Patent ID: 7942372
Filing Date: 2011-05-17
Classification: A47B,B43L

Abstract:
1. A multi-functional rack for a whiteboard comprising: a lower adjuster having two lower telescopic tubes respectively disposed on two lateral sides thereof, the lower adjuster having a driving mechanism mounted thereon for providing a lifting effect, the driving mechanism telescopically connected with a lower cross beam, the lower cross beam having two ends simultaneously fixed on the both lower telescopic tubes, a frame fixed on the lower cross beam for adapting to support a whiteboard and being lifted by the driving mechanism; an upper adjuster mounted on a top of the lower adjuster, the upper adjuster having two upper telescopic tubes respectively disposed on two lateral sides thereof, an upper cross beam having two ends simultaneously fixed on an upper part of the both two lower telescopic tubes, a cross beam having two ends simultaneously fixed on both two upper telescopic tubes, an upper sleeve rotatably mounted on the cross beam, a telescopic arm connected to the upper sleeve for adapting to connecting a projector, an adjusting mechanism mounted on the upper adjuster and positioned between the upper cross beam and the cross beam for lifting the cross beam relative to the upper cross beam, the adjusting mechanism including: an adjusting wheel rotatably positioned on the upper cross beam; an inner sleeve longitudinally extending form the adjusting wheel and synchronously rotated with the adjusting wheel; an outer sleeve sleeved on the inner sleeve and connected to the cross beam; a worm gear unrotatably received in the outer sleeve and engaged to the inner sleeve; and a spindle extending from the worm gear and extending through the cross beam, the upper sleeve unrotatably sleeved on the spindle; wherein when the adjusting wheel is rotated and the inner sleeve is synchronously rotated with the adjusting wheel, the inner sleeve rotatably engaging to the worm gear for relatively driving the worm gear, the worm gear longitudinally moved relative to the inner sleeve for adjusting the height of the projector fixed on the telescopic arm connected to the upper sleeve; wherein the frame is lifted by the driving mechanism for adjusting a height of the whiteboard supported by the frame; a height of the telescopic arm is adjustable due to the cross beam and the outer sleeve are lifted by the adjusting mechanism relative to the upper cross beam; a length of the telescopic arm is adjustable for adapting to adjust a distance between the projector and the whiteboard; the telescopic arm is pivotable due to the upper sleeve is synchronously rotated with the telescopic arm such that an angle of the projector is adjustable.