JPH06154138A - Seal device for vacuum cleaner - Google Patents

Abstract

PURPOSE:To ensure sealing property by forming a ring groove on one pipe in a connecting part for connecting the connecting pipe of a hose to an extension pipe in such a manner as to be attachable and removable, and installing a packing having a tongue part and a ring recessed part thereto. CONSTITUTION:In a connecting part between the connecting pipe 3 of a right- handed hose and a lefthanded extension pipe 4, a ring groove 10 is formed on an insert part 7 formed on the extension pipe 4 to be fitted into the connecting pipe 3, and a packing 11 consisting of an elastic material such as synthetic rubber is installed into the ring groove 10. The packing 11 has a tong part 12 having a bore diameter smaller than the connecting pipe 3 bore diameter and elastically making contact with the inner surface of the connecting pipe 13, and on the outer surface, a sensitive recessed part 13 is formed in the position opposite to the tong part 12, whereby the vicinity of the tong part 12 becomes a thin part 14. The tongue part 12 is deformed on the right by the negative pressure acting at driving a cleaner, and makes contact with the connecting pipe 3 inner surface, whereby high sealing property is exhibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved sealing device for connecting extension pipes of an electric vacuum cleaner, connecting pipes of suction tools and connecting pipes of extension pipes, connecting pipes of hoses and extension pipes, and the like. Regarding

[0002]

2. Description of the Related Art Hitherto, as a sealing device for a connecting portion between pipes of this kind, Japanese Patent Laid-Open No. 1-293834 (A47L 9/24) has been known. In this sealing device, a packing is mounted in an annular groove formed in one pipe, and a tongue portion formed in the packing is elastically brought into contact with the other pipe. However, if the amount of elastic contact between the tongue and the pipe is increased to improve the sealing performance between the pipes, or if the amount of elastic contact between the tongue and the pipe is increased due to dimensional error during manufacturing, The frictional resistance of the tongue becomes large, making it difficult to attach and detach the pipe.In addition, in extreme cases, the friction between the pipe and the tongue causes the packing to rotate as the pipe is attached and detached, and the packing is caught between the pipes for attachment and detachment. There were times when you couldn't.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a sealing device capable of improving the sealing property without impairing the detachability of pipes.

[0004]

The first means of the present invention is to:
An annular groove is formed in one pipe and a packing is attached to the annular groove.The packing forms a tongue portion that elastically contacts the other pipe, and a tongue is formed on the surface of the base portion that abuts the annular groove. It is characterized in that an annular recess is formed so as to face the portion.

A second means of the present invention is to form an annular groove in one pipe and mount a packing in the annular groove, the packing forming a tongue for elastic contact with the other pipe. An annular recess is formed at a position facing the tongue of the annular groove.

A third means of the present invention is to form an annular groove in one pipe and mount a packing in the annular groove, the packing forming a tongue for elastic contact with the other pipe. An annular recess is formed on the surface of the base that contacts the annular groove so as to face the tongue, and the annular recess is communicated with the outside air.

According to a fourth aspect of the present invention, an annular groove is formed in one pipe and a packing is mounted in the annular groove, and the packing forms a tongue portion that elastically contacts the other pipe. A concave portion is formed at a position facing the tongue portion of the annular groove, and the concave portion is communicated with outside air.

[0008]

According to the structure of claim 1 of the present invention, in the cleaning state, one of the spaces surrounded by the packing, the tongue and the pipe is in communication with the pipe, so that a negative pressure is generated, and the packing, the tongue and the pipe are separated from each other. Since the other enclosed space communicates with the outside air, the tongue is deformed in the inner diameter direction, the tongue comes into strong contact with the inner surface of the pipe, and reliable sealing is performed. When attaching or detaching the pipe, a force is applied by pushing the tongue downward by sliding the pipe, and the packing deforms in the outer diameter direction to reduce the contact of the tongue with the inner surface of the pipe. The operation can be performed easily.

According to the structure of claim 2 of the present invention, in the cleaning state, one of the spaces surrounded by the packing, the tongue and the pipe communicates with the pipe, so that a negative pressure is generated, and the packing, the tongue and the pipe are separated from each other. Since the other enclosed space communicates with the outside air, the tongue is deformed in the inner diameter direction, the tongue comes into strong contact with the inner surface of the pipe, and reliable sealing is performed. When attaching or detaching the pipe, a force is applied by pushing the tongue downward by sliding the pipe, and the packing deforms in the outer diameter direction to reduce the contact of the tongue with the inner surface of the pipe. The operation can be performed easily.

