JPH0654781A - Suction port for vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent overload on a motor by parallely arranging the top surface of a suction port and the top surface of the bearing of a rotary brush and a spring biasing the bearing downward vertically to the top surface part of the bearing and by detecting a load working on the rotary brush delicately. CONSTITUTION:A pair of ribs 29 and 29 on the side of a lower case 6 is formed integral and a bearing assembly 25 is provided in a groove 30 between the both the ribs 29 and 29 so as to allow the assembly 25 to move vertically along the groove 30. Hence, a rotary brush 2 pivotally supported on the bearing assembly 25 can move vertically and the rotary brush 2 is normally positioned at the lowest position by a its own weight and by the action of a spring 31. The spring 31 is arranged vertically to the top surface of a bearing 26 between the mutually parallel top surfaces the bearing 26 and an upper case 5. Thus, with the upward movement of the rotary brush 2 (moving askew upward), the brush separates from the surface of a carpet and is adjusted automatically so as to reduce resistance received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a rotary brush and an electric motor for rotationally driving the rotary brush through a transmission mechanism in a suction port body, and rotatably supports both ends of the rotary brush by bearings. , A groove for sliding the bearing up and down is formed in the suction port main body by inclining in the direction from the electric motor side to the rotating brush side as it goes upward, and the bearing is urged downward in the suction port main body. The present invention relates to a suction port of an electric vacuum cleaner provided with a spring.

[0002]

2. Description of the Related Art A suction port of this type is provided with a rotary brush and an electric motor for driving the rotary brush to rotate through a transmission mechanism in the suction port main body, and both ends of the rotary brush are rotatably supported by bearings. , A groove for sliding the bearing up and down in the suction port body is formed by inclining from the electric motor side to the rotating brush side as it goes upward, rotating the rotating brush, and rotating the rotating brush from the carpet. By effectively scraping out the trash, the carpet can be effectively cleaned.

By the way, there is a suction port provided with a rotating brush, which is provided with a spring for urging the bearing downward in the same direction as the vertical movement direction of the bearing, as in Japanese Utility Model Laid-Open No. 58-100257. It was

[0004]

However, the suction port of the vacuum cleaner is designed to be small and lightweight in order to improve the handling and cleaning performance. In such a suction port, the amount of movement of the bearing is reduced. However, it was not possible to obtain a delicate biasing force because the spring could not take a large amount and the dimension of the spring in the biasing direction also became small. Moreover, the actual Kaisho 58-10
If the moving direction of the bearing and the urging direction of the spring are in the same direction as in Japanese Patent No. 0757, all the urging force of the spring is applied to the bearing, and a subtle urging force cannot be obtained. , Such as the suction port that drives the rotating brush to rotate with the electric motor, the rotating brush is moved up and down subtly in response to the load applied to the rotating brush, and the load applied to the electric motor is kept constant. It could not be used as a suction port that had to prevent loading.

Further, in the case where the suction port main body is molded from resin and the rib for mounting the spring by inserting it into the central space of the spring is provided integrally with the suction port main body, this rib also corresponds to the inclination of the groove. The ribs must be formed diagonally, and the strength of the ribs must be accurately obtained so that the ribs will not be damaged, and there is a problem that the formation of the ribs is very precise and resin molding becomes difficult. It was

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, in which a rotary brush and an electric motor for rotationally driving the rotary brush via a transmission mechanism are provided in the suction port main body, Both ends of the brush are rotatably supported by bearings, and a groove for sliding the bearing vertically is formed in the suction port main body by inclining from the electric motor side to the rotating brush side as it goes upward. A spring for urging the bearing downward is provided in the mouth body, the upper surface of the suction port and the upper surface of the bearing are provided substantially in parallel, and the spring is provided perpendicularly to the upper surface of the bearing. .

[0007]

With the suction port having the above-mentioned structure, when the carpet is cleaned, if the rotary brush receives a resistance when the carpet is cleaned, the bearing moves corresponding to this resistance and the load applied to the electric motor becomes constant, and No overload. At this time, the urging force of the spring for urging the bearing is applied from an angle deviated to some extent with respect to the moving direction of the bearing, so that all the urging force of the spring is not applied to the bearing, and a force weaker than the actual force of the spring is applied. Therefore, it is possible to give a subtle biasing force to the spring.

[0008]

Embodiments of the present invention shown in the drawings will be described in detail below. Suction port body 1 has upper case 5 and lower case 6
The cover 7 constitutes an outer shell, and a rear end portion is provided with a vertically rotatable drive pipe 8, and a rotatable suction pipe 9 is connected to the tip end thereof.

The lower case 6 acts as a sled for a carpet, and has a horizontally long dust collecting opening 10 formed in the front portion of the lower surface thereof, and a rubber sealing material 1 behind the opening 10.
1 is arranged in the lateral direction. The lower case 6 is provided with rollers 12 on the front surface of the lower surface and wheels 13 on the rear surface so that a constant gap is formed between the lower surface of the lower case 6 and the floor surface by the rollers 12 and the wheels 13. Has become.

