Method and apparatus for jackscrew with integral drive nut grease fitting
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United States of America Patent
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Nov 21, 2017
Issued Date -
N/A
app pub date -
Mar 3, 2014
filing date -
Mar 4, 2013
priority date (Note) -
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Abstract
An improved device and method of lubrication for a tongue jack, 5th wheel jack, or other jack or other threaded positioning device. Ports are provided in the inner and outer tubes of the jack. The aligned ports provide access to a lubrication cavity in the jacknut. The lubrication cavity may include a grease fitting such as a zerk fitting. When the ports are in alignment, a grease gun can be inserted easily to the zerk fitting to apply grease to the interior structure of the nut as well as to the threads of the jackscrew. The lubricant may be introduced directly at a region of contact between a screw and the load bearing element. Applicant's test results show that this improved lubrication can increase the life cycle of the jack by more than 100%.
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