JPS58113597A - Box type fan - Google Patents

Abstract

PURPOSE:To compact box construction for an electric fan and stabilize its performance by arranging four rollers in engagement with the periphery of the grill, in which two of those shall press the grill against the other two to hold the grill and in which one of them shall work as drive wheel to rotate the grill. CONSTITUTION:Around a grill 8 for changing the direction of wind, four rollers 31-34 are arranged in engagement with the periphery of the grill, in which two of the rollers, 31 and 32, press the grill 8 against the other rollers 33, 34 to hold the grill 8. Further one of them, 31, shall work as drive wheel to be driven as in a single piece by a grill driving motor 37, where the grill 8 is driven into rotation through frictional engagement of the roller 31 with the periphery of grill 8. Accordingly the box itself due to periheral drive can be compacted, and operation of the grill 8 can be stabilized compared with a conventional center-born construction likely to swing traversely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a box-shaped electric fan, and more particularly to a box-shaped electric fan equipped with a grill for changing the wind direction in order to blow air over a wide area.

Generally, in a box-shaped electric fan, a grill with a large number of wind direction control blades is installed inside the air outlet provided on the front of the box body, and by rotating this grill at a low speed, air is blown over a wide area. For this reason, a reduction gear is usually attached to the output shaft 1 of the main motor that supports the grille at the center and drives the rotor blades, or to the output shaft of an auxiliary motor separate from this main motor. A method has been adopted in which the grille is driven at its center using a reduction gear, but in order to drive the grille at the center as in this method, it is necessary to increase the reduction ratio, and therefore the reduction gear itself becomes large. Furthermore, especially when an auxiliary motor is used, this reduction gear, including the auxiliary motor, needs to be placed roughly on a line connecting the centers of the rotor and the grille, so the dimensions, especially in the depth direction, become large. This resulted in an increase in the size of the box, which was extremely inconvenient for this type of box-shaped electric fan, which is designed to be compact.

As a way to avoid the disadvantages of conventional methods,
It has been proposed that a low-output auxiliary motor is attached to the corner of the box body, and a roller on the output shaft of this auxiliary motor is pressed against the outer periphery of the centrally supported grille to rotate the grille. In this method, the reduction ratio can be reduced by the ratio of the diameter of the roller and the loincloth of the grill, and therefore the reduction gear can be made smaller and the box body itself can be made more compact. The load caused by the grille is borne only by the support shaft of the grille, and the support of the grille becomes unstable and often rotates while shaking sideways.

On the other hand, in view of the above points, the present invention aims to provide a box-shaped electric fan that is compact and allows the grill to run in a stable state. Each air intake port is provided on the rear surface, a motor and a rotary blade driven by the motor are installed in the box body, and a grill equipped with a large number of wind direction control blades is installed at the air outlet, In a box-shaped electric fan configured to rotate this grill to blow air over a wide area, eight or more rotating wheels that engage with the outer periphery of the grill are arranged around the grill, and at least one of the rotating wheels is connected to the grill. is elastically biased toward the center to press it against other rotating wheels, and
One of the rotating wheels is a driving wheel that drives the grille.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, the box body 1 has a structure in which a front case 2 and a rear case 8 are combined, and a circular air outlet 4 formed in the front case 2 is provided on the front side. Further, a circular air intake port 5 formed in the rear case 3 is provided on the rear surface, and a handle 6 for carrying is provided on the top surface, and a handle 6 for carrying the box 1 is provided at the bottom of the box 1 to support the box 1. A pair of legs 7 are attached. A grill 8, which will be described in detail later, is attached to the air outlet 4, while a protective cover 10 having a plurality of guards 9 arranged at predetermined intervals on the outer periphery and end face is attached to the air intake port 5. has been done. A circular bracket 14 supported by two main stays 11, 12 and four auxiliary stays 13 is provided at the center of the front case 2 on the side opposite to the air outlet 4. A main motor 15 is attached to the bracket 14 with a motor frame 16 secured to a boss 17 of the bracket 14 with screws 18. This main motor 1
A hub 21 having a plurality of rotary blades 20 protruding from the outer periphery is fixed to the output shaft 19 of No. 5 in the axial direction by a nut 22 and in the rotational direction by a pin 23 press-fitted into the output shaft 19. installed.

The grille 8 attached to the air outlet 4 described above is composed of a hollow circular wind direction control section 24 and a circular decorative plate 26 that is integrally fitted into the hollow section 25 of this wind direction control section 24. , the wind direction control section 24 has an outer ring 27, and between the outer rings 27 there is an inclination angle of at most 306 with respect to the axial direction, as shown in FIG.
A large number of wind direction control vanes 28 whose inclination angles are successively reduced are arranged in parallel at predetermined intervals, and each wind direction control vane 2
8 is a pair of ribs 29.29 perpendicular to this wind direction control blade 28.
connected by.

There are also four rollers 81828B and 84 around the grill 8.
are arranged, and each of the rollers 31 to 34 has a groove 85 that engages with the tip 27a of the outer ring 27 of the grille 8.
is provided around the circumference of the groove 85, and a rubber ring 36 having a large friction coefficient, for example, is fitted into the groove 85. First, the second
Explaining the roller 81 disposed diagonally to the upper right of the grill 8 in the figure, this roller 81 is connected to the output of the grill drive motor 37, which has a lower utility power than the main motor 15 for driving the rotary blades 20, as shown in FIG. It is properly attached to the shaft 88 by a bushing nut 89, and rotates together with the output shaft 38. The drive motor 87 houses a speed reduction device therein, and the output shaft 38 is configured to protrude forward from a position offset from the center of the motor 87.

