JPH08512A - Suction port body for vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent belt skipping from occurring by always keeping distance between a pulley on a driving side i.e., motor side and the one on a driven side i.e., rotary brush side constant. CONSTITUTION:The rotary brush 3 is driven by a motor 2 via a timing belt 9, and the pulley 7 around which the timing belt 9 is stretched in the rotary brush 3 is provided at a part other than both-end parts where the rotary brush 3 is pivotally supported. Ball bearings 13, 12 are provided near by the driving shaft and the pulleys 7, 8 around which the belt 9 of the brush is stretched, respectively, and a rigid member 14 coming into contact with the outer wheel of each bearing is provided on the lower case 1 of this suction port body along a straight line connecting those bearings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction port body of an electric vacuum cleaner.

[0002]

2. Description of the Related Art Generally, a vacuum cleaner having a rotary brush driven by a dedicated motor is known as a suction port body. Then, there is also one in which this rotating brush is driven via a timing belt. Further, as a suction port body of an electric vacuum cleaner, there is also known a suction port body having a substantially T-shape so that cleaning, for example, from a front side of a leg of a table to a back side thereof can be easily performed on the floor. In order to provide the rotary brush and to make the suction port body substantially T-shaped, it is necessary to dispose a pulley to which the timing belt is hung at a portion except both ends where the rotary brush is supported.

By the way, when the floor surface to be cleaned is a carpet or carpet with long bristles, the rotating load of the rotating brush becomes abnormally large, and the timing belt itself has no elongation. Is well known. When the rotating brush is driven via this timing belt, when the load becomes abnormally large as described above, the shaft of the rotating brush or the motor, the bearing, or the case supporting the bearing bends, which causes the motor and the rotating brush to move. The distance between the pulleys shrinks slightly,
This may cause belt skip. Belt skips add excessive mechanical fatigue to belts, pulleys and bearings.

[0004]

As described above, in the mechanism for transmitting the rotation via the belt, it is important to always keep the distance between the driving pulley and the driven pulley constant. The present invention relates to a suction port body of an electric vacuum cleaner having a rotating brush, wherein the rotating brush is driven by a motor via a timing belt, and a pulley for hanging the timing belt in the rotating brush is borne by the rotating brush. The suction port body of the electric vacuum cleaner, which is provided at a portion excluding both end portions, can always keep a constant distance between the driving side, that is, the motor side pulley and the driven side, that is, the rotating brush side pulley. It is intended to provide.

[0005]

SUMMARY OF THE INVENTION To solve the above problems and achieve the above objects, the present invention relates to a suction port body of an electric vacuum cleaner having a rotating brush, the rotating brush comprising a timing belt. The pulley which is driven by a motor through which the timing belt of the rotating brush is hung is provided at a portion excluding both ends where the rotating brush is borne, and the driving shaft of the motor and the timing belt of the rotating brush. Ball bearings are provided in the immediate vicinity of the pulleys for hanging, and a rigid member that comes into contact with the outer ring of each ball bearing is provided in the case of the suction port body along a straight line connecting these ball bearings. It is what

[0006]

In the suction inlet of the electric vacuum cleaner constructed as described above, the distance between the pulleys does not change even if the load of the rotating brush becomes abnormally large. Therefore, the above-mentioned belt skip is substantially eliminated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows the inside of the vacuum cleaner by removing the upper case of the main part of the suction port. As is well known, the motor 2 is fixed to the lower case 1, and the rotating brush 3 is housed therein. Both ends of the rotary brush 3 are rotatably attached to the lower case 1 by bearings 4 and 4 (only one bearing is shown). And
Bristles 5 and beaters 6 are provided on the rotary brush 3. Pulleys 7 and 8 are fixed to a portion of the rotating brush 3 excluding the both ends and a shaft of the motor 2, respectively.
A timing belt 9 is hung on these pulleys 7 and 8. Further, an opening 10 serving as a suction port is provided on the bottom surface of the lower case 1 along the rotary brush 3, and a cover 11 for covering the belt 9 is integrally formed. The suction port body of the electric vacuum cleaner configured in this way is already known.

Well-known ball bearings 12 and 13 are provided in the vicinity of the shaft of the motor 2 and the pulleys 7 and 8 of the rotary brush 3, and these bearings 12 and 13 are provided.
A rigid member 14 made of a metal plate that is in contact with the outer rings of the bearings 12 and 13 is arranged along a straight line connecting the two. The rigid member 14 is fixed to the lower case 1 by screws (not shown).

In the suction port body of the electric vacuum cleaner constructed as described above, the distance between the pulleys 7 and 8 is the rigid member 14.
Since it is held constant by the above, the above-mentioned belt skip does not occur. In addition, such a configuration is used when the tip of the shaft of the motor 2 is not supported by the lower case 1 as in the above-described embodiment, and the rotating brush 3
It is particularly advantageous when the pulley 7 of FIG. 1 is remote from the bearing 4 of the rotating brush 3.

[0010]

As described above, in the suction port body of the electric vacuum cleaner of the present invention, the distance between the shaft of the motor 2 and the pulleys 7 and 8 provided on the rotary brush 3 can be kept constant. Therefore, the belt skip described above can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Lower Case 2 Motor 3 Rotating Brush 4 Bearing 5 Flocking 6 Beater 7,8 Pulley 9 Timing Belt 10 Opening 11 Cover 12,13 Ball Bearing 14 Rigid Member

Claims (1)

[Claims] 1. A suction port body of an electric vacuum cleaner having a rotating brush, wherein the rotating brush is driven by a motor via a timing belt, and a pulley for hanging the timing belt in the rotating brush has a bearing The ball bearings are provided near the pulleys for hanging the timing belt on the drive shaft of the motor and the rotary brush, respectively, in a straight line connecting these ball bearings. A suction member of the vacuum cleaner, characterized in that a rigid member that comes into contact with the outer ring of each ball bearing is provided in a case of the suction member.