US2649135A - Process for the production of insulating panels, door panels, furniture board or the like - Google Patents

Description

Aug. 18, 1953 w. PRASE 2,649,135

PROCESS FOR THE PRODUCTION OF INSULATING PANELS, DOOR PANELS. FURNITURE BOARD OR THE LIKE Filed Oct. 28, 1950 Fig. 1

TR? A 2% Fig.2

jwe/vroe. Werner Prase 5y I Mm! -r ATTORNEYS Patented Aug. 18, 1953 PROCESS FOR THE PRODUCTION OF INSU- LATING PANELS, DOOR PANELS, FURNI- TUBE BOARD OR THE LIKE Werner Prase, Stuttgart, Germany Application October 28, 1950, Serial No. 192,656 In Germany October 29, 1949 7 Claims. (01. 15428) This invention concerns a process for the production of insulating panels, door panels, furniture board and the like of the type which are filled with sound or heat insulating materials and which are surfaced on both their wide faces with, for instance, wood veneers, plywood sheets or compressed sheets.

The aim of the invention is to produce such panels in a simple and economical manner and to provide them with jointing ledges so that rigid panels are created which may be treated according to the usual woodworking process, in which the surfacing material adheres satisfactorily onto the jointing ledges and the filling material, so that they will not come loose at their inner sides and do not blister. Moreover it is desired to use also as filling materials, glass-wool, slag-wool, stone-wool, peat mould and other inexpensive materials.

According to the present invention a process for the manufacture of insulating panels, door panels, furniture board or the like which are filled with a filling material, are surfaced on their two wide faces with suitable material characterised in that jointing ledges to form the outer edges of the respective panel or board sides are, before the insertion of the filling material, laid on the lower panel side or surfacing, which is provided with a film of glue or the like, the ledges, or edge strips, also forming, in combination with key strips inserted in vertical grooves therein the limiting transverse walls for the filling material, and that the upper sheets of surfacing material, also provided on their under side with a film of glue, under pressure cause the key strips to enter the grooves completely, the filling material being also compressed, both surface sheets or panel sides being glued together at the jointing ledges. The ledges, which correspond to the thickness of the completely compressed layer of filling material, between the two I panel sides may each be half the finished distance between the panel sides, whereby the two sides are completely identical i. e. they both have a trapezoidal cross section with straight outer sides and oblique inner sides, their bases resting on the respective panel sides and the narrower inner sides being interrupted by longitudinal slots into each of which the respective ends of a narrow and upright key strip engages. Similarly dowels can be glued on to the inner sides of the ledges as will be explained hereinafter.

The invention will be described further with reference to the accompanying drawings in which:

,ends of the dowels l4.

Figs. 1 and 2 show respectively in partial cross section, a furniture panel before and after the pressing process, and

Fig. 3 is an end view in section corresponding to Fig. 1. y

A lower panel side 2 is laid on the fioor of a press mould l capable of being heated if desired and is of any desired form, the upper face of which (Fig. 1), at least at the points at which ledges l1, H] are positioned, is provided with a film of glue or synthetic resin. The marginal ledge, or edge strip ll lying against the side wall of the mould i has a cross section of trapezoidal shape. Its upper face is interrupted by a deep longitudinal groove l9 and from the mouth of the longitudinal groove I9 is inclined away from the mould towards the inner space 22. Further ledges [0 are joined transversely to the marginal ledges I! at predetermined points, the cross section of which ledges can be seen from Fig. 3 and which are provided with bores I2 for the reception of dowels l4. Triangular headings 25 of small cross section are laid transversely above the ledges Ill. Into the longitudinal grooves l9 of the marginal ledges l1 glued on to panel side 2 is inserted (Fig. 1) the lower longitudinal edge of a key strip 2| on the upper longitudinal edge ,of which a second marginal ledge I8 is stuck with a corresponding longitudinal groove 20. In addition, upper ledges II are fixed on the upper In this manner as is shown in Fig. 1 without the upper panel side [5 being laid on-packing or filling material of any desired kind, for example, slag wool, is charged into the space 22 so that the inclined edges 23 of the marginal ledges I! and the key strip 2| form the lateral limitation of the space 22. If

new the upper panel side I5 has spread on its lower face a film of glue or synthetic resin and is pressed downwardly by means of a correspondingly wide press die 24 until (Fig. 2) the surfaces, which are turned towards one another and provided with a glue film at the marginal ledges l1, 53, make contact with one another and the thin triangular headings 25 are partially crushed there is achieved a good and permanent connection of the panel sides or surfaces 2, IS with one another above the marginal ledges l8 and with the packing substance pressed together in a narrow space 22a. Moreover, the ledges [0, II with their dowels M and the triangular beadings 25 glued thereto then give the panel itself a rigid support if packing materials are employed which are not compounded with a binding means.

