Patent Application
20180252225
The present invention relates to a transmission device, and more particularly to a transmission device of a fan.
The conventional fan can be swung back and forth through the transmission member 7. When the user wants to change the angle of the fan main body 1, the fan main body 1 is usually pulled by hand to forcibly turn the fan body 1. However, the fan main body 1 is connected to the transmission member 7 through the geared motor 2, the gear 5, and the spindle 6. When the user applies a force to pull the fan main body 1 for changing the angle of the fan main body 1 in the swing direction, the applied force exerted by the user indirectly affects the geared motor 2, the gear 5, and the spindle 6. The geared motor 2, the gear 5 and the spindle 6 may have gear slipping or gear jumping easily. After a long time, the clearance between the geared motor 2, the gear 5 and the spindle 6 may increase. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.
The primary object of the present invention is to provide a transmission device of a fan. When the fan is swung back and forth, the power of the motor is stably transmitted to the fan so that the fan can be swung swinging back and forth. When the user applies a force to the fan and the transmission device, the transmission device can prevent gear slipping or gear jumping of the related power transmission parts, such as a motor, a gear, and a spindle.
In order to achieve the aforesaid object, a transmission device of a fan is provided. The fan comprises a motor for swinging the fan back and forth and a connecting rod for swinging the fan back and forth. The motor is connected with a spindle through at least one gear. The spindle is fixedly connected to a central axis of the transmission device. The connecting rod is connected to an eccentric position of the transmission device, enabling the fan to be swung back and forth in a swing direction by the driving of the motor. The transmission device comprises a first casing, a second casing, at least one elastic member, and at least one press member. The first casing has a first annular surface corresponding to an axial direction of the spindle. The first annular surface of the first casing is provided with a plurality of spaced and raised press portions and an engaging recess formed between every adjacent two of the press portions. The second casing is pivotally connected to the first casing. The second casing has a second annular surface corresponding to the first annular surface of the first casing. The second annular surface is formed with at least one accommodation hole corresponding to the engaging recess. The elastic member is disposed in the accommodation hole of the second casing. The press member is disposed in the accommodation hole of the second casing. When the fan is swung back and forth, the press member is biased by the elastic member so that one end of the press member is exposed out of the accommodation hole to engage with the engaging recess of the first casing. The press member can be disengaged from the engaging recess of the first casing by an applied force from the adjacent two press portions, the applied force is at least equal to a force exerted by a user to change the angle of the fan in the swing direction.
Thereby, when the fan is swung back and forth, through the press member to engage with the engaging recess of the first casing, the first casing and the second casing of the transmission device are engaged with each other and cannot be turned, so that the transmission device provides a stable power to swing the fan back and forth. When the user applies a force to change the angle of the fan in the swing direction, the press member is pressed by the adjacent two press portions to compress the elastic member so that the press member disengages from the engaging recess of the first casing to enter the accommodation hole for turning the second casing relative to the first casing. The external force exerted by the user can be separated to prevent gear slipping or gear jumping of the motor, the gear, and the spindle.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
Referring to
The first casing 10 has a first annular surface 11 corresponding to an axial direction of the spindle 107. The first annular surface 11 is disposed on an inner wall of the first casing 10.The first annular surface 11 of the first casing 10 is provided with a plurality of spaced and raised press portions 12 and engaging recesses 13 each formed between every adjacent two of the press portions 12. An outer edge of each engaging recess 13 is provided with a chamfer 14. One side of the first casing 10 is provided with an opening 15, so that the first casing 10 is formed with an accommodation space 16 between the first annular surface 11 and the opening 15. An inner wall of another side of the first casing 10 is provided with at least two spaced ribs 17. The first casing 10 is provided with a first axial hole 18 corresponding to the spindle 107. The spindle 107 is pivotally connected to the first axial hole 18. The eccentric position of the first casing 10 is provided with a drive wheel 19 protruding outwardly for connecting the connecting rod 103.
The second casing 20 is disposed in the accommodation space 16 of the first casing 10. The second casing 20 is pivotally connected to the first casing 10. The second casing 20 has a second annular surface 21 corresponding to the first annular surface 11 of the first casing 10. The second annular surface 21 is disposed on an outer wall of the second casing 20. The second annular surface 21 is formed with two accommodation holes 22 corresponding to the engaging recesses 13. The second casing 20 is provided with a second axial hole 23 corresponding to the spindle 107. The spindle 107 is fixed to the second axial hole 23. An outer wall of one side of the second axial hole 23 is pivotally connected to the first axial hole 18 of the first casing 10. The ribs 17 are annularly disposed between the first casing 10 and the second casing 20 for reducing the friction between the first casing 10 and the second casing 20. Furthermore, a lubricant may be provided between the ribs 17 to reduce the friction between the first casing 10 and the second casing 20, and the ribs 17 are configured to prevent the lubricant from leaking. This reduces the influence of an external force on the motor 102 and prevents gear slipping or gear jumping of the gears 106 and the spindle 107.
The two elastic members 30 are disposed in the accommodation holes 22, respectively. One end 31 of the elastic member 30 is pressed against the bottom of the corresponding accommodation hole 22.
The two press members 40 are disposed in the accommodation holes 22, respectively. When the fan 101 is swung back and forth, the press member 40 is biased by the other end 32 of the corresponding elastic member 30, such that one end 41 of the press member 40 is exposed out of the corresponding accommodation hole 22 to engage with the corresponding engaging recess 13 of the first casing 10. Furthermore, the press member 40 may be disengaged from the corresponding engaging recess 13 of the first casing 10 by an applied force from the adjacent two press portions 12. The applied force is at least equal to the force exerted by the user to change the angle of the fan 101 in the swing direction. The press members 40 are spheres. When the transmission device 100 is assembled, through the chamfer 14 of the engaging recess 13, the press member 40 is mounted between the corresponding engaging recess 13 of the first casing 10 and the corresponding accommodation hole 22 of the second casing 20 more easily.
The fastener 50 is slightly greater than the first axial hole 18 of the first casing 10 to secure the spindle 107. The fastener 50 is disposed at an outer side of the first casing 10. An elastic element 51 is provided between the fastener 50 and the first casing 10. In the preferred embodiment of the present invention, the fastener 50 is a C-shaped buckle. The elastic member 51 is a wavy washer.
Referring to
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.
