US3842188A - Device for holding and contacting thermally loaded ceramic resistors in a case - Google Patents

Device for holding and contacting thermally loaded ceramic resistors in a case Download PDF

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Publication number
US3842188A
US3842188A US00415119A US41511973A US3842188A US 3842188 A US3842188 A US 3842188A US 00415119 A US00415119 A US 00415119A US 41511973 A US41511973 A US 41511973A US 3842188 A US3842188 A US 3842188A
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resistor
case
holding
thermally loaded
rib
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US00415119A
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P Petersen
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Danfoss AS
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Danfoss AS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/01—Mounting; Supporting
    • H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections

Definitions

  • the invention relates to a device for holding and contacting thermally loaded ceramic resistors.
  • Thermally loaded ceramic resistors such as PTC resistors are generally brittle and, while they have the characteristic of a substantial temperature expansion coefficient, they are relatively weak structurally.
  • the device hereof which accommodates a PTC resistor includes resiliently biased electrical contacts which old the resistor firmly in a fixed position while permitting the resistor to expand freely upon being heated without incurring stresses wihch would cause breakage.
  • the object of the present invention is that of further simplifying the construction of such device.
  • This object is achieved by making the disc in two parts which are formed by ribs integrally injection moulded with the two parts of the case.
  • the rib which surrounds the resistor body is provided with parallel extensions and is connected through transverse webs only at the ends of these extensions and at the middle of the rib. In this way very large ventilation openings are created between the side walls of the casing, which openings are covered only by the width of the rib.
  • the rib on the other part of the case is associated with a peripheral portion of the resistor body that occupies considerably less than 180 of the circumference of said body. In the extreme case it suffices if said rib is associated with a point on this peripheral portion.
  • FIG. 1 is a longitudinal section through a resistor holding device in accordance with the invention
  • FIG. 2 is a cross section on line 2-2 of FIG. 1;
  • FIG. 3 is a vertical elevation view of the right side of the view shown in FIG. 1;
  • FIG. 4 is a vertical elevational view with parts broken away of the left side of the view shown in FIG. 1;
  • FIG. 5 is a top view partially in section of the view shown in FIG. 1.
  • the device has a case consisting of two parts 1 and 2 which are brought into register with each other by means of an edge 3 and are interconnected by a rivet 4.
  • a PTC resistor body 5 in the form of a cylindrical disc is held loosely by its median part in a hole 6 which is formed in a disc constituted by two ribs 7 and 8.
  • the rib 7 is integrally injection moulded with part I of the case, and the rib 8 with part 2 of the case.
  • Double contacts 9 and 10 engage the two end faces of the resistor body 5. These contacts are parts of contact plate sections 11 which bear against the side walls 12 and 13 of part 1 of the case and project outwardly to form terminal connections 14.
  • the hole 6 formed by the ribs 7 and 8, receiving the disc is not round. Instead, only a l-portion of the rib 7 is associated with the periphery of the resistor body 5, and the rib 8 is associated with a bearing point. However this suffices to hold the resistor body 5 in position between the resilient contacts 9 and 10.
  • the rib 7 has two extensions 15 and 16. It is connected to the side walls 12 and 13 by transverse webs l7, l8 and 19 only at the ends of these extensions and at the middle of the rib. Consequently, large ventilation openings 20 and 21, through which air for cooling the resistor body 5 may pass, are left at both sides of the rib 7 and of its extensions 15 and 16.
  • the resistor body 5 together with the contact plates 11 are pushed into part 1 of the case.
  • the rib 7 holds the resistor body in its final position.
  • Application of the rib 8 when part 2 of the case is fitted ensures that this position is also maintained during operation.
  • the material of the entire case may be any one of a large number of electrically insulating heat resisting plastic substances.
  • a device for holding and contacting a thermally loaded disc shaped ceramic resistor comprising a casing having first and second parts, means fastening said parts together, said first casing part having a U-shaped rib straddled by U-shaped end walls, web means connecting said end walls and said U-shaped rib, said second casing part having a rectangularly shaped rib aligned with said U-shaped rib to form a resistor cavity therebetween, and a pair of resilient electrical contacts disposed on opposite sides of said cavity for resiliently engaging the opposite sides of a resistor when disposed in said cavity and for resiliently engaging said end walls.

