CA1298279C - Method of injection molding and plastic part formed thereby - Google Patents
Method of injection molding and plastic part formed therebyInfo
- Publication number
- CA1298279C CA1298279C CA000549881A CA549881A CA1298279C CA 1298279 C CA1298279 C CA 1298279C CA 000549881 A CA000549881 A CA 000549881A CA 549881 A CA549881 A CA 549881A CA 1298279 C CA1298279 C CA 1298279C
- Authority
- CA
- Canada
- Prior art keywords
- tubular
- lip
- cylindrical
- mold
- plastic material
- 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 - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0246—Arrangements for connecting header boxes with flow lines
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/261—Moulds having tubular mould cavities
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/067—Details
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/18—Heat-exchangers or parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F2255/14—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded
- F28F2255/143—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded injection molded
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/058—Undercut
Abstract
ABSTRACT OF THE DISCLOSURE
A process for forming a plastic part having a tubular portion that is continuous and without any flash/mismatch due to mold parting lines in which an injec-tion mold is provided having a cavity formed with a cylindri-cal surface portion and a core member removably inserted endwise into the cylindrical portion. A molten plastic material is injected into the cavity so that it extends into the cylindrical portion and around the core member. The core member is then withdrawn in an axial direction from the cylindrical portion after the plastic material therein has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface. Thereafter, the molded tubular shape and the cylindrical mold surface are moved relative to each other in an axial direction so that they are moved away from each other and the tubular portion is withdrawn from the mold, with the tubular portion yielding or flexing to whatever extent is necessary in order to clear the mold.
A process for forming a plastic part having a tubular portion that is continuous and without any flash/mismatch due to mold parting lines in which an injec-tion mold is provided having a cavity formed with a cylindri-cal surface portion and a core member removably inserted endwise into the cylindrical portion. A molten plastic material is injected into the cavity so that it extends into the cylindrical portion and around the core member. The core member is then withdrawn in an axial direction from the cylindrical portion after the plastic material therein has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface. Thereafter, the molded tubular shape and the cylindrical mold surface are moved relative to each other in an axial direction so that they are moved away from each other and the tubular portion is withdrawn from the mold, with the tubular portion yielding or flexing to whatever extent is necessary in order to clear the mold.
Description
1~9~279 Method Of Injection Molding And Plastic Part Formed Thereby BACKGROUN~ OF THE INVENTION
This invention relates generally to injection molded parts such as the inlet or outlet portion of an automobile radiator which includes one or more tubular portions on which the hoses for circulating water through the radiator are mounted. In the past, these parts have been molded utilizing mold sections that are moved toward and away from each other resulting in a parting line between the mold sections. The result is a formation of "flash/mismatch" on the tubular portions of the radiator part on which the hoses are mounted.
Flash results from the plastic being molded coming out between the parting lines of the mold, and mismatch is excess plastic on the molded part resulting from mold parts which are not in exact ali~nment. The result is undesirable and excess plastic on the molded part herein referred to as "flash/mismatch".
During use of the mold, the resulting becomes flash/mismatch increasingly significant and more and more ~0 prone to leaka~e when the hoses mounted thereon. The result is an unsatisfactory situation from the standpoint of keeping the hoses mounted on the radiator part without damage or leakage in this area.
It is an object of the present invention, therefore, to provide an improved method for forming parts of this type in which the parting lines on the tubular portions are avoided to thereby avoid the possibility of damage or leakage in this area.
SUMMARY OF THE TNVENTION
The method of this invention enables forming a ~L
1~9~Z~9 plastic part having a tubular portion with a radially enlarged lip at the terminal end thereof and without any flash/m1smatch on the tubular part due to mold p~rtln~ l$nes.
