JPH0817758B2 - Electric vacuum cleaner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vacuum cleaner.

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

In FIGS. 5 to 8, 101 is an electric blower 12 inside.
1. A vacuum cleaner body provided with a dust collecting part (not shown), in which a power nozzle (suction tool for floor) 102 is an extension pipe
They are communicated with each other via 103 and a hose 104. Reference numeral 105 denotes a power cord provided along the extension pipe 103, and by connecting to a conductor wire embedded in the hose 104, the cleaner body 101 and the power nozzle 102 are electrically coupled. A rotary 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 end of the extension pipe 103 and the suction chamber 106 are connected by an auxiliary hose 110. One end of this auxiliary hose 110 is supported by the rear wall of the suction chamber 106, and the other end is supported by the upper end of a support member 111 pivotally supported inside the power nozzle 102 and fitted to the tip of the extension pipe 103. There is. The tip of the extension pipe 103 is a ring portion at the upper end of the support 111.
It is detachably fitted into 111a and 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 attached by being sandwiched between an upper main body 113 and a lower main body 114 of the power nozzle 102, and moving rollers 115, 115 are provided outside the power nozzle 102 at both ends of the shaft 112. There is. A switch 116 is provided inside the power nozzle 102 in the vicinity of the lower end of the support member 111 for switching the rotation direction of the electric motor 108 that drives the rotating brush 107, and is arranged in parallel between the electric motor 108 and the commercial power source 117. And one of the two diodes 118 and 119 interposed in the opposite direction. 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 lower end front end surface of the support 31 and is configured so that the switch 116 is switched by the forward and backward movement of the lower end of the extension pipe 103. 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 contacts 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 rearward by the extension tube 103 and retracting the power nozzle 102, 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.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In order to scrape out the dust in the cloth by switching the rotating direction of the rotating brush 107 in this way, the rotating speed of the rotating brush 107 needs to be around 4500 rpm. The rotation speed of the electric motor to be driven becomes extremely high considering the transmission loss. Switching the rotation direction of the motor rotating at a very high speed from the normal cleaning operation at a short interval of about 1 second puts a heavy load on the motor, and in particular, the temperature rises and the carbon brush wears significantly. Therefore, there is a problem that the electric motor is burnt out and the life of the electric motor is shortened.

The present invention solves such a problem, and an object of the present invention is to provide an electric vacuum cleaner that prevents burnout of the electric motor, shortens the life of the electric motor, and has good operability.

Means for Solving the Problems In order to solve the above problems, the present invention provides a suction chamber formed in a front portion of a floor suction tool, which is driven to rotate by a first electric motor and an agitator contacts a cleaning surface. An agitator is provided in contact with the floor suction tool, and a drive roller, which is driven to rotate 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, and the drive roller is operated in accordance with the front-back movement of the floor suction tool. Switching means for switching the rotation direction of the second electric motor to the same direction as the moving direction of the floor suction tool,
Moreover, the rotation speed of the second electric motor is set lower than the rotation speed of the first electric motor.

Operation According to the above configuration, the agitator is rotated in a fixed direction, that is, forward, but the drive roller is switched by the switching means to the front and the rear as the floor suction tool moves back and forth. Therefore, unlike the conventional case, the rotation direction of the first electric motor for driving the agitator is not changed, and the temperature rise and the abrasion of the carbon brush can be reduced.
In addition, the operability is improved by the drive roller, and the rotation speed of the second electric motor for driving the drive roller is set lower than the rotation speed of the first electric motor for driving the agitator, so that the second electric motor is switched between forward and reverse rotation. Even if the temperature rises and the carbon brush wear is reduced,
Moreover, the second motor can be prevented from burning.

Embodiment Hereinafter, an electric vacuum cleaner according to an embodiment of the present invention will be described with reference to the drawings.

