JP2014211116A - Swing mechanism of electric fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and versatile swing mechanism in a compact electric fan.SOLUTION: A swing mechanism of an electric fan includes an electric fan body A performing swing operation, a pedestal part C composed of a bottom plate 41 and a base part 25 rotatably arranged on an upper part of the bottom plate 41, a swing driving unit B arranged between the electric fan body A and the pedestal part C, and a swing driving motor 13 provided within the swing driving unit B. The swing driving unit B includes a cam body 21 driven in cooperation with rotation of a motor 13, an oscillation rack body 20 oscillated in cooperation with drive of the cam body, and a ratchet gear 40 held on the bottom plate 41 of the pedestal part C. A rack 20a is engaged with the ratchet gear 40.

Description

  The present invention relates to a swing mechanism of a type in which a fan is provided with a motor dedicated to swinging.

  As the swing mechanism of the electric fan, the one using a link mechanism often used in household electric fans, the one using the precession used in the ceiling suspension electric fan of a train, the servo motor for swinging A device that reciprocates by changing the rotation direction of the motor is known. In addition, a louver (front cover) that rotates and changes the wind direction without using a swing mechanism is also used.

  Furthermore, as a typical three-dimensional head swing mechanism, there are ones that use two servo motors or two link mechanisms to combine the X-axis and Y-axis swinging motions.

Japanese Patent Publication No.33-5337 Japanese Utility Model Publication No. 40-1069 Japanese Utility Model Publication No. 2-34787 Japanese Patent Laid-Open No. 5-288189 JP-A-8-121380 Japanese Patent No. 2542923 Utility Model Registration No. 3072748 JP 2001-342990 A JP 2004-324640 A

  As the swing mechanism of the electric fan described above, the arm becomes shorter when the link mechanism is downsized, so the difference in speed between the right and left rotations of the swing reciprocating motion becomes large, and it is difficult to increase the swing angle. Has the following disadvantages.

  What swings using a servo motor has the advantage that the structure is simple and there is no difference between left and right reciprocating motion and the degree of freedom of swinging angle is large, but it is disadvantageous in that it is expensive.

  If the three-dimensional swing mechanism uses two motors, it is difficult to synchronize the two motors. For this reason, the direction of the two motors is randomly changed by providing a rotation difference. There is a disadvantage that the period of change is not constant and the cost is high because two motors are used.

  In addition, the three-dimensional swing mechanism that uses two link mechanisms needs to match the phases of the X-axis and Y-axis at the time of assembly, and it is difficult to reduce the size of the mechanism. Is inconvenient.

  Accordingly, an object of the present invention is to provide a small and versatile swing mechanism in a small electric fan.

The invention described in the first claim of the present application is described with the reference numerals used in the embodiments, and the electric fan main body A that performs the swinging operation, the base plate 41, and a base that is rotatably provided on the upper part of the base plate 41. And a swing drive unit B provided between the electric fan main body A and the base C, and the swing drive unit B is used for swing drive. In the swing mechanism of the electric fan provided with the motor 13,
The swing drive unit B is held by the electric fan main body A and provided with left and right unit cases 15 and 22 fixed to the base portion 25 of the pedestal portion C. The unit cases 15 and 22 are arranged between the unit cases 15 and 22. A cam body 21 that is linked to the rotation of the motor 13, a rocking rack body 20 that swings in conjunction with the cam body and is provided with a rack 20 a at the rocking end, and a bottom plate 41 of the pedestal C. And a ratchet gear 40 to be held, and a swing mechanism of the electric fan configured by meshing the rack 20a of the swing rack body 20 and the ratchet gear 40.

