Elevating device for adjusting a telescopic tube used to support a musical instrument

Claim 1

An elevating device in combination with a telescopic tube, the telescopic tube comprising a lower tube and an upper tube extendable into the lower tube and having a rack formed on a periphery of the upper tube, the elevating device comprising: a casing with an upper opening defined to allow the upper tube to extend into the casing and a lower opening defined to communicate with the upper opening and allow the lower tube to extend into the casing; a worm gear rotatably received in the casing to mesh the rack of the upper tube; and a worm shaft extending into the casing to mesh the worm gear so as to drive the movement of the upper tube relative to the lower tube; and, a handle mounted to connect to the worm shaft to displace the upper tube relative to the lower tube responsive to rotation of the handle; and, an adjusting knob with a positioning block securely attached to a distal end of the adjusting knob to detachably abut an outer periphery of the upper tube for positioning the upper tube relative to the lower tube.