JPH0793916B2 - Vacuum cleaner connection tube - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connecting pipe for an electric vacuum cleaner, to which a female pipe body and a male pipe body are detachably connected and airtightly connected.

(Prior Art) Conventionally, at a connecting portion of a suction hose, an extension pipe, etc., an electric structure has been adopted in which a female tube body and a male tube body are detachably taper-fitted and are engaged and disengaged by a clamp. Vacuum cleaner connection tubes are known.

Then, in a connection pipe of this type of vacuum cleaner, when a clamp provided on one pipe body is engaged with an engaged portion formed on the other pipe body, a male pipe is formed on the inner peripheral surface of the female pipe body. If the outer peripheral surface of the body is formed so as to be in close contact with the airtightness, when the inner diameter of the female tubular body and the outer diameter of the male tubular body do not fit closely due to variations in size, for example, when the inner diameter of the female tubular body is smaller than the specified dimension. Since the engaging property of the clamp deteriorates, in the prior art, when the clamp engages with the engaged portion, a slight gap is generated between the inner peripheral surface of the female pipe body and the outer peripheral surface of the male pipe body. The structure thus formed is adopted, and the gap absorbs the dimensional variation of the inner and outer diameters and secures the engaging property of the clamp.

However, in the above-described conventional structure, air leakage occurs from the gap between the female pipe body and the male pipe body, so that noise is increased and a loss in suction power also occurs, and the connected female pipe body and Since rattling occurs between male pipes, it is not easy to use. In particular, an electric motor that drives a rotating brush is built into the suction port that is connected to the cleaner body via a hose and an extension pipe, and a power supply line to this electric motor is provided along the hose and the extension pipe from the cleaner body. In an electric vacuum cleaner provided with a detachable connector having a contact portion of a power supply line at a connecting portion such as a detachable hose and extension pipe, between the inner peripheral surface of the female pipe and the outer peripheral surface of the male pipe. There is a risk of rattling due to the gap in the and damage to the connector.

Therefore, in order to eliminate the gap between the female tube and the male tube,
For example, the structure of Japanese Utility Model Publication No. 52-44888, that is, an annular seal member is arranged along the circumferential direction on the inner peripheral surface of the female tube,
A structure is adopted in which the seal member is airtightly adhered to the outer peripheral surface of the male pipe body from the radial direction when the male pipe body is fitted to the female pipe body.

(Problems to be Solved by the Invention) However, the connecting pipe of the electric vacuum cleaner described in Japanese Utility Model Publication No. 52-44888 has the outer peripheral surface of the male pipe and the sealing member when the male pipe and the female pipe are attached and detached. Since it makes circumferential contact with the inner peripheral surface, the frictional load is large, the detachability is poor, and the operability is degraded, resulting in a problem in usability.

In view of such problems, an object of the present invention is to provide a connecting pipe for an electric vacuum cleaner, in which the female tube body and the male tube body have good detachability and airtight connection can be obtained.

(Means for Solving the Problems) A connecting pipe of an electric vacuum cleaner according to the present invention includes a female pipe body and a male pipe which is removably fitted to an inner peripheral side of one end of the female pipe body in the axial direction. A body and a clamp that releasably engages the female pipe body and the male pipe body, and is provided along the circumferential direction on the inner peripheral surface of the female pipe body to fit the female pipe body and the male pipe body. An annular sealing member having a sealing surface on the end face in the mating direction, and an annular abutting surface provided at the tip of the male tubular body and abutting axially on the sealing surface of the sealing member.

(Operation) In the connection pipe of the electric vacuum cleaner of the present invention, an annular seal member is provided on the inner peripheral surface of the female pipe body along the circumferential direction, and the female pipe body and the male pipe of the seal member are provided at the tip of the male pipe body. A ring-shaped abutment surface that abuts from the axial direction is provided on the sealing surface at the end face in the body fitting direction, so the airtightness of the female tube and male tube is maintained when the male tube is fitted to the female tube. In addition to preventing rattling, frictional resistance does not occur between the seal member and the male pipe when the female pipe and the male pipe are attached and detached, and the female pipe and the male pipe can be easily attached and detached. The property is improved.

