JPS62298696A - Fan - Google Patents

Abstract

PURPOSE:To reduce the cost of production, by supporting a wind direction changing plate with a support shaft having an external three in front of a body so as to be rotatable by wind pressure, while interposing a coil spring between the wind direction changing plate and the body with the support shaft as the center, and having a cap screw screwed in the support shaft. CONSTITUTION:A wind direction changing plate 4, having a support shaft 5 whose tip comes to an external thread, and being rotated by dint of wind pressure of a fan 3, is rotatively supported in front of a body 1. A coil spring 6 is interposed between the body 1 and the wind direction changing plate 4, and a cap screw 7 pressing down the plate 4 is attached to the external thread at a tip of the support shaft 5. Therefore, braking force to rotation of the wind direction changing plate 4 is regulated by regulation of clamping of the cap screw 7 and thereby a speed of rotation is selectable. Accordingly, no motor is required for this mechanism so that manufacturing cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an electric fan having a wind direction changing plate which is rotated by the wind pressure of the fan.

BACKGROUND ART Conventionally, as shown in FIG. 3, this type of single-air fan has a wind direction changing plate 102 rotatably provided on the front surface of a case 101.
A drive motor 103 is arranged on the outer periphery of the drive motor 103, a connecting pulley 105 is connected to the drive motor 103, and a switch 104 is connected to the drive motor 103.
This operation drives the drive motor 103 and rotates the wind direction changing plate 102 via the coupling pulley 106.

Note that 106 in the figure indicates a drive motor mounting plate.

Problems to be Solved by the Invention In such a conventional configuration, the switch 104 of the drive motor 103 and the mounting plate 106 are required, as well as the installation and wiring of each component. In order to change the rotational speed of the wind direction changing plate, a control device for the drive motor 103 is required, resulting in an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and an object of the present invention is to provide an electric fan that can rotate and adjust the rotational speed of a wind direction changing plate without using a drive motor, and that can reduce manufacturing costs.

Means for Solving the Problem In order to solve this problem, the present invention provides a support shaft having a male thread on the front surface of the casing-like main body, and allows the wind direction changing plate to be rotated by wind pressure with this support shaft. A coil spring is interposed between the wind direction changing plate and the main body around the support shaft, and a presser screw is screwed onto the support shaft.

Operation With this configuration, the rotation of the wind direction changing plate is braked by the spring pressure and the frictional force between the coil spring and the wind direction changing plate.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 indicates fan motor 2 and fan motor 2.
It is a housing-like main body that houses a fan 3 that rotates by a screwdriver, and has a support shaft 6 having a male threaded tip on its front surface. The support shaft 6 rotatably supports the wind direction changing plate 4 which is rotated by the wind pressure of the fan 3. Between the main body 1 and the wind direction changing plate 4, there is a coil portion centered around the support shaft 6 and having a diameter that changes the wind direction. A conical coil spring 6 is interposed on the plate 4 side. A holding screw 7 for holding down the wind direction changing plate 4 is attached to the male thread at the tip of the support shaft 6.

In the above configuration, as the holding screw 7 is tightened, the conical coil spring 6 is held down, the spring pressure increases, and the conical coil spring 60 in contact with the wind direction changing plate 4 is pressed down.
As the number of windings increases, the frictional force between the conical coil spring 6 and the wind direction changing plate 4 increases, making it possible to slow down the rotation of the wind direction changing plate 4. By adjusting the tightening of the holding screw 7, the wind direction changing plate The braking force for the rotation of the wind direction changing plate 4 is adjusted.
You can choose the speed of rotation. In addition, although the spring is a conical spring in the embodiment, it may be a normal coil spring.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, by adjusting the pressure of the wind direction changing plate with a coil spring, the spring pressure changes and the coil spring in contact with the wind direction changing plate changes. The frictional force between the wind direction changing plate and the wind direction changing plate changes, and therefore the rotation of the wind direction changing plate can be braked. Further, since the mechanism does not require a motor or the like, manufacturing costs can be reduced, which is highly effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electric fan according to an embodiment of the present invention, FIG. 2 is an external perspective view of the same, and FIG. 3 is an external perspective view of a conventional electric fan. 1...Body, 2...Fan motor, 3
...Fan, 4...Wind direction change plate, 6.
...support shaft, 6...conical coil spring,
7...Press screw. Name of agent: Patent attorney Toshio Nakao and 1 other person I11 I25;

Claims (2)

[Claims] (1) A support shaft with a male thread is provided on the front of the casing-like main body containing a fan motor and a built-in fan, and the support shaft supports the wind direction changing plate so that it can be rotated by wind pressure, and the air direction changing plate is connected to the main body. A coil spring is interposed around the support shaft, and a presser screw is screwed onto the support shaft. (2) The electric fan according to claim 1, wherein the coil spring is a conical coil spring, and the small diameter coil portion is arranged on the wind direction changing plate side.