Seat suspension device

DETAILED DESCRIPTION The present invention provides a seat suspension device which comprises a base member capable of being disposed to a seat tube and having two lugs extending therefrom, each of the lugs having a first and a second hole.
A first bar has a first upper tube transversely disposed to an upper end thereof and a first lower tube transversely disposed to a lower end thereof.
The first lower tube is pivotally disposed between the two lugs and in alignment with the first holes, a cut-away portion defined transversely in the first lower tube.
A second bar has a second upper tube transversely disposed to an upper end thereof and a second lower tube transversely disposed to a lower end thereof.
The second lower tube is pivotally disposed between the two lugs and in alignment with the second holes.
Two plates each have a first and a second aperture defined therein, and a recess defined in an inner side of a lower end thereof.
Two clamping means is fixedly mounted outside the two plates by extending a bolt through the clamping means, the first apertures and the second upper tube which is pivotally connected between the two plates.
The other bolt extends through the clamping means, the two second apertures and the first lower tube which is pivotally connected between the two plates.
A deformable means has a rod extending from one of two ends thereof and the rod is pivotally connected between the two lugs.
Two studs extend from two opposite sides of the deformable means and are pivotally received in the two recesses of the two plates.
It is an object of the present invention to provide a seat suspension device having a deformable means disposed laterally to a seat tube.
It is another object of the present invention to provide a seat suspension device having a long compression stroke of its deformable means.
It is a further object of the present invention to provide a seat suspension device having a long travel of the seat when a large impact is applied thereto.
It is still another object of the present invention to provide a seat suspension device which effectively prevents a rider from dropping from the seat