The invention described in claim 2 of the present application is a type in which a swing drive unit B is provided between the electric fan main body A and the pedestal portion C, and the swing drive motor 13 is provided in the swing drive unit. In the swing mechanism of the electric fan,
The electric fan main body A includes one and the other case portions (the middle case 3 and the rear case 6) that cover the swing drive unit B, and the other case portion (the rear case 6) has the above-mentioned swing drive unit. A holding part 63 of the swing driving unit B that holds the upper end part of the unit B is provided, and the holding part 63 and the upper end part of the swing driving unit B are connected to the case part and the swing driving unit B. The fulcrum part of relative rotation in
The swing drive unit B includes a cam body 21 that is drivingly linked to the motor, and a unit case 22 that rotatably supports the cam body, and a lower portion of the swing drive unit B is a pedestal portion. Fixed to C,
The cam body 21 is positioned in the vertical direction, and an eight-shaped cam groove 21a is formed in the vertical surface portion of the cam body on the unit case side.
The unit case 22 is provided with a long hole 22b facing the eight-shaped cam groove 21a,
Further, the one case portion (the middle case 3) at the position facing the elongated hole 22b of the unit case 22 has its tip inserted through the elongated hole 22b and engaged with the eight-shaped cam groove 21a. This is a swing mechanism of the electric fan configured to be provided with front and rear drive control pins 24.

The invention described in claim 3 of the present application is a pedestal portion C composed of a fan main body A that performs a swinging motion, a bottom plate 41 and a base portion 25 that is rotatably provided on the upper portion of the bottom plate 41, and In the swing mechanism of the electric fan comprising the swing drive unit B provided between the electric fan main body A and the pedestal C, and having the swing drive motor 13 in the swing drive unit B,
The swing drive unit B is held by the electric fan main body A and provided with left and right unit cases 15 and 22 fixed to the base portion 25 of the pedestal portion C. The unit cases 15 and 22 are arranged between the unit cases 15 and 22. A cam body 21 that is drivingly linked to the rotation of the motor 13, a swinging rack body 20 that is driven and linked to the cam body 21 and is provided with a rack 20 a at its swinging end, and a bottom plate 41 of the pedestal portion C And the ratchet gear 40 is configured to mesh with the rack 20a of the rocking rack body 20 and the ratchet gear 40.
The electric fan main body A includes one and the other case portions (the middle case 3 and the rear case 6) that cover the swing driving unit B, and the other case portion (the rear case 6) has the above-mentioned swinging. A holding part 63 of the swing driving unit B that holds the upper end part of the driving unit B is provided, and the holding part 63 and the upper end part of the swing driving unit B are connected to the case part (the middle case 3, The rear case 6) and the swing drive unit B constitute a pivot point for relative rotation,
The cam body 21 is positioned in the vertical direction, and an eight-shaped cam groove 21a is formed in the vertical surface portion of the cam body on the unit case side.
The unit case 22 is provided with a long hole 22b facing the eight-shaped cam groove,
Further, the one case portion (the middle case 3) at the position facing the elongated hole 22b of the unit case 22 has its tip inserted through the elongated hole 22b and engaged with the eight-shaped cam groove 21a. This is a swing mechanism of the electric fan configured to be provided with front and rear drive control pins 24.

  According to the fourth aspect of the present invention, in the first or third aspect, the ratchet gear 40 includes ratchet claws 40b and 40b, and the pedestal portion C holds the ratchet gear 40 on the portion that holds the ratchet gear 40. This is a swing mechanism of a fan that has tooth portions 41b and 41b that engage with the ratchet claws 40b and 40b to form a ratchet structure.

  According to the first aspect of the present invention, the swing rack body 20 swings with the rotation of the motor 13, and the rack 20a of the swing rack body and the ratchet gear 40 meshing with the rack 20a. By relative driving, the rocking rack body 20 meshes around the ratchet gear 40 and reciprocally rotates, whereby the swing driving unit B is driven to rotate, and the electric fan main body A swings in the horizontal direction. It is possible to obtain a swing mechanism for a driving fan.

