GB2213186A - A method of manufacturing a seal-tight strip for motor vehicle bodywork - Google Patents

A method of manufacturing a seal-tight strip for motor vehicle bodywork Download PDF

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Publication number
GB2213186A
GB2213186A GB8828357A GB8828357A GB2213186A GB 2213186 A GB2213186 A GB 2213186A GB 8828357 A GB8828357 A GB 8828357A GB 8828357 A GB8828357 A GB 8828357A GB 2213186 A GB2213186 A GB 2213186A
Authority
GB
United Kingdom
Prior art keywords
strip
insert
tubular
sealing
region
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
GB8828357A
Other versions
GB8828357D0 (en
GB2213186B (en
Inventor
Francois Mesnel
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.)
Mesnel SA
Original Assignee
Mesnel SA
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 Mesnel SA filed Critical Mesnel SA
Publication of GB8828357D0 publication Critical patent/GB8828357D0/en
Publication of GB2213186A publication Critical patent/GB2213186A/en
Application granted granted Critical
Publication of GB2213186B publication Critical patent/GB2213186B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
    • B29C33/485—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling cores or mandrels
    • 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
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14409—Coating profiles or strips by injecting end or corner or intermediate parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J10/00—Sealing arrangements
    • B60J10/15—Sealing arrangements characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J10/00—Sealing arrangements
    • B60J10/20—Sealing arrangements characterised by the shape
    • B60J10/21—Sealing arrangements characterised by the shape having corner parts or bends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J10/00—Sealing arrangements
    • B60J10/80—Sealing arrangements specially adapted for opening panels, e.g. doors
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • 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
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Seal Device For Vehicle (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)