This 1B accomplished by providing ~n ln~ectlon mold h~ving a cavity formed with a cylindrical surface portion which terminates at the end of the groove located to form the lip and a core member removably inserted endwise in the cylindri-~al portion. This core contains a ~tep radially outward beginning at the tube end and continuing in an axial plane to a point aligning with the full radii of the enlarged lip on the outer tubular surface. A molten plastic material is injected into the cavity so that it extends into the cylin-drical portion and around the core member. The core member is then axially withdrawn from the cylindrical portion of the mold cavity after the plastic material in the cylindrical portion has solidified enough to retain its tubular shape, but before it has completely cooled, to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface during further cooling. Thereafter, the cylindrical surface portion of the injection mold is moved in an axial direction relative to the tubular shape plastic material to wit}ldraw the tubular shape from the cylindrical portion, with the tubular shape deflecting enough to have the mold clear the enlarged lip.
The result is a molded part that can be assembled with other more fragile parts, such as hoses without ris~ing damage to the hoses due to the sharp flash/mismatch on the molded part.
Further objects, features and advantages of the invention will become apparent from a consideration of the following description and the appended claims when taken in connection with the accompanying drawing in which:
Fig. 1 is a fragmentary ~ectional view of injection mold apparatus for forming the improved part of thi6 inven-tion;
Fig. 2 is a fragmentary detail view of a portion of the apparatus shown in Fig. 1 showing the injection molded part in a partially cooled condition ~nd with the core withdrawn from the tubular portion of the part;
Fig. 3 is a ~ectional view of the mold apparatus ~howing the molded part fully removed from the injecti~n mold; and Fig. 4 is a perspective view of the finished part.
The part formed according to the method of this invention, indicated generally at 10, is illustrated in Fig.
4 as a cover for a vehicle radiator consisting of an elongat-ed hollow body member 12 having a tubular portion or wall 14 at one end for attaching a hose (not shown) to the radiator cover'10.
The outlet 10 is formed in injection mold apparatus 16 illustrated ln Figs. l, 2 and 3. The apparatus 16 includes an injection passage 18 through which molten plastic is injected into the mold cavity 20. A core 22 extends into the cavity 20 so as to cooperate with the cylindrical surface 24 therein to form an annular passage 26 of a ~ize and shape to form the tubular portion 14.
As shown in Figs. 1 and 2, the axially outer end of the cylindrical surface 24 terminates in an annular groove 28 of a shape to form an annular hose retention lip 30 on the tubular portion 14. Two parts 31 and 32 of the mold appara--tus 16 are of a complementary shape to form the outlet body 12.
~Z98279 The core 22 has an enlarge step 33 located in radial alignment with the grooves 28 to cause a thinning of the wall which forms the lip 30, ~nd form an lnternal shoulder 35 in the tubular portion 14.
In the use of the mold apparatus, molten plastic 34 i8 injected into the mold cavity 20 through the inlet passage 18. Any suitable thermoplastic polymer can be used in the process of this invention to manufacture the part 10.
Examples of polymers that can be used in the process of this invention are high density polyethylene, high impact polystyrene, polypropylene, polycarbonate, nylon 66-33%
glass filled, and other thermoplastics which will retain their shape shortly after injection molding and which shrink when they cool. rrhe molten plastic is injected into the ca~ity 20 80 as to form the plastic tubular portion 14, as shown in Fig. 2.
Promptly after the cavity 26 has been filled with plastic, the core 22 is withdrawn in a direction along the axis 36 of the tubular portion 14 so that the core 22 is in a clearance relation with the tubular portion 14 as shown in Fig. 2.
As the tubular portion 14 continues to cool, it shrinks away from the cylindric~l surface 24, as illustrated in Fig. 2, so that it 18 ln a clearsnce relation with the surface 24. The portion 38 of the mold apparatus 16 that forms the surface 24, is then withdrawn along the same axis 36, as shown in Fig. 3, with the step 33 on the core 22, causing a thinning of the portion 37 of the tubular wall that terminates in the lip 30. The reduced thickness of the wall portion 37 enables the lip 30 to deflect inwardly enough to clear the surface 24 shown in Fig. 2.
1298~79 The mold parts 31 amd 32 are then separated ~Fig.
