JP3528325B2 - Electric vacuum cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a built-in dust collecting chamber and an electric blower unit, and supports three points by a pair of rear wheels arranged rearward on both sides and one universal wheel provided on the front bottom surface. The present invention relates to an electric vacuum cleaner including a vacuum cleaner main body having wheels and a suction hose assembly connected to the dust collecting chamber, and particularly to an electric vacuum cleaner having a good center-of-gravity balance and good straightness and swivelability. It concerns vacuum cleaners.

[0002]

2. Description of the Related Art A conventional electric vacuum cleaner has a cleaner body having a dust collecting chamber and an electric blower unit and having moving wheels, a suction hose portion connected to the dust collecting chamber, an extension pipe portion, and a suction portion. A suction hose assembly consisting of the above, the user grips the extension pipe to operate the suction port, and pulls the extension pipe or the suction hose to cause the cleaner body to follow (run straight and swivel) for use. To do. Such a vacuum cleaner body,
It is provided with a three-point-supporting moving wheel composed of a pair of rear wheels arranged on both sides of the rear part and one free wheel arranged on the bottom surface of the front part. In recent years, it has been proposed that these cleaner bodies are provided with rear wheels having a large diameter in order to improve the following movement by pulling the suction hose. For example,
In JP-B-5-285072, the center of gravity of the cleaner body is provided inside the outer periphery of the rear wheel, and a part of the rear wheel is provided on the rear end of the cleaner body and outside the bottom surface.
The distance between the center of gravity and the axle is shortened so that the vacuum cleaner main body can be stood up with a small lifting force without damaging the floor surface.In addition, the distance from the rear wheel to the front wheel and the distance from the rear wheel to the center of gravity are increased. It is disclosed that the vacuum cleaner body can be swung with a small force and a small turning radius by being approximately twice as large as that of the vacuum cleaner, and that the vacuum cleaner does not tip over when swung.

[0003]

In this type of electric vacuum cleaner, the user pulls the extension tube or the suction hose to indirectly move the cleaner main body, so that the electric vacuum cleaner has good followability in the pulling direction. Is required. This follow-up running has two problems: straight running performance when it is pulled straight in the front direction of the cleaner body, and turning travelability when it is pulled from the lateral direction of the cleaner body. Generally, there is a contradictory relationship between the straight traveling performance and the turning traveling performance. When the straight traveling performance is improved, the turning performance is deteriorated, and when the turning performance is improved, the straight traveling performance is deteriorated. In other words, in this type of electric vacuum cleaner, improving the straight traveling performance and the turning traveling performance in a well-balanced manner improves the follow-up traveling performance.

According to the above-mentioned conventional example, it is disclosed that the turning traveling property is improved by making the distance from the rear wheel to the front wheel almost twice the distance from the rear wheel to the center of gravity. It does not disclose straight running performance. In particular, in the above-mentioned conventional example, the turning performance is improved by specifying the dimensional relationship of the cleaner main body in the front-rear direction, but no mention is made of the lateral direction of the cleaner main body that stabilizes the cleaner main body.

The present invention has been made to solve the above problems, and an object thereof is to provide an electric vacuum cleaner having a good balance of the center of gravity and a good straightness and turning ability.

[0006]

In order to achieve the above object, the present invention comprises a cleaner body having a dust collecting chamber and an electric blower unit, and a suction hose assembly connected to the dust collecting chamber. In this electric vacuum cleaner, the cleaner main body is supported at three points by a pair of rear wheels arranged on the rear side on both sides and one free wheel provided on the front bottom surface, and the center of gravity of the cleaner main body is defined as the rear wheel shaft. Provided between the free wheels, the rear wheel diameter D and the distance PL between the rear wheel shaft and the free wheel shaft are set to 170 mm.
≦ D ≦ 190 mm, 115 mm ≦ PL ≦ 135 mm, and when the distance PL between the rear wheel shaft and the free wheel shaft is 100, the installation width W of the rear wheel, the rear wheel shaft and the cleaner body The ratio between the position of the center of gravity and the distance LG is set within the range of 205 ≦ W ≦ 225 and 15 ≦ LG ≦ 25.

