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Патент USA US2113326

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April 5, 1938.
p. F. KRO@- ’
Filed July 25, 1935
A Harney
Patented Apr. 5, 1938
Peter F. Krog, Rochester, N. Y.
Application July 25, 1935, Serial No. 33,140
1 Claim. (Cl. 20o-141)
This inventionrrelates to a thermostatic or heat
operated switch, the general object oí the inven
tion being to provide a heat operated switch of
superior simplicity and ruggedness, which is
5 readily adjustable to operate at different tem
Other important objects of my invention will be
apparent from a reading of the following de
scription in connection with the drawing, where
10 in for purposes of illustration I have shown a
preferred embodiment of my invention.
In the drawing:
Figure 1 is a transverse vertical sectional view
taken through the thermostatic device.
Fig. 2 is a side elevational view of Figure 1
taken from the left thereof.
As shown in the drawing, the switch 22 com
prises the tubular metallic part 24 which has a
relatively reduced bore 26, the lower end leading
into one side of the upper part of a cylindrical
chamber 2l which is arranged with its axls hori
zontal. The chamber 2l is formed in a sectional
block composed of the upper section 28 integral
with the tube 24 and the lower separable section
29 which is assembled to the upper section by
means of bolts 30 which traverse the side walls
of the chamber as indicated in Figure 2. The
tube 24` is conveniently arranged through an
opening in a support 3l.
A binding post screw 32 traverses the side of
the tube 24 below the enlarged bore portion 35
and is in contact with the mercury 33 which fills
the interior of the chamber 21 and the tube 24.
The binding post 32 is provided for convenient
» connection with the regular house current.
Inserted into the enlarged bore portion 2l is the
vitreous insulating material tube 34 preferably of
glass or the like and this is held in place by a cap
35 which is threaded on the exterior of the upper
40 end of the tube 24 and contains a packing 36.
On the upper end of the insulating tube 34 is
telescoped a dielectric block 3l in which is axially
mounted a bushing 38 which is both exteriorly
and interiorly threaded, exteriorly to receive the
45 binding post nuts 39 and interiorly to receive
the electrode 40 which is', by virtue of this ar
rangement vertically adjustable in the bushing 38.
It is obvious that by adjusting the electrode 40,
the height to which the mercury 33 must rise to
make contact with the lower end of the electrode
40 is predetermined, and by this arrangement,
the switch is adjustable to operate at a consider
able range of temperatures. For convenience
gauge markings 4I on the exterior oi the trans
lucent dielectric tube 34 are placed at vertical
intervals and designate degrees of temperature
and at the same time the height to which the
mercury will rise at a corresponding temperature 10
to engage the lower end of the electrode 40. The
mercury is clearly visible so that its height may
be compared with the various gauge markings.
Although I have shown and described herein
a preferred embodiment of my invention, it is to 15
be deñnitely understood that I do not desire to
limit the application oi the invention thereto,
and any change or changes may be made in the
materials, and in the structure and arrangement
of the parts, within the spirit of the invention 20
and the scope of the subjoined claim.
What is claimed is:
A mercury switch comprising a casing formed
of upper and lower sections detachably con
nected together and forming a horizontally ar~ 25
ranged cylindrical chamber, a vertically arranged
tubular part connected with the upper section and
having the lower end of its bore entering the
chamber at one side and below the top thereof,
the upper part of the bore of the tubular part
being enlarged, a transparent tube having its
lower end ñtting in the enlarged part of said bore,
packing means for holding said end of the trans
parent tube in position, a block of non-conducting
material fitting over the upper end of the trans
parent tube, a metal sleeve having its lower part
`fitting in the block and contacting the upper end
of the transparent tube, the sleeve being inter~
nally threaded, a rod having a threaded part
passing through the sleeve, with its lower part lo
cated in the transparent tube, the upper part of
the sleeve being exteriorly threaded, nuts on said
threaded part, and a contact member carried by
the tubular part of the casing and contacting the
mercury in the reduced part of the bore of said ¿5
tubular part, and a scale formed on the trans~
parent tube.
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