US3840834A - Protector/indicator using ptc heater and thermostatic bimetal combination - Google Patents
Protector/indicator using ptc heater and thermostatic bimetal combination Download PDFInfo
- Publication number
- US3840834A US3840834A US00316193A US31619372A US3840834A US 3840834 A US3840834 A US 3840834A US 00316193 A US00316193 A US 00316193A US 31619372 A US31619372 A US 31619372A US 3840834 A US3840834 A US 3840834A
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- US
- United States
- Prior art keywords
- indicator
- base member
- latching
- heater
- latching means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H61/00—Electrothermal relays
- H01H61/01—Details
- H01H61/013—Heating arrangements for operating relays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
- H01H71/164—Heating elements
Definitions
- ABSTRACT An indicator and/or protector uses a PTC heater and a bimetallic device in combination.
- As an indicator power is passed through a PTC pill, the pill being thermally coupled to the bimetallic device.
- a spring biased flag which is latched by the bimetallic device becomes unlatched and provides an indicator of this condition.
- the flag must be manually reset.
- a further embodiment includes the bimetallic device as a portion of a switch wherein, when the snapping temperature of the bimetallic device has been reached, the switch can be opened, thereby providing a protection function in addition to the indicator.
- PROTECTOR/INDICATOR USING PTC HEATER AND THERMOSTATIC BIMETAL COMBINATION This invention relates to an indicator and/or protector for use in conjunction with electric circuits and, more specifically to abimetallic element controlled by a PTC pill for unlatching a latched spring biased indicator and/or providing a protection function.
- Manually resettable indicators are desirable in protective circuits having an automatic reset capability so that it can be determined whether an alarm condition was present at any time.
- the manually resettable protection circuit is desirable in conjunction with the indicator so that the location of the alarm condition is readily apparent.
- the above was accomplished by providing a voltage responsive heating element, the heater requiring the use of many turns of relatively fine resistance wire. This wire was not only difficult to handle, but-also lacked physical stability when placed next to a bimetallic element. Devices of this type, though operative, were difficult to manufacture and of relatively high cost. It was also not possible to place a sufficient length of resistance wire within the enclosure to allow full line voltage to be applied across the heater. This necessitated an external ballast resistor of sufficient wattage to dissipate the .excess power.
- the above problems of the prior art are minimized by the use of a PTC heater used in conjunction with a bimetallic ele ment, the bimetallic element providing a latching func tion for a spring biased flag.
- the bimetallic element Upon a predetermined movement of the bimetallic element due to heating by the PTC heater, the latching action ceases and the flag or indicator is biased into its indicating position. The indicator is reset by manually relatching it after the bimetallic element has cooled sufficiently.
- the bimetallic element can also be a portion of a switch wherein sufficient movement of the bimetallic element also opens the switch to provide a protection function.
- FIG. 1 is a view in elevation of the protector/indicator in accordance with the present invention
- FIG. 2 is a top view of the protector/indicator of FIG. 1 with the cover removed in the unlatched condition;
- FIG. 3 is a view taken along the line 3-3 of FIG. 2;
- FIG. 4 is a view taken along the line 44 of FIG. 3;
- FIG. 5 is a view as in FIG. 2 in the latched condition
- FIG. 6 is a view taken along the line 6-6 of FIG. 5;
- FIG. 7 is a circuit diagram of one embodiment of a protector and indicator circuit in accordance with the present invention.
- FIG. 8 is a circuit diagram of a second embodiment of a protector and indicator in-accordance with the present invention.
- FIG. 9 is a circuit diagram of a third embodiment of a protector and indicator in accordance with the present invention.
- a protector and/or indicator having a cover secured to base 3' by means of stakes 5 and 7.
- a plurality of terminals 9, l1 and 13 extend through apertures in the base 3, the terminals then being staked to permanently affix them in the base.
- the terminals 1 l and 13 are utilized for the indicator operation, terminal 9 being used only for the protector function.
- FIGS. 24 there is shown the protector/indicator with the cover I removed, the indicator being in the unlatched state.
- the terminal 11 is coupled to one side of a PTC pill 15, the other side of the PTC pill being coupled to terminal 13.