[0007]

According to the invention, the center of gravity of the cleaner body is provided in the region of an isosceles triangle formed by a pair of rear wheels and one free wheel provided on the front bottom surface to stably support the cleaner body. At the same time, by providing the center of gravity on the rear wheel shaft side, the load applied to the free wheel is reduced, and the straightness is determined by specifying the diameter of the rear wheel and the size of the isosceles triangle suitable for the diameter of the rear wheel. And follow-up running with a good balance of running performance can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vacuum cleaner according to the present invention will be described in detail below with reference to FIGS. The same parts, arrows, and the like are designated by the same reference numerals, and duplicate description will be omitted.

1 to 9 show an electric vacuum cleaner according to an embodiment of the present invention, FIG. 1 is an external view showing the entire electric vacuum cleaner, and FIG. 2 is a schematic internal structure. Sectional view of the cleaner body, FIG. 3 is a right side view of the cleaner body with the handle raised, FIG. 4 is a right side view of the cleaner body with the lid cover open, and FIG. 5 is a plan view of the cleaner body. FIG. 6, FIG. 6 is a front view of the cleaner body, FIG. 7 is a rear view of the cleaner body, and FIG.
Is a mounting view of a rear wheel, and FIG. 9 is a bottom view.

First, referring to FIGS. 1 and 2, a schematic structure of an electric vacuum cleaner according to this embodiment will be described. In the figure, reference numeral 100 indicates a vacuum cleaner as a whole, which is connected to the vacuum cleaner body 1 having a dust collecting chamber 2, an electric blower unit 4, a cord reel unit 6 and the like, and the dust collecting chamber 2. The suction hose assembly 201 includes a suction hose portion 201, an extension tube portion 202, and a suction portion 203.

As for the appearance of the cleaner main body 1, a lower cover 8 of a synthetic resin molded product that covers a lower part and an upper cover 10 that covers an upper part thereof.
It has a rounded form of a front recess composed of a lid cover 12, a grill cover 14, and the like, and has a pair of large-diameter rear wheels 15a (15b) on the left and right sides of the lower rear portion, and a center of the bottom surface of the lower front portion. One small diameter free wheel 16 is arranged.

An upper cover 10 arranged at the rear of the cleaner body 1 and a lid cover 12 arranged at the front of the cleaner body 1.
Is divided into front and rear in the vicinity of the center of gravity G of the cleaner body 1,
A handle portion 18 is provided on the dividing portion 17. The handle portion 18 has an inverted U-shape supported at two positions on both sides, and is pivotably supported so as to be housed in a concave handle housing portion 20 formed in the upper cover 10.

The lid cover 12 is a clamp 1 provided at the front.
By removing 9, the hinge portion 2 provided on the side of the dividing portion 17
1 (shown in FIG. 4), the disposable paper filter 23 mounted in the dust collection chamber 2 can be replaced. Further, the lid cover 12 is provided with a mounting port 24 for the suction hose portion 201 having a shutter-type opening / closing lid 22.

At the center of the front portion of the upper cover 18, the lid cover 1
The main body switch unit 26 is provided so as to project to the second side, and the main body switch unit 26 has an infrared receiving unit 28 in the center.
And a power supply switch 30 and a cord reel button 32 on both sides. Reference numeral 34 is a driving status display unit formed of a plurality of LEDs provided on the upper cover 10 formed between the handle storage unit 20 and the main body switch unit 26.

The grill cover 14 is removably disposed at a position covering the upper rear surface of the cleaner body 1, an exhaust ventilation portion 36 is formed on the rear surface, and an exhaust filter 40 is provided inside.
Is installed. Reference numeral 38 denotes a bumper portion which is formed so as to project to both front sides of the cleaner body 1 (a joint portion between the lid cover 12 and the lower cover 8) and is integrally molded with the lower cover 8.

On the upper portion of the extension pipe portion 202, the handle portion 2 for operating the suction port portion 203 via the extension pipe portion 202.
04, and a hand operation unit 205 for instructing the operation of the cleaner body via an infrared signal. The hand operation unit 20
5 is provided with an infrared signal transmission unit 206,
The infrared signal transmitted from the transmitter 206 is transmitted to the infrared receiver 28 of the cleaner body 1. For this reason, unlike the conventional example, it is not necessary to transmit the operation signal of the hand-held operation unit through the suction hose portion. Therefore, in the present embodiment, the suction hose portion 201 is flexible and lightweight in which no signal cord is wired. It is a hose, and the mounting port 24 is formed small because it is not necessary to provide a socket for the operation signal line.

