US3044127A - Electrical element and method of insulating same - Google Patents

Electrical element and method of insulating same Download PDF

Info

Publication number
US3044127A
US3044127A US788100A US78810059A US3044127A US 3044127 A US3044127 A US 3044127A US 788100 A US788100 A US 788100A US 78810059 A US78810059 A US 78810059A US 3044127 A US3044127 A US 3044127A
Authority
US
United States
Prior art keywords
mold
support
connector
assembly
insulating
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
US788100A
Inventor
John M Alden
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US788100A priority Critical patent/US3044127A/en
Application granted granted Critical
Publication of US3044127A publication Critical patent/US3044127A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors

Definitions

  • Injection molding with plastic insulation appears highly preferable because of the better sealing action, much faster injection and curing speed and the smooth, compact appearance of the product.
  • high pressures are needed to force the fluid plastic into a mold and around the components, and such high pressures disarrange the elements with respect to each other and the walls of the mold cavity. The result has been that the components are not properly located in the cavity, and an insuflicient thickness of insulation is formed around them.
  • a method of encasing an electrical element in insulation comprises, fitting a separate support in a mold, placing an electrical element on the support to securely position the element in the mold, closing the mold, injecting insulation into the mold at least partially to encase the element, and subsequently separating the encased element and support from the mold.
  • the support is formed of a primary covering of a fusible material compatible with a secondary encasing material.
  • the support may be molded on a part of the element prior to secondary encasement, or the primary covering may be formed separately and applied to the element prior to putting it in the mold for secondary encasement.
  • FIG. 1 is an end elevation of a mold
  • FIG. 2 is a side elevation of one-half the mold
  • FIG. 3 is an enlarged fragmentary side elevation of the mold showing a resistor and connector supported therein;
  • FIG. 4 is a section on line 44 of FIG. 3;
  • FIG. 5 is an elevation like FIG. 3, showing the encased resistor and connector
  • FIG. 6 is a section on line 6-6of FIG. 5;
  • FIG. 7 is a section on line 7-7 of FIG. 6;
  • FIG. 8 is a side view of the encased element
  • FIG. 9 is a bottom view of the encased element
  • FIG. 10 is a side elevation of a primary mold half showing an assembly of resistors, a connector and an insulated wire therein;
  • FIG. 11 is a side elevation of the assembly partially encased in a support
  • FIG. 12 is a side elevation of a secondary mold half with the supported assembly therein;
  • FIG. 13 is a side view of the assembly insulated by the steps of FIGS. 1( to 12;
  • FIG. 14 is a section on line 14-14 of FIG. 13;
  • FIG. 15 is a section on line 15--15 of FIG. 12;
  • FIG. -16 is a left end elevation of a preformed support
  • FIG. 17 is a right end elevation of the preformed support
  • FIG. 18 is a side elevation of the preformed support shown partly in section, and with an assembly resistor, a terminal and insulated wires'connected thereto;
  • FIG. 19 is a side elevation of a mold half with the preformed support and assembly therein;
  • FIG. 20 is a section on line 2020 of FIG. 19;
  • FIG. 21 is a side elevation of the encased preformed support and assembly
  • FIG. 22 is an end elevation of a two part support
  • FIG. 23 is a section on line 23-23 of FIG. 22;
  • FIG. 24 is a plan view of the two part support
  • FIG. 25 is a section of a mold half with the two part support holding a connector and lead therein;
