JPS6151886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vacuum cleaner, and more particularly, to a vacuum cleaner equipped with a rotary brush suitable for cleaning carpet surfaces and the like.

(Prior technology) Recently, there has been a remarkable tendency for the range of use of carpets to expand, but conventional vacuum cleaners with suction methods cannot separate and suction dust attached to the carpet, so 2. Description of the Related Art Vacuum cleaners specifically designed for carpets or vacuum cleaners designed primarily for cleaning carpets have been developed, which are equipped with a rotating brush that separates and floats dust attached to carpets. In these vacuum cleaners, a rotary brush is rotated with strong rotational force in order to scrape and separate the dust adhering to the carpet surface. On the other hand, when pushing the handle provided at the rear of the vacuum cleaner, the front side tends to lift up, and for this reason, when the vacuum cleaner lifts off the floor, the load on the rotating brush becomes lighter and the number of revolutions decreases. As a result, there was a risk that the rotating brush would come into contact with only the tips of the tufts of the carpet and wear them out, or that they could get caught on curtains and the like, causing damage.

One possible solution to this problem is to detect when the wheels of the vacuum cleaner have left the floor and turn off the electric motor. For example, as shown in FIG.
Reference numeral 6 designates an axle shaft 18 of a wheel 19 which is rotatably and vertically movable inserted into a bearing hole 17 formed on both sides of the main body 1 in the form of an elongated vertical hole. A conductive ring 20 is fitted and fixed to the surface, and the conductive ring 20 is formed of an elastic piece and is connected to the conductive ring 20 when the axle 18 is located at the upper end side of the bearing hole 17, that is, when the wheel 19 is in contact with the ground. The first terminal 22 in contact with the axle 18
A switch 21 is formed by a second terminal 23 which is always in contact with and a second terminal 22,
23 to close the switch 21 and close the power supply circuit of the electric blower, and cause the motor of the electric blower to rotate the rotary brush mounted on the lower front side of the main body 1 via a transmission mechanism such as a belt. When the main body 1 lifts up from the floor, the axle 18 descends under its own weight, the conductive ring 20 separates from the first terminal 22, the switch 21 is opened, the electric blower is stopped, and the rotating brush is turned off. Make it stop.

(Problems to be Solved by the Invention) In a vacuum cleaner as shown in FIG. is opened and closed,
There is a problem in that the electric blower operates intermittently, which causes adverse effects such as wear and damage on the brushes of the electric blower.

The present invention has been developed in view of the above-mentioned problems, and when the main body of the vacuum cleaner rises above the surface to be cleaned, a traveling device provided to be movable in the vertical direction descends, and this traveling device activates a control element that controls the electric motor. The rotary brush is driven with low torque to prevent damage to the tufts of the carpet, to prevent the curtain from getting caught, and to avoid any negative impact on the electric motor, as well as to prevent damage to the carpet surface, etc. To provide a vacuum cleaner that does not cause any damage.

[Structure of the invention]

(Means for Solving the Problems) The vacuum cleaner of the present invention includes a vacuum cleaner body equipped with an electric motor and a rotary brush, which is driven by the electric motor and is attached to the lower part of the front side, and which separates dust attached to the surface to be cleaned. a traveling device which is provided at the front lower part of the vacuum cleaner main body in the vicinity of and in front of the rotary brush and is movable in the vertical direction and moves downward when the main body floats above the floor surface; a control element that is actuated by the movement of the traveling device and reduces the operating torque of the electric motor; the control element is actuated by the movement of the traveling device to reduce the operating torque of the electric motor; This is characterized by lowering the operating torque of.

(Function) In the vacuum cleaner of the present invention, when the main body is maintained in a normal state, the control element drives the electric motor to rotate the rotary brush with high torque. As the main body moves, the rotating brush scrapes the floor surface and lifts dust from the floor surface.

When the main body rises above the floor surface during cleaning, the traveling device descends due to its own weight and activates a control element. As a result of the operation of this control element, the electric motor is controlled to a low torque via the control circuit and rotates. The brush operates low torque.

(Embodiment) Next, the structure of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a vacuum cleaner body, and an electric blower 2 as a motor is housed and fixed in an electric blower chamber 3 formed at the rear, and this electric blower chamber 3 has an intake chamber (not shown) and an exhaust chamber separated by a partition wall 4. The exhaust side of the electric blower 2 is communicated with the exhaust chamber 5, and the exhaust chamber 5 is communicated with the outside through an exhaust port 6.

Further, an air intake port (not shown) is formed in the air intake chamber of the electric blower chamber 3 and communicates with an air intake port 7 opened at the front bottom surface of the main body 1, and is located between the air intake port 7 and the air intake port. A dust collection chamber 9 is formed in which a bag-shaped dust collection filter 8 is removably housed.

