JPS599169B2 - vacuum cleaner mouthpiece - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a mouthpiece for an electric sweeper.

The dust suction performance of the suction body is approximately determined by the flow rate of air flowing between the suction body and the floor surface (cleaning surface).

Therefore, in order to improve the dust suction performance of the suction body, it is desirable to make the gap between the suction body and the cleaning surface as small as possible, and to design the suction body so that a high-speed airflow is generated.

However, if the gap is made smaller to generate high-speed airflow as described above, the suction force of the suction body will increase and the dust suction performance will improve, but on the other hand, the suction body will stick too much to the cleaning surface and Operability deteriorates.

There is no problem when cleaning a surface with good running properties such as a wooden floor, but when cleaning a soft surface such as a carpet, the operability becomes very poor.

In other words, when cleaning a surface such as a carpet, the suction body sinks slightly, and the gap between the suction body and the surface to be cleaned becomes even smaller, which further increases the suction force and causes the carpet, etc., to slip due to a large coefficient of friction. This is because it is difficult.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned drawbacks and aims to provide a suction body for a vacuum cleaner that is easy to operate and slides well on cleaning surfaces without deteriorating dust suction performance.

That is, in the present invention, an air introduction groove is provided at the base of the shielding plate attached to the suction body toward the suction port side, and an airtight holding part is provided in this air introduction groove to which the movable shielding plate approaches and separates, thereby introducing outside air. The invention is characterized in that the air vent is configured to communicate with the air introduction groove.

During cleaning, the movable shielding plate is bent by the cleaning surface.

The movable shielding plate is separated from the airtight holding part, and the air introduction groove is opened.

Outside air from the vent flows into the suction port via the air introduction groove.

This inflow of outside air reduces the negative pressure at the suction port.

Since the suction force of the mouthpiece is weakened, operability is improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings in which an embodiment of the present invention will be described below, reference numeral 1 denotes a mouthpiece, which is constructed by attaching a lower case body 3 to an upper case body 2 with screws 4 and 5.

A suction port 8 is formed in the lower center of the lower case body 3 and includes a central suction port 6 and a suction passage 7 communicating with the central suction port 6 and extending from side to side.

9 is a connecting pipe rotatably connected to the rear end of the mouthpiece body 1;
The suction body 1 is communicated with the main body of the vacuum cleaner through this.

A front movable shield plate 10 and a rear movable shield plate 11 are provided before and after the suction passage 7 so as to sandwich the suction passage 7 from both sides.

These movable shielding plates '+o, ii are provided in parallel along the longitudinal direction of the suction passage 7 and substantially match the length of the suction passage 7.

The movable shielding plates 10 and 11 are made of an elastic material such as rubber or soft vinyl chloride.

The movable shielding plates 10, 11 are composed of plate-shaped tongue portions 12, 13 and prismatic mounting portions 14, 15.

The front and rear movable shielding plates 10.11 are attached to the mouthpiece body 1 in the following manner.

First, the front movable shielding plate 10 will be described.

A front sled portion 16 is formed on the lower surface of the front side of the suction port 8 of the lower case body 2.

At the upper part of the front sled part 16, a mounting storage part 17 for the front movable shielding plate 10 is provided.

This mounting storage part 17 includes a push side wall 18 and a front wall part 1 of the suction port 8.
9 and a mounting protrusion 20 placed between the two.

The insertion groove 21 connected to the mounting part storage part 11 is connected to the mounting protrusion 2.
0 and the front wall portion 19.

The front shielding movable plate 10 is attached to the lower case body 3 by inserting its tongue portion 12 into the insertion groove 21 and inserting the attachment portion 14 into the attachment storage portion 17.

The tip of the tongue portion 12 protrudes more than enough from the lower surface of the front sled portion 16.

Next, the rear shield movable plate 11 will be described.

A rear curvature portion 22 is formed on the lower surface of the rear side of the suction port 8 of the lower case body 2.

An attachment storage section 23 for the rear shielding movable plate 11 and a brush storage section 24 are provided above the rear sled section 22 .

The attachment storage section 23 is composed of a back surface of a rear wall section 25 of the suction port 8, a front wall section 26 of the brush storage section 24, and a support bottom section 27.

The insertion groove 28 connected to the mounting storage part 23 is connected to the support bottom 27.
is formed on the front side.

The rear shielding movable plate 11 is attached to the lower case body 3 by inserting its tongue portion 13 into the insertion groove 28 and inserting the attachment portion 15 into the attachment storage portion 23.

The tip of the tongue portion 13 protrudes more than enough from the lower surface of the rear sled portion 22.

The brush storage section 24 is composed of a front wall section 26 and a rear wall section 29.

An entry/exit groove 30 is provided at the bottom of the brush storage section 24.

The brush 31 is inserted into the brush storage portion 24 so as to be freely removable.

This brush 31 is switched up and down using a switching lever 32.

As mentioned above, the front and rear movable shielding plates i0, 11 are attached to the lower case body 3.
After the brush 31 is attached, the mouthpiece body 1 is assembled with the upper case body 2.

Reference numeral 33 designates a damper integrally wrapped around the outer periphery of the mouthpiece body 1.

Reference numeral 34 denotes a roller provided at the lower part of the lower case body 3 of the suction body 1, and the lower ends of the tongue portions 12, 13 of the front and rear movable shielding plates 10, 11 protrude below the lower surface of the roller 34.

Reference numerals 35 and 36 denote pressing protrusions provided on the upper case body 2, and by pushing the front and rear movable shielding plates io and i1 from above, the front and rear movable shielding plates 10 and 11 are moved to the mounting storage portion 17. I'm trying not to get removed from 23.

37 is a cylindrical body, one end of which communicates with the connecting pipe 9, and the other end of which communicates with the central suction port 6.

Next, the configuration of the air introduction path will be explained.

An air introduction groove 38 extending upward is provided at the back of the rear wall 25 of the suction port 8.

A large number of air introduction grooves 38 are provided in the rear wall portion 25.

A ventilation hole 39 is provided in the upper part of the upper case body 2.
This vent port 39 is communicated with the suction port 8 via an air introduction groove 38.

The air introduction path is configured in this way.

An airtight retaining portion 40 is provided below the air introduction groove 38 .

Since the rear shielding movable plate 11 is placed in a state of being joined to this airtight holding part 40, the air introduction path is blocked here.

When the rear shielding movable plate 11 is separated from the airtight holding part 40, the air introduction path is opened.

Next, the use of the mouthpiece 1 having the above structure will be described.

First, the case of cleaning a board floor will be explained with reference to FIG.

When the mouthpiece body 1 is moved forward in the direction of arrow F, the tongue portions 12 and 13 of the front and rear movable shielding plates 10 and 11 are deflected rearward due to the frictional force with the cleaning surface.

At the same time, due to the suction force of the main body of the vacuum cleaner, the air pressure inside the suction port 8 of the suction body 1 becomes negative pressure, so a load P acts on the tongues 12 and 13 of the front and rear movable shielding plates io and i1. do.

The vectors of the load P applied to the tongue portion 12 of the front movable shielding plate 10 and the frictional force are the same, but the vectors of the load P applied to the tongue portion 13 of the rear movable shielding plate 11 and the frictional force are opposite to each other.

For this reason, the amount of deflection of the tongue portion 12 of the front movable shielding plate 10 increases, and a slight gap G is formed between the tongue portion 12 and the cleaning surface.

When moving the mouthpiece 1 backward, the direction of deflection of the tongues 10 and 11 is opposite to that when moving forward, and a gap G is formed between the tongue 13 of the rear movable shielding plate 11 and the cleaning surface.

Dust on the surface to be cleaned is efficiently sucked by the high-speed airflow flowing through this small gap G.

Since the cleaning surface of the board floor has a small coefficient of friction, the airtight maintenance part 36
The tongue portion 13 of the rear movable shielding plate 11 does not bend until the close contact with the rear shield movable plate 11 is released.

