JPH0824173A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To inhibit abrupt deviation so as to prevent a wheel from being broken, by opposing the inner peripheral surface of an annular wall formed in a tire part of a wheel to the outer peripheral surface of an annular projecting wall formed on the outside wall of a cleaner body with a slight gap therebetween. CONSTITUTION:A wheel assembly 9 is composed of a frame part 10, a tire part 11 integrally incorporated with the frame part 10, a wheel 12 projected from the center part of the frame part 10, and an annular rib 13 as an annular wall formed on the frame part 10. Further, the inner peripheral surface 13a of the annular rib 13 and the outer peripheral surface 11a of the tire part 11 are covered thereover with soft members 16a, 16b as dampers. a cylindrical bearing 19 projected outward and rotatably fitted therein with an axle 12, and an annular projecting wall 20 concentric with the bearing 19, are formed at a side wall 18 of the cleaner body 1. The annular projecting wall 20 is projected from the side wall of the cleaner body 1 so that the outer surface 20 thereof is opposed to the inner peripheral surface 16c of the soft member 16a formed at the inner peripheral surface 13a of the annular rib 13 with a small gap therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner having moving wheels, and more particularly to preventing damage to the wheels.

[0002]

2. Description of the Related Art Conventionally, a traveling wheel provided on a main body of an electric vacuum cleaner is used when the vehicle suddenly climbs over an obstacle such as a sill during use or when the main body is accidentally dropped. In order to prevent the wheel from being damaged when a large impact force is suddenly applied, for example, the one described in JP-A-4-33624 is known. That is, in the one described in this publication, a cylindrical bearing is formed on the wheel mounting surface of the lower main body so as to project outward, and further, an annular convex portion is concentrically formed with this bearing so as to project low outward. The wheel has a structure in which a cylindrical axle fitted to the bearing and an annular rib facing the annular convex portion are formed so as to project from the rear surface of the frame toward the main body,
Fit the wheel to the main body by fitting the axle to the bearing,
When a sudden impact force is applied to the outermost peripheral portion of the wheel during use, the annular rib of the wheel is brought into contact with the annular convex portion to prevent the wheel or the axle from being damaged.

[0003]

In the above-described conventional wheel damage prevention structure, even if the wheel has an effect of preventing damage to an external force applied from a direction parallel to the axle or a direction inclined with respect to the axle, the vehicle is traveling or the like. When an impact force orthogonal to the axial direction of the axle is applied to the outermost peripheral portion of the wheel that occurs most often on the wheel, there is no interference between the annular convex portion of the main body and the annular rib of the wheel, that is, the axle When displaced in the direction orthogonal to the direction, the annular rib comes into contact with the annular convex portion and cannot prevent the displacement, preventing wheel damage when an impact force orthogonal to the axial direction of the axle is applied. There is a problem that you cannot do it.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and provides a dust collecting chamber provided with a dust collecting device, and an electric blower which communicates with the dust collecting chamber and is supplied with power through a power cord. In an electric vacuum cleaner in which a moving wheel is attached to a main body having a housed electric blower chamber, a wheel portion is formed integrally with the tire portion and the tire portion, and a frame portion having an axle at the center portion thereof and the axle. Between an outer peripheral surface of the tire portion and an outer peripheral surface of the tire portion and an annular wall extending in the axle side in parallel with the axle, and the outer wall of the main body of the bearing and the annular wall fitted with the axle. An electric vacuum cleaner having an annular protruding wall located inside and having an outer peripheral surface facing the inner peripheral surface of the annular wall with a small gap therebetween.

[0005]

Since the present invention is configured as described above, a sudden impact force is applied to the wheel in a direction orthogonal to the axial direction of the electric vacuum cleaner while the vehicle is in use, and the axle is orthogonal to the axial direction. When it is deviated in the direction, the inner peripheral surface of the annular wall formed on the frame part of the wheel is received by the outer peripheral surface of the annular protruding wall formed on the main body, and further deviation is prevented to prevent wheel damage. it can.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 is a main body of an electric vacuum cleaner, and a dust collecting chamber 2 is provided in a front portion of the main body 1, and the dust collecting chamber 2 is provided.
Is provided with a disposable paper bag 3a as a dust collecting device and a dust collecting filter 3b equipped with a filter paper and the like, and an electric blower chamber 4 communicating with the dust collecting chamber 2 is provided at the rear of the bag. The electric blower room 4 is provided with an electric blower 5 which is supplied with power via a power cord (not shown). A suction port 6 communicating with the dust collection chamber 2 is provided at the front of the main body 1.
The suction port 6 is detachably provided with a suction hose 7 to which a suction tool such as a floor brush (not shown) is connected. Further, an exhaust port (not shown) is formed in the rear part of the main body 1, so that the dust-containing air sucked from the suction tool such as the floor brush at the time of cleaning is filtered by the paper bag 3a and the dust collecting filter 3b. Only the removed air is exhausted from the exhaust port.