According to the present embodiment, the suction hose portion 201 (socket 207) of the suction hose assembly 200 is rotatably attached to the attachment opening 24 of the cleaner body 1 so that the user can handle the handle portion 204. It is possible to use by moving the suction port portion 203 by gripping and pulling the suction hose portion 201 to cause the cleaner body 1 to follow (run straight and turn). Further, the vacuum cleaner body 1 is operated by the hand operation unit 205, and the dust sucked from the suction port 203 is collected in the dust collection chamber 2 of the vacuum cleaner body 1 via the suction hose assembly 200, and the remaining air Is exhausted from the exhaust ventilation part 36 of the filter cover 14.

Hereinafter, the cleaner body of the vacuum cleaner according to the embodiment will be described in detail with reference to FIGS.

First, the internal structure of the cleaner body 1 will be described with reference to FIG. Vacuum cleaner body 1 according to the present embodiment
Is provided with a dust collection chamber 2 in front of the inside, an electric blower unit 4 and a cord reel unit 6 are provided side by side in the rear of the inside, and a control circuit unit 5 is provided above the electric blower unit 4 and the cord reel unit 6. ing. Further, behind the electric blower unit 4, there is formed a first exhaust ventilation passage 42a which is provided from the lower end to the upper end of the rear surface of the cleaner body 1 and which is long in the vertical direction.
The lower end of the exhaust ventilation passage 42a is further communicated with the second exhaust ventilation passage 42b formed in the lower portion of the electric blower unit 4 through a large rounded shape. The first exhaust ventilation passage 42a and the second exhaust ventilation passage 42b constitute the exhaust ventilation passage 42,
The second exhaust ventilation passage 42b is communicated with the electric blower unit 4,
The upper end of the first exhaust ventilation passage 42a communicates with the exhaust ventilation portion 36.

At the upper part of the dust collecting chamber 2, a paper filter mounting portion 4 is provided.
4a and 44b are provided, and the paper filter mounting portion 44a,
By attaching the thick paper of the paper filter 23 to 44b and closing the lid cover 12 which constitutes the upper part of the dust collection chamber 2,
4 and the paper filter 23 are set at predetermined positions. At this time, since the paper filter 23 is obliquely attached, the flow of the air flow is not greatly refracted, and the lid cover 12 can be formed along the arrangement of the paper filter 23. Can be compactly assembled. Moreover, since the mounting port 24 provided in the lid cover 12 can be inclined, the suction hose assembly 200 improves the routing of the cleaner body 1. Further, the universal wheel 16 is horizontally rotatably attached to a recess 25 formed on the front bottom surface of the lower cover 8 via a universal wheel support 27. Here, the rotary shaft 16a of the universal wheel 16 and the rotary shaft 27a of the universal wheel support 27 are provided so as to be offset in the left-right direction in the drawing, and the rotary shaft 27a of the universal wheel support 27 is rotated first during turning. By vacuum cleaner body 1
The moving wheels 16 can be directed in the moving direction of.

The dust sucked together with the airflow from the mounting port 24 is collected by the paper filter 23. Then, the air flow from which dust has been removed by the paper filter 23 passes through the communication port 50 provided with the auxiliary filter 48 provided in the partition plate 46 between the dust collection chamber 2 and the electric blower unit 4, and the electric blower unit 4 To cool the electric blower unit 4, and the cooled airflow is further provided with an exhaust filter 40 including an exhaust filter 40 from the electric blower unit 4 via the second exhaust ventilation passage 42b and the first exhaust ventilation passage 42a. Exhausted from 36.

