ELECTRIC FAN WITH IMPEDIMENT BUFFERING

• US 20140369835A1
• Filed: 06/16/2014
• Published: 12/18/2014
• Est. Priority Date: 06/17/2013
• Status: Active Grant

• Current Assignee: Wen Ching Lee
• Original Assignee: Wen Ching Lee
• Inventors: LEE, WEN CHING
• Granted Patent: US 9,702,369 B2
• Time in Patent Office: Days
• US Class Current: 416/100
• CPC Class Codes: F04D 19/007 multistage fans
• CPC Class Codes: F04D 25/105 by changing rotor axis direction, e.g. oscillating fans interconnecting rotary motion and oscillating motion F16H
• CPC Class Codes: F04D 25/166 using fans

Abstract

An electric fan includes a fan body having a fan shaft coupled to a fan motor. A fan motor bracket is connected to a fixing portion of the fan motor. A swivel shaft is coupled to the fan motor bracket. A sleeve is mounted around the swivel shaft and is coupled to an output shaft of a swivel motor. The sleeve includes an inner periphery having grooves. The swivel shaft receives an elastic element extending in a radial direction of the swivel shaft. A ball is mounted to an end of the elastic element. The ball is biased by the elastic element to be partially received in one of the grooves. If the fan body is impeded during the swiveling movement, the ball moves inward and compress the elastic element, disengaging the swivel shaft from the sleeve to reduce damage to the sleeve and the output shaft of the motor.

Claims

1. An electric fan with impediment buffering, comprising:

a fan body including a plurality of blades coupled to a fan shaft, with the fan shaft coupled to a fan motor, with the fan body further including a fan motor bracket connected to a fixing portion of the fan motor; and

an impediment buffering device including a swivel shaft coupled to the fan motor bracket and a sleeve mounted around the swivel shaft, with the sleeve coupled to an output shaft of a swivel motor, with the sleeve including an inner periphery having a plurality of grooves, with the swivel shaft receiving an elastic element extending in a radial direction of the swivel shaft, with a ball mounted to an end of the elastic element, and with the ball biased by the elastic element to be partially received in one of the plurality of grooves.

2. The electric fan with impediment buffering as claimed in claim 1, further comprising:

a support fixed in relation to the swivel shaft, with the support including a bearing cap receiving a ball bearing, with an electrically conductive copper ring mounted around the swivel shaft, with a tube mounted to the support and extending in a radial direction, with an electrically conductive spring received in the tube, with an electrically conductive bead attached to an end of the electrically conductive spring facing the electrically conductive copper ring, wherein when the electrically conductive copper ring rotates, the electrically conductive bead is biased by the electrically conductive spring to contact the electrically conductive copper ring, allowing 360°

rotation of the electrically conductive copper ring, and with the electrically conductive spring adapted to be connected to a power source.

3. The electric fan with impediment buffering as claimed in claim 1, further comprising:

an angle limiting switch including a detecting circuit board, with the detecting circuit board including a transmitter and a receiver, with the angle limiting switch further including a mounting frame fixed to the swivel shaft, with a light blocking plate extending outward from the mounting frame in a radial direction, with the detecting circuit board including a processor,

wherein when the receiver receives a signal and controls a rotating time of the swivel shaft, data in the processor is zeroed when the receiver is blocked by the light blocking plate, and

wherein after a rotating angle of the swivel shaft is set, leftward rotation and rightward rotation on left and right sides of a zeroed position are controlled by corresponding rotating time of an average rotating angle on the left and right sides of the zeroed position through data zeroing control.