(Embodiment) Hereinafter, a configuration of an embodiment of a connecting pipe of an electric vacuum cleaner of the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes an extension pipe, and the extension pipe 1 is provided with a suction port body via a hose 2 at a suction port facing a dust collection chamber of a cleaner body having an electric blower (not shown). It is intended to connect and disconnect freely. It should be noted that the suction port body has a built-in rotary brush for scraping dust from a carpet or the like and an electric motor for driving the rotary brush.

The extension pipe 1 has a substantially cylindrical main pipe 3 as shown in FIGS. 1 to 3, and a cord passage 4 is integrally formed on the outer peripheral surface of the main pipe 3 in the axial direction. . In addition, on the inner peripheral surface of one end of the main pipe 3, a cylindrical female pipe body 5 is formed.
The outer peripheral surface of the base end portion of is fitted and fixed by, for example, an adhesive. Then, the female tube body 5 is slightly expanded in diameter from the base end portion toward the tip end.

Further, the inner peripheral surface of the base end portion of the cylindrical first cover body 6 is fitted to the outer peripheral surface of one end portion of the main pipe 3, and is fixed by, for example, an adhesive. The tip end side of the first cover body 6 is formed to have a trumpet-like diameter.

On the other hand, the outer peripheral surface of the base end portion of the male pipe body 7 is fitted to the inner peripheral surface of the other end portion of the main pipe 3 and fixed by an adhesive. The male pipe body 7 is tapered in diameter from the base end portion toward the tip end, and is wrapped around one end of the female pipe body 5 fitted to one end portion of the main pipe 3 to be detachably taperable. It is formed so that it can be fitted. The inner peripheral surface of the base end portion of the cylindrical second cover body 8 is fitted and fixed to the outer peripheral surface of the other end portion of the main pipe 3. The tip end side of the second cover body 8 is formed to have the same diameter as the tip end side of the first cover body 6 and have a large diameter.

In addition, between the female pipe body 5 and the first cover body 6, along the circumferential direction of the female pipe body 5 and the first cover body 6, a clamp 11 having a substantially C-shaped front surface and a leaf spring shape is provided. It is provided. A push button portion 12 is formed in the center of the clamp 11, and the push button portion 12 is formed in the first cover body 6 through a through hole.
It is formed so as to be able to advance and retreat upward from 13. further,
A pair of locking projections 14 are formed on the inner peripheral surface of the clamp 11 so as to be opposed to each other with the center interposed therebetween, and the surfaces of the locking projections 14 that are opposed to each other are inclined toward the ends toward the ends. A tapered portion is formed. In addition, through holes 15 are formed in the female tube body 5 at symmetrical positions with respect to the central axis thereof.
The locking projection 14 is penetrated through 15 so as to be able to move back and forth, and the tip of the locking projection 14 projects inward from the inner peripheral surface of the female pipe body 5.

On the other hand, on the outer peripheral surface of the female tube body 7, locking recesses 16 for engaging and disengaging the locking projections 14 are formed at symmetrical positions with respect to the central axis. In addition, the locking projections 14 of the clamps 11 of the pair of extension pipes 1
When the locking recess 16 and the locking recess 16 are engaged with each other, a slight radial gap C is formed between the inner peripheral surface of the female pipe body 5 and the outer peripheral face of the male pipe body 7, as shown in FIG. The inner diameter of the female body 5 and the outer diameter of the male pipe body 7 are set so that ₁ occurs.

Further, the power supply side connector 17 is sandwiched and fixed to the outer peripheral surface of the female tubular body 5 and the inner peripheral surface of the first cover body 6, and the outer peripheral surface of the male tubular body 7 and the inner peripheral surface of the second cover body 8 are also fixed. The power receiving side connector 18 is clamped and fixed to the
The electrodes (not shown) are electrically connected to each other by a power supply line 19 inserted into the cord passage 4 of the main pipe 3. Both connectors 17 and 18 have a shape that enables detachable connection.

