Bicycle seat post clamp mechanism

In a bicycle having a frame including a seat tube, a second tube connected to the rear upper end portion of the seat tube, a seat post telescopically mounted for up and down adjustable movement in the seat tube, improved seat post clamp mechanism comprising:

• (a) a locking shoe supported in the second tube for movement to and from a locking position engaging the seat post;
• (b) a pair of clamp members supported in said second tube and aligned for movement relative to one another and to the locking shoe along an axis transverse to the seat post, said clamp members being supported within diametrically opposed openings in the wall of the second tube to thereby absorb clamping reactive forces in a direction tangential to that wall;
• (c) mutually engageable camming surfaces on the clamp members and on the locking shoe for moving the locking shoe into its locking position in response to relative movement of the clamp members;
• and
• (d) adjustment means for effecting relative movement of the clamp members to selectively engage and disengage the camming surfaces on the clamp members and the locking shoe.