According to the third aspect of the present invention, in the cleaning state, one of the spaces surrounded by the packing, the tongue and the pipe communicates with the pipe, so that a negative pressure is generated, and at the same time, the packing, the tongue and the pipe. The other space surrounded by and communicates with the outside air, and the ring-shaped recess of the packing communicates with the outside air through the ventilation passage. Strong contact and improved sealability. Also, when attaching or detaching the pipe, a force is applied by pressing the tongue downward by sliding the pipe, and the packing easily deforms in the outer diameter direction to prevent the tongue from contacting the inner surface of the pipe. The size can be reduced and the attachment / detachment operation can be easily performed.

According to the structure of claim 4 of the present invention, in the cleaning state, one of the spaces surrounded by the packing, the tongue portion and the pipe communicates with the pipe, so that a negative pressure is generated, and at the same time, the packing, the tongue portion and the pipe. Since the other space surrounded by and communicates with the outside air, and the annular recess of the packing communicates with the outside air through the ventilation passage, the tongue can be easily deformed in the inner diameter direction, and the tongue can be more easily attached to the inner surface of the pipe. Strong contact and improved sealability. Also, when attaching or detaching the pipe, a force is applied by pressing the tongue downward by sliding the pipe, and the packing easily deforms in the outer diameter direction to prevent the tongue from contacting the inner surface of the pipe. The size can be reduced and the attachment / detachment operation can be easily performed.

[0012]

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 5, reference numeral 1 denotes a hose which is detachably connected to a cleaner body (not shown) and has a connection pipe 3 having a handle 2. Reference numeral 4 denotes two extension pipes that are detachably connected to the connection pipe 3 of the hose 1.
The extension pipes 4 of the book are formed in the same shape. Reference numeral 5 is a floor suction tool having a connection pipe 6, and the connection pipe 6 is detachably connected to the extension pipe 4.

The details of the connection between the connection pipe 3 of the hose 1 and the extension pipe 4, the connection between the extension pipes 4 and the connection between the extension pipe 4 and the connection pipe 6 of the floor suction tool 5 will be described below. Since each connecting portion has the same structure, only the connecting portion between the connecting pipe 3 and the extension pipe 4 of the hose 1 will be described, and the description of the other connecting portions will be omitted.

In FIGS. 1 to 4, reference numeral 7 denotes an insertion portion formed on the extension pipe 4, which is integrally formed with an engaging projection 8.
The hook 9 provided on the connection pipe 3 of the hose 1 is engaged with the engaging projection 8 to integrate the hose 1 and the extension pipe 3. Reference numeral 10 denotes an annular groove formed in the insertion portion 7, which is a packing made of an elastic material such as synthetic rubber.
The packing 11 has a smaller inner diameter than the outer diameter of the annular groove 10. Reference numeral 12 is a tongue portion formed in a substantially central portion of the inner surface of the packing 11, and the inner diameter of the tongue portion 12 is formed to be smaller than the inner diameter of the connecting pipe 3.
12 is elastically contacted with the inner surface of the connecting pipe 3. Reference numeral 13 denotes an annular recess formed on the outer surface of the packing 11 at a position facing the tongue 12, and the annular recess 13 forms a thin portion 14 near the tongue 12.

When the extension pipe 4 is connected to the hose 1 shown in FIG. 1 and the cleaner main body is not driven, the tongue portion 12 elastically contacts the inner surface of the connection pipe 3 and the reaction force causes packing 11 The thin-walled portion 14 is slightly deformed in the outer shape direction.

When the cleaner body is driven, as shown in FIG. 2, the space on the right side in FIG. 2 among the spaces surrounded by the packing 11, the tongue 12 and the connection pipe 3 communicates with the connection pipe 3. Negative pressure is generated, and the packing 11 and tongue on the left side in FIG.
Since the space surrounded by 12 and the connection pipe 3 communicates with the outside air, the tongue 12 is deformed to the right in FIG. 2, the thin portion 14 is deformed in the inner diameter direction, and the tongue 12 is further formed on the inner surface of the connection pipe 3. Strong contact and improved sealability.

When the extension pipe 4 is attached to or detached from the connection pipe 3 of the hose 1, a force is applied by sliding the extension pipe 4 in a direction of pressing the tongue portion 12 downward, so that the thin portion
Since 14 is deformed in the outer diameter direction, the contact of the tongue portion 12 with the inner surface of the connection pipe 3 is reduced, and the attachment / detachment operation can be easily performed.

As shown in FIG. 6, the packing 11
In addition, an appropriate number of air passages 15 communicating with the annular recess 13 may be formed. In this configuration, the tongue portion 12 makes stronger contact with the inner surface of the connection pipe 3 by utilizing the pressure difference when the cleaner body is driven,
The sealing property can be further improved. Also, the annular recess
Since 13 communicates with the outside air through the ventilation passage 15, the air in the annular recess 13 flows out through the ventilation passage 15 when the thin portion 14 is deformed in the outer diameter direction when the extension pipe 4 is attached or detached. However, the thin portion 14 can be easily deformed.

