US3539956A - Low profile relay - Google Patents

Low profile relay Download PDF

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Publication number
US3539956A
US3539956A US743528A US3539956DA US3539956A US 3539956 A US3539956 A US 3539956A US 743528 A US743528 A US 743528A US 3539956D A US3539956D A US 3539956DA US 3539956 A US3539956 A US 3539956A
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US
United States
Prior art keywords
coil
relay
bobbin
housing
switch
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
Application number
US743528A
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English (en)
Inventor
Clifford H Andersen
Harry Chanowitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arris Technology Inc
Original Assignee
CP Clare and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CP Clare and Co filed Critical CP Clare and Co
Application granted granted Critical
Publication of US3539956A publication Critical patent/US3539956A/en
Assigned to GENERAL INSTRUMENT CORPORATION reassignment GENERAL INSTRUMENT CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: C.P. CLARE & COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
    • H01H51/281—Mounting of the relay; Encapsulating; Details of connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/44—Magnetic coils or windings
    • H01H2050/446—Details of the insulating support of the coil, e.g. spool, bobbin, former

Definitions

  • the center section of the bobbin comprises two walls of a height generally the same as the minor axis of the oval housing spaced from each other generally the length of the major axis so that the coil lies against the elongated walls of the switch housing.
  • the height of the switch and coil-bobbin assembly is reduced and the coil is moved closer to the operating gap.
  • This invention relates to a relay assembly and, more particularly, to a low profile relay using one or more sealed magnetic switches.
  • relays including an assembly of one or more sealed magnetic switches and an operating winding have been known and used for a substantial period of time, the increasing trend toward miniaturization of electronic and electrical components and assemblies in virtually all fields has made it necessary for relay manufactures to attempt corresponding reductions in the size of switching assemblies.
  • one common application for relays using sealed magnetic switches is as a module mounted on a printed circuit board. The height of the module above the board is the most critical dimension to be considered in size reduction because it determines the maximum board-to-board spacing and the ultimate component density.
  • This dimension includes, in a sealed switch module, such factors as switch diameter, the thickness of the winding, the thickness of the relay cover and base, and the thickness of any potting or insulating material required.
  • the two largest of these factors are the coil bobbin and switch diameters.
  • the mean diameter of the coil is a significant factor in the magnetic efiiciency of the relay because the switch is most efficiently operated when the field is disposed as closely as possible to the switch gap.
  • the use of filled coils also suffers from the disadvantage that the glass envelope of the switch is sometimes subjected to the weight of the coil.
  • the inside diameter of the bobbin opening in which the glass switch is to be mounted tends to decrease after molding and winding a coil thereon because of cold flow of the bobbin material.
  • the final inside diameter is a function of the bobbin material, the diameter of the wire used in winding the coil, the number of turns in the coil, and the winding tension. Since the final bobbin opening remaining after some period of storage must be such as to accept the switch, the usual practice is to allow appreciable clearance which increases the height of the module. This clearance is also objectionable because the apparent mean diameter of the coil, as seen by the switch gap, is larger.
  • one object of the persent invention is to provide a low profile relay using a sealed magnetic switch.
  • Another object is to provide a new and improved relay in which the size is reduced and the magnetic efficiency of the relay is increased by using a transversely elongated sealed switch housing and removing the bobbin material from between the elongated sides of the housing and the operating coil.
  • a further object is to provide a new and improved relay using a sealed magnetic switch with an oval housing and a bobbin in which the inner turns of the coil are permitted to engage the switch housing so as to reduce the height of the switch and increase its magnetic efiiciency
  • an embodiment of the invention comprises a sealed switch assembly using one or more sealed magnetic switches located in the axial opening of a coil bobbin on which an operating winding or coil is disposed.
  • the sealed magnetic switch units are quite similar to those that are well known in the art and comprise an elongated glass housing in the opposite ends of which magnetic reeds are sealed with their inner ends normally in a spaced and overlapped relationship to define an operating gap.
  • the elongated glass housing is made elliptical or oval in section with the major axis of the ellipse or oval extending parallel to the enlarged or flattened end portions of the reeds.
  • the portions of the magnetic reeds forming the operating gap are disposed closer to the outside wall of the adjacent portion of the housing.
  • the mean diameter of the coil as seen by the operating gap is substantially reduced with the result that the magnetic efiiciency of the relay is improved, thereby permitting a smaller operating coil or winding to be used with an attendant reduction in the projection of the relay module above the surface of the printed circuit panel.