Further, a rotary brush 10 facing the suction port 7 of the main body 1 and in contact with the floor is mounted on a shaft in the left-right direction. This rotating brush 10 has brushes 12 spirally planted on the circumferential surface of a rotating member 11. Further, this rotary brush 10 is connected to a pulley 1 provided on a rotary member 11.
3 and a pulley 14 provided on the motor of the electric blower 2, the belt 15 is interlocked with the motor of the electric blower 2 and operated.

Next, reference numerals 16 and 16 denote traveling devices, which are comprised of axles 18, 18 which are pivotally supported at the front and rear of the main body 1, and wheels 19 provided at both ends of the axle 18. The front traveling device 16 is the rotary brush 1.
The axle shaft 18 of this front traveling device 16 is provided in close proximity to the front side of the main body 1, as shown in FIG. It is inserted into and supported by a shaft.

Reference numeral 46 denotes a control element, and this control element 46 is constituted by a winding 45 of the electric blower 2 that is switched in stages according to the vertical movement of the traveling device 16. Then, the control element 46 is switched stepwise, the electric blower 2 is controlled to be driven with low torque, and the rotary brush 10 is also driven with low torque.

An opening 26 is provided in the upper part of the main body 1 to allow the filter 8 to be inserted into and removed from the dust collection chamber 9.
This opening 26 is sealed with a cover plate 27.

Further, the electric motor 21 of the electric blower 2 is connected in series with a power source together with a main switch 28.

Next, the operation of this embodiment will be explained.

When the main switch 28 is closed and the main body 1 is held in the normal state, the axle 18 of the front traveling device 16 is engaged and supported at the upper end of the bearing hole, and the control element 46 is connected to the electric blower. The motor winding 45 is switched to the high torque side, and the motor of the electric blower 2 is controlled and driven at high torque, and the rotary brush 10 is also rotated via the belt 15. When the main body 1 is moved by the front and rear traveling devices 16, 16, the rotating rotary brush 10 rubs the floor surface and lifts the dust from the floor surface, and the dust is lifted up by the suction of the electric blower 2. The collected dust is sucked into the suction port 7, the dust is captured by the filter 8, and the filtered air is discharged from the exhaust port 6.

When the front side of the main body 1 rises above the floor surface when cleaning by pushing the handle 37 provided at the rear of the main body 1, the axle 18 descends through the bearing hole due to the weight of the wheels 19 and the axle 18, and the control is performed. The element 46 switches the motor winding 45 to the low torque side, the motor of the electric blower 2 is controlled to low torque, and the rotating brush 10
Also operates at low torque.

Furthermore, although the electric blower 2 as an electric motor has been described in the above embodiment, an electric motor provided separately from the electric blower 2 may be controlled.

〔Effect of the invention〕

According to the present invention, the front traveling device including wheels provided near the rotary brush is moved downward when the main body of the vacuum cleaner rises from the floor surface, and the electric motor is controlled by the control element controlled by this traveling device. By controlling the drive to a low torque, the rotary brush operates at a low torque, so when cleaning, the front of the vacuum cleaner body lifts off the floor, and the rotary brush lifts up, removing only the tips of the tufts on the carpet surface. Even if the rotating force of the rotary brush is increased, it is suitable for cleaning the same carpet surface where dust is attached to the surface to be cleaned, without the risk of damage due to rubbing and without pulling in curtains, etc. Safety is increased. In addition, the control element of the electric motor is operated by the traveling device, so the operating part of the control element does not get caught on uneven parts formed on the floor surface.
The main body can be moved smoothly and reliably without compromising running performance, and the motor does not repeatedly turn on and off every time the rotating brush lifts off the floor, so there is no negative impact on the motor. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the same as above, and Fig. 3 is a running device and electric FIG. 3 is a perspective view showing the relationship between switch parts. DESCRIPTION OF SYMBOLS 1... Vacuum cleaner main body, 2... Electric blower as an electric motor, 10... Rotating brush, 16... Traveling device, 46... Control element for switching the winding 45 of the electric motor.

Claims (1)

[Scope of Claims] 1. A vacuum cleaner body equipped with an electric motor and a rotating brush driven by the electric motor at the lower front side for separating dust attached to a surface to be cleaned; a traveling device which is located close to the brush and in front of the rotating brush and is movable in the vertical direction and moves the main body downward when it floats above the floor; and the electric motor which is activated by the movement of the traveling device. and a control element for reducing the operating torque of the rotary brush, and the operating torque of the rotary brush is reduced by moving the traveling device downward when the vacuum cleaner main body floats above the surface to be cleaned. Machine.