JPH0228861Y2 - - 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 filed by the applicant of the present invention in Utility Model Application No. 176898/1987, a rotating brush is provided at the suction port of a vacuum cleaner body with a built-in fan motor, and the rotating brush is driven. A force transmission belt is stretched between pulley portions provided on each of the fan motor and the rotating brush, and at least one of the pulley portions is tapered to have a diameter gradually smaller in the axial direction, and the pulley By disposing a detecting switch for the belt on the small diameter side of the part, when the rotating brush is locked due to carpet wrapping, etc., the belt with increased tension is moved to the pulley. The belt is slid along the tapered surface, and the deviated belt is detected by the switch to stop the fan motor serving as the drive source for the rotating brush.

However, if the belt becomes loose, its tension decreases and it becomes unable to bias the lever of the switch against its spring pressure, and also becomes loosened and misaligned, making it unable to contact the switch lever. This has the disadvantage that the energizing operation is uncertain.

(c) Problems to be solved by the invention The present invention solves the above-mentioned drawbacks and ensures that the detection switch is reliably pushed by the belt.

(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. It has a driving pulley part and a driven pulley part provided on each of the brushes, and 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 pulley parts is connected to its axis. The belt is tapered so that the diameter gradually becomes smaller in the direction, and a detection switch for the belt is provided on the small diameter side of the pulley portion, and a stopper is provided on the tension side of the belt to prevent downward deviation of the belt. The present invention is characterized in that the detection part of the switch is eccentrically arranged upward with respect to the contact surface of the stopper.

(E) Effect According to the present invention, when the rotating brush is locked, a slip occurs between the belt and the pulley, the tension of the belt increases, and the belt slips along the tapered surface of the pulley. It deviates toward the small diameter portion and pushes the detection switch on the tension side upstream of the drive pulley. The downward deviation of the belt is prevented by the stopper, and the upward deviation is covered by the upwardly eccentric switch detecting section, so that the belt does not shift relative to the switch detecting section.

(f) Examples Next, one embodiment of the present invention will be described.

In FIG. 1, 1 is a vacuum cleaner body of an upright type vacuum cleaner, 2 is a handle body, and 3 is a dust collecting section.
The handle body 2 is rotatably connected to the rear part of the cleaner body 1, and the dust collection part 3 is bag-shaped and its lower end communicates with the inside of the cleaner body 1.

In Figures 2 and 3, numeral 4 is a suction port provided at the front of the lower surface of the vacuum cleaner body 1, and 5 is a rotating brush provided in the suction port 4, which can be used to clean carpets, floors, etc. This is to remove attached dirt. A fan motor 6 is supported by a holder 7, and its fan (not shown) is positioned within a ventilation path (not shown). The other end of this ventilation path is the vacuum cleaner body 1
It opens at the rear, and the dust collecting section 3 is connected to that part. Reference numeral 8 denotes a belt for transmitting driving force to the rotating brush 5, which is stretched between a driving pulley section 10 and a driven pulley section 11 provided at the rotating shaft 9 of the fan motor 6 and the end of the rotating brush 5, respectively. has been done. Reference numeral 12 denotes wheels (one of which is not shown) disposed on both sides of the rear part of the cleaner body 1.

In the vacuum cleaner configured as described above, 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 floor of the carpet and collects it in the dust collecting section 3 through the ventilation path.