  According to the second aspect of the present invention, the cam body 21 rotates with the rotation of the motor 13, and the cam body rotates eccentrically to engage with the eight-shaped cam groove 21a. The drive control pin 24 is driven back and forth, and the front and rear drive control pin is driven back and forth to swing the swing drive unit B in the front and rear direction via the case portion 3, thereby swinging the drive unit B Can be obtained. A fan swinging mechanism in which the fan main body A holding the fan swings in the front-rear direction can be obtained.

  According to the third aspect of the present invention, the swing rack body 20 swings with the rotation of the motor 13, and the ratchet gear 40 meshed with the rack 20a of the swing rack body 20 and , The rocking rack body 20 meshes around the ratchet gear 40 and reciprocates, thereby causing the swing drive unit B to swing in the horizontal direction. By the eccentric rotation, the front / rear drive control pin 24 engaged with the eight-shaped cam groove 21a is driven forward / backward, and the front / rear drive control pin 24 drives the front / rear through the case portion (middle case 3). Since the swing drive unit B swings in the front-rear direction, the horizontal swing drive and the front-rear swing drive are combined to make the electric fan main body A horizontal and front-rear. Oscillating mechanism of fan driving can be obtained.

  According to the fourth aspect of the present invention, there is provided a ratchet structure that disengages the ratchet claws 40b, 40b and the tooth portions 41b, 41b when an external force is applied to the swing drive unit B. The swing mechanism of the fan can be obtained.

1 is an exploded perspective view showing a swing mechanism of a fan according to an embodiment of the present invention. FIG. 6 is an exploded perspective view showing a swing unit portion according to the embodiment of the present invention. FIG. 6 is an exploded perspective view showing a swing unit portion according to the embodiment of the present invention. FIG. 5 is an assembled perspective view showing a swing unit portion according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows the principal part of the swing mechanism of an electric fan concerning the Example of this invention, Comprising: (a) is a figure from a side surface direction, (b) is a perspective view from a front upper right direction, (c) is It is a perspective view from the back upper direction. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a fan head swing mechanism according to an embodiment of the present invention, in which (a) is a view from the side, (b) is a view from the front, and (c) is front and rear. The figure from the side direction in the state which carried out direction driving, (d) is a figure from the upper part.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, the swing mechanism of the electric fan of this example includes a fan main body A that performs a swing motion, a swing drive unit B, and a pedestal C.

  The electric fan main body A constitutes a blower section. In FIG. 1, the front case 1, the downstream impeller 2, the middle case 3, the downstream motor 4, the upstream motor 5, the rear case 6, the upstream impeller 7, A grill cover 8 and switch circuit portions 9, 10, 11, 12 are formed.

  Further, as shown in FIG. 2, the middle case 3 is formed below the columnar portion 31 that hangs down from the motor covering portion, the horizontal plate-shaped portion 32 that covers the holding portion 63 of the rear case 6, and the horizontal plate-shaped portion 32. The switch placement portion 33 and a projecting piece 34 projecting from the one side surface of the switch placement portion 33 toward the rear case 6 are provided.

  The protruding piece 34 is formed at a location corresponding to the elongated hole 22 b of the right unit case 22, and includes a hole 34 a for inserting the front / rear swing control pin 24.

  The rear case 6 includes a columnar portion 61 that hangs down from the motor covering portion, a placement portion 62 of the swing driving unit B, and a holding portion 63 of the swing driving unit B that is formed at the lower end of the columnar portion 61. Is provided. The holding portion 63 holds the upper bearing portion (upper shaft 20c) of the swing drive unit B described later.

  The switch circuit units 9, 10, 11, and 12 are installed in the switch placement unit 33 of the middle case 3. In addition, 10 is a circuit board, 11 is a push switch, 12 is a slide switch, and both of these push switch 11 and slide switch 12 can be operated with the button 9.

