JPS6152686B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a floor cleaning tool.

Conventionally, a main body case that runs on the floor is provided with a suction air passage that is maintained in a negative pressure state and a brush chamber that has a suction opening that opens on the bottom surface, and a brush chamber that is driven by a motor is provided in this brush chamber. There is a floor cleaning tool which uses its brush to release dust adhering to the floor surface and collects the dust by suction airflow. In this type of floor cleaning tool, when the floor cleaning tool is lifted during cleaning, there is a risk that a finger may be drawn in through the suction opening because the brush is rotating.

In order to avoid this risk, there are devices in which a soft member is disposed around the suction opening, and when the finger is pulled in, the soft member deforms to make it easier to pull the finger out. However, although this type of brush is quite effective, since the brush is still driven, it is easy to get caught inside when the finger is deeply retracted, so it is not necessarily safe.

For this reason, it may be possible to make the suction opening large from the beginning to create a space large enough to prevent fingers from getting caught, but this would result in insufficient suction wind speed to achieve the original dust suction effect. It has the disadvantage of decreasing.

The present invention has been made in view of these points, and an object of the present invention is to provide a floor cleaning tool that has improved safety without impairing its dust-sucking effect.

In this invention, a suction air passage maintained in a negative pressure state is formed in a main body case running on a floor surface, and a brush chamber having a horizontally elongated suction opening is formed in the lower surface, and the brush chamber is connected to the suction opening. brushes are arranged along the main body case, a rotary drive unit is installed in the main body case, and a pulley of the rotary drive unit and a pulley of the brush are provided on the side of the main body case and are connected to each other by a belt. the length of the belt is set to have an amount of slack that does not normally cause a rotation transmission action between the pulleys, and the opening amount of the suction opening on the lower surface of the main body case is limited. a protective plate is provided, the protective plate is mounted rotatably inward from a horizontal position that limits the opening amount of the suction opening, and is biased by a spring so as to return to the horizontal position; A pressing member that is provided in the transmission chamber and moves with the rotation of the protection plate is integrally connected to the protection plate, and the protection plate limits the opening amount of the suction opening. A pressing member presses between the pulleys of the belt to generate tension for transmitting driving force to the belt, and the pressing member releases the belt from being pressed when the protective plate rotates inward. It is characterized by the following. Therefore, since the protective plate is normally located at a position that limits the amount of opening of the suction opening, the suction wind speed at the suction opening is high, and the dust suction effect is good. Sometimes, the protection plate rotates inward against the biasing force, and this rotation enlarges the suction opening, and the pressing member that was pressing the belt releases the pressure on the belt, causing the belt to loosen. Then, the rotational driving force of the brush is lost and the brush stops, thereby greatly increasing safety.

An embodiment of the present invention will be described based on the drawings.
Reference numeral 1 denotes a vacuum cleaner, and a suction hose 3 and an extension pipe 4 are sequentially connected to a dust collecting section 2 of the vacuum cleaner. Then,
A main body case 5 that runs on the floor is provided.
The main body case 5 is constructed by assembling an upper case 8 and a lower case 9 with a rotary tube 6 connected to the extension tube 4 and a bumper 7 sandwiched between the upper and lower sides. This main body case 5 has partition walls 10, 11, 12 whose edges are joined at the top and bottom.
are formed in the upper case 8 and the lower case 9, thereby creating a brush chamber 14 that accommodates the brush 13 and a motor chamber 16 that accommodates the motor 15 that is a rotational drive section.
A transmission chamber 17 and a suction air passage 18 connected to the rotary tube 6 are formed. Furthermore, a suction opening 19 is formed at the bottom of the brush chamber 14, and a partition wall 10 is formed on the lower case 9 side. A ventilation hole 20 is formed in the middle part. A pulley 21 connected to the motor 15 and a pulley 22 fixed to the brush 13 are connected by a belt 23 in the transmission chamber 17. The length of the belt 23 is set to a length that does not exhibit a rotation transmission function.

