JPS63246120A - Electromotive type suction tool for floor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of an electric floor suction device that is connected to a vacuum cleaner via a hose and an extension tube.

BACKGROUND OF THE INVENTION Conventional electric floor suction devices (hereinafter referred to as suction devices) generally have a structure as shown in Japanese Utility Model Publication No. 10594/1983.

The configuration will be explained below based on one drawing. 6th
In the figure, the suction tool main body 1 has a rotating brush chamber 3 containing a rotating brush 2 at its front, and a connecting pipe 4 communicating with a motor 4 as a drive source for the rotating brush and the rotating brush chamber 3 at its rear. are doing.

Reference numeral 6 indicates bearings disposed at both ends of the rotating brush 2, and reference numeral 6 indicates a belt installed between the rotating brush 2 and the motor 4.

7 is the power cord that supplies power to motor 4.

It is connected to the lead wire 8 from the motor 4.

Note that the suction device main body 1 is formed of upper and lower main body members.

Problems to be Solved by the Invention However, the cleaning surface of this type of driven floor suction tool is a carpet, and during use, the rotating brush 2 gets caught in the edges of the carpet, strings, etc., and the rotating brush 2 becomes unable to rotate. As a result, motor 4 cannot rotate.

In other words, the motor was locked, an overcurrent flowed through the motor 4, and motor abnormalities such as coil burnout occurred.

Moreover, when the one-rotation brush 2 is locked, a load is also applied to the belt 5, reducing the durability of the belt.

The present invention solves the above-mentioned conventional drawbacks, and provides a highly safe electric floor suction tool by incorporating a current fuse, a resistor serving as a protection circuit for the motor, and a positive temperature coefficient thermistor in the main body of the suction tool. With the goal.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a suction tool body with a current fuse, a resistor serving as a motor protection circuit, and a positive temperature coefficient thermistor, and wires them in series.
The resistance values of the resistor and the positive temperature coefficient thermistor are set so that the starting current of the motor is approximately equal to the current when the motor is locked, or the starting current is smaller than the current when the motor is locked.

According to the above invention, when an abnormality occurs in the motor or the wiring section and abnormal current is generated, the current fuse is activated to prevent the suction tool body from emitting smoke or ignition, and when the motor is locked due to the locking of the rotating brush, the positive temperature coefficient thermistor is activated. operates to cut off the current flowing to the motor and prevent motor coil burnout.

Furthermore, the starting current of the motor when the power is turned on is set to be equal to or lower than the current when locked.

Due to the importance of power supply, the current fuse does not operate.

Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, 1o is a vacuum cleaner with a built-in electric blower, dust collection bag, etc., 11 is a hose, and 12 is an extension pipe, which are arranged at the rear of the vacuum cleaner 10 and the suction device main body 13 of the electric floor suction device. The connecting pipes 14 are connected to the connecting pipes 14, respectively. 16 is a moving wheel, and 16 is a handle.

The suction device main body 13 has a rotating brush chamber 18 containing a rotating brush 17 in its front part, and a motor 19 on one side of its rear part.
Motor room 20'i with built-in.

On the opposite side, there is a resistor 21 to protect the motor 19, a positive temperature coefficient thermistor 22, and a current fuse 2 to prevent ignition and smoke.
Each of them has a circuit chamber 25 equipped with a printed circuit board 24 incorporating electrical components such as No. 3, etc., and an intake passage 26 communicating with the rotating brush chamber 18 and the connecting pipe 14 are arranged at the center of the rear part.

Reference numeral 27 denotes a suction port arranged at the lower part of the rotary brush chamber 18, and allows the single-rotation brush 17 to peek out onto the floor surface.

The suction device main body 13 has an upper main body member 28. Lower body member 29. The brush cover 30 forms an outer shell to form each of the above-mentioned rooms. 31 is a rotating brush 17 and a motor 19
with a belt installed between them.

The rotation of the motor 19 is transmitted to the rotating brush 17.

The rotating brush 17 is composed of a main brush 32, an auxiliary brush 33, a bearing 34, etc., and the bearing 34 is arranged between the main brush 32 and the auxiliary brush 33 and at the other end of the main brush 32, and is connected to the lower body member 29 and the brush cover. It is held by a bearing holding part 35 of 30.

The auxiliary brush 33 rotates in conjunction with the main brush 32, and the belt 31 is installed at an end of the main brush 32 on the opposite side from the auxiliary brush 33.

Said auxiliary brush 33. Hair 36 is implanted on the outer periphery of the main brush 32, a bearing 34 is inserted into the main brush 32 and rotatably supports a shaft 37, and an auxiliary brush 33 is attached to the end of the shaft 37.
is inserted and fixed.

