US2854373A - Postforming process - Google Patents

Postforming process Download PDF

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US2854373A
US2854373A US300320A US30032052A US2854373A US 2854373 A US2854373 A US 2854373A US 300320 A US300320 A US 300320A US 30032052 A US30032052 A US 30032052A US 2854373 A US2854373 A US 2854373A
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Prior art keywords
sheet
edges
adjacent
backing member
members
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US300320A
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William I Beach
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North American Aviation Corp
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North American Aviation Corp
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    • 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
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • B29C53/063—Forming folding lines by pressing or scoring combined with folding
    • B29C53/066—Forming folding lines by pressing or scoring combined with folding and joining the sides of the folding line, e.g. "Abkantschweissen"
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B13/00—Details of tables or desks
    • A47B13/08—Table tops; Rims therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0039—Producing countertops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/04—Non-loosenable joints for non-metal furniture parts, e.g. glued
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/20—Furniture panels or like furniture elements
    • A47B96/202—Furniture panels or like furniture elements with a continuous layer allowing folding
    • A47B2096/203—Profiled sections
    • A47B2096/204—Profiled sections using an insert
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/20—Furniture panels or like furniture elements
    • A47B96/202—Furniture panels or like furniture elements with a continuous layer allowing folding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • 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
    • B29L2031/44—Furniture or parts thereof
    • B29L2031/441—Countertops
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1043—Subsequent to assembly
    • Y10T156/1044—Subsequent to assembly of parallel stacked sheets only
    • Y10T156/1046—Bending of one lamina only
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/1092—All laminae planar and face to face

Definitions

  • This invention pertains to method and apparatus for utilizing the invention disclosed and claimed in Patent Number 2,433,643. That patent covers the postforming of certain materials by the application of heat Within certain limitations of time and temperature, forming the material while so heated, and allowing it to cool in its new form.
  • the material so postformed normally has suflicient flexural rigidity characteristics to enable it to be attached structurally in operative position for the intended purpose of the end products resulting therefrom.
  • protuberances such as screw heads, moldings, fastenings, and the like, are undesirable.
  • the decorative plastic surface is composed of a base of a relatively thick sheet of several layers of paper or fabric material, or the like, impregnated with a suitable heat-hardening resin such as phenol formaldehyde.
  • a suitable heat-hardening resin such as phenol formaldehyde.
  • a decorative layer of paper with a preselected design and color imprinted thereon, over which is applied a coat or layer of transparent resin of the type such as melamine, urea, or phenolic.
  • Materials such as these are presently being postformed by the use of the process described in Patent No. 2,433,643.
  • difficulty has been experienced in attaching the postformed product such as decorative plastic to a preformed backing structure to produce a pleasing contour Without introducing surface defects attributable to normal fabricating methods.
  • FIG. 1 is a perspective view of an arrangement of the invention
  • FIG. 2 illustrates forming of the material illustrated in Fig 1;
  • Fig. 3 illustrates a finished product made in accordance with the teachings of Figs. 1 and 2;
  • Fig. 4 is a view of an arrangement for forming an outside cove
  • Fig. 5 illustrates the finished product of Fig. 4.
  • Fig. 6 illustrates a means for heating the material for forming
  • Fig.7 is a novel arrangement of a corner
  • Fig. 8 is an inside perspective view of a product formed from the layout in Fig. 7;
  • Fig. 9 is an outside perspective view of a product formed from the layout in Fig. 7;
  • Fig. 10 is a perspective view of the arrangement for a corner prior to forming.
  • plastic material 1 which is postformable in accordance with Patent No. 2,433,643, is suitably attached to backup or structural supporting strips 2 and 3.
  • Material 1 may comprise a layer 14 of a transparent coated decorative material which may have a design in color or figure print, and forms a part of the postformable sheet stock 1.
  • sheet 1 is bonded, glued or otherwise suitably attached to sheets or strips 2 and 3.
  • sheets or strips 2 and 3 may be plywood, Masonite, or other inexpensive material having required strength characteristics.
  • the members 2 and 3 are spaced at 5 a sufiicient distance apart to enable postformingin accordance with Patent No. 2,433,643the sheet stock 1 with the members 2 and 3 attached thereto.
