Elastic extension device and retractable pulling rod using the same
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United States of America Patent
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May 13, 2014
Grant Date -
May 16, 2013
app pub date -
May 16, 2012
filing date -
Nov 15, 2011
priority date (Note) -
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Abstract
A retractable pulling rod utilizing an elastic extension device, comprising: a pulling rod set, a plug set, and elastic extension device. The pulling rod set is provided with a first socket, a second socket, and a third socket, sleeved onto each other through their ends of small diameters, and each is provided with at least a positioning hole. A first plug and a second plug are disposed respectively at bottom ends of first socket and second socket, to dispose a protrusion tenon of elastic extension device in an indentation slot inside second socket. Through using elastic extension device to assist steel beads of first plug and second plug to position in or detach from positioning hole, retractable pulling rod is extended or retracted smoothly.
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