Further, as shown in detail in FIG. 4, this drive motor 87 is
The protrusion 40.40 of the motor frame is attached to the motor bracket 42 by screws 41.41. By fixing the screw 45 at the center, the inner wall 4
It is rotatably supported on legs 46, 47 formed on 3. The bracket 42 is rotated in the direction of the arrow, that is, toward the center of the grille 8, by a spring 48 that is wound around the boss 44 and has one end fixed to the leg 46 and the other end fixed to the bracket 42. Forced. On the other hand, the front case 2
A notch 50 is formed in the cylindrical portion 49 constituting the air guide hole, and the rotationally biased roller 31 is inserted into the notch 50.
Looking inward from 0, the tip 27 of the outer ring 27 of the grill 8
It is configured to be able to engage with &. The four parts 51 provided on the upper surface of the legs 47 are for restricting the rotation range of the bracket 42 when the grille 8 is attached or detached.

Next, the roller 32 located diagonally to the upper left of the grill 8 is the eighth roller.
As shown in the figure, it is rotatably supported on a roller bracket 52 about a shaft 58, and like the bracket 42 described above, this bracket 52 is properly attached to a boss 54 with a stepped screw 55. It is rotatable on the legs 56 and 57 about the screw 55 (see FIG. 2), and is rotated by the arrow B by a spring 58 which is wound around the boss 54 and is locked at one end to the leg 56 and the other end to the bracket 52. In other words, it is also biased to rotate toward the center of the grille 8. Therefore, this roller 32 is also similar to the roller 31 in the front case 2.
The rubber ring 36 in the groove 35 is configured to engage with the outer ring 27 of the grille 8. Note that four parts 59 are provided on the upper surface of the leg 57 to restrict the rotation range of the bracket 52.

Further, the rollers 33 and 34 disposed below the grille 8 have the same construction, and the roller brackets 60 and 34 respectively have the same structure.
Each bracket 60.61 is supported on the inner wall 48 so as to be rotatable about a shaft 62.63, and each bracket 60.61 is mounted on the upper surface of a pair of legs 62.62 or 63.68 formed on the inner wall 48 (not shown). A portion of the roller 38.34 is fitted into the four parts having the same width dimensions as the platen (platen) 60, 61, and is also connected to a boss 64.65 on the inner wall 43 by a screw 66.67, so that a part of the roller 38.34 is connected to the cylindrical part. It is fixed in a position facing inward of 49.

That is, the grille 8 attached to the air outlet 4 has its outer ring 27 fitted into the grooves 35 of the four rollers 31 to 34, and the rollers 31 and 32 connect the grille 8 to the other rollers 8.
B, 84 is supported so as to be pressed.

The present invention has the above-mentioned configuration, and its operation will be explained next. The liquid is discharged from the outlet 4 where a switch (not shown) is turned on. On the other hand, when the above-mentioned switch is turned on in conjunction with 1 or when a separate switch is turned on, the grill drive unit 87
is started, and the roller 31 integrated with the output shaft 88 of the motor 37 is driven, so that the grille 8 is four rollers 3 including roller 31
It is rotationally driven while being supported by 1 to 34. At this time, the roller 81 has already been decelerated by the drive motor 37, which is a deceleration motor, and is further engaged with the outer periphery of the grille 8, so the grille 8 rotates at an extremely low speed. For this reason,
The air sent from the rotary blade 20 to the air outlet 4 is at most 8
The air is discharged by being bent at an angle corresponding to the inclination angle of each control vane 28 as it hits a large number of wind direction control vanes 28 whose inclination angle is gradually decreased from 0°, and since the grille 8 is rotating, the air outlet Air can be blown over a wide area in front of 4.

As is clear from the above description, in the present invention, four rollers are arranged around the grill for changing the wind direction and engage with the outer periphery of the grill, and two of these rollers move the grill to the other two rollers. The grille is supported by being pressed against the grille, and one of the rollers is used as a drive wheel, and the grille is rotationally driven by frictional engagement between this roller and the outer circumference of the grille. It takes full advantage of the fact that the body itself can be made compact, and the grille can also be run in a more stable state compared to a center-supported grille that is more likely to sway.

Although the number of rollers applied is four, it is not limited to this number as long as there are three or more, and the number of lips that apply biasing force can also be two.
The number is not limited to 1 or more.

Furthermore, the drive of the grill is not based on the frictional engagement between the roller and the outer circumference of the grill; for example, a gear is provided on the outer circumference of the grill, while a pinion is attached to the output shaft of the grill drive motor.
The grille may be driven by the meshing of the engine and the gear.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a schematic vertical sectional view, FIG. 2 is a partially cutaway front view, and FIGS. 8 and 4 are They are a front view and a perspective view showing important parts, respectively.

Claims (1)

[Scope of Claims] 1. An air outlet is provided on the front surface of the box body, and an air intake port is provided on the rear surface of the box body, and a motor and a rotary blade driven by the motor are installed in the box body, and a large number of wind direction control blades are installed in the box body. A box-shaped electric fan is provided with a grill provided in the air outlet, and the grill is rotated to blow air over a wide area, and eight or more rotating wheels are provided around the grill and engage with the outer periphery of the grill. arranged, at least one of the rotating wheels is elastically biased toward the center to press the grille against another rotating wheel, and one of the rotating wheels is a driving wheel that drives one grille. 2. A box-shaped electric fan 3 according to claim 1, characterized in that the drive wheel of the grill is configured to frictionally engage with the outer periphery of the grill. A gear is provided on the outer periphery of the grill. The box-shaped electric fan according to claim 1, wherein the drive wheel is a pinion, and the pinion meshes with the gear.