JPH05285081A - Tail lock connection of vacuum cleaner attachment - Google Patents

Abstract

PURPOSE:To achieve a smaller size without reducing the thickness of a connection by a method wherein the connection comprising a tail lock made up of a pawl part, a support part and a shaft part and an operating part is formed on the receiving side of an extension pipe linked and the tail lock is energized in the direction of a smaller diameter to be made free to turn. CONSTITUTION:Inserting part 13 of one cylinder 3 is inserted into an inner cylinder surface 2 of the other cylinder 3 at a joint part of an extension pipe to join the extension pipe. A tail lock 9 made up of a shaft part 7, a support part 8 and a pawl part 5 and an operating part 6 of the tail lock 9 are arranged on the receiving side 4. In the operating part 6, the tail lock 9 is energized with a tail lock spring 10 in the direction of a smaller diameter to connect the cylinders 3 together. When the operating part 6 is depressed, the tail lock spring 10 is compressed to force the pawl part 5 off the engaging part 12, taking the cylinders 3 apart. This allows the miniaturization of the connection without lowering the strength of the cylinders.

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 buckle connecting portion of attachments such as hoses, extension tubes and power nozzles of a vacuum cleaner which is detachably provided with a buckle.

[0002]

2. Description of the Related Art In recent years, with the spread of carpets in general households, a power nozzle equipped with a rotating brush driven by an electric motor has come to be used, and an extension tube has a built-in electric wire.
In addition, the mainstream is that the hose, extension pipe, and extension pipes, and extension pipe and floor nozzle are detachably configured by a buckle structure for the purpose of selectively using accessories depending on the cleaning place and improving the storability.

Conventionally, Japanese Patent Laid-Open No. 1-314537 and Japanese Utility Model Laid-Open No. 1-1314 have been used as extension pipes for this type of vacuum cleaner.
As shown in Japanese Patent Publication No. 69, the buckle coupling part is generally composed of a cylindrical body, and comprises a buckle having a claw portion arranged on the outer side of the cylindrical body and an engaging portion formed in an insertion portion that engages with the inner cylindrical surface. Was becoming.

Regarding this type of connecting portion, FIGS. 6 to 7 show an example of the attaching / detaching portion of the extension pipes. Reference numeral 1 denotes an extension tube composed of a cylindrical body 3 having an inner cylindrical surface 2, and a receiving side 4 at one end.
A buckle 9 consisting of a claw portion 5, an operating portion 6, a shaft portion 7 provided on both sides in the widthwise direction in the middle thereof, and a support portion 8 integrally forming the above portion is attached by a buckle spring 10 in the radial direction. An insertion portion 13 is provided which is arranged so as to be urged to rotate and which has an engaging portion 12 which is engaged with the inner cylindrical surface 2 and which engages with the claw portion 5 and which is provided in a concave shape on the insertion side 11 at the other end. is there. Further, 14 is a terminal pin, and 15 is a terminal plate, each of which constitutes an electrical connection portion. Reference numeral 16 denotes a lid body that covers the buckle and the electrical connection portion and is integrated on the upper side of the cylindrical body 3. The shaft portion 7 of the buckle 9 has the same cross-sectional shape, and the receiving side 4 has a bearing portion 1 that engages with this shaft portion.
7 is formed above the uppermost surface of the cylindrical body 3.

In the above structure, the extension tube 1 is mounted on the receiving side 4 by the buckle coupling for cleaning, and the buckle 9 is operated to be detached to replace or store accessories.

[0006]

In such a conventional buckle coupling structure for an electric vacuum cleaner, since the shaft portion 7 has the same sectional shape, the wall thickness t of the bearing portion 16 is the largest at the center portion. Since it becomes thinner and thicker on both the left and right sides, stress is likely to concentrate, and there is a limit to lowering the center position of the shaft portion 7, and miniaturization of the joint portion cannot be realized. Further, when the engaging portion 12 is formed in a concave shape, the engaging portion 12 is undercut with respect to the outer peripheral surface of the inserting portion 8 in order to prevent the buckle 9 from coming off even if it is pulled in the direction of separating the coupling portion. There was no choice but to make the structure complicated, and the molding die structure was complicated.

The present invention is intended to solve the above problems, and it is a first object of the present invention to reduce the center position of the shaft portion and reduce the size of the coupling portion without reducing the wall thickness at the center of the bearing portion.

A second object is to make the engaging portion into a shape which can be molded with a simple mold structure while being downsized.

[0009]

In order to achieve the above-mentioned first object, the present invention comprises a cylindrical body having an inner cylindrical surface, a claw portion at one end, an operating portion at the other end, and a width direction at the middle thereof. A buckle composed of a shaft portion provided on both outer sides and a support portion integrally formed with the above portion is rotatably arranged by urging the buckle spring in a radial direction by a buckle spring, and is attached to the inner cylindrical surface. And the insertion side having an insertion portion provided with an engaging portion that engages with the pawl portion, and the shaft portion of the buckle is formed to project toward the pawl portion side from the support portion, and is formed on the receiving side. The lower surface of is arranged below the uppermost surface of the cylindrical body.

Further, in order to achieve the second object, the center of the shaft portion is arranged on the uppermost surface of the inner cylindrical surface.

[0011]

According to the present invention, with the above-described configuration, the shaft portion provided on both outer sides in the width direction between the claw portion and the operating portion is formed so as to project toward the claw portion side from the support portion, and is formed on the receiving side. Since the lower surface of the bearing is disposed below the uppermost surface of the cylindrical body, it is possible to lower the shaft center position without reducing the wall thickness at the center of the bearing.

Further, since the center of the shaft portion is arranged on the uppermost surface of the inner cylindrical surface, even if the engaging portion is formed in a concave shape, undercut does not occur.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will now be described with reference to FIGS.
Will be described with reference to. In FIG. 5, a hose 21 and a hose tip 22 are attached to a main body 20, and an extension pipe 1 and a power nozzle 23 each have an electric connection portion built in the tip pipe 22 and are detachably attached by a buckle 9. ing. That is, as shown in FIGS.
Is composed of a cylindrical body 3 having an inner cylindrical surface 2, and has a receiving side 4 at one end, a claw portion 5 and an operating portion 6, a shaft portion 7 provided on both outer sides in the width direction in the middle thereof, and the above-mentioned portion as one body. The buckle 9 composed of the supporting portion 8 formed in the above is rotatably arranged by urging the buckle spring 10 in the radial direction by the buckle spring 10, and is fitted to the inner cylindrical surface 2 on the insertion side 11 at the other end. An insertion portion 13 is provided in which an engagement portion 12 that engages with the concave portion 5 is provided in a concave shape. Further, 14 is a terminal pin, and 15 is a terminal plate, each of which constitutes an electrical connection portion. Reference numeral 16 denotes a lid body that covers the buckle and the electrical connection portion and is integrated on the upper side of the cylindrical body 3. The shaft portion 7 of the buckle 9 is formed so as to project from the support portion 8 toward the claw portion 5, and the lower surface of the bearing portion 16 formed on the receiving side 4 is arranged below the uppermost surface of the cylindrical body 3. The wall thickness t of the bearing portion 17 is substantially the same as the wall thickness at the center of the cylindrical body, which is almost the same as the conventional one.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the figure, the center of the shaft portion 7 of the buckle 9 is aligned with the uppermost surface of the inner cylindrical surface 2, and the bearing portion 1
7 is larger than the center of the cylindrical body 3 and is provided on both the left and right sides. The concave engaging portion 12 formed in the insertion portion 13
Has a wall surface perpendicular to the outer peripheral surface of the insertion portion 13, and is not undercut.

The operation of the above configuration will be described. In the first embodiment, the shaft portion 7 is formed so as to protrude from the support portion 8 toward the claw portion 5 side, and the lower surface of the bearing portion 16 formed on the receiving side 4 is arranged below the uppermost surface of the cylindrical body 3. Cylinder body 3
The central position of the shaft portion 7 can be lowered without reducing the thickness of the central portion of the shaft, and the joint portion can be downsized.

Further, in the second embodiment, since the center of the shaft portion 7 is arranged at the same position as the uppermost surface of the inner cylindrical surface 2, the engaging portion 12 is formed.
Since it does not become an undercut even if it is formed into a concave shape,
It can be molded with a mold having a simple structure.

In the above embodiment, the joint between the extension pipes is described, but the joint between the tip pipe and the extension pipe or between the extension pipe and the power nozzle may be used.

[0018]

As is apparent from the above embodiments, according to the present invention, it is possible to reduce the size of the joint portion without lowering the strength, reduce the weight, and improve the usability.

Further, the mold structure can be simplified and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a central cross-sectional view showing a connecting portion of an extension pipe according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line aa in FIG. 1 according to the first embodiment of the present invention.

FIG. 3 is a central sectional view showing a joint portion of an extension pipe according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line bb of FIG. 1 according to the second embodiment of the present invention.

FIG. 5 is a view showing the state of use of the vacuum cleaner having the coupling portion according to the embodiment of the present invention.

FIG. 6 is a central sectional view showing a joint portion of an extension pipe in a conventional example.

FIG. 7 is a sectional view taken along line cc of FIG. 7 in a conventional example.

[Explanation of symbols]

 2 Inner cylinder surface 3 Cylindrical body 4 Receiving side 5 Claw part 6 Operating part 7 Shaft part 8 Support part 9 Buckle 10 Buckle spring 11 Inserting side 12 Engaging part 13 Inserting part

Claims (2)

[Claims] 1. A support portion formed of a cylindrical body having an inner cylindrical surface, a claw portion at one end, an operating portion at the other end, a shaft portion provided on both outer sides in the width direction in the middle thereof, and a support portion integrally forming the above portion. A buckle consisting of a buckle that is rotatably urged by a buckle spring in a small-diameter direction, and an insertion portion that engages with the inner cylinder surface and that has an engaging portion that engages with a claw portion. The electric cleaning is composed of the insertion side and the shaft part of the buckle protruding from the support part to the claw part side, and the lower surface of the bearing part formed on the receiving side is arranged below the uppermost surface of the cylindrical body. Buckle connection part of machine attachment. 2. The buckle coupling part of the vacuum cleaner attachment according to claim 1, wherein the engaging part is formed in a concave shape in the insertion part, and the center of the shaft part is arranged on the uppermost surface of the inner cylindrical surface.