Patent ID: 6658205
Filing Date: 2003-12-02
Classification: A01K,H05B

Abstract:
An apparatus for adjusting temperature variation value correction of an aquarium heating tube comprising a glass tube housing an adjusting dock which has a lower end connecting to a heating coil and an upper side coupling with a duct which is extended upwards, the duct housing a screw rod which has an upper end fastened to a rotary rod, the rotary rod running through an upper lid to couple with a rotary knob, the rotary knob being turnable to drive the screw rod to move a movable strip thereby to adjust the distance between a first electric contact located on the movable strip and a second electric contact located on an electrode, the movable strip being connected to the heating coil and being deformed when heated to allow the first electric contact of the movable strip to contact or separate from the second electric contact of the electrode;wherein the rotary rod is formed with a squared cross section coaxially engaged in releasable manner by a round spline hole formed in the rotary knob, the round spline hole having a square accommodating cavity located therein and an inner perimeter portion formed with longitudinal teeth, the squared rotary rod to engaging the inner perimeter portion to be adjustably wedged therein in a preselected angle relative to the rotary knob, whereby the rotary knob is removable from the rotary rod and turnable to a temperature scale to be corrected for insertion again.