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HOHLKUFE - Dokument EP0755347
 
PatentDe  


Dokumentenidentifikation EP0755347 29.06.2000
EP-Veröffentlichungsnummer 0755347
Titel HOHLKUFE
Anmelder Perstorp AB, Perstorp, SE
Erfinder PROVOT, Jean-Michel, F-57500 Saint-Avold, FR
Vertreter HOFFMANN · EITLE, 81925 München
DE-Aktenzeichen 69517167
Vertragsstaaten AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE
Sprache des Dokument EN
EP-Anmeldetag 31.03.1995
EP-Aktenzeichen 959160722
WO-Anmeldetag 31.03.1995
PCT-Aktenzeichen SE9500351
WO-Veröffentlichungsnummer 9528330
WO-Veröffentlichungsdatum 26.10.1995
EP-Offenlegungsdatum 29.01.1997
EP date of grant 24.05.2000
Veröffentlichungstag im Patentblatt 29.06.2000
IPC-Hauptklasse B65D 19/40
IPC-Nebenklasse B65D 19/32   

Beschreibung[en]

The present invention relates to an improved concept for a skid made of a polymeric material and consisting of a hollow profile. The skid is intended to be used with or constitute a part of a pallet, a container pallet or the like which preferably is made of a polymeric material and which is intended for transport and/or storage of goods.

A pallet or the like must, to be possible to convey on ball tracks or the like, downwards be provided with skids in order to eliminate the risk that it jams in for instance the ball track. Pallets or the like provided with skids, wherein the skids and preferably also the pallet are made of a polymeric material by injection moulding are disclosed in a large amount and with varying designs and functions. A skid can sometimes be for instance a solid profile formed as a lath or edging or be a hollow profile comprising a preferably closed longitudinal chamber. A skid containing a hollow longitudinal chamber is known in DE-A-4 128 883. A hollow profile exhibits advantages such as being material saving and shock dampening, but known concepts comprising a single hollow chamber exhibit disadvantages such as reduced stability and/or reduced carrying capacity due to i.a. the resulting design of the longitudinal chamber. A disproportional ratio between the width and the height of the chamber renders the upper central area of the skid liable to a tendency to bend downwards or inwards when charged. Furthermore, the material thickness of the chamber walls tends to be uneven. The difference in wall thickness between respective long and short sides of the skid and most of all the edges, with the weakest spots, becomes so large that strains reduce the strength, impact resistance, flexibility and stability of the polymeric material and/or results in a cracking, whereby the weakest spots are further weakened. The strains caused by material thickening, appears most of all at the edges and can be referred to the fact that the core temperature of the polymer after injection moulding exceeds the surface temperature to such an extent that the core shrinkage is larger than corresponding surface shrinkage. The difference in shrinkage results in a strong inner tension. Above disclosed properties give pallets provided with such polymeric skids a limited utilisation.

The invention, in its widest aspect, is as defined in Claim 1 of the accompanying claims.

A hollow profile is produced through injection moulding of a polymeric material using a gasinjection procedure. One type of gasinjection procedures involve a moulding tool having a rigid and defined moulding cavity which is entirely filled with a molten polymeric material. The moulding tool, furthermore, comprises one or more inlet channels enabling injection of gas into the core of the molten polymeric material and one or more outlet channels through which excess of molten polymeric material during injection of gas is evacuated out of the moulding cavity, whereby a substantially closed chamber constituting a hollow profile is formed. In an alternative procedure, a moulding tool with one or more variable moulding cavities, having one or more inlet channels for gasinjection, is used. The moulding cavity is in this case provided with at least one movable element, which can be moved in or out, whereby the volume of the moulding cavity increases or decreases. Molten polymeric material is injected into the moulding cavity when the movable element is in such a position that the volume of the moulding cavity is decreased to a defined filling of molten polymeric material. The movable element is, in conjunction with the gasinjection, moved outwards to a defined expansion of the moulding cavity, whereby a substantially closed hollow profile is formed.