A swivel wheel 8 is provided on the lower surface of the front portion of the main body 1.
Is provided, and wheels 9 for traveling are provided on both sides of the rear part.

Next, the structure of the wheel 9 and the mounting structure of the wheel 9 to the main body 1 will be described with reference to FIG.

The wheel 9 includes a frame portion 10, a tire portion 11 formed integrally with the frame portion 10, and an axle 12 projectingly formed on a rear surface side of the frame portion 10, that is, a central portion of a surface facing the main body 1. And the outer peripheral surface 12 of this axle 12.
a and an annular rib 13 as an annular wall formed between the outer peripheral surface 11a of the tire portion 11.
Further, the axle 12 is formed into a hollow cylindrical shape,
A locking claw 14 is formed on the tip portion thereof, and a plurality of slits 15 are formed on the tubular portion from the tip portion,
When this axle shaft 12 is fitted into a bearing formed in the main body 1 which will be described later, the axle shaft 12 is easily bent inward to facilitate insertion. The annular rib 13 formed on the frame portion 10 is formed concentrically with the axle 12.

An inner peripheral surface 13a of the annular rib 13 on the axle 12 side and an outer peripheral surface 11a of the tire portion 11 are provided.
Are covered with a soft member 16a and a soft member 16b, which are made of vinyl chloride or the like and serve as a buffer. Further, the soft member 16b that covers the outer peripheral surface 11a of the tire portion 11 and the soft member 16a that covers the inner peripheral surface 13a of the annular rib 13 have a plurality of through holes 17 formed at the boundary portion between the frame portion 10 and the tire 11. Are connected together via
The inner peripheral surface 13 of the soft member 16a and the soft member 16b.
It is designed to effectively prevent peeling from a and the outer peripheral surface 11a. When the entire circumference of the annular rib 13 is covered with the soft member 16a, more reliable peeling prevention can be achieved.

Next, a cylindrical bearing 19 is formed on the side wall 18 of the main body 1 so as to project outward and the axle 12 is rotatably fitted therein, and an annular projecting wall 20 concentric with the bearing 19. Has been done. The outer surface 20a of the annular protruding wall 20 faces the inner peripheral surface of the annular rib 13, that is, the inner peripheral surface 16c of the soft member 16a formed on the inner peripheral surface 13a of the annular rib 13 with a small gap G therebetween. It is formed so as to project from the side wall 18 of the main body 1. The size of the small gap G is larger than the diameter of a power cord for supplying power to the electric blower 4, that is, the diameter when the cord has a circular cross section, and the diameter when the cord has a substantially elliptical cross section. The diameter is set smaller than the short diameter, in other words, smaller than the minimum diameter of the power cord so that the power cord is not caught between the rear surface of the wheel 9 and the side wall 18 of the main body 1 during traveling.

The wheel 9 is attached to the main body 1 while being rotatably fitted while the axle 12 is formed on a bearing 19 formed on the side wall 18 at the tip thereof and is prevented from coming off by a locking claw 14. ing.

As described above, the outer peripheral surface 20a of the annular protruding wall 20 and the inner peripheral surface 16c of the soft member 16a which covers the inner peripheral surface 13a of the annular rib 13 are opposed to each other with a small gap G therebetween. Therefore, if you suddenly get over the threshold while cleaning, or if you accidentally drop the main unit 1 on the floor,
As shown in FIG. 3, a large impact force is applied to the outer peripheral surface 11a of the tire portion 11 of the wheel 9 covered with the soft member 16b from the direction orthogonal to the axis of the axle 12, that is, the arrow direction. Although deviated in the direction orthogonal to the axis, the inner peripheral surface 16c of the soft member 16a formed on the inner peripheral surface 13a of the annular rib 13 has an inner peripheral surface 16c.
Since it contacts the outer peripheral surface 20a of No. 0 and further displacement is prevented, it is possible to prevent damage to the wheel 9, especially the axle 12 thereof.