As described above, according to this embodiment, since the first exhaust ventilation passage 42a is provided along the back surface, the length thereof can be extended, and further, the first exhaust ventilation passage 42a can be extended.
The lower end of the second exhaust ventilation passage 42 to the lower part of the electric blower unit 4.
By communicating with b, the entire exhaust ventilation passage 42 composed of the first exhaust ventilation passage 42a and the second exhaust ventilation passage 42b can be lengthened, and in addition, the second exhaust ventilation passage 42b is connected to the electric blower unit. 4 and the upper end of the first exhaust ventilation passage 42a communicates with the exhaust ventilation portion 36, so that noise generated from the electric blower portion 4 can be prevented from leaking from the exhaust ventilation portion 36, so that the noise can be reduced. Has the effect of. In addition, the first exhaust air passage 42a and the second exhaust air passage 42b
Is formed into an L-shape along the outer shape of the cleaner body 1, which has an effect of preventing the apparatus from becoming large. At this time, since the first exhaust ventilation passage 42a and the second exhaust ventilation passage 42b are connected in a large rounded shape, there is an effect of reducing the air flow resistance to make noise, and at the same time, the bottom rear end portion Since the outer shape of the is rounded, it is effective in reducing damage to the floor surface, sill, etc. due to tail hitting during traveling turning and lifting the front portion.

Next, referring to FIGS. 3 to 8, the cleaner body 1
The appearance will be described in detail. In FIG. 3, the cleaner body 1
Is a convex, continuous egg-shaped large arc surface 52a in which the front part of the upper surface of the cleaner body 1 is largely squeezed forward, with the vicinity of the upper part of the rotation axis P of the large-diameter rear wheel 15a as the top part.
And the rear portion of the upper surface of the cleaner body 1 is formed by the arc surface 52a.
The circular arc surface 52b continuous with the shape is slightly narrowed down. The rear wheel 15a is attached so that a part of the outer periphery thereof projects from the rear end portion and the bottom surface portion of the cleaner body 1. Further, the rear wheel 15a is provided above the rear wheel 15a.
Is provided to cover the cover. Rear wheel 15
A wide bumper portion 38 having a wide skirt is provided from the lower front portion to the front portion of the rotation axis P of a and 15b, and the lower cover 8 is provided at the lower portion of the bumper portion 38 after waiting one step further. There is. Further, the grill cover 14 forming the back surface of the cleaner body 1 has a thick shape when viewed from the side surface, and the entire back surface is formed of an inclined surface so that the upper part projects rearward. Therefore, in a state where the cleaner body 1 is erected so that the back surface of the cleaner body 1 is located below, the cleaner body 1 is placed on the floor indicated by the dotted line at the upper ends of the rear wheels 15a and 15b and the grill cover 14. Since it is stably supported, like the conventional example, the cleaner main body 1 can be made compact in the vertical position without deteriorating the design by providing the leg portion of the same size as the protruding portion of the rear wheels 15a and 15b on the upper rear surface. There is an effect that can be stored. It should be noted that a small protrusion may be provided at the contact portion between the grill cover 14 and the floor surface in order to prevent a scratch or the like caused by the contact. Also, the grill cover 1
The upper front part of 4 constitutes the rear end part of the concave handle housing part 20. Therefore, when the handle portion 18 is raised, the center of the upper portion of the grill cover 14 projects, and the projecting portion can be pinched by hand, so that the work for attaching and detaching the grill cover 14 can be favorably performed. On the other hand, since the handle portion 18 has a shape conforming to the rounded shape of the upper surface of the cleaner body 1, the handle portion 18 is housed in the handle housing portion 20 so that the grill cover 14
Since the handle portion 18 forms a continuous rounded shape, the entire upper surface of the cleaner main body 1 can be formed as a uniformly continuous curved surface to improve the design effect. Here, 56 is a lock lever for attaching and detaching the pair of grill covers 14 provided on both sides of the upper surface of the grill cover 14. Further, since the operation switch section 26 is provided so as to project to the lid cover 12 side, as shown in FIG. 4, when the lid cover 12 is opened by the hinge section 21, the operation switch section 26 is hidden by the lid cover 12. Therefore, there is an effect of preventing a malfunction when the lid cover 12 is opened.

In this embodiment, for example, the height H of the cleaner body 1 is 240 mm, the total length L is 340 mm, the rear wheel 15a has a diameter D of 180 mm, and the universal wheel shaft 16a.
The distance PL of the rear wheel shaft P is set to 105 mm, and the thickness KD of the grill cover 14 is set to 30 mm.

