CA1337489C - Membrane packing - Google Patents
Membrane packingInfo
- Publication number
- CA1337489C CA1337489C CA000616799A CA616799A CA1337489C CA 1337489 C CA1337489 C CA 1337489C CA 000616799 A CA000616799 A CA 000616799A CA 616799 A CA616799 A CA 616799A CA 1337489 C CA1337489 C CA 1337489C
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- CA
- Canada
- Prior art keywords
- container
- article
- membrane
- frame
- spacer
- Prior art date
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Abstract
An improved packing device which holds an article being shipped between membranes. The membranes provide shock adsorption through their own resiliency and by allowing motion when forces in excess of the frictional limit are applied.
A pair of rigid frames and having central openings covered by an attached pliable material, form spacers which are forced in intimate contact with a fragile article within its shipping container to absorb shocks, flexion and torsion of the container due to shipping and handling loads. The spacers can be a box-like structure with at least one open face covered with a flexible membrane. The contour of the other faces of the structure are shaped and dimensioned to match the internal geometry of the container. In some applications, the spacer structure is a wedge that fits in one corner of the container.
Two to four such wedges are typically used to support the object. The framed membranes offer a versatile substitute for a variety of common packing inserts.
A pair of rigid frames and having central openings covered by an attached pliable material, form spacers which are forced in intimate contact with a fragile article within its shipping container to absorb shocks, flexion and torsion of the container due to shipping and handling loads. The spacers can be a box-like structure with at least one open face covered with a flexible membrane. The contour of the other faces of the structure are shaped and dimensioned to match the internal geometry of the container. In some applications, the spacer structure is a wedge that fits in one corner of the container.
Two to four such wedges are typically used to support the object. The framed membranes offer a versatile substitute for a variety of common packing inserts.
Description
`~ 1 1 337~8~
SPECIFICATION
Technical Field This invention relates to packaging, more specifically to packing and package inserts for retA;n;ng and suspension of variously shaped items. It deals with a new and improved construction of pAck;ng and retA;ners within external packages for protecting items exposed to shipping and handling loads.
Cross-reference to Related Parent Application Thi~ application, being a divisional of parent CAnA~;an application serial n~mher 599,694 filed May 12, 1989, discloses subject matter claimed in the parent application as well as in this application.
Backqround Art Although a retail package can be decorative and encourage purchase of the enclosed article, the primary purpose of any packaging is to protect the article from shipping and handling damage. Auxiliary packing forms and materials within the package also may have other functions, but again, the primary function is to protect the article from shipping and handling damage.
Packing materials and forms can be separated into 2 categories; 1) interface materials which directly contact the article being protected, and 2) structural materials which support and/or reinforce package and interface materials.
SPECIFICATION
Technical Field This invention relates to packaging, more specifically to packing and package inserts for retA;n;ng and suspension of variously shaped items. It deals with a new and improved construction of pAck;ng and retA;ners within external packages for protecting items exposed to shipping and handling loads.
Cross-reference to Related Parent Application Thi~ application, being a divisional of parent CAnA~;an application serial n~mher 599,694 filed May 12, 1989, discloses subject matter claimed in the parent application as well as in this application.
Backqround Art Although a retail package can be decorative and encourage purchase of the enclosed article, the primary purpose of any packaging is to protect the article from shipping and handling damage. Auxiliary packing forms and materials within the package also may have other functions, but again, the primary function is to protect the article from shipping and handling damage.
Packing materials and forms can be separated into 2 categories; 1) interface materials which directly contact the article being protected, and 2) structural materials which support and/or reinforce package and interface materials.
-2- I 33748~
Interface and structural packing mateeials and forms should be small, light weight, pleasing in appearance and low in cost. However, at the same time, the packing must be able to withstan(~
sllipping and handling loads transmitted by the external package or container without transmitting excessive amounts of these loads to the article beinq protected. Interface and structural packing must also be able to perform it's functions within the limitations of a difficult environment, including extremes of temperature, altitude (pressure), shock, vibration, and stacking of containers and or articles within containers.
INTEREACE MATERIALS AND EORMS
A variety of approaches to packing articles within shipping containers are currently available.
One approach uses interface and structural fill materials within a container, possibly the package itself. The fill material may be foam, wood chips, tissue (paper), excelsior, gray chip dunnage, dimpled kraft, foam sheeting, nèwspaper or elastomeric materials.
A modification of this combined fill or interface and structural material approach uses -_3_ 1 337489 inflatable pillows or expanding materials such as foam in place compounds withln a container.