Further, on the inner peripheral surface of the female pipe body 5, an annular step surface 21 is formed in the axial direction and along the circumferential direction facing the front end direction of the female pipe body 5.
However, in the state where the male pipe body 7 is fitted to the female pipe body 5 of the pair of extension pipes 1 and the locking projection 14 of the clamp 11 is engaged with the locking recess 16 as a contact surface of the male pipe body 7. Annular tip surface along the circumferential direction of
It is formed at a position where an axial gap C ₂ is formed between it and 22. Then, a sealing member 23 made of an annular sponge rubber or the like is fixed by an adhesive across the step surface 21 of the female tube body 5 and the inner peripheral surface on the tip side adjacent to the step surface 21. The seal member 23 is formed such that the axial thickness thereof is larger than C _{2 and} the tip end surface 22 of the male pipe body 7 airtightly abuts when the male pipe body 7 is fitted into the female pipe body 5. The surface is provided on the end face in the fitting direction which is the axial direction.

On the other hand, the hose 2 is, as shown in FIG. 4, a flexible bellows-shaped hose body 26, and an insertion pipe provided at one end of the hose body 26 and connected to a suction port of a cleaner body (not shown). And a bent cylindrical grip tube 27 provided at the other end of the hose body 26. The outer peripheral surface of the proximal end portion of the female tube body 5 is fitted to the inner peripheral surface of the distal end portion of the grip tube 27 and is fixed by an adhesive. Further, a grip pipe cover body 28 is fixed to the upper side of the outer peripheral surface of the grip pipe 27 by a screw 29,
A cover portion 30 that is continuous with the grip tube cover body 28 is formed below the outer peripheral surface of the tip of the grip tube 27.

Further, in the tube space between the grip tube cover body 28 and the outer peripheral surface of the grip tube 27, the variable resistor 31 for controlling the suction force of the electric blower of the cleaner body (not shown) and the motor of the suction port are turned on.
A switch for turning off is supported and fixed, and a slider 33 for operating the variable resistor 31 and a knob 34 for operating the switch 32 are slidably supported on the upper surface of the grip tube cover body 28, respectively. Has been done. Also a variable resistor
31 and the switch 32 are inserted into a cord passage 35 formed between the outer peripheral surface of the grip tube 27 and the grip tube cover body 28,
In addition, the signal line 36 and the power supply line 37 embedded in the hose body 26
Via the power supply circuit and the control circuit in the cleaner body.

The structure of the hose 2 near the female pipe body 5 is substantially the same as the structure of the extension pipe 1 near the female pipe body 5. That is, the male pipe body 7 of the extension pipe 1 is detachably fitted to the female pipe body 5 of the hose 2, and the clamp 11 and the switch 32 are attached near the female pipe body 5 of the hose 2. A power supply side connector 17 and a seal member 23, which are electrically connected via a power supply line 38, are provided. In addition, about these details, the same code | symbol as the corresponding part of the extension pipe 1 is attached | subjected, and the description is abbreviate | omitted.

The suction port body (not shown) has a connecting pipe connected to the female pipe body 5 side of the extension pipe 1, and the structure near this connecting pipe is almost the same as the structure near the male pipe body 7 of the extension pipe 1. It has become.
That is, the connecting pipe of the suction port body also has a male pipe body which is detachably fitted to the female pipe body 5 and has a locking recess, a power receiving side connector, and the like.

Next, the operation of the above embodiment will be described.