  As shown in FIGS. 1 to 4, the swing drive unit B is formed of a motor 13 having a worm gear 13 a fixed to a motor shaft, followed by a bush 14, a left unit case 15, and gears 16, 17, 18, 19. A reduction gear train, a swing rack body 20, a cam body 21 that is rotationally driven by the gear 19, and a right unit case 22.

  The left unit case 15 fixes the motor 13, and includes a bearing portion 15a at the upper portion, a support shaft 15b for the gear 19 of the reduction gear train, and a fixing portion 15c with the right unit case 22, and a lower end of a pedestal portion C to be described later. It is placed on the pedestal 25. The bearing portion 15 a supports one end of the upper shaft 20 c of the swing rack body 20.

  The reduction gear train includes a gear 16 that meshes with the worm gear 13a and the large-diameter gear 16a, a gear 17 that meshes with the small-diameter gear 16b of the gear 16, and a small-diameter gear 17b that meshes with the large-diameter gear 17a. The meshing gear 18 and the small-diameter gear 18b of the gear 18 are constituted by a gear 19 that meshes with the large-diameter gear 19a.

  The small-diameter gear 19b of the gear 19 meshes with the gear receiving portion 21c of the cam body 21 described later. The small-diameter gear 19b has a cylindrical portion at the center, and this cylindrical portion is fitted to a protruding shaft 21b formed at the center of the gear receiving portion 21c. Accordingly, the small diameter gear 19b and the gear receiving portion 21c are configured to be reliably engaged with each other.

  The rocking rack body 20 includes a rocking upper shaft 20c at the upper part, a rack 20a at the lower part, and a cam engagement hole 20b in which the cam edge of the cam body 21 is fitted and engaged at the intermediate part.

  The rack 20a has a curved shape. This curved shape corresponds to an arc having a radius between the upper shaft 20c and the rack 20a.

  The outer peripheral edge of the cam body 21 constitutes a cam edge portion that is eccentric with respect to the cam body rotation center. The gear receiving portion 21c is on the reduction gear train side, and the eight-shaped cam is on the back surface (right unit case 22 side). At the center of the groove 21a and the gear receiving portion 21c, projecting shafts 21b projecting from the front and back sides are formed.

  The right unit case 22 has a shaft portion 22a at the top, a long hole 22b facing the octagonal cam groove 21a on the back surface of the cam body 21, an adhering portion 22c with the left unit case 15, and a portion protruding in the direction of the left unit case 15. A shaft portion 22d formed at the tip portion is provided. A small-diameter gear 16b of the gear 16 is attached to the shaft portion 22d. A bush 23 is attached to the shaft portion 22a. A fixing portion 15c (in this example, a shaft) of the left unit case 15 is fixed to the fixing portion 22c. The fixing portion 22c is a hole in this example, and a screw (not shown) is inserted into the hole to fix the fixing portion 15c of the left unit case 15. In addition, as shown in FIG. 4, 22e is a hole, The protrusion shaft 21b of the cam body 21 is rotatably supported by this hole 22e. Further, the lower end of the right unit case 22 is placed on the pedestal 25 of the pedestal C.

  In the right unit case 22, the shaft portion 22 a engages with an upper portion (a portion corresponding to the shaft 20 c) of the swing rack body 20 to support the swing rack body 20. Further, the right unit case 22 holds the upper part of the swing rack body 20 together with the left unit case 15 (see FIG. 4). The upper part of the swing drive unit B thus assembled (the upper part of the left unit case 15, the upper part of the swing rack body 20, and the upper part of the right unit case 22) holds the rear case 6 as described above. Held in the part 63.

  The upper portion of the swing drive unit B is held by the holding portion 63 of the rear case 6 and further covered by the horizontal plate-like portion 32 of the middle case 3. In this way, the swing drive unit B swings relative to the electric fan body A with the upper part as a fulcrum. In this example, the swing drive unit B is fixed to the base portion 25 of the pedestal portion C, so that the electric fan body A swings relative to the swing drive unit B.

