JPH0667367B2 - Shaft holder for rotating brush in vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] Generally, as an electric vacuum cleaner, an electric vacuum cleaner main body incorporating a suction machine, a motor for driving the suction machine, a filter for dust filtration, and the like, and There is known a suction hose to be attached, a telescopic tube coupled to the tip of the hose, and a suction port body having a rotating brush attached to the tip of the telescopic tube.

In the electric vacuum cleaner as described above, dust is sucked together with air from the suction port body through the suction hose and the expansion tube by the suction device, and the dust is filtered by the filter so that only substantially air is discharged, The floor surface is cleaned by moving the suction port body along the floor surface to be cleaned.

The rotating brush is driven by a dedicated motor or a turbine rotated by a suction airflow.

The present invention relates to a holder for holding a shaft on which the rotary brush is rotatably supported.

[Prior Art] Generally, the rotary brush described above uses a belt (which may be a toothed belt) as a rotation transmission means between the motor and a turbine for driving the rotary brush. If the tension of this belt is weak, slipping (skipping in the case of a toothed belt) may occur, so it is necessary to maintain the tension at a predetermined level. As one of means for maintaining this tension, elastically holding the shaft of the rotating brush is performed.

Further, as shown in FIG. 4, the rotary brush has a beater 2 composed of a spiral ridge and a flocked brush 3 arranged in a spiral shape on the peripheral surface of the rotary brush 1. The rotation of the rotary brush 1 causes the beater 2 and the brush 3 to kick the bristles of the carpet, so that the rotary brush receives an intermittent force in the forward direction, and the force causes the rotary brush to move in a direction parallel to the surface of the carpet. Vibrate. In order to absorb this vibration, it is necessary to elastically hold the shaft 4 of the rotating brush 1.

In FIG. 4, reference numeral 5 denotes a bearing such as a bearing, which is fixed to the inner circumference of the rotating brush 1 and is rotatably supported by the shaft 4. Reference numeral 6 is a driven pulley on which the belt is hung, and is formed integrally with the rotating brush 1.

Incidentally, the above-mentioned vibration may damage the bearing 5 made of the above-mentioned bearing or loosen the set screw or the like attached to the housing of the suction port body.

As described above, in order to elastically hold the shaft 4 of the rotary brush 1, the holder shown in FIG. 5 has been conventionally used. In FIG. 5, reference numeral 7 is a metal plate, and the non-circular portion 8 formed at the end of the shaft 4 described in FIG. 4 is fitted to the plate surface of the metal plate so as not to rotate. Holes 9 are provided, and rubber dampers 10 are provided on both side edges and the lower edge of the metal plate.
Surrounded by Reference numeral 11 indicates a part of the lower side of the housing of the suction port body, and a groove 12 into which the rubber damper 10 is fitted is provided.

In the holder described above, the non-circular portion 8 of the shaft 4 of the rotary brush 1 is fitted into the hole 9 of the metal plate 7, and then the rubber damper 10 of the holder is fitted into the groove 12, so that a housing not shown is shown. The holder is fixed to the casing by mounting and mounting the upper side of the casing on the lower side 11 of the casing, and the shaft 4 is elastically held by the casing via the rubber damper 10.

[Problems to be Solved by the Invention] In the above-described conventional holder, since the rubber damper 10 is used, if it is constantly pressed in one direction by the belt tension, the element may be deformed, and the change over time may occur. As a result, sufficient elasticity may not be obtained.

Further, since the conventional holder is composed of a composite part composed of the metal plate 7 and the rubber damper 10, its structure is complicated and relatively expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the related art, to provide a holder that can ignore changes in features, has a simple structure, and is relatively inexpensive.

[Means for Solving the Problem] A shaft holder for a rotary brush in an electric vacuum cleaner according to the present invention for solving the above problem holds the rotary brush driven by a drive source such as a motor via a belt. The holder comprises a leaf spring formed in a substantially U shape by the first to third plate portions, and the first plate portion arranged substantially parallel to each other of the leaf spring. The second plate portion and the second plate portion are provided with a non-circular hole into which the vicinity of the end portion of the non-circular shaft of the rotary brush is fitted so as not to rotate. A portion of the third plate portion, which is arranged substantially at a right angle to the plate portion and the second plate portion, is formed by half blanking so as to project into the substantially U-shaped inward portion and substantially parallel to the third plate portion. A protruding piece having a protrusion is provided, and is fixed to the housing between the protruding piece and the vicinity of the end portion of the shaft fitted in the hole. It is configured such that the defined protrusion is inserted.