1 to 4, 1 is an electric blower 25 inside,
In a cleaner body having a dust collecting portion (not shown), a power nozzle (floor suction tool) 2 is connected to the cleaner body 1 via an extension pipe 3 and a hose 4. 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 inside the power nozzle 2, there is provided a rotating brush (agitator) 7 in which a brush (stirring body) contacts a cleaning surface, and a first electric motor provided on one rear side of the suction chamber 6. The rotation of 8 is transmitted via the belt 9. A drive roller 10 whose outer surface contacts the cleaning surface is provided at the center of the inside of the power nozzle 2 on the rear side, and the rotation of the second electric motor 11 provided on the opposite side of the first electric motor 8 causes the belt 12 to rotate. Is being transmitted via. By the way, the tip end of the extension tube 3 and the suction chamber 6 are connected by an auxiliary hose 13. One end of the auxiliary hose 13 is supported by the rear wall of the suction chamber 6, and 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. There is. The tip of the extension tube 3 is a support tool
A ring portion 14a at the upper end of 14 is removably fitted into the ring portion 14a and fitted to the other end of the auxiliary hose 13. The lower end of the support tool 14 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 attached by being sandwiched between an upper main body 16 and a lower main body 17 of the power nozzle 2. At both ends of the shaft 15, moving rollers 18, 18 are provided outside the power nozzle 2. Has been. Reference numeral 19 denotes a switch (switching means) provided inside the power nozzle 2 and in proximity to the lower end of the support 14 for switching the rotation direction of the second electric motor 11 for driving the rotary brush 7. It is for switching and connecting to either of the two diodes 21 and 22 which are interposed in parallel and in the opposite direction between the power source and the commercial power source 20. By the switching operation of the switch 19, the rotation direction of the second electric motor 11, that is, the drive roller 10 is switched. The rotation speed of the second electric motor 11 is set lower than the rotation speed of the first electric motor 8. The extension pipe 3 is attached to the lower end of the support 14 at an angle (about 45
(2) is formed with a hole 23 whose upper end is oriented in the front-back direction in the horizontal direction.
14 is pivotally supported, and is configured to generate relative movement with the shaft 15 by moving the extension pipe 3 in the front-back 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 tube 3
The switch 19 is configured to be switched by the forward and backward movement of the lower end of the switch. That is, by pushing the power nozzle 2 forward with the lower end of the extension pipe 3, the rear end of the hole 2 comes into contact with the shaft 15 and pushes the actuator 19a,
The switch 19 is switched so that the drive roller 10 rotates in the forward direction together with the electric motor 11, and the power nozzle 2 is pulled rearward by the extension tube 3 so as to be retracted, whereby the front end of the hole 23 becomes the shaft 15. Contact the actuator 19
a to operate the drive roller 10 together with the second electric motor 11.
The switch 19 is switched so as to rotate backward. At this time, the second electric motor 11 increases the amount of protrusion from the lower surface of the power nozzle 2 of the drive roller 10, and the like, so that the first electric motor 8
The number of rotations is set low, and even if the second electric motor 11 is rotated in the forward and reverse directions, the temperature rise, the abrasion of the carbon brush, etc. are reduced, and the burnout can be prevented and the life can be improved. In FIG. 1, reference numeral 24 is a bumper made of a soft material that is sandwiched between the upper main body 16 and the lower main body 17 to prevent the furniture from being scratched. Also in FIG.
26 is a power switch provided in the cleaner body 1.

In this way, even if the rotation of the second electric motor 11 is low, the drive roller 10 is in surface contact with the cleaning surface, which gives a strong moving force and improves the operating force, and when the power nozzle 2 is moved forward, it rotates. Rotation of brush 7 and drive roller 10
The second electric motor rotates the drive roller 10 in the positive direction and further improves the operating force (self-propelled force).
Since the rotation of 11 is set lower than the rotation of the first electric motor 8 that rotates the rotating brush 7, the relative speed between the rotating brush 7 and the cleaning surface is generated even when moving forward, and the dust collection efficiency is improved. Can be increased. Further, when the power nozzle 2 is moved backward, the rotary brush 7 keeps rotating in the front direction and the drive roller 10 rotates in the rear direction, so that the relative speed between the cleaning surface such as a cloth and the rotary brush 7 increases. The number of strokes of the rotary brush 7 per unit area is increased, and high dust collection efficiency is obtained.

Although the 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, the drive roller that is normally and reversely rotated by the second electric motor is provided and the first electric motor is provided.
By rotating the agitator in only one direction by the electric motor, the conventional forward / reverse rotation of the agitator is eliminated, so the temperature rise of the first electric motor and the abrasion of the carbon brush are reduced without impairing the operability. Therefore, it is possible to prevent burnout of the first electric motor and improve the life of the first electric motor. Also, by setting the second electric motor to be lower than the rotation speed of the first electric motor, it is possible to prevent the temperature of the second electric motor for driving the drive roller from rising and the abrasion of the carbon brush to be reduced, thereby preventing the second electric motor from burning. , The life can be improved. Further, when the rotation direction of the drive roller is the same as that of the agitator, operability (self-propelling property) is improved, and further, the rotation of the second electric motor for rotating the drive roller is lower than the rotation of the first electric motor for rotating the agitator. Since the setting is made, the relative speed between the agitator and the cleaning surface is generated even when the drive roller and the agitator rotate in the same direction, and the dust collection efficiency can be improved. Further, when these rotating directions are different, the number of strokes of the rotating brush on 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, 21, 22 ...
… Diodes, 23… holes.

Claims (1)

[Claims] 1. An agitator, which is rotationally driven 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 tool, and the agitator is provided in a rear portion of the floor suction tool. A drive roller that is driven to rotate by a second electric motor and has an outer surface in contact with the cleaning surface, and is operated in accordance with the front-back movement of the floor suction device, and the rotation direction of the second electric motor is the suction direction for the floor. An electric vacuum cleaner in which a switching means for switching to the same direction as the moving direction of the tool is provided, and the rotation speed of the second electric motor is set lower than the rotation speed of the first electric motor.