GB2129772A - A transformer bobbin - Google Patents

A transformer bobbin Download PDF

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Publication number
GB2129772A
GB2129772A GB08231822A GB8231822A GB2129772A GB 2129772 A GB2129772 A GB 2129772A GB 08231822 A GB08231822 A GB 08231822A GB 8231822 A GB8231822 A GB 8231822A GB 2129772 A GB2129772 A GB 2129772A
Authority
GB
United Kingdom
Prior art keywords
wire
locking
kink
terminal pin
terminal
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.)
Granted
Application number
GB08231822A
Other versions
GB2129772B (en
Inventor
Terence Norman Turnber
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB08231822A priority Critical patent/GB2129772B/en
Publication of GB2129772A publication Critical patent/GB2129772A/en
Application granted granted Critical
Publication of GB2129772B publication Critical patent/GB2129772B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H01F2005/043—Arrangements of electric connections to coils, e.g. leads having multiple pin terminals, e.g. arranged in two parallel lines at both sides of the coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H01F2005/046—Details of formers and pin terminals related to mounting on printed circuits

Abstract

A transformer bobbin having at least one self-locking terminal pin 22 in an aperture 28 of an end flange 16 of the bobbin, the terminal pin 22 being bent through substantially 90 DEG so that it has a pair of arms 24,26 extending at substantially 90 DEG to each other, and one of the arms 24 of the terminal pin being provided with a locking kink 30 which combines with the other of the arms 26 of the terminal pin and surfaces 32,34 of the flange to lock the terminal pin in position. Each terminal pin may be made from electro-solder coated copper wire, the coil(s) may be wrapped in insulating tape, and interlocking, C- shaped, soft iron laminations may be provided in the channel (48, Figure 5) which extends at right angles to the channels (44,46 Figure 5) into which the coils may be wound. The entire laminations and the insulating tape may be coated with resin or varnish. The terminal pin may be formed in a machine having a sleeve, a feeder, a wire cropper and a kink forming jaw (74, Figure 11). <IMAGE>

