Electromagnetic Swinging Cradle

Abstract

A cradle includes a base unit, a swinging unit mounted on the base unit, a table board mounted on the swinging unit, and an electromagnetic unit mounted between the base unit and the table board. The electromagnetic unit includes a housing secured on the base unit, an electromagnetic device mounted in the housing, a box mounted on the table board and corresponding to the electromagnetic device, and two magnet sets mounted in the box. Thus, the electromagnetic device is started and produces a magnetism to repel or attract the two magnet sets which drive the table board to swing reciprocally.

1 . A cradle comprising:
 a base unit;   a swinging unit mounted on the base unit;   a table board mounted on the swinging unit; and   an electromagnetic unit mounted between the base unit and the table board;   wherein:   the base unit includes two stands and two side support rods secured between the two stands;   one of the two stands is provided with a recessed portion;   the swinging unit includes two primary swinging brackets, four secondary swinging brackets, two links and an enclosed bar;   two of the four secondary swinging brackets are pivotally connected with one of the two side support rods and located beside the two stands, and the other two of the four secondary swinging brackets are pivotally connected with the other one of the two side support rods and located beside the two stands;   each of the two links is secured between two of the four secondary swinging brackets;   one of the two primary swinging brackets is pivotally connected with two of the four secondary swinging brackets and located beside one of the two stands, and the other one of the two primary swinging brackets is pivotally connected with the other two of the four secondary swinging brackets and located beside the other one of the two stands;   the enclosed bar is mounted on the two primary swinging brackets;   the table board is mounted on and supported by the two primary swinging brackets of the swinging unit;   the electromagnetic unit includes a housing secured on the recessed portion of the base unit, an electromagnetic device mounted in the housing, a box mounted on the table board and corresponding to the electromagnetic device, and two magnet sets mounted in the box;   the box has an interior provided with two receiving chambers, and an opening defined between the two receiving chambers; and   the two magnet sets are mounted in the two receiving chambers of the box.   
     
     
         2 . The cradle of  claim 1 , wherein each of the two distal ends of each of the two stands is provided with a castor. 
     
     
         3 . The cradle of  claim 1 , wherein each of the two primary swinging brackets is pivotally connected with a fastener which is pivotally connected with and hooked on one of the four secondary swinging brackets to restrict swinging of the two primary swinging brackets and the four secondary swinging brackets. 
     
     
         4 . The cradle of  claim 1 , wherein the housing of the electromagnetic unit includes two shells juxtaposed to each other and combined together. 
     
     
         5 . The cradle of  claim 1 , wherein:
 each of the two magnet sets includes two overlapping magnets.   each of the two stands is substantially inverted U-shaped and has two distal ends extending downward;   the recessed portion is located at a middle position of an upper portion of the one of the two stands;   the two side support rods flank the recessed portion of the one of the two stands;   the two links are parallel with the two side support rods;   each of the two primary swinging brackets is substantially U-shaped and has two distal ends extending upward;   the enclosed bar is secured to the two distal ends of each of the two primary swinging brackets;   the housing is disposed under the box;   the box has an elongate shape and is located beneath the table board; and   the two receiving chambers of the box are directed toward a direction the same as that of the two side support rods.