Further, the outer peripheral surface 20a of the annular protruding wall 20.
And a small gap G between the inner surface 16c of the soft member 16a
Since the power cord is smaller than the minimum diameter of the power cord, the power cord is not caught between the back surface of the wheel 9 and the side wall 18 of the main body 1 while the main body 1 is running in cleaning, and the power cord is damaged by the winding. It never happens.

In the above embodiment, since the inner peripheral surface 13a of the annular rib 13 is integrally covered with the soft member 16a, a sudden impact force is applied to the tire portion 11 so that the soft member 16a projects annularly. Even if it collides with the outer peripheral surface 20a of the wall 20, the soft member 16a buffers the impact force,
Although the shock noise is prevented from being generated, the cushioning member 16a is not always necessary from the viewpoint of preventing the displacement of the axle 12.

Next, a second embodiment of the present invention will be described with reference to FIG. The internal structure of the cleaner body 1 is the same as that of the first embodiment, and the description thereof is omitted. When the main body 1 needs to be described, the same parts will be described using the same reference numerals.

The wheel 30 in this second embodiment is shown in FIG.
As shown in FIG. 3, it comprises a frame portion 31, a tire portion 32 formed integrally with the frame portion 31, and an axle 33 projectingly formed at the central portion of the rear surface side of the frame portion 31, that is, the surface facing the main body 1. And the tire portion 3
The back surface 32a of 2 is an annular wall. In other words, in the second embodiment, the back surface 32a of the tire portion 32 has the function of the annular rib 13 as the annular wall in the first embodiment.

As in the first embodiment, the axle 33 is formed in a hollow cylindrical shape, and a locking claw 34 is formed at the tip of the axle 33 and the cylindrical portion extends from the tip. A plurality of slits 35 are formed in the. The outer peripheral surface of the axle 33 is provided with an annular groove 33a for reducing contact friction with the bearing during rotation.

The side wall 18 of the main body 1 is provided with a cylindrical bearing 19 which projects outward and into which the axle 33 is rotatably fitted, and an annular projecting wall 20 which is concentric with the bearing 19. ing. This annular protruding wall 20
The outer side surface 20a is the back surface 32a of the tire portion 32.
Is formed so as to project from the side wall 18 of the main body 1 so as to face each other with a small gap G therebetween. Then, the size of this small gap G is set smaller than the minimum diameter of the power cord for supplying electric power to the electric blower 4 as in the first embodiment, and the rear face of the wheel 30 and the side wall of the main body 1 while the power cord is running. I'm trying not to get caught in between 18.

Like the first embodiment, this embodiment constructed as described above has an axle 33 on the outer peripheral surface 32b of the tire portion 32 when a sill or the like is suddenly climbed over during cleaning.
When an impact force is applied from a direction orthogonal to the axis of the axle 33, the axle 33 is displaced in the direction orthogonal to the axis and abuts the rear surface 32a of the tire portion 32 against the outer peripheral surface 20a of the annular protruding wall 20,
Further deviation is prevented, so that the axle 12 of the wheel 33 is
It is possible to prevent damage such as.

Further, the outer peripheral surface 20a of the annular protruding wall 20.
Since the small gap G between the wheel 32 and the back surface 32a of the wheel 32 is smaller than the minimum diameter of the power cord, the power cord is caught between the wheel 30 and the side wall 18 of the main body 1 during traveling of the main body 1 during cleaning. In addition, the power cord is not damaged by the winding.

Next, a third embodiment of the present invention will be described with reference to FIG. The internal structure of the cleaner body 1 is the same as that of the first embodiment, and the description thereof is omitted. When the main body 1 needs to be described, the same parts will be described using the same reference numerals.

