Electric heating – Metal heating – Of cylinders
Patent
1986-10-22
1987-09-15
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 126338, 108 20, 99443R, H05B 678
Patent
active
046941320
ABSTRACT:
A microwave oven turntable having a removable table top driver at various points about its circumference. The turntable includes a base having a flat bottom and an upwardly extending cylindrical side wall. A central drive shaft is rotatably mounted to the base bottom to form a vertical axis of rotation. A spring provides rotational energy to the drive shaft. A dependent gear is coaxially mounted to the drive shaft and the dependent gear meshes with a gear train that governs the rate of drive shaft rotation so as to ensure a relatively constant rotational speed. The spring and gears are encased by a circular base cover member having a center aperture through which a portion of the drive shaft projects. A spider drive member is attached to the portion of the drive shaft projecting through the base cover member for rotation therewith. The spider drive member rests on a retainer ring having spherical balls and is additionally supported by freely rotatable wheels. Radial spider arms of the spider drive member frictionally contact the removable table top having a circular platform and cylindrical side walls. The circular platform has a lower surface containing a plurality of radially inwardly extending ribs that are concentrically spaced about the axis of rotation from the circumferential periphery. The ribs further extend downwardly along the cylindrical side wall of the table top to transfer rotational motion from the spider drive member to the table top. A braking mechanism is included to selectively render the gear train inoperative, thereby preventing table top rotation.
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