Seat post assembly with an adjustable stroke

Patent metadata

Field	Value
Publication number	US-2023264771-A1
Application number	US-202318169184-A
Country	US
Kind code	A1
Filing date	Feb 14, 2023
Priority date	Feb 18, 2022
Publication date	Aug 24, 2023
Grant date	—

Abstract

A seat post assembly for a bicycle includes a first tube having a first distal end, and a second tube having a second distal end. The first tube is movable relative to the second tube to establish a distance between the first distal end and the second distal end. The distance is at a maximum distance when the first tube is in a first position relative to the second tube. The seat post assembly includes a seal disposed within the second tube and connected to the first tube or the second tube. The seat post assembly includes a piston coupled to the seal when the first tube is in the first position. A position of the seal relative to the second distal end is adjustable, such that the first position of the first tube relative to the second tube is adjustable via the coupling between the piston and the seal.

First claim

What is claimed is:

1 . A seat post assembly for a bicycle, the seat post assembly comprising:
a first tube having a first distal end; a second tube having a second distal end, the first tube being movable relative to the second tube to establish a distance between the first distal end of the first tube and the second distal end of the second tube along a tube axis, the distance between the first distal end of the first tube and the second distal end of the second tube being at a maximum distance when the first tube is in a first position relative to the second tube, and the distance between the first distal end of the first tube and the second distal end of the second tube being at a minimum when the first tube is in a second position relative to the second tube; a seal disposed within the second tube, the seal being connected to the first tube or the second tube; a piston that is coupled to the seal when the first tube is in the first position relative to the second tube, wherein a position of the seal relative to the second distal end of the second tube is adjustable, such that the first position of the first tube relative to the second tube is adjustable via the coupling between the piston and the seal.

2 . The seat post assembly of claim 1 , further comprising an actuator configured to adjust the position of the seal relative to the second distal end of the second tube.

3 . The seat post assembly of claim 2 , wherein the seal is a seal head, the seal head being connected to and positionally fixed relative to the first tube.

4 . The seat post assembly of claim 3 , wherein the actuator includes an endcap configured to at least partially seal the second distal end of the second tube, and
wherein the endcap is rotatable and translatable relative to the second tube via a threaded connection of the endcap to the second tube.

5 . The seat post assembly of claim 4 , wherein the piston includes a piston head and a piston shaft,
wherein the piston shaft extends through the seal head and connects the piston head to the endcap, such that the endcap and the piston head are on opposite sides of the seal head, and wherein the endcap and the piston head are configured to rotate and translate together.

6 . The seat post assembly of claim 5 , wherein the piston is coupled to the seal when the first tube is in the first position relative to the second tube via contact between a surface of the piston head and a surface of the seal head, or
wherein the seat post assembly further comprises a bumper disposed between the piston head and the seal head, and the piston is coupled to the seal when the first tube is in the first position relative to the second tube via the bumper, such that the seal head and the piston head are in contact with opposite sides of the bumper, respectively.

7 . The seat post assembly of claim 6 , wherein when the first tube is in the first position relative to the second tube, the endcap and the piston are rotatable relative to the second tube via the threaded connection in a first rotational direction, such that the endcap and the piston translate in a first translational direction and, via the coupling of the piston to the seal, the seal and the first distal end of the first tube translate towards the second distal end of the second tube, and
wherein the translation of the first distal end of the first tube towards the second distal end of the second tube adjusts the first position of the first tube relative to the second tube, such that the maximum distance between the first distal end of the first tube and the second distal end of the second tube decreases.

8 . The seat post assembly of claim 7 , wherein when the first tube is in the first position relative to the second tube, the endcap and the piston are rotatable relative to the second tube via the threaded connection in a second rotational direction, such that the endcap and the piston translate in a second translational direction and, via the coupling of the piston to the seal, the seal and the first distal end of the first tube are allowed to translate away from the second distal end of the second tube, the second rotational direction being opposite the first rotational direction and the second translational direction being opposite the first translational direction, and
wherein the translation of the first distal end of the first tube away from the second distal end of the second tube adjusts the first position of the first tube relative to the second tube, such that the maximum distance between the first distal end of the first tube and the second distal end of the second tube increases.

9 . The seat post assembly of claim 7 , further comprising:
one or more first anti-rotation features of the first tube; and one or more second anti-rotation features of the second tube, wherein the one or more first anti-rotation features and the one or more second anti-rotation features are configured to interact with each other, respectively, such that the first tube is translatable but not rotatable relative to the second tube.

10 . The seat post assembly of claim 2 , wherein the seal is a seal head, the seal head being rotatable and translatable relative to the second tube via a threaded connection of the seal head to the second tube.

11 . The seat post assembly of claim 10 , further comprising a seatpost head to which a seat is attachable, the seatpost head being configured to at least partially seal the first distal end of the first tube,
wherein the seatpost head is positionally fixed relative to the first tube.

12 . The seat post assembly of claim 11 , wherein the piston includes a piston head and a piston shaft,
wherein the piston shaft extends through the seal head and connects the piston head to the seatpost head, such that the seatpost head and the piston head are on opposite sides of the seal head, and wherein the piston is positionally fixed relative to the first tube and the seatpost head.

13 . The seatpost assembly of claim 12 , wherein the actuator includes a gear supported by the second tube, and
wherein the gear is configured to interact with an outer surface of the seal head, such that rotation of the gear relative to the second tube causes, via the interaction of the gear with the outer surface of the seal head, rotation and translation of the seal head relative to the second tube via the threaded connection.

14 . The seatpost assembly of claim 13 , wherein the outer surface of the seal head includes pinion gear teeth, and the gear is a worm gear configured to interact with the pinion gear teeth of the seal head.

15 . The seatpost assembly of claim 14 , wherein the second tube has an opening through a wall of the second tube, and
wherein the worm gear has a shaft that extends through the opening through the wall of the second tube, such that the worm gear is rotatable from outside the second tube.

16 . The seatpost assembly of claim 13 , wherein when the first tube is in the first position relative to the second tube, the gear is rotatable relative to the second tube in a first rotational direction, such that, via the interaction of the gear with the outer surface of the seal head, the seal head translates in a first translational direction relative to the second tube and, via the coupling of the piston to the seal, the first distal end of the first tube translates towards the second distal end of the second tube, and
wherein the translation of the first distal end of the first tube towards the second distal end of the second tube adjusts the first position of the first tub

Assignees

• Sram Llc

Inventors

• Dunlap Charles
• Chambers Rafer

Classifications

• B62J2001/085

  Seat pillars having mechanisms to vary seat height, independently of the cycle frame · CPC title

• B62J1/08 Primary

  Frames for saddles; Connections between saddle frames and seat pillars; Seat pillars (attaching seat pillars to cycle frames B62K19/36) · CPC title

• B62J1/06 Primary

  Saddles capable of parallel motion up and down · CPC title