公开(公告)号：US09821774B1

公开(公告)日：2017-11-21

申请号：US14195014

申请日：2014-03-03

申请人： Craig Alan Searer ,  Randall James Clay ,  David W. Busch

发明人： Craig Alan Searer ,  Randall James Clay ,  David W. Busch

IPC分类号： F16H57/04 ,  B60S9/08 ,  B66F3/08 ,  B66F3/44 ,  F16N1/00 ,  F16H25/22 ,  F16H25/20

CPC分类号： B60S9/08 ,  B66F3/08 ,  B66F3/44 ,  F16H25/20 ,  F16H25/2204 ,  F16H57/0464 ,  F16H57/0497 ,  F16N1/00 ,  Y10T74/18576 ,  Y10T74/18744

摘要： 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%.