CA1149118A - Plastic injection molding machine - Google Patents

Plastic injection molding machine

Info

Publication number
CA1149118A
CA1149118A CA 371775 CA371775A CA1149118A CA 1149118 A CA1149118 A CA 1149118A CA 371775 CA371775 CA 371775 CA 371775 A CA371775 A CA 371775A CA 1149118 A CA1149118 A CA 1149118A
Authority
CA
Grant status
Grant
Patent type
Prior art keywords
part
molding
section
carrier
die
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
Application number
CA 371775
Other languages
French (fr)
Inventor
Remi Frenette
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.)
Techmire Ltd
Original Assignee
Techmire 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
Grant date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0003Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of successively moulded portions rigidly joined to each other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1615The materials being injected at different moulding stations
    • B29C45/162The materials being injected at different moulding stations using means, e.g. mould parts, for transferring an injected part between moulding stations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1615The materials being injected at different moulding stations
    • B29C45/162The materials being injected at different moulding stations using means, e.g. mould parts, for transferring an injected part between moulding stations
    • B29C2045/1623The materials being injected at different moulding stations using means, e.g. mould parts, for transferring an injected part between moulding stations transfer by a slidable element forming a part of both cavities

Abstract

ABSTRACT OF THE DISCLOSURE

A plastic injection molding machine includes a multi-configuration cavity in its dies whereby a first part and carrier are molded in one part of the die while a second part is molded over the first part in another part of the die.

Description

This invention relates to in~ection molding machines and in particular to a plastic injection apparatus for use in a moldi~ng machi'ne'i`n which'a first part is molded on to the carrier strip and transferred to a second position in a mold for the over molding of a second part.
Backgr'ound 'of the''Inven`tion There are'numer'ous products produced by the plastics industry which'have at least two parts that con-ventionally are molded separately and subsequently joined together in an assembly operation. The present invention provides a forward step in this art by molding the two parts in one operation with an interconnecting carrier or orientation strip. With the method and apparatus of the present invention, the con~entional assembly step using at least one further machine is unnecessary.
The molding of the parts with the carrier strip proves most useful in the su~sequent use of the parts as the carrier strip is used to maintain the orientation of the parts for use in their assembly or insertion in an associated device. The orientation strip therefore facilitates the assembly of small components, one with the other.
In its simplest form, the process of the present invention consists of molding a first part integrally with a carrier strip and indexing this first unit and the strip to another part of the die so that, on the ne~t ~hot, a second unit is molded over and interlocked to the first unit.
Summary of the Invention According to one aspect, the method of molding a multi-part arti~cle in a plastic iniection molding machine comprises the steps o~ molding a first part integrally with a carrier strip in one section of a die, indexing the molded strip and ~irst part to another section of the die and molding a second part over the`~irst part wh~le simultaneously molding another first part and carrier in the first part of the die.
According to another aspect, the in~ention relates to apparatus for injection molding a part integrally with a carrier strip which comprises a pair of mold halves which, when reciprocated into face to face relation, form a plurality of cavities therein. The mold halves include at least one cavity for molding a first part with an integral carrier strip and at least one other cavity in the mold for molding a second part over t~e first part. Means for transferring the first molded part and the carrier strip from the first cavity to the other cavity is also provided.
Brief Description of the Drawings The invention is illustrated ~y way o~ example in the accompanying drawings in which Figure 1 is a fragmented elevation view of an injection molding machine incorporating the present invention;
Figure 2 is an end view of the transfer means as viewed generally along the lines 2-2 of Figure l;
Figure 3 is a plan view of one of the mold halves used in the present invention; and Figure 4 is a sectional view taken along the lines 4-4 of Figure 3.
Referring to Figure 1, a plastic injection molding -machine ~ndicated generally at 10 includes a multi slide