If the filling materials are mixed with a binding agent it is possible to dispense with the ledges II II and their dowels M, as the filling materials containing the binding agent enable a sufficiently firm and rigid connection with the panel sides or surfaces. In some cases the corresponding upper half 8 to the ledge IT can be dispensed with, if one makes the lower ledge ll so thick that at the end of the pressing operation (pressing stroke) the lower side of the panel I5 comes to rest on the upper side of the ledge H, whereby obviously also the key strip 2! must be pressed completely into the correspondingly deep slot IQ of the lower ledge I I. In this case also the inner inclined edge 23 of the glueing ledge ll forms together with the key strip 2! which projects over and above the slot Hi the inner limit of the space '22, when it is supplied with the incompressed filling material before the upper cover plate has been fitted. The inclined edge 23 has hereby a special purpose because all the filling material banked up near the key strip 21 can slide to the inside on an inclined path on pressing and not disturb the pressing process. As soon as the glue or synthetic material has hardened in the pressing position (Fig. 2), the upper die 24 of the press can be pulled back and the complete panel can be taken out of the mould. The panel is distinguished by stability and easy workability and is cheap in production, as the glueing edges around the panel can be fitted by the simplest process in a single working step. Naturally, it is not necessary to provide all sides of the panel with ledges if one, as it is the case with numerous furniture panels, for instance only needs glueing ledges on two or three faces. The width of the ledges IT, 18 is so chosen that the glueing edge of the ledge is wide enough so that if necessary it can be subsequently further machined. The bore holes I2, [3, and the dowels 14 are preferably provided with glue in order to achieve a firm connection of the parts with one another. Basically it is all the same whether the cover plates 2, 15 or the ledges I1, l8, l0, H are spread with glue. The ledges H or [8 may be produced as integral frames.

What I claim is:

l. A process for the manufacture of a panel member having filler material sandwiched between the panel faces and bounded by the panel edges, said process comprising the steps of spreading adhesive onto the inner surface of a panel. facing member and adjacent the edges thereof, then placing panel edge strips along said edges and against said adhesive-covered surface, each of said panel edge strips having an inclined face facing toward the interior of the panel member and also having a groove extending lengthwise of said edge strip substantially perpendicular to said inner surface having adhesive thereon, then placing a key strip at the mouth of each of said grooves, each key strip and associated panel edge strip together providing a wall along the edge of the panel facing member with which they are associated, then placing compressible filler material in the space bounded by said walls, spreading adhesive adjacent the edges of a second panel facing member, then placing the surface of said second panel facing member having the adhesive thereon against each key strip, and then pressing said second panel facing member toward the firstmentioned panel facing member to compress the filler material therebetween and simultaneously force each key strip into the groove of the panel edge strip with which said key strip is associated, the inclined faces on said panel edge strips urging the filler material toward the interior of the panel member.

2. A process for the manufacture of a panel member having filler material sandwiched between the panel faces and bounded by the panel edges, said process comprising the steps of spreading adhesive onto opposite surfaces of each of a plurality of panel edge strips, placing an adhesive-covered surface of each of said panel edge strips against the inner surface of a panel facing member and adjacent the edges thereoof, each of said panel edge strips having an inclined face facing toward the interior of the panel member and also having a groove extending lengthwise of said edge strip substantially perpendicular to said inner surface of the panel facing member, then placing a key strip at the mouth of each of said grooves, each key strip and associated panel edge strip together providing a wall along the edge of the panel facing member with which they are associated, then placing compressible filler material in the space bounded by said wall, then placing the surface of a second panel facing member against each key strip adjacent the edges of said second panel facing member, and then pressing said second panel facing member toward the first-mentioned panel facing member to compress the filler material therebetween and simultaneously force each key strip into the groove of the panel edge strip with which said key strip is associated, the inclined faces of said panel edge strips urging the filler material toward the interior of the panel member.

