JPH0228860Y2 - - 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 rotary 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 switch detects the deviated belt and stops the fan motor as a drive source for the rotating brush, but the dust stirred up by the rotating brush is There is a drawback that the switch is reached along the belt and its running space, and the switch becomes inoperable due to the dust after years of use.

(c) Problems to be solved by the invention The present invention solves the above-mentioned drawbacks and prevents dust from reaching the belt 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. It has a pulley part provided on each of the brushes, and a belt stretched between the two pulley parts to transmit the power of the motor to the rotating brush, and at least one of the pulley parts has a diameter that gradually becomes smaller in the axial direction. A detection switch for the belt is arranged on the small diameter side of the pulley part, and a diaphragm is interposed between the belt and the switch,
A space on the side where the switch is installed and a space where the belt is installed are partitioned, and the tip of the detection lever of the switch is made to penetrate through the diaphragm and protrude into the space on the side where the belt is installed. There is.

(E) Effect According to the present invention, the dust stirred up by the rotating brush is blocked by the diaphragm and does not reach the space on the side where the switch is installed. Further, when the rotating brush is locked, the belt shifts toward the small diameter portion of the pulley portion and comes into contact with the tip of the detection lever of the switch.

(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. Reference numeral 7 denotes a belt for transmitting driving force to the rotating brush 5, which is stretched between the rotating shaft 6b of the fan motor 6 and pulley portions 8 and 9 provided near one end of the rotating brush 5, respectively. . Reference numeral 10 indicates wheels (only one of which is shown) disposed on both sides of the rear part of the cleaner body 1.

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.

As shown in FIG. 4, the pulley portion 8 of the fan motor 6 is tapered so as to gradually become smaller in diameter in the axial direction. In this tapered pulley portion 8, 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. As a result, the belt 7 becomes deviated toward the small diameter portion 8a as shown by the chain line. As a configuration for deflecting the belt 7, the pulley portion 9 on the rotating brush 5 side may be tapered instead of the pulley portion 8, or both pulley portions 8 and 9 may be tapered with a looser taper degree. It's okay.

a detection switch 1 for detecting deviation of the belt 7;
No. 1 has its detection lever 12 disposed on the small diameter portion 8a side of the pulley portion 8 with respect to the belt 7. This detection switch 11 is connected to the power supply terminal 1 as shown in FIG.
3 and 13 are connected in series with the fan motor 6, and when a deviation of the belt 7 is detected, the opening is opened to cut off the power supply to the fan motor 6. A power switch 14 operated by an operator is also connected in series with the detection switch 11.

Further, the displaced belt 7 can be removed by rotating the restart arm 15 shown in FIG.
Through this, the belt 7 itself also returns to its normal running position. The restart arm 15 is pressed via a push button 16 and a return spring 17 is activated.
It is designed to rotate against the A rib 18 for placing the belt is provided below the belt 7.

As shown in FIG. 4, the detection switch 11 is associated with a locking means 19 for locking the switch 11 in its detection state (the state indicated by the dotted line). This locking means 19 is specifically composed of a permanent magnet, and this permanent magnet is connected to the detection switch 11.
It is clamped to a common support frame 20. Elastic shelters 21 are attached to both sides of this permanent magnet 19. With permanent magnet 19, detection lever 1
2 is pressed by the belt 7 and once approaches the suction range, it strongly attracts this detection lever 12, and if the belt 7 returns after that, the detection lever 12
The detection switch 11 is locked in the detection state, that is, the off state, until the suction is forcibly released by the restart arm 15, thereby avoiding the danger of the fan motor 6 suddenly rotating. ing.

Further, as shown in FIG. 7, the detection switch 11 for the belt 7 has a built-in snap-action mechanism (not shown) for a detection lever 22, and the detection lever 22 is in the on position shown by a solid line or the off position shown by a chain line. Selective locking is also implemented.

Furthermore, as shown in FIGS. 4 and 6, a thin and elastic diaphragm 23 is interposed between the belt 7 and the detection switch 11.
1 installation side space 24 and belt 7 installation side space 25
is partitioned off. The diaphragm 23 is made of a thin rubber material or the like to increase elasticity. The upper and lower edges of the diaphragm 23 are wall portions 26 and 27 defining the space 25 and the space 24, respectively.
It is glued or screwed (not shown) to.
Both side edges of the diaphragm 23 are also connected to the support frame 20.
etc. are similarly fixed. Further, the tip end 12a of the detection lever 12 of the switch 11 penetrates the diaphragm 23 and projects into the space 25 on the side where the belt 7 is disposed, so that it is pushed by the belt 7 when it is deflected. The through hole of the detection lever 12 is formed to have a cross-sectional area equal to or smaller than the cross-sectional area of the lever, and is in close contact with the lever 12 to prevent dust from entering through the through hole. Tip 12a of detection lever 12
is made of a material with low frictional resistance, such as metal, and is curved so as to make smooth contact with the belt 7.

(g) Effects of the invention Since the invention is constructed as described above, the diaphragm can be used to prevent dust scraped up by the rotating brush from entering the space on the side where the belt is installed and into the space where the switch is installed. Therefore, it is possible to prevent the switch from becoming inoperable due to the dust during long-term use. Furthermore, since the tip of the detection lever of the switch penetrates the diaphragm and protrudes into the space on the side where the belt is disposed, the detection lever can smoothly detect the belt, and therefore the diaphragm comes into contact with the belt. Unlike the case of indirect detection, it is possible to eliminate the fear that the thin diaphragm will come into frictional contact with the belt and be damaged.

[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 schematic electrical circuit diagram, Figure 6 is the second
A cross-sectional view taken along the Y-Y line in the figure and FIG. 7 are explanatory views of 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, 12...Detection lever, 12a...
...Tip portion, 23...Diaphragm, 24...Switch arrangement side space, 25...Belt arrangement side space.

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 for transmitting the power of the motor to a rotating brush; at least one of the pulley parts is tapered so that the diameter gradually becomes smaller in the axial direction; and a detection switch for the belt is provided on the small diameter part side of the pulley part. A diaphragm is interposed between the belt and the switch to partition a space on the side where the switch is installed from a space where the belt is installed, and a tip of the detection lever of the switch. . A vacuum cleaner, characterized in that the diaphragm is penetrated and protruded into a space on the side where the belt is provided.