Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1984-09-07
1986-12-09
Frankfort, Charles
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374190, 374194, G01K 520
Patent
active
046277412
ABSTRACT:
The invention refers to a maximum-minimum thermometer (1) with a base plate (2) having arranged thereon temperature scales 3,4, with an extension medium, a mercury filament (10) and magnetically attractable display pins (11,12) contained in a U-shaped capillary tube 5, with permanently magnetized strips (13,14) parallel to the two legs (6,7) of capillary tube (5) for the temporary fixing of the display pins (11,12) showing the max/min. temperatures, while said pins can be returned by magnet (33) moving past the capillary tube (5) outside it to their base position, wherein the strips (13,14) are disposed on the front or rear of the base plate (2) behind the two legs (6,7) of capillary tube (5) or are disposed laterally therefrom and secured there, and in that on base plate (2) a slide element (9) is movably disposed to move along the two legs (6,7) of capillary tube (5) and along said temperature scales (3,4) and overlapping them, on which at least one permanent magnet (33) is invisibly disposed with magnetic force exceeding that of the strips (13,14), by which the two display pins (11,12) can be returned simultaneously due to the corresponding motion of the slide element (9) from their extreme positions to the startline on the ends of the mercury filament (10).
REFERENCES:
patent: 498651 (1893-05-01), Hicks
patent: 2289717 (1942-07-01), Montgomery
patent: 2299284 (1942-10-01), Steidman
patent: 2370968 (1945-03-01), Kahl
patent: 2930234 (1960-03-01), Harada
patent: 3054293 (1962-09-01), Friedrichs
patent: 3522655 (1970-08-01), Kilpatrick et al.
Frankfort Charles
Will Thomas B.
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