ROTATION CONTROL DEVICE OF MULTI-ROTOR CEILING FAN

Abstract

A rotation control device of a multi-rotor ceiling fan includes a fixed unit. The fixed unit is provided with a fixed gear. The fixed unit is pivotally connected with a movable unit. A driving member is fixed to the movable unit. The driving member has a driving gear. The driving gear meshes with the fixed gear. The driving member is provided with at least one pair of support rods. The distal ends of the support rods are respectively connected with a fan. The driving member brings the movable unit to turn at a constant speed relative to the fixed unit for the fans to revolve round the fixed unit, producing stable airflow to the surrounding by 360-degree rotation.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a rotation control device of a multi-rotor ceiling fan.

2. Description of the Prior Art

FIG. 1 is a side view of a conventional multi-rotor ceiling fan. The conventional multi-rotor ceiling fan comprises a shaft 1. One end of the shaft 1 is pivotally connected with a seat member 2. The other end of the shaft 1 is fixed to the ceiling (not shown in the drawing). The shaft 1 is provided with a power supply portion 3 which is located close to the seat member 2. The seat member 2 is provided with a corresponding load portion 4. The load portion 4 gets contact with the power supply portion 3. The seat member 2 is provided with a pair of support rods 5 extending outward. The distal ends of the support rods 5 are respectively connected with a fan 6. The fans 6 are electrically connected to the load portion 4. When the multi-rotor ceiling fan is started, the power supply portion 3 will supply power to the load portion 4. The load portion 4 further transmits the power supply to the fans 6, such that the fans 6 are rotated. By the inertia force generated by rotation of the fans 6, the fans 6 also revolve round the seat member 2, producing airflow to the surrounding by 360-degree rotation.

However, because the fans 6 revolve round the seat member 2 by the inertia force generated by rotation of the fans, the revolution speed of the fans 6 will be influenced by the rotation speed of the fans 6. That is to say, the higher the rotation speed, the higher revolution speed there will be. That results in that the conventional multi-rotor ceiling fan cannot produce stable airflow to the surrounding by 360-degree rotation. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a rotation control device of a multi-rotor ceiling fan to produce stable airflow to the surrounding by 360-degree rotation.

In order to achieve the aforesaid object, the rotation control device of a multi-rotor ceiling fan of the present invention comprises a fixed unit, a fixed gear, a movable unit, and a driving member. The fixed unit has a housing. The housing has an accommodation room and an opening at one side thereof. The housing further has an axial hole at another side thereof. The fixed unit comprises a shaft connected to the axial hole. The shaft is provided with a power supply portion. The fixed gear is fixed to the fixed unit. The fixed gear has a fixed toothed portion which is disposed round the shaft. The movable unit comprises a seat member which is pivotally connected to the shaft. The movable unit comprises at least one pair of support rods extending outward from the seat member and disposed relative to the shaft. The distal ends of the support rods are respectively connected with a fan. The seat member of the movable unit is provided with a load portion. The load portion gets contact with the power supply portion. The driving member is fixed to the movable unit and has a motor. The motor is electrically connected to the load portion. The motor is further connected with a driving gear. The driving gear has a driving toothed portion. The driving toothed portion meshes with the fixed toothed portion.

The driving member is fixed to the seat member, the seat member is pivotally connected to the shaft, and the fixed gear is fixed to the shaft and not free. When the multi-rotor ceiling fan is started, the driving gear is moved along the inner edge of the fixed gear and synchronously brings the seat member to rotate with the shaft as the center shaft. Thus, the movable unit turns at a constant speed relative to the fixed unit for the fans connected to the support rods to revolve round the fixed unit, producing stable airflow to the surrounding by 360-degree rotation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a conventional multi-rotor ceiling fan;

FIG. 2 is a perspective view according to a first embodiment of the present invention;

FIG. 3 is a sectional view according to the first embodiment of the present invention;

FIG. 4 is a schematic view showing operation of the first embodiment of the present invention;

FIG. 5 is a perspective view according to a second embodiment of the present invention; and

FIG. 6 is a sectional view according to the second embodiment of the present invention.

FIG. 7 is a schematic view showing operation of the second embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

As shown in FIG. 2 and FIG. 3, the rotation control device 100 of a multi-rotor ceiling fan according to a first embodiment of the present invention comprises a fixed unit 10, a fixed gear 20, a movable unit 30, and a driving member 40.

The fixed unit 10 has a housing 11. The housing 11 has an accommodation room 111 and an opening 112 at one side thereof. The housing 11 further has an axial hole 113 at another side thereof. The fixed unit 10 comprises a shaft 12 connected to the axial hole 113. The shaft 12 is provided with a power supply portion 13.

The fixed gear 20 is an annular member 21 which is fixed to the fixed unit 10. The fixed gear 20 has a fixed toothed portion 22 which is disposed round the shaft 12. In this embodiment, the annular member 21 has an outer annular surface 211 and an opposing inner annular surface 212. The outer annular surface 211 is fixed to the opening 112 of the housing 11. The inner annular surface 212 has the fixed toothed portion 22 thereon.