A protection plate 24 extending along the longitudinal direction of the brush 13 is attached to the lower surface of the brush chamber 14 so as to be movable up and down. This protection plate 24 limits the opening amount of the suction opening 19 in a horizontal state that coincides with the lower surface of the main body case 5, and is attached so as to rotate inward from this position. Then, it is biased toward the horizontal state by a spring, which will be described later. Furthermore, support shafts 26 supported by the side walls 25 of the brush chamber 14 are provided on both sides of the protection plate 24 . Furthermore, the transmission chamber 1
7 includes an arm 28 and a tension roller 29 supported by the arm 28 and joined to the belt 23;
A pressing member 30 consisting of the following is provided. One end of the arm 28 is connected to one end of the support shaft 26 with a screw 27 while being prevented from rotating. As a means for preventing rotation, for example, a square boss 31 is formed on the arm 28, and a square hole (not shown) into which the square boss 31 fits is formed on the support shaft 26. Then, one end of the spring 32 wound around the support shaft 26 is brought into contact with the bottom of the transmission chamber 17, and the other end is brought into contact with a pin 33 provided upright on the arm 28, whereby the protective plate 24 and the arm 28 are separated from each other as shown in FIG. And in FIG. 4, it is biased counterclockwise.

In such a configuration, the suction air passage 18 and the brush chamber 14 are maintained in a negative pressure state by driving an electric blower (not shown) of the vacuum cleaner 1. Then, by driving the motor 15, the brush 13 rotates to release dust from the floor surface and suck the dust through the suction opening 19. If you accidentally put your hand into the suction opening 19, the protective plate 24
rotates around the support shaft 26 to widen the opening amount of the suction opening 19. The arm 28 integrally rotates in conjunction with the movement of the protection plate 24, and the tension roller 29 loosens the belt 23 to cut off rotation transmission from the motor 15 to the brush 13. There is therefore no risk of fingers being drawn into the brush 13. Protective plate 2
4, the protection plate 24 returns to its original position due to the force of the spring 32, thereby narrowing the opening amount of the suction opening 19. This increases the suction wind speed and promotes the suction action.

Further, the airflow inside the brush chamber 14 is restricted by the ventilation holes 20, so that the wind speed is high in the central portion near the ventilation holes 20, but slow on both sides. Therefore, there is a risk that dirt may become clogged on both sides, but in such a case, rotating the protection plate 24 toward the partition wall 10 will create a narrow air passage between the protection plate 24 and the partition wall 10. is formed, whereby the brush chamber 14
Debris clogged on both sides can be sucked in by the high-velocity suction flow.

Note that an electric blower and a dust collection chamber may be provided within the main body case 1. Further, a turbine may be used as the rotational drive unit.

Since the present invention is configured as described above, the protection plate is normally located at a position that limits the opening amount of the suction opening, so the suction wind speed at the suction opening is high, and thereby the dust suction effect is good. In the unlikely event that your finger is pulled in, the protective plate will rotate inward against the biasing force, and this rotation will enlarge the suction opening and cause the pressing member that was pressing the belt to press down on the belt. In order to release the belt, the belt becomes slack and the rotational driving force of the brush is lost, and the brush stops, which has the effect of greatly increasing safety.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is a reduced side view showing the overall configuration, Figure 2 is a plan view of the lower case, Figure 3 is a vertical side view of the main case taken in section along the line A-A in Figure 2, and Figure 4
The figure is a longitudinal side view of the main body case taken along line B--B in FIG. 2, and FIG. 5 is an exploded perspective view showing the relationship between the protection plate and the pressing member. 5...Body case, 13...Brush, 14...
Brush chamber, 15...Motor (rotation drive unit), 18
... Suction air path, 19 ... Suction opening, 23 ... Belt, 24 ... Protective plate, 30 ... Pressing member.

Claims (1)

[Claims] 1 A suction air passage maintained in a negative pressure state in the main body case running on the floor and a brush chamber having a horizontally elongated suction opening on the lower surface are formed in communication with each other, and the brush chamber is arranged along the suction opening. A power transmission comprising brushes arranged in a row, a rotary drive unit mounted in the main body case, and a pulley of the rotary drive unit and a pulley of the brush that are connected to each other by a belt on the side of the main body case. A chamber is formed, the length of the belt is set to have a slack amount that does not normally transmit rotation between the pulleys, and a protection plate is provided on the lower surface of the main body case to limit the opening amount of the suction opening. The protective plate is mounted rotatably inward from a horizontal position that limits the opening amount of the suction opening and is biased by a spring so as to return to the horizontal position. A pressing member that is located within the transmission chamber and moves with the rotation of the protection plate is integrally connected, and in a horizontal state in which the protection plate limits the opening amount of the suction opening, the pressing member A tension force for transmitting driving force is generated in the belt by pressing between the pulleys of the belt, and the pressing of the belt by the pressing member is released when the protection plate is rotated inward. Features floor cleaning tools.