JPS624295Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to an electric floor suction device that is connected to the suction side of a vacuum cleaner and forcibly rotates a rotating brush using a commutator motor. It is something.

Conventional technology Conventionally, in this type of electric floor suction device, when the suction load exceeds a certain value, a part of the pipe connecting the suction device and the suction side of the vacuum cleaner is opened to the atmosphere, and the electric There was a device that ensured the amount of air reaching the vacuum cleaner (Utility Model Application Publication No. 139675/1983). In addition, some common floor suction devices have a pressure-responsive valve installed in a part of the suction chamber, and when the suction negative pressure exceeds a certain level, the valve opens, allowing atmospheric air to flow into the suction chamber in a bypass manner ( Publication No. 63963 of Utility Model Application No. 52-63963, Utility Model Application No. 52-
Publication No. 122571).

Problems that the invention aims to solve By the way, when an electric floor suction device is overloaded, unreasonable force is applied not only to the power transmission means between the commutator motor and the rotating brush, but also to the motor itself. It used to be. Therefore,
In the former configuration of the conventional suction device mentioned above, when the suction load exceeds a certain value, a flow of bypass air is generated, but the electric motor continues to be subjected to more force than usual, which sometimes causes it to burn out. Something happened.

Further, in this type of suction tool, the dust scraped up by the rotating brush is conveyed to the vacuum cleaner side by the air flowing through the rotating brush chamber. Therefore, the greater the amount of air flowing through the rotating brush chamber, the better the dust transportability will be. However, in the above-described conventional brush, the bypass air does not flow through the rotating brush chamber, resulting in poor dust transportability.

Furthermore, although the conventional latter type of suction device is improved in terms of dust transportability, simply adopting it in an electric floor suction device does not affect the cooling of the commutator motor; The problem of overheating remains.

The present invention solves these conventional problems and provides an electric floor suction tool that has good dust suction performance, good operability, and is highly safe.

Means for Solving the Problems In order to solve these conventional problems, the present invention has a rotating brush chamber which has a rotating brush, a suction port and a bypass air passage separate from the suction port, and a belt. a commutator motor linked to the rotating brush through the rotary brush, and an on-off valve that normally closes the bypass air passage and opens when the negative pressure in the rotating brush chamber exceeds a certain value, and the bypass air passage The rotary brush chamber faces the exhaust side of the commutator motor, and the rotating brush chamber is connected to the suction side of the vacuum cleaner.

Function According to the present invention, when the suction negative pressure reaches a predetermined value or more, the on-off valve responds to open the bypass air passage, and the air that has cooled the commutator motor flows into the rotating brush chamber in a bypass manner. Therefore, the suction force of the suction tool to the surface to be cleaned does not reach a certain level,
The load on rotating brushes, belts, etc. does not become so large. Furthermore, since the suction force of the vacuum cleaner acts on the exhaust side of the commutator motor, a larger amount of air flows through the motor than in a normal case, ensuring cooling.

Furthermore, since the bypass air flows through the rotating brush chamber, there is no reduction in dust transportability.

Embodiment An embodiment of the present invention will be described with reference to the drawings. 1
is a vacuum cleaner equipped with an electric blower, dust collection bag, etc.
Reference numeral 2 denotes a conductive hose, which has connection parts 3 and 4 at both ends. The connecting portion 3 has a main body connecting pipe fixed thereto and a corded plug 5 connected to the conductive hose 2, which is connected to an outlet 6 provided in the vacuum cleaner main body. Further, a generally dogleg-shaped tip pipe 8 is fixed to the connecting portion 4 to be connected to the extension tube 7. The connecting portion 4 is provided with an outlet 9, and a plug 13 provided on a cord 12 of a commutator motor 11 built into an electric floor suction device 10 (hereinafter abbreviated as the suction device) is connected to the outlet 9. 14 is a running wheel, and 15 is a handle.

