JPH0790010B2 - Vacuum cleaner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to vacuum cleaners.

2. Description of the Related Art A conventional vacuum cleaner of this type will be described with reference to the drawings.

5 to 8, 101 is an electric blower 121,
In the cleaner body provided with a dust collecting part (not shown), the power nozzle (suction tool for floor) 102 is extended to the cleaner body 101.
3, communicated via a hose 104. Reference numeral 105 denotes a power cord provided along the extension pipe 103, and the hose 1
The main body of the cleaner 10
1 and the power nozzle 102 are electrically coupled. A rotating brush 107 is provided inside the suction chamber 106 on the front side inside the power nozzle 102, and rotation of an electric motor 108 provided behind the suction chamber 106 is transmitted via a belt 109. . By the way, the tip of the extension pipe 103 and the suction chamber 1
An auxiliary hose 110 communicates with 06. One end of this auxiliary hose 110 is supported by the rear wall of the suction chamber 106, and the other end is supported inside the power nozzle 102.
It is supported by the upper end of 11 and fitted to the tip of the extension tube 103. The tip of the extension pipe 103 is a ring portion 111a at the upper end of the support 111.
It is removably fitted into and is fitted with the other end of the auxiliary hose 110. The lower end of the support tool 111 is pivotally supported by a horizontal shaft 112 provided at the rear end of the power nozzle 102 so as to face in the left-right direction. The shaft 112 is the upper body 11 of the power nozzle 102.
It is sandwiched between 3 and the lower body 114 and attached,
On both ends of the shaft 112, moving rollers 115, 115 are provided outside the power nozzle 102. 116 is the rotating brush
A switch provided inside the power nozzle 102 in the vicinity of the lower end of the support 111 for switching the rotation direction of the electric motor 108 for driving the 107. The electric motor 108 and the commercial power source 117 are arranged in parallel and opposite to each other. Two diodes inserted in the
It is configured to switch to either 118 or 119. A hole 120 is formed at the lower end of the support 111 so that the upper end thereof is oriented in the front-back direction in the horizontal direction when the extension pipe 103 is at an angle (about 45 °) in a normal use state. The support 111 is pivotally supported by being fitted to each other, and the extension pipe 103 is configured to move relative to the shaft 112 by moving the extension pipe 103 in the front-rear direction. The actuator 116a of the switch 116 is in contact with the front end surface of the lower end of the support 31, and is configured so that the switch 116 is switched when the lower end of the extension tube 103 is moved back and forth. More specifically, by pushing the power nozzle 102 forward at the lower end of the extension tube 103, the rear end of the hole 120 abuts the shaft 112 and pushes the actuator 116a so that the rotating brush 107 rotates forward together with the electric motor 108. By switching the switch 116 and pulling the power nozzle 102 backward by the extension tube 103 to retract it, the front end of the hole 120 is moved to the shaft 112.
The actuator 116a is operated by contacting the
At the same time, the switch 116 is switched so that the rotary brush 107 rotates backward. Reference numeral 122 is a power switch provided inside the cleaner body 101.

The problem to be solved by the invention is to change the rotating direction of the rotating brush as described above.
In order to scrape out the dust in the carpet, it is necessary to set the rotation speed of the rotating brush to around 4500 rpm, and the rotation speed of the electric motor that drives this rotating brush becomes extremely high considering transmission loss. Also, from the viewpoint of having self-propelling property, the load that the rotating brush receives from the cleaning surface is naturally large. In this way, the electric motor that rotates the rotating brush forward / reversely bears a heavy load and is constantly used under severe conditions.Therefore, the temperature rise becomes extremely high, the carbon brush wears significantly, and the life of the carbon brush shortens. There is a problem that it leads to a decrease in the life of the electric motor. In addition, it is considered that the electric motor switches at a stroke of about 1 second during normal cleaning, but depending on the conditions, the electric motor may switch at a higher speed than that. In that case, the electric motor will be in a state close to a lock and will burn out. There was a possibility of.

Furthermore, operability is improved by rotating the rotating brush forward and backward, but the relative speed of the rotating brush and the carpet is small, and the number of times the carpet is raked up per unit area of the rotating brush is reduced, resulting in poor dust collection efficiency. There was also the problem that

The present invention solves the above problems, and an object of the present invention is to provide an electric vacuum cleaner which can prevent the life of the electric motor from being shortened and burn out, and which has good operability.