Description

r) -, 1 1 /- 2 1 i u, 01-.
A METHOD OF MANUFACTURING A SEAL-TIGHT STRIP FOR MOTOR VEHICLE BODYWORK The present invention relates to a novel method of manufacturing a seal'strip for motor vehicle bodywork, intended to be fitted around the door frames of said bodywork.
It is well known that such sealing strips normally comprise one part which forms a gripper which is intended to secure the seal on a projecting edge of the frame, and rigid with it a flexible sealing element of substan tially tubular and hollow form which is intended for insertion between the bodywork and the door, and comprises an outwardly facing sealing lip. The part which forms the gripper normally comprises a U-section metal rein forcement sheathed with a plastics material such as polyvinylchloride, while the sealing element is normally made from cellular elastomer.
Such a sealing strip and its method of manufacture are described in French Patent no. 2,247,341 in the name of the Applicants. In this prior art patent, the aim is to reinforce those parts of the seal which are intended to occupy a position in the corners of the door frames so as to improve both the sealing tightness and the mechanical strength of the seal, and this is achieved by over-moulding on the sealing lip a flared portion which consists of 5 compact elastomer.
It is the aim of the present invention to improve the mechanical strength and sealing-tightness of such seals in the areas at the corner of the door frames by reinforcing, at this location, not the sealing lip itself but the tubular element to which it is attached in order to flare it out to the shape of the frame.
In accordance with one aspect of the present invention, there is provided a flexible resilient sealing strip for motor vehicle doors, said strip comprising a U-shaped gripping portion enabling the strip to be fixed on a projecting part of the door, and a tubular sealing portion of a cellular elastomer, attached to the gripping portion and coextensive therewith along the length of the strip, the sealing portion in use being compressed between the doorframe and the door to provide a seal therebetween, the said strip in use extending around at least one corner of the door, wherein, in the region of the strip intended to extend around that corner, the outermost wall portion of the tubular sealing portion, remote from the gripping portion and directed towards the door frame is flared outwardly towards the door frame 2 by a moulded insert of compact elastomer inserted and moulded into a slit formed in said outermost wall portion directed in use toward said door frame, thereby locally increasing the cross-sectional area of the tubular sealing portion in that region, the outermost surface of the insert being substantially coplanar with the surface of the sealing strip.
In this type of seal, the compact elastomer preferably has a low Shore hardness close to that of the cellular elastomer which constitutes the tubular sealing portion.
In accordance with a second aspect of the present invention there is provided a method of manufacturing such a sealing strip, comprising the following sequence of phases:
(a) forming a cut in the outwardly directed wall portion of the tubular sealing portion of a preformed tubular sealing strip comprising said U-shaped gripping portion and said tubular sealing portion of cellular elastomer, said cut being formed in said strip in the region thereof which is intended to extend around the said corner of the door; (b) inserting into the tubular sealing portion of said strip in said corner region and through said cut an arcuate metallic core member confor ming generally to the shape of said corner and having 2 cross-sectional area that is greater than the cross-sectional area of the tubular portion of the sealing strip, thereby to enlarge the opening formed in said tubular portion by said cut; (c) placing that enlarged region of the strip, with the metallic core member in place, in an injection mould; (d) injection moulding into said enlarged opening said insert of compact elastomer; (e) removing the strip from the injection mould, and removing the metallic core member from inside the sealing portion of the strip leaving the moulded insert in place; and (f) resealing the edges of the slit around the moulded insert.
Preferably, at the place on the portion which corresponds to the connection of the compact injected elastomer and the cellular elastomer, the insert has an over-thickness which lends itself to slight compression of the cellular elastomer, avoiding the appearance of bosses or projections on the surface of the tubular element, by giving it one continuous and uniform surface.
In per se known manner, as disclosed by the aforesaid French Patent j 3 No. 2,247,341, the injection mould will preferably comprise, for receiving the gripper portion, a housing which is thermally insulated from the rest of the mould in order to protect the plastics material sheathing the reinforcement of the said gripper.
Resealing of this compact elastomer lip against the facing part of the tubular element may be carried out by using cold setting glue, for example using glue of the cyano-acrylate type, or by hot gluing, using vulcanisable glues.
An embodiment of the invention will be described hereinafter by way of the following non-limiting example reference being made to the appen ded diagrammatic drawings, in which:
Figure 1 is a cross-section through a conventional type of sealing strip prior to modification by the method according to the present invention.
Figure 2 is a perspective view of the insert which is intended to be introduced into the part of the tubular sealing portion corresponding to the corner portion of the frame after a suitable opening has been cut in this tubular sealing portion; Figure 3 is a cross-section through the mould illustr;5t!ng the over moulding onto the sealing portion of a lip which consists of flexible compact elastomer; Figure 4 illustrates withdrawal of the sealing strip from the injection mould, the tubular sealing portion still being in position on the insert; Figure 5 is a cross-section through the sealing strip obtained after the elastomer lip has been sealed against the part of the tubular sealing portion which is opposite it.
The sealing strip of a conventional type shown in Figure 1 comprises a gripper portion 1, intended to fit over a projecting edge of a door to a motor vehicle enabling the strip to be fixed on the door. This gripper 1 comprises a metal core 2 of U-shaped cross-section, sheated on the outside by a plastics material 3 such as plasticised polyvinylchloride. Coextensive with the gripper 1 is a tubular sealing portion 4 of a cellular elastomer, comprising a lip 5, the whole being intended to ensure a tight seal between the door of the motor vehicle and the bodywork.
In order to shape the tubular sealing portion to suit a corner part of the door frame without causing the appearance of creases on the surface of this tubular sealing portion, it is desirable to be able to replace a part of the section of the corresponding portion of the tubular element by an attached 4 element of compact elastomer.
To this end, according to the method of this invention, a cut is made in the outwardly directed wall portion of the tubular sealing portion 4 of the sealing strip, shown in Figure 1, said cut being formed in the region of the strip corresponding to a corner portion of the door. In this condition, the seal is generally rectilinear. The resultant aperture comprises, at the level of the gripper 1, a base 6, (Figure 3) opposite which there is a lip 7.
Into this aperture there is inserted the metallic core 8 shown in Figure 2, and which is intended to constitute the core of the injection mould in Figure 3.
This. insert, curved according to the fillet in the corner part of the frame, makes it possible to shape the sealing portion to the corner profile.
it conforms generally to the interior shape of the tubular sealing portion, having a cross-sectional area that is slightly greater than that of the tubular seaing portion, and it has on its surface, at the point of attachment of the injection moulded element on the lip 7, an over-thickness intended to avoid considerable compression of the cellular material and in order to ensure a continuity of perfectly smooth outer surface.
Thus prepared, the insert 8 is introduced into the injection mould in three parts 10, 11, 12, of per se known type and shown in Figure 3. In part 12, a housing 13, thermally insulated from the rest of the mould by a heat proof shield 14, receives the gripper 1 of the sealing strip and avoids the plastics material which it comprises suffering any of the thermal conditions involved in the injection moulding process.
Injection moulding of the compact elastomer is carried out by the nozzle 15 of the part 10 of the mould. This part 10 and the part 11 are so shaped as to permit moulding on the periphery of the insert 8 of a lip 16 which, without any discontinuity, connects to the lip 7 of the tubular sealing portion. The attachment line 17 which appears on Figurd 4, is only shown for the sake of clarity, being virtually indiscernible on the surface of the tubular sealing portion which emerges from the mould.
After withdrawal of the insert 8 from the tubular sealing portion, it is sufficient by gluing to join the lip 16 of compact elastomer to the base part 6 of the tubular sealing portion which is opposite it in order to reconstitute the said tubular sealing portion (see Figure 44) with a reinforced and flared part 16 in the outer portion of the corner of the frame.
As has been indicated hereinabove, the part 16 will be attached in 1 such a way that it does not come in contact with the door in the position of closure thereof, in order to avoid any excessive stress to this attached part.
The invention therefore provides a simple and easy means of imple mentation in order to produce sealing strips of improved quality for motor vehible bodywork.
6