Commonly used gasinjection procedures and companies of origin include:

  • AIRMOLD - Battenfeld
  • AIRPRESS - Klöckner Ferromatik
  • CINPRES (Contr. Internal Pressure Moulding) - Pearless Cinpress
  • ENCORE (Engineered Nitrogen Coresystem) - Encore Systems
  • GAIN (Gas-assisted Injection Molding) - Detroid Plastic Molding
  • GASMELT - Engel
  • GID (Gasinnendruckverfahren) - Dynamit-Nobel
  • GIP (Gasinnendruckprozeß) - Demag
  • GIT (Gasinjektiontechnik) - Schade

Through the present invention, it has quit unexpectedly been possible to obtain a skid to a load carrying article, such as a pallet, container pallet or the like, which skid comprises hollow profiles having above advantages without exhibiting said disadvantages. The skid comprises two or more longitudinal substantially closed hollow chambers surrounded by one or more defining walls. The defining walls are independently of an essentially even material thickness and the upper part of the walls constitute an upper horizontal surface at which the skid is attached to the pallet. The skid is made of a polymeric material and is injection moulded by means of a gasinjection procedure.

A more favourable ratio between width and height of a chamber and thus a more even wall thickness having no or very reduced tensions is by, in contrast to known concepts, allow the skid to comprise more than one longitudinal hollow chamber. Furthermore, the surface of the upper central area of the skid is thus more rigid without tendency to bend downwards and/ or inwards when charged. Embodiments including defining walls connected to each other by one or more joining reinforcing profiles, such as ribs, webs, girders or the like, result in a skid having a very high stability and load carrying capacity. The joining reinforcing profiles can be solid or hollow.

A pallet etc. is preferably provided with two or more skids according to embodiments of the invention, whereby the upper surface of the skid is attached to the load carrying part of the pallet by means of one or more joining solid or hollow legs or the like or whereby the skid is attached immediately to the load carrying part. Preferably, the skid constitutes a permanently attached part of the pallet, whereby the skid is applied by gluing or welding, such as chemical or ultrasonic welding. A skid can also constitute an integrated part of a pallet, whereby all parts of the pallet are produced as a unit in one single injection moulding. Alternatively, the skid can be detachable and attached by corresponding fastening means of the type pegs and holes, hooks and loops, longitudinal or transversal undercut groove and tenon, notches, rails or the like.

The invention is further explained in conjunction with enclosed Figures, wherein Figure 1 shows a crosscut of a skid according to a known concept. Figures 2-4 show crosscuts of three embodiments of a skid according to the invention. Figure 5 shows seen from beneath a perspective view of a pallet provided with three skids according to an embodiment of the invention.

  • Figure 1 shows, seen from a short side, a crosscut of a skid 1 according to a known concept. The skid 1, which comprises a longitudinal essentially closed hollow chamber 3 enveloped by a defining wall 6, is made of a polymeric material by injection moulding and the hollow chamber 3 is obtained by means of a gasinjection procedure. Upper part 9 of the wall 6 constitutes an upper horizontal surface 12 at which the skid 1 is attached to a pallet, container pallet or the like 2 (see Figure 5). A large and unfavourable ratio between width and height of the hollow chamber 3, and thus the skid 1, implies that its upper central area will be squeezed downwards and/or inwards when charged (indicated by arrow A). The unfavourable ratio between the width and the height of the hollow chamber 3, furthermore, results in an uneven material thickness of the wall 6 giving an increased material thickness at its two lower edges 19 and 20 being its weakest spots, whereby inner tensions give a reduced stability, impact resistance etc. and/or give rise to material cracking or checking.
  • Figures 2 and 3 show, seen from a short side, a crosscut of two embodiments of a skid 1 (see Figure 5) according to the present invention. The skids of Figures 2 and 3 have been produced similarly to and have same basic design as the skid of Figure 1. The two skids 1 comprise two hollow chambers 3 and 4 each giving a more favourably ratio between width and height of its hollow chambers 3 and 4. Each hollow chamber 3 and 4 are enveloped by a defining wall 6 and 7 and each upper part 9 and 10 of the walls 6 and 7 constitutes an upper horizontal surface 12 at which the skid 1 is attached to a pallet, a container pallet or similar 2 (see Figure 5). The more favourable ratio between the width and the height of the hollow chambers 3 and 4 gives a more even material thickness of the walls 6 and 7 of the hollow chambers 3 and 4 with lesser differences in wall thickness, especially at lower edges 19 and 20, whereby inner tensions resulting in decreased stability, impact resistance etc. are avoided. A dividing into two hollow chambers 3 and 4 having separate defining walls 6 and 7, furthermore, eliminates any tendency to force the horizontal surface 12, especially its upper central area, downwards and/or inwards, when charged. The skid 1 shown in Figure 3 is of the same embodiment as the one shown in Figure 2 with a difference that the enveloping walls 6 and 7 between each longitudinal hollow chamber 3 and 4 are connected by two reinforcing bars 14 and 15 providing a further increased stability to the skid 1.
  • Figure 4 shows, seen from a short side, a crosscut of a skid 1 (see Figure 5) according to an embodiment of the invention. The skid 1 has been produced similarly to and has same basic design as the skids of Figures 1-3. The Skid 1 comprises three hollow chambers 3, 4 and 5 resulting in a yet more favourable ratio between width and height of hollow chambers 3, 4 and 5, compared to the concept of Figure 1 and the embodiments of Figures 2 and 3. Advantages obtained with embodiments according to Figures 2 and 3 are further increased, such as reduced tendency to inner tensions at lower edges 19 and 20. Each of the hollow chambers 3, 4 and 5 is enveloped by a defining wall 6, 7 and 8 and each upper part 9, 10 and 11 of the walls 6, 7 and 8 constitutes an upper horizontal surface 12 to which the skid 1 is attached to a pallet, a container pallet or similar 2 (see Figure 5). A dividing into three hollow chambers 3, 4 and 5 give central surface 12 a very high stability without any tendency to bend downwards and/or inwards when charged.

