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Патент USA US2116097

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May 3, 1938.
Filed July 25, 1936
, m
Jogyn E. CARLSON 7
PatentedMay 3, 1938
Carlson, Electric
Conn, assignor
pany, Plainville, 601131., a corporation or Coin
Application 'July 25, 1936, Serial No. cases
(Cl. 200-122)
4 Claims.
My invention relates to devices of the general
character set forth in the‘ Getchell Patent
1,681,851 used for protecting electrical circuits.
This particular invention is directed to a device
, especially intended for use in an independent coil
circuit or other system in which a secondary
screw so that it may be adjusted with respect to
the resilient switch arm it.
~ Inside of the insulating body or holder is a
bimetallic thermostatic arm 21 which has one
end secured to the upper part of the insulating 5
body by a screw 22. The other end of the there
circuit is opened and closed by changes taking -mostatic member 25 is connected to the switch
member l8 by an insulating piece 23 which has
place in a main motor circuit.
One object is to provide a switch which is not ' a slot 24 through which the member 58 extends.
A strip 25 of thermai insulating materiai such 10
10 only automatically opened upon a certain over
load in the main circuit but which is automati
as asbestos is prefers. y interposed between the
cally reset when conditions are returned to nor
mal in the main circuit.
One object is to provide a device of this char
heater strip H and. t. c 'i‘ermostatic strip ‘1'20.
When an overload. or ‘s
the main circuit
moved from terminal clips of the main and sec
the resistance of the strip 56 causes it to become
heated and this increase in temperature warps is
the thermostatic strip 28 which pulls the insulat
ondary circuits.
ing member 23 so as to retract the switch mem»
‘ l5 acter which can be readily inserted into and re
1 One object is to provide a construction of the
foregoing character involving a thermostatic
20 actuator for the switch in the secondary circuit
circuit but also closes the secondary circuit when
the overload is removed.
[9 of the secondary switch.
circuit upon an overload condition in the main
Fig. 1_is a plan view of one form of relay em
bodying my invention.
I claim:
Fig. 2 is a longitudinal sectional view of the
Fig. 3 is a transverse sectional view on the
F30 plane of the line 3—3 of Fig. 2.
Fig. 4 is an exploded perspective view of cer
tain elements of the construction.
The active parts of the device are enclosed
within a body or housing formed of two parts ‘I
36 and 8 formed of insulating material and held
together by cylindrical caps 9 and III which form
the main terminals of the relay and are adapted
to fit into the usual clips or other mounting ter
minals (not shown). Enclosed within the in
40 sulating body is a heater strip II, the ends of
which are ‘suitably connected to the terminal
caps 9 and I! so that this heater strip constitutes
a part of the main conducting circuit of the sys
conditions ‘in the main circuit are such as to 243
permit the heater strip II to cool off, the ther
mostatic strip 2| resumes its normal position and
closes the circuit through the members l8 and
which actuator not only opens the secondary
ber I8 from the stationary contact l9 and open
the secondary or independent circuit. When the
The terminals l4 and 15 of the secondary cir
cuit switch are secured to an extension of the
insulating body bymmembers l6 and I1 respec
tively and are adapted to engage terminal clips
50 of suitable form (not shown).
The secondary s'witeh consists of a resilient
switch member l8 and a relatively stationary but
adjustable contact ill. The switch member I8 is
secured to the member IT by a screw 20 and the
55 contact I9 is also preferably in theform of a
1. An automatic relay including an insulating
housing, a heater strip within the housing having
main terminals, a bimetallic thermostatic mem
ber vunder the in?uence, of the heater strip, a
secondary circuit switch carried by the housing 30
and having external terminals independent of
the terminals of the heater strip, and insulating
means of connection between the secondary
switch and the thermostatic member, whereby
said bimetallic member is independent of the 35
secondary circuit.
2. In a relay, ant insulating housing having
cylindrical ends and an extension between the
ends projecting laterally from one side of the
housing, main terminal caps on ‘the ends, a re- 40
sistance heater electrically connecting said caps
within the housing, independent circuit ter
minals adjacent opposite ends of the lateral ex
tension, a switch having contacts within said
extension electrically connected to the respec- 45
tive independent circuit terminals and means
actuated by an overload in the circuit through
the heater for opening the circuit through said
3. In a relay, an insulating housing having 50
cylindrical ends and an extension between the
ends projecting laterally from one side of the
housing, main terminal caps on the ends, a re
sistance heater electrically connecting said caps
within the housing, independent circuit ter- '56
2,1 1&097
minals adjacent opposite ends of the extension,
a switch having contacts within said extension
electrically connected to the respective independ
main circuit terminals, 9. bimetallic strip within
said housing under the in?uence of the heater.
a pair of spaced secondary circuit terminals on
ent circuit terminals and means for opening and
said extension, a stationary contact member car
closing the circuit through the switch upon in
ried by each of said secondary circuit terminals.
crease and decrease respectively or the load in ' a ?exible switch member connecting the sec
the main circuit, said means including a bi
ondary circuit contact members and an insulating
metallic strip under the influence of said heater
strip extending laterally from the bimetallic strip
for ?exing the secondary switch member for
opening and closing the secondary circuit, said 10
secondary circuit terminals, stationary contacts
and flexible switch member being supported by
but carrying no current and an insulating piece
10 operatively connecting said bimetallic strip and
4. An automatic relay including a housing, a
lateral extension on the housing centrally there=
oi, a main circuit terminal at each end of the
W housing, a heater in the housing connecting; the
an outer wall of the extension. .
JOHN E. cAaLsoN.
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