  • FIG. 1 is a side elevational view in partial section of a relay embodying the present invention
  • FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 1;
  • FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1;
  • FIG. 4 is an enlarged perspective view of a coil bobbin used in the relay.
  • FIG. 1 of the drawings therein is illustrated a relay which embodies the present invention and which is formed by a sealed.
  • magnetic switch 12 disposed within the axial opening on a coil bobbin indicated generally as 1-4 on which is disposed an operating winding or coil 16.
  • the configurations of the components 12, 14, and 16 are such that the magnetic efiiciency of the switch 10 is improved, and this switch requires a minimum or greatly reduced standoif height from a supporting panel or printed circuit board.
  • the sealed magnetic switch unit 12 is in most respects similar to sealed magnetic or reed switch units that are well known in the art in including an elongated glass or insulating housing 18 in the opposite ends of which a pair of magnetic reeds 20 are sealed with a portion of each of these reeds disposed beyond the ends of the housing 18 to provide a means for extending electrical connections.
  • the inner ends of the reeds 20 are provided with transversely elongated or flattened portions 20A normally disposed in a spaced but overlapping relation to define an operating gap.
  • the sealed switch unit 12 differs from those known before by providing a glass housing 18 that is generally elliptical or oval in its configuration (FIG. 2)' or section (FIG. 3).
  • the reeds 20 and the glass housing 18 are so arranged that the transversely elongated or flattened portions 20A of the reeds extend generally parallel to the major axis of the oval or elliptical section of the glass housing 18 (FIG. 3).
  • the operating gap between the overlapped ends 20A is more closely disposed adjacent the outer surface of the housing 18 along its elongated sides than would be the case with the usual glass housing that is generally circular in section.
  • the bobbin construction 14 can be formed integrally or of several parts and of a plastic material such as nylon or any other suitable nonmagnetic material.
  • the bobbin structure 14 includes a pair of spaced. end walls 22 and 24 joined by a central portion indicated generally as 26.
  • the structures 22, 24, and 26 define an axially extending opening indicated generally as 28 in which the sealed switch 12 is received.
  • the central portion 26 is defined by a pair of spaced walls 30 and 32 which are spaced from each other a distance generally equal to the length of the major axis of the oval section of the glass housing 18 to define an open gap or slot 33 therebetween (FIG. 3).
  • the walls 30 and 32 have a height measured in a direction parallel to the minor axis of the oval section of the housing 18 that is substantially equal to the length of the minor axis (FIG. 3).
  • the outer corners of the two walls 30 and 32 are provided with a radius to avoid presenting a sharp edge to the inner turns of the coil 16, and the central portions of the inner surfaces of these walls are provided with arcuate recesses to accommodate or receive the rounded edges of the housing 18.
  • the coil 16 is wound on the bobbin structure 14 to be disposed between the end walls 22 and 24 with the inner turns engaging the outer surface of the walls 30 and 32 forming the central portion 26 of the bobbin structure 14.
  • the bobbin structure 14 provides a winding form which carries the tension and weight of the coil 16 and isolates this weight from the housing 18 of the sealed switch 12.
  • the inner turns may sag slightly into the opening 28 in the open areas between the side walls 30 and 32.
  • the elongated walls of the housing 18 displace any sagging portion of the coil 16 so that the coil is in immediate proximity to or engages the transversely elongated side walls of the glass housing 18, thereby to place the coil as close as possible to the overlapped end portions 20A of the magnetic reeds 20 (FIG. 3).
  • the two end walls 22 and 24 are provided with projecting portions 22A, 22B, and 24A, 24B in each of which is formed an arcuate groove or slot 34 (FIGS. 2 and 4).
  • These grooves 34 are used to mount up to four terminals 36 on the relay structure 10, up to two on each of the end walls 22 and 24.
  • Each of the terminals 36 includes an arcuate portion 36A of a configuration corresponding to that of the groove 34, which arcuate portion is pressed into the groove 34 and secured therein.
  • a heated plate is pressed against the outer surface of the projecting portions 22A, 22B, 24A, and 24B as necessary to warm the plastic material of the bobbin 14 and distort this material into the groove 34 over the arcuate portion 36A of the terminals 36 thereby to stake or secure the terminals in position.
  • the terminals 36 are used to extend electrical connections between terminal pins or external circuits and the coil 16 or the terminal portions of the magnetic reeds 20.
  • a leg 36B of the terminal 36 extends in the position shown in dashed outline in FIG. 2 when the terminal 36 is mounted on the end wall 22, 24.
  • a start lead 38 for the coil 16 can extend between the walls 30, 32 into the opening 28 and around the projecting portion 22B (FIG. 2) to a point adjacent the leg 36B of the terminal 36. This completely protects this lead and avoids the necessity of molding specially formed openings or recesses in the bobbin structure 14.
  • the adjacent portion of the end walls 22, 24 is provided with a recess 22C or 24C so that the leg 36B does not extend beyond the outline of the end walls.
