Liquid heating vessels
AssigneeStrix Limited
InventorsMichael James Scott, Iain Fenna, Alan Michael George Meeks
Life of this patent
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Abstract
A liquid heating vessel comprising heating means for heating liquid in the vessel, electronic control means, electromagnetic switching means for interrupting or reducing power to the heating means, and temperature sensing means for providing a signal dependent on the temperature of liquid in the vessel to the control means. The control means is arranged to operate the electromagnetic switching means to interrupt or reduce power to the heating means in response to the control means determining that a pre-determined temperature condition has been reached.
Claims33
A liquid heating vessel comprising a heater for heating liquid in the vessel provided on the underside of the base of the vessel, an electronic control, an electromagnetic switch for interrupting or reducing power to the heater, and a temperature sensor for providing a signal dependent on the temperature of liquid in the vessel to the control, the control being arranged to operate the electromagnetic switch to interrupt or reduce power to the heater in response to the control determining that a pre-determined temperature condition has been reached, wherein said electromagnetic switch comprises a pair of contacts configured to be normally open, and a coil arranged to hold the contacts in a closed position, after initial closure, when a predetermined current passes through the coil, and wherein the contacts are arranged to open upon the predetermined current to the coil being interrupted or reduced, and wherein a force produced by the predetermined current passing through the coil is adequate to maintain the contacts closed, but such force is inadequate to re-close the contacts when the predetermined current through the coil is restored.
An assembly for a liquid heating vessel comprising:
- a first heater for heating liquid in the vessel and a second heater of lower power than the first;
- the assembly further comprising a control arrangement including an electromagnetic switch for interrupting or reducing the power to the first heater and comprising a coil for effecting said switching;
- wherein the second heater is connected electrically in series with said coil.
A liquid heating vessel comprising a heater for heating liquid in the vessel provided on the underside of the base of the vessel, an electronic control, an electromagnetic switch for interrupting or reducing power to the heater, and a temperature sensor for providing a signal dependent on the temperature of liquid in the vessel to the control, the control being arranged to operate the electromagnetic switch to interrupt or reduce power to the heater in response to the control determining that a pre-determined temperature condition has been reached, wherein said electromagnetic switch comprises a coil arranged to hold a pair of contacts closed when a predetermined current passes therethrough and wherein the contacts are arranged to open upon the current being interrupted or reduced but wherein the contacts are not re-closed when current through the coil is restored, wherein the base of the vessel is provided with a second, lower power, heater for keeping liquid in the vessel warm, wherein the second heater is connected electrically in series with the electromagnetic switch, wherein the current to or the coil of the electromagnetic switch is controlled by a current regulator responsive to a signal from the electronic control.
An electromagnetic switching arrangement for controlling the supply of electrical power to a heater of a liquid heating vessel, including a switch comprising a pair of contacts configured to be normally open, and a coil arranged to hold the contacts in a closed position, after initial closure, when a predetermined current passes through the coil, and wherein the contacts are arranged to open upon the predetermined current to the coil being interrupted or reduced, and wherein a force produced by the predetermined current passing through the coil is adequate to maintain the contacts closed, but such force is inadequate to re-close the contacts when the predetermined current through the coil is restored.
Dependencies are inferred from the claim text.