JP3184857B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner having moving wheels, and more particularly, to prevention of breakage of 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 a vehicle suddenly rides on an obstacle such as a sill during use or when the main body is accidentally dropped. For example, Japanese Unexamined Patent Publication No. 4-33624 discloses a device for preventing breakage of a wheel when a large impact force is suddenly applied to the wheel. That is, the one described in this publication is formed by projecting a cylindrical bearing outward on the wheel mounting surface of the lower main body, and further forming an annular projection concentrically with this bearing so as to protrude lower 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 to protrude from the back surface of the frame toward the main body,
The axle is fitted to the bearing and the wheel is attached to the main body,
When a sudden impact force is applied to the outermost peripheral portion of the wheel during use or the like, the annular rib of the wheel is brought into contact with the annular convex portion to prevent damage to the wheel or the axle.

[0003]

In the above-mentioned conventional structure for preventing damage to wheels, even if the effect of preventing damage to external force applied from a direction parallel to the axle or from a direction inclined to the axle is obtained, the structure can be used during running. When an impact force perpendicular to the axial direction of the axle is applied to the outermost peripheral portion of the wheel, which occurs most often, the annular convex portion of the main body and the annular rib of the wheel do not interfere at all, that is, the axle is When it is displaced in the direction perpendicular to the direction, the annular rib abuts on the annular convex part, so that the deviation cannot be prevented, so that the wheel is not damaged when impact force perpendicular to the axial direction of the axle is applied There is a problem that you can not.

[0004]

SUMMARY OF THE INVENTION The first aspect of the present invention solves the above-mentioned conventional problems, and is connected to a dust collecting chamber provided with a dust collecting device and is supplied with power through a power cord. In a vacuum cleaner in which a moving wheel is attached to a main body having an electric blower chamber accommodating an electric blower, the wheel is formed integrally with a tire portion and the tire portion and has an axle in the center thereof. An annular wall extending toward the axle side parallel to the axle is formed between a frame portion, an outer peripheral surface of the axle, and an outer peripheral surface of the tire portion, and is fitted to the outer wall of the main body with the axle. An annular protruding wall which is located inside the annular wall and is opposed to the inner peripheral surface of the annular wall with a small gap between the outer peripheral surface of the tire portion and the outer peripheral surface of the tire portion;
Surface and the inner peripheral surface of the annular wall are each made of a soft synthetic resin.
Covered with a buffer made of
Through holes formed at the boundary between the
It is characterized by being integrally connected via the Claim
The second invention also solves the above-mentioned conventional problem, and the
Connect the dust collection chamber with the device and the power cord to this dust collection chamber.
Electric blower room that houses the electric blower that is powered through
Vacuum cleaner with moving wheels attached to the main body with
In addition, the wheel is integrated with the tire portion and the tire portion.
A frame part formed and having an axle in the center thereof and said car
The axle between the outer peripheral surface of the shaft and the outer peripheral surface of the tire portion;
And an annular wall extending parallel to the axle side.
A bearing fitted to the axle on an outer wall of the body;
The outer peripheral surface is located inside the annular wall and the inner peripheral surface of the annular wall.
An annular protruding wall facing the surface with a small gap
The small gap is formed smaller than the minimum diameter of the power cord.
It is characterized by:

[0005]

Since the present invention is constructed as described above, a sudden impact force is applied to the wheels in a direction perpendicular to the axial direction while the electric vacuum cleaner is running, for example, and the axle is perpendicular to the axial direction. In the case of deviation in the direction, the inner peripheral surface of the annular wall formed on the frame portion of the wheel is received by the outer peripheral surface of the annular projecting wall formed on the main body, and further deviation is prevented, thereby preventing wheel breakage. it can.

[0006]

Next, a first embodiment of the present invention will be described with reference to FIGS.

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

A turning wheel 8 is provided on the lower surface of the front part of the main body 1.
Are provided, and running wheels 9 are provided on both sides of the rear portion.

Next, the structure of the wheel 9 and the structure of attaching 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 protrudingly formed on the back side of the frame portion 10, that is, at the center of the 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 and the outer peripheral surface 11a.
The axle 12 is formed in a hollow cylindrical shape .
In addition, a locking claw 14 is formed at the distal end, and a plurality of slits 15 are formed in the tubular portion from the distal end. When the axle 12 is fitted to a bearing formed on the main body 1 described later. To be easily bent inward to facilitate insertion.
The annular rib 13 formed on the frame 10 is formed concentrically with the axle 12.

