Patent ID: 7025522

Claim:
An adjustable bicycle seat post assembly, comprising: an outer seat tube having an open upper end and an opposite lower end insertable into a seat post receptacle of a bicycle frame; an inner seat post having a lower end telescopically received in said open upper end of said outer seat tube and an opposite upper end adapted to mount a bicycle seat; a spring housed within said outer seat tube and acting with a constant spring force between said outer seat tube and said inner seat post to constantly bias said inner seat tube axially outwardly of said outer seat tube toward a fully extended position; a latch member carried by said outer seat tube and moveable between latched and unlatched positions; said latch member being engagable with said inner seat post when in said latched condition for selectively locking said inner seat post in a selected one of at least two positions of adjustment relative to said outer seat tube; and a magnetic switch operative to move said latch members; said magnetic switch including a pair of switch magnets of opposite polarity and a switch housing supporting said switch magnets for sliding movement relative to said latch member, and wherein said latch member moves under the influence of changing magnetic field in response to moving said switch magnets.