Inside the suction port body 1, the upper case 5 and the lower case 6 are connected to each other so that the rotating brush chamber 14 and the brush chamber 1
4 is formed to communicate with the drive pipe 8 side, and the rotating brush chamber 14 and the communication passage 15 form a dust suction passage from the dust suction opening 10 to the drive pipe 8.
Further, mechanism chambers 16 and 17 are formed on both sides inside the suction port body 1, and inside the motor chamber 1 on both sides of the communication path 15.
8 and an outlet storage room 19 are formed, and each room 1
6 to 19 are appropriately partitioned with respect to the dust suction passage.

The opening 20 of the upper case 5 is formed in the rotating brush chamber 1.
This is for facilitating the removal of lint and the like that face the rotating brush 2 and are entangled in the rotating brush 2, and are normally closed by a removable cover 7.

The bumper 21 is sandwiched between the cases 5 and 6 and located on the outer periphery of the suction port body 1.
6 has a sealing effect on the connecting surface and a buffering effect against obstacles.

The rotary brush 2 has a structure in which a beater 22 and brush bristles 23 are provided on the outer peripheral surface in a single or plural spiral shape. The rotary brush 2 is inside the rotary brush chamber 14 and the shafts 24 at both ends are inside the machine chambers 16 and 17. The bearing assembly 2 in the chambers 16 and 17
It is rotatably supported by 5.

The bearing assembly 25 comprises a bearing 26, a bearing holder 27 and an elastic body 28 interposed therebetween.
It is held in the machine chambers 16 and 17 so as to be vertically movable. That is, the lower case 6 forming the machine rooms 16 and 17
A pair of ribs 29, 29 facing each other on one side are integrally formed, and the bearing assembly 25 is formed in the groove 30 between the ribs 29, 29.
Is positioned so that the assembly 25 can move up and down along the groove 30. Therefore, the rotary brush 2 pivotally supported by such a bearing assembly 25 is also provided so as to be vertically movable, and the rotary brush 2 normally has its own weight and the spring 31.
Positioned at the bottom by the action of. This spring 31
Is provided perpendicularly to the upper surface of the bearing 26 between the upper surface of the bearing 26 and the upper surface of the upper case 5 formed in parallel.

Incidentally, the rotary brush chamber 14 and the machine chambers 16 and 17
An opening 32 is provided in the partition wall between which the end of the rotary brush 2 is inserted and the vertical movement of the rotary brush 2 is allowed.

The electric motor 3 is an AC magnet electric motor suitable for reducing the size and weight of the suction port. The electric motor 3 is installed in the electric motor chamber 18, and its rotary shaft 33 is projected into the mechanical chamber 16 so that the machine In the chamber 16, the transmission mechanism 4 is provided between the rotary brush 2 and one shaft 24 of the rotary brush 2.

The transmission mechanism 4 comprises a pulley 34 provided on the rotary shaft 33 of the electric motor 3, a gear pulley 35 provided on one shaft 24 of the rotary brush 2, and a timing belt 36 stretched between the pulleys 34, 35. , The rotation of the electric motor 3 is transmitted to the rotating brush 2. The rotation direction of the electric motor 3 is set counterclockwise as viewed from the pulley 34 side so that the rotating brush 2 rotates in accordance with the traveling direction when cleaning.

The electric motor 3 is installed in the machine room 17.
The bearing assembly 37 that supports the free end side of the rotating shaft 33 through the pulley 34 is provided. The electric motor 3 has ventilation holes in the front and rear parts, and has a structure in which air can flow through the ventilation holes.

The inlet main body 1 has an outlet 38 housed in an outlet storage chamber 19 and its connection surface faces the outer surface. From the outlet 38, a positive temperature coefficient thermistor 39,
Electric power is supplied to the electric motor 3 via the resistor 40. The positive temperature coefficient thermistor 39 protects the electric motor 3 when the load current exceeds a certain value, the resistance value suddenly increases due to self-heating, and the electric motor 3 is stopped. Also, the resistor 40 is AC 1
It is a resistor for voltage drop for decompressing 00V and applying it to the electric motor 3.

In the figure, 41 is a capacitor for preventing radio interference,
42 is a full-wave rectifier built in the electric motor 3. The resistor 40 is held by a passage cover 43 provided across the upper part of the communication path 15, and the cover 43 houses the resistor 40 in a space defined by the communication path 15.

In FIG. 1, arrows indicate the flow of cooling air, and this flow will be described. This flow of the cooling air is generated by the operation of the electric blower in the main body of the vacuum cleaner described later, and outside air enters the electric motor chamber 18 from the air holes (not shown) also received in the upper case 5 near the electric motor 3. Entering, passing through the inside of the electric motor 3 and the resistor 40, the connecting path 15
It flows from a through hole (not shown) in the wall to the dust collecting passage, and cools the electric motor 3 and the resistor 40. Therefore, an inexpensive cement resistor or the like can be used as the resistor 40, and of course, the problem due to heat generation does not occur.

