Patent ID: 8109687
Filing Date: 2012-02-07
Classification: F16B,Y10T

Abstract:
1. A telescopic adjusting mechanism comprising: an outer tube comprising a tube wall provided with a pair of opposing positioning holes, and having opposite first and second ends along a longitudinal axis; an inner tube extended into said outer tube via said first end, comprising a tube wall formed with a pair of opposing first holes, and displaceable relative to said outer tube along the longitudinal axis; a locking unit disposed in said inner tube, displaceable relative to said outer tube along with said inner tube, and comprising a pair of opposing locking members and a first biasing member disposed between said locking members, said biasing member biasing said locking members outwardly along a transverse axis perpendicular to the longitudinal axis to a locking position wherein said locking members extend through said first holes in said inner tube to engage said positioning holes of said outer tube such that said inner tube is disposed at an extended position relative to said outer tube; each said locking member being formed with an engaging indentation, said locking members being contractible to an unlocking position wherein said locking members are disengaged from said positioning holes and said indentations are aligned to form an engaging hole; a restraining member disposed in said inner tube, displaceably received within said engaging hole, said restraining member in an engaging position engaging said indentations to maintain said locking members in the unlocking position to allow said inner tube to be retracted within said outer tube, said restraining member being releasable from said engaging position responsive to contact with a releasing member disposed within said outer tube when said inner tube is fully retracted within said outer tube; wherein said locking members are further movable to an intermediate position between the locking position and the unlocking position, said locking members being disengaged from said positioning holes of said outer tube and said indentations being offset such that said restraining member is unable to engage said indentations when said locking members are disposed at the intermediate position; and a drive unit comprising a pair of opposing drive members and a second biasing member disposed between said drive members, said second biasing member biasing said drive members outwardly along a transverse axis wherein said locking unit is contractible responsive to expansion of said drive unit, each said drive unit comprising a pull member for pulling said locking members by a first contact portion of each said locking member to move from the intermediate position to the unlocking position, said drive unit being operable to move said locking members from the locking position to the unlocking position against biasing action of said first biasing member.