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Adjustable handlebar stem using a locking pin system

  • US 5,887,490 A
  • Filed: 02/27/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 02/28/1996
  • Status: Expired due to Fees
First Claim
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1. An adjustable handlebar stem apparatus for adjusting the position of handlebars, said apparatus comprising:

  • a base member, the base member having a first pivot point and a second pivot point;

    an upper link pivotally attached to the base member, the upper link having a first end and a second end, the first end being attached to the first pivot point of the base member, the upper link having a tracking slot formed therein with side portions on either side of the tracking slot;

    a lower link pivotally attached to the base member, the lower link having first end and a second end, the first end being attached to the second pivot point of the base member, the lower link having a protrusion formed thereon and extending into the tracking slot of the upper link;

    an intermediate member pivotally attached to the upper link and the lower link, the intermediate member having a first pivot point and a second pivot point, the first pivot point of the intermediate member being attached to the second end of the upper link and the second pivot point of the intermediate member being attached to the second end of the lower link; and

    a locking means for locking the upper link and the lower link in a fixed, stable position with respect to the base member and the intermediate member, the locking means comprising a plurality of indexing holes formed in the protrusion of the lower link, and a locking pin movably disposed in a bore formed in the upper link and including means for retractably engaging one of the plurality of indexing holes, the locking means providing i) a locked position when the locking pin engages one of the plurality of indexing holes and ii) an unlocked position when retracted from the hole, the locking pin extending through one of the indexing holes on the protrusion of the lower link and into both side portions of the upper link when in the locked position.

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