The inner peripheral surface 13a of the annular rib 13 on the axle 12 side and the outer peripheral surface 11a of the tire portion 11
Are covered with a soft member 16a and a soft member 16b as a buffer made of vinyl chloride or the like, respectively. The soft member 16b covering the outer peripheral surface 11a of the tire portion 11 and the soft member 16a covering the inner peripheral surface 13a of the annular rib 13 form a plurality of through holes 17 formed at the boundary between the frame portion 10 and the tire 11. Are integrally connected through
The inner peripheral surface 13 of the soft member 16a and the soft member 16b
a and the outer peripheral surface 11a are effectively prevented from peeling off. When the entire circumference of the annular rib 13 is covered with the soft member 16a, the peeling can be more reliably prevented.

Next, a cylindrical bearing 19 which projects outward from the side wall 18 of the main body 1 and into which the axle 12 is rotatably fitted, and an annular projecting wall 20 which is concentric with the bearing 19 are formed. Have been. The annular protruding wall 20 has an outer surface 20a formed on the inner peripheral surface of the annular wall, that is, the annular rib 13.
Inner surface 16a of soft member 16a formed on inner surface 13a
c of the main body 1 so that the side wall 18 of the main body 1
It is formed so as to protrude from. The size of the small gap G is larger than the diameter of the power cord for supplying power to the electric blower 4, that is, the diameter of the power cord when the cross section is a circular cord. 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 running.

The wheel 9 is attached to the main body 1 with its axle 12 formed at the tip of a bearing 19 formed on the side wall 18 so as to be rotatably fitted while being 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 provided so as to cover the inner peripheral surface 13a of the annular rib 13 face each other via the small gap G. If you suddenly get over the threshold etc. during cleaning or 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 11 a of the wheel 9 covered with the soft member 16 b of the tire portion 11 in a direction perpendicular to the axis of the axle 12, that is, in a direction indicated by an arrow. Although it is deflected in the direction perpendicular 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 is
Since the contact with the outer peripheral surface 20a is prevented from being further deviated, it is possible to prevent the wheel 9 and particularly the axle 12 from being damaged.

An outer peripheral surface 20a of the annular projecting wall 20 is provided.
Gap G between the inner peripheral surface 16c of the soft member 16a
Is smaller than the minimum diameter of the power cord, the power cord does not get caught between the rear surface of the wheel 9 and the side wall 18 of the main body 1 during running of the main body 1 in cleaning, and the power cord is damaged by the entanglement. it does not cause.

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 impact force is buffered by the soft member 16a,
Although the generation of the impact sound is prevented, the soft member 16a is not always necessary from the viewpoint of preventing the axle 12 from being displaced.

Next, a second embodiment of the present invention will be described with reference to FIG. Note that the internal configuration of the cleaner body 1 is the same as that of the first embodiment, and a description thereof will be omitted. Further, when the description of the main body 1 is required, the same portions will be described using the same reference numerals.

The wheel 30 in the second embodiment is shown in FIG.
As shown in FIG. 1, the frame portion 31 includes a tire portion 32 formed integrally with the frame portion 31 and an axle 33 protrudingly formed on the back side of the frame portion 31, that is, the center portion of the surface facing the main body 1. And the tire part 3
The second back surface 32a is an annular wall. That is, in the second embodiment, the function of the annular rib 13 as the annular wall in the first embodiment is provided on the back surface 32a of the tire portion 32.

As in the first embodiment, the axle 33 is formed in a hollow cylindrical shape, and has a locking claw 34 formed at the tip end thereof. Are formed with a plurality of slits 35. An annular groove 33a is provided on the outer peripheral surface of the axle 33 to reduce contact friction with the bearing during rotation.

A cylindrical bearing 19 is provided on the side wall 18 of the main body 1 so as to protrude outward, and the axle 33 is rotatably fitted therein, and an annular projecting wall 20 concentric with the bearing 19 is formed. ing. This annular projecting wall 20
The outer surface 20a is the rear surface 32a of the tire portion 32.
Are formed so as to protrude from the side wall 18 of the main body 1 so as to face each other with a small gap G therebetween. The size of the small gap G is set smaller than the minimum diameter of the power cord for supplying power to the electric blower 4 as in the first embodiment. 18 so as not to get caught.

In this embodiment constructed as described above, similarly to the first embodiment, the axle 33 is attached to the outer peripheral surface 32b of the tire portion 32 when the vehicle suddenly gets over a threshold or the like during cleaning.
When an impact force is applied from a direction perpendicular to the axis of the axle 33, the axle 33 is displaced in a direction perpendicular to the axis and abuts against the outer surface 20a of the annular projecting wall 20 on the back surface 32a of the tire portion 32,
Since further deviation is prevented, the axle 12
Such damage can be prevented.

