发明名称 Fence post extraction tool
摘要 The fence post extraction tool is a tool used to extract a wooden fence post from the ground using only vertical movement. The wooden fence post extraction tool includes a threaded rod that screws into an expanding piercing tip. The expanding piercing tip is driven into a pre-drilled hole located on a top surface of the wooden fence post. The piercing tip is driven into the hole via a hammer sleeve that is slideable engaged about the threaded rod. The threaded rod is attached to an attachment clip located at a distal end from the piercing tip. The attachment clip secures to a lifting means suspended under a tripod, and which lifts the wooden fence post vertically from the ground.
申请公布号 US8944410(B1) 申请公布日期 2015.02.03
申请号 US201213717948 申请日期 2012.12.18
申请人 发明人 Skubisz Robert
分类号 E21B19/00;B21F9/00;B23P19/04;E04H17/26 主分类号 E21B19/00
代理机构 代理人 Fletcher, Esq. Kyle A.
主权项 1. The fence post extraction tool comprising: a threaded rod threadably engaged to a piercing tip that is hammered into a pre-drilled hole located on a top surface of a wooden fence post to be extracted upwardly along a vertical axis; wherein an attachment clip is secured between the threaded rod and a lifting means that is suspended under a tripod; wherein the threaded rod is of a length and has a bottom distal end as well as top distal end; wherein the bottom distal end includes a shoulder from which are bottom external threading; wherein the top distal end includes top external threadings for use with a threaded nut; wherein a hammer sleeve is included with the threaded rod and is slideably engaged therewith; wherein the hammer sleeve has the shape of a hollowed cylinder having an inner diameter greater than an outer diameter of the threaded rod; wherein the attachment clip has an “L” shape further defined by a vertical portion and a horizontal portion; wherein the vertical portion includes a “+” shaded opening whereas the horizontal portion and vertical portion share a grooved slot; wherein the grooved slot enables the top distal end to pass through and engage against the threaded nut.
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