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Патент USA US3059207

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06L 16, 1962
Original Filed June 7. 1952
United States Patent 0 ’ce
John G. Ruckelshaus, 110 Ponieroy Road, Madison, NJ.
Original application June 7, 1952, Ser. No. 292,367, now
Patent No. 2,917,814, dated Dec. 22, 1959. Divided
and this application July 17, 1959, Ser. No. 827,936
6 Claims. (Cl. 338—143)
This invention relates tov a potentiometer, and to a ‘
Patented Oct. 16, 1962
cylinder 14, and then undercutting as shown to the depth
of the thread. The cylinder may then be glazed and ?red,
after which the undercuts are coated with platinum or
other metal paste up to the thread ends. The cylinders
are then ?red and baked. Next the alloy is then evapo
rated onto the interior of the cylinder 14 making off
the undercut with platinum so that the alloy ?lm contacts
platinum on ?rst and last thread in the cylinder. The
thread is’ cut or reamed to the desired resistance as shown,
method of making the same. More particularly, it re 10 by a Wheatstone bridge or other suitable instrument.
lates to a variable resistor unit in which the value or
Once the desired ohmage has been obtained, the cups 31
resistance is readily adjustable and in which the resistance
and 32, carrying their respective lead wires, 18 and 18a
are forced into the respective undercuts and solder ap
element is a metallic ?lm.
This is a division of my copending application, Serial
plied to the platinum to seal the unit.
While a preferred embodiment of my invention has
No. 292,367 ?led June 7, 1952, now US. Patent No. 15
been illustrated and described, it is to be understood that
2,917,814, dated December 22, 1959.
An object of this invention is to provide a simple, low
modi?cations as to form, arrangements of parts and
cost potentiometer having in?nite resolution, high sta
use of materials may be made without departing from
bility and having a resistance element containing a metal
the spirit and scope of the invention as claimed herein.
I claim:
lic ?lm.
‘One other object of this invention is to provide a multi
1. A variable resistor comprising an insulated tube,
turn potentiometer of in?nite resolution which can be
having metallic terminals ?red onto each end, a helix of
metallic ?lm evaporatively deposited to a uniform thick
easily adjusted along the entire resistance path and hav
ing a metallic ?lm as the resistance element.
ness on the inner wall of said tube and forming inverse
Still another object of the invention is to provide a 25 apices of the helix therein and overlying said terminals, a
slider contacting said metallic ?lm, and means for adjust
miniature, non-wire wound stable potentiometer.
An object of my invention is to provide a metal ?lm
ing said resistor by moving said slider from one end of
resistance unit that is stable and has a lower temperature
the ?lm to the other along the entire resistance path
thereby obtaining in?nite resolution of resistance change
co-e?icient of resistance.
One further object of my invention is to provide a 30 when said slider is so moved and means of connecting
resistor comprising an insulating tube whose interior is
at least one end of the resistance element.
coated with a metalliferous surface and has terminal con
2. A variable resistor comprising an insulating tube,
metallic terminal bands ?red on the ends of said tube and
ductors at the ends thereof.
Other objects and features of my invention will become
interfused therewith, a metallic ?lm in the form of a helix
apparent from the following‘ detailed description, taken in 35 deposited on the inner wall of the tube and extending
connection with the accompanying drawings, in which the
from one terminal band to the other and overlaying at
FIGURE is a detailed sectional view of a potentiometer
least a portion of each band, said ?lm forming inverse
forming a preferred embodiment of the invention.
apices of the helix therein, a shaft extending from one
In order to manufacture a resistor with high resistance
end of the tube to the other, means for supporting said
values for use as ?lm resisors of this type, the helix 40 shaft axially within said tube, sliding contact means on
employed, as shown in the drawing may be made in the
said tube, terminal means for said sliding contact, and
form of a thread cut on the inside wall 17 of the cylin
means effective upon rotation of the shaft to cause the
der 14. After evaporation of a metal thereon the surface
sliding contact to move angularly along the length of the
of the thread can be cut or reamed and the helix of re
helix, so that resistance between either end terminal and
sistance material will result. Instead of accurately evapo 45 the sliding terminal may be varied as the shaft is rotated.
rating the metal, metal can be deposited to a value lower
3. A resistor according to claim 2 wherein the tube is
than required, then, by connecting the unit across a
selected from the group consisting of glass, ceramic, and
Wheatstone bridge or similar apparatus, careful adjust
glazed ceramic.
ment of the unit can be made by the amount of material
4. A resistor according to claim 2 where the change
cut or reamed off. This unit can then have lug or wire 50 in resistance is in?nite in resolution as the sliding contact
terminals attached to each end and sealed, or a shaft
carrying a moving contact can be inserted so that the
is moved along the path of the helix.
5. A resistor according to claim 2 wherein the ends
unit can be used as a potentiometer or rheostat. Said
of said resistor are sealed.
cylinder 14 is made of any dielectric material such as
6. A resistor according to claim 2 wherein the inner
ceramic, glazed ceramic glass tube or other suitable ma 55 wall of said tube is in the form of a thread said metallic
terial. The inner surface 27 has a thread 28 cut there
?lm being deposited on said thread and comprising an
into and a metal ?lm 29 evaporated thereon as described
alloy of nickel and chromium.
in the above cited application. A shaft 30 is supported
by an insulating bearing 31 and an insulating bearing 32,
References Cited in the ?le of this patent
attached to cylinder 14 at the ends thereof. The shaft 60
30 has a groove 34 running its length. In said groove
34 is a movable contacting member 35 which engages
Pender et al. _________ __ Dec. 10, 1929
the helix coating 29 of alloy evaporated on cylinder 14.
As shaft 30 is turned by means of knurled member 30a
?xed to one end of shaft 30 contact 35 follows the helix 65
coating 29 and slides along groove 34. A ?exible wire
36 connects contact 35 to spring contact terminal 16a
through a metal tip on shaft 30. As shaft 30 is turned,
a variable resistance is thus obtained between terminal
16a and lead 18.
The resistor is made by ?rst threading the interior of
2,547,405 _
Erb ________________ __ Mar. 13, 1945
Mitchell et al. ________ .._ Apr. 3, 1951
Weber et al. _________ __ Feb. 19, 1952
Kohring _____________ _.. May 21, 1957
Kohl _______________ ..- Nov. 11, 1958
Great Britain ________ __ Oct. 27, 1948
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