The outer peripheral surface 20a of the annular projecting wall 20
Since the small gap G between the power cord and the rear 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 in cleaning. And the power cord is not damaged by the entanglement.

Next, a third embodiment of the present invention will be described with reference to FIG. Note that the internal configuration of the cleaner body 1 is the same as that of the first embodiment, and a description thereof will be omitted. Further, when the description of the main body 1 is required, the same portions will be described using the same reference numerals.

The wheel 40 in the third embodiment is shown in FIG.
As shown in the figure, a frame portion 41, a tire portion 42 formed integrally with the frame portion 41, an axle 43 protrudingly formed on the back side of the frame portion 41, that is, a center portion of a surface facing the main body 1, and the body Outer peripheral surface 42a of tire portion 42
And an annular rib 44 as an annular wall formed between the axle 43 and another small diameter annular rib 45 inside the annular rib 44. Also,
The axle 43 is formed in a hollow cylindrical shape as in the first embodiment, and a locking claw 46 is formed at the distal end thereof, and a plurality of slits are formed from the distal end into the cylindrical portion. 47 are formed. In addition, an annular concave 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
The side wall 18 is provided with a cylindrical bearing 19 projecting outward and into which the axle 43 is rotatably fitted, and an annular projecting wall 20 concentric with the bearing 19 is formed. The annular protruding wall 20 is formed so as to protrude from the side wall 18 of the main body 1 such that the outer surface 20a thereof faces the inner peripheral surface 44a of the annular rib 44 via a small gap G. Similarly, a small gap g is also formed on the inner peripheral surface 20b of the annular projecting 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 dimensions of the small gaps G and g are smaller than the minimum diameter of the power cord for supplying power to the electric blower 4 as in the first embodiment. The setting is made so that the power cord is not caught between the rear surface of the wheel 40 and the side wall 18 of the main body 1 during traveling.

In this embodiment constructed as described above, similarly to the first embodiment, the shaft center of the axle 43 is attached to the outer peripheral surface 42a of the tire portion 42, for example, when the vehicle suddenly gets over a threshold or the like during cleaning. When an impact force is applied from a direction perpendicular to the axis, the axle 43 is deviated in a direction perpendicular to the axis, and the inner peripheral surface 44a of the annular rib 44 is located on the lower side of the wheel 40 in FIG. 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 at the upper side, that is, abuts at two places, thereby further deviating the wheel 40. Since the wheel 43 can be reliably prevented , damage to the axle 43 of the wheel 43 and the like can be more reliably prevented.

The outer peripheral surface 20a of the annular projecting wall 20
Since the small gap G between the power supply cord and the inner peripheral surface 44a of the annular rib 44 is smaller than the minimum diameter of the power supply cord, the power supply cord is connected to the rear surface of the wheel 40 and the side wall 18 of the main body 1 during the running of the main body 1 during cleaning. And the power cord is not damaged.

Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the internal configuration of the cleaner body 1 is the same as that of the first embodiment, and a description thereof will be omitted. Further, when the description of the main body 1 is required, the same portions will be described using the same reference numerals.

The wheel 50 in the fourth embodiment is shown in FIG.
As shown in the figure, a frame portion 51, a tire portion 52 formed integrally with the frame portion 51, and a frame portion 5
An axle 53 is formed to protrude from the rear side of the body 1, that is, 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 outer peripheral wall surface of the concave groove 54, that is, the inner peripheral surface 54a is an annular wall. The axle 53 is formed in a hollow cylindrical shape as in the first embodiment.
A locking claw 55 is formed at the distal end, and a plurality of slits 56 are formed in the tubular portion from the distal end. Note that an annular concave groove 53a for reducing contact friction during rotation is provided on the outer peripheral surface of the axle 53.

As in the first embodiment, a cylindrical bearing 19 is provided on the side wall 18 of the main body 1 so as to protrude outward, and the axle 53 is rotatably fitted therein. A concentric annular projecting wall 20 is formed. The annular protruding wall 20 is formed so as to protrude 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 concave groove 54 via a small gap G. Similarly, a small gap g is formed between the inner peripheral wall surface of the concave groove 54, that is, the outer peripheral surface 45 b and the inner peripheral surface 20 b of the annular projecting wall 20. The small gaps G and g are set to the same size, and the dimensions of the small gaps G and g are smaller than the minimum diameter of the power cord for supplying power to the electric blower 4 as in the first embodiment. It is set so that the power cord is not caught between the wheel 50 and the side wall 18 of the main body 1 during running.