The suction tool 10 is equipped with a rotating brush chamber 17 having a rotating brush 16 for cleaning the front rainbow carpet surface, and a commutator motor 11 is disposed on the rear right side of the brush chamber 17 when viewed from the back side. The connected cord 12 is then taken out from the wall. An elastic belt 18 is stretched around the rotating brush 16 and the pulley 19 of the commutator motor 11, and transmits the rotation of the commutator motor 11 to the rotating brush 16. A flexible connecting hose 20 having an intake port is disposed in the center of the suction device 10, and one end is connected to the rotating brush chamber 17, and the other end is connected to a connecting pipe 22 rotatably provided around a shaft 21. Each is connected. 23 is a running wheel, which is pivotally supported on the shaft 21. A holding plate 24 fixes the commutator motor 11. 25 is a shaft presser. 26 is a back plate having a suction port 30, a rotating brush 16, and a commutator motor 1.
1. It is fixed to the back surface of the suction tool 10 so as to cover the connecting hose 20 and the like. 27 is an on-off valve, which is arranged on the belt 18 side of the rear wall of the rotating brush chamber 17;
It is biased by a torsion coil spring 28, and normally the side wall 10a of the suction tool, the back plate 26, and this on-off valve 2
7 to seal the air passage 29. Note that the on-off valve 27 is connected to the boss 1 provided on the suction tool 10.
0b and a back plate 26 so as to be freely openable and closable.
Reference numeral 10c denotes a rib disposed at the front of the on-off valve 27 to provide a bypass air passage 29. When the suction port 30 is closed, the negative pressure in the rotating brush chamber 17 increases due to suction from the vacuum cleaner 1, and the on-off valve 27 rotates against the biasing force of the torsion coil spring 28.

In this case, air flows as shown by the arrows in FIG. Further, the flow of cooling air by the self-cooling fan of the commutator motor 11 installed in the suction tool 10 flows toward the belt 18 as indicated by the arrow in FIG. Therefore, when the on-off valve 27 opens, the exhaust air flows into the rotating brush chamber 17, and the negative pressure within the rotating brush chamber 17 can be lowered. In addition, when the rib 10c is provided at the front of the on-off valve, even if the dirt scraped up by the rotation of the rotating brush is repelled to the on-off valve side, it acts as a partition so that the operation of the on-off valve is not hindered. be.

Effects of the invention Since the invention has the above-mentioned configuration, when a vacuum cleaner is used and the suction tool is used on long-haired or thin-haired carpets, the suction port As the negative pressure in the rotating brush chamber increases, the suction device becomes difficult to operate, and a load begins to be applied to the rotating brush, belt, and commutator motor. At this time, the on-off valve opens and the rotating brush chamber Since the air flows through the suction port, the negative pressure will not exceed a certain level, and the suction port will no longer stick to the carpet surface, making it easier to operate. Furthermore, by operating the on-off valve, the exhaust air from the commutator motor is sucked up by a vacuum cleaner along with the dust scraped up by the brush, which improves the cooling effect and eliminates burnout of the commutator motor and belt breakage. No more dust will stick to the carpet surface again.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a vacuum cleaner and an electric floor suction device showing one embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the suction device, and Fig. 3 is a side view of the suction device with the back plate removed. FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 3, and FIG. 5 is an enlarged cross-sectional view taken along line A--A in FIG. 4. 10... Suction tool, 11... Commutator motor, 16
...Rotating brush, 17...Rotating brush chamber, 18...
...Belt, 27...Opening/closing valve, 29...Bypass air passage. airway.

Claims (1)

[Scope of utility model registration request] A rotating brush chamber having a rotating brush and having a suction port and a bypass air passage separate from the suction port, a commutator motor linked to the rotating brush via a belt, and a rotary brush chamber with the bypass air passage normally closed. The rotary brush chamber is provided with an on-off valve that opens when the negative pressure in the rotating brush chamber exceeds a certain value, and the bypass air passage faces the exhaust side of the commutator motor, and the rotating brush chamber is located on the suction side of the vacuum cleaner. A connected electric floor suction device.