Patent ID: 7185868

Claim:
A telescopic display stand comprising: a base ( 10 ) having a bottom plate ( 11 ), and a bottom tube ( 12 ) formed on the bottom plate ( 11 ); a fixed tube ( 20 ) securely received in the bottom tube ( 12 ); a first telescopic tube ( 30 ) telescopically received in the fixed tube ( 20 ); a second telescopic tube ( 40 ) telescopically received in the first telescopic tube ( 30 ); a gear box ( 50 ) mounted in the first telescopic tube ( 30 ), the gear box ( 50 ) having a first gear ( 57 ) and a second gear ( 59 ) rotatably mounted in the gear box ( 50 ) and meshed with each other, a threaded hole ( 571 ) defined through the first gear ( 57 ), and a plain hole ( 591 ) defined through the second gear ( 59 ); a plug ( 41 ) mounted in the second telescopic tube ( 40 ), the plug ( 41 ) having two openings ( 43 ) defined through the plug ( 42 ) respectively aligned with the threaded hole ( 571 ) and the plain hole ( 591 ); a first threaded rod ( 14 ) having a bottom end rotatably received in the fixed tube ( 20 ), and threadingly extending through the threaded hole ( 571 ) of the first gear ( 57 ); a second threaded rod ( 33 ) having a bottom end secured in the second gear ( 59 ) and extending through one of the openings ( 43 ); a threading member ( 431 ) engaged on the second threaded rod ( 33 ) and securely received in the opening ( 43 ) in which the second threaded rod ( 33 ) extends; and a driving unit mounted on the gear box ( 50 ) being connected to the first gear ( 57 ) having a motor ( 54 ) with an output axle extending in the gear box ( 50 ), a first pulley ( 541 ) mounted on the output axle, a shaft ( 521 ) rotatably mounted in the gear box ( 50 ), a second pulley ( 523 ) mounted on the shaft ( 521 ) and connected to the first pulley ( 541 ) by a belt ( 542 ), and a pinion ( 522 ) mounted on the shaft ( 521 ) and engaged with the first gear ( 57 ).