  • This spacing between members 2 and 3 is dependent, of course, upon the angle to which sheet 1 is to be bent and upon the thickness of the material of sheet 1. Where the material is to be bent to an angle of it is preferred to leave a space of approximately three times the radius of bend although other spacings are possible.
  • a forming die 6 is used for obtaining the cove at 7 While a reinforcing strip 8 may be added to stiffen the finished product. It has been discovered that when reinforcing members 2 and 3 are attached sheet material 1 may be successfully postformed by simply bending it around a single die 6 to the desired angle as illustrated in Fig. 2. This will provide a uniform, accurate bend without the necessity of employing both a male and female die.
  • sheet material 1 is applied to reinforcing strips 2 and 3 in a manner similar to the arrangement in Fig. 1.
  • a die 9 having the desired radius of curvature corresponding to the finished product. This die may form a part of the finished product and serve also as a reinforcement for the outside cove thus formed.
  • a reinforcing strip 10 is 3 provided, if desired, for strengthening the finished structure.
  • any of the methods of heating disclosed in that patent may be successfully used.
  • the entire area of sheet 1 as well as strips 2 and 3 may be heated, but for convenience and simplicity it is normally preferred to heat only the portions of the sheet where the bend is to be made.
  • the heating may be accomplished by means of an oven, a liquid bath, by conduction from heated plates, by subjecting the material to a high frequency alternating electric field, by radiant heating, or by any other suitable means.
  • a radiant heating arrangement such as shown in Fig. 6 has been found to be particularly satisfactory.
  • radiant heating element 15 is disposed on one side of sheet 1 and provided with a suitable reflector 16 to direct the heat towards sheet 1.
  • Heating element 15 may be disposed on either side of sheet 1, but is normally preferable to locate the heater on the side away from the bend which is to be made. If that is done it will be unnecessary to move the heater out of the way when the material is formed. If heating element 15 is disposed on the same side as the backup strips 2 and 3 it should, of course, be disposed near space as illustrated so that there will be no danger of the backup strips shading sheet 1 at the location of the bend and thereby preventing proper heating.
  • Strips 3 and 4 are spaced apart a suitable distance 5 to enable postforming, which may in the preferred embodiment equal approximately three times the radius of bend of the postformed part 1.
  • Strips 3 and 4 are provided with beveled or feathered ends at 11 and 12 to facilitate forming a finished corner when the ends are brought together as illustrated in Figs. 8 and 9.
  • Ends 11 and 12 may be beveled or feathered before or after attachment of the supporting strips to sheet 1. For convenience this is usually done before the attachment.
  • strips 3 and 4 form the support or backing for the edge portions of the article
  • sheet 2 forms the support or backing for the side or principal surface thereof.
  • a cutout portion 17 in sheet material 1 in space 5 at the corner as clearly shown in Fig. 7.
  • the fiat sheet of material 1 by overlying supporting sheet 2 and supporting strips 3 and 4, while having cutout portion 17 between the beveled ends of strips 3 and 4, as shown in Fig. 7, thereby defines corner forming portions. This will enable formation of the corner without difiiculty from excess material that might tend to shear or crumble, and it will permit feathered ends 11 and 12 to be neatly brought together.
  • the exact contour of the cutout portion will depend upon the radius to which sheet material 1 is to be formed.
  • the present invention readily adapts itself to factory production in the following manner:
  • the sheet material is attached to a correspondingly sized sheet of backup material, then portions of the backup material are routed out to the desired width at the areas to be postformed.
  • Such routing can be accomplishedby the use of a rabbeting tool, saw, chisel, or otherwise, to thereby remove any desired portion or shape from the backup material.
  • the hereindescribed invention has many applications for instance, in connection with coved type sink tops; cabinets, where structural elements or attaching means are desired; table tops having outside coves; molding for interior decorative purposes, and many others.
  • the invention is particularly applicable to form sink and drainboard surfaces having coved back splashes and rolled down edges. Utilization of the present invention avoids previous difficulties resulting from built-up tolerances between the overlay plastic sheet and the backing material. Further, there is avoided the laborious and costly technique previously used which comprised postforming the plastic sheet separately, fabricating the backing material, and then bonding the two materials together.
