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Instant-Read Thermometer: Digital, with a Stainless Probe That Pivots on the Case (Cook, US 5,018,875, 1991)
A pocket digital thermometer. A thin stainless steel probe with a thermistor in its tip pivots on a small, flat-sided case, so you can push the probe into food and turn the display to face you. A button cell runs a chip and a liquid crystal display, and a push button updates the reading at once. The angled case will not roll off a table.
Result: a thin-probe digital thermometer for food and air.
Source: T. A. Cook (PSG Industries), US 5,018,875 (1991). Unknown: the circuit, the range, the case size. Picture: the patent drawing.
Kati
Unknown
Maagizo
1
1
Make the probe
Make the probe
Cut a type 304 stainless steel tube about 0.166 in (4.0 mm) across and 5 in (120 mm) long, and close one end. Set a thermistor inside the closed tip and run its two wires up the tube. Aluminium or titanium would also serve.
Vifaa kwa hatua hii:
Bomba la chuma cha pua1 probe
Seti ya thermistor za NTC1 thermistor
Waya wa Shaba1 interconnecting wiresZana zinazohitajika:
Msumeno wa chuma
Chuma cha kulehemia2
2
Mould the pivot boss and case
Mould the pivot boss and case
Mould from ABS a cylindrical pivot boss with a recess for the probe's open end and a channel right through it for the wires. Mould the case in an upper and a lower half that snap together, wider at the display end and tapering to the probe end so it cannot roll, with two projecting supports at the probe end, each with a pivot hole. Not given: the sizes.
Vifaa kwa hatua hii:
Chembechembe za ABS1 boss and caseZana zinazohitajika:
Mashine ya kufinyanga kwa kudunga
Vipimo visivyojulikana3
3
Fit the electronics and assemble
Fit the electronics and assemble
In the case, fit an integrated circuit that turns the thermistor's resistance into a reading on a liquid crystal display at the wide end, with a push button beside it that updates the reading at once. Add a compartment for a 1.5 V button cell (Eveready E675, IEC R07) under a cover that locks with a quarter turn. Push the probe into the boss, lead the wires through the channel to the circuit, and clamp the boss ends in the pivot holes as the halves snap together; friction holds whatever angle you set. In use, push the probe in, turn the display to face you and press the button. Not given: the circuit (the patent points to US 4,536,851).
Vifaa kwa hatua hii:
Bamba la mzunguko lililochapishwa1 kipande
Saketi iliyounganishwa1 kipande
Paneli ya LCD ya sehemu1 kipande
Kitufe cha kubonyeza1 kipande
Betri ya kifungo ya volti 1.51 kipande
Waya wa Lehemu1 as neededZana zinazohitajika:
Chuma cha kulehemiaVifaa
10- 1 probeKishikilia Nafasi
- 1 thermistorKishikilia Nafasi
- 1 interconnecting wiresKishikilia Nafasi
- 1 boss and caseKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 as neededKishikilia Nafasi
Zana Zinazohitajika
4- Kishikilia Nafasi
- 2 vendors sell this, none ship to you yetKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Vifaa vya Michoro Iliyounganishwa
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