초록 ▼

In accordance with an illustrative embodiment of the present invention, a steel post driving machine that is mounted on the lift mechanism of a tractor includes a mast having a tubular hammer slidably guided thereon, springs to accelerate the hammer downward, a cable to lift the hammer and lengthen

In accordance with an illustrative embodiment of the present invention, a steel post driving machine that is mounted on the lift mechanism of a tractor includes a mast having a tubular hammer slidably guided thereon, springs to accelerate the hammer downward, a cable to lift the hammer and lengthen the springs to store potential energy therein, and a mechanism coupled to the cable and powered by the PTO of the tractor for intermittently pulling on and then releasing the cable to cause the hammer to strike repeated impact blows on the top of the steel post. Upper and lower devices are included to maintain the mast in alignment with the post as the lift mechanism is being lowered and the post is being driven into the ground by the hammer.

대표청구항 ▼

A method for driving a lower portion of a steel post into the ground with a machine that is adapted to be mounted on the rear ends of pivotally arranged draft arms included in a lift mechanism of a farm tractor, comprising the steps of: mounting an upright mast and impact means on said mast for driv

A method for driving a lower portion of a steel post into the ground with a machine that is adapted to be mounted on the rear ends of pivotally arranged draft arms included in a lift mechanism of a farm tractor, comprising the steps of: mounting an upright mast and impact means on said mast for driving the lower portion of said steel post into the ground, operating the lift mechanism to raise said mast and impact means to a height that enables a top portion of the post to be positioned within said impact means; reciprocating said impact means while lowering said mast by operation of said lift mechanism to drive the said lower portion of said steel post into the ground; and using said post to maintain said mast in substantially vertical alignment therewith throughout the driving operation as said rear ends of said draft arms are lowered and pivoted downward during the driving operation, wherein said using step is carried out in part by engaging said post with a lower portion of said mast to cause said lower portion to slide forward and rearward with respect to said lift mechanism.