  • FIG. 26 is a side elevation showing the encased two part support and connector.
  • FIG. 27 is an isometric view of the connector and lead I ing two halves 11a and 11b, each of which comprises a cavity with a semicylindrical horizontal chamber 12, vertical chamber 13, and wire passage 14 and entrance 16.
  • the vertical chamber 13 is adapted to receive a cylindrical support plug 17 having an upwardly extending tubular wall 18' within which is located a stub 19.
  • the stub 19 is generally cylindrical, as best shown in FIG; 6, and spaced inwardly of the wall 18, except for two "ears 21 which abut the wall, thereby defining two arcuate spaces between the wall and stub.
  • the plug 17 is adapted to support the tube cap connector 1 with its jaws 2 fitting in the arcuate spaces of the plug and with its connector portion 3 resting-on top of the stub 19.
  • the stub covers the lower end of its jaws and the underside of the connector portion.
  • the insulation is gripped in the passage 14, and the resistor is gripped between two pairs ofstuds 15 whose ends are shaped to extend slightly around the sides and ends of the resistor 6.
  • the insulated wire, resistor and connector are then positively located in the cavity with the tubular walls 18 of the plug 17 sealing off the connector jaws 2.
  • a hot, fluid, insulating plastic such as polyethylene, vinyl resins or nylon, is injected through the opening 16 at a high pressure, for example 1200 psi. so as to flow around all exposed parts of the connector assembly and form the jacket 26 of FIGS. 8 and 9.
  • An insulating material compatible with the insulation on the wire 8 will form a homogeneous bond therewith and permanently embed the wire end in the jacket and seal the assembly against moisture, contamination and leakage.
  • the jacketed assembly is removed from the mold together with the plug and are thereafter separated.
  • the jacket and connector assembly are thereby molded as a unit with a single injection shot. .Since the connector assembly is also embedded in the jacket, excellent strain relief is provided for the leads, minimizing wire and solder joint fratigue under vibration and shock.
  • the connector is seated in the jacket, but its jaws are free from accidental coating owing to the sealing otf effect of the plug walls 18.
  • FIGS. to 16 Another way of insulating a connector assembly is shown in FIGS. to 16, whereinthe assembly comprises a connector pin 31 havinga contact portion 32 and connector portion 33 connectedto a series of resistors 6 with leads 4 and an insulated wire 8.
  • the assembly is located in a first mold of which one half 34a is shown in 51G. 10.
  • V the rectangular recess 88.
  • the first mold comprises a horizontal chamber 36 with opposite end openings 37 and 38, three semi-cylindrical vertical recesses, two horizontal cylindrical recesses 41, and three studs 4-2 having concave upper surfaces complementary to the resistors 6. When the mold halvesare clamped together the resistors are seated on the studs 42.
  • a first on primary jacket 46 isformed by injecting hot plastic under high pressure as described above.
  • the first jacket has vertical bosses formed by the recesses 39, and horizontal bosses 48 formed by recesses 41.
  • Recesses 49 exposing the resistors 6 are'formed by the studs 42 as shown in FIGS. 11, 12 and 15.
  • An annular bossStl is formed at the enlarged right end of chamber 36.
  • the first jacket 46 forms a support-for the connectorresistor assembly in a second mold of whose halves 51a and 51b are shown in FIG. 12.
  • the second mold has a horizontal chamber 52 with end passages 53 and 54.
  • the contact portion 32 of the pin 31 is held in one end opening 53 with its connector portion 33 extending into "the chamber 52.
