Suspension seatpost for the seat of a bicycle

Details Suspension seatpost for the seat of a bicycle Suspension seatpost for the seat of a bicycle

1999-08-09

2001-01-23

Schwartz, Christopher P. (Department: 3613)

Spring devices

Seat support

Velocipede or motorcycle

Reexamination Certificate

active

06176476

ABSTRACT:

CROSS-REFERENCES TO RELATED APPLICATIONS
Not Applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suspension seatpost, and more particularly to a suspension seatpost for the seat of a bicycle.
2. Description of the Related Art
A conventional suspension seatpost (
1
) in accordance with the prior art shown in
FIG. 3
is used for a bicycle and comprises a fixed tube (
11
) secured in the seat tube (
30
) and containing a chamber (
110
) therein, an abutting block (
112
) secured in the chamber (
110
) of the fixed tube (
11
), a slide rod (
12
) slidably mounted in the fixed tube (
11
) and having its upper end secured to the seat (
2
) by means of a connector (
14
), and a spring (
13
) mounted between the abutting block (
112
) and the lower end of the slide rod (
12
).
When the bicycle is subjected to vibration such as on a rugged road, a force will be exerted on the frame (
3
) to move the frame (
3
) upward. The slide rod (
12
) is then moved downward in the chamber (
110
) relative to the frame (
3
) to compress the spring (
13
), thereby providing a shock absorbing function so as to prevent the shock from being directly transmitted to the seat (
2
).
However, the spring (
13
) has a great stiffness such that the spring (
13
) will produce a small amount of deformation during the compressing process thereof. Consequently, the spring (
13
) cannot completely absorb the most of energy from vibration, thereby decreasing the shock absorbing effect of the suspension seatpost (
1
). The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional suspension seatpost.
BRIEF SUMMARY OF THE INVENTION
The present invention is to provide a suspension seatpost for a bicycle. The suspension seatpost comprises a fixed tube secured in the seat tube of the bicycle and containing a chamber therein, a slide rod axially movable mounted in the fixed tube and having an upper end secured to the seat of the bicycle, a follower mounted in the lower end of the slide rod by a bolt to move therewith, and a buffer mounted in the fixed tube.
The buffer includes a tube, a floating piston placed in the tube to divide the space into an upper chamber filled with oil and a lower chamber filled with gas, a piston rod slidably installed in the upper chamber of tube and having an upper end abutting against the bolt, and a piston mounted in the lower end of the piston rod to move therewith.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 5028037 (1991-07-01), Wang
patent: 5044648 (1991-09-01), Knapp
patent: 5115723 (1992-05-01), Wang
patent: 5301974 (1994-04-01), Knapp
patent: 5855363 (1999-01-01), Svendsen

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