Although the annular recess 13 is formed in the packing 11 in the above embodiment, the annular recess 13 may be formed in the annular groove 10 as shown in FIG. Also in this configuration, FIG.
The same effect as the embodiment shown in FIG. 4 is obtained.

Further, as shown in FIG. 8, an appropriate number of ventilation passages 15 communicating with the annular recess 13 formed in the annular groove 10 may be formed in the insertion portion 7 of the extension pipe 4. With this configuration, similarly to the embodiment of FIG. 6, the tongue portion 12 makes stronger contact with the inner surface of the connection pipe 3 by utilizing the pressure difference when the cleaner body is driven, and the sealing performance can be further improved. Also, the annular recess 13
Communicates with the outside air through the ventilation passage 15, so when the packing 11 is deformed in the outer diameter direction during the attachment / detachment operation of the extension pipe 4, the air in the annular recess 13 flows out through the ventilation passage 15 to the outside. The deformation of the packing 11 can be facilitated.

In each of the above embodiments, the packing 11 is attached to the insertion portion 7, but the packing may be attached to the pipe into which the insertion portion 7 is inserted.

[0023]

According to the constitution of claim 1 of the present invention, since the annular recess is formed in the packing so as to face the tongue portion, the tongue portion can be closely attached to the pipe due to the pressure difference in the cleaning state. The sealability is not impaired, the packing is easily deformed in the outer shape direction, and the operability of attaching and detaching the pipe can be improved.

According to the second aspect of the present invention, since the annular concave portion is formed in the annular groove for mounting the packing so as to face the tongue portion, the tongue portion can be brought into close contact with the pipe due to the pressure difference in the cleaning state. As a result, the sealing performance is not impaired, the packing is easily deformed in the outer shape direction, and the pipe operability is improved.

According to the third aspect of the present invention, since the annular recess is formed in the packing so as to face the tongue and the annular recess is communicated with the outside air, the tongue is opened due to the pressure difference in the cleaning state. The pipe can be firmly adhered to the pipe, the sealing property can be improved, and the packing can be easily deformed in the outer shape direction, so that the detachability of the pipe can be improved.

According to the structure of claim 4 of the present invention, since the annular recess is formed in the annular groove for mounting the packing so as to face the tongue and the annular recess is communicated with the outside air, the cleaning is performed in the cleaning state. Due to the pressure difference, the tongue portion can be more closely attached to the pipe, the sealing performance can be improved, and the packing can be easily deformed in the outer shape direction, so that the detachability of the pipe can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a non-use state showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing the cleaning state.

FIG. 3 is an enlarged cross-sectional view of an essential part showing a detached state of the pipe.

FIG. 4 is an enlarged sectional view of the main part.

FIG. 5 is a side view showing a main part of the same electric vacuum cleaner.

FIG. 6 is an enlarged sectional view of a main part of the other embodiment.

FIG. 7 is an enlarged sectional view of a main part of the other embodiment.

FIG. 8 is an enlarged sectional view of a main part of the other embodiment.

[Explanation of symbols]

 1 Hose 3 Connection pipe 4 Extension pipe 5 Floor suction tool 6 Connection pipe 10 Annular groove 11 Packing 12 Tongue 13 Annular recess 15 Ventilation path

Claims (4)

[Claims] 1. A packing for connecting pipes such as extension pipes, suction device connection pipes and extension pipes, hose connection pipes and extension pipes detachably connected to each other by forming an annular groove in one pipe and packing. The packing is formed with a tongue portion that elastically contacts the other pipe, and an annular recess is formed on the surface of the base portion that abuts the annular groove so as to face the tongue portion. Sealing device for vacuum cleaner. 2. In a connecting portion for detachably connecting pipes such as extension pipes, suction device connection pipes and extension pipes, hose connection pipes and extension pipes, etc., one pipe is formed with an annular groove for packing. And the packing forms a tongue that elastically contacts the other pipe, and an annular recess is formed at a position facing the tongue of the annular groove. apparatus. 3. In a connecting portion for detachably connecting pipes such as extension pipes, suction device connection pipes and extension pipes, hose connection pipes and extension pipes, one pipe is formed with an annular groove for packing. The packing forms a tongue that elastically contacts the other pipe, and an annular recess is formed on the surface of the base that contacts the annular groove so as to face the tongue. A sealing device for an electric vacuum cleaner, characterized in that the air is communicated with the outside air. 4. In a connecting portion for detachably connecting pipes such as extension pipes, connecting pipes for suction tools and extension pipes, connecting pipes for hoses and extension pipes, one pipe is formed with an annular groove for packing. And the packing forms a tongue that elastically contacts the other pipe, and a recess is formed at a position facing the tongue of the annular groove so that the recess communicates with the outside air. Characteristic vacuum cleaner sealing device.