JP2008049026A - Telescopic extension pipe and vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic extension pipe capable of sufficiently securing the sealing between an outer pipe and an inner pipe even if the inner diameter of the outer pipe is variable in the axial direction, and a vacuum cleaner equipped with the extension pipe. <P>SOLUTION: The telescopic extension pipe 300 comprises the outer pipe 310; the inner pipe 320 inserted into the outer pipe 310 in such a way that the quantity of insertion is variable; packing 320A provided on the outer peripheral face of the end of the inner pipe 320 on the side to be inserted into the outer pipe 310 for sealing the gap between the inner pipe 320 and the outer pipe 310 while moving inside the outer pipe 310 together with the inner pipe 320; and a pipe guide 315 provided on the inner peripheral face of the end of the outer pipe 310 on the side into which the inner pipe 320 is inserted. The inner diameter B of the pipe guide 315 located at the end of the outer pipe 310 is smaller than the inner diameter A of the part of the outer pipe 310 adjacent to the pipe guide 315. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an expansion / contraction extension tube and a vacuum cleaner, and more particularly to an expansion / contraction extension tube having high sealing performance in an extended state and a vacuum cleaner including the extension tube.

A telescopic extension pipe having an inner pipe and an outer pipe is conventionally known.
For example, in Japanese Patent Application Laid-Open No. 11-32952 (Patent Document 1), a suction pipe for a vacuum cleaner formed by inserting an inner pipe into an outer pipe, which seals between the inner pipe and the outer pipe. What is provided is disclosed.
JP-A-11-32952

  In the suction pipe of Patent Document 1, when the inner diameter of the outer pipe changes in the axial direction, the sealing performance by the seal ring may not be sufficient.

  The present invention has been made in view of the above problems, and an object of the present invention is to sufficiently provide a sealing property between the outer pipe and the inner pipe even when the inner diameter of the outer pipe changes in the axial direction. An object of the present invention is to provide a telescopic extension pipe that can be secured and a vacuum cleaner provided with the extension pipe.

  An expansion / contraction extension pipe according to the present invention is an expansion / contraction extension pipe provided in a vacuum cleaner, and is inserted into an outer pipe, an inner pipe inserted into the outer pipe in a variable amount of insertion, and an outer pipe in the inner pipe. A packing that seals a gap between the inner pipe and the outer pipe while moving in the outer pipe together with the inner pipe, and a side on which the inner pipe is inserted in the outer pipe. A cylindrical member provided on the inner peripheral surface of the end portion, and the inner diameter of the cylindrical member located at the end portion of the outer pipe is smaller than the inner diameter of the portion adjacent to the cylindrical member in the outer pipe. The

  According to the above configuration, by setting the inner diameter of the cylindrical member provided as a separate member at the end of the outer pipe to be small, the sealing performance between the inner pipe and the outer pipe in a state where the expansion / contraction extension pipe is extended is obtained. It can be kept high.

  In the expansion / contraction extension pipe, the cylindrical member has a tapered portion that changes the inner diameter thereof from the inner diameter of the portion adjacent to the cylindrical member in the outer pipe to the inner diameter of the cylindrical member positioned at the end of the outer pipe, The packing is positioned on the taper portion with the expansion / contraction extension tube extended to the maximum.

  By providing the taper portion as described above, it is possible to suppress an excessive increase in sliding resistance between the inner pipe and the cylindrical member. Moreover, since the packing can be deformed so that the packing bites between the cylindrical member and the inner pipe by positioning the packing on the tapered portion, the degree of adhesion between the packing and the cylindrical member is improved. Can do. As a result of the above, it is possible to improve the sealing performance between the inner pipe and the outer pipe in a state where the expansion / contraction extension pipe is extended.

  In the expansion / contraction extension pipe, as one example, the outer pipe and the inner pipe are formed of a resin molded product.

  The vacuum cleaner according to the present invention includes a vacuum cleaner main body, a hose connected to the vacuum cleaner main body, the above-described expansion / contraction extension pipe connected to the hose, and a suction port connected to the expansion / contraction extension pipe.