Abstract

The invention relates to a device for holding and contacting thermally loaded ceramic resistors. Thermally loaded ceramic resistors such as PTC resistors are generally brittle and, while they have the characteristic of a substantial temperature expansion coefficient, they are relatively weak structurally. The device hereof which accommodates a PTC resistor includes resiliently biased electrical contacts which old the resistor firmly in a fixed position while permitting the resistor to expand freely upon being heated without incurring stresses wihch would cause breakage.

Description

United States Patent [191 on 3,842,188
Petersen Oct. 15, 1974 541 DEVICE FOR HOLDING AND CONTACTING 3,130,032 7/1373 Petersen at al. 333/333 x THERMALLY LOADED CERAMIC RESISTORS IN A CASE Poul Petersen, Nordborg, Denmark Assignee: Danfoss A/S, Nordborg, Denmark Filed: Nov. 12, 1973 Appl. No.: 415,119
Inventor:
Foreign Application Priority Data Nov. 14, I972 Germany 2255664 US. Cl. 174/52 R, 338/57, 338/220, 338/232, 338/316 Int. Cl H016 1/02, HOlc 1/08 Field of Search 174/16 R, 52 R; 338/22 R, 338/53, 57, 220, 226, 232, 315, 316
References Cited UNITED STATES PATENTS 7/1973 Halstead l74/52 R Primary Examiner -Laramie E. Askin [57] ABSTRACT The invention relates to a device for holding and contacting thermally loaded ceramic resistors. Thermally loaded ceramic resistors such as PTC resistors are generally brittle and, while they have the characteristic of a substantial temperature expansion coefficient, they are relatively weak structurally. The device hereof which accommodates a PTC resistor includes resiliently biased electrical contacts which old the resistor firmly in a fixed position while permitting the resistor to expand freely upon being heated without incurring stresses wihch would cause breakage.
1 Claim, 5 Drawing Figures PATENIEUUCT 1 51914 SHEET 20F 2 3 SHQ Q DEVICE FOR HOLDING AND CONTACTING THERMALLY LOADED CERAMIC RESISTORS IN A CASE Devices are known for holding and contacting thermally loaded ceramic resistors in a case, in particular PTC resistors, in which device the resistor body is held in position by electrical contacts which bear in a mechanically positive manner agains the planar end faces of the body. It is also known to loosely guide the resistor body at its median portion in a hole which corresponds to the cross section of the body and is formed in a disc made of electrically insulating heat resisting material and held in the case. In this arrangement, the case may consist of two interconnected parts. This enables the ceramic resistor to be held and contacted very firmly without the danger of the resistor being irreparably damaged. Furthermore, the surface of the resistor body can be reached by the surrounding air over a large area, so that uniform heating and cooling of the surface results.
The object of the present invention is that of further simplifying the construction of such device.
This object is achieved by making the disc in two parts which are formed by ribs integrally injection moulded with the two parts of the case.
In this construction it is not necessary to produce the disc as a separate component. Holding means for securing the disc in the case are also unnecessary. A very simple construction therefore results.
Particular advantage is achieved if that part of the case that carries the'electrical contacts applied in a mechanically positive manner has a rib which surrounds the resistor body over approximately 180. The resistor body can therefore be mounted practically entirely in one of the parts of the case. The rib provided on the second part of the case is then only required to ensure that the resistor body cannot at a later stage move out of the assembly position so achieved.
