Spring drive unit of pull-back windup type
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Jun 5, 1990
filing date -
Jun 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thin spiral spring drive unit, in particular for a toy car, employs a crown gear in a gear train between an output shaft and a drive shaft on which a spiral spring is wound as a source of the driving force. The unit can be assembled with a small number of component parts, in a simple structure and at lower cost. Simply by changing the direction of the output shaft when it is assembled into a gear box, the direction of rotation of the output shaft may be changed. The crown gear in the drive unit is arranged at a position substantially centeral to the width of a gear box. A pinion is arranged at two positions where the crown gear intersects with the output shaft to be meshed with the crown gear by means of a positioning mechanism. The crown gear is provided on its periphery with a windup gear and with a driving pinion on the shaft thereof so that the windup gear is engaged with a gear at the time of winding while it is directly engaged with a driving gear at the time of driving.
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