  Thereby, the vacuum cleaner provided with the expansion-contraction extension pipe | tube with high sealing performance between an inner pipe and an outer pipe is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing performance between the inner pipe and outer pipe in the state which extended the expansion-contraction extension pipe | tube can be improved.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

  FIG. 1 is a view showing a vacuum cleaner including a telescopic extension tube according to an embodiment of the present invention. Referring to FIG. 1, the electric vacuum cleaner 1 includes a cleaner main body 100, an extension hose 200, an expansion / contraction extension pipe 300, and a suction port body 400.

  The extension hose 200 is connected to the cleaner body 100. The expansion / contraction extension pipe 300 is connected to the extension hose 200. The expansion / contraction extension tube 300 can expand and contract in the direction of the arrow DR300. A suction port 400 that sucks in dust on the floor is connected to the extension / contraction extension pipe 300.

  The vacuum cleaner main body 100 includes a negative pressure generating source including a motor and a fan (not shown) that generate negative pressure. The extension hose 200 and the expansion / contraction extension pipe 300 connected to the cleaner body 100 communicate with the negative pressure source. Dust on the floor surface can be sucked from the suction port 400 connected to the expansion / contraction extension pipe 300 by the negative pressure generated by the negative pressure generation source.

  2-4 is sectional drawing of each part of an expansion-contraction extension pipe | tube. Here, FIG. 2 is a cross-sectional view (side cross-sectional view) of a joint portion of two pipes constituting the expansion / contraction extension pipe 300, and FIGS. 3 and 4 are end portions of the expansion / contraction extension pipe 300 on the extension hose 200 side. FIG. 3 is a cross-sectional view (FIG. 3: side cross-sectional view, FIG. 4: top cross-sectional view).

  2 to 4, the expansion / contraction extension pipe 300 is positioned on the side of the suction port 400 with respect to the outer pipe 310 and the outer pipe 310 and is inserted into the outer pipe 310. A lock mechanism 330 that fixes the inner pipe 320, the outer pipe 310, and the inner pipe 320; a lock release button 340 that releases the lock by the lock mechanism 330; The coil spring 350 and the conductor 360 inserted through the coil spring 350 are configured.

  The outer pipe 310 and the inner pipe 320 are formed of a resin molded product. The inner pipe 320 is inserted into the outer pipe 310. As shown in FIG. 2, a pipe guide 315, which is a member different from the outer pipe 310, is attached to the end of the outer pipe 310 on the inlet port 400 side, and the inner pipe 320 is inserted into the pipe guide 315. A packing 320 </ b> A is provided at the tip of the inner pipe 320. By providing the packing 320 </ b> A, it is possible to prevent air from leaking from the joint portion between the outer pipe 310 and the inner pipe 320. Covers 311 and 321 are attached to the outer pipe 310 and the inner pipe 320, respectively. As a result, a separate space is formed in the expansion / contraction extension pipe 300 and is isolated from the passage of dust sucked from the suction port 400. The lock mechanism 330, the coil spring 350, and the conductor 360 are provided in this separate space.

  The lock mechanism 330 fixes the outer pipe 310 and the inner pipe 320. Thereby, the length of the expansion / contraction extension tube 300 is fixed. Here, by pushing the lock release button 340, the lock mechanism 330 is operated via a wire (not shown), and the fixation between the outer pipe 310 and the inner pipe 320 is released. As a result, the outer pipe 310 and the inner pipe 320 are slidable, and the length of the expansion / contraction extension pipe 300 is variable.

  One end of the coil spring 350 is fixed to the end of the outer pipe 310 on the extension hose 200 side. Further, the other end of the coil spring 350 is in a free state. The conductor 360 is a member for transmitting electricity in the axial direction of the extendable extension tube 300. The conductor 360 is electrically connected to the terminal 361. The terminal 361 is electrically connected to a conductive path provided in the extension hose 200 when the expansion / contraction extension pipe 300 is connected to the extension hose 200. As described above, the vacuum cleaner main body 100 and the suction port body 400 are electrically connected via the conductive paths in the extension hose 200 and the expansion / contraction extension pipe 300, and the suction port is supplied by the electric power supplied to the vacuum cleaner main body 100. A motor or the like provided in the body 400 can be driven. The conductor 360 is inserted through the coil spring 350 in the axial direction. As shown in FIG. 4, two coil springs 350 and two conductors 360 are provided so as to be aligned in the width direction of the extension / contraction extension tube 300.