The wheel 40 in this third embodiment is shown in FIG.
As shown in FIG. 1, a frame portion 41, a tire portion 42 formed integrally with the frame portion 41, an axle 43 and a body formed by projecting on the back surface side of the frame portion 41, that is, the central portion of the surface facing the main body 1. Outer peripheral surface 42a of the tire portion 42
And an annular rib 44 as an annular wall formed between the wheel shaft 43 and the axle 43, and another small-diameter annular rib 45 is formed inside the annular rib 44. Also,
Similar to the first embodiment, the axle 43 is formed in a hollow cylindrical shape, and a locking claw 46 is formed at the tip thereof, and a plurality of slits are formed from the tip to the cylindrical portion. 47 is formed. An annular groove 43a is provided on the outer peripheral surface of the axle 43 to reduce contact friction with the bearing during rotation.

Next, as in the first embodiment, the main body 1 is
The side wall 18 is provided with a cylindrical bearing 19 which projects outward and into which the axle 43 is rotatably fitted, and an annular projecting wall 20 which is concentric with the bearing 19. The annular projecting wall 20 is formed so as to project from the side wall 18 of the main body 1 so that the outer surface 20a thereof faces the inner peripheral surface 44a of the annular rib 44 with a small gap G therebetween. A small gap g is also formed on the inner peripheral surface 20b of the annular protruding wall 20 and the outer peripheral surface 45a of the small-diameter annular rib 45. The small gaps G and g are set to the same size, and the size of the small gaps G and g is smaller than the minimum diameter of the power cord for feeding the electric blower 4 as in the first embodiment. The power cord is set so as not to be caught between the back surface of the wheel 40 and the side wall 18 of the main body 1 during traveling.

Like the first embodiment, this embodiment having the above-described configuration has a shaft center of the axle 43 on the outer peripheral surface 42a of the tire portion 42 when a sill or the like is suddenly overcome during cleaning. When an impact force is applied from a direction orthogonal to the wheel shaft 40, the axle 43 is displaced in the direction orthogonal to the axis, and the inner peripheral surface 44a of the annular rib 44 on the lower side of the wheel 40 in FIG. The wheel 40 abuts on the surface 20a, and the outer peripheral surface 45a of the small-diameter annular rib 45 abuts on the inner peripheral surface 20b of the annular protruding wall 20 on the upper side, that is, abuts at two points, thereby further deviating the wheel 40. In order to prevent it surely,
It is possible to more reliably prevent damage to the axles 43 and the like of the wheels 43.

Further, the outer peripheral surface 20a of the annular protruding wall 20.
Since the small gap G between the inner peripheral surface 44a of the annular rib 44 and the inner peripheral surface 44a of the annular rib 44 is smaller than the minimum diameter of the power cord, while the main body 1 is running during cleaning, the power cord is attached to the rear surface of the wheel 40 and the side wall 18 of the main body 1. It is not caught between and, and the power cord is not damaged due to the involvement.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The internal structure of the cleaner body 1 is the same as that of the first embodiment, and the description thereof is omitted. When the main body 1 needs to be described, the same parts will be described using the same reference numerals.

The wheel 50 in this fourth embodiment is shown in FIG.
As shown in FIG. 5, a frame portion 51, a tire portion 52 formed integrally with the frame portion 51, and the frame portion 5
1, an axle 53 is formed so as to project from the back side, that is, in the center of the surface facing the body 1, and an annular groove 54 is formed between the body tire portion 52 and the axle 53. The wall surface on the outer peripheral side of the groove 54, that is, the inner peripheral surface 54a is an annular wall. Further, the axle 53 is formed into a hollow cylindrical shape as in the first embodiment,
A locking claw 55 is formed at the tip portion thereof, and a plurality of slits 56 are formed from the tip portion to the tubular portion. An annular groove 53a for reducing contact friction during rotation is provided on the outer peripheral surface of the axle 53.

Further, similarly to the first embodiment, the side wall 18 of the main body 1 is provided with a cylindrical bearing 19 which projects outward and into which the axle 53 is rotatably fitted. A concentric annular protruding wall 20 is formed. The annular projecting wall 20 is formed so as to project from the side wall 18 of the main body 1 so that the outer surface 20a thereof faces the inner peripheral surface 54a of the groove 54 with a small gap G therebetween. Similarly, a small gap g is also formed between the inner peripheral wall surface of the groove 54, that is, the outer peripheral surface 45b and the inner peripheral surface 20b of the annular protruding wall 20. The small gaps G and g are set to the same size, and the size of the small gaps G and g is smaller than the minimum diameter of the power cord for feeding the electric blower 4 as in the first embodiment. The power cord is set so as not to be caught between the wheel 50 and the side wall 18 of the main body 1 during traveling.

Like the first embodiment, this embodiment having the above-described configuration has an axle 53 on the outer peripheral surface 52a of the tire portion 52 when, for example, suddenly crossing a sill or the like during cleaning.
When an impact force is applied from a direction orthogonal to the shaft center of the wheel, the axle 53 is displaced in the direction orthogonal to the shaft center, and the inner peripheral surface 54a of the groove 54 is located at the lower side of the wheel 50 in FIG. Two
0, the outer peripheral surface 54b of the concave groove 54 abuts on the inner peripheral surface 20b of the annular projecting wall 20 on the upper side, and abuts on the inner peripheral surface 20b of the annular projecting wall 20 at two locations as in the third embodiment. In order to reliably prevent further excursions of
It is possible to more reliably prevent damage to the axles 53 and the like of the wheels 50.

Further, the outer peripheral surface 20a of the annular protruding wall 20.
And the small gap G between the inner peripheral surface 54a of the groove 54 and the outer peripheral surface of the annular protruding wall 20 is smaller than the minimum diameter of the power cord, the power cord is rotated by the wheel 50 while the main body 1 is running during cleaning. It is not caught between the back surface of the main body 1 and the side wall 18 of the main body 1, and the power cord is not damaged due to the winding.

In each of the above embodiments, the annular wall and the annular protruding wall are continuous walls. However, this need not necessarily be continuous and may be formed by dividing into a large number. However, when one of the annular wall and the annular protruding wall is formed by dividing it into a large number, the other may be formed continuously or formed with a small number of divisions.
Desirable for good wheel rotation.

[0034]

Since the present invention is constructed as described above,
If a wheel is subjected to a sudden impact force in the direction orthogonal to the axial direction while the vacuum cleaner is running and the axle is displaced in the direction orthogonal to the axial direction, the ring formed on the frame of the wheel By receiving the inner peripheral surface of the wall by the outer peripheral surface of the annular protruding wall formed in the main body and preventing further deviation, it is possible to prevent the wheel from being damaged.

[Brief description of drawings]

FIG. 1 is a diagram showing an entire vacuum cleaner of the present invention.

FIG. 2 is a partial cross-sectional view of the first embodiment showing the configuration of the wheel and the main body in the present invention.

FIG. 3 is an explanatory view of preventing damage to the wheels of the above embodiment.

FIG. 4 is a partial cross-sectional view of a second embodiment showing the configuration of the wheel and the main body in the present invention.

FIG. 5 is a partial cross-sectional view of a third embodiment showing the configuration of the wheel and the main body in the present invention.

FIG. 6 is a partial cross-sectional view of a fourth embodiment showing the configuration of the wheel and the main body in the present invention.

[Explanation of symbols]

 1 Main Body 9 Wheel 10 Frame Part 11 Wheel 12 Axle 15 Ring Rib (Ring Wall) 16 Soft Member 19 Bearing 20 Ring Projecting Wall

Claims (3)

[Claims] 1. A moving wheel is attached to a main body provided with a dust collecting chamber provided with a dust collecting device and an electric blower chamber containing an electric blower communicating with the dust collecting chamber and supplied with power through a power cord. In the electric vacuum cleaner, the wheel portion is formed between the tire portion and the frame portion having the axle portion integrally formed with the tire portion, and the outer peripheral surface of the axle portion and the outer peripheral surface of the tire portion. A bearing that is formed of an annular wall that extends in parallel to the axle side and that fits with the axle on the outer wall of the main body, and the outer peripheral surface of which is located inside the annular wall is the inner peripheral surface of the annular wall. An electric vacuum cleaner characterized in that annular protruding walls are formed so as to face each other with a small gap therebetween. 2. The outer peripheral surface of the tire portion and the inner peripheral surface of the annular wall are respectively covered with cushioning bodies made of soft synthetic resin, and a plurality of these cushioning bodies are formed at a boundary portion between the tire portion and the frame portion. The electric cleaning device according to claim 1, wherein the electric cleaning device is integrally connected through the through hole. 3. The electric cleaning according to claim 1, wherein a gap formed between an inner peripheral surface of the annular wall and an outer peripheral surface of the annular protruding wall is formed smaller than a minimum diameter of the power cord. Machine.