- 2 die guide 12 of the type shown in my Canadian Patent 1,099,476 issued April 21, 1981.
Die guide 12 has a pair of slideways 14, 16 and a further pair 18, 20 at right anyles to the first pair.
As shown in Pigure 1, a pair of mold halves 22, 24 are mounted on shanks 26, 28 respectiveIy for reciprocal movement in the guideways 14 and 16 by suitable driving means, not shown. When the mold halves 22, 24 are brought together they form closed cavities therebetween for the reception of plastic injection.
Slide guideway 18 is used for the mounting of a transfer mechanism generally indicated at 30, the purpose and operation of which will be described further on in the disclosure.
Referring to Figure 3, mold half 22, like its companion half 24, not illustrated, has a ~irst section 32 with at least one cavity 34 therein for molding the firs-t part 36 of an article. Mold 22 also includes a second section 38 having at least one cavity 40 for the molding of a second part 42 on top of the first part 36. After the first part 36 is molded in the cavity 34 via injection unit 70, the part 36 is moved from the first section 32 of the mold to the second section 38 of the mold into cavity 40 where the second part 42 is molded over the first part~ also by the injection unit 70. This movement is carried out by means of a transfer blade 44 which, as shown in Figures 1 and 2, has its upper end secured in a blade clamp 46 the upper end of which is detachably connected to a linear actuator 48. Clamp 46 is provided w-ith a dove-tail shaped ~uide 50 as shown in Figure 2 which cooperates with . - 3 -~f~9~

a track 52 of similar configuration, th.is track bein~ bolted as illustrated to one side of the guidewav 18. It will be appreciated that as the linear actuator 48 is operated the clamp 46 and blade 44 are ~o~ed upwardly or downwardly along the track 52. ~t will be seen in Figure 2 that the trans~er blade 44 has a part-engaginy edge 54.
Referring now to Figures 3 and 4, it will be seen that the mold half 22 includes a track 56 for the blade 44, the part engaging edge 54 thereof ~eing adapted to be positioned in the area 58 of the mold so that, when the first part 36 is molded, the head portion 60 of the part will be molded around the edge 54 of the blade as shown in phantom line in Figure 4. Part 36 is therefore molded integrally both with a carrier strip 62 interconnecting the first parts 36 and also around the edge 54 of the transfer ~lade. After the first shot lnto the molds 22, 24 is made, forming the first parts 36, mold half 22 is opened ~to the left in its guideway 14~ the parts 36 being released from the cavities - 34 by ejector pins 64. Mold 24 is then opened (to the right ~ 20 and guideway 16) and the part~ are released therefrom by : ejector pins 64 and 66, these pins being actuated by the interaction of the mold half 24 with the pin release springs 68. Actuator 4~ is then operated to move the clamp 46 and transfer blade 44 downwardly ~as seen in Figure l? so that the parts 36 molded about the edge 54 of the blade are indexed downwardly so that they are in alignment with the cavities 40 in the second section of the mold 22, the parts 36 being maintained in proper orientation due to their ~ interconnection by the carrier strip 62 and the blade edge : 30 54. Mold 24 i~s then closed followed by mold half 22, the ,~ _ blade 44 is drawn upwardly to its ~igure 1 position by the actuator 48, the ed~e 5~ breaking away from the notch in the heads 6~ of the part. Another shot is then made into the mold cavities by the single injection unit 70, molding the second part 42 over the first part ~6 in the cavities 40 in the second section of the mold while at the same time molding another series of first parts 36 about the edge 5A
of the blade 4A. The cycle is then repeated.

While the invention has been described in connection with a specific embodiment thereof and in a speciic use, various modifications thereof will occur to those skilled in the art without depart~ng from the spirit and scope of the invention as set forth in the appended claims.
The terms and expressions which have been employed in this specification are used as terms of description and not of limitation, and there is no intention in -the use of such terms and expressions to exclude any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the in~ention claimed.