Claims (11)

  1. A flexible, resilient sealing strip for motor vehicle doors, said strip comprising a U-shaped gripping portion enabling the strip to be fixed on a projecting part of the door, and a tubular sealing portion of a cellular elas tomer, attached to the gripping portion and co-extensive therewith along the length of the strip, the sealing portion in use being compressed between the door frame and the door to provide a seal therebetween, the said strip in use extending around at least one corner of the door, wherein, in the region of the strip intended to extend around that corner, the outermost wall portion of the tubular sealing portion, remote from the gripping portion and directed towards the door frame, is flared outwardly towards the door frame by a moulded insert of compact elastomer inserted and moulded into a slit formed in said outermost wall portion directed in use towards said door frame, thereby locally increasing the cross-sectional area of the tubular se2ling portion in that region, the outermost surface of the insert being substantially coplanar with the surface of the sealing strip.
  2. 2. A method of manufacturing a sealing strip according to claim 1, which comprises:
    (a) forming a cut in the outwardly directed wall portion of the tubular sealing portion of a preformed tubular sealing strip comprising said U-shaped gripping portion and said tubular sealing portion of cellular elastomer, said cut being formed in said strip in the region thereof which is intended to extend around the said corner of the door; (b) inserting into the tubular sealing portion of said strip in said corner region and through said cut an arcuate metallic core member confor ming generally to the shape of said corner and having a cross-sectional area that is greater than the cross-sectional area of the tubular portion of the sealing strip, thereby to enlarge the opening formed in said tubular portion by said cut; (c) placing that enlarged region of the strip, with the metallic core member in place, in an injection mould; (d) injection moulding into said enlarged opening said insert of compact elastomer; (e) removing the strip from the injection mould, and removing the metallic core member from inside the sealing portion of the strip leaving 7 the moulded insert in place; and (f) resealing the edges of the slit around the moulded insert.
  3. 3. A method according to claim 2, wherein in step (c) the dimensions of the core member and the mould cavity are such that in the region of the join between the cut edge of the tubular sealing portion of the strip and the insert, the cellular elastomeric material in the region of that cut edge is compressed.
  4. 4. A method according to claim 2 or 3, wherein in step (f) the edges of the slit around the insert are resealed by gluing.
  5. 5. A method according to claim 4, wherein the edges of the slit around the insert are resealed with a cold setting glue.
  6. 6. A method according to claim 5, wherein the cold setting glue is a cyanoacrylate.
  7. 7.' A method according to claim 4, wherein the edges of the slit around the insert are resealed with a vulcanised glue.
  8. 8. A method according to any one of claims 2 to 7, wherein in steps (c) and (d) the strip is inserted into an injection mould having an insulated housing which receives the gripping portion of the strip and protects the gripping portion from heat damage during the injection moulding of the compact elastomer insert.
  9. 9. A method according to claim 2, substantially as hereinbefore described with reference to the accompanying drawings.
  10. 10. A sealing strip according to claim 1, substantially as hereinbefore described with reference to Figure 5 of the accompanying drawings.
  11. 11. A sealing strip according to claim 1 when prepared by a method substantially as hereinbefore described with reference to the accompanying drawings.
    Published 1989 at The Patent Office, State House, 66'71 High Holborn, London WCIR 4TP Flirther copies maybe obtained from The Patent Office. Sales Branch, St Mary Cray, Orpington. Rent BR5 3P.D. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1/87
GB8828357A 1987-12-04 1988-12-05 A method of manufacturing a seal-tight strip for motor vehicle bodywork Expired - Fee Related GB2213186B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8716892A FR2624191B1 (en) 1987-12-04 1987-12-04