For this reason, although strong dust suction and suction forces act on the suction body 1, the operability of the suction body 1 does not deteriorate because the cleaning surface of the board floor is slippery.

On the other hand, when cleaning a carpet surface, the brush 31 is retracted by operating the switching lever 32 as shown in FIGS. 6 and 7.

The roller 34 of the suction body 1 sinks into the carpet, and the carpet is pulled up by the suction force, and the front and rear movable shielding plates 10,
The tongue portions 12, 13 and the front and rear sled portions 16, 22 of 11 are in close contact with the carpet.

Therefore, the gap G as mentioned above through which air flows is eliminated,
The mouthpiece 1 is strongly attracted to the floor surface.

However, when the mouthpiece body 1 is moved forward in the direction of arrow F, the tongue part 1 of the rear shielding movable plate 11 has a large friction coefficient of the carpet.
3 is largely deflected against the load P, and the tongue portion 13 separates from the airtight retaining portion 40 as shown in FIG.

The air introduction path, that is, the air introduction groove 38 is opened, and the air from the vent 39 passes through the internal space B of the mouthpiece body 1, passes through the air introduction groove 38, and flows to the suction port 8, as shown by the arrow.

As a result, the negative pressure on the side of the suction port 8 is reduced, and the adsorption force of the suction port 1 is relaxed.

In addition, the air from the ventilation port 39 is transferred to the rear wall portion 25 as described above.
Since the airflow passes between the lower end of the suction body 1 and the floor surface and flows to the suction port 8, this air flow also works effectively for dust suction, and the dust suction ability of the suction body 1 does not decrease significantly.

The cleaning surface of a carpet has a very large coefficient of friction, making it difficult to move the mouthpiece 1 forward, but the suction force is alleviated, making it easier to operate.

When the mouthpiece is moved backward, the tongue portion 13 of the rear shielding movable plate 11 is placed in close contact with the airtight holding portion 40, as shown in FIG.

The suction force of the suction body 1 is not relaxed, but when the suction body 1 is moved backward in the direction of the arrow F', an upward force in the direction of the arrow R acts on the suction body, canceling out the suction force.

Therefore, even if the air introduction passage does not open when going backwards, the operability will not deteriorate significantly, and the air introduction passage will not open.
All the suction power of the main body of the vacuum cleaner can be used for the dust suction action of the suction body.

Since the movable shielding plate 11 provided to increase the dust suction ability of the suction body 1 is used as a valve body for opening and closing the air introduction groove 38, there is no need to newly provide a valve body for opening and closing the air introduction groove 38. There is no increase in points.

As described above, according to the present invention, it is possible to provide a mouthpiece with good operability without significant deterioration in dust suction performance.

Furthermore, since the air introduction groove is opened and closed by a movable elastic body, no special parts are required and the structure is extremely simple.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the mouthpiece, FIG. 2 is a sectional view taken along line n-n' in FIG. The figure is a plan view of the lower case body of the suction unit, and FIG. 5 is a cross-sectional view taken along the line v-v' in FIG. 1, showing the cleaning state of the plate floor surface. FIG. 6 is a diagram showing the cleaning state of the carpet surface when moving forward, and FIG. 7 is a diagram showing the cleaning state of the carpet surface when moving backward. 1...Suction body, 8...Suction port, 11.
... Rear shielding movable plate, 38 ... Air introduction groove, 40 ... Airtight holding part, 39 ... Ventilation port.

Claims (1)

[Claims] 1. A suction body having a suction port consisting of a central suction port and a suction passage communicating with the central suction port and extending from side to side, and a movable elastic shield hanging from the front or rear side of the suction port and provided along the suction passage. An air-introducing groove is provided at the base of the movable shielding plate toward the suction port, and this air-introducing groove is provided with an airtight retaining part that the movable shielding plate approaches and separates from, thereby controlling the amount of outside air introduced. A suction body for a vacuum cleaner, characterized in that an air opening is configured to communicate with the air introduction groove.