Means for Solving the Problems In order to solve the above-mentioned problems, an electric vacuum cleaner of the present invention has a suction chamber formed in the front part of a floor suction tool, which is driven to rotate in one direction by a first electric motor and agitated. An agitator whose body abuts the cleaning surface is provided, and a drive roller which is rotationally driven in the opposite direction to the agitator by a second electric motor and has an outer surface abutting the cleaning surface is provided in the rear portion of the floor suction tool, An on / off switch means for the second electric motor, which is operated in accordance with the front-back movement of the floor suction tool, is provided, and by this switch means, a rotation direction of the cleaning surface side of the agitator and a movement direction of the floor suction tool are provided. The second electric motor is stopped when the directions are the same, and the second electric motor is driven when the rotation direction of the cleaning surface side of the agitator and the movement direction of the floor suction tool are opposite directions. It was done.

Action In the above configuration, since the first electric motor that drives the agitator and the second electric motor that drives the drive roller rotate only in a predetermined direction, the load on each electric motor is reduced, the temperature rise is reduced, and the carbon brush is not worn. Therefore, it is possible to prevent the burnout of each electric motor and to improve the life of each electric motor. Also, when only the rotating brush is rotating, its self-propelling property reduces the operating force,
When the drive roller is rotating together with the agitator in the opposite direction, this drive roller reduces the operating force, and the agitator and the drive roller rotate in opposite directions, so the stroke of the agitator per unit area of the cleaning surface The number of times can be increased, and the dust collection efficiency can be improved.

Example Hereinafter, one example of the present invention will be described with reference to the drawings.

1 to 4, reference numeral 1 denotes a cleaner body having an electric blower 22 and a dust collecting portion (not shown) provided therein, and a power nozzle (suction tool for floor) 2 is extended to the cleaner body 1. The pipe 3 and the hose 4 communicate with each other. Reference numeral 5 denotes a power cord provided along the extension pipe 3, and by connecting the power cord to a conductor embedded in the hose 4, the cleaner body 1 and the power nozzle 2 are electrically coupled. Inside the suction chamber 6 on the front side of the inside of the power nozzle 2, there is provided a rotating brush agitator 7 in which a brush (stirring body) abuts on the cleaning surface, and a first electric motor 8 provided on one rear side of the suction chamber 6 is provided. The rotation is transmitted via the belt 9. Also,
A drive roller 10 whose outer surface abuts on a cleaning surface is provided in the center of the inside of the power nozzle 2 on the rear side, and rotation of a second electric motor 11 provided on the opposite side of the first electric motor 8 passes through a belt 12. Are transmitted. The rotary brush 7 is rotated by the first electric motor 8 in one direction, that is, the forward direction, whereas the drive roller 10 is rotated by the second electric motor 11, in the opposite direction, that is, in the rear direction. By the way, the tip of the extension pipe 3 and the suction chamber 6 are connected by an auxiliary hose 13. One end of this auxiliary hose 13 is supported on the rear wall of the suction chamber 6,
The other end is supported by the upper end of a support tool 14 pivotally supported inside the power nozzle 2 and fitted to the tip of the extension tube 3. The tip of the extension tube 3 is detachably fitted into the ring portion 14a at the upper end of the support tool 14 and is fitted with the other end of the auxiliary hose 13. Supports 14
The lower end of the power nozzle 2 is pivotally supported by a horizontal shaft 15 provided at the rear end of the power nozzle 2 so as to face in the left-right direction. The shaft
15 is sandwiched between an upper main body 16 and a lower main body 17 of the power nozzle 2 and mounted at both ends of the shaft 15 on the outside of the power nozzle 2 for moving rollers 18, 18. Reference numeral 19 denotes a power nozzle 2 for turning on / off the power supply to the second electric motor 11 that rotationally drives the drive roller 10.
Is a switch (switch means) provided inside and in proximity to the lower end of the support tool 14. A hole 20 is formed at the lower end of the support 14 so that the upper end thereof is oriented in the front-back direction in the horizontal direction when the extension pipe 3 is at an angle (about 45 °) in a normal use state. Is supported to pivotally support the support tool 14, and the extension tube 3 is configured to move relative to the shaft 15 by moving the extension tube 3 in the front-rear direction. The actuator 19a of the switch 19 is in contact with the lower end front end surface of the support tool 14, and the extension pipe 3
The switch 19 is turned on / off by moving the lower end of the switch 19 back and forth. That is, when the power nozzle 2 is pushed forward at the lower end of the extension tube 3, the rear end of the hole 20 comes into contact with the shaft 15 and pushes the actuator 19a, so that the switch 19 is turned off, and the first drive roller 10 is driven. 2 Stop the electric motor 11. In addition, when the power nozzle 2 is pulled rearward by the extension pipe 3 and retracted,
The front end of 20 comes into contact with the shaft 15 to operate the actuator 19a, so that the switch 19 is turned on and the second electric motor 11
At the same time, the drive roller 10 rotates. In FIG. 1, reference numeral 21 is a bumper made of a soft material that is sandwiched between the upper body 16 and the lower body 17 to prevent the furniture from being damaged. Further, in FIG. 4, reference numeral 23 is a power switch provided inside the cleaner body 1.