  • Another leg 36C on the terminal 36 is used to extend the external connection, and although is shown in the drawings as extending generally parallel to the terminal portions of the reeds 20, can also be bent to any suitable position.
  • the relay 10 can be mounted directly on a printed circuit board by placing the lower edges of the end walls 22, 24 (FIGS. 2 and 3) on the printed circuit board so that the major axis of the oval section of the glass housing 18 extends generally parallel to the board. Suitable terminals on the board or connecting means can be used to mount the relay 10 and to extend electrical connections to the terminals 36 and the magnetic reeds 20. In a preferred embodiment, however, the relay 10 is enclosed within a housing which may be filled with a potting material and perhaps provided with a base carrying terminal connectors which are electrically connected to the terminals 36 and the magnetic reeds 20. In this relay module, the orientation of the relay 10 to the plane of the printed circuit board is the same as that described.
  • the finished encapsulated relay has a height of .187 maximum, a height considerably smaller than anything now known.
  • This reduction in height is achieved by the use of the oval glass housing 18 with the major axis of this oval section of the housing extending parallel to'the enlarged portions of the reeds 20 and also to the plane of the printed circuit board.
  • This height reduction is also made possible by the complete removal of the bobbin material along the elongated sides of the oval section of the glass housing 18 to effectively reduce the mean diameter of the coil 16. This increases the magnetic efficiency of the switch and permits the use of a coil 16 smaller than would be possible with the usual circular switch housing and bobbin.
  • the bobbin structure 14 can be made with the walls 30 and 32 spaced from each other by a distance that is a whole number multiple of the length of the major axis of the oval section of the glass housing 18 to permit a number of sealed switches 12 to be placed in side-by-side relation within the opening 28.
  • a relay would embody the advantages attained in the illustrated construction.
  • a relay comprising a sealed magnetic switch having an elongated insulating housing in which are sealed contacts movable into and out of engagement by a magnetic field, said housing having an elongated cross section with its width measured in a first direction being of a first value that is greater than a second value of its height measured in a second direction generally transverse to the first direction,
  • a coil bobbin structure having two longitudinally elongated and generally parallel walls forming an elongated opening in which the sealed magnetic switch is disposed, said walls being transversely spaced from each other a distance substantially equal to said first value or a whole number multiple thereof to provide an open gap therebetween, said walls also having a height substantially equal to said second value,
  • the relay set forth in claim 1 including 7 arcuate slots formed on the bobbin structure at the opposite ends thereof each disposed within a plane extending transverse to the direction of elongation of the opening in the bobbin structure,
  • terminals including arcuate portions secured in the slots and another portion projecting outwardly beyond the ends of the bobbin structure.
  • An eflicient, low profile relay comprising a coil bobbin having a pair of spaced end walls joined by a center portion, said center portion including a pair of spaced and generally parallel walls of a given height, said end walls and said center portion having an axial opening through the bobbin and said spaced walls defining an open gap therebetween.
  • a sealed magnetic switch unit disposed within said axial opening, said sealed switch including an elongated and hollow insulating housing that is generally oval in section, the minor axis of said oval being substantially the same as said given height, said sealed switch also including a pair of magnetic elements sealed in the opposite ends of the housing and extending axially into the housing, said magnetic elements having generally fiat end portions spaced from each other in an overlapping but spaced relation with the flat end portions extending generally parallel to the major axis of the oval, and a winding carried on the center portion of the bobbin between the end walls and disposed immediately ad acent the outer wall of the housing in the gap between the spaced walls of the center portion of the bobbin.
  • a relay construction comprising a bobbin structure including spaced end walls connected by a center portion forming an axial openmg, said center portion having at least one slot therein extending substantially from one end wall to the other,
  • a sealed switch unit disposed in the axial opening, a coil terminal carried on at least one of the end walls, a coil carried on the center portion of the bobbin structure, and a coil lead conected to the coil and extending through said slot and said axial opening to be connected to said coil terminal at a point outside said bobbin structure.
  • the end wall includes a recessed area forming an acute angle, said area facing outwardly away from the center portion of the bobbin structure and receiving a correspondingly formed portion of the coil terminal to mount the coil terminal on the end wall.
  • said one end wall is generally uniplanar and includes a projecting portion on which said coil terminal is carried, said coil lead extending around the projecting portion to lie in a position spaced inwardly from the outermost part of said one end wall.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
US743528A 1968-07-09 1968-07-09 Low profile relay Expired - Lifetime US3539956A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74352868A 1968-07-09 1968-07-09