  • the bosses 56 fuses with the inner jacket 46 and completes the ena casing of the connector assembly.
  • the pin 31 is em: bedded in the matrix, and the'openings '49 to the resistors 6 areclosed.
  • the bosses 47, 48 and 50 having served their purpose of holding the jacketed assembly in position.
  • the first or primary jacket 61 may be preformed prior to the assembly of elements therein.
  • a generally cylindrical body of plastic insulating material formed with lengthwise cylindrical chambers 62, connecting passages 63 between the chambers, and upper and lower bosses 64.
  • One or-more resistors 6-and insulated wires 66 are inserted in the chambers 62, and solder connected to a pin jack 67 after their lead wires 68 are passed through a wall 71 at the right end of the primary jacket; The jack 67 is positioned against an axial boss 72.
  • the primary jacket supports the assembly of "wires, resistors and jack in a mold 73 shown'in FIGS. 19 and 20, comprising halves 73a and 73b.
  • Thehalves form a main chamber 74 having upper and lower recesses 76 receiving the bosses 64 of the jacket.
  • a separable mold member is held in a ribbed chamber 78 by attachment to the mold; The inner end of the member has a tip (not Thus when a matrix molten plastic is forced shown) over which the jack 67 V fits.
  • the boss 72 prevents preformed support as indicated in FIG. 17 thereby forming an integral unit.
  • each jack 81 is formed by punch-press techniques from resilientsheet metal and has a triangular socket portionBZ from which a rectanwire entrance 87 the two-part body forms a'wall 91 having a small passage 92 communicating with the recess 39 and a larger passage communicating with the wire entrance 87.
  • the jacks 81 and wires are supported in a two-part mold 96a-96b by'clamping the two-part support86a-86b therein having first fitted the jacks and wires in the two part body.
  • the wires and jacks may be joined prior to placing them in the support.
  • the insulation of wire 85 fills the enlarged passage 93 closing oif the recess 88 and channel 89 from the wire entrance 87 as shown in MG. 25.
  • the mold 96a--96b has a main chamber 97 and a smaller chamber 98 which is filled by the two-part support 86a86b.
  • the wall 91 of the support closes oft" the smaller chamber .98 from the main chamber 97.
  • the present method insuresthat the various circuit elements will be positioned properly in their insulating casing despite the high pressure faces tending to dislocate them in the mold.
  • the injected matrix or casing not only afiords rigid support, resistance against breakage from shock and vibration and complete sealing against moisture, dust and electrical leakage, but also it is a far more speedy, inexpensive and convenient operation. 1
  • the methodof encasing in insulation an electrical element of relatively large Width having a lead of relatively smaller width connected thereto which comprises locating the element in an insulating support having two parts forming a chamber of a size to receive said element and a Wall at one end of said chamber having a smaller opening therefrom for said lead, said well facing toward said element and away from said lead so as to engage the element against movement axially of the lead, placing the insulating support, element and lead in a mold 'so that the support is engaged by the mold thereby positively to locate the element in the mold, simultaneously clamping in the mold a portion of the lead spaced from the element so that the element and said lead portion are mechanically engaged without further preparation such that the intermediate portion of the lead is positively held against dislocation by pressure of insulation injected in the mold, and injecting an insulating coating over said support.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

