Protection Device For Speed Shifting Mechanism
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United States of America Patent
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Issued Date -
Sep 17, 2009
app pub date -
Mar 16, 2008
filing date -
Mar 16, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A protection device for a speed shifting mechanism includes a case with a gear reduction unit received therein, and a tube is rotatably mounted to the case. The tube includes a plurality of positioning notches and a guide groove. A button mechanism includes an activation rod which is connected to the gear reduction unit and a shifter is connected to the activation rod. The shifter is engaged with the guide groove and a button is secured on the shifter. A control member includes a positioning plate which has a protrusion. The shifter is moved by operation of the button and the tube is rotated along with the movement of the shifter. When the protrusion is engaged with one of the positioning notches, the tube is locked and cannot rotate such that the shifter cannot be shifted unintentionally.
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