Next, the operation of the above configuration will be described.

First, the first electric motor 8 that drives the rotating brush 7 is always rotating in the push direction of the power nozzle 2, that is, forward, and the rotation of this rotating brush 7 causes the power nozzle 2 to obtain a propulsive force in the forward direction. At this time, the second electric motor 11 that drives the drive roller 10 does not rotate because the switch 19 is off.

Next, when the power nozzle 2 is moved backward, the lower end of the extension tube 3 operates the actuator 19a of the switch 19, so that the switch 19 is turned on, and thus the second electric motor 11 is operated.
This causes the drive roller 10 to rotate backward. When the drive roller 10 rotates rearward, a rearward propulsive force is applied to the power nozzle 2. On the other hand, the rotating brush 7 is rotating forward, the relative speed to the cleaning surface such as a carpet becomes large, the number of strokes of the rotating brush 7 per unit area increases, and high dust collection efficiency is obtained.

Although a rotating brush is used as the agitator in the above-described embodiment, for example, a rotor around which a rubber lip is wound may be used.

As described above, according to the configuration of the present invention, since the first electric motor for driving the agitator is driven only in one direction, the temperature rise is low and therefore the burnout can be prevented, and the wear of the carbon brush is reduced, and the carbon brush is reduced. It is possible to improve the life of the brush, that is, the life of the first electric motor. In particular,
The second motor for driving the drive roller is in intermittent operation,
The effect becomes remarkable. Further, when the floor suction device is moved in the direction opposite to the agitator, the drive roller operates, so that the operability is not impaired. further,
Since the rotation directions of the agitator and the drive roller are opposite to each other, the number of strokes per unit area of the cleaning surface is increased and the dust collection efficiency is improved.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
The figure is a cross-sectional view of the power nozzle, FIG. 2 is a plan view with the upper main body of the power nozzle removed, FIG. 3 is an external perspective view of the vacuum cleaner, FIG. 4 is an electric circuit diagram, and FIGS. FIG. 8 shows a conventional example, FIG. 5 is an external perspective view of an electric vacuum cleaner, FIG. 6 is a vertical cross-sectional view of a power nozzle, and FIG. 7 is a plan view with an upper main body of the power nozzle removed. FIG. 8 is an electric circuit diagram. 2 ... Power nozzle, 6 ... Suction chamber, 7 ... Rotating brush, 8 ... First electric motor, 10 ... Drive roller, 11 ...
Second electric motor, 14 ... Supporting device, 19 ... Switch.

Claims (1)

[Claims] 1. An agitator, which is rotationally driven in one direction by a first electric motor and has an agitator abutting against a cleaning surface, is provided in a suction chamber formed in a front portion of the floor suction device. A second electric motor is provided in the rear part, which is driven by a second electric motor to rotate in a direction opposite to that of the agitator and has an outer surface abutting the cleaning surface, and is operated in accordance with the front-back movement of the floor suction tool. On / off switch means is provided, and when the rotation direction of the cleaning surface side of the agitator and the moving direction of the floor suction tool are the same direction by this switch means, the second electric motor is stopped and the agitator An electric vacuum cleaner configured to drive a second electric motor when the rotation direction on the cleaning surface side and the moving direction of the floor suction tool are opposite directions.