Figure 5 shows, seen from below, a perspective view of a pallet 2 provided with three skids 1 according to an embodiment of the invention. The embodiment is similar to the embodiments of Figures 2 and 3. Each skid 1 of the pallet 2 comprises two hollow chambers 3 and 4 (see Figures 2 and 3). A recess 21 is formed between the two hollow chambers 3 and 4 (see Figures 2 and 3) and the enveloping walls 6 and 7. This recess is only visible from below and has a shape best shown in Figures 2 and 3. Each skid 1 is affixed to a load carrying part 13 of the pallet 2 by means of connecting legs 16, 17 and 18 attached to an upper horizontal surface 12 (see Figures 2 and 3) of said skid 1. Enveloping walls 6 and 7 of the hollow chambers 3 and 4 are adjacent the legs 16, 17 and 18 downwards provided with a joining and reinforcing bar 15.

While particular embodiments of the invention have been shown, it will be understood, of course, that the invention is not limited thereto since many modifications may be made, and it is, therefore, contemplated to cover by the appended claims any such modifications as fall within the scope of the appended claims.


Anspruch[de]
  1. Kufe (1) für einen lasttragenden Transport und/oder Aufbewahrungsartikel (2), wie eine Palette oder eine Container-Palette, wobei die Kufe (1) ein im wesentlichen geschlossenes Hohlprofil in Längsrichtung ist mit Wänden von einer im wesentlichen gleichmäßigen Materialdicke, die aus Polymermaterial durch Spritzguß unter Verwendung eines Gaseinspritzverfahrens gefertigt werden, dadurch gekennzeichnet, daß die Kufe (1) zwei oder mehr im wesentlichen geschlossene Hohlkammern (3, 4, 5) in Längsrichtung umfaßt, und daß jede Kammer durch eine unterschiedliche Wand (6, 7, 8) definiert ist, wobei die obere Teile der Wände miteinander so verbunden sind, daß sie eine obere horizontale Oberfläche (12) bilden, wobei die Kufe (1) mit der Oberfläche (12) an dem Artikel (2) angebracht ist.
  2. Kufe (1) nach Anspruch 1, dadurch gekennzeichnet, daß die unterschiedlichen Wände (6, 7, 8) miteinander durch ein oder mehrere verbindende und verstärkende Profile verbunden sind, wie Rippen, Verstärkungsrippen, Balken oder ähnliches (14, 15), und wobei die Profile massiv oder hohl sind.
  3. Kufe (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Oberfläche (12) der Kufe (1) an einem lasttragenden Teil (13) des Artikels (2) durch einen oder mehrere verbindende feste oder hohle Füße oder ähnliches (16, 17, 18) angebracht ist.
  4. Kufe (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Oberfläche (12) der Kufe (1) an sich an einem lasttragenden Teil (13) des Artikels (2) befestigt ist.
  5. Kufe (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Kufe (1) ständig an dem Artikel (2) angebracht ist, wobei die Kufe (1) durch Kleben oder Schweißen, wie chemisches oder Ultraschallschweißen, angebracht ist.
  6. Kufe (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Kufe (1) ein integrierter Teil des Artikels (2) ist, wobei alle Teile des Artikels (2) und der Kufe (1) als eine Einheit in einem einzigen Spritzguß gefertigt werden.
  7. Kufe (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Kufe (1) ein lösbarer Teil des Artikels (2) ist, wobei die Kufe (1) durch entsprechende Befestigungseinrichtungen, wie sich dehnende Dübel und Löcher, Haken und Schlingen, hinterschnittene Nuten und Federn in Längs- oder Querrichtung, Nocken und/oder Schienen, angebracht ist.
Anspruch[en]
  1. Skid (1) to a load carrying transport and/or storage article (2), such as a pallet or a container pallet, the skid (1) being a longitudinally substantially closed hollow profile with walls of an essentially even material thickness made of a polymeric material by means of injection moulding using a gas injection procedure, characterized in that the skid (1) comprises two or more longitudinal substantially closed hollow chambers (3, 4, 5), and that each chamber is defined by a distinct wall (6, 7, 8), the upper parts of said walls being connected to each other so as to form an upper horizontal surface (12) at which surface (12) the skid (1) is attached to the article (2).
