JPS645110Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an oscillating device for changing the air blowing direction of an electric fan.

(b) Prior art Head 1 of a conventional electric fan shown in Figures 1 and 2
The pivot 3 is rotatably supported by the neck piece 2, and the L is fixed to the tip of the pivot 3 by caulking.
A letter-shaped mounting plate 4, a motor 5 whose front lower surface is supported by the mounting plate 4, a front cover 6 mounted on the front surface of the motor 5, and a swinging device mounted on the rear surface of the motor 5. 7, and a rear cover 8 that covers the motor 5 and the swinging device 7.

The swinging device 7 includes a sheet metal cross-sectional board 10 fixed to the rear surface of the motor 5 with screws 9, and a synthetic resin removably attached to an elastic locking claw piece 11 that closes the top surface of the board 10. A pinion clutch shaft 15 is mounted on a cover plate 12, a bearing 13 of the cover plate 12, and a bearing 14 of the base plate 10 so as to be vertically movable.
A cylindrical shaft 19 is rotatably supported by the pinion clutch shaft 15 and has a worm wheel 18 that engages with a worm 17 formed on a rotating shaft 16 protruding from the rear surface of the motor 5, and a cylindrical shaft 19 formed on the outer lower surface of the base plate 10. A crank gear 22 is supported by a crimp pin 20 in a hanging manner and meshes with a pinion 21 formed at the lower end of the clutch shaft 15 protruding from the base plate 10.
and a pivot 2 protruding from the lower surface of the crank gear 22.
One end is pivotally supported by the neck piece 2, and the other end is supported by the neck piece 2.
It consists of a swing link 25 pivotally supported on a pivot 24. A clutch body 28 biased outwardly by a spring 27 is housed in an insertion hole 26 formed in the pinion clutch shaft 15. Said cylindrical shaft 19
Clutch teeth 29 with which the clutch body 28 engages are formed on the inner surface. Bearing 1 of the lid 12
3 has a recess 30 around it, and the clutch body 28 engages in the recess 30 when the pinion clutch shaft 15 is pulled up.

In the above conventional structure, the crank gear 22
This is done by a crimping pin 20 inserted from the bottom surface and fixed to the board 10 by crimping.
is of large diameter. Therefore, the pivot 23 cannot be formed inside the head of the crimping pin 20, and the distance A between the pivot 23 and the crimping pin 20 cannot be made small. The distance A
When it becomes necessary to design a product with a smaller oscillation angle due to the inability to reduce the oscillation angle, in the past, the distance A could not be made sufficiently small, so the oscillation angle could not be sufficiently reduced to the required angle.

(c) Purpose of the invention The present invention is designed to provide stable rotation of the crank gear without runout, and to allow the distance between the rotation center of the cam gear and the rotation center of the oscillating link to be set to an appropriate dimension position as required. The present invention provides a swinging device for an electric fan.

(d) Structure of the invention In this invention, a cylindrical shaft support that protrudes downward is formed on the bottom plate of a gear case formed at the rear of the electric motor, and an oscillating pinion that is driven in conjunction with the electric motor is suspended from the bottom plate of the gear case. A crank gear that meshes with the oscillating pinion is fitted and supported on the cylindrical shaft support, and the crank is screwed into the crank gear from inside the gear case through the cylindrical shaft support. This structure prevents the gear from coming off and allows the pivot of the oscillating link to be formed at an appropriate location on the lower surface of the crank gear.

(e) Embodiment The same structural parts as those of the prior art shown in FIGS. 1 and 2 are designated by the same names and symbols,
The explanation will be omitted.

A cylindrical shaft support 31 is formed on the bottom surface of the substrate 10 and projects downward. The crank gear 32 is formed with an annular groove 33 into which the cylindrical shaft support 31 is fitted. The upper surface of the crank gear 32 located within the cylindrical shaft support 31 is substantially flush with the inner surface of the base plate 10. A screw hole 34 is formed in the center of the upper surface of the cylindrical shaft support 31 of the crank gear 32, and a projection 35 is formed around the periphery. A gear mounting plate 36 is fitted into the protrusion 35 of the crank gear 32 from the inside of the base plate 10, and the mounting plate 36 is attached to the crank gear 32 with screws 37 screwed into the screw holes 34. The mounting plate 36 is formed to have a larger diameter than the cylindrical shaft support 31, and prevents the crank gear 32 from coming off. Note that the crank gear 32 is not prevented from coming off by the mounting plate 36 as in this embodiment, but by the screw 3.
It is also possible to use a large-diameter plate for the head part 7. The crank gear 32 rotates around the screw 37, and is guided by the large-diameter cylindrical shaft support 31, providing stable rotational support without wobbling. A pivot 3 that pivotally supports one end of the swing link 25
8 is vertically installed on the lower surface of the crank gear 32.
The pivot shaft 38 is located at the crank gear 32.
Since there is no part on the underside of the holder that prevents the holder from being formed, the holder can be placed in any desired design position. Therefore, the distance a from the center of rotation of the crank gear 32 to the center of the pivot shaft 38 can be made as small as necessary. The swing link 25 is prevented from coming off the pivot 38 by a screw 39 and a washer 40.

(f) Effects of the invention This invention simplifies the structure by supporting the crank gear with a cylindrical shaft support, providing stable rotational support with little runout, and preventing it from coming off with a screw that is screwed in from the inside. Therefore, the crank gear can be easily attached, and the lower surface of the crank gear can be used effectively.

[Brief explanation of drawings]

Figure 1 is a sectional view of the head of a fan showing the conventional technology;
FIG. 2 is a cross-sectional view along the line shown in FIG. 1, FIG. 3 is a cross-sectional view of essential parts showing an embodiment of the present invention, and FIG. 4 is an exploded perspective view of the same. 10... Board (gear case), 15... Pinion clutch shaft (oscillating pinion), 31... Cylindrical shaft support, 32... Crank gear, 37... Screw.

Claims (1)

[Scope of utility model registration request] A cylindrical shaft support projecting downward is formed on a bottom plate of a gear case formed at the rear of the electric motor, an oscillating pinion driven in conjunction with the electric motor is provided vertically from the bottom plate of the gear case, and a crank engages with the oscillating pinion. A fan in which a gear is fitted and supported on the cylindrical shaft support, and the crank gear is prevented from coming off by a screw that is screwed into the crank gear from inside the gear case through the cylindrical shaft support. head oscillation device.