Patent ID: 6824473
Filing Date: 2004-11-30
Classification: A47D

Abstract:
A swing control device for a swing chair having a motor, a worm gear matingly engaged with a threaded spindle of the motor and having an eccentric pin, a linkage pivotally clamped between first and second halves of a housing and having a slot defined to receive the eccentric pin therethrough, a battery compartment in the second half for receiving therein batteries to provide electric power to the motor, a first bearing provided to the linkage to smoothen the pivotal movement of the linkage, a recoil element one end of which is securely connected to a cover to provide a recoil force to the linkage, an axle extending through the recoil element and engaged with the linkage, a second bearing provided to the axle to provide smoothness to the pivotal movement of the axle, an enclosure provided to receive the second bearing, the axle, the recoil element and the cover therein and a cap mounted on an outside of the enclosure to limit the extension of the axle, wherein the improvements comprise:a swing control device having a sensing element mounted on the enclosure and having holes so defined that the rotation of the linkage blocks some of the holes, a sensor sensing the number of blocked holes and sending a signal to a circuit board to match with a predetermined number in the circuit board and then sending out a correction signal to the linkage to adjust the amplitude of the pivotal movement of the linkage.