초록 ▼

A heater for heating water in an aquarium tank is provided with a thermostat which includes a bimetal strip carrying one contact and another strip carrying another contact. Upon deformation of the bimetal strip in response to temperature changes, the contacts are closed to connect the heater with an

A heater for heating water in an aquarium tank is provided with a thermostat which includes a bimetal strip carrying one contact and another strip carrying another contact. Upon deformation of the bimetal strip in response to temperature changes, the contacts are closed to connect the heater with an electrical supply circuit. The distance between the contacts is initially set by a rotatable cam acting on a curved portion of the bimetal strip. A cylindrical body which supports the cam to rotate the latter is provided with a helical groove in which is engaged an indicator captured in an elongated axial slot formed in a support of the cylindrical body. The support has at least one scale on its surface visible through a glass container of the heater. When the cam is rotated to change the distance between the contacts this change is indicated by the position of the indicator on the scale.

대표청구항 ▼

A heater in combination with a thermostat for use in an aquarium tank, comprising: housing means; heating means accommodated in said housing means; and thermo-regulating means also accommodated in said housing means and electrically connected to said heating means to transmit electric current theret

A heater in combination with a thermostat for use in an aquarium tank, comprising: housing means; heating means accommodated in said housing means; and thermo-regulating means also accommodated in said housing means and electrically connected to said heating means to transmit electric current thereto from a supply circuit, said thermo-regulating means including a bimetal strip carrying a first contact thereon, means carrying a second contact, said bimetal strip deforming in response to temperature changes to thereby open and close the contacts to control the electric current to said heating means, and means for varying an initial position of at least one of said contacts relative to the other of said contacts so as to adjust the initial relative position of said contacts corresponding to a desired working temperature in the aquarium tank, said varying means including an elongated cylindrical body journalled for rotation about its axis of elongation in said housing means, means for selectively rotating said cylindrical body, displacement means operatively interconnected between said cylindrical body and one of said bimetal strip and said carrying means so as to move one of said first and second contacts towards or away from the other of said first and second contacts upon rotation of said cylindrical body by said rotating means, said cylindrical body having a longitudinally extending spiral groove on a peripheral surface thereof, indicator means for indicating a relative position of said contacts, said indicator means including an indicator member movably engaged in said spiral groove, and means for restricting said indicator member to a linear movement along the longitudinal axis of said cylindrical body so that, upon rotation of said cylindrical body, to define a relative position of said contacts, said indicator member being urged by said spiral groove to move linearly along said axis, whereby a position of said indicator member along said cylindrical body will correspond to the relative position of said contacts, said housing means being constructed so that the position of said indicator member along said cylindrical body is visible through said housing means.