FIG. 5 is a view showing a use state of the suction port,
44 is a cleaner body, 45 is a suction hose, 46 is an extension tube,
Reference numeral 47 is a hand switch provided on the bent pipe portion 48 of the suction hose 45, 49 is an outlet provided on the bent pipe portion 48, 50 is a power cord connecting the outlets 38 and 49, and 51 is an alternating current provided on the cleaner body 44. An outlet for taking out 100V, and a power cord 52 for connecting to the outlet 51 and supplying power to the suction port body 1 side.

In the above structure, one end of the extension pipe 46 is connected to the suction pipe 9 of the suction port body 1, and the other end of the extension pipe 46 is connected via the suction hose 45 to the cleaner body 44.
With the power cord 50 connected to the outlet 38,
At 49, another power cord 52 is connected to the outlet 51 (see FIG. 5).

When the cord pulled out from the cleaner body 44 is connected to a power outlet and the hand switch 47 is turned on the floor / tatami side, only the electric blower of the cleaner body 44 is supplied with power to collect dust. Will be done.

When the hand switch 4 is turned on to the carpet side, AC 1 is applied to the outlet 38 side together with the electric blower.
00V is applied. Then, the electric motor 3 is driven by being supplied with electric power through the resistor 40, and rotationally drives the rotary brush 2 via the transmission mechanism 4. In this state, the carpet cleaning can be effectively performed by the scraping action by the rotation of the rotary brush 2 and the suction action of the air flow flowing from the dust suction opening 10 through the rotary brush chamber 14 and the communication path 15 by the electric blower. .

Carpet cleaning is performed while moving the suction port body 1 above the carpet, and at this time, the rotating brush 2 automatically adjusts the resistance received by the vertical movement to keep the load applied to the electric motor 3 small. Become. That is, when the carpet has a long bristle or is pressed strongly against the carpet surface, the rotating brush 2 receives a very large resistance. At this time, the bearing assembly 25 supporting the rotating brush 2 is placed in the groove 30. Since it can be moved up and down, the rotating brush 2 is retracted from the carpet surface by upward movement (moving diagonally upward in this embodiment) and automatically adjusted so as to reduce the resistance received.

As a result, the load applied to the electric motor 3 is suppressed to a low level, and the increase in load current is also suppressed. Therefore, even if an AC magnet electric motor is used as the electric motor 3, the carpet cleaning can be performed without any trouble in practical use.

If a large load that cannot be absorbed due to the upward movement is applied to the rotating brush 2 and the electric motor 3 is locked, an overload current will flow. At this time, the positive temperature coefficient thermistor 39 functions as a safety device. , Protect the electric motor 3.

[0029]

The suction port of the electric vacuum cleaner of the present invention has a spring for urging the bearing downwardly formed between the upper surface of the bearing and the upper surface of the upper case so as to be perpendicular to the upper surface of the bearing. Since it is provided, all the biasing force of the spring is applied to the bearing with a weaker force than the actual force of the spring without being applied to the bearing, which makes it possible to apply a delicate biasing force to the bearing, The rotary brush can be moved up and down subtly in response to the applied load, and the load applied to the electric motor can be adjusted so as to be always constant, and while preventing the electric motor from being overloaded, It is possible to obtain a constant rotation of the rotating brush at all times and to efficiently clean the carpet surface.

Moreover, since the bearing is urged in the vertical direction by the spring, the bearing comes into contact with the inner surface of the groove, preventing rattling, and moving the cleaning surface to be used for suction. Even in the case of constant vibration such as the mouth, stable sliding without rattling can be obtained, good cleaning with a rotating brush can be performed, and unnecessary load due to rattling can be applied to the magnet motor. Disappears.

Since it is not necessary to reduce the diameter of the wire material forming the spring in order to reduce the urging force of the spring, the load applied to the rotating brush can be delicately handled without lowering the durability of the spring. You can

In the case where the suction port is formed of resin and the rib is formed integrally with the suction port body by inserting the spring into the central space of the spring, this rib is provided on the upper surface of the suction port or the bearing. By forming the rib perpendicular to the upper surface, it is possible to form the rib having a required strength with a simple structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a suction port in an embodiment of the present invention and a part of which is shown in cross section except for an upper case.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

3 is a sectional view taken along line BB ′ of FIG.

FIG. 4 is an electric circuit diagram of the suction port of the present invention.

FIG. 5 is a diagram showing a usage state of the suction port of the present invention.

[Explanation of symbols]

 1 Suction Port Main Body 2 Rotating Brush 3 Electric Motor 4 Transmission Mechanism 25 Bearing Assembly 30 Groove 31 Spring

Claims (1)

[Claims] 1. A rotary brush and an electric motor for rotationally driving the rotary brush via a transmission mechanism are provided in the suction port body, and both ends of the rotary brush are rotatably supported by bearings. A groove for sliding the bearing up and down is formed to incline in the direction from the electric motor side to the rotating brush side as it goes upward, and a spring for urging the bearing downward is provided in the suction port body. In the suction port of the electric vacuum cleaner, the upper surface of the suction port and the upper surface of the bearing are provided substantially parallel to each other, and the spring is provided perpendicularly to the upper surface of the bearing. Suction port.