  2. Skid (1) according to Claim 1 characterized in that the distinct walls (6, 7, 8) are connected to each other by means of one or more joining and reinforcing profiles, such as ribs, webs, bars, girder or the like (14, 15), the profiles being solid or hollow.
  3. Skid (1) according to Claim 1 or 2 characterized in that the surface (12) of the skid (1) is attached to a load carrying part (13) of the article (2) by means of one or more joining solid or hollow legs or the like (16, 17, 18).
  4. Skid (1) according to Claim 1 or 2 characterized in that the surface (12) of the skid (1) per se is attached to a load carrying part (13) of the article (2).
  5. Skid 1 according to any of Claims 1-4 characterized in that the skid (1) is permanently attached to the article (2), whereby the skid (1) is applied by means of gluing or welding, such as chemical and ultrasonic welding.
  6. Skid (1) according to any of the Claims 1-4 characterised in, that the skid (1) is an integrated part of the article (2), whereby all parts of the article (2) and the skid (1) are produced as a unit in a single injection moulding.
  7. Skid (1) according to any of the Claims 1-4 characterised in, that the skid (1) is a detachable part of the article (2), whereby the skid (1) is attached by corresponding fastening means, such as expanding pegs and holes, hooks and loops, longitudinal or transversal undercut groove and tenon, notches and/or rails.
Anspruch[fr]
  1. Patin (1) pour un article (2) conçu pour transporter en la portant et/ou pour stocker une charge telle qu'une palette ou une palette formant conteneur, le patin (1) étant constitué d'un profilé creux pratiquement fermé longitudinalement, ayant des parois d'une épaisseur de matériau sensiblement uniforme constituées d'un matériau polymère, transformé par moulage par injection en utilisant un processus d'injection à gaz, caractérisé en ce que le patin (1) comprend deux ou plusieurs chambres longitudinal creuses (3, 4, 5) pratiquement fermées ou plus, et en ce que chaque chambre est définie par une paroi (6, 7, 8) distincte, les parties supérieures desdites parois étant connectées les unes aux autres pour former une surface horizontale supérieure (12), surface sur laquelle le patin (1) est fixé à l'article (2).
  2. Patin (1) selon la revendication 1, caractérisé en ce que les parois (6, 7, 8) distinctes sont reliées les unes aux autres au moyen d'un ou plusieurs profilés de jonction et de renforcement, tel que des nervures, des âmes-voiles, des barres, des treillis ou analogues (14, 15), les profilés étant massifs ou creux.
  3. Patin (1) selon la revendication 1 ou 2, caractérisé en ce que la surface (12) du patin (1) est fixée à une partie support de charge (13) de l'article (2) au moyen d'une ou plusieurs pattes de jonction, massives ou creuses, ou analogues (16, 17, 18).
  4. Patin (1) selon la revendication 1 ou 2, caractérisé en ce que la surface (12) du patin (1) en soi est fixée à une partie support de charge (13) de l'article (2).
  5. Patin (1) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le patin (1) est fixé en permanence à l'article (2), de manière que le patin (1) soit appliqué au moyen de collage ou soudage, tel que par un soudage chimique et aux ultrasons.
  6. Patin (1) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le patin (1) est une partie intégrante de l'article (2), de manière que toutes les parties de l'article (2) et le patin (1) soient produites d'un tout dans un moulage par injection unique.
  7. Patin (1) selon l'une quelconque des revendications 1 à 4, caractérisé an ce que le patin (1) est une partie détachable de l'article (2), de manière que le patin (1) soit fixé par des moyens de fixation correspondants tels que des chevilles expansibles et des trous, des crochets et des boucles, des gorges et des tenons longitudinaux ou transversaux, dotés d'une contre-dépouille, des encoches et/ou des rails.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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