July 17, 1962 J. M. ALDEN 3,044,127
ELECTRICAL ELEMENT AND METHOD OF INSULATING SAME Filed Jan. 21, 1959 4 Sheets-Sheet 1 H fl I! H ii 52% W H Q AM 1/ \\mu 1/ 24 a 1/ '9 A46 2 31 2 4W j [an ry/107' Ja/wM 02% 2% 9 1 f @172;
July 17, 1962 J. M. ALDEN 3,044,127
ELECTRICAL ELEMENT AND METHOD OF INSULATING SAME Filed Jan. 21, 1959 4 Sheets-Sheet 2 July 17, 1962 J. M. ALDEN 3, 4
ELECTRICAL ELEMENT AND METHOD OF INSULATING SAME Filed Jan. 21, 1959 4 Sheets-Sheet 3 July 17, 1962 J. M. ALDEN 3,044,127
ELECTRICAL ELEMENT AND METHOD OF INSULATING SAME Filed Jan. 21, 1959 4 SheetsSheet 4 ar 1 l an r gay .2;
States 3,044,127 ELECTRICAL ELEMENT AND WTHGD F INSULATING SAL m John M. Alden, 380 Grove St., Needham, Mass. Filed Jan. 21, 1959, Ser. No. 788,101 1 Claim. (Cl. 1854) UIIII of the finished product. Potting is inherently a low pressure process and. does not form a strong seal around the elements. Since no closed mold is involved it results in a poorly formed external and bulky appearance. Furthermore, the process requires careful attention of the operator and is slow as a result of the time required for potting and curing.
Injection molding with plastic insulation appears highly preferable because of the better sealing action, much faster injection and curing speed and the smooth, compact appearance of the product. However, high pressures are needed to force the fluid plastic into a mold and around the components, and such high pressures disarrange the elements with respect to each other and the walls of the mold cavity. The result has been that the components are not properly located in the cavity, and an insuflicient thickness of insulation is formed around them.
According to the present invention a method of encasing an electrical element in insulation comprises, fitting a separate support in a mold, placing an electrical element on the support to securely position the element in the mold, closing the mold, injecting insulation into the mold at least partially to encase the element, and subsequently separating the encased element and support from the mold.
Preferably the support is formed of a primary covering of a fusible material compatible with a secondary encasing material. The support may be molded on a part of the element prior to secondary encasement, or the primary covering may be formed separately and applied to the element prior to putting it in the mold for secondary encasement.
For the purpose of illustration typical methods are illustrated in the accompanying drawings in which:
FIG. 1 is an end elevation of a mold;
FIG. 2 is a side elevation of one-half the mold;
FIG. 3 is an enlarged fragmentary side elevation of the mold showing a resistor and connector supported therein;
FIG. 4 is a section on line 44 of FIG. 3;
FIG. 5 is an elevation like FIG. 3, showing the encased resistor and connector;
FIG. 6 is a section on line 6-6of FIG. 5;
FIG. 7 is a section on line 7-7 of FIG. 6;
FIG. 8 is a side view of the encased element;
FIG. 9 is a bottom view of the encased element;
FIG. 10 is a side elevation of a primary mold half showing an assembly of resistors, a connector and an insulated wire therein;
FIG. 11 is a side elevation of the assembly partially encased in a support;
FIG. 12 is a side elevation of a secondary mold half with the supported assembly therein;
FIG. 13 is a side view of the assembly insulated by the steps of FIGS. 1( to 12;
FIG. 14 is a section on line 14-14 of FIG. 13;
atent G FIG. 15 is a section on line 15--15 of FIG. 12;
FIG. -16 is a left end elevation of a preformed support;
FIG. 17 is a right end elevation of the preformed support;
FIG. 18 is a side elevation of the preformed support shown partly in section, and with an assembly resistor, a terminal and insulated wires'connected thereto;
FIG. 19 is a side elevation of a mold half with the preformed support and assembly therein;
FIG. 20 is a section on line 2020 of FIG. 19;
FIG. 21 is a side elevation of the encased preformed support and assembly;
FIG. 22 is an end elevation of a two part support;
FIG. 23 is a section on line 23-23 of FIG. 22;
FIG. 24 is a plan view of the two part support;
FIG. 25 is a section of a mold half with the two part support holding a connector and lead therein;
FIG. 26 is a side elevation showing the encased two part support and connector; and