  2 to 4 show a state in which the expansion / contraction extension pipe 300 is most extended. When the expansion / contraction extension pipe 300 is contracted from this state, the inner pipe 320 is pushed into the outer pipe 310 in a state where the lock release button 340 releases the lock mechanism 330. When the amount of insertion of the inner pipe 320 into the outer pipe 310 increases, the tip of the inner pipe 320 comes into contact with the coil spring 350. When the inner pipe 320 is further pushed in from this state, the coil spring 350 is contracted. When the push of the lock release button 340 is released in a state where the coil spring 350 is contracted, the outer pipe 310 and the inner pipe 320 are fixed again by the lock mechanism 330.

  As described above, in the state where the expansion / contraction extension tube 300 is contracted, the coil spring 350 is contracted. When the extension / contraction extension tube 300 is extended from this state, the lock release button 340 is pushed to release the fixation by the lock mechanism 330. Here, since the inner pipe 320 is in contact with the contracted coil spring 350, the inner pipe 320 is attached in the direction in which the expansion / contraction extension pipe 300 is extended by the coil spring 350 when the lock mechanism 330 is released. Be forced. Therefore, even if the inner pipe 320 is not pulled out from the outer pipe 310, the expansion / contraction extension pipe 300 extends.

  As described above, the outer pipe 310 and the inner pipe 320 are formed of a resin molded product. Since the resin molded product has a “draft angle”, the inner diameters of the outer pipe 310 and the inner pipe 320 slightly change in a tapered shape. In the present embodiment, the inner diameter of the outer pipe 310 increases from the extension hose 200 side toward the suction port body 400 side. Therefore, there is a concern that the sealing performance by the packing 320A is lowered as the expansion / contraction extension pipe 300 is extended. The sealing performance by the packing 320 </ b> A affects the suction power of the vacuum cleaner 1. Generally, since the vacuum cleaner 1 is often used in a state where the expansion / contraction extension pipe 300 is extended, it is important to improve the sealing performance by the packing 320A in a state where the expansion / contraction extension pipe 300 is extended.

  In the present embodiment, a pipe guide 315 formed as a separate member is inserted into the end of the outer pipe 310 on the suction port body 400 side. The packing 320A is positioned on the pipe guide 315 in the state where the expansion / contraction extension tube is extended most. The inner diameter (B) of the pipe guide 315 is formed smaller than the inner diameter (A) of the portion adjacent to the pipe guide 315 in the outer pipe 310. Thus, by setting the inner diameter of the pipe guide 315 to be small, it is possible to ensure a high degree of adhesion between the packing 320A and the pipe guide 315 in a state where the expansion / contraction extension pipe 300 is extended. It is possible to improve the suction work rate in a state where is stretched.

  FIG. 5 is an enlarged cross-sectional view showing a joint portion between the outer pipe 310 and the inner pipe 320 in a state where the expansion / contraction extension pipe 300 is most extended.

  Referring to FIG. 5, the inner diameter of pipe guide 315 is changed from the inner diameter (A) of the portion adjacent to pipe guide 315 in outer pipe 310 to the inner diameter (B) of pipe guide 315 located at the end of outer pipe 310. It has a taper portion 315A to be changed. In the present embodiment, the packing 320A is positioned on the tapered portion 315A in the state in which the expansion / contraction extension tube 300 is most extended.

  By providing the tapered portion 315A as described above, it is possible to suppress an excessive increase in sliding resistance between the inner pipe 320 and the pipe guide 315. Further, by positioning the packing 320A on the taper portion 315, the packing 320A can be deformed so that the packing 320A bites between the pipe guide 315 and the inner pipe 320, so that the packing 320A and the pipe guide 315 The degree of adhesion can be improved. As a result of the above, the sealing performance between the inner pipe 320 and the outer pipe 310 in a state where the expansion / contraction extension pipe 300 is extended can be improved.