In a preferred embodiment the rib which surrounds the resistor body is provided with parallel extensions and is connected through transverse webs only at the ends of these extensions and at the middle of the rib. In this way very large ventilation openings are created between the side walls of the casing, which openings are covered only by the width of the rib.
It suffices if the rib on the other part of the case is associated with a peripheral portion of the resistor body that occupies considerably less than 180 of the circumference of said body. In the extreme case it suffices if said rib is associated with a point on this peripheral portion.
The invention will now be described in greater detail by reference to a form of construction illustrated in the drawing, in which:
FIG. 1 is a longitudinal section through a resistor holding device in accordance with the invention,
FIG. 2 is a cross section on line 2-2 of FIG. 1;
FIG. 3 is a vertical elevation view of the right side of the view shown in FIG. 1;
FIG. 4 is a vertical elevational view with parts broken away of the left side of the view shown in FIG. 1; and
FIG. 5 is a top view partially in section of the view shown in FIG. 1.
The device has a case consisting of two parts 1 and 2 which are brought into register with each other by means of an edge 3 and are interconnected by a rivet 4. A PTC resistor body 5 in the form of a cylindrical disc is held loosely by its median part in a hole 6 which is formed in a disc constituted by two ribs 7 and 8. The rib 7 is integrally injection moulded with part I of the case, and the rib 8 with part 2 of the case. Double contacts 9 and 10 engage the two end faces of the resistor body 5. These contacts are parts of contact plate sections 11 which bear against the side walls 12 and 13 of part 1 of the case and project outwardly to form terminal connections 14.
In the present embodiment, the hole 6 formed by the ribs 7 and 8, receiving the disc, is not round. Instead, only a l-portion of the rib 7 is associated with the periphery of the resistor body 5, and the rib 8 is associated with a bearing point. However this suffices to hold the resistor body 5 in position between the resilient contacts 9 and 10.
The rib 7 has two extensions 15 and 16. It is connected to the side walls 12 and 13 by transverse webs l7, l8 and 19 only at the ends of these extensions and at the middle of the rib. Consequently, large ventilation openings 20 and 21, through which air for cooling the resistor body 5 may pass, are left at both sides of the rib 7 and of its extensions 15 and 16.
When assembling the device, the resistor body 5 together with the contact plates 11 are pushed into part 1 of the case. As this happens, the rib 7 holds the resistor body in its final position. Application of the rib 8 when part 2 of the case is fitted ensures that this position is also maintained during operation.
The material of the entire case may be any one of a large number of electrically insulating heat resisting plastic substances.
I claim:
1. A device for holding and contacting a thermally loaded disc shaped ceramic resistor comprising a casing having first and second parts, means fastening said parts together, said first casing part having a U-shaped rib straddled by U-shaped end walls, web means connecting said end walls and said U-shaped rib, said second casing part having a rectangularly shaped rib aligned with said U-shaped rib to form a resistor cavity therebetween, and a pair of resilient electrical contacts disposed on opposite sides of said cavity for resiliently engaging the opposite sides of a resistor when disposed in said cavity and for resiliently engaging said end walls. a: =k