The drive pulley portion 10 of the fan motor 6 is the fourth
As shown in the figure, it is tapered so that the diameter gradually becomes smaller in the axial direction. In the driven pulley section 11, when the rotating brush 5 is locked, the driven pulley section 1
1 and the belt 8, the tension of the belt 8 increases, and as a result, the belt 8 becomes deviated along the tapered surface of the drive pulley portion 10 toward the small diameter portion 10a as shown by the chain line. As a configuration for deflecting the belt 8, the driven pulley portion 11 may be formed into a tapered shape instead of the driving pulley portion 10. Alternatively, both pulley portions 10 and 11 may be tapered with a looser taper degree. A detection switch 13 for detecting the deviation of the belt 8 is disposed on the small diameter portion 10a side of the drive pulley portion 10 with respect to the belt 8, and a detection lever 14 is pressed by the belt 8 and is displaced from the solid line position to the dotted line position. do. In the detection switch 13, the permanent magnet 15 attracts and locks at the dotted line position.
Even if the belt 8 returns after that, the detection lever 14 will not be released by suction, and the restart arm 1 will be described later.
The fan motor 6 is locked in the off state until it is forcibly pushed at step 6, thereby avoiding the danger of the fan motor 6 suddenly rotating.

As shown in FIG. 5, the detection switch 13 is connected in series with the fan motor 6 to the power terminals 17, 17, and is opened to cut off the power to the fan motor 6 when a deviation of the belt 8 is detected. There is. An operation switch 18 is also connected in series with the detection switch 13.

The belt 8, which has deviated toward the small diameter portion 10a, pushes the detection lever 14 at the point indicated by the chain line by rotating the above-mentioned restart arm 16 shown in FIG. 6 in the clockwise direction. The belt 8 itself also returns to its normal running position via this detection lever 14. The restart arm 16 is pressed via a push button 19 to rotate against a return spring 20. Also, the storage space 21 of the detection switch 13 is provided by the diaphragm 2.
2 is covered to prevent dust from entering. A detection portion 14a of the detection lever 14 passes through this diaphragm 22.

In the vacuum cleaner, a rib-shaped stopper 23 is provided on the upstream side of the drive pulley portion 10 of the belt 8 to prevent the belt 8 from shifting downward. The upstream side of the drive pulley section 10 is also called the tension side, and has a large tension and can sufficiently push the detection lever 14 when the tension is displaced. Further, the detection portion 14a of the switch 13 is eccentrically arranged upward with respect to the contact surface 23a of the stopper 23. Specifically, the detection unit 14a
The center portion b of the vertical width a is eccentrically upward by a distance C with respect to the contact surface 23a. For this reason,
Even if the belt 8 shifts upward, the detection part is also eccentrically upward so as to cover this, so the belt 8
surely abuts on the detection part 14a.

(G) Effects of the invention Since the invention is constructed as described above, when the rotating brush is locked, a slip occurs between the belt and the pulley, increasing the tension of the belt, and this belt is caused by the taper of the pulley. It is possible to forcefully push the detection switch by using the tension on the tension side of the belt by deflecting it along the surface toward the small diameter side, and the stopper prevents the belt from deflecting downward and prevents it from deflecting upward. is also covered by the switch detection part eccentrically upward,
It is also possible to prevent the belt from shifting upward relative to the switch detection section, and therefore the belt can accurately push the switch and reliably stop the fan motor.

[Brief explanation of the drawing]

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 main part electric circuit diagram, FIG. 6 is a sectional view taken along the line Y--Y in FIG. 2. 1... Vacuum cleaner body, 4... Suction port, 5... Rotating brush, 6... Fan motor, 8... Belt, 1
0... Drive pulley part, 10a... Small diameter part, 11...
...Followed pulley section, 13...Detection switch, 14a
...detection section, 23 ... stopper, 23a ... contact surface.

Claims (1)

[Scope of utility model registration request] A motor, a suction port, a rotating brush provided facing the suction port, a driving pulley portion and a driven pulley portion provided on each of the rotating shaft of the motor and the rotating brush, and between the two pulley portions. a belt that is stretched across the belt and transmits the power of the motor to the rotating brush, and at least one of the pulley portions is tapered so as to gradually become smaller in diameter in the axial direction;
A detection switch for the belt is provided on the small diameter side of the pulley portion, a stopper is provided on the tension side of the belt to prevent downward deviation of the belt, and the detection portion of the switch is A vacuum cleaner whose stopper is eccentrically positioned upward relative to the contact surface.