At the time of normal cleaning, the insertion pipe of the hose 2 is connected to the suction port of the cleaner body (not shown), the male pipe 7 side of the extension pipe 1 is connected to the grip pipe 27 of the hose 2, and the female pipe of the extension pipe 1 is connected. The male pipe body 7 side of another extension pipe 1 is connected to the pipe body 5 side, and the connecting pipe of the suction port body is further connected to the female pipe body 5 side of this extension pipe 1.
When the male pipe body 7 is fitted to the inner peripheral side of one end of the female pipe body 5, the tapered portion of the locking projection 14 is first pressed by the male pipe body 7 in the direction in which the locking projections 14 separate from each other. The clamp 11 is deformed. Further, when the through hole 15 of the female pipe body 5 overlaps with the locking recess 16 of the male pipe body 7, the locking projection 14 is engaged with the locking recess 16 by the urging of the clamp 11, and the female pipe body 5 And the male pipe body 7 is locked. As the female tube body 5 and the female tube body 7 are locked, as shown in FIG. 1, the front end surface 22 of the male tube body 7 is fitted to the sealing member 23 of the female tube body 5. The sealing surface of the end surface of the sealing member 23 is airtightly contacted from the joining direction, that is, the axial direction, and the sealing member 23 is compressed in the axial direction. At the same time, the power supply side connector 17 and the power receiving side connector 18 are connected.

Then, the feeders 19, 37, 3 relayed by the connectors 17, 18
Power is supplied from the cleaner body (not shown) to the electric motor of the suction port via 8, the rotating brush is rotated by this motor, dust is picked up from the carpet, and the electric blower inside the cleaner body is driven. The dust that has been scraped up is sucked from the suction port body and guided to the dust collecting chamber of the cleaner body through the extension pipe 1 and the hose 2.

At that time, the tip surface 22 of the male pipe 7 is attached to the sealing member 23 of the female pipe 5.
Are in airtight contact with each other from the axial direction, so that even if there is a gap C ₁ between the inner peripheral surface of the female pipe body 5 and the outer peripheral surface of the male pipe body 7, between the female pipe body 5 and the male pipe body 7. It is possible to reliably prevent air leakage from the. Therefore, generation of noise due to air leakage can be prevented, loss of suction power is eliminated, and suction performance can be improved. Further, rattling between the female pipe body 5 and the male pipe body 7 can be prevented, so that usability and commercialability can be improved. Furthermore, by preventing rattling, damage to the connectors 17 and 18 can be prevented.

Further, when the suction port body, the extension pipe 1 and the hose 3 are detached from each other, first, the push button portion 12 is pushed to engage the clamp 11 with each locking projection portion 1.
The locking projections 14, 14 are deformed in the direction in which the
And the engagement recess 16 of the male pipe body 7 is released. And
In this state, the male pipe body 7 is pulled out from the female pipe body 5.

By the way, as described above, the tip end surface 22 of the male pipe body 7 contacts the sealing member 23 of the female pipe body 5 from the fitting direction, that is, the female pipe body 5 and the male pipe body 7 are fitted to each other only when the fitting is completed. Since the male pipe body 7 abuts on the sealing surface of the end face of the seal member 23 of the pipe body 5,
Compared to the conventional structure in which a seal member provided on one of the female pipe body and the male pipe body is brought into contact with the other in the radial direction, the seal member 23 when attaching and detaching the female pipe body 5 and the male pipe body 7 is used. Since there is no frictional resistance, the load can be reduced, and the detachability can be improved.
Improves usability.

Further, since the seal member 23 is held on the step surface 21 of the female pipe body 5, the structure of the mold for molding the female pipe body 5 is simplified and the female pipe body 5 can be easily molded.

Although the electric motor is provided in the suction port body and the connectors 17 and 18 are provided in the extension pipe 1 and the like in the above embodiment, the present invention can be applied to an extension pipe without a connector.

Next, another embodiment of the present invention will be described with reference to FIG.

The embodiment shown in FIG. 5 has an annular groove portion along the circumferential direction on the inner peripheral surface of the female pipe body 5 of the embodiment shown in FIGS.
41 is provided, the seal member 23 is projected inwardly in the groove 41, and the tip surface of the male pipe body 7 is provided on the end surface of the seal member 23 in the fitting direction.
A sealing surface with which 22 abuts is provided for fitting and holding. The groove 41 is integrally formed of, for example, a shrink core.

