Patent ID: 8602377

Claim:
A telescopic stand, comprising: an outer tube, an inner tube, a chain, a housing, a driven member, a driving member, and a safety latch; wherein the outer tube has a periphery provided with a guiding slot; the inner tube is movably mounted in the outer tube; the inner tube has a periphery provided with a regulating track aligning with the guiding slot of the outer tube; the chain is secured on the regulating track of the inner tube to move the inner tube relative to the outer tube; the chain is partially exposed from the guiding slot of the outer tube; the housing is secured on the outer tube; the housing has an interior provided with a mounting hole mounted on the outer tube; the housing has two opposite sides each provided with a mounting sleeve for mounting the driven member; the housing has a periphery provided with a journal for mounting the driving member; the driven member is rotatably mounted in the housing and supported by the mounting sleeve of the housing; the driven member has a central portion provided with a protruding shaft rotatably mounted in the mounting sleeve of the housing; the driven member has a first side provided with a chainwheel and a second side provided with a worm gear; the chainwheel of the driven member has a periphery provided with a plurality of engaging teeth and a plurality of arcuate grooves defined between the engaging teeth; the engaging teeth of the chainwheel of the driven member extend through the guiding slot of the outer tube and mesh with the chain; the driving member is rotatably mounted in the housing and supported by the journal of the housing; the driving member has a first end provided with a worm meshing with the worm gear of the driven member; the driving member has a second end provided with a connecting rod connected with a rocking arm; the connecting rod of the driving member has a periphery provided with a collar mounted in the journal of the housing; the safety latch is mounted on the housing and is movable into one of the arcuate grooves defined between the engaging teeth of the chainwheel of the driven member to stop rotation of the driven member.