In this embodiment constructed as described above, similarly to the first embodiment, the axle 53 is attached to the outer peripheral surface 52a of the tire portion 52 when the vehicle suddenly crosses a sill or the like during cleaning.
When an impact force is applied from a direction perpendicular to the axis of the axle 53, the axle 53 is displaced in a direction perpendicular to the axis, and the inner peripheral surface 54a of the concave groove 54 on the lower side of the wheel 50 in FIG. 2
0, and the outer peripheral surface 54b of the concave groove 54 abuts on the inner peripheral surface 20b of the annular protruding wall 20 on the upper side, and abuts at two places as in the third embodiment. to be able to prevent more reliably the excursion, in which it is possible to more reliably prevent breakage of such axle 53 of the wheel 50.

The outer peripheral surface 20a of the annular projecting wall 20
And a small gap G between the inner peripheral surface 54a of the concave groove 54 and the outer peripheral surface of the annular projecting wall 20 is smaller than the minimum diameter of the power cord.
Fried, during traveling of the main body 1 in the cleaning, it is not caught between the side wall 18 of the rear face body 1 of the power cord wheels 50, of the power cord caused by entrainment losses
Does not cause scratches .

In each of the above embodiments, the annular wall and the annular projecting wall are formed as continuous walls. However, the walls 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 divided into a large number, the other may be formed continuously or with a smaller number of divisions.
Desirable for obtaining good rotation of the wheels.

[0034]

The present invention is configured as described above.
If a shock is suddenly applied to the wheels in a direction perpendicular to the axial direction during traveling while using the vacuum cleaner, and the axle is displaced in the direction perpendicular to the axial direction, a ring formed on the frame of the wheel The inner peripheral surface of the wall is received by the outer peripheral surface of the annular protruding wall formed on the main body, and further deviation can be prevented, whereby the effect of preventing damage to the wheel can be obtained. Further, the sudden impact force is moderated by a soft member.
Can oppose. Further, the inner peripheral surface of the annular wall and the outer peripheral surface of the annular protruding wall
Due to the small gap between the power cord and the
It does not get caught between the loop and the side wall of the main body.

[Brief description of the 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 according to the present invention.

FIG. 3 is an explanatory diagram of prevention of damage to wheels in the embodiment.

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

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body 2 Dust collection room 3a Paper bag (dust collection device) 3b Dust collection filter (dust collection device) 4 Electric blower room 5 Electric blower 9 , 30, 40, 50 wheels 10 , 31, 41, 51 Frame part 11 , 32, 43 , 52 Tire portions 11a, 32b, 52a Outer peripheral surfaces 12 , 33, 43, 53 axles 13, 44 annular ribs (annular wall) 13a, 44a Inner peripheral surfaces 16a, 16b of annular rib (annular wall) of tire portion 17 Through hole 19 Bearing 20 Annular protruding wall 20a Outer peripheral surface 42a of annular protruding wall , 42a Back surface of tire portion (annular wall) 54 Annular groove 54a Inner peripheral surface of annular groove (annular wall) G Small gap

Continuation of the front page (56) References JP-A-62-194826 (JP, A) JP-A-6-335438 (JP, A) JP-B-8-24637 (JP, B2) (58) Fields investigated (Int) .Cl. ⁷ , DB name) A47L 9/00 102

Claims (2)

(57) [Claims] 1. A moving wheel is mounted on a main body including 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 vacuum cleaner, the wheel is formed integrally with the tire portion and the tire portion, the frame portion having an axle at the center thereof, the axle between the outer peripheral surface of the axle, and the outer peripheral surface of the tire portion. parallel with consist and extending therefrom an annular wall on the axle side, the inner peripheral surface of the outer peripheral surface thereof positioned inside the bearing and the annular wall of said axle and engaging the outer wall of the body said annular wall An annular protruding wall opposed to each other via a small gap, and the outer peripheral surface of the tire portion and the annular wall are formed.
When the inner peripheral surface is covered with a buffer made of soft synthetic resin,
In both cases, these two shock absorbers are
Integrally connected via a plurality of through holes formed in the boundary
Vacuum cleaner, characterized in that was. 2. A dust collecting chamber provided with a dust collecting device and connected to the dust collecting chamber.
Houses the electric blower that is powered through the power cord
A wheel for movement is attached to the main body equipped with an electric blower room
In a vacuum cleaner, the wheels are connected to a tire section and the tire section.
A fan formed integrally with the ear portion and having an axle at the center thereof.
A frame portion, an outer peripheral surface of the axle, and an outer peripheral surface of the tire portion;
Between the axle and an annular wall extending parallel to the axle
Construct and fit with the axle on the outer wall of the body
Bearing and the outer peripheral surface located inside the annular wall
An annular projection facing the inner peripheral surface of the annular wall via a small gap
A wall is formed and the small gap is smaller than the minimum diameter of the power cord.
An electric vacuum cleaner characterized by being formed small .