  The swing of the electric fan main body A with respect to the swing drive unit B is prevented from being fixed to each other by members not shown when the electric fan main body A rotates horizontally, but it rotates in the front-rear direction. At that time, the rocking is performed.

  The long hole 22b of the right unit case 22 functions when the electric fan main body A swings in the front-rear direction, and is provided so as to face an eight-shaped cam groove 21a when the cam body is rotated, which will be described later. The elongated hole 22b is slightly curved so that when the longitudinal swing control pin 24 is inserted into the elongated hole 22b, the electric fan body A can swing in the longitudinal direction. The swinging of the electric fan main body A in the front-rear direction with respect to the swing drive unit B will be described in detail later.

  The pedestal C is composed of a bottom plate 41 with the ratchet gear 40 mounted on the cylindrical portion 41a, and a pedestal 25 provided on the top of the bottom plate 41 to be rotatable. The ratchet gear 40 includes ratchet claws 40b and 40b. Further, in the pedestal portion C, teeth 41b and 41b that engage with the ratchet claws 40b and 40b are provided at a portion that holds the ratchet gear 40. When the ratchet claw 40b, 40b and the tooth portions 41b, 41b are provided with a ratchet structure, when an external force exceeding a certain level is applied to the swing unit B, the ratchet claws 40b, 40b and the tooth portions 41b, 41b Are provided so as to be disengaged. In FIG. 1, reference numerals 26, 27, 28 and 29 denote bushes.

  Next, horizontal driving (horizontal driving) of the swing unit B in this example will be described.

  The swing mechanism of the electric fan of this example is a type in which a swing drive unit B is provided between the fan main body A and the pedestal C, and the swing drive motor 13 is provided in the swing unit. As described above, the swing drive unit B includes the reduction gear trains 16, 17, 18, and 19 that transmit the rotation of the motor, the cam body 21 that is drivingly linked to the reduction gear train, and the cam body. A swing rack body 20 that swings in conjunction with the rack 20a at the swing end thereof, and a ratchet gear 40 that is held by the pedestal C, and further includes a rack of the swing rack body 20 20a and the ratchet gear 40 are meshed.

  In the above swing mechanism, the swing rack body 20 is swung by the rotation of the reduction gear trains 16, 17, 18, 19 and the cam body 21 by the rotation of the motor 13, and the rack 20a of the swing rack body and this The ratchet gear 40 meshes with the tooth portion 40a of the ratchet gear 40, so that the swing rack body meshes around the ratchet gear and reciprocates, thereby causing the swing drive unit B to move horizontally. Swing drive.

  More specifically, the worm gear fixed to the motor rotating shaft meshes with the large diameter gear 16a of the gear 16, the small diameter gear 16b of the gear 16 meshes with the large diameter gear 17a of the gear 17, and the small diameter gear 17b of the gear 17. Is engaged with the large diameter gear 18a of the gear 18, the small diameter gear 18b of the gear 18 is engaged with the large diameter gear 19a of the gear 19, and the small diameter gear 19b of the gear 19 is engaged with the gear receiving portion 21c of the cam body 21. . Therefore, when the motor 13 rotates, the cam body 21 rotates eccentrically via the reduction gear trains 16, 17, 18, and 19.

  Since the cam body 21 is engaged with an inner side of an engagement hole 20b provided in an intermediate portion of the rocking rack body 20, the rocking rack body 20 is moved upward by the eccentric rotation of the cam body 21. It swings with (upper shaft 20c) as a fulcrum.

  When the swing rack body 20 swings, the rack 20a at the lower end of the swing rack body is driven. Since the rack 20a meshes with the ratchet gear 40, the rack 20a is driven to rotate the ratchet gear 40. However, the ratchet gear 40 is subjected to a rotational load by the ratchet pawl 40b. The body 20 relatively meshes and rotates around the ratchet gear 40. As the swing rack body 20 swings, the meshing rotation of the swing rack body 20 with respect to the ratchet gear 40 reciprocates. As a result, the swing rack body 20 rotates, so that the swing drive unit B also rotates and the swing drive unit B is periodically reciprocated horizontally.