FIG. 27 is an isometric view of the connector and lead I ing two halves 11a and 11b, each of which comprises a cavity with a semicylindrical horizontal chamber 12, vertical chamber 13, and wire passage 14 and entrance 16. The vertical chamber 13 is adapted to receive a cylindrical support plug 17 having an upwardly extending tubular wall 18' within which is located a stub 19. The stub 19 is generally cylindrical, as best shown in FIG; 6, and spaced inwardly of the wall 18, except for two "ears 21 which abut the wall, thereby defining two arcuate spaces between the wall and stub.
The plug 17 is adapted to support the tube cap connector 1 with its jaws 2 fitting in the arcuate spaces of the plug and with its connector portion 3 resting-on top of the stub 19. In addition to supporting the connector, the stub covers the lower end of its jaws and the underside of the connector portion.
When the connector is fitted on the plug the connector and plug are placed in one mold half with the resistor 6 in the horizontalchamber 12 and the insulated Wire extending from the passage 14 into the horizontal chamber 12.
When the mold halves are clamped together in a conven-- tional manner, the insulation is gripped in the passage 14, and the resistor is gripped between two pairs ofstuds 15 whose ends are shaped to extend slightly around the sides and ends of the resistor 6. The insulated wire, resistor and connector are then positively located in the cavity with the tubular walls 18 of the plug 17 sealing off the connector jaws 2.
I A hot, fluid, insulating plastic, such as polyethylene, vinyl resins or nylon, is injected through the opening 16 at a high pressure, for example 1200 psi. so as to flow around all exposed parts of the connector assembly and form the jacket 26 of FIGS. 8 and 9. An insulating material compatible with the insulation on the wire 8 will form a homogeneous bond therewith and permanently embed the wire end in the jacket and seal the assembly against moisture, contamination and leakage. The jacketed assembly is removed from the mold together with the plug and are thereafter separated.
The jacket and connector assembly are thereby molded as a unit with a single injection shot. .Since the connector assembly is also embedded in the jacket, excellent strain relief is provided for the leads, minimizing wire and solder joint fratigue under vibration and shock. The connector is seated in the jacket, but its jaws are free from accidental coating owing to the sealing otf effect of the plug walls 18.
Another way of insulating a connector assembly is shown in FIGS. to 16, whereinthe assembly comprises a connector pin 31 havinga contact portion 32 and connector portion 33 connectedto a series of resistors 6 with leads 4 and an insulated wire 8. The assembly is located in a first mold of which one half 34a is shown in 51G. 10.
V the rectangular recess 88. Between each channel 39 and The first mold comprises a horizontal chamber 36 with opposite end openings 37 and 38, three semi-cylindrical vertical recesses, two horizontal cylindrical recesses 41, and three studs 4-2 having concave upper surfaces complementary to the resistors 6. When the mold halvesare clamped together the resistors are seated on the studs 42.
A first on primary jacket 46 isformed by injecting hot plastic under high pressure as described above. The first jacket has vertical bosses formed by the recesses 39, and horizontal bosses 48 formed by recesses 41. Recesses 49 exposing the resistors 6 are'formed by the studs 42 as shown in FIGS. 11, 12 and 15. An annular bossStl is formed at the enlarged right end of chamber 36.
The first jacket 46 forms a support-for the connectorresistor assembly in a second mold of whose halves 51a and 51b are shown in FIG. 12. The second mold has a horizontal chamber 52 with end passages 53 and 54. The contact portion 32 of the pin 31 is held in one end opening 53 with its connector portion 33 extending into "the chamber 52. In the second mold 51a'51b the bosses 56 fuses with the inner jacket 46 and completes the ena casing of the connector assembly. The pin 31 is em: bedded in the matrix, and the'openings '49 to the resistors 6 areclosed. The bosses 47, 48 and 50 having served their purpose of holding the jacketed assembly in position.
are merged with the outer jacket.
' As shown in FIGS. 17 to 21 the first or primary jacket 61 may be preformed prior to the assembly of elements therein. In FIGS. 16 to the primary jacket is a generally cylindrical body of plastic insulating material formed with lengthwise cylindrical chambers 62, connecting passages 63 between the chambers, and upper and lower bosses 64. One or-more resistors 6-and insulated wires 66 are inserted in the chambers 62, and solder connected to a pin jack 67 after their lead wires 68 are passed through a wall 71 at the right end of the primary jacket; The jack 67 is positioned against an axial boss 72. g