The movable unit 30 comprises a seat member 31 which is pivotally connected to the shaft 12. The seat member 31 has a lower seat 311 which is pivotally connected to the shaft 12 and an upper seat 312 which is located above the lower seat 311. The movable unit 30 comprises at least one pair of support rods 32 extending outward from the lower seat 311 of the seat member 31 and disposed relative to the shaft 12. The distal ends of the support rods 32 are respectively connected with a fan (not shown in the drawings). The upper seat 312 of the seat member 31 of the movable unit 30 is provided with a load portion 33. The load portion 33 gets contact with the power supply portion 13.

The driving member 40 is fixed to the lower seat 311 of the movable unit 30 and has a motor 41. The motor 41 is electrically connected to the load portion 33. The motor 41 is further connected with a driving gear 42. The driving gear 42 has a driving toothed portion 421. The driving toothed portion 421 meshes with the fixed toothed portion 22.

FIG. 4 is a schematic view showing operation of the first embodiment of the present invention. When the multi-rotor ceiling fan is started, the power supply portion 13 will supply power to the load portion 33. The load portion 33 further transmits the power supply to the motor 41, such that the motor 41 runs to drive the driving gear 42 to turn. Because the driving member 40 is fixed to the seat member 31 and the seat member 31 is pivotally connected to the shaft 12 and the fixed gear 20 is fixed to the shaft 12 and not free, the driving gear 42 is moved along the inner edge of the fixed gear 20 as shown in FIG. 4 and synchronously brings the seat member 31 to rotate with the shaft 12 as the center shaft. Thus, the movable unit 30 turns at a constant speed relative to the fixed unit 10 for the fans connected to the support rods 32 to revolve round the fixed unit 10, producing stable airflow to the surrounding by 360-degree rotation.

It is noted that the fixed toothed portion 22 of the fixed gear 20 meshes with the driving toothed portion 421 of the driving gear 42 to resist the inertia force generated by rotation of the fans. Therefore, the movable unit 30 can be turned steady relative to the fixed unit 10 by the driving member 40, not influenced by the rotation speed of the fans.

FIG. 5 is a perspective view according to a second embodiment of the present invention. FIG. 6 is a sectional view according to the second embodiment of the present invention. The rotation control device 100 of the multi-rotor ceiling fan of the second embodiment is substantially similar to the first embodiment with the exceptions described hereinafter. The fixed gear 20 is a disc member 23. The disc member 23 has a through hole 231 at a central portion thereof for connection of the shaft 12. The disc member 23 is fixed to the shaft 12 and located between the lower seat 311 and the upper seat 312. The disc member 23 has the fixed toothed portion 22 around an outer wall thereof. The fixed toothed portion 22 meshes with the driving portion 421 of the driving member 40. The fixed gear 20 is fixed to the shaft 12 and not free. When the multi-rotor ceiling fan is started, the driving gear 42 is moved along the inner edge of the fixed gear 20 as shown in FIG. 7 and synchronously brings the seat member 31 to rotate with the shaft 12 as the center shaft. Thus, the movable unit 30 turns at a constant speed relative to the fixed unit 10 for the fans connected to the support rods 32 to revolve round the fixed unit 10, producing stable airflow to the surrounding by 360-degree rotation. The second embodiment achieves the same effect as the first embodiment.

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.

Claims

1. A rotation control device of a multi-rotor ceiling fan, comprising:

a fixed unit having a housing, the housing having an accommodation room and an opening at one side thereof, the housing further having an axial hole at another side thereof, the fixed unit comprising a shaft connected to the axial hole, the shaft being provided with a power supply portion;

a fixed gear fixed to the fixed unit, the fixed gear having a fixed toothed portion which is disposed round the shaft;

a movable unit comprising a seat member which is pivotally connected to the shaft, the movable unit comprising at least one pair of support rods extending outward from the seat member and disposed relative to the shaft, distal ends of the support rods being respectively connected with a fan, the seat member of the movable unit being provided with a load portion, the load portion getting contact with the power supply portion; and

a driving member fixed to the movable unit and having a motor, the motor being electrically connected to the load portion, the motor being further connected with a driving gear, the driving gear having a driving toothed portion, the driving toothed portion meshing with the fixed toothed portion.

2. The rotation control device of a multi-rotor ceiling fan as claimed in claim 1, wherein the fixed gear is an annular member, the annular member having an outer annular surface and an opposing inner annular surface, the outer annular surface of the annular member being fixed to the opening of the housing, the inner annular surface having the fixed toothed portion thereon.

3. The rotation control device of a multi-rotor ceiling fan as claimed in claim 1, wherein the fixed gear is a disc member, the disc member having a through hole at a central portion thereof for connection of the shaft, the disc member being fixed to the shaft, the disc member having the fixed toothed portion around an outer wall thereof.