  As described above, the ratchet gear 40 includes the ratchet claws 40b and 40b and has a ratchet structure. Therefore, when an external force exceeding a certain level is applied to the swing unit B, the ratchet claws 40b and 40b It is provided so that the engagement with the tooth portions 41b, 41b is released. Therefore, it is convenient because the ratchet structure can be used when the swing operation position of the swing unit B is appropriately changed.

  Next, the swing drive (vertical drive) in the front-rear direction of the swing drive unit B in this example will be described.

  In the swing mechanism of a fan provided with a swing drive unit B between the fan main body A and the pedestal C and having a swing drive motor 13 in the swing unit, as described above, the fan main body A includes one and the other case portions (in this example, the middle case 3 and the rear case 6) that cover the swing drive unit B, and the other case portion (the rear case 6 in this example) A holding portion 63 of the swing driving unit B that holds the upper end portion of the swing unit is provided, and the holding portion 63 and the upper bearing portion (upper shaft 20c) of the swing drive unit B are connected to the case portion ( The middle case 3, the rear case 6) and the swing drive unit B constitute fulcrum portions for relative rotation.

  The swing drive unit B includes a cam body 21 and a right unit case 22 that rotatably supports the cam body. The cam body 21 is positioned in the vertical direction, and the cam body 21 An eight-shaped cam groove 21a is formed in a vertical surface portion of the body on the right unit case 22 side, and a long hole 22b facing the eight-shaped cam groove is provided in the unit case 22, The front / rear drive control pin whose front end is inserted into the elongated hole 22b and engages with the eight-shaped cam groove 21a of the one case portion 3 at a position facing the elongated hole 22b of the unit case 22. 24 is provided.

  Since such a configuration is provided, the reduction gear trains 16, 17, 18, 19 and the cam body 21 are rotated by the rotation of the motor 13, and the cam body is eccentrically rotated, so that the eighth cam groove 21a is rotated. The front / rear drive control pin 24 that engages with is regulated by the elongated hole 22b and is driven back and forth. By the front-rear drive of the front-rear drive control pin, the electric fan main body A swings in the front-rear direction with respect to the swing drive unit B via the case portion (in this example, the middle case 3) (FIG. 6). reference).

  In this example, a protruding piece 34 is formed integrally with the one case portion (middle case 3), and the front and rear drive control pins 24 are provided on the protruding piece 34. Therefore, in this example, the electric fan main body A is swung (vertically driven) in the front-rear direction via the protruding piece 34 of the middle case 3.

  Further, the swing mechanism of this example is provided with the horizontal swing drive and the front-rear swing drive. Therefore, if these are combined and driven, a horizontal eight-shaped operation (left and right) is performed. In the direction and up and down direction), and this uniting operation can be controlled by the single cam body 21 described above.

  The swing mechanism of the electric fan of the present invention is suitable for a small electric fan that is driven using, for example, a USB of a personal computer as a power source.

A Fan body B Swing drive unit C Pedestal part 1 Front case 2 Downstream impeller 3 Middle case 31 Columnar part 32 Horizontal plate part 33 Switch placement part 34 Projection piece 34a Hole 4 Downstream motor 5 Upstream motor 6 Rear case 61 Columnar part 62 Mounting part 63 Holding part 7 Upstream impeller 8 Grill cover 9, 10, 11, 12 Switch circuit part 13 Motor 13a Worm gear 15 Left unit case 16, 17, 18, 19 Gear 20 Swing rack body 20a Rack 20b Cam engagement hole 20c Upper shaft 21 Cam body 21a Eight-shaped cam groove 21b Projection shaft 21c Gear receiving portion 22 Right unit case 22a Shaft portion 22b Long hole 22c Adhering portion 22d Shaft portion 22e Hole 24 Front / rear drive control pin 25 Base portion 26, 27, 28, 29 Bush 40 Ratchet gear 40a Tooth portion 40b Ratchet claw 41 Bottom plate 41 Cylindrical portion 41b teeth