Publications (1)

Publication Number Publication Date
US3539956A true US3539956A (en) 1970-11-10

Family

ID=24989128

Family Applications (1)

Application Number Title Priority Date Filing Date
US743528A Expired - Lifetime US3539956A (en) 1968-07-09 1968-07-09 Low profile relay

Country Status (7)

Country Link
US (1) US3539956A (enrdf_load_stackoverflow)
JP (1) JPS4816108B1 (enrdf_load_stackoverflow)
BE (1) BE735538A (enrdf_load_stackoverflow)
DE (1) DE1934795C3 (enrdf_load_stackoverflow)
FR (1) FR2012537A1 (enrdf_load_stackoverflow)
GB (1) GB1265887A (enrdf_load_stackoverflow)
SE (1) SE368477B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760311A (en) * 1972-04-17 1973-09-18 Datron Systems Inc Reed relay
US3794944A (en) * 1972-09-18 1974-02-26 Morex Inc Reed switches and process for making them
DE2703584A1 (de) * 1977-01-28 1978-08-03 Siemens Ag Elektromagnetisches relais
US4145805A (en) * 1977-05-11 1979-03-27 Standex International Corporation Method of making a reed relay with molded bobbin
US4232281A (en) * 1978-06-01 1980-11-04 Standex International Corporation In-line package relay
US4988965A (en) * 1990-03-26 1991-01-29 The Chamberlain Group, Inc. Reed switch holder assembly
US20070099471A1 (en) * 2005-10-27 2007-05-03 Hon Hai Precision Industry Co., Ltd. Electronic device assembly
CN111786467A (zh) * 2020-07-24 2020-10-16 重庆华创智能科技研究院有限公司 一种无线电能传输机构及高压取电无线电能传输系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54178747U (enrdf_load_stackoverflow) * 1978-06-06 1979-12-17
DE3837299A1 (de) * 1988-11-03 1990-05-10 Hengstler Bauelemente Verfahren und vorrichtung zur herstellung eines schleifenrelais

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129311A (en) * 1961-05-20 1964-04-14 Telefonbau & Normalzeit Gmbh Damping means for magnetic reed contact
DE1210474B (de) * 1963-04-01 1966-02-10 Telefonbau In einem Schutzrohr eingebetteter magnetisch steuerbarer Kontakt
US3263043A (en) * 1964-09-08 1966-07-26 Automatic Elect Lab Techniques for the construction of reed relays
US3265825A (en) * 1964-06-29 1966-08-09 Grigsby Barton Inc Electrical relay
US3434079A (en) * 1967-03-27 1969-03-18 Essex Wire Corp Encapsulated reed switch relay construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129311A (en) * 1961-05-20 1964-04-14 Telefonbau & Normalzeit Gmbh Damping means for magnetic reed contact
DE1210474B (de) * 1963-04-01 1966-02-10 Telefonbau In einem Schutzrohr eingebetteter magnetisch steuerbarer Kontakt
US3265825A (en) * 1964-06-29 1966-08-09 Grigsby Barton Inc Electrical relay
US3263043A (en) * 1964-09-08 1966-07-26 Automatic Elect Lab Techniques for the construction of reed relays
US3434079A (en) * 1967-03-27 1969-03-18 Essex Wire Corp Encapsulated reed switch relay construction

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760311A (en) * 1972-04-17 1973-09-18 Datron Systems Inc Reed relay
US3794944A (en) * 1972-09-18 1974-02-26 Morex Inc Reed switches and process for making them
US3866317A (en) * 1972-09-18 1975-02-18 Morex Inc Reed switches and process for making them
DE2703584A1 (de) * 1977-01-28 1978-08-03 Siemens Ag Elektromagnetisches relais
US4145805A (en) * 1977-05-11 1979-03-27 Standex International Corporation Method of making a reed relay with molded bobbin
US4232281A (en) * 1978-06-01 1980-11-04 Standex International Corporation In-line package relay
US4988965A (en) * 1990-03-26 1991-01-29 The Chamberlain Group, Inc. Reed switch holder assembly
US20070099471A1 (en) * 2005-10-27 2007-05-03 Hon Hai Precision Industry Co., Ltd. Electronic device assembly
US7285002B2 (en) * 2005-10-27 2007-10-23 Hon Hai Precision Industry Co., Ltd. Electronic device assembly
CN111786467A (zh) * 2020-07-24 2020-10-16 重庆华创智能科技研究院有限公司 一种无线电能传输机构及高压取电无线电能传输系统
CN111786467B (zh) * 2020-07-24 2022-04-01 重庆华创智能科技研究院有限公司 一种无线电能传输机构及高压取电无线电能传输系统

Also Published As

Publication number Publication date
FR2012537A1 (enrdf_load_stackoverflow) 1970-03-20
DE1934795C3 (de) 1975-10-16
BE735538A (enrdf_load_stackoverflow) 1969-12-16
JPS4816108B1 (enrdf_load_stackoverflow) 1973-05-19
GB1265887A (enrdf_load_stackoverflow) 1972-03-08
DE1934795B2 (de) 1971-11-18
DE1934795A1 (de) 1970-01-29
SE368477B (enrdf_load_stackoverflow) 1974-07-01

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Owner name: GENERAL INSTRUMENT CORPORATION

Free format text: MERGER;ASSIGNOR:C.P. CLARE & COMPANY;REEL/FRAME:004035/0457

Effective date: 19800516