3~ and the part 10 i8 removed. The result ~8 ~ molded part 10 ln which the tubular portlon 14 has a continuous smooth cylindrical outer surface which $s without any flange projections or protrusions corresponding to the gaps between mating mold parts. The external surface 40 of the tubular portion 14 is uniformly smooth so that when a relatively fra~ile fluid carrying tube i8 telescoped over the tubular portion 40 and retained thereon by the lip 30, it will not be damaged over a prolonged service life.
A specific example of the process i6 as follows:
MATERIAL:
33~ glass filled type 66 Nylon Melting Point 250-265C
Glass Fiber Content 30.0-35.0%
Specific Gravity 1.38-1.42 Tensile Strength - PSI 25,000 Min.
Flexural Strength - PSI 1,100,000 Min.
PROCESS PARAMETERS:
Press Size 450 Ton Barrell Temp. Rear 55~ F
Barrell Temp. Center 563F
Barrell Temp. Front 570F
Barrell Temp. Nozzle 544F
Injection Pressure 1st 1000 Injection Pressure 2nd 600#
Back Pressure 50#
Screw Speed Medium Range Mold Cooling:
Front Cavity 120F
Slides 120F
~Z98279 Seamless Core 90F
Cycle Times:
Ram Time 12 sec.
Bosster Time4 sec.
Mold Close Time 24 ~ec.
Screw Pull ~ack 0.42 6ec.
Injection Fill Time 5.5 sec.
Core 22 is withdrawn 15 seconds before molds open.
From the above description, it is seen that this invention provides an improved radiator outlet 10, or other suitable part, having the tubular portion 14 which has a smooth continuous outer surface 40 and includes the lip 34 retaining a hose thereon. Such a part has obvious advantages over similar parts that are burdened with the usual projec-tions corresponding to the spaces between mating mold parts.
,
This invention relates generally to injection molded parts such as the inlet or outlet portion of an automobile radiator which includes one or more tubular portions on which the hoses for circulating water through the radiator are mounted. In the past, these parts have been molded utilizing mold sections that are moved toward and away from each other resulting in a parting line between the mold sections. The result is a formation of "flash/mismatch" on the tubular portions of the radiator part on which the hoses are mounted.
Flash results from the plastic being molded coming out between the parting lines of the mold, and mismatch is excess plastic on the molded part resulting from mold parts which are not in exact ali~nment. The result is undesirable and excess plastic on the molded part herein referred to as "flash/mismatch".
During use of the mold, the resulting becomes flash/mismatch increasingly significant and more and more ~0 prone to leaka~e when the hoses mounted thereon. The result is an unsatisfactory situation from the standpoint of keeping the hoses mounted on the radiator part without damage or leakage in this area.
It is an object of the present invention, therefore, to provide an improved method for forming parts of this type in which the parting lines on the tubular portions are avoided to thereby avoid the possibility of damage or leakage in this area.
SUMMARY OF THE TNVENTION
The method of this invention enables forming a ~L
1~9~Z~9 plastic part having a tubular portion with a radially enlarged lip at the terminal end thereof and without any flash/m1smatch on the tubular part due to mold p~rtln~ l$nes.
This 1B accomplished by providing ~n ln~ectlon mold h~ving a cavity formed with a cylindrical surface portion which terminates at the end of the groove located to form the lip and a core member removably inserted endwise in the cylindri-~al portion. This core contains a ~tep radially outward beginning at the tube end and continuing in an axial plane to a point aligning with the full radii of the enlarged lip on the outer tubular surface. A molten plastic material is injected into the cavity so that it extends into the cylin-drical portion and around the core member. The core member is then axially withdrawn from the cylindrical portion of the mold cavity after the plastic material in the cylindrical portion has solidified enough to retain its tubular shape, but before it has completely cooled, to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface during further cooling. Thereafter, the cylindrical surface portion of the injection mold is moved in an axial direction relative to the tubular shape plastic material to wit}ldraw the tubular shape from the cylindrical portion, with the tubular shape deflecting enough to have the mold clear the enlarged lip.
The result is a molded part that can be assembled with other more fragile parts, such as hoses without ris~ing damage to the hoses due to the sharp flash/mismatch on the molded part.
Further objects, features and advantages of the invention will become apparent from a consideration of the following description and the appended claims when taken in connection with the accompanying drawing in which:
Fig. 1 is a fragmentary ~ectional view of injection mold apparatus for forming the improved part of thi6 inven-tion;
Fig. 2 is a fragmentary detail view of a portion of the apparatus shown in Fig. 1 showing the injection molded part in a partially cooled condition ~nd with the core withdrawn from the tubular portion of the part;
Fig. 3 is a ~ectional view of the mold apparatus ~howing the molded part fully removed from the injecti~n mold; and Fig. 4 is a perspective view of the finished part.
The part formed according to the method of this invention, indicated generally at 10, is illustrated in Fig.
4 as a cover for a vehicle radiator consisting of an elongat-ed hollow body member 12 having a tubular portion or wall 14 at one end for attaching a hose (not shown) to the radiator cover'10.
The outlet 10 is formed in injection mold apparatus 16 illustrated ln Figs. l, 2 and 3. The apparatus 16 includes an injection passage 18 through which molten plastic is injected into the mold cavity 20. A core 22 extends into the cavity 20 so as to cooperate with the cylindrical surface 24 therein to form an annular passage 26 of a ~ize and shape to form the tubular portion 14.
As shown in Figs. 1 and 2, the axially outer end of the cylindrical surface 24 terminates in an annular groove 28 of a shape to form an annular hose retention lip 30 on the tubular portion 14. Two parts 31 and 32 of the mold appara--tus 16 are of a complementary shape to form the outlet body 12.
~Z98279 The core 22 has an enlarge step 33 located in radial alignment with the grooves 28 to cause a thinning of the wall which forms the lip 30, ~nd form an lnternal shoulder 35 in the tubular portion 14.
In the use of the mold apparatus, molten plastic 34 i8 injected into the mold cavity 20 through the inlet passage 18. Any suitable thermoplastic polymer can be used in the process of this invention to manufacture the part 10.
Examples of polymers that can be used in the process of this invention are high density polyethylene, high impact polystyrene, polypropylene, polycarbonate, nylon 66-33%
glass filled, and other thermoplastics which will retain their shape shortly after injection molding and which shrink when they cool. rrhe molten plastic is injected into the ca~ity 20 80 as to form the plastic tubular portion 14, as shown in Fig. 2.
Promptly after the cavity 26 has been filled with plastic, the core 22 is withdrawn in a direction along the axis 36 of the tubular portion 14 so that the core 22 is in a clearance relation with the tubular portion 14 as shown in Fig. 2.
As the tubular portion 14 continues to cool, it shrinks away from the cylindric~l surface 24, as illustrated in Fig. 2, so that it 18 ln a clearsnce relation with the surface 24. The portion 38 of the mold apparatus 16 that forms the surface 24, is then withdrawn along the same axis 36, as shown in Fig. 3, with the step 33 on the core 22, causing a thinning of the portion 37 of the tubular wall that terminates in the lip 30. The reduced thickness of the wall portion 37 enables the lip 30 to deflect inwardly enough to clear the surface 24 shown in Fig. 2.
1298~79 The mold parts 31 amd 32 are then separated ~Fig.
3~ and the part 10 i8 removed. The result ~8 ~ molded part 10 ln which the tubular portlon 14 has a continuous smooth cylindrical outer surface which $s without any flange projections or protrusions corresponding to the gaps between mating mold parts. The external surface 40 of the tubular portion 14 is uniformly smooth so that when a relatively fra~ile fluid carrying tube i8 telescoped over the tubular portion 40 and retained thereon by the lip 30, it will not be damaged over a prolonged service life.
A specific example of the process i6 as follows:
MATERIAL:
33~ glass filled type 66 Nylon Melting Point 250-265C
Glass Fiber Content 30.0-35.0%
Specific Gravity 1.38-1.42 Tensile Strength - PSI 25,000 Min.
Flexural Strength - PSI 1,100,000 Min.