Description

SPECIFICATION A transformer bobbin This invention relates to a transformer bobbin.
Transformer bobbins are well known and difficulty often arises in providing the transformer bobbins with terminal pins. Often relatively complex and time consuming operations are required.
It is an aim of the present invention to provide a transformer bobbin having an easily fitted terminal pin.
Accordingly, this invention provides a transformer bobbin having at least one self-locking terminal pin, the terminal pin being bent through substantially 9Q" so that it has a pair of arms extending at substantially 90 to each other, and one of the arms of the terminal pin being provided with a locking kink which combines with the other of the arms of the terminal pin to lock the terminal pin in position.
The locking kink may be formed by a doubled portion of the terminal pin.
The transformer bobbin may be such that there are twelve self-locking terminal pins.
The or each terminal pin may be made from electro soldar coated copper wire.
The transformer bobbin may comprise a moulded bobbin body formed of an electrically insulating material, the said at least one self-locking terminal pin being mounted on the moulded bobbin body, a coil wound around a central core part of the moulded bobbin body, and soft iron lamination supported by the moulded bobbin body.
The coil will usually be wrapped in an insulating tape.
The soft iron laminations may be interlocking C-shaped laminations which interlock to form a rectangle.
The wrapped coil and the soft iron laminations may be coated in a resin or varnish.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which: Figure 1 is a top plan view of a plastics moulded bobbin body forming part of a transformer bobbin in accordance with the invention: Figure 2 is an enlarged section of the line 2-2 shown in Figure 1; Figure 3 is a side view of the bobbin illustrated in Figure 1; Figure 4 is a section on the line 4-4 shown in Figure 3; Figure 5 is a section on the line 5-5 shown in Figure 3; Figure 6 is a section on the line 6-6 shown in Figure 5; and Figures 7to 16 illustrate a method of formating the transformer bobbin illustrated in Figures 1 to 6.
Referring to Figures 1 to 6, there is shown a transformer bobbin 10 comprising a moulded bobbin body 12 formed of an electrically insulating material. The body 12 comprisesa central coil part 14and two terminal blocks 16, as shown. As can be seen from Figure 3, the body 14 is provided with an aperture 20 so that the body 14 is in effect hollow.
Figure 3 also shows one terminal pin 22 having one arm 24 bent at right angles to the other arm 26.
Figure 1 shows 14 terminal pins 22 and particularly the arms 24 of the pins 22. The pins 22 are arranged in two banks of seven on the terminal blocks 16, 18.
Figure 2 illustrates most clearly how the two arms 24, 26 of the terminal pin 22 extend at substantially 90" to each other in a moulded aperture 28 in the terminal block 16. It will be seen that the arm 24 is provided with a locking kink 30 which is formed by a doubled portion of the arm 24 as illustrated. The locking kink 30 rests on a shoulder portion 32 of the terminal block 16 and combines with the other arm 26, which engages with a surface 34 of the terminal block 16, to lock the terminal pin 22 in position. More specifically, it will be apparent that the terminal pin 22 cannot be pulled upwardly as shown in Figure 2 because the arm 26 is in engagement with the portion 34, and the pin 22 cannot be pulled downwardly because the locking kink 30 is in engagement with the shoulder portion 32.Sideways rotation of the pin 22 is prevented because the arm 26 is in a recessed portion 36 as shown in Figures 3 and 4.
The body 14 is formed with three flanges 38,40,42 as best seen in Figure 5. These flanges 38,40,42 provide two channels 44,46 into which coils (not shown) may be wound. Then the coils may be covered in an insulating tape and then a plurality of soft iron laminations (not shown) may be provided in the channel 48 which, as shown in FigureS, extends at right angles to the channels 44, 46. The laminations may be C-shaped and they may have interdigitated fingers so that the completed laminations are rectangular in plan. The entire laminations and the tape covering the coils may be coated in a resin or varnish.
Referring now to Figures 7 to 16, a method will now be described for forming the transformer bobbin 10 illustrated in Figure 1. For simplicity of illustration, Figures 7 to 13 only illustrate the formation of one terminal pin in its part of a terminal block.
Figure 7 illustrates a wire 50, which is to be used forforming the terminal pin, being passed buy a feeder 52 through a sleeve 54 in a machine. The sleeve 54 is provided with a retainer device 56 for holding the wire 50 in position. The sleeve is also provided with a wire cropper 58. The wire 50 is designed to be passed between a pair of jaws 60,62 and to a hole 64 in a terminal block 66.
Figure 8 shows that the sleeve 54 has been moved forward and the retaining device 56 has moved to the left as shown in Figure 8 to clamp the wire 50 in the sleeve 54. Figure 8 also shows that the feeder 52 has moved upwardly. A nose 68 of the sleeve 54 passes between the two jaws 60, 62, which jaws 60, 62 are opened as shown.
In Figure 9, the retaining device 56 is moved to the right in the sleeve 54 and away from its wire holding position. The feeder 52 moves downwardly as shown and forces the wire 50 through the sleeve 54 and into the hole 64 in the terminal block 66. As the wire 50 is moved forward, it passes through a hole 70 (see Figure 8) in the wire cropper 58.
In Figure 10, the jaws 60,62 come together to clamp the wire 50 and hold it in position in the terminal block 66. When this has happened, the sleeve 54 retracts to its first position shown in Figure 7.
Referring now to Figure 11, a pair of forming jaws 72,74 are brought up to engage the wire as shown.
The forming jaw 72 has a nose 76 and the forming jaw 74 has a complementary recess 78. The wire is deformed as shown by being bent outwardly and into the recess 78. During this deforming operation, the wire 66 is slightly withdrawn from the hole 64 in the terminal block 66 as can be seen by comparing the position of the wire 50 in the hole 64 in Figures 10 and 11.
Referring now to Figure 12, it will be seen that the forming jaws 72,74 are withdrawn to leave the wire 50 with a kink 80.
Referring now to Figure 13, the feeder 52 separates into a pair of constituent jaws 82, 84 to release the wire 50 and the sleeve 54 moves downwardly to the position shown in Figure 8 and in doing so further kinks the kink 80 to provide a fully formed locking kink 86 at the appropriately desired position which is in a formed recess in the top of the terminal block 66.
In Figure 14, the jaws 82,84 of the feeder 52 re-engage the wire 50, and the wire cropped 58 moves to the left as shown in Figure 14to cut out a section 88 of the wire 50. This section 88 can drop from the hole 70 in the wire cropper 58 and can be thrown to waste.
Figure 15 shows the wire cropper 58 returned to its original position in which the hole 70 is clearfor receiving the free end 90 of the wire 50.
In Figure 16, the sleeve 54 is moved upwardly as shown to leave a cut-off section 92 of the wire 50 in the terminal block 66 with the locking kink 86. This locking kink 86 is the same as the locking kink 30 as shown in Figure 2. The portion of the cut off section 92 above the locking kink 86 thus corresponds to the arm 24 of the locking pin 22 illustrated in Figure 2.