  • the invention disclosed herein is applicable for custom jobs and is particularly adaptable to factory production because of the ease of handling the fiat sheets with the backing material attached thereto.

Description

158 w. l. BEACH 2,854,373
I POSTFORMING RROCESS Filed July 22, 1952 2 Sheets-Sheet 1 fiiiiiilllliii) FIG.2'
FIG.3
INVENTOR.
WILLIAM I. BEACH I ATTORN EY Sept. 30, 1958 w. l. BEACH POSTFORMING PROCESS 2 SheetS-Sheet 2 Filed July 22, 1952 FIG. 6
INVENTOR.
WILLIAM n. BEACH FIG.
MAM/51K ATTORNEY Patented Sept. '30, 1958 POSTFORMING PROCESS William I. Beach, Los Angeles, Calif., assignor to North American Aviation, Inc.
Application July 22, 1952, Serial No. 300,320
2 Claims. (Cl. 154-110) This application is a continuation in part of my copending application for Postforming Process and Article, Serial No. 62,074, filed November 26, 1948, in the name of William 1. Beach, now abandoned.
This invention pertains to method and apparatus for utilizing the invention disclosed and claimed in Patent Number 2,433,643. That patent covers the postforming of certain materials by the application of heat Within certain limitations of time and temperature, forming the material while so heated, and allowing it to cool in its new form. The material so postformed normally has suflicient flexural rigidity characteristics to enable it to be attached structurally in operative position for the intended purpose of the end products resulting therefrom. However, in certain fields of operation, such as for decorative purposes wherein exposed surfaces reflect artistic configurations and warm and pleasing colors, protuberances such as screw heads, moldings, fastenings, and the like, are undesirable. Further, it is customary practice to support such decorative surfaces by attaching thereto, on the undersides thereof, materials having bulk characteristics for purposes of reinforcement and to prevent lateral deflection resulting from their normal use in applications such as table tops, sink tops, cabinets, or the like. The angularly arranged portions of the aforementioned items complicate fabricating techniques when it is desired to obtain a one-piece coved article.
In this connection, the decorative plastic surface is composed of a base of a relatively thick sheet of several layers of paper or fabric material, or the like, impregnated with a suitable heat-hardening resin such as phenol formaldehyde. To this base is applied a decorative layer of paper, with a preselected design and color imprinted thereon, over which is applied a coat or layer of transparent resin of the type such as melamine, urea, or phenolic. Materials such as these are presently being postformed by the use of the process described in Patent No. 2,433,643. However, when coved panels are desired, difficulty has been experienced in attaching the postformed product such as decorative plastic to a preformed backing structure to produce a pleasing contour Without introducing surface defects attributable to normal fabricating methods. This difficulty has been overcome, according to the present invention, by attaching the structural supporting elements or the backup members to the sheet of decorative material prior to postforming. In the past it has been necessary to individually and separately preform the plastic sheet material and structural supporting members into coved shapes, and then join or assemble them by conventional fastening or gluing methods. This has been unsatisfactory because of difficulty in obtaining the uniform connection between the decorative sheet and backing members throughout the horizontal and vertical surfaces. This is particularly so when members are arranged angularly with respect to each other since fabricating tolerances seldom permit these parts to match perfectly. The preforming and assembly method is further objectionable because of ex- United States Patent fiice pensive equipment necessary to apply gluing pressures to contoured surfaces. Obviously, this increases the pro duction cost.
Accordingly, it is an object of this invention to facilitate the production of postformed items having attached supporting structures.
It is a further object of this invention to attach supporting or backup structures to material prior to postforming the same.
It is yet another object of this invention to provide an arrangement for economically producing fiat sheets of postforming material having attached thereto supporting or backup structural shapes.
Further objects of the invention will become apparent from the following description taken in connection with the accompanying drawings, in which Fig. 1 is a perspective view of an arrangement of the invention;
' Fig. 2 illustrates forming of the material illustrated in Fig 1;
Fig. 3 illustrates a finished product made in accordance with the teachings of Figs. 1 and 2;
Fig. 4 is a view of an arrangement for forming an outside cove;
Fig. 5 illustrates the finished product of Fig. 4;
Fig. 6 illustrates a means for heating the material for forming;
Fig.7 is a novel arrangement of a corner;
Fig. 8 is an inside perspective view of a product formed from the layout in Fig. 7;
Fig. 9 is an outside perspective view of a product formed from the layout in Fig. 7; and
Fig. 10 is a perspective view of the arrangement for a corner prior to forming.
According to the invention plastic material 1, which is postformable in accordance with Patent No. 2,433,643, is suitably attached to backup or structural supporting strips 2 and 3. Material 1 may comprise a layer 14 of a transparent coated decorative material which may have a design in color or figure print, and forms a part of the postformable sheet stock 1.
In the preferred embodiment of the invention, sheet 1 is bonded, glued or otherwise suitably attached to sheets or strips 2 and 3. These may be plywood, Masonite, or other inexpensive material having required strength characteristics. The members 2 and 3 are spaced at 5 a sufiicient distance apart to enable postformingin accordance with Patent No. 2,433,643the sheet stock 1 with the members 2 and 3 attached thereto. This spacing between members 2 and 3 is dependent, of course, upon the angle to which sheet 1 is to be bent and upon the thickness of the material of sheet 1. Where the material is to be bent to an angle of it is preferred to leave a space of approximately three times the radius of bend although other spacings are possible. A forming die 6 is used for obtaining the cove at 7 While a reinforcing strip 8 may be added to stiffen the finished product. It has been discovered that when reinforcing members 2 and 3 are attached sheet material 1 may be successfully postformed by simply bending it around a single die 6 to the desired angle as illustrated in Fig. 2. This will provide a uniform, accurate bend without the necessity of employing both a male and female die.
In the application of the invention illustrated in Fig. 4, sheet material 1 is applied to reinforcing strips 2 and 3 in a manner similar to the arrangement in Fig. 1. However, there is provided in the space 5 a die 9 having the desired radius of curvature corresponding to the finished product. This die may form a part of the finished product and serve also as a reinforcement for the outside cove thus formed. A reinforcing strip 10 is 3 provided, if desired, for strengthening the finished structure.
In postforming sheet 1 in accordance with the teachings of Patent No. 2,433,643, any of the methods of heating disclosed in that patent may be successfully used. The entire area of sheet 1 as well as strips 2 and 3 may be heated, but for convenience and simplicity it is normally preferred to heat only the portions of the sheet where the bend is to be made. The heating may be accomplished by means of an oven, a liquid bath, by conduction from heated plates, by subjecting the material to a high frequency alternating electric field, by radiant heating, or by any other suitable means. A radiant heating arrangement such as shown in Fig. 6 has been found to be particularly satisfactory. As illustrated, radiant heating element 15 is disposed on one side of sheet 1 and provided with a suitable reflector 16 to direct the heat towards sheet 1. Heating element 15 may be disposed on either side of sheet 1, but is normally preferable to locate the heater on the side away from the bend which is to be made. If that is done it will be unnecessary to move the heater out of the way when the material is formed. If heating element 15 is disposed on the same side as the backup strips 2 and 3 it should, of course, be disposed near space as illustrated so that there will be no danger of the backup strips shading sheet 1 at the location of the bend and thereby preventing proper heating.
Referring now to the arrangement in Fig. 7, there is shown a sheet of material to the underside of which is glued, or otherwise fastened, supporting sheet 2 and strips 3 and 4 for forming an article having a corner. Strips 3 and 4 are spaced apart a suitable distance 5 to enable postforming, which may in the preferred embodiment equal approximately three times the radius of bend of the postformed part 1. Strips 3 and 4 are provided with beveled or feathered ends at 11 and 12 to facilitate forming a finished corner when the ends are brought together as illustrated in Figs. 8 and 9. Ends 11 and 12 may be beveled or feathered before or after attachment of the supporting strips to sheet 1. For convenience this is usually done before the attachment. Thus, as illustrated, strips 3 and 4 form the support or backing for the edge portions of the article, and sheet 2 forms the support or backing for the side or principal surface thereof. In providing such a corner it will be normally necessary to provide a cutout portion 17 in sheet material 1 in space 5 at the corner as clearly shown in Fig. 7. Thus the fiat sheet of material 1 by overlying supporting sheet 2 and supporting strips 3 and 4, while having cutout portion 17 between the beveled ends of strips 3 and 4, as shown in Fig. 7, thereby defines corner forming portions. This will enable formation of the corner without difiiculty from excess material that might tend to shear or crumble, and it will permit feathered ends 11 and 12 to be neatly brought together. The exact contour of the cutout portion will depend upon the radius to which sheet material 1 is to be formed.