Example of a pillow type of packing is found in United States Patent Number 3,521,743. The pillow 5 distributes the shipl~ing and handling loads to the many contact points with the article being shipped.
A second related approach is to provide a specially shaped restraint within the container. The special shape again distributes shipping and handling loads to the article, but does not require a complete fill within the container. The special shape may be obtained by molding or pre-forming the restraint to intimately surround the article. This can be accomplished by die cut material stand-offs, built-lS pads, end caps and spacers gerlerally made from corrugated or solid foam materials. Except for the deformation of the material, the full shipping and handling loads are transmitted to the fragile article.
In another approach, the article is suspended around a structure by attaching elastic cords or other deformable t~nsion type devices acting against gravity and anticipated shipping and handling loads. The sructure may be separate from or combined into the external container. Tllis _4_ 1 337489 approach is especially useful in withstanding large shipping and handling shock loads with minimum transfer of the load to the article being shipped.
Another approach cradles and suspends the article within a recess in a sheet or film, instead of cords or individual tension devices. Sheets may be include deformable wrapping films, liners, pads, sacks, or other materials. These cradles suspend the article primarily aga-inst gravity, allowing limited swing movement in other directions within the container (not a complete fill of the container). These flexible cradles may be suspended and/or further restrained by other rigid materials within the external container, or the external container itself. Examples of internal rigid support materials include struts and stays, cardboard or stiff paper frames.
In a modification to the cradle/hammock approach, 2 or more films are used to obtain suspension type of support and immobilize or encapsulate the aeticle. Heat shrinkable films are a common method of achieving encapsulation. Two sheets or films are held together, encapsulating and/or shrunk around the article and supported from a rigid member. Examples of encapsulated hammock or _5_ 1 337489 cradle suspension type of packing are shown in United States Patent Numbers 4,606,460; 4,606,459;
Interface and structural packing mateeials and forms should be small, light weight, pleasing in appearance and low in cost. However, at the same time, the packing must be able to withstan(~
sllipping and handling loads transmitted by the external package or container without transmitting excessive amounts of these loads to the article beinq protected. Interface and structural packing must also be able to perform it's functions within the limitations of a difficult environment, including extremes of temperature, altitude (pressure), shock, vibration, and stacking of containers and or articles within containers.
INTEREACE MATERIALS AND EORMS
A variety of approaches to packing articles within shipping containers are currently available.
One approach uses interface and structural fill materials within a container, possibly the package itself. The fill material may be foam, wood chips, tissue (paper), excelsior, gray chip dunnage, dimpled kraft, foam sheeting, nèwspaper or elastomeric materials.
A modification of this combined fill or interface and structural material approach uses -_3_ 1 337489 inflatable pillows or expanding materials such as foam in place compounds withln a container.
Example of a pillow type of packing is found in United States Patent Number 3,521,743. The pillow 5 distributes the shipl~ing and handling loads to the many contact points with the article being shipped.
A second related approach is to provide a specially shaped restraint within the container. The special shape again distributes shipping and handling loads to the article, but does not require a complete fill within the container. The special shape may be obtained by molding or pre-forming the restraint to intimately surround the article. This can be accomplished by die cut material stand-offs, built-lS pads, end caps and spacers gerlerally made from corrugated or solid foam materials. Except for the deformation of the material, the full shipping and handling loads are transmitted to the fragile article.
In another approach, the article is suspended around a structure by attaching elastic cords or other deformable t~nsion type devices acting against gravity and anticipated shipping and handling loads. The sructure may be separate from or combined into the external container. Tllis _4_ 1 337489 approach is especially useful in withstanding large shipping and handling shock loads with minimum transfer of the load to the article being shipped.
Another approach cradles and suspends the article within a recess in a sheet or film, instead of cords or individual tension devices. Sheets may be include deformable wrapping films, liners, pads, sacks, or other materials. These cradles suspend the article primarily aga-inst gravity, allowing limited swing movement in other directions within the container (not a complete fill of the container). These flexible cradles may be suspended and/or further restrained by other rigid materials within the external container, or the external container itself. Examples of internal rigid support materials include struts and stays, cardboard or stiff paper frames.
In a modification to the cradle/hammock approach, 2 or more films are used to obtain suspension type of support and immobilize or encapsulate the aeticle. Heat shrinkable films are a common method of achieving encapsulation. Two sheets or films are held together, encapsulating and/or shrunk around the article and supported from a rigid member. Examples of encapsulated hammock or _5_ 1 337489 cradle suspension type of packing are shown in United States Patent