Claims (3)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A method of molding a multi-part article in a plastic injection molding machine comprising the steps of:
a) molding a first part integrally with a carrier strip in one section of a die;
b) opening the die;
c) indexing the molded strip and said first part to another section of the die; and d) molding a second part over said first part while simultaneously molding another first part and carrier in said first section of the die, both molding steps being accomplished by the same injection unit.
2. Apparatus for injection molding a part integral with a carrier strip, comprising a pair of mold halves which, when reciprocated into face to face relation, form a plurality of cavities therein; said mold halves having first and second sections including at least one cavity in said first section for molding a first part having an integral carrier strip and at least one other cavity in said second section for molding a second part over the first part; means for transferring the first molded part and carrier strip from the first cavity in the first section to the other cavity in the second section;
and a single injection unit for simultaneously injecting said first and second parts.
3. Apparatus according to Claim 2, wherein the transferring means is operative in a plane 90° to the plane of operation of said molds, said transferring means comprising a ram having a reciprocating piston rod, a transfer blade carrier secured to one end of the rod, a transfer blade having one end mounted in said carrier with the other end thereof extending downwardly for positioning between said mold halves, and a guide track in said molds for directing movement of said carrier.
CA 371775 1981-02-26 1981-02-26 Plastic injection molding machine Expired CA1149118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 371775 CA1149118A (en) 1981-02-26 1981-02-26 Plastic injection molding machine

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CA 371775 CA1149118A (en) 1981-02-26 1981-02-26 Plastic injection molding machine
DE19813125431 DE3125431A1 (en) 1981-02-26 1981-06-27 Method and apparatus for injection molding of
GB8120015A GB2093757A (en) 1981-02-26 1981-06-29 Injection molding machine
JP10076781A JPS57144736A (en) 1981-02-26 1981-06-30 Method and device for injecting and molding plastic
FR8116319A FR2500362A1 (en) 1981-02-26 1981-08-26 by injection molding of an article into multiple parts and apparatus for implementation of METHOD

Publications (1)

Publication Number Publication Date
CA1149118A true CA1149118A (en) 1983-07-05

Family

ID=4119302

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 371775 Expired CA1149118A (en) 1981-02-26 1981-02-26 Plastic injection molding machine

Country Status (5)

Country Link
JP (1) JPS57144736A (en)
CA (1) CA1149118A (en)
DE (1) DE3125431A1 (en)
FR (1) FR2500362A1 (en)
GB (1) GB2093757A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0361571B2 (en) * 1982-08-31 1991-09-20 Aoki Shigeto
CA1256505A (en) * 1984-05-15 1989-06-27 James W. Crimmins Fm-am communications system with portable unit
DE3777785D1 (en) * 1986-12-26 1992-04-30 Idec Izumi Corp Traegerband for electronic components and manufacturing processes.
US5066446A (en) * 1989-11-13 1991-11-19 The B. F. Goodrich Company Method for making a blind fastener
US5207966A (en) * 1990-08-13 1993-05-04 The Hartwell Corporation Method for molding a strip of blind rivets
US5238377A (en) * 1990-08-13 1993-08-24 The Hartwell Corporation Apparatus for making blind rivets
DE19809723A1 (en) 1998-03-06 1999-09-09 Krauss Maffei Kunststofftech A device for picking up and transporting molded parts
US20040021253A1 (en) * 2002-08-02 2004-02-05 Davide Galletti Moulding method, carried out by a mould for a conventional injection press, suitable for cost-effectively realising a piece in one or more injectable materials, and relative mould for such a method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544140A (en) * 1947-12-09 1951-03-06 Floyd J Dofsen Process of forming an article from at least two plastics
US3302242A (en) * 1964-02-12 1967-02-07 Coats & Clark Die for intermolded number wheels
GB1111404A (en) * 1966-09-03 1968-04-24 Plasco Ltd Plastic blind rivet and method of producing the same

Also Published As

Publication number Publication date Type
GB2093757A (en) 1982-09-08 application
JPS57144736A (en) 1982-09-07 application
CA1149118A1 (en) grant
DE3125431A1 (en) 1982-09-09 application
FR2500362A1 (en) 1982-08-27 application

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Legal Events

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