The present invention readily adapts itself to factory production in the following manner: The sheet material is attached to a correspondingly sized sheet of backup material, then portions of the backup material are routed out to the desired width at the areas to be postformed. Such routing can be accomplishedby the use of a rabbeting tool, saw, chisel, or otherwise, to thereby remove any desired portion or shape from the backup material.
The hereindescribed invention has many applications for instance, in connection with coved type sink tops; cabinets, where structural elements or attaching means are desired; table tops having outside coves; molding for interior decorative purposes, and many others. The invention is particularly applicable to form sink and drainboard surfaces having coved back splashes and rolled down edges. Utilization of the present invention avoids previous difficulties resulting from built-up tolerances between the overlay plastic sheet and the backing material. Further, there is avoided the laborious and costly technique previously used which comprised postforming the plastic sheet separately, fabricating the backing material, and then bonding the two materials together. The invention disclosed herein is applicable for custom jobs and is particularly adaptable to factory production because of the ease of handling the fiat sheets with the backing material attached thereto.
Although the invention has been described and illustrated in detail, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of this invention being limited only by the terms of the appended claims.
I claim:
1. The process of forming from C-stage thermosetting resin-impregnated sheet material an article having a principal surface and sides defining a corner, comprising the steps of attaching to one side of a sheet of such material a rigid backing member having at least two adjoining edges; attaching to said side of said sheet at least two additional backing members so as to provide adjacent each of said edges of said firstly mentioned backing member an additional backing member having an edge in spaced parallelism therewith, and ends of said additional backing members adjacent each other and in spaced relationship, whereby unbacked bendable portions of said sheet are defined between said edges of said backing members; beveling said ends divergently away from said sheet; recessing said sheet along said ends curving therefrom to the juncture of said edges of said firstly mentioned backing member; associating with each of said unbacked bendable portions a die having an edge adjacent one of said edges of said firstly mentioned backing member and a curved surface extending therefrom at a position adjacent said side of said sheet to a second die edge remote therefrom; heating said bendable portions to a postformable temperature; bending said bendable portions about said curved surface by bringing said secondly mentioned backing members to a position wherein said beveled ends are in adjacency, and said edges of said secondly mentioned backing members are adjacent said second die edges; and holding said sheet so bent until cool.
2. The process of forming from C-stage thermosetting resin-impregnated sheet material an article having a side and edges defining a corner, comprising the steps of attaching to a sheet of such material a rigid backing member having at least two adjoining edges; attaching to said sheet adjacent each of said edges an additional backing member of substantially the thickness of said firstly mentioned backing member, with an edge of each additional backing member being in spaced parallelism with an adjacent edge of said firstly mentioned backing member, and ends of said additional backing members adjacent each other and in spaced relationship, whereby said backing members define unbacked bendable portions of said sheet between said edges thereof; beveling said ends divergently away from said sheet with each end beveled in a plane parallel to the edge of said firstly mentioned backing member remote therefrom; recessing said sheet along said ends and along a curve to said juncture of said edges of said firstly mentioned backing member; associating in each of said areas of bend an additional reinforcing member having a curved surface interconnecting two edges, disposed so that a first edge of each of said additional reinforcing members is adjacent an edge of said firstly mentioned backing member, and said curved surface extends to said sheet at said edge of said firstly mentioned rigid backing member; heating said bendable portions of said sheet to a postformable temperature; bending said bendable portions so as to bring said beveled ends into substantial adjacency, and to bring each of said edges of said secondly mentioned backing members into adjacency with a second edge of an additional reinforcing member; and holding said material so bent until cool.
