The tip comes into contact with the end 32b on the hose 32 side of the through hole 35a of the locking member 41 of the outer tube 35, and the shocking compressive load applied to the inner tube 36 is released through the locking member 41. Tube 3
5 to prevent problems such as breakage of the locking body 41 and shrinkage of the inner tube 36.

Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 11A is a sectional view of a portion where the guide body 38 is inserted into the outer tube 35. When the locking body 41 is forcibly urged toward the hose 32, only the bending allowance 56 of the packing 47 is used. Locking body 4
1 moves to the rear of the extension pipe, and the push button 52
The distal end is configured to come into contact with the end 32b on the hose 32 side of the through hole 35a of the locking body 41 of the outer tube 35.

The operation of the above configuration is as follows.
When the floor nozzle 37 collides with the wall during the cleaning operation and a shocking compressive load is applied to the inner pipe 36 in the direction of the outer pipe 35, an impact force acts on the locking body 41 through the locking recess 39, and the packing 47. The locking body 41 moves to the rear of the extension tube 34 by the bending margin 56 of the outer tube 3.
The impact compressive load applied to the inner tube 36 by contact with the end 32b of the through hole 35a of the locking member 41 at the hose 32 side is retained by the outer tube 35 through the locking member 41. Therefore, problems such as breakage of the locking body 41 and shrinkage of the inner tube 36 do not occur.

[0030]

As is apparent from the above embodiment, according to the first aspect of the present invention, the locking member rotatably provided on the guide body for holding the inner tube in the axial direction. Is pressed into the locking concave portion of the inner tube by the urging force of the spring, and the contact point between the locking concave portion and the locking member and the rotation center of the locking member are arranged on the same line in the longitudinal axis direction of the extension tube. It is possible to provide a structure capable of securing a sufficient holding force even when an impacting push-in / pull-out force acts on the inner tube with the number of parts.

According to the second aspect of the present invention, since the guide is fixed by providing a locking claw on the outer periphery of the guide and inserting and locking into the locking hole of the outer tube, the extension pipe is assembled. At this time, it is only necessary to insert and lock the guide body in which the locking body / spring is set in the outer tube, so that the assembly can be more easily performed.

According to the third aspect of the present invention, since the convex body is provided on the outer surface of the push button portion of the locking body, the guide body on which the locking body and the spring are set during the assembly of the extension pipe can be used. At this time, only the tip of the convex body slides on the inner surface of the outer tube, so that the surface of the push button does not suffer any damage due to the sliding, and a sufficient appearance can be maintained.

According to the invention of claim 4 of the present invention, the inclined surface A is formed rearward of the pivot point of the locking body and becomes farther from the central point toward the central point, and the outer tube is locked. Since the inclined surface B which becomes farther from the center point according to the center point side is formed on the left and right inner surfaces facing the inclined surface A of the body penetrating hole, a shocking pushing force is applied to the inner pipe during the cleaning operation, and the inclined surface A and When the inclined surface B comes into contact, the locking body is rotated in a direction in which the claw portion and the locking concave portion are separated from each other, so that it is possible to prevent the extension pipe from becoming unusable such as breakage of the locking body.

According to the fifth aspect of the present invention, when the locking member is slightly moved rearward of the extension pipe by the amount of play of the guide member,
Because the tip of the push button part comes into contact with the locking body penetration hole of the outer tube,
When a shocking pushing force is applied to the inner pipe during cleaning work,
The impact force comes to be held by the outer tube through the locking body,
Problems such as breakage of the locking body and shrinkage of the inner tube do not occur.

According to the invention of claim 6 of the present invention, when the locking body is urged rearward of the extension pipe, the locking body moves rearward of the extension pipe by the bending allowance of the packing, and the tip of the push button portion is moved. When the inner tube comes into contact with the through hole of the outer tube, the impact force will be held by the outer tube through the stopper when the impact force is applied to the inner tube during cleaning. It does not cause problems such as damage to the body and shrinkage of the inner tube.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an extension pipe for a vacuum cleaner showing a first embodiment of the present invention.

FIG. 2A is a plan view of the extension pipe. FIG. 2B is a cross-sectional view of the extension pipe.

FIG. 3 is a partially broken plan view of an extension pipe for a vacuum cleaner showing a first and a third embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a side view of the vacuum cleaner.

FIG. 6A is a sectional view of a main part of an extension pipe for a vacuum cleaner showing a second and a third embodiment of the present invention. FIG. 6B is a side view of a main part of the extension pipe.

FIG. 7 is a sectional view showing a state where the guide body of the extension tube is inserted.

FIG. 8 is a partially broken plan view of an extension pipe for a vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

FIG. 10 is a sectional view of a main part of an extension pipe for a vacuum cleaner showing a fifth embodiment of the present invention.

11A is a sectional view of a main part of an extension pipe for a vacuum cleaner showing a sixth embodiment of the present invention. FIG. 11B is a partial sectional view showing details of a packing part of the extension pipe.

12A is a side view of a conventional extension pipe, and FIG. 12B is a cross-sectional view of the extension pipe.

FIG. 13 is a sectional view of a main part of the extension pipe.

[Explanation of symbols]

 34 extension pipe 35 outer pipe 36 inner pipe 38 guide body 39 locking recess 40 center point 41 locking body 42 spring 43 claw portion 44 contact point 47 packing 50 locking claw 51 locking hole 52 push button portion 53 convex body 54 Inclined surface A 55 Inclined surface B

Continuing from the front page (72) Inventor, Seiko Hayashi, 1006 Kadoma, Kazuma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. An outer pipe, a guide body fixed to the inner surface of the outer pipe tip, an inner pipe slidable inside the guide body and having a plurality of locking portions in the axial direction, A locking body that is movably supported by a shaft and that presses a locked portion fitted to one of the locking portions by the bias of a spring to lock the inner tube to the outer tube; An extension tube for a vacuum cleaner, wherein a contact point of a portion to be locked and a center point of a rotation axis of the locking body are substantially on the same line in the axial direction of the outer tube. 2. A locking claw is provided on an outer surface of the guide body, and a concave portion or an opening for locking the locking claw is provided near a distal end of the outer tube, and the guide body is inserted from the distal end of the outer tube, and the locking claw is provided. The extension pipe for a vacuum cleaner according to claim 1, wherein the guide body is fixed to the outer pipe by engagement of the guide body with the recess or the opening. 3. The extension tube for a vacuum cleaner according to claim 1, wherein a convex portion is provided on the push button portion of the locking body. 4. The locking body has a slope A which becomes farther from the rotation axis in a direction perpendicular to the outer tube as it approaches the rotation axis in the outer tube axial direction, and the locking body through hole of the outer tube. The left and right portions are provided with an inclined surface B that is further away from the rotation axis in the outer tube vertical direction as the approach tube approaches the rotation axis in the outer tube axis direction, and the inclined surface A and the inclined surface B are provided. 4. A contacted part of the locking body pivots in a direction away from the locking part when contacted.
The extension tube for a vacuum cleaner according to any one of claims 1 to 6. 5. The extension pipe for a vacuum cleaner according to claim 1, wherein when the locking body slightly moves, the locking body contacts an inner surface of the locking body through hole of the outer tube. 6. An outer tube and a guide body are provided with play in the longitudinal direction of the extension pipe, and when the packing of the guide body is compressed, the guide body slightly moves, and the locking body penetrates the locking body of the outer pipe. The extension pipe for a vacuum cleaner according to any one of claims 1 to 5, which contacts an inner surface of the hole.