The portion of the cut off section 92 below the kink 86 is then bent through substantially 90Q, for exam ple by a forming blade (not shown) ta form the arm 26 shown in Figure 2. The thus kinked and bent cut off section 92 of the wire 50 forms the terminal pin 22 shown in Figure 2.
It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected. Thus, for example, with regard to Figures 7 to 16, seven wires 50 arranged side by side would normally be fed into one terminal block 16. The coil 20 could then be turned through 180 and seven wires 50 could then be fed into the other terminal block 18. Bending through the substantial 90 angle as described above with reference to Figure 16 would normally be effected when both terminal blocks 16 and 18 are provided with kinked cut off sections 92. Obviously more or less than 14 terminal pins can be formed in this way.
CLAIMS (Filed on 5/8183) 1. A transformer bobbin having at least one self-locking terminal pin, the terminal pin being bent through substantially 90 so that it has a pair of arms extending at substantially 90" to each other, and one of the arms of the terminal pin being provided with a locking kink which combines with the other of the arms of the terminal pin to Iocktheterminal pin in position.
2. A transformer bobbin according to Claim 1 in which the locking kink is formed by a doubled portion of the terminal pin.
3. A transformer bobbin according to Claim 1 or Claim 2 in which there are twelve self-locking terminal pins.
4. A transformer bobbin according to any one of the preceding claims in which the or each terminal pin is made from electro solder coated copper wire.
5. A transformer bobbin according to Claim 1 which comprises a moulded bobbin body formed of an electrically insulating material, the said at least one self-locking terminal pin being mounted on the moulded bobbin body, a coil wound around a central core part of the moulded bobbin body, and soft iron laminations supported by the moulded bobbin body.
6. A transformer bobbin according to Claim 5 in which the coil is wrapped in an insulating tape.
7. Atransformer bobbin according to Claim 5 or Claim 6 in which the soft iron laminations are interlocking C-shaped laminations which interlock to form a rectangle.
8. A transformer bobbin according to Claim 7 in which the wrapped coil and the soft iron laminations are coated in a resin or a varnish.
9. Atransformer bobbin substantially as herein described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    terminal block 66. When this has happened, the sleeve 54 retracts to its first position shown in Figure 7.
    Referring now to Figure 11, a pair of forming jaws 72,74 are brought up to engage the wire as shown.
    The forming jaw 72 has a nose 76 and the forming jaw 74 has a complementary recess 78. The wire is deformed as shown by being bent outwardly and into the recess 78. During this deforming operation, the wire 66 is slightly withdrawn from the hole 64 in the terminal block 66 as can be seen by comparing the position of the wire 50 in the hole 64 in Figures 10 and 11.
    Referring now to Figure 12, it will be seen that the forming jaws 72,74 are withdrawn to leave the wire 50 with a kink 80.
    Referring now to Figure 13, the feeder 52 separates into a pair of constituent jaws 82, 84 to release the wire 50 and the sleeve 54 moves downwardly to the position shown in Figure 8 and in doing so further kinks the kink 80 to provide a fully formed locking kink 86 at the appropriately desired position which is in a formed recess in the top of the terminal block 66.
    In Figure 14, the jaws 82,84 of the feeder 52 re-engage the wire 50, and the wire cropped 58 moves to the left as shown in Figure 14to cut out a section 88 of the wire 50. This section 88 can drop from the hole 70 in the wire cropper 58 and can be thrown to waste.
    Figure 15 shows the wire cropper 58 returned to its original position in which the hole 70 is clearfor receiving the free end 90 of the wire 50.
    In Figure 16, the sleeve 54 is moved upwardly as shown to leave a cut-off section 92 of the wire 50 in the terminal block 66 with the locking kink 86. This locking kink 86 is the same as the locking kink 30 as shown in Figure 2. The portion of the cut off section 92 above the locking kink 86 thus corresponds to the arm 24 of the locking pin 22 illustrated in Figure 2.
    The portion of the cut off section 92 below the kink 86 is then bent through substantially 90Q, for exam ple by a forming blade (not shown) ta form the arm 26 shown in Figure 2. The thus kinked and bent cut off section 92 of the wire 50 forms the terminal pin 22 shown in Figure 2.
    It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected. Thus, for example, with regard to Figures 7 to 16, seven wires 50 arranged side by side would normally be fed into one terminal block 16. The coil
    20 could then be turned through 180 and seven wires 50 could then be fed into the other terminal block 18. Bending through the substantial 90 angle as described above with reference to Figure 16 would normally be effected when both terminal blocks 16 and 18 are provided with kinked cut off sections 92. Obviously more or less than 14 terminal pins can be formed in this way.
    CLAIMS (Filed on 5/8183) 1. A transformer bobbin having at least one self-locking terminal pin, the terminal pin being bent through substantially 90 so that it has a pair of arms extending at substantially 90" to each other, and one of the arms of the terminal pin being provided with a locking kink which combines with the other of the arms of the terminal pin to Iocktheterminal pin in position.
  2. 2. A transformer bobbin according to Claim 1 in which the locking kink is formed by a doubled portion of the terminal pin.
  3. 3. A transformer bobbin according to Claim 1 or Claim 2 in which there are twelve self-locking terminal pins.
  4. 4. A transformer bobbin according to any one of the preceding claims in which the or each terminal pin is made from electro solder coated copper wire.
  5. 5. A transformer bobbin according to Claim 1 which comprises a moulded bobbin body formed of an electrically insulating material, the said at least one self-locking terminal pin being mounted on the moulded bobbin body, a coil wound around a central core part of the moulded bobbin body, and soft iron laminations supported by the moulded bobbin body.
  6. 6. A transformer bobbin according to Claim 5 in which the coil is wrapped in an insulating tape.
  7. 7. Atransformer bobbin according to Claim 5 or Claim 6 in which the soft iron laminations are interlocking C-shaped laminations which interlock to form a rectangle.
  8. 8. A transformer bobbin according to Claim 7 in which the wrapped coil and the soft iron laminations are coated in a resin or a varnish.
  9. 9. Atransformer bobbin substantially as herein described with reference to the accompanying drawings.
GB08231822A 1982-11-08 1982-11-08 A transformer bobbin Expired GB2129772B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08231822A GB2129772B (en) 1982-11-08 1982-11-08 A transformer bobbin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08231822A GB2129772B (en) 1982-11-08 1982-11-08 A transformer bobbin