The primary jacket supports the assembly of "wires, resistors and jack in a mold 73 shown'in FIGS. 19 and 20, comprising halves 73a and 73b. Thehalves form a main chamber 74 having upper and lower recesses 76 receiving the bosses 64 of the jacket. A separable mold member is held in a ribbed chamber 78 by attachment to the mold; The inner end of the member has a tip (not Thus when a matrix molten plastic is forced shown) over which the jack 67 V fits. The boss 72 prevents preformed support as indicated in FIG. 17 thereby forming an integral unit.
In FIGS. 22 to 26 is shown a method of supporting an electrical jack 81, elements in a two-part preformed body gular base 83 extends at one end, and at the other end a lug -84 to which the conductor of an insulated wire 85 is 7 86a, 86b. As shown in FIG. 27, each jack 81 is formed by punch-press techniques from resilientsheet metal and has a triangular socket portionBZ from which a rectanwire entrance 87 the two-part body forms a'wall 91 having a small passage 92 communicating with the recess 39 and a larger passage communicating with the wire entrance 87.
As shown in FIG-25 the jacks 81 and wires are supported in a two-part mold 96a-96b by'clamping the two-part support86a-86b therein having first fitted the jacks and wires in the two part body. The wires and jacks may be joined prior to placing them in the support. When in the support the insulation of wire 85 fills the enlarged passage 93 closing oif the recess 88 and channel 89 from the wire entrance 87 as shown in MG. 25.
The mold 96a--96b has a main chamber 97 and a smaller chamber 98 which is filled by the two-part support 86a86b. The wall 91 of the supportcloses oft" the smaller chamber .98 from the main chamber 97. Thus when a matrix 99 of hot plastic, under high pressure, is injected in the mold, the support not only holds the clip and wire firmly positioned, but also restricts the matrix to covering the wire 35 and the part of the support to the right of the wall 91, so that the matrix does not reach the jack 81. e
From the foregoing description it can be seen that the present method insuresthat the various circuit elements will be positioned properly in their insulating casing despite the high pressure faces tending to dislocate them in the mold. The injected matrix or casing not only afiords rigid support, resistance against breakage from shock and vibration and complete sealing against moisture, dust and electrical leakage, but also it is a far more speedy, inexpensive and convenient operation. 1
While I have shown several specific methods by which the advantages of injection molding can be fully realized, it should be understood the steps illustrated may be com bined in other and equivalent ways within the scope of the appended claim.
I claim: The methodof encasing in insulation an electrical element of relatively large Width having a lead of relatively smaller width connected thereto which comprises locating the element in an insulating support having two parts forming a chamber of a size to receive said element and a Wall at one end of said chamber having a smaller opening therefrom for said lead, said well facing toward said element and away from said lead so as to engage the element against movement axially of the lead, placing the insulating support, element and lead in a mold 'so that the support is engaged by the mold thereby positively to locate the element in the mold, simultaneously clamping in the mold a portion of the lead spaced from the element so that the element and said lead portion are mechanically engaged without further preparation such that the intermediate portion of the lead is positively held against dislocation by pressure of insulation injected in the mold, and injecting an insulating coating over said support.
ReferencesCited in the file of this patent UNITED STATES PATENTS 2,713,700 Fisher Ju1y 26, 1955 2,747,230 Magnus May 29, '1956 2,856,639 Forrest et al Oct. 21, 1958 FOREIGN PATENTS 211,774v Australia Janfll, 1957 657,821
Great Britain Sept. 26, 1951
US788100A 1959-01-21 1959-01-21 Electrical element and method of insulating same Expired - Lifetime US3044127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US788100A US3044127A (en) 1959-01-21 1959-01-21 Electrical element and method of insulating same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US788100A US3044127A (en) 1959-01-21 1959-01-21 Electrical element and method of insulating same