- a bimetallic blade 17 is bonded to the pill or heater l5 and is thermally coupled thereto.
- the blade can be either of the creep type or snap action type, these being well known in the art.
- a flag '19 is positioned in a groove in the base 1 and is slidable in the groove. The flag is-shown in its extended position in FIGS. 2-4.
- the flag 19 includes a.
- the flag 19 is moved into the extended or alarm position bymeans of a spring 25 positioned in a groove in the base 3 by urginga protrusion 27 depending from the flag 19.
- the flag 19 is held in the groove by means of a finger 20 positioned in a depression 22, the finger 20 being integral with the terminal ll.
- FIGS. 5 and 6 there is shown the protector/indicator in the latched condition.
- the flag 19 When in the latched condition, the flag 19 is pushed inwardly into the base 3 whereupon the finger 23 of blade 17 latches against the dog leg portion 21 of the flag.
- the spring 25 is pushing against the protrusion 27 and the finger 23 is contacting the terminal 9 for use in the protection embodiment of the invention.
- FIG. 7 there is shown a circuit dia gram of one embodiment of a protector/indicator in accordance with the present invention.
- current to a load would flow from A TO C through the bimetal element and some current would flow from A to B through a PTC heater.
- Afthe PTC heater When excessive current is flowing to Afthe PTC heater will cause the bimetal element to curve upwardly and open the circuit from A to C.
- B could be terminal 11
- C could be terminal 9.
- FIG. 8 there is shown a second circuit diagram.
- current to a load flows from terminals D to B through a bimetal element.
- Current to the PTC heater flows in a separate circuit from F to G.
- the heater and bimetal element are electrically but not thermally isolated by insulation placed therebetween.
- FIG. 9 there is shown a third circuit diagram.
- the PTC heater and the bimetal element are connected in series between H and J.
- the bimetal element and PTC heater are thermally coupled.
- the PTC heater not only avoids the limitations of the prior art resistance wire but additionally is more efficient since once it heats up it goes into a high resistance mode where an equilibrium is achieved with the current passing therethrough limited to a trickle.
- An alarm indicator which comprises,
- latching means secured to said base member for normally latching said indicator means in said base member, said latching means being a bimetallic device,
- a PTC heater thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said' heater
- An alarm indicator which comprises,
- a PTC heater thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater
- An alarm indicator which comprises,
- latching means secured to said base member for normally latching said indicator means in said base member, said latching means being a bimetallic device
- a PTC heater thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater
- An alarm indicator comprising:
- thermally responsive latching means disposed on said base member and adapted to prevent said indicating means from extending out of said base member when said latching means is in a latched position
- a PTC heater thermally coupled to said latching means for causing said latching means to unlatch said indicating means responsive to a predetermined condition of said heater
- said latching means comprises a bimetal member having two ends one end of which is electrically connected to one of said terminal means, a stationary contact mounted on the base, the otherend of the bimetal member engageable with said stationary contact when the indicator means is latched.
- An alarm indicator according to claim 5 in which the indicator means includes at least a portion of electrically insulative material which is interposed between the other end of the bimetal member and the stationary contact when the indicator means is unlatched.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermally Actuated Switches (AREA)
Abstract
An indicator and/or protector uses a PTC heater and a bimetallic device in combination. As an indicator, power is passed through a PTC pill, the pill being thermally coupled to the bimetallic device. Upon sufficient transfer of heat from the pill to the bimetallic device, a spring biased flag which is latched by the bimetallic device becomes unlatched and provides an indicator of this condition. The flag must be manually reset. A further embodiment includes the bimetallic device as a portion of a switch wherein, when the snapping temperature of the bimetallic device has been reached, the switch can be opened, thereby providing a protection function in addition to the indicator.
Description
United States Patent [191 Obenhaus et al.
[451 Oct. 8, 1974 a [75] Inventors: Robert E. Obenhaus, South Easton;
David J. Squiers, Bristol, both of Mass. [73] Assignee: Texas Instruments Incorporated,
Dallas, Tex.