Claims (1)

1. A device for holding and contacting a thermally loaded disc shaped ceramic resistor comprising a casing having first and second parts, means fastening said parts together, said first casing part having a U-shaped rib straddled by U-shaped end walls, web means connecting said end walls and said U-shaped rib, said second casing part having a rectangularly shaped rib aligned with said U-shaped rib to form a resistor cavity therebetween, and a pair of resilient electrical contacts disposed on opposite sides of said cavity for resiliently engaging the opposite sides of a resistor when disposed in said cavity and for resiliently engaging said end walls.
US00415119A 1972-11-14 1973-11-12 Device for holding and contacting thermally loaded ceramic resistors in a case Expired - Lifetime US3842188A (en)

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DE2255664A DE2255664C2 (en) 1972-11-14 1972-11-14 Device for holding and contacting thermally loaded ceramic resistors in a housing

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JP (2) JPS4978944A (en)
AR (1) AR205334A1 (en)
BR (1) BR7308850D0 (en)
CA (1) CA997441A (en)
DD (1) DD107166A6 (en)
DE (1) DE2255664C2 (en)
DK (1) DK150553C (en)
ES (1) ES420478A1 (en)
FR (1) FR2206565B2 (en)
GB (1) GB1417264A (en)
IT (1) IT1046433B (en)
SE (1) SE381363B (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921117A (en) * 1974-11-29 1975-11-18 Texas Instruments Inc Solid state electrical switch
US3924222A (en) * 1974-10-09 1975-12-02 Thermo Electronics Inc Resistance devices for use in energizing the starting winding of a split phase induction motor
US3925748A (en) * 1973-11-08 1975-12-09 Thermo Electronics Inc Resistance device for use in energizing the starting winding of a split phase induction motor
US3955170A (en) * 1974-11-29 1976-05-04 Texas Instruments Incorporated Solid state switch
US3988709A (en) * 1975-05-12 1976-10-26 Eugene T. McKinnon Electric motor controlling relay
DE2849584A1 (en) * 1977-11-15 1979-05-17 Texas Instruments Inc THERMAL RELAY AND METHOD OF ASSEMBLING SUCH RELAY
US4241370A (en) * 1978-11-14 1980-12-23 Texas Instruments Incorporated Thermal relays particularly for starting single-phase asynchronous motors
US4267635A (en) * 1976-05-03 1981-05-19 Texas Instruments Incorporated Method of making a solid state electrical switch
US4299026A (en) * 1978-11-14 1981-11-10 Texas Instruments Incorporated Method of assembling a motor starting relay
EP0062167A2 (en) * 1981-03-31 1982-10-13 Siemens Aktiengesellschaft Electrical component centered and adjusted in a casing
US4431983A (en) * 1980-08-29 1984-02-14 Sprague Electric Company PTCR Package
US4504817A (en) * 1981-04-13 1985-03-12 Murata Manufacturing Co., Ltd. Demagnetizing circuit using a PTC thermistor device
FR2551910A1 (en) * 1983-09-09 1985-03-15 Tdk Corp RESISTANT DEVICE WITH POSITIVE TEMPERATURE COEFFICIENT
EP0307165A2 (en) * 1987-09-07 1989-03-15 Murata Manufacturing Co., Ltd. Positive temperature coefficient thermistor device
US5153555A (en) * 1989-11-28 1992-10-06 Murata Manufacturing Co., Ltd. Electronic device comprising a plate-shaped electronic element and a support and overcurrent protector for the same
US5281758A (en) * 1992-11-12 1994-01-25 Gte Products Corporation Electrical contact with shock absorbing means
US5729416A (en) * 1995-05-30 1998-03-17 General Electric Company Motor starter and protector module
EP1739702A1 (en) * 2005-06-29 2007-01-03 Sanyo Electric Co., Ltd. Starter relay
DE102006055216A1 (en) * 2006-11-21 2008-05-29 Eichenauer Heizelemente Gmbh & Co. Kg Heating device for use in diesel filter system of diesel engine, has contact plates pressed by initial load in housing, so that front surfaces of plates are pressed against heating element by spring loads exercised by side pieces of plates
US20090162041A1 (en) * 2007-12-21 2009-06-25 Beetz Klaus Dr Heating device for fuel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743761A (en) * 1971-08-10 1973-07-03 Gen Electric High voltage rectifier holder
US3750082A (en) * 1972-06-15 1973-07-31 Danfoss As Plug assembly with resistor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029096B (en) * 1954-07-20 1958-04-30 Westinghouse Brake & Signal Sealed dry rectifier arrangement and method for its manufacture
US2880295A (en) * 1957-05-10 1959-03-31 Gen Telephone Lab Inc Silicon carbide resistor mounting
US3568013A (en) * 1968-12-30 1971-03-02 Texas Instruments Inc Solid-state switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743761A (en) * 1971-08-10 1973-07-03 Gen Electric High voltage rectifier holder
US3750082A (en) * 1972-06-15 1973-07-31 Danfoss As Plug assembly with resistor

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925748A (en) * 1973-11-08 1975-12-09 Thermo Electronics Inc Resistance device for use in energizing the starting winding of a split phase induction motor
US3924222A (en) * 1974-10-09 1975-12-02 Thermo Electronics Inc Resistance devices for use in energizing the starting winding of a split phase induction motor
US3955170A (en) * 1974-11-29 1976-05-04 Texas Instruments Incorporated Solid state switch
US3921117A (en) * 1974-11-29 1975-11-18 Texas Instruments Inc Solid state electrical switch
US3988709A (en) * 1975-05-12 1976-10-26 Eugene T. McKinnon Electric motor controlling relay
US4267635A (en) * 1976-05-03 1981-05-19 Texas Instruments Incorporated Method of making a solid state electrical switch
DE2849584A1 (en) * 1977-11-15 1979-05-17 Texas Instruments Inc THERMAL RELAY AND METHOD OF ASSEMBLING SUCH RELAY
US4241370A (en) * 1978-11-14 1980-12-23 Texas Instruments Incorporated Thermal relays particularly for starting single-phase asynchronous motors
US4299026A (en) * 1978-11-14 1981-11-10 Texas Instruments Incorporated Method of assembling a motor starting relay
US4431983A (en) * 1980-08-29 1984-02-14 Sprague Electric Company PTCR Package
EP0062167A2 (en) * 1981-03-31 1982-10-13 Siemens Aktiengesellschaft Electrical component centered and adjusted in a casing
EP0062167A3 (en) * 1981-03-31 1984-03-28 Siemens Aktiengesellschaft Electrical component centered and adjusted in a casing
US4504817A (en) * 1981-04-13 1985-03-12 Murata Manufacturing Co., Ltd. Demagnetizing circuit using a PTC thermistor device
FR2551910A1 (en) * 1983-09-09 1985-03-15 Tdk Corp RESISTANT DEVICE WITH POSITIVE TEMPERATURE COEFFICIENT
EP0307165A2 (en) * 1987-09-07 1989-03-15 Murata Manufacturing Co., Ltd. Positive temperature coefficient thermistor device
EP0307165A3 (en) * 1987-09-07 1990-01-17 Murata Manufacturing Co., Ltd. Positive temperature coefficient thermistor device
US5153555A (en) * 1989-11-28 1992-10-06 Murata Manufacturing Co., Ltd. Electronic device comprising a plate-shaped electronic element and a support and overcurrent protector for the same
US5281758A (en) * 1992-11-12 1994-01-25 Gte Products Corporation Electrical contact with shock absorbing means
US5729416A (en) * 1995-05-30 1998-03-17 General Electric Company Motor starter and protector module
CN100517944C (en) * 2005-06-29 2009-07-22 三洋电机株式会社 Starter relay
EP1739702A1 (en) * 2005-06-29 2007-01-03 Sanyo Electric Co., Ltd. Starter relay
US20070001801A1 (en) * 2005-06-29 2007-01-04 Masahide Kobayasi Starter relay
US7522030B2 (en) 2005-06-29 2009-04-21 Sanyo Electric Co., Ltd. Starter relay
US20080124062A1 (en) * 2006-11-12 2008-05-29 Kai Wallhaeusser Heating device for diesel fuel and heatable diesel filter system
DE102006055216A1 (en) * 2006-11-21 2008-05-29 Eichenauer Heizelemente Gmbh & Co. Kg Heating device for use in diesel filter system of diesel engine, has contact plates pressed by initial load in housing, so that front surfaces of plates are pressed against heating element by spring loads exercised by side pieces of plates
US7860381B2 (en) 2006-11-21 2010-12-28 Eichenauer Heizelemente Gmbh & Co. Kg Heating device for diesel fuel and heatable diesel filter system
US20090162041A1 (en) * 2007-12-21 2009-06-25 Beetz Klaus Dr Heating device for fuel
US8301021B2 (en) * 2007-12-21 2012-10-30 Mahle International Gmbh Heating device for fuel

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IT1046433B (en) 1980-06-30
DE2255664C2 (en) 1974-11-28
FR2206565A2 (en) 1974-06-07
DK150553B (en) 1987-03-23
DD107166A6 (en) 1974-07-05
AR205334A1 (en) 1976-04-30
CA997441A (en) 1976-09-21
SE381363B (en) 1975-12-01
FR2206565B2 (en) 1978-07-07
JPS5397747U (en) 1978-08-08
GB1417264A (en) 1975-12-10
DE2255664B1 (en) 1974-04-25
JPS4978944A (en) 1974-07-30
DK150553C (en) 1988-03-28
ES420478A1 (en) 1976-04-01
JPS5417134Y2 (en) 1979-07-03
BR7308850D0 (en) 1974-08-22

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