Publications (1)

Publication Number Publication Date
US3044127A true US3044127A (en) 1962-07-17

Family

ID=25143449

Family Applications (1)

Application Number Title Priority Date Filing Date
US788100A Expired - Lifetime US3044127A (en) 1959-01-21 1959-01-21 Electrical element and method of insulating same

Country Status (1)

Country Link
US (1) US3044127A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201855A (en) * 1961-02-21 1965-08-24 Dale Electronics Electrical resistor and method of making same
US3344468A (en) * 1964-06-11 1967-10-03 Ernest P Moslo Centering insert for golf ball molding
US3363040A (en) * 1965-10-12 1968-01-09 Aoki Katashi Apparatus and process for injection molding a plastic tray
US3421730A (en) * 1962-08-29 1969-01-14 Atlantic Richfield Co Pressure injection mold
US4179540A (en) * 1974-12-23 1979-12-18 Union Carbide Corporation Fabrication of foamed articles
US4268003A (en) * 1977-11-02 1981-05-19 Liautaud James P Mold core and method and apparatus for manufacture
US4339407A (en) * 1980-10-02 1982-07-13 Alden Research Foundation Electronic circuit encapsulation
US4377548A (en) * 1981-11-27 1983-03-22 Sprague Electric Company Method for encapsulating a radial leaded electrical component
US4461529A (en) * 1982-06-16 1984-07-24 W. L. Gore & Associates, Inc. Strain relief boot
US4481380A (en) * 1982-08-26 1984-11-06 Alden Research Foundation High voltage insulator for electrical components having telescoping insulative sleeves
US4495130A (en) * 1981-09-28 1985-01-22 Essex Group, Inc. Method of molding an electrical connector
US4556190A (en) * 1983-12-05 1985-12-03 Lyall Electric, Inc. Mold for grommet mounted connector
US4702873A (en) * 1983-03-25 1987-10-27 Ceraver, S.A. Method of manufacturing a composite insulator
US4747573A (en) * 1986-07-24 1988-05-31 Kioritz Corporation Inner mold for molding cylinder
US4865794A (en) * 1987-04-13 1989-09-12 Mitsuba Electric Manufacturing Co., Ltd. Method of integrally molding member onto portion of rigid member
US4882116A (en) * 1988-04-29 1989-11-21 Wagner Spray Tech Corporation Method of molding a label on an electrical cord
EP1061619A1 (en) * 1999-06-15 2000-12-20 Lexington Insulators A process for producing a spark plug boot resistor assembly
US6630089B2 (en) * 2001-05-18 2003-10-07 Chao-Yueh Chuang Process for forming a molded plastic layer on a metal plate
US20180272581A1 (en) * 2017-03-21 2018-09-27 Canon Kabushiki Kaisha Integral molding method and integral molding device
US11192285B2 (en) * 2019-03-06 2021-12-07 Toyota Jidosha Kabushiki Kaisha Molding method of connector portion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657821A (en) * 1948-06-28 1951-09-26 Latex Ind Ltd Improvements in or relating to the production of resilient rubber rings and articles embodying same
US2713700A (en) * 1952-09-17 1955-07-26 Astron Corp Method of producing sealed capacitors
US2747230A (en) * 1952-04-24 1956-05-29 Finn H Magnus Method for producing plastic encased articles
US2856639A (en) * 1953-04-13 1958-10-21 Bernard F Forrest Method of encasing electric coils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657821A (en) * 1948-06-28 1951-09-26 Latex Ind Ltd Improvements in or relating to the production of resilient rubber rings and articles embodying same
US2747230A (en) * 1952-04-24 1956-05-29 Finn H Magnus Method for producing plastic encased articles
US2713700A (en) * 1952-09-17 1955-07-26 Astron Corp Method of producing sealed capacitors
US2856639A (en) * 1953-04-13 1958-10-21 Bernard F Forrest Method of encasing electric coils