[22] Filed: Dec. 18, 1972 21 Appl. No.: 316,193
[52] U.S. Cl. 337/79, 337/77 [51] Int. Cl 337 107, H0111 71/04, I-I0lh 61/02 [58'] Field of Search 337/77, 78, 79, 107, 332, 337/376, 417
[56] References Cited I UNITED STATES PATENTS 2,824,932 2/1958' Ellenberger 337/79 X 3,185,793 7 5/1965 Ellenberger 337/77 3,193,647 7/1965 Beaudoin et al. 337/79X 3,495,150 2/1970 Enemark 337/107 UX 3,496,509 2/1970 M'etcalf 337/77 3,525,914 8/1970 Vind 337/107 UX Primary Examiner-A. T. Grimley Attorney, Agent, orFirm-John A. Haug; James P. McAndrews; Edward -J. Connors, Jr.
[57] ABSTRACT An indicator and/or protector uses a PTC heater and a bimetallic device in combination. As an indicator, power is passed through a PTC pill, the pill being thermally coupled to the bimetallic device. Upon sufficient transfer of heat from the pill to the bimetallic device, a spring biased flag which is latched by the bimetallic device becomes unlatched and provides an indicator of this condition. The flag must be manually reset. A further embodiment includes the bimetallic device as a portion of a switch wherein, when the snapping temperature of the bimetallic device has been reached, the switch can be opened, thereby providing a protection function in addition to the indicator.
7 Claims, 9 Drawing Figures 3.840.834 sum 10: 4
" PATENTEUnm 81974.
PROTECTOR/INDICATOR USING PTC HEATER AND THERMOSTATIC BIMETAL COMBINATION This invention relates to an indicator and/or protector for use in conjunction with electric circuits and, more specifically to abimetallic element controlled by a PTC pill for unlatching a latched spring biased indicator and/or providing a protection function.
In protection circuitry and particularly motor protection circuitry, it is desirable to provide manually resettable indicators and/or protection devices. Manually resettable indicators are desirable in protective circuits having an automatic reset capability so that it can be determined whether an alarm condition was present at any time. The manually resettable protection circuit is desirable in conjunction with the indicator so that the location of the alarm condition is readily apparent. In accordance with one prior art device, the above was accomplished by providing a voltage responsive heating element, the heater requiring the use of many turns of relatively fine resistance wire. This wire was not only difficult to handle, but-also lacked physical stability when placed next to a bimetallic element. Devices of this type, though operative, were difficult to manufacture and of relatively high cost. It was also not possible to place a sufficient length of resistance wire within the enclosure to allow full line voltage to be applied across the heater. This necessitated an external ballast resistor of sufficient wattage to dissipate the .excess power.
Also, fragility of the resistance wire and maintaining of its physical position within the enclosure caused a problem. i
In accordance with the present invention, the above problems of the prior art are minimized by the use of a PTC heater used in conjunction with a bimetallic ele ment, the bimetallic element providing a latching func tion for a spring biased flag. Upon a predetermined movement of the bimetallic element due to heating by the PTC heater, the latching action ceases and the flag or indicator is biased into its indicating position. The indicator is reset by manually relatching it after the bimetallic element has cooled sufficiently. As an alternative embodiment, the bimetallic element can also be a portion of a switch wherein sufficient movement of the bimetallic element also opens the switch to provide a protection function.
It is'therefore an object of this invention to provide an indicator and/or protector for use in protective circuits and the like.
It is still a further objectof this invention to provide a normally latched indicator which is unlatched by a PTC heater controlled bimetallic element.
It is yet a further object of this invention to provide an indicator and/or protector having a heating element which maintains its physical position relative to a bimetallic element.
The aboveobjects and still further objects of the invention will become immediately apparent to those skilled in the art after consideration of the following preferred embodiments thereof, which are provided by way of example and not by way of limitation wherein:
FIG. 1 is a view in elevation of the protector/indicator in accordance with the present invention;
FIG. 2 is a top view of the protector/indicator of FIG. 1 with the cover removed in the unlatched condition;
2 FIG. 3 is a view taken along the line 3-3 of FIG. 2;
FIG. 4 is a view taken along the line 44 of FIG. 3;
FIG. 5 is a view as in FIG. 2 in the latched condition;
FIG. 6 is a view taken along the line 6-6 of FIG. 5;
FIG. 7 is a circuit diagram of one embodiment of a protector and indicator circuit in accordance with the present invention;
FIG. 8 is a circuit diagram of a second embodiment of a protector and indicator in-accordance with the present invention; and
FIG. 9 is a circuit diagram of a third embodiment of a protector and indicator in accordance with the present invention.
Referring now to the figures, there is shown a protector and/or indicator having a cover secured to base 3' by means of stakes 5 and 7. A plurality of terminals 9, l1 and 13 extend through apertures in the base 3, the terminals then being staked to permanently affix them in the base. The terminals 1 l and 13 are utilized for the indicator operation, terminal 9 being used only for the protector function.
Referring now to FIGS. 24, there is shown the protector/indicator with the cover I removed, the indicator being in the unlatched state. The terminal 11 is coupled to one side of a PTC pill 15, the other side of the PTC pill being coupled to terminal 13. A bimetallic blade 17 is bonded to the pill or heater l5 and is thermally coupled thereto. The blade can be either of the creep type or snap action type, these being well known in the art. A flag '19 is positioned in a groove in the base 1 and is slidable in the groove. The flag is-shown in its extended position in FIGS. 2-4. The flag 19 includes a.
Referring now to FIGS. 5 and 6, there is shown the protector/indicator in the latched condition. When in the latched condition, the flag 19 is pushed inwardly into the base 3 whereupon the finger 23 of blade 17 latches against the dog leg portion 21 of the flag. In this condition, the spring 25 is pushing against the protrusion 27 and the finger 23 is contacting the terminal 9 for use in the protection embodiment of the invention.
heats up the bimetallic element.l7 until it either creeps above or snapsabove the dog leg 21, as the case may be. At this time, the latch on the dog leg 21 by the finger 23 is removed and the flag is urged forwardly by the bias on the protrusion 27 by the spring 25. The flag can now only be manually resct. Also, in the protector embodiment, since the dog leg 21 has now moved beneath the finger 23, the finger cannot make contact with terminal 9 without manual reset. It should be noted the creep type element 17 will normally be used when only the indicator function is desired. Otherwise the snap type device would normally be used.
Referring now to FIG. 7, there is shown a circuit dia gram of one embodiment of a protector/indicator in accordance with the present invention. In this embodiment, current to a load would flow from A TO C through the bimetal element and some current would flow from A to B through a PTC heater. When excessive current is flowing to Afthe PTC heater will cause the bimetal element to curve upwardly and open the circuit from A to C. Referring to FIGS. 1-6, A could be terminal 13, B could be terminal 11 and C could be terminal 9.
Referring now to FIG. 8, there is shown a second circuit diagram. Here current to a load flows from terminals D to B through a bimetal element. Current to the PTC heater flows in a separate circuit from F to G. The heater and bimetal element are electrically but not thermally isolated by insulation placed therebetween.
Referring now to FIG. 9, there is shown a third circuit diagram. Here the PTC heater and the bimetal element are connected in series between H and J. In all of the embodiments of FIGS. 7-9, the bimetal element and PTC heater are thermally coupled.
It can be seen that there has been provided a protector and/or indicator which readily accomplishes the objects set forth above.
Though the invention has been described with respect to specific preferred embodiments thereof, many variations and modifications will immediately become apparent to those skilled in the art. It is therefore the intention that the appended claims be interpreted as broadly as possible in view of the prior art to include all such variations and modifications.
The PTC heater not only avoids the limitations of the prior art resistance wire but additionally is more efficient since once it heats up it goes into a high resistance mode where an equilibrium is achieved with the current passing therethrough limited to a trickle.
What is claimed is:
1. An alarm indicator which comprises,
a. a base member,
b. indicator means positioned in said base member biased to extend out of said base member,
0. latching means secured to said base member for normally latching said indicator means in said base member, said latching means being a bimetallic device,
d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said' heater,
e. means to apply current across said heater,
f. a load terminal, and
g. a switch connected in series with said load terminal, said latching means forming a portion of said switch.
2. An alarm indicator which comprises,
a. a base member,
b. indicator means positioned in said base member biased to extend out of said base member,
c. latching means secured to said base member for normally latching said indicator means in said base member,
d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater,
e. means to apply current across said heater, and
f. a load terminal and a switch connected in series with said load terminal, said latching means forming a portion of said switch, said load terminal being electrically isolated from said PTC heater.
3. An alarm indicator which comprises,
a. a base member,
b. indicator means positioned in said base member biased to extend out of said base member,
c. latching means secured to said base member for normally latching said indicator means in said base member, said latching means being a bimetallic device,
d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater,
e. means to apply current across said heater, and
f. a load terminal, and a switch connected in series with said load circuit, said latching means forming a portion of said switch, said switch being electrically isolated from said PTC heater.
4. An alarm indicator comprising:
a base member,
indicator means mounted on said base member for reciprocal motion and biased to extend out of said base member,
a thermally responsive latching means disposed on said base member and adapted to prevent said indicating means from extending out of said base member when said latching means is in a latched position,
a PTC heater thermally coupled to said latching means for causing said latching means to unlatch said indicating means responsive to a predetermined condition of said heater, and
terminal means to apply current across said PTC heater.
5. An alarm indicator according to claim 4 in which said latching means comprises a bimetal member having two ends one end of which is electrically connected to one of said terminal means, a stationary contact mounted on the base, the otherend of the bimetal member engageable with said stationary contact when the indicator means is latched.
6. An alarm indicator according to claim 5 in which the indicator means includes at least a portion of electrically insulative material which is interposed between the other end of the bimetal member and the stationary contact when the indicator means is unlatched.
7. An alarm indicator according to claim 6 in which the PTC heater is electrically isolated from the stationary contact and bimetal member.
Claims (7)
1. An alarm indicator which comprises, a. a base member, b. indicator means positioned in said base member biased to extend out of said base member, c. latching means secured to said base member for normally latching said indicator means in said base member, said latching means being a bimetallic device, d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater, e. means to apply current across said heater, f. a load terminal, and g. a switch connected in series with said load terminal, said latching means forming a portion of said switch.
2. An alarm indicator which comprises, a. a base member, b. indicator means positioned in said base member biased to extend out of said base member, c. latching means secured to said base member for normally latching said indicator means in said base member, d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater, e. means to apply current across said heater, and f. a load terminal and a switch connected in series with said load terminal, said latching means forming a portion of said switch, said load terminal being electrically isolated from said PTC heater.
3. An alarm indicator which comprises, a. a base member, b. indicator means positioned in said base member biased to extend out of said base member, c. latching means secured to said base member for normally latching said indicator means in said base membeR, said latching means being a bimetallic device, d. a PTC heater, thermally coupled to said latching means, for causing said latching means to unlatch said indicator means responsive to a predetermined condition of said heater, e. means to apply current across said heater, and f. a load terminal, and a switch connected in series with said load circuit, said latching means forming a portion of said switch, said switch being electrically isolated from said PTC heater.
4. An alarm indicator comprising: a base member, indicator means mounted on said base member for reciprocal motion and biased to extend out of said base member, a thermally responsive latching means disposed on said base member and adapted to prevent said indicating means from extending out of said base member when said latching means is in a latched position, a PTC heater thermally coupled to said latching means for causing said latching means to unlatch said indicating means responsive to a predetermined condition of said heater, and terminal means to apply current across said PTC heater.
5. An alarm indicator according to claim 4 in which said latching means comprises a bimetal member having two ends one end of which is electrically connected to one of said terminal means, a stationary contact mounted on the base, the other end of the bimetal member engageable with said stationary contact when the indicator means is latched.
6. An alarm indicator according to claim 5 in which the indicator means includes at least a portion of electrically insulative material which is interposed between the other end of the bimetal member and the stationary contact when the indicator means is unlatched.
7. An alarm indicator according to claim 6 in which the PTC heater is electrically isolated from the stationary contact and bimetal member.
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US00316193A US3840834A (en) | 1972-12-18 | 1972-12-18 | Protector/indicator using ptc heater and thermostatic bimetal combination |
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US00316193A US3840834A (en) | 1972-12-18 | 1972-12-18 | Protector/indicator using ptc heater and thermostatic bimetal combination |
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US00316193A Expired - Lifetime US3840834A (en) | 1972-12-18 | 1972-12-18 | Protector/indicator using ptc heater and thermostatic bimetal combination |
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US4037316A (en) * | 1974-09-23 | 1977-07-26 | General Electric Company | Method of assembling temperature responsive resistance member |
US4038627A (en) * | 1975-04-14 | 1977-07-26 | Johnson Brant T | Electro-thermal isolating switch |
US4044348A (en) * | 1975-09-22 | 1977-08-23 | Gould Inc. | Circuit energization indicator with thermal timing means to maintain the indication for a predetermined time after de-energization |
US4306210A (en) * | 1977-12-31 | 1981-12-15 | Behr-Thomson Dehnstoffregler Gmbh | Two-stage temperature switch |
US4310837A (en) * | 1980-10-14 | 1982-01-12 | General Electric Company | Electrical device termination high temperature indicator |
US4412266A (en) * | 1980-07-02 | 1983-10-25 | Yamada Electric Manufacturing Company Ltd. | AC Electrical device protective thermal relay |
US4720759A (en) * | 1986-05-15 | 1988-01-19 | Tobu Electric Co., Ltd. | Compact protector utilizing a bimetal and an excessive rise prevention portion |
US5048974A (en) * | 1988-05-09 | 1991-09-17 | Jaeger | Temperature measuring device including an alarm contact |
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US5854585A (en) * | 1997-04-10 | 1998-12-29 | Texas Instruments Incorporated | Manual reset electrical equipment protector apparatus |
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US20040047100A1 (en) * | 2000-10-04 | 2004-03-11 | Honeywell International, Inc. | Thermal switch containing preflight test feature and fault location detection |
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US20050174211A1 (en) * | 2002-06-11 | 2005-08-11 | Hideaki Takeda | Direct current cutoff switch |
US20060109074A1 (en) * | 2004-11-23 | 2006-05-25 | Yim-Shu Lee | Resetable over-current and/or over-temperature protection system |
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US20110140827A1 (en) * | 2008-04-18 | 2011-06-16 | Katsuaki Suzuki | Circuit protection device |
US20120001721A1 (en) * | 2009-03-12 | 2012-01-05 | Uchiya Thermostat Co., Ltd. | Thermal switch |
US20120032773A1 (en) * | 2009-03-12 | 2012-02-09 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US8854784B2 (en) | 2010-10-29 | 2014-10-07 | Tyco Electronics Corporation | Integrated FET and reflowable thermal fuse switch device |
US20150022311A1 (en) * | 2010-12-16 | 2015-01-22 | Tyco Electronics Japan G.K. | Protective Device |
US8958196B2 (en) | 2009-11-04 | 2015-02-17 | Uchiya Thermostat Co., Ltd. | Electric circuit connected to thermal switch with three terminals |
US9472363B2 (en) | 2009-03-12 | 2016-10-18 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20170179462A1 (en) | 2015-12-18 | 2017-06-22 | Bourns, Inc. | Battery housing |
US10985552B2 (en) | 2018-06-22 | 2021-04-20 | Bourns, Inc. | Circuit breakers |
US11651922B2 (en) | 2019-08-27 | 2023-05-16 | Bourns, Inc. | Connector with integrated thermal cutoff device for battery pack |
-
1972
- 1972-12-18 US US00316193A patent/US3840834A/en not_active Expired - Lifetime
Cited By (64)
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US4037316A (en) * | 1974-09-23 | 1977-07-26 | General Electric Company | Method of assembling temperature responsive resistance member |
US4038627A (en) * | 1975-04-14 | 1977-07-26 | Johnson Brant T | Electro-thermal isolating switch |
US4044348A (en) * | 1975-09-22 | 1977-08-23 | Gould Inc. | Circuit energization indicator with thermal timing means to maintain the indication for a predetermined time after de-energization |
FR2329096A1 (en) * | 1975-10-21 | 1977-05-20 | Gen Electric | COMBINED STARTING AND PROTECTION DEVICE FOR THE WINDING CIRCUIT OF A MACHINE |
US4042860A (en) * | 1975-10-21 | 1977-08-16 | General Electric Company | Combination starter-protector device |
US4306210A (en) * | 1977-12-31 | 1981-12-15 | Behr-Thomson Dehnstoffregler Gmbh | Two-stage temperature switch |
US4412266A (en) * | 1980-07-02 | 1983-10-25 | Yamada Electric Manufacturing Company Ltd. | AC Electrical device protective thermal relay |
US4310837A (en) * | 1980-10-14 | 1982-01-12 | General Electric Company | Electrical device termination high temperature indicator |
US4720759A (en) * | 1986-05-15 | 1988-01-19 | Tobu Electric Co., Ltd. | Compact protector utilizing a bimetal and an excessive rise prevention portion |
US5048974A (en) * | 1988-05-09 | 1991-09-17 | Jaeger | Temperature measuring device including an alarm contact |
US5214310A (en) * | 1990-11-29 | 1993-05-25 | Emerson Electric Co. | Timing mechanism with a PTC thermistor |
EP0513423A1 (en) * | 1991-05-17 | 1992-11-19 | Siemens Aktiengesellschaft | Line protective circuit breaker with remote shunt-trip device |
US5214405A (en) * | 1991-05-17 | 1993-05-25 | Siemens Aktiengesellschaft | Miniature circuit-breaker with remote tripping |
TR26683A (en) * | 1991-05-17 | 1995-03-15 | Siemens Aktiengesellchaft | REMOTE SHELTER LINE PROTECTION SWITCH |
US20090146823A1 (en) * | 1992-07-01 | 2009-06-11 | David Boyden | Alarm System For Detecting Excess Temperature In Electrical Wiring |
US5675246A (en) * | 1996-03-18 | 1997-10-07 | Msx, Inc. | Current flow indicator |
US6421216B1 (en) | 1996-07-16 | 2002-07-16 | Ewd, Llc | Resetable overcurrent protection arrangement |
US6456476B1 (en) | 1996-07-16 | 2002-09-24 | Tyco Electronics Corporation | Circuit protection relay having bimetal wiper |
US5854585A (en) * | 1997-04-10 | 1998-12-29 | Texas Instruments Incorporated | Manual reset electrical equipment protector apparatus |
US6349022B1 (en) | 1998-09-18 | 2002-02-19 | Tyco Electronics Corporation | Latching protection circuit |
US6020807A (en) * | 1999-02-23 | 2000-02-01 | Portage Electric Products, Inc. | Sealed case hold open thermostat |
US6346796B1 (en) * | 1999-06-25 | 2002-02-12 | Uchiya Thermostat Co., Ltd. | Thermal shut-off device and battery pack |
US6396381B1 (en) * | 1999-07-22 | 2002-05-28 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US6707372B2 (en) * | 2000-10-04 | 2004-03-16 | Honeywell International, Inc. | Thermal switch containing preflight test feature and fault location detection |
US20040047100A1 (en) * | 2000-10-04 | 2004-03-11 | Honeywell International, Inc. | Thermal switch containing preflight test feature and fault location detection |
US6577223B2 (en) * | 2000-10-13 | 2003-06-10 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20050174211A1 (en) * | 2002-06-11 | 2005-08-11 | Hideaki Takeda | Direct current cutoff switch |
US7330097B2 (en) * | 2002-06-11 | 2008-02-12 | Uchiya Thermostat Co., Ltd. | Direct current cutoff switch |
US20050122201A1 (en) * | 2003-08-22 | 2005-06-09 | Honeywell International, Inc. | Thermal switch containing preflight test feature and fault location detection |
US20060109074A1 (en) * | 2004-11-23 | 2006-05-25 | Yim-Shu Lee | Resetable over-current and/or over-temperature protection system |
US7446643B2 (en) * | 2004-11-23 | 2008-11-04 | The Hong Kong Polytechnic University | Resetable over-current and/or over-temperature protection system |
EP2085997A3 (en) * | 2008-01-25 | 2013-07-17 | ABB Oy | Load control apparatus |
EP2085997A2 (en) * | 2008-01-25 | 2009-08-05 | ABB Oy | Load control apparatus |
US8421580B2 (en) * | 2008-01-28 | 2013-04-16 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20100308954A1 (en) * | 2008-01-28 | 2010-12-09 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US8736416B2 (en) * | 2008-01-28 | 2014-05-27 | Uchiya Thermostat Co., Ltd. | Thermal protector |
DE112008003632B4 (en) | 2008-01-28 | 2023-04-06 | Uchiya Thermostat Co., Ltd. | heat protection |
US20130076480A1 (en) * | 2008-01-28 | 2013-03-28 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20130015944A1 (en) * | 2008-04-10 | 2013-01-17 | Uchiya Thermostat Co., Ltd. | External operation thermal protector |
US8519816B2 (en) * | 2008-04-10 | 2013-08-27 | Uchiya Thermostat Co., Ltd. | External operation thermal protector |
US20110043321A1 (en) * | 2008-04-10 | 2011-02-24 | Uchiya Thermostat Co., Ltd. | External operation thermal protector |
US8749341B2 (en) * | 2008-04-10 | 2014-06-10 | Uchiya Thermostat Co., Ltd. | External operation thermal protector |
US20110140827A1 (en) * | 2008-04-18 | 2011-06-16 | Katsuaki Suzuki | Circuit protection device |
US9484171B2 (en) | 2009-03-12 | 2016-11-01 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20120032773A1 (en) * | 2009-03-12 | 2012-02-09 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20120001721A1 (en) * | 2009-03-12 | 2012-01-05 | Uchiya Thermostat Co., Ltd. | Thermal switch |
US9000880B2 (en) * | 2009-03-12 | 2015-04-07 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US9472363B2 (en) | 2009-03-12 | 2016-10-18 | Uchiya Thermostat Co., Ltd. | Thermal protector |
US20100245022A1 (en) * | 2009-03-24 | 2010-09-30 | Tyco Electronics Corporation | Electrically activated surface mount thermal fuse |
US20100245027A1 (en) * | 2009-03-24 | 2010-09-30 | Tyco Electronics Corporation | Reflowable thermal fuse |
US9343253B2 (en) | 2009-03-24 | 2016-05-17 | Tyco Electronics Corporation | Method of placing a thermal fuse on a panel |
US8581686B2 (en) | 2009-03-24 | 2013-11-12 | Tyco Electronics Corporation | Electrically activated surface mount thermal fuse |
US8289122B2 (en) * | 2009-03-24 | 2012-10-16 | Tyco Electronics Corporation | Reflowable thermal fuse |
US8958196B2 (en) | 2009-11-04 | 2015-02-17 | Uchiya Thermostat Co., Ltd. | Electric circuit connected to thermal switch with three terminals |
US8854784B2 (en) | 2010-10-29 | 2014-10-07 | Tyco Electronics Corporation | Integrated FET and reflowable thermal fuse switch device |
US20150022311A1 (en) * | 2010-12-16 | 2015-01-22 | Tyco Electronics Japan G.K. | Protective Device |
US9960000B2 (en) * | 2010-12-16 | 2018-05-01 | Littelfuse Japan G.K. | Protective device |
US20170179462A1 (en) | 2015-12-18 | 2017-06-22 | Bourns, Inc. | Battery housing |
US10439196B2 (en) | 2015-12-18 | 2019-10-08 | Bourns, Inc. | Electromechanical circuit breaker |
US10707475B2 (en) | 2015-12-18 | 2020-07-07 | Bourns, Inc. | Battery housing |
EP3391435A4 (en) * | 2015-12-18 | 2019-08-07 | Bourns, Inc. | Electromechanical circuit breaker and battery housing |
US10985552B2 (en) | 2018-06-22 | 2021-04-20 | Bourns, Inc. | Circuit breakers |
EP3811441A4 (en) * | 2018-06-22 | 2022-03-09 | Bourns, Inc. | Circuit breakers |
US11651922B2 (en) | 2019-08-27 | 2023-05-16 | Bourns, Inc. | Connector with integrated thermal cutoff device for battery pack |
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