JPH0228859Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention provides a rotating brush at the suction port of the vacuum cleaner body, and when the rotating brush becomes locked due to wrapping of a carpet, etc. The present invention relates to a vacuum cleaner that cuts off power to a drive motor.

(B) Prior Art In the conventional technology described in Japanese Patent Application Laid-Open No. 1987-192321, which precedes the present invention, a belt is stretched around a pulley of a rotating brush and a fan motor as its drive source, and the rotating brush is When the belt is locked, the tension of the belt causes the shaft of the fan motor to incline together with its elastic support, and the belt moves in the direction of coming out of the fan motor shaft, pushing the belt detector. However, in this type of conventional technology, if the elastic support material is too hard, the motor shaft will not tilt and the belt detection body will not be pushed; on the other hand, if the elastic support material is too soft, the motor shaft will wobble together with the fan motor. However, there is a drawback that the belt detector may be activated due to malfunction.

(c) Problems to be solved by the invention The present invention solves the above-mentioned drawbacks, reliably detects the locked state of the rotating brush without being affected by tilting of the motor shaft of the fan motor, and also detects the locked state in the locked state. This locks the detection switch.

(d) Means for Solving the Problems The vacuum cleaner of the present invention has a configuration including a motor, a suction port, a rotating brush provided facing the suction port, a rotating shaft of the motor, and a rotating brush provided facing the suction port. A pulley part provided on each of the brushes, a belt stretched between the two pulley parts and transmitting the power of the motor to the rotating brush, and at least one of the two pulley parts, the diameter of which gradually becomes smaller in the axial direction. a detection switch that detects deviation of the belt toward the small diameter portion and cuts off power to the fan motor; and a locking means that locks the detection switch in the detected state. It is characterized by the following:

(e) Effect According to the present invention, when the rotating brush is locked, a slip occurs between the belt and the rotating brush pulley, the tension of the belt increases, and the belt slips along the tapered surface of the pulley to the small diameter section. The detection switch is actuated by deflecting to the side, and the actuated detection switch is locked in that state.

(F) Example Next, an example of the present invention will be described. 1st
In the figure, 1 is an upright type vacuum cleaner body, 2
3 is a handle body, and 3 is a dust collection part. Handle body 2
is rotatably connected to the rear part of the vacuum cleaner main body 1, and the dust collecting part 3 is bag-shaped and its lower end communicates with the inside of the vacuum cleaner main body 1.

In Figures 2 and 3, 4 is a suction port provided at the front of the lower surface of the vacuum cleaner main body 1, and 5 is a rotating brush provided in the suction port 4, which removes dirt that adheres to the carpet, etc. It removes garbage. 6 is holder 6a
A fan motor is supported by a fan (not shown), and the fan (not shown) is positioned within a ventilation passage (not shown). The other end of this air passage opens at the rear of the cleaner main body 1, and the dust collecting section 3 is connected to that part. A belt 7 transmits driving force to the rotating brush 5, and is stretched between the rotating shaft 6b of the fan motor 6 and pulley portions 8 and 9 provided at one end of the rotating brush 5, respectively. 10 is the vacuum cleaner body 1
wheels (only one shown) located on both sides of the rear of the vehicle.

In the vacuum cleaner having the above configuration, the fan motor 6
When the rotary brush 5 operates, the rotary brush 5 also moves in conjunction with the rotary brush 5, and the rotary brush 5 scrapes up the dust on the carpet floor and collects it in the dust collecting section 3 through the ventilation path.

