Patent ID: 7669815
Filing Date: 2010-03-02
Classification: E01F,E04H

Abstract:
1. A dual-release locking system used in conjunction with a sign supporting stand comprising a mast and a plurality of upwardly foldable and radially extending legs pivoted at the bottom of the mast, each leg incorporated with an individual locking system, the locking system comprising: a. a vertical plate member disposed along one side of the leg, a plurality of holes disposed on the plate member; b. a first locking mechanism for engaging the leg to the plate member at various locking positions as the leg is rotated about the pivot, the first locking mechanism also disengaging from the leg at a locking position; comprising a locking pin transversely disposed within the leg such that both ends of the pin protrude out of the leg, the portion of the pin located inside the leg is fitted with a compression spring whereby when the pin is pulled back and released, it regains its original position; in order for the leg to engage the plate member at a desired position, the pin is slightly pulled back, the leg is slightly moved in the desired direction, and the pin is simultaneously released, so that the pin disengages from a locking position, abuts the plate member, and as the leg is rotated in the same direction, the pin automatically engages a hole at which point the leg is locked at the desired position; c. a second locking mechanism for operating the first locking mechanism wherein the leg can be engaged to the plate member at the various locking positions; the second locking mechanism also disengages from the leg at a locking position; the second locking mechanism enabling the pin to be pulled backward, wherein the pin can disengage from one locking position and engage at another as the leg is rotated; and d. wherein the second locking mechanism comprises: