Oven Thermometer: Door-Mounted Dial with a Curved Bimetal Strip (Whittier, US 1,498,413, 1924)

A dial thermometer that fits in an oven door or wall. Behind an enamelled dial plate, a curved bimetal strip runs from a fixed stud to a little arm on a spindle; as the oven heats, the strip bends, turns the spindle and swings the pointer across the scale on the front. Everything is mounted on the dial plate as one unit and dropped into a shallow stamped case with a glass cap. Result: a compact oven thermometer, easy to calibrate and adjust. Source: H. R. Whittier, US 1,498,413 (1924). Unknown: metals, sizes and the scale unit. Picture: the patent drawing.

متوسط

Unknown

التعليمات

Make the dial unit

Cut a metal disk for the dial plate, enamel its front and mark the scale (the patent's drawing reads 200 to 500). Thread a sleeve through the plate near one edge and pass a spindle loosely through it, with a pointer fixed on its front end and a short arm on its back end. Set a stud through the plate: in front it stops the pointer, behind it anchors one end of a curved bimetal strip whose other end is pinned to the arm. Not given: metals, sizes, the scale unit.

المواد لهذه الخطوة:

معدن غير معروف1 dial plate, sleeve, spindle, pointer, arm, stud

مادة غير معروفة1 enamel and scale

شريط ثنائي المعدن1 curved strip

الأدوات المطلوبة:

طقم أدوات قطع اللولب

زرادية مستديرة الفك

أبعاد غير معروفة

Make the case

Stamp a shallow case from thin sheet metal, closed at the back, with perforated ears for fixing it in the oven door or wall, and press lugs in from its wall for the dial plate to sit on. Make a cap with a glass to close the open front. Ours: steel sheet and a watch glass.

المواد لهذه الخطوة:

لوح فولاذ طري1 case and cap

زجاجة ساعة1 window

الأدوات المطلوبة:

مقصّ صفائح

أبعاد غير معروفة

Assemble, calibrate and fit

Calibrate the strip and set the pointer while the unit is out of the case, then drop the dial unit onto the lugs and fit the cap, which holds the plate in place. Fasten the case through its ears in the oven door or wall. As the oven heats, the strip bends and the pointer swings across the scale. Not given: how it is calibrated.

الأدوات المطلوبة: