Patent ID: 7735925
Filing Date: 2010-06-15
Classification: A47C

Abstract:
1. A positioning device for a chair comprising, in combination: a clamping seat including first and second clamping members pivotably connected together, with each of the first and second clamping members including first and second side spaced in a longitudinal direction, with the second side of the first clamping member including a first clamping portion, with the first side of the second clamping member including a second clamping portion facing the first clamping portion, with the first and second clamping portions of the first and second clamping members being adapted to be mounted around a fixed rod of a chair, with the first clamping member further including a first through-hole extending from the first side through the second side of the first clamping member, with the second clamping member further including a second through-hole extending from the first side through the second side of the second clamping member, with a spring mounted between the first and second clamping members to bias the first and second clamping portions to an open state not clamped on the fixed rod, allowing movement of the clamping seat along the fixed rod, with the first side of the first clamping member further including a first sidewall spaced from the first clamping portion in a width direction perpendicular to the longitudinal direction, with the first sidewall including a first hole slideably receiving the fixed rod, with the first side of the first clamping member further including a coupling portion adapted to be fixed to an inclinable seat of the chair that is movable relative to the fixed rod; a positioning block mounted to the second clamping member and including first and second sides spaced in the longitudinal direction, with the positioning block further including a third through-hole extending from the first side of the positioning block through the second side of the positioning block and aligned with the second through-hole of the second clamping member, with the second side of the positioning block including a protrusion; an adjusting rod including a coupling seat and a handle fixed to the coupling seat to move therewith, with the coupling seat including first and second sides spaced in the longitudinal direction and a fourth through-hole extending from the first side of the coupling seat through the second side of the coupling seat, with the first side of the coupling seat including a positioning groove having a low-profile section, a high-profile section, and a transition section between the low-profile section and the high-profile section, with the handle pivotable between a release position and a clamping position; and a first coupling rod extending through the first, second, third, and fourth through-holes, with the protrusion of the positioning block received in the positioning groove of the coupling seat and engaged with one of the low-profile section and the high-profile section, wherein when the handle is in the release position, the protrusion of the positioning block is engaged with the low-profile section, and the first and second clamping members are in an open state under the action of the spring, so that the first and second clamping portions of the first and second clamping members are not clamped on the fixed rod, allowing movement of the clamping seat along the fixed rod and allowing movement of the inclinable seat relative to the fixed rod, and wherein when the handle is in the clamping position, the protrusion of the positioning block is engaged with the high-profile section, and the first and second clamping members are in a clamping state, so that the first and second clamping portions of the first and second clamping members are clamped on the fixed rod, not allowing movement of the clamping seat along the fixed rod and not allowing movement of the inclinable seat relative to the fixed rod.