Publications (2)

Publication Number Publication Date
GB2129772A true GB2129772A (en) 1984-05-23
GB2129772B GB2129772B (en) 1986-03-26

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GB08231822A Expired GB2129772B (en) 1982-11-08 1982-11-08 A transformer bobbin

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291909A1 (en) * 1987-05-19 1988-11-23 Siemens Aktiengesellschaft Electric component and method of manufacturing same
EP0415643A2 (en) * 1989-08-31 1991-03-06 AT&T Corp. Terminal assembly for linear magnetic component bobbin
EP0482694B1 (en) * 1990-10-24 1994-08-10 Koninklijke Philips Electronics N.V. Coil former comprising right-angled terminal pins
WO2005004176A1 (en) * 2003-07-04 2005-01-13 Matsushita Electric Industrial Co., Ltd. High-frequency heating device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1509889A (en) * 1976-04-21 1978-05-04 Siemens Ag Coil former assemblies
GB2004705A (en) * 1977-09-15 1979-04-04 Siemens Ag Coil former assemblies
GB1549016A (en) * 1975-06-12 1979-08-01 Siemens Ag Methods of securing electrical connection pins during injection moulding of a coil former

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1549016A (en) * 1975-06-12 1979-08-01 Siemens Ag Methods of securing electrical connection pins during injection moulding of a coil former
GB1509889A (en) * 1976-04-21 1978-05-04 Siemens Ag Coil former assemblies
GB2004705A (en) * 1977-09-15 1979-04-04 Siemens Ag Coil former assemblies

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291909A1 (en) * 1987-05-19 1988-11-23 Siemens Aktiengesellschaft Electric component and method of manufacturing same
EP0415643A2 (en) * 1989-08-31 1991-03-06 AT&T Corp. Terminal assembly for linear magnetic component bobbin
EP0415643A3 (en) * 1989-08-31 1992-05-27 American Telephone And Telegraph Company Terminal assembly for linear magnetic component bobbin
EP0482694B1 (en) * 1990-10-24 1994-08-10 Koninklijke Philips Electronics N.V. Coil former comprising right-angled terminal pins
WO2005004176A1 (en) * 2003-07-04 2005-01-13 Matsushita Electric Industrial Co., Ltd. High-frequency heating device
CN1806301B (en) * 2003-07-04 2010-04-14 松下电器产业株式会社 High-frequency heating device

Also Published As

Publication number Publication date
GB2129772B (en) 1986-03-26

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee
PCNP Patent ceased through non-payment of renewal fee

Free format text: DELETE IN JOURNAL 5235 PAGE 2245

732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921108