According to this structure, the seal member 23 can be easily attached without using an adhesive.

Next, still another embodiment of the present invention will be described with reference to FIG.

In the embodiment shown in FIG. 6, the diameter is increased toward the base end of the female pipe body 5 on the inner peripheral surface of the seal member 23 projecting inwardly of the female pipe body 6 of the embodiment shown in FIG. An inclined surface 42 that is inclined in the direction and reaches the inner peripheral surface of the female tube body 5 is formed.

According to this structure, the wind does not swirl in the vicinity of the end surface of the seal member 23 where the male pipe body 7 does not contact, and the flow of the wind can be smoothed. Therefore, it is possible to prevent the generation of noise and the loss of suction power due to the generation of turbulence.

Next, still another embodiment of the present invention will be described with reference to FIG.

In the embodiment shown in FIG. 7, the inner peripheral surface of the female pipe body 5 of the embodiment shown in FIG. A pressing portion 43 for pressing the end face is formed. Further, the surface of the pressing portion 43 is an inclined surface 44 that is inclined in a direction of expanding the diameter toward the base end of the female tube body 5,
The distal end side and the proximal end side of the female pipe body 5 have substantially the same radial thickness. In the embodiment shown in FIG. 7, the groove 41 is formed by, for example, secondary processing.

According to this structure, the fifth embodiment shown in FIGS.
The holding stability of the seal member 23 can be further improved as compared with the embodiment shown in FIG. 6 and the embodiment shown in FIG. You can definitely. Further, the inner diameter of the female tube body 5 on the base end side is shown in FIG.
4 to the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6, the loss of the air passage area can be reduced.

Further, according to the structures of the embodiment shown in FIGS. 1 to 4, the embodiment shown in FIG. 5, the embodiment shown in FIG. 6 and the embodiment shown in FIG. 7, the inner peripheral surface of the female tubular body 5 is Since the seal member 23 is disposed on the above, the seal member 23 is not visible from the outside and has a good appearance.

(Effect of the Invention) According to the connection pipe of the electric vacuum cleaner of the present invention, the contact surface provided at the tip of the male tube is axially arranged on the sealing surface of the seal member provided on the inner peripheral surface of the female tube. Since the female pipe and the male pipe are fitted to each other, the airtightness of the female pipe and the male pipe can be maintained and rattling can be prevented, and the female pipe and the male pipe can be attached and detached. At this time, the female tube body and the male tube body can be easily attached and detached without causing frictional resistance between the seal member and the male tube body, and the operability can be improved.

[Brief description of drawings]

FIG. 1 is an axial sectional view in the vicinity of a fittingly connected pipe body showing an embodiment of a connecting pipe of an electric vacuum cleaner of the present invention, and FIG. 2 is a first II-II sectional view of the same as above, and FIG. Is an axial sectional view of the entire extension tube provided with the same tubular body, FIG. 4 is an axial sectional view of a part of the hose provided with the same tubular body, and FIGS. 5 to 7 are other embodiments of the present invention. It is an axial sectional view of the vicinity of the seal member of the pipe body which is fitted and connected, showing each example. 5 …… Female tube, 7 …… Male tube, 11 …… Clamp, 21 ……
Step surface, 22 ... Tip surface as contact surface, 23 ... Seal member, 41, 45 ... Groove portion.

Claims (2)

[Claims] 1. A female pipe body, a male pipe body which is removably fitted to an inner peripheral side of one end of the female pipe body along an axial direction, and the female pipe body and the male pipe body are detachably engageable with each other. A ring-shaped seal member, which is provided along the circumferential direction on the inner peripheral surface of the female tube body and has a seal surface on the end surface in the fitting direction of the female tube body and the male tube body, And a ring-shaped contact surface that is provided at the tip of the male tube body and that contacts the sealing surface of the sealing member in the axial direction. 2. The connecting pipe for an electric vacuum cleaner according to claim 1, wherein the seal member is held in a groove formed in the female pipe body.