References Cited in the file of this patent UNITED STATES PATENTS 5 Cuppett Mar. 23, 1915 Nelson Jan. 7, 1936 Crouch Nov. 1, 1938 Crouch Nov. 1, 1938 10 6 Alexander Jan. 3, 1939 Green Apr. 25, 1939 Beach et a1. Dec. 30, 1947 Norquist Oct. 25, 1949 Norquist Jan. 30, 1951 Clements Feb. 20, 1951 Beach Aug. 11, 1953 FOREIGN PATENTS Great Britain Apr. 18, 1932

Claims (1)

1. THE PROCESS OF FORMING FROM C-STAGE THERMOSETTING RESIN-IMPREGNATED SHEET MATERIAL AN ARTICLE HAVING A PRINCIPAL SURFACE AND SIDES DEFINING A CORNER, COMPRISING THE STEPS OF ATTACHING TO ONE SIDE OF A SHEET OF SUCH MATERIAL A RIGID BACKING MEMBER HAVING AT LEAST TWO ADJOINING EDGES; ATTACHING TO SAID SIDE OF SAID SHEET AT LEAST TWO ADDITIONAL BACKING MEMBERS SO AS TO PROVIDE ADJACENT EACH OF SAID EDGES OF SAID FIRSTLY MENTIONED BACKING MEMBER AN ADDITIONAL BACKING MEMBER HAVING AN EDGE IN SPACED PARALLELISM THEREWITH, AND ENDS OF SAID ADDITIONAL BACKING MEMBERS ADJACENT EACH OTHER AND IN SPACED RELATIONSHIP, WHEREBY UNBACKED BENDABLE PORTIONS OF SAID SHEET ARE DEFINED BETWEEN SAID EDGES OF SAID BACKING MEMBERS: BEVELING SAID ENDS DIVERGENTLY AWAY FROM SAID SHEET; RECESSING SAID SHEET ALONG SAID ENDS CURVING THEREFROM TO THE JUNCTURE OF SAID EDGES OF SAID FIRSTLY MENTIONED BACKING MEMBER; ASSOCIATING WITH EACH OF SAID UNBACKED BENDABLE PORTIONS A DIE HAVING AN EDGE ADJACENT ONE OF SAID EDGES OF SAID FIRSTLY MENTIONED BACKING MEMBER AND A CURVED SURFACE EXTENDING THEREFROM AT A POSITION ADJACENT SAID SIDE OF SAID SHEET TO A SECOND DIE EDGE REMOTE THEREFROM; HEATING SAID BENDABLE PORTIONS TO A POSTFORMABLE TEMPERATURE; BENDING SAID BENDABLE PORTIONS ABOUT SAID CURVED SURFACE BY BRINGING SAID SECONDLY MEMTIONED BACKING MEMBERS TO A POSITION WHEREIN SAID BEVELED ENDS ARE IN ADJACENCY, AND SAID EDGES OF SAID SECONDLY MENTIONED BACKING MEMBERS ARE ADJACENT SAID SECOND DIE EDGES; AND HOLDING SAID SHEET SO BENT UNTIL COOL.
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132982A (en) * 1959-12-03 1964-05-12 Grimsinger Raymond Charles Method of bending printed electrical circuit panels
US3234489A (en) * 1962-06-16 1966-02-08 Felten & Guilleaume Carlswerk Rectangular waveguide
US3539425A (en) * 1966-11-09 1970-11-10 Arthur Marburg Method of assembling the walls of a box-like structure
US3943022A (en) * 1974-07-22 1976-03-09 Thermwood Corporation Method of forming sharp bends in plastic faced flat panels
US4376748A (en) * 1979-11-07 1983-03-15 Erven Waltherus J Van Method and apparatus for forming a plate with at least one profiled border
EP0288121A1 (en) * 1987-04-15 1988-10-26 Ploeg Lunteren B.V. Method for bending a solid plate from high pressure laminate of phenol resin and plate bending by application of the method
FR2629387A3 (en) * 1988-04-05 1989-10-06 Salvarani Ind Spa Method for the manufacture of a crimped top (board), made of plastic laminate having two joined layers
US20080286525A1 (en) * 2007-05-18 2008-11-20 Shaw Jon B Edge-wrapped panel and methods for edge-wrapping a panel
US20140291262A1 (en) * 2013-03-26 2014-10-02 Byung Kil Choe Panel and bookcase assembly using the same

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US1133106A (en) * 1913-12-20 1915-03-23 William Benton Cuppett Veneered and reinforced woodwork.