PROCESS PARAMETERS:
Press Size 450 Ton Barrell Temp. Rear 55~ F
Barrell Temp. Center 563F
Barrell Temp. Front 570F
Barrell Temp. Nozzle 544F
Injection Pressure 1st 1000 Injection Pressure 2nd 600#
Back Pressure 50#
Screw Speed Medium Range Mold Cooling:
Front Cavity 120F
Slides 120F
~Z98279 Seamless Core 90F
Cycle Times:
Ram Time 12 sec.
Bosster Time4 sec.
Mold Close Time 24 ~ec.
Screw Pull ~ack 0.42 6ec.
Injection Fill Time 5.5 sec.
Core 22 is withdrawn 15 seconds before molds open.
From the above description, it is seen that this invention provides an improved radiator outlet 10, or other suitable part, having the tubular portion 14 which has a smooth continuous outer surface 40 and includes the lip 34 retaining a hose thereon. Such a part has obvious advantages over similar parts that are burdened with the usual projec-tions corresponding to the spaces between mating mold parts.
,
Claims (4)
1. The method of forming a plastic part having a tubular portion with a radially enlarged lip at the terminal end thereof comprising:
a) providing an injection mold having a cavity formed with a cylindrical surface portion terminating in a groove located to form said lip, and a core member removably inserted in said cylindrical portion and configured to be in close proximity to said cylindrical surface adjacent said lip;
b) injecting a molten plastic material into said cavity so that it extends into said cylindrical portion and around said core member, c) withdrawing said core member from said cylin-drical portion along a line extending axially of said cylindrical portion after the plastic material in said cylindrical portion has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable said plastic material to shrink radially inwardly away from said cylindrical surface; and d) thereafter providing for relative movement of said cylindrical surface portion and said tubular shape plastic material in a direction axially of said tubular shape to withdraw said tubular shape from said cylindrical portion, the close proximity of said core to said cylindrical surface adjacent said lip providing for a reduced wall thickness in said tubular shape adjacent said lip to enable deflection of said lip inwardly during said withdrawal.
a) providing an injection mold having a cavity formed with a cylindrical surface portion terminating in a groove located to form said lip, and a core member removably inserted in said cylindrical portion and configured to be in close proximity to said cylindrical surface adjacent said lip;
b) injecting a molten plastic material into said cavity so that it extends into said cylindrical portion and around said core member, c) withdrawing said core member from said cylin-drical portion along a line extending axially of said cylindrical portion after the plastic material in said cylindrical portion has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable said plastic material to shrink radially inwardly away from said cylindrical surface; and d) thereafter providing for relative movement of said cylindrical surface portion and said tubular shape plastic material in a direction axially of said tubular shape to withdraw said tubular shape from said cylindrical portion, the close proximity of said core to said cylindrical surface adjacent said lip providing for a reduced wall thickness in said tubular shape adjacent said lip to enable deflection of said lip inwardly during said withdrawal.
2. A plastic part formed according to the process set forth in claim 1.
3. A plastic molded radiator part having a tubular portion for supporting a hose, said tubular portion being provided with a smooth external surface uninterrupted with any sharp protrusions that could extend into a hose on said tubular portion and having a radially enlarged external surface lip at the terminal end tehreof and a reduced thickness wall portion at the terminal end.