The pulley portion 8 of the fan motor 6 is the fourth
As shown in the figure, it is tapered to a smaller diameter in the axial direction. This tapered pulley portion 8
Then, when the rotating brush 5 is locked, a slip occurs between the pulley portion 8 and the belt 7, and the tension of the belt 7 is further strengthened, and as a result, the pulley portion 8
Along the tapered surface of the belt 7, the belt 7 is deviated toward the small diameter portion 8a as shown by the chain line. As a configuration for deflecting the belt 7, instead of the pulley portion 8, the pulley portion 9 on the rotating brush 5 side may be formed into a tapered shape.
Alternatively, both pulley portions 8 and 9 may be tapered with a looser taper degree. The detection switch 11 that detects the deviation of the belt 7 has its detection lever 12
is arranged on the small diameter portion 8a side of the pulley portion 8 with respect to the belt 7. As shown in FIG. 5, this detection switch 11 is connected in series with the fan motor 6 to the power supply terminals 13, 13, and opens when a deviation of the belt 7 is detected to cut off the power to the fan motor 6. ing. A power switch 14 operated by an operator is also connected in series with the detection switch 11. Further, the deviated belt 7 can be removed by rotating the restart arm 15 shown in FIG.
2, the belt 7 itself also returns to its normal running position. The restart arm 15 is pressed via the push button 16 to release the return spring 1.
It is designed to rotate against 7. Further, the storage space 18 of the detection switch 11 is covered with a diaphragm 19 to prevent dust from entering.
The tip of the detection lever 12 is inserted into this diaphragm 19 . A rib 20 for placing the belt is provided below the belt 7.

Furthermore, in the vacuum cleaner, as shown in FIG.
A locking means 21 is provided for locking the detection switch 11 in its detection state (the state shown by the dotted line). The locking means 21 is specifically composed of a permanent magnet, and this permanent magnet is clamped to a support frame 22 that is common to the detection switch 11. Elastic shelters 23 are attached to both sides of this permanent magnet 21. In the permanent magnet 21, once the detection lever 12 is pressed by the belt 7 and approaches the attraction range, it strongly attracts the detection lever 12, and the detection lever 12 will not be released from the attraction even if the belt 7 returns afterwards. , the restart arm 15
The detection switch 11 is locked in the detection state, that is, the off state, until the suction is forcibly released by the fan motor 6, thereby avoiding the danger of the fan motor 6 suddenly rotating.

The detection switch 11 for the belt 7 has a built-in snap-action mechanism for a detection lever 24, as shown in FIG. There are other embodiments that lock.

(g) Effects of the invention Since the invention is constructed as described above, the belt can be deflected without changing the overall configuration of the fan motor and its elastic support members, etc., as in the prior art. It can be easily configured by only local improvement of the tensioned pulley part, and the detection operation of the belt is also reliable as there is no need to make difficult adjustments such as the degree of flexibility of the elastic support member as in the prior art. It can enhance sex. Furthermore, since a locking means for locking the belt detection switch in its detection state is provided, it is safe to avoid the danger of the fan motor suddenly rotating when the detection switch is released from the belt.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention,
Fig. 1 is a side view, Fig. 2 is a cross-sectional view, Fig. 3 is a sectional view taken along line X-X in Fig. 2, Fig. 4 is a plan view of the main part, Fig. 5 is a schematic electrical circuit diagram, Figure 6 is the second
A sectional view taken along the Y-Y line in the figure and FIG. 7 are explanatory diagrams of a detection switch provided in another embodiment. 1... Vacuum cleaner body, 4... Suction port, 5... Rotating brush, 6... Fan motor, 7... Belt,
8, 9...Pulley part, 8a...Small diameter part, 11...
Detection switch, 21... Locking means.

Claims (1)

[Scope of utility model registration request] A motor, a suction port, a rotating brush provided facing the suction port, a pulley portion provided on each of the rotating shaft of the motor and the rotating brush, and a motor suspended between the two pulley portions. A belt that transmits the power of the motor to the rotating brush, and a small diameter portion formed in at least one of the two pulley portions so that the diameter gradually becomes smaller in the axial direction, and deviation of the belt toward the small diameter portion is detected. A vacuum cleaner comprising: a detection switch that cuts off power to the fan motor; and locking means that locks the detection switch in the detected state.