An extendable shaft includes: an inner shaft including a plurality of external teeth; an outer shaft including a plurality of internal teeth that slides relatively to the external teeth; and a resin layer covering the external teeth. The pressure angle of the external teeth is different from the pressure angle of the internal teeth.
EXTENDABLE SHAFT
2021-10-28
Patent
Electronic Resource
English
Inner shaft for extendable and contractible shaft and manufacturing method thereof
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