3. A process for the manufacture of a panel member having filler material sandwiched between a pair of panel faces and bounded by the panel edges, said process comprising the steps of spreading adhesive onto the inner surface of each panel facing member adjacent the edges thereof, then placing panel edge strips along said edges and against the adhesive-covered surfaces of each of said pair of panel facing members, each of said panel edge strips having an inclined face facing toward th interior of the panel member and also having a groove extending lengthwise thereof substantially perpendicular to the adhesive-covered inner surface with which said edge is associated, the respective edge strips and grooves associated with each panel facing member being similarly disposed whereby they may be positioned in registry with and opposite each other, then placing a key strip at the mouth of each groove in each edge strip associated with one of said panel facing members, each key strip and associated panel edge strip together providing a wall along the edge of the panel facing member with which they are associated, then placing compressible filler material in the space bounded by said walls, then positioning the other panel facing member in registry with an opposite the panel facing member having the key strips associated therewith whereby said key strips may enter the grooves in the edge strips associated with said second panel facing member, and then pressing said second panel facing member toward the first-mentioned panel facing member to compress the filler material therebetween and simultaneouly force each key strip into the panel edge groove associated therewith to provide a composite panel edge structure, the inclined faces on said panel edge strips urging the filler material toward the interior of the panel member.

4. A process according to claim 3 in which reinforcing strips are placed across the inner surface of the first-mentioned panel facing member prior to the adding of the compressible filler material, each of said reinforcing strips having a plurality of openings therein, placing dowels in the mouths of said openings, and simultaneously forcing said dowels into the openings in said reinforcing strips when the second panel facing member is pressed toward the first-mentioned panel facing member.

5. In a process for the manufacture of a panel member having filler material sandwiched between the panel faces and bounded by the panel edges, the method of forming a panel edge which comprises the steps of spreading adhesive onto the inner surface of the panel facing member adjacent an edge thereof, placing a panel edge strip along said edg and against said adhesivecovered surface, said edge strip having an inclined fa-ce facing toward the interior of the panel member and also having a groove extending lengthwise of the edg strip substantially perpendicular to said adhesive-covered inner surface, then placing a key strip at the mouth of said groove, spreading adhesive onto the inner surface of a second panel facing member adjacent an edge thereof, then placing the adhesivecovered surface of said second panel facing member against said key strip, said respective edges of said panel facing members being of similar size and shape whereby they may be positioned in substantial registry, and then pressing said second panel facing member toward the first panel facing member to force said key strip into the panel edge strip groove until said strip is fully seated in said groove and the adhesivecovered inner surface of said second panel facing member is pressed into contact with said edge strip.

6. In a process for the manufacture of a panel member having filler material sandwiched between the panel faces and bounded by the panel edges, the method of forming a panel edge which comprises the steps of spreading adhesive onto opposite surfaces of an edge strip, placing an adhesive-covered surface of said edge strip against the inner surface of a first panel facing member and adjacent an edge thereof, said edge strip having an inclined face facing toward the interior of the panel member and also having a groove extending lengthwise of said edge strip substantially perpendicular to said inner surface of the panel facing member, then placing a key strip at the mouth of said groove, then placing the inner surface of a second panel facing member against said key strip adjacent an edge of said second panel facing member, said respective edges of said panel facing members being of similar size and shape whereby they may be positioned in substantial registry, and then pressing said second panel facing member toward the first panel facing member to force said key strip into the panel edge strip groove until said strip is fully seated in said groove and said second panel facing member is pressed into contact with an adhesive-covered surface of said edge strip.

7. In a process for the manufacture of a panel member having filler material sandwiched between a pair of panel faces and bounded by the panel edges, the method of forming a panel edge which comprises the steps of spreading adhesive onto th inner surface of each of said panel facing members adjacent an edge of each of said members, said edges being of similar size and shape whereby they may be positioned in substantial registry, then placing an edge strip against each adhesive-covered surface and along each panel facing member edge, each of said panel edge strips having an inclined face facing toward the interior of the panel member and also having a groove extending lengthwise of said edge strip substantially perpendicular to the adhesive-covered surface against which said edge strip is placed, said respective edge strips and grooves associated with said panel facing members being similarly disposed whereby they may be positioned in registry with and opposite each other, then placing a strip at the mouth of the groove in the edge strip associated with one of said panel facing members, then positioning the other panel facing member opposite the firstmentioned panel facing member so that the key strip may enter the groove in the edge strip associated with said second panel facing member, and then pressing said second panel facing member toward the first-mentioned panel facing member to force said key strip into seated position in each of said grooves and bring said edge strips in contact with each other to provide a composite panel edge strip.

WERNER PRASE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,863,800 Loetscher June 21, 1932 1,885,364 Lewis Nov. 1, 1932 2,073,896 Loetscher Mar. 16, 1937 2,140,210 Schenk Dec. 13, 1938 2,157,622 Neesen et al May 9, 1939 2,385,352 Davis Sept. 25, 1945

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