In FIGS. 5 and 6, the cleaner main body 1 has a maximum lateral width LW in the vicinity of both sides of the rotation axis P of the rear wheels 15a and 15b having large diameters, and the front portions of both sides of the cleaner main body 1 are narrowed down to the front. It is formed by a large convex arc-shaped arc surface 52a that is continuous, and the rear portions on both sides of the cleaner body 1 are slightly narrowed by arc surfaces 52b that are continuous with the arc surface 52a. A main body switch unit 26 and an operation status display unit 34 are centrally arranged near the top of the cleaner body 1. In the main body switch section 26, a power switch 30 and a cord reel button 32 are arranged in a horizontal row with the infrared light receiving section 28 at the center. The main body switch portions 26 are arranged centrally in the center of the division portion 17 on the upper surface. Moreover, since the rear portion is linear and the front portion is arranged so as to project in an arc shape on the lid cover 12 side, the user can recognize the location of the main body switch portion 26 and the operability can be improved by the centralized operation portion. There is. In addition, since the infrared light receiving portion 28 arranged at the top can be formed large, the receiving range and the receiving sensitivity can be improved, and the power switch 30 and the cord reel button 32 can be arranged with a slight inclination, so that the operability can be improved. . Further, inverted U-shaped handle portions 18 are pivotally supported at both ends of the main body switch portion 26. The grip portion 18a of the handle portion 18 is set so as to have a lateral width hw that allows the user to sufficiently grip it and a height hh to the grip portion 18a. The main body switch unit 26 arranged at the length hw has a size of a button having a character display area with a function display that is large enough to improve operability and large enough to be recognized. While being obtained, the rotating shaft 18b of the handle portion 18,
There is an effect that the dead space between 18c can be effectively used. Further, since the operation status display section 34 is arranged at the top between the handle storage section 20 and the main body switch section 26,
The visibility can be improved, and the character display area 58 provided with a function display having a size sufficient for recognizing the LEDs close to the respective LEDs of the operation status display unit 34 can be secured. Further, since the character display area 58 and the main body switch section 26 are arranged in the vicinity of the top of the cleaner main body 1, it is possible to secure a space for disposing the control circuit section 5 provided inside, which reduces an increase in size of the apparatus. There is.
Further, the main body switch section 26 and the operation status display section 34 are centrally provided on the control circuit section 5, so that the wiring can be shortened. The grill cover 14 is provided so as to cover the entire upper rear surface of the cleaner body 1. The vacuum cleaner body 1 of this embodiment has a maximum width LW of 260 m, for example.
m, the width hw of the handle 18a of the handle 18 is 120 m
m, the height hh to the grip 18a is set to 75 mm.

In FIG. 7, the grill cover 14 is provided in the upper part of the rear part about 1/3, the exhaust ventilation part 36 consisting of a plurality of lateral holes is provided on the right side of the rear part, and the power cord is on the left side of the rear part. A take-out section 58 is provided. Further, the back surface of the lower part of the grill cover 14 has a flat surface and is simply formed. Next, the large-diameter rear wheels 15a and 15b are attached to the cleaner body 1 in a manner inclined with respect to the vertical direction so as to form an inverted C-shaped chamber in which the facing interval is downward and the width is narrow. This structure will be described with reference to FIG. Figure 8
In the figure, a is a lateral cross-sectional view of a main part of the rear wheel, and FIG. In the figure, the rear wheel 15
The rotating shafts P1 of a and 15b have a cylindrical shape, and a notch 59 and a protrusion 60 for preventing the wheel from coming off are formed at the ends thereof. The rear wheels 15a and 15b are assembled by press-fitting from the outside of the main body into a cylindrical bearing 64 formed on the side wall surface 62 of the cleaner body 1. And the rear wheels 15a,
When viewed from the front or the rear, 15b is provided so as to be inclined at an angle Θ with respect to a vertical line such that the facing interval is downward and the width is narrow. When the angle Θ is set small, the turning force is small, and when it is large, the turning force is large.
Regarding straightness, the smaller the angle Θ, the easier the wheel will rotate, and the larger the angle, the harder the wheel will rotate. From the experimental results, it is appropriate to select the angle Θ within the range of 3 ° to 8 ° in consideration of the turning property and the influence on the rotation of the wheels, but in this embodiment, the angle Θ is set to 4 °. is doing.