Claims (4)

A pedestal portion composed of a fan main body that performs a swing motion, a bottom plate and a base portion rotatably provided on the bottom plate, and a swing drive unit provided between the fan main body and the pedestal portion In the swing mechanism of a fan provided with a motor for swing drive in the swing drive unit,
The swing drive unit is held by the electric fan main body and provided with left and right unit cases fixed to the base portion of the pedestal portion, and is driven by rotation of the motor between the left and right unit cases. A cam body linked to the cam body, a rocking rack body that swings in conjunction with the cam body and has a rack at a rocking end thereof, and a ratchet gear that is held by the bottom plate of the pedestal portion. In addition, the swing mechanism of the fan is characterized in that the rack of the swing rack body and the ratchet gear are engaged with each other. In the swing mechanism of the fan of the type in which a swing drive unit is provided between the electric fan main body and the pedestal portion, and a motor for swing drive is provided in the swing drive unit,
The electric fan main body includes one and other case portions that cover the swing drive unit, and the other case portion includes a swing drive unit holding portion that holds an upper end portion of the swing drive unit, The holding portion and the upper end portion of the swing unit constitute a fulcrum portion of relative rotation in the case portion and the swing unit,
The swing drive unit includes a cam body that is drivingly linked to the motor, and a unit case that rotatably supports the cam body, and fixes a lower portion of the swing drive unit to the pedestal portion,
The cam body is positioned in the vertical direction, and an eight-shaped cam groove is formed in the vertical surface portion of the cam body on the unit case side.
The unit case is provided with a long hole facing the eight-shaped cam groove,
Further, the one case portion of the unit case at a position facing the elongated hole is provided with a front / rear drive control pin whose tip is inserted through the elongated hole and engaged with the eight-shaped cam groove. The swing mechanism of the electric fan is characterized by the above. A pedestal portion composed of a fan main body that performs a swing motion, a bottom plate and a base portion rotatably provided on the bottom plate, and a swing drive unit provided between the fan main body and the pedestal portion In the swing mechanism of a fan provided with a motor for swing drive in the swing drive unit,
The swing drive unit is held by the electric fan main body and provided with left and right unit cases fixed to the base portion of the pedestal portion, and is driven by rotation of the motor between the left and right unit cases. A cam body linked to the cam body, a rocking rack body that swings in conjunction with the cam body and has a rack at a rocking end thereof, and a ratchet gear that is held by the bottom plate of the base portion. And the rack of the swing rack body and the ratchet gear are meshed,
In addition, the electric fan main body includes one and other case portions that cover the swing drive unit, and the other case portion includes a swing drive unit that holds an upper end portion of the swing drive unit. A holding portion, and the holding portion and the upper end portion of the swing drive unit constitute a fulcrum portion of relative rotation in the case portion and the swing drive unit;
The cam body is positioned in the vertical direction, and an eight-shaped cam groove is formed in the vertical surface portion of the cam body on the unit case side.
The unit case is provided with a long hole facing the eight-shaped cam groove,
Further, the one case portion of the unit case at a position facing the elongated hole is provided with a front / rear drive control pin whose tip is inserted through the elongated hole and engaged with the eight-shaped cam groove. The swing mechanism of the electric fan is characterized by the above. The ratchet gear according to claim 1 or 3, wherein the ratchet gear includes a ratchet claw, and on the other hand, a tooth portion that engages with the ratchet claw is provided at a portion that holds the ratchet gear in the pedestal portion, thereby providing a ratchet structure. A fan swing mechanism characterized by comprising.

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