  As described above, according to the expansion / contraction extension pipe 300 according to the present embodiment, by setting the inner diameter of the pipe guide 315 provided as a separate member at the end portion of the outer pipe 310, the expansion / contraction extension pipe 300 is provided. The sealing performance between the inner pipe 320 and the outer pipe 310 in the stretched state can be kept high.

  The above contents are summarized as follows. That is, the extension / contraction extension pipe 300 according to the present embodiment is provided in the electric vacuum cleaner 1, and includes an outer pipe 310, an inner pipe 320 inserted into the outer pipe 310 in a variable amount of insertion, A packing 320A provided on the outer peripheral surface of the end portion of the pipe 320 on the side inserted into the outer pipe 310, which seals between the inner pipe 320 and the outer pipe 310 while moving in the outer pipe 310 together with the inner pipe 320; And a pipe guide 315 as a “cylindrical member” provided on the inner peripheral surface of the end of the outer pipe 310 on the side where the inner pipe 320 is inserted. As shown in FIG. 2, the inner diameter (B) of the pipe guide 315 located at the end of the outer pipe 310 is formed smaller than the inner diameter (A) of the portion adjacent to the pipe guide 315 in the outer pipe 310.

  Although the embodiment of the present invention has been described above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is the figure which showed the vacuum cleaner containing the expansion-contraction extension pipe | tube which concerns on one embodiment of this invention. It is a sectional side view which shows the junction part of the outer pipe and inner pipe in the expansion-contraction extension pipe | tube which concerns on one embodiment of this invention. It is a sectional side view which shows the structure of the lock release mechanism periphery in the expansion-contraction extension pipe | tube which concerns on one embodiment of this invention. It is an upper surface sectional view showing the structure around the lock release mechanism in the telescopic extension pipe according to one embodiment of the present invention. It is an expanded sectional view which shows the junction part of the outer pipe and inner pipe in the state which extended the expansion-contraction extension pipe | tube which concerns on one embodiment of this invention most.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner, 100 Vacuum cleaner main body, 200 Extension hose, 300 Telescopic extension pipe, 400 Suction port body, 310 Outer pipe, 311 cover, 315 Pipe guide, 315A taper part, 320 Inner pipe, 320A Packing, 321 Cover, 330 Lock mechanism, 340 unlock button, 350 coil spring, 360 conductor, 361 terminal.

Claims (4)

A telescopic extension tube provided in a vacuum cleaner,
An outer pipe,
An inner pipe inserted into the outer pipe in a variable amount of insertion;
Provided on the outer peripheral surface of the end of the inner pipe on the side inserted into the outer pipe, and seals the gap between the inner pipe and the outer pipe while moving in the outer pipe together with the inner pipe. Packing,
A cylindrical member provided on the inner peripheral surface of the end of the outer pipe on the side where the inner pipe is inserted;
An expansion / contraction extension pipe, wherein an inner diameter of the cylindrical member located at an end of the outer pipe is formed smaller than an inner diameter of a portion of the outer pipe adjacent to the cylindrical member. The cylindrical member has a tapered portion that changes its inner diameter from an inner diameter of a portion of the outer pipe adjacent to the cylindrical member to an inner diameter of the cylindrical member located at an end of the outer pipe,
The expansion / contraction extension pipe according to claim 1, wherein the packing is positioned on the tapered portion in a state where the expansion / contraction extension pipe is most extended.   The expansion / contraction extension pipe according to claim 1 or 2, wherein the outer pipe and the inner pipe are made of a resin molded product. The vacuum cleaner body,
A hose connected to the vacuum cleaner body;
The telescopic extension pipe according to any one of claims 1 to 3, connected to the hose;
The vacuum cleaner provided with the suction inlet connected to the said expansion-contraction extension pipe | tube.

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