As described above, according to the internal layout, the cleaner body 1 according to this embodiment has a top portion H and a maximum width in the vicinity of the upper portion of the rotation shaft P of the rear wheel 15a having a large diameter and on the left and right sides. The LW has a rounded and compact form in which the front, rear, and both sides are narrowed down by a large egg-shaped curved surface, and the main body switch unit 26 and the operation status display unit 34 are provided near the top of the top face most watched by the user. Is provided centrally, and the handle portion 18 is provided so as to surround the main body switch portion 26 and the driving status display portion 34, thereby providing the user with the convenient cleaner body 1.

Next, referring to FIG. 9, the balance of the center of gravity of the cleaner body 1 according to the present invention and the follow-up running will be described in detail. In FIG. 9, as described above, the cleaner body 1 according to the present invention is supported by the pair of rear wheels 15a and 15b and the single free wheel 16 provided on the front bottom surface. That is, two isosceles sides formed by the two contact points Q2, Q3 between the rear wheels 15a, 15b below the rear wheel axis and the floor surface, and the contact point Q1 between the free wheel 16 below the universal wheel axis and the floor surface. It is supported by three points on the triangle. In this embodiment, the rear wheels 15
The installation width W of the two contacts Q2 and Q3 of a and 15b is 220
mm, the distance PL between the rear wheel shaft P and the wheel shaft 16a of the free wheel 16 is set to 105 mm. This dimension value is
When the distance PL is 100, an isosceles triangle having a ratio of 210 having an installation width W about twice as large is formed. Further, in this embodiment, the center of gravity G of the cleaner body 1 is set within the region of the isosceles triangle, and the distance LG between the rear wheel axis P and the position of the center of gravity G is set to 20 mm. This dimensional value is set to have a ratio of 19 which is about 1/5 when the distance PL is 100. Here, in the present embodiment, the heaviest electric blower unit 4 and the slightly lighter cord reel unit 6 are provided side by side behind the cleaner body, so the center of gravity position G is GW from the center of the rear wheels 15a, 15b. However, the electric blower unit 4 is provided on one side only.
Thus, the cleaner body 1 is stably supported by the isosceles triangle that doubles the lateral direction (W) with respect to the longitudinal direction (PL), and the center of gravity G is provided on the rear wheel axis P side. Therefore, the load of the cleaner body 1 on the moving wheels 16 can be reduced, the rear wheels 15a and 15b can be the main wheels that support the weight of the cleaner body 1, and the universal wheels 16 can be wheels that rotate. it can. In addition, in the present embodiment, since the rear wheels 15a and 15b are large wheels having a diameter D of 180 mm, the weight of the cleaner body 1 can be firmly supported by a large arc, and therefore even on a soft floor such as a tatami mat or a carpet. Stable straight running can be obtained.

Table 1 shows that the total length L is 310 mm and the rear wheel 1 is
The installation width W of 5a and 15b is 270 mm and the height H is 230.
The rear wheels 15a, 15b in the cleaner body 1 of mm.
Distance D between the rear wheel axle P and the center of gravity G
3A and 3B show measured value data of straight traveling performance and turning traveling performance of the A to J type cleaner main body 1 having various dimension systems of the distance PL between the rear wheel shaft P and the wheel shaft 16a.

[0030]

[Table 1]

Then, actual measurements were performed with the A to J types having the following conditions. The diameter D is 150 mm and 1800
mm and 220 mm, two types of distance LG are 20 mm and 0 mm (the center of gravity position G is located on the rear wheel axis P), and a distance PL is 125 mm and 105 m.
There are two types of m. In the table, the straight-ahead value indicates the reaching distance of the cleaner body 1 when traveling on an inclined surface having a constant length and an inclination angle, and in this actual measurement,
The measurement is performed on an inclined surface formed by setting one end of a 900 mm flat plate to a height of 165 mm. Therefore, the larger the straight traveling value, the better the straight traveling performance. In the table, the numbers circled in the column of the straight-ahead value indicate the actually ranked good ranks of the AF types. The turning value indicates the height at which the cleaner body 1 starts to rotate when the cleaner body 1 is placed laterally on one end of a flat plate having a certain length and the height of the one end is raised. ing. Therefore, the smaller the turning value, the better the turning performance. In the table, the circled numbers in the column of the turning value indicate the good ranking of the actually measured A to F types. Also, the value in () is the distance P
The ratio when L is 100 is shown.

