Automatic ladder having length adjustable by electric driver
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Jan 18, 2022
Grant Date -
Oct 17, 2019
app pub date -
Oct 31, 2017
filing date -
Oct 31, 2017
priority date (Note) -
In Force
status (Latency Note)
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Abstract
According to the present invention, a ladder having an adjustable length comprises: a first support including a first outer support and a first inner support inserted into the first outer support; a horizontal foothold for connecting the first supports to each other; a first gear formed at the inner side of the horizontal foothold and having a groove part formed therein; a second gear engaging with the first gear and changing the rotational direction of the first gear; a rotary bar coupled to the second gear; a third gear formed at the end of one side of the rotary bar; a screw bolt having a fourth gear, which engages with the third gear and is formed at the end thereof, formed inside the first inner support, formed in a stick type, and having threads formed on the outer side thereof; and a screw nut in which the screw bolt is formed, and to which the first inner support is coupled at the outer side thereof.
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