4. A plastic molded radiator part according to claim 3 wherein said reduced thickness wall portion termin-ates on the inner surface of said tubular portion in a radially extending shoulder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US934,437 | 1986-11-24 | ||
| US06/934,437 US4709757A (en) | 1986-11-24 | 1986-11-24 | Method of injection molding and plastic part formed thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1298279C true CA1298279C (en) | 1992-03-31 |
Family
ID=25465577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000549881A Expired - Fee Related CA1298279C (en) | 1986-11-24 | 1987-10-21 | Method of injection molding and plastic part formed thereby |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4709757A (en) |
| EP (1) | EP0269217B1 (en) |
| JP (1) | JPS63154314A (en) |
| AU (1) | AU589880B2 (en) |
| CA (1) | CA1298279C (en) |
| DE (1) | DE3782316T2 (en) |
| MX (1) | MX165825B (en) |
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| CA1322284C (en) * | 1988-03-14 | 1993-09-21 | Robert K. Mitchell | Molded camshaft assembly |
| US4873043A (en) * | 1988-03-25 | 1989-10-10 | Hoover Universal, Inc. | Method injection molded a plastic part with a round tubular portion |
| US4903760A (en) * | 1989-05-24 | 1990-02-27 | General Motors Corporation | Integral oil cooler and radiator tank |
| DE9002438U1 (en) * | 1990-03-02 | 1990-04-12 | Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart, De | |
| US5178303A (en) * | 1991-05-17 | 1993-01-12 | Colder Products Company, Inc. | Dispensing valve apparatus |
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| DE102008060842A1 (en) * | 2008-12-05 | 2010-06-10 | Robert Bosch Gmbh | Plastic housing production device for pneumatic slide valve, has tool core provided with elastic region, so that tool core is reversibly bringable from basic form into working form comprising undercut for formation of gradated boring |
| US9494245B1 (en) * | 2013-03-15 | 2016-11-15 | Humphrey Products Company | Over-molded valve stem and method of making a valve stem for a valve assembly |
| US9855675B1 (en) * | 2016-09-20 | 2018-01-02 | RELIGN Corporation | Arthroscopic devices and methods |
| JP6892090B2 (en) * | 2018-07-25 | 2021-06-18 | 株式会社テクノクラーツ | Undercut processing mechanism and molding mold |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1130153B (en) * | 1955-11-18 | 1962-05-24 | Neosid Pemetzrieder G M B H | Process for the production of injection molded parts from thermoplastic material |
| US3049758A (en) * | 1958-01-29 | 1962-08-21 | Western Electric Co | Molding machine |
| US3402713A (en) * | 1965-05-13 | 1968-09-24 | Becton Dickinson Co | Hypodermic syringe with improved retaining means |
| US3424831A (en) * | 1966-07-11 | 1969-01-28 | Spatz Lab | Methods for injection molding |
| DE2336789C3 (en) * | 1973-07-19 | 1979-02-08 | Stapla Hans-Dieter Golde Gmbh & Co Kg, 6365 Rosbach | Method and tool for demolding a core from an undercut plastic channel profile |
| US4155698A (en) * | 1975-04-08 | 1979-05-22 | Albert Obrist Ag | Method and apparatus for injection molding of plastic closures |
| FR2552537B1 (en) * | 1983-09-27 | 1985-11-22 | Valeo | HOUSING PROVIDED WITH A TUBING, IN PARTICULAR A HEAT EXCHANGER WATER BOX FOR A MOTOR VEHICLE, AND ITS MANUFACTURING METHOD |
| DE3443723A1 (en) * | 1984-11-30 | 1986-06-05 | Schultheis, Peter A., 3590 Bad Wildungen | PLASTIC TUBE AND METHOD AND INJECTION MOLDING MACHINE FOR ITS PRODUCTION |
-
1986
- 1986-11-24 US US06/934,437 patent/US4709757A/en not_active Expired - Lifetime
-
1987
- 1987-09-23 EP EP87308429A patent/EP0269217B1/en not_active Revoked
- 1987-09-23 DE DE8787308429T patent/DE3782316T2/en not_active Revoked
- 1987-10-21 CA CA000549881A patent/CA1298279C/en not_active Expired - Fee Related
- 1987-11-19 JP JP62293040A patent/JPS63154314A/en active Pending
- 1987-11-19 MX MX009429A patent/MX165825B/en unknown
- 1987-11-20 AU AU81441/87A patent/AU589880B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE3782316T2 (en) | 1993-03-25 |
| DE3782316D1 (en) | 1992-11-26 |
| US4709757A (en) | 1987-12-01 |
| EP0269217A2 (en) | 1988-06-01 |
| MX165825B (en) | 1992-12-07 |
| JPS63154314A (en) | 1988-06-27 |
| EP0269217A3 (en) | 1989-11-29 |
| AU8144187A (en) | 1988-05-26 |
| AU589880B2 (en) | 1989-10-19 |
| EP0269217B1 (en) | 1992-10-21 |
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