First, as is clear from the actual measurement value data of the G, H, and J types, since the straight traveling value does not change in any of the three types, even if the diameter D of the rear wheels 15a and 15b is increased. It can be seen that it does not necessarily improve straight running performance. As for the turning value, the type in which the value of the diameter D of the rear wheels 15a and 15b is 180 mm is the best among the three types, so that it can be seen that there is no correlation between the diameter D and the turning traveling property. . From the above, it can be seen that the type in which the value of the diameter D is around 180 mm is excellent in the turning traveling property. Regarding the A to F types in which the distance LG between the rear wheel shaft P and the center of gravity G is constant, the C type has both the straight running value and the turning value in a high rank, and therefore the straight running property and the turning running property are both high. It can be seen that the balance is good.

The above experimental results are obtained by roughly setting the respective dimensional values, and the height of the center of gravity G, the size of the cleaner body 1, the specific performance of the free wheel 16, the nature of the floor surface, etc. The measurement results are slightly different. Therefore, from experimental verification such as related measurement, the diameter D of the rear wheel and the distance PL between the rear wheel shaft and the free wheel shaft are 170 mm ≦ D ≦ 190 mm, 1
Setting the range of 15 mm ≦ PL ≦ 135 mm and setting the distance PL between the rear wheel shaft and the free wheel shaft as 100, the installation width W of the rear wheel and the distance between the rear wheel shaft and the position of the center of gravity of the cleaner body. The ratio with LG is 205 ≦ W ≦ 2
25, 15 ≦ LG ≦ 25, the center of gravity position G of the cleaner body 1 is set to a range of the pair of rear wheels 15
a, 15b and one free wheel 16 provided on the front bottom surface to provide a stable support of the cleaner body 1 in the region of an isosceles triangle, and the center of gravity G is provided on the rear wheel axis P side. This reduces the load on the universal wheel 16 and reduces the diameter D of the rear wheels 15a, 15b and the rear wheels 15a, 15b.
By specifying the size of the above-mentioned isosceles triangle suitable for the diameter D of 15b, there is an effect that good follow-up running can be obtained with a good balance between straight running performance and turning travel performance.

In the present embodiment, when viewed from the front or the rear of the cleaner body 1, the rotation axis P of the rear wheels 15a and 15b.
The center line of is inclined downward with respect to the horizontal surface toward the outside of the cleaner body at an angle of 3 ° or more and 8 ° or less, so that the turning traveling property can be further improved. There is. Further, in response to the demand for a long cord in recent years, even if the cord reel 6 is enlarged, the cord reel 6 is maintained without breaking the dimensional system in which the good follow-up running can be obtained or without increasing the size of the device. Can be made larger. Further, in this embodiment, since the isosceles triangle has a wide width ratio in the left-right direction with respect to the front-rear direction, the electric blower unit 4 and the large-sized cord reel unit 6 are arranged side by side behind the cleaner body 1. It has the effect of facilitating. Moreover, since the second exhaust passage 42b is provided on the bottom surface of the cleaner body 1 and the rear wheels 15a, 15b are provided obliquely, it is easy to introduce the large-sized cord reel portion 6 or the large-sized electric blower portion 4. .

Further, in the vacuum cleaner 1 according to the present embodiment,
Since the center of gravity position G is provided on the rear wheel shaft P side, the front portion of the electric vacuum cleaner 1 is easily lifted, so that the electric vehicle is swayed to the left and right at the beginning of the movement, but stable follow-up running is obtained thereafter. When the vehicle is running, the front portion of the electric vacuum cleaner 1 is easily lifted up even if there are obstacles such as a sill or a cord, so that the user can easily get over the vehicle. In this respect, the left-right blurring in the follow-up running (straight running), which is a problem of G to J type in which the center of gravity position G shown in Table 1 is on the rear wheel axis P, is greatly improved. Further, compared to the type in which the center-of-gravity position G with less blurring on the left and right is arranged in front, there is an effect of improving straight running performance and turning performance.

