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Height adjustable device for a retractable tube assembly

  • US 7,104,203 B2
  • Filed: 06/16/2004
  • Issued: 09/12/2006
  • Est. Priority Date: 06/16/2004
  • Status: Expired due to Fees
First Claim
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1. A height adjustable tube assembly comprising:

  • an inner tube (10);

    an outer tube (20) in which the inner tube (10) is retractably inserted;

    a height adjustable device (30) received in the inner tube (10) and including a base (31) which is fixed in the inner tube (10) and two grooves (310, 311) defined in the base (31), two stop plates (32, 33) respectively received in the two grooves (310, 311) and two respective first ends (320, 330) of the two stop plates (32, 33) extending through apertures (11) defined through the inner tube (10) and being in contact with two respective insides of the outer tube (20), a movable member (34) movably connected to the base (31) and including a driving portion (340) which pivots two respective second ends (321, 331) of the two stop plates (32, 33), a cable (35) having a first end (351) thereof fixed to a first end (343) of the movable member (34) so as to pull the movable member (34) in a direction away from the outer tube (20), a resilient member (36) connected between a second end (344) of the movable member (34) and the base (31) so as to pull the movable member (34) in a direction toward the outer tube (20).

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