GB371344A (en) * 1930-02-25 1932-04-18 Herold Ag Improved method of forming objects from artificial resin
US2026698A (en) * 1934-06-07 1936-01-07 Wurlitzer Grand Piano Company Box and method of making it
US2134999A (en) * 1936-04-13 1938-11-01 Automatic Machinery Corp Round corner
US2135000A (en) * 1936-10-13 1938-11-01 Automatic Machinery Corp Round corner
US2142771A (en) * 1937-12-14 1939-01-03 Elmo E Alexander Bendable panel
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US2433643A (en) * 1943-11-11 1947-12-30 North American Aviation Inc Process of treating phenolic sheet
US2485648A (en) * 1944-10-03 1949-10-25 Glenn H Norquist Method of making metal-clad panels
US2539462A (en) * 1947-02-10 1951-01-30 Glenn H Norquist Metal counter top construction
US2542860A (en) * 1946-01-19 1951-02-20 Clements Macmillan Edge construction
US2648370A (en) * 1950-03-18 1953-08-11 North American Aviation Inc Method and apparatus for progressive forming of c-stage plastic material

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US1133106A (en) * 1913-12-20 1915-03-23 William Benton Cuppett Veneered and reinforced woodwork.
GB371344A (en) * 1930-02-25 1932-04-18 Herold Ag Improved method of forming objects from artificial resin
US2026698A (en) * 1934-06-07 1936-01-07 Wurlitzer Grand Piano Company Box and method of making it
US2134999A (en) * 1936-04-13 1938-11-01 Automatic Machinery Corp Round corner
US2155969A (en) * 1936-04-13 1939-04-25 Mengel Body Company Round corner joint
US2135000A (en) * 1936-10-13 1938-11-01 Automatic Machinery Corp Round corner
US2142771A (en) * 1937-12-14 1939-01-03 Elmo E Alexander Bendable panel
US2433643A (en) * 1943-11-11 1947-12-30 North American Aviation Inc Process of treating phenolic sheet
US2485648A (en) * 1944-10-03 1949-10-25 Glenn H Norquist Method of making metal-clad panels
US2542860A (en) * 1946-01-19 1951-02-20 Clements Macmillan Edge construction
US2539462A (en) * 1947-02-10 1951-01-30 Glenn H Norquist Metal counter top construction
US2648370A (en) * 1950-03-18 1953-08-11 North American Aviation Inc Method and apparatus for progressive forming of c-stage plastic material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132982A (en) * 1959-12-03 1964-05-12 Grimsinger Raymond Charles Method of bending printed electrical circuit panels
US3234489A (en) * 1962-06-16 1966-02-08 Felten & Guilleaume Carlswerk Rectangular waveguide
US3539425A (en) * 1966-11-09 1970-11-10 Arthur Marburg Method of assembling the walls of a box-like structure
US3943022A (en) * 1974-07-22 1976-03-09 Thermwood Corporation Method of forming sharp bends in plastic faced flat panels
US4376748A (en) * 1979-11-07 1983-03-15 Erven Waltherus J Van Method and apparatus for forming a plate with at least one profiled border
EP0288121A1 (en) * 1987-04-15 1988-10-26 Ploeg Lunteren B.V. Method for bending a solid plate from high pressure laminate of phenol resin and plate bending by application of the method
FR2629387A3 (en) * 1988-04-05 1989-10-06 Salvarani Ind Spa Method for the manufacture of a crimped top (board), made of plastic laminate having two joined layers
US20080286525A1 (en) * 2007-05-18 2008-11-20 Shaw Jon B Edge-wrapped panel and methods for edge-wrapping a panel
US7666269B2 (en) * 2007-05-18 2010-02-23 The Boeing Company Methods for edge-wrapping a panel
US20100062205A1 (en) * 2007-05-18 2010-03-11 The Boeing Company Edge-Wrapped Panel and Methods for Edge-Wrapping a Panel
US8181421B2 (en) 2007-05-18 2012-05-22 The Boeing Company Edge-wrapped panel and methods for edge-wrapping a panel
US20140291262A1 (en) * 2013-03-26 2014-10-02 Byung Kil Choe Panel and bookcase assembly using the same

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