The bristles 36 are installed on the auxiliary brush 33 at an angle, and the bristles 36 are attached to the main body of the suction tool so that the bristles 36 are exposed to the outside through a side end open chamber 38 in which the side ends of the lower main body member 29 and the brush cover 300 are opened. It is placed at the very edge of 13 to ensure that every corner of the room can be cleaned. Note that the rigid portion of the auxiliary brush 33 is not projected from the side surface of the suction device main body 13 so as not to impede usability and safety.

Reference numeral 39 denotes a bypass passage disposed at the rear upper part of the bearing holding section 35 so as to communicate the one-rotation brush chamber 18 and the side end open chamber 38 and guide the dirt scraped up by the auxiliary brush 33 to the rotation brush chamber 18. It has become.

The suction tool main body 13 is used to clean carpets, and during cleaning, the ends of the carpet, strings, etc.
Motor 7 becomes entangled and cannot rotate once, and motor 19 also becomes unable to rotate and becomes locked, causing a high current to flow.

At this time, a similar high current flows through the resistor 21, the positive temperature coefficient thermistor 22, and the current fuse 23;
Before the motor 19 operates and before the coil burns out, the resistance value of the positive temperature coefficient thermistor 22 suddenly increases, and the current flowing to the motor 19 is cut off to prevent the motor 19 from burning out.

Current fuse 23 shorts the coil of motor 19.

This prevents the suction device main body 13 from emitting smoke or catching fire when the positive temperature coefficient thermistor 22 is short-circuited or the connection section is abnormal.

Furthermore, if a high current flows instantaneously at the time of starting the motor 19 and is repeated, the current fuse 23 may operate. By setting the resistance value of the motor 19 and the resistance value of the positive characteristic thermistor 22, the current at startup of the motor 19 and the current at the time of motor locking are limited, and the current at startup and the current at locking are approximately equal, or the current at locking is The starting current is set to be smaller than the current.

Therefore, the current fuse 23 can be set to have high durability and reliability without the above-mentioned malfunction, and by setting the resistance value described above, the current flowing to the motor 19 at startup etc. can be suppressed, thereby increasing the durability of the motor 19. , reliability is also improved.

In this case, if the starting current of the motor 19 becomes higher than the locking current, if a highly reliable current fuse 23 that does not operate with the starting current is set, the motor 19 will emit smoke and the suction tool body 13 will be deformed. From current fuse 2
This solves the problem of the current fuse being unable to exhibit its effectiveness.

Effects of the Invention As described above, the present invention allows the suction tool to be used normally without operating the current fuse when the power is turned on or off by setting the resistance value of the resistor and positive temperature coefficient thermistor installed in series with the motor. If the end of the carpet gets caught and the motor becomes unable to rotate, the positive temperature coefficient thermistor operates to prevent the motor from burning out, allowing for safe use without causing smoke or ignition from the suction tool. It is.

In addition, if a motor abnormality or short circuit occurs for some reason, the current fuse will operate, providing a highly safe and reliable electric floor suction device with a built-in double safety device. .

In particular, as mentioned above, since the motor's starting current is regulated, it is easy to set the current fuse, and it can be activated immediately if an abnormality such as a short circuit occurs.

This can prevent abnormalities to other parts, making it extremely safe.

[Brief explanation of drawings]

FIG. 1 is a bottom view of an electric floor suction device according to an embodiment of the present invention, with the lower main body member removed. Fig. 2 is an external perspective view showing the electric floor suction device connected to a vacuum cleaner, Fig. 3 is a sectional view of the electric floor suction device, Fig. 4 is a sectional view of the same essential parts, and Fig. 5 is a sectional view of the electric floor suction device. This figure is the same circuit diagram, and FIG. 6 is a bottom view of the conventional electric floor suction tool with the lower main body member removed. 13... Suction tool body, 17... Rotating brush, 18... Rotating brush chamber, 19...
・Motor, 21... Resistor, 22...
Positive characteristic thermistor, 23...Current fuse. Name of agent: Patent attorney Toshio Nakao and 1 other person19
-Motor 2I-・-Koyu Uri Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] The main body of the suction tool is equipped with a rotating brush that scrapes dirt from the carpet surface, a motor that is its driving source, a protection circuit for the motor, a current fuse, etc., and the current fuse, the resistance of the protection circuit, the positive temperature coefficient thermistor, and the motor are connected in series. wiring, and the resistance values of the resistor and positive temperature coefficient thermistor and the characteristics of the motor are set so that the starting current of the motor is approximately equal to the current when the motor is locked, or the starting current is smaller than the current when the motor is locked. Suction device for type floor.