Patent ID: 6969080

Claim:
A front fork for a vehicle, comprising: an upper front fork tube; a lower front fork tube axially movably coupled to said upper front fork tube; a fluid contained in the upper and lower front fork tubes; and a damper immersed in the fluid; wherein said damper comprises: a cylindrical main body fixedly sealedly fastened to a bottom side inside said upper front fork tube, said main body having a fluid inlet and a fluid outlet axially extended therethrough, and at least one through hole in communication between said fluid inlet and an outside of said cylindrical main body; a first blocking member mounted in the fluid inlet of said main body and movable between a first blocking position where said first blocking member blocks said through hole to prohibit flowing of said fluid from said lower front fork tube upwards to said upper front fork tube, and a first opening position where said first blocking member is moved away from said through hole for enabling said fluid to pass upwards from said lower front fork tube through said fluid inlet and said through hole to said upper front fork tube; a first spring member mounted in said fluid inlet for holding said first blocking member in said first blocking position; a second blocking member mounted in said fluid inlet above said first blocking member and movable between a second blocking position where said second blocking member blocks said fluid inlet, and a second opening position where said second blocking member opens said fluid inlet; a second spring member mounted in said fluid inlet for pushing said second blocking member to said second blocking position; a control rod inserted into said upper front fork tube and movable by an external force between a locking position where said second blocking member is positioned in said second blocking position, and an unlocking position wherein said control rod pushes said second blocking member to said second opening position and holds said second blocking member in said second opening position; a third blocking member mounted in said fluid outlet of said main body and movable between a third blocking position where said third blocking member prohibits said fluid from passing upwards from said lower front fork tube through said fluid outlet of said main body to said upper front fork tube, and a third opening position where said fluid is allowed to flow downwards from said upper front fork tube through said fluid outlet to said lower front fork tube; and a third spring member mounted in said fluid outlet for holding said third blocking member in said third blocking position.