Furthermore, in the cleaner body 1 according to the present embodiment, the dust suction portion 24 is provided on the upper front surface of the cleaner body 1, and the suction hose 201 is rotatably provided in the dust suction portion 24, so that suction is performed. There is an effect that the hose 201 can be easily routed and good follow-up running can be obtained. In particular, it has a remarkable effect in overcoming obstacles during follow-up running.

[0037]

According to the invention, it is possible to stably follow the main body of the vacuum cleaner and to follow the following traveling in which obstacles and the like can be easily overcome and which has a good balance between straight running performance and traveling performance.

[0038]

[Brief description of drawings]

FIG. 1 is an external view showing the entire electric vacuum cleaner of an embodiment of the electric vacuum cleaner according to the present invention.

FIG. 2 is a sectional view of a cleaner body showing a schematic internal structure of an embodiment of the electric vacuum cleaner according to the present invention.

FIG. 3 is a right side view of the cleaner body with the handle of the vacuum cleaner according to the embodiment of the present invention raised.

FIG. 4 is a right side view of the main body of the vacuum cleaner according to the embodiment of the present invention with the dust collecting lid opened.

FIG. 5 is a plan view of a cleaner body of an embodiment of the electric vacuum cleaner according to the present invention.

FIG. 6 is a front view of a cleaner body of an embodiment of the electric vacuum cleaner according to the present invention.

FIG. 7 is a rear view of the cleaner body of the embodiment of the electric vacuum cleaner according to the present invention.

FIG. 8 is a mounting view of rear wheels of an embodiment of the electric vacuum cleaner according to the present invention.

FIG. 9 is a bottom view of an embodiment of the electric vacuum cleaner according to the present invention.

[Explanation of symbols]

1 ... Vacuum cleaner main body, 2 ... Dust collection chamber, 4 ... Electric blower part, 15
a, 15b ... a pair of rear wheels, 16 ... free wheel, 16a
... Free wheel shaft, 100 ... Vacuum cleaner, 200 ... Suction hose assembly, G ... Center of gravity position, D ... Rear wheel 15a, 1
Diameter of 5b, P ... Rear wheel shaft, PL ... Distance between rear wheel shaft P and universal wheel shaft 16a, W ... Installation width of rear wheels 15a and 15b, LG ... Distance between rear wheel shaft P and center of gravity position G, Θ
… Inclination angle of rear wheel

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigehiko Suzuki 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Electric Appliances Division (72) Wataru Yamamoto 1-chome, Higashitaga-cho, Hitachi-shi, Ibaraki No. 1 Electric Appliances Division, Hitachi, Ltd. (56) Reference JP-A-5-285072 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47L 9/00

Claims (3)

(57) [Claims] 1. A vacuum cleaner main body having a dust collecting chamber and an electric blower unit, and a suction hose assembly connected to the dust collecting chamber. An electric vacuum cleaner in which one end of a suction hose constituting the suction hose assembly is rotatably attached, wherein the cleaner main body is provided with a pair of rear wheels arranged rearward on both sides and a single one provided on a front bottom surface. Three points are supported by a free wheel, the center of gravity of the cleaner body is provided between the rear wheel shaft and the free wheel, and the diameter D of the rear wheel and the distance PL between the rear wheel shaft and the free wheel shaft are defined by: 170 mm ≤ D ≤ 190 m
m, 115 mm ≤ PL ≤ 135 mm, and when the distance PL between the rear wheel shaft and the free wheel shaft is 100, the installation width W of the rear wheel, the rear wheel shaft and the cleaner are set. The ratio of the distance from the center of gravity of the main body to the distance LG is set within the range of 205 ≦ W ≦ 225 and 15 ≦ LG ≦ 25, and the dust suction part is provided on the front upper part of the cleaner main body.
And a suction hose is rotatably provided at the dust suction portion . 2. When viewed from the front or the rear of the cleaner body, the center line of the rotation shaft of the rear wheel is inclined downward with respect to the horizontal plane toward the outside of the cleaner body. The vacuum cleaner according to claim 1, wherein: 3. The center line of the rotating shaft of the rear wheel is 3 degrees or more toward the outside of the cleaner body with respect to the horizontal plane,
The vacuum cleaner according to claim 2, wherein the vacuum cleaner is inclined downward at an angle of 8 degrees or less.