Publications (3)

Publication Number Publication Date
GB8828357D0 GB8828357D0 (en) 1989-01-05
GB2213186A true GB2213186A (en) 1989-08-09
GB2213186B GB2213186B (en) 1991-09-25

Family

ID=9357504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8828357A Expired - Fee Related GB2213186B (en) 1987-12-04 1988-12-05 A method of manufacturing a seal-tight strip for motor vehicle bodywork

Country Status (5)

Country Link
DE (1) DE3840738C2 (en)
ES (1) ES2013371A6 (en)
FR (1) FR2624191B1 (en)
GB (1) GB2213186B (en)
PT (1) PT89139B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237768A (en) * 1989-11-10 1991-05-15 Draftex Ind Ltd A method and apparatus for moulding a bend curvature into the tubular sealing part of a vehicle door seal
US5296067A (en) * 1990-11-20 1994-03-22 Etablissements Mesnel S.A. Process for production of a seal for the frame of an aperture of the body of an automobile

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688452B1 (en) * 1992-03-10 1995-08-11 Hutchinson SEALING DEVICE WITH TUBULAR PROFILE MEMBER, ESPECIALLY FOR A MOTOR VEHICLE.
DE9307620U1 (en) * 1993-05-19 1993-08-05 Meteor Gummiwerke K. H. Bädje GmbH & Co, 31167 Bockenem Automotive sealing
DE19537693C1 (en) * 1995-10-10 1996-10-02 Sekurit Saint Gobain Deutsch Glass panel mfr. for a thermoplastic elastomer profiled frame
DE102005001753A1 (en) * 2005-01-14 2006-08-24 Rehau Ag + Co Method and device for the production of plastic strips, injection molding tool of such a device as well as produced by such a method plastic strip
FR2898181B1 (en) * 2006-03-01 2008-04-18 Rehau Sa PROFILE EXTRUDE, ADHESIVE, HAVING AN ANGLE OVERMOLDING AND METHOD OF MAKING SUCH A PROFILE.
DE102007015464A1 (en) * 2007-03-30 2008-10-02 Metzeler Automotive Profile Systems Gmbh Method for producing a sealing arrangement, in particular for a motor vehicle, and such a sealing arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1488272A (en) * 1974-01-09 1977-10-12 Draftex Sealing strips for door openings and the like
GB1544420A (en) * 1975-11-21 1979-04-19 Draftex Dev Ag Channel-shaped sealing strips
GB2183707A (en) * 1985-12-10 1987-06-10 Draftex Ind Ltd Sealing strip

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2247341B1 (en) * 1973-10-12 1977-03-11 Mesnel Sa Ets
FR2332409A1 (en) * 1975-11-21 1977-06-17 Draftex Dev Ag Profiled strip for sealing door or window opening - with corner section applied by low-temp. pressing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1488272A (en) * 1974-01-09 1977-10-12 Draftex Sealing strips for door openings and the like
GB1544420A (en) * 1975-11-21 1979-04-19 Draftex Dev Ag Channel-shaped sealing strips
GB2183707A (en) * 1985-12-10 1987-06-10 Draftex Ind Ltd Sealing strip

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237768A (en) * 1989-11-10 1991-05-15 Draftex Ind Ltd A method and apparatus for moulding a bend curvature into the tubular sealing part of a vehicle door seal
GB2237768B (en) * 1989-11-10 1993-06-02 Draftex Ind Ltd Sealing strips and methods and apparatus for making them
US5296067A (en) * 1990-11-20 1994-03-22 Etablissements Mesnel S.A. Process for production of a seal for the frame of an aperture of the body of an automobile

Also Published As

Publication number Publication date
PT89139A (en) 1989-09-14
DE3840738C2 (en) 1997-02-13
GB8828357D0 (en) 1989-01-05
DE3840738A1 (en) 1989-06-15
FR2624191B1 (en) 1993-10-22
PT89139B (en) 1993-05-31
GB2213186B (en) 1991-09-25
FR2624191A1 (en) 1989-06-09
ES2013371A6 (en) 1990-05-01

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20041205