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201855A (en) * 1961-02-21 1965-08-24 Dale Electronics Electrical resistor and method of making same
US3421730A (en) * 1962-08-29 1969-01-14 Atlantic Richfield Co Pressure injection mold
US3344468A (en) * 1964-06-11 1967-10-03 Ernest P Moslo Centering insert for golf ball molding
US3363040A (en) * 1965-10-12 1968-01-09 Aoki Katashi Apparatus and process for injection molding a plastic tray
US4179540A (en) * 1974-12-23 1979-12-18 Union Carbide Corporation Fabrication of foamed articles
US4268003A (en) * 1977-11-02 1981-05-19 Liautaud James P Mold core and method and apparatus for manufacture
US4339407A (en) * 1980-10-02 1982-07-13 Alden Research Foundation Electronic circuit encapsulation
US4495130A (en) * 1981-09-28 1985-01-22 Essex Group, Inc. Method of molding an electrical connector
US4377548A (en) * 1981-11-27 1983-03-22 Sprague Electric Company Method for encapsulating a radial leaded electrical component
US4461529A (en) * 1982-06-16 1984-07-24 W. L. Gore & Associates, Inc. Strain relief boot
US4481380A (en) * 1982-08-26 1984-11-06 Alden Research Foundation High voltage insulator for electrical components having telescoping insulative sleeves
US4702873A (en) * 1983-03-25 1987-10-27 Ceraver, S.A. Method of manufacturing a composite insulator
US4556190A (en) * 1983-12-05 1985-12-03 Lyall Electric, Inc. Mold for grommet mounted connector
US4747573A (en) * 1986-07-24 1988-05-31 Kioritz Corporation Inner mold for molding cylinder
US4865794A (en) * 1987-04-13 1989-09-12 Mitsuba Electric Manufacturing Co., Ltd. Method of integrally molding member onto portion of rigid member
US4882116A (en) * 1988-04-29 1989-11-21 Wagner Spray Tech Corporation Method of molding a label on an electrical cord
EP1061619A1 (en) * 1999-06-15 2000-12-20 Lexington Insulators A process for producing a spark plug boot resistor assembly
US6793863B1 (en) 1999-06-15 2004-09-21 Lexington Insulators Process for producing a spark plug boot resistor assembly
US6630089B2 (en) * 2001-05-18 2003-10-07 Chao-Yueh Chuang Process for forming a molded plastic layer on a metal plate
US20180272581A1 (en) * 2017-03-21 2018-09-27 Canon Kabushiki Kaisha Integral molding method and integral molding device
US11192285B2 (en) * 2019-03-06 2021-12-07 Toyota Jidosha Kabushiki Kaisha Molding method of connector portion

Similar Documents

Publication Publication Date Title
US3044127A (en) Electrical element and method of insulating same
US4481380A (en) High voltage insulator for electrical components having telescoping insulative sleeves
US4339407A (en) Electronic circuit encapsulation
US3611257A (en) Electric plug construction and method of manufacturing same
US3517373A (en) Cable connector
JPS59221982A (en) Method of producing domestic molding covered power plug and device therefor
US20090017700A1 (en) Connector Assembly For An Implantable Medical Device and Process For Making
SE8106512L (en) SET AND DEVICE FOR MANUFACTURING TREATMENT AND PRESSURE, SPECIAL TEMPERATURE RESISTANCE, CONNECTIONS, ENDINGS OR CONNECTIONS
JPH04263913A (en) Resin insertion molding method of metallic material
US7124688B2 (en) Overmolded body for pyrotechnic initiator and method of molding same
US20040002260A1 (en) Insert-molded connector and method of forming it
US5453029A (en) Contact support for a molded connector
EP1174890A2 (en) Moulded coil and production method thereof
US2033643A (en) Method of making electric sockets
US2308324A (en) Electrical connector and method of manufacturing the same
GB2095924A (en) An electric plug
US4568795A (en) Insulation filled carrier of conductive components
US7260891B2 (en) Connector overmold spacer
US2975487A (en) Molding of thermoplastic materials
WO2002010594A1 (en) Manifold and method of making same
US4145805A (en) Method of making a reed relay with molded bobbin
US4298241A (en) Splicer fuse integrated in line cord plug
KR890004370A (en) Cartridge fuses and manufacturing method
CN210436532U (en) Hot runner hot nozzle joint of precise injection mold
US3451036A (en) Electrical plug