US 7,919,731 B2 · Stirring hot plate

Abstract

A stirring hot plate for simultaneously heating and stirring a mixture includes a phase controlled motor that spins magnets which couple to, and thereby spin, a stir bar within the mixture. In addition to spinning the magnets, the motor includes an operational mode in which the motor is rapidly braked thereby quickly spinning down the stir bar. The stirring hot plate also includes a visual indicator to the user that the platform is hot-to-the-touch that is especially effective when the stirring hot plate is not in use.

Claims19

Dependent claims

A hot plate for supporting a vessel holding a substance to be heated, the hot plate comprising:

a plate having a generally horizontal upper surface adapted to support a vessel containing a substance to be heated;
an electrical heating element in a heat transfer relation with the plate;
a control electrically connected to the heating element;
and
a control panel electrically connected to the control and including multiple visual displays comprising a hot plate graphic indicator and a multi-character display operable by the control to provide two independent visual indicators that the plate is hot-to-the-touch in response to a temperature of the plate being greater than a first temperature value, wherein the multi-character display is operable by the control to display a temperature of the plate in response to the control applying power to the heating element, and a first message, represented by characters, indicative of the plate being hot in response to the control removing power from the heating element and a temperature of the plate being greater than the first temperature value.

2 more elements

Dependencies are inferred from the claim text.

Stirring hot plate

Life of this patent

Stirring hot plate

Life of this patent

Abstract

Claims19