Patent ID: 6988600

Claim:
A high frequency dampening apparatus, comprising: an enclosed housing having a fluid disposed therein; a piston rod slidably disposed within said housing, and said piston rod engageable with a driver for movement between a forward position and a rearward position; a first structure extending from said piston rod and having a first passageway extending therethrough; a second structure extending from said piston rod and axially spaced from said first structure, and said second structure having a second passageway smaller than said first passageway; a piston head captured between said first and second structures for movement between said rearward position, wherein said piston head engages said first structure when moving toward said rearward position allowing said fluid to freely flow through said first passageway and allowing said piston rod to freely travel to said rearward position, and said forward position, wherein said piston head engages said second structure when moving toward said forward position restricting the flow of fluid through said second passageway to slow the travel of said piston rod to said forward position; a first compression spring disposed within said housing and seated against said second structure to bias said piston rod toward said forward position; a piston rod bearing disposed within said housing for slidably and sealingly receiving said piston rod, and said piston rod bearing engaging said first compression spring; and a second compression spring disposed within said housing and seated against said housing and said piston rod bearing for maintaining fluid pressure within said housing.