[Operation] In the rotary brush shaft holder in the electric vacuum cleaner configured as described above, the rotary brush shaft can move in the protruding direction of the protruding piece against the elasticity of the protruding piece. It is possible to apply a predetermined tension to the belt that is hung on the driven pulley, and it is also possible to absorb the above-mentioned vibration that accompanies the rotation of the rotary brush.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of a holder, a rotary brush shaft, and a part of a housing of a suction port body. FIG. 2 is a state in which the holder and the rotary brush are assembled and attached to the housing. FIG. 3 is a vertical sectional side view showing the inside with a part of FIG. 2 removed.

In the figure, reference numeral 15 is a holder, which is a plate spring made of phosphor bronze, beryllium copper, or the like, which is processed into a substantially U shape by press molding. Non-circular holes 16 and 17 into which the non-circular portion 8 of the shaft 4 of the rotary brush described in the above-mentioned conventional example is fitted so as not to rotate on the plate surface near both ends of the substantially U-shaped plate spring. Has been drilled. Further, a projecting piece 18 projecting inward is provided on the central plate surface of the leaf spring by half blanking. Reference numeral 19 is a protrusion formed integrally with the lower side 20 of the housing of the suction port body.

In the state where the non-circular portion 8 of the shaft 4 is fitted into the holes 16 and 17 of the holder 15 formed as described above, the above-mentioned protrusion portion is provided between the protrusion piece 18 and the non-circular portion 8 of the shaft 4. Insert 19 (see Fig. 3). Then, as shown in FIG.
By attaching (fixing it to the lower side 20 of the housing by means not shown), the upper side 21 of the housing is attached to the upper part of the holder 15.
The protrusions 22 are arranged with a very small interval. In FIGS. 2 and 3, reference numeral 6 is a driven pulley integrally provided with the rotating brush, and 23 is a belt hung on the pulley.

When the holder 15 and the shaft 4 are attached to the projecting portion 19 as described above, the shaft 4 can move in the projecting direction of the projecting piece 18, that is, to the right in FIG. 3, against the elasticity of the projecting piece 18. As a result, the tension of the belt 23 can be maintained at a predetermined value, and the vibration of the rotary brush can be absorbed.

[Advantages of the Invention] As described above, the present invention is a holder for holding a shaft of a rotary brush in an electric vacuum cleaner, which holds the rotary brush driven by a belt from a drive source such as a motor. In the above-mentioned holder, the holder comprises a leaf spring formed in a substantially U shape by the first to third plate portions, and the first plate portion and the second plate portion of the leaf spring arranged substantially parallel to each other. The plate portion is provided with a non-circular hole into which the vicinity of the end portion of the non-circular shaft of the rotating brush is fitted so as not to rotate, and the first plate portion and the first plate portion of the leaf spring are provided. The third plate portion, which is arranged substantially at a right angle to the second plate portion, is provided with a protruding piece having a portion protruding inward of the substantially U-shape and having a portion substantially parallel to the third plate portion by half blanking. Provided between the protruding piece and the vicinity of the end of the shaft fitted in the hole, and fixed to the housing. The protrusion is inserted so that when the tension of the belt is excessive, the shaft can move in the protrusion direction of the protrusion against the elasticity of the protrusion. Since it is a shaft holder for a rotating brush in an electric vacuum cleaner, the shaft of the rotating brush can move in the projecting direction of the projecting piece against the elasticity of the projecting piece. It is possible to apply a predetermined tension to the belt hung on the driven pulley of the rotary brush without using any parts, and it is also possible to absorb the above-mentioned vibration accompanying the rotation of the rotary brush. Therefore, by using the rubber damper, it is possible to obtain a shaft holder for a rotating brush which is free from the possibility of elemental deformation and has a simple structure.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a side view, FIG. 3 is a vertical side view, and FIG. 4 is a conventional rotary brush. And FIG. 5 is an exploded perspective view showing a conventional holder. 1: rotating brush, 4: shaft, 6: driven pulley, 8: non-circular part, 15:
Holder, 16, 17: hole, 18: protruding piece, 19: protruding portion, 20: lower side of housing, 23: belt.

Claims (1)

[Claims] 1. A holder for holding a shaft of a rotating brush in an electric vacuum cleaner, which holds the rotating brush driven from a drive source such as a motor via a belt, the holder comprising: The first and second plate portions, which are substantially parallel to each other and are formed in a substantially U-shape by the first to third plate portions, are provided with the rotation. A non-circular hole that is fitted so as not to rotate is provided in the vicinity of the end of the shaft formed in a non-circular shape of the brush, and is substantially perpendicular to the first plate portion and the second plate portion of the leaf spring. A protrusion piece that protrudes toward the inside of the substantially U-shape and has a portion substantially parallel to the third plate portion is provided on the arranged third plate portion by half blanking, and the protrusion piece and the hole are provided. Between the end of the shaft fitted to the end of the shaft, a protrusion fixed to the housing is inserted. When the tension of the belt is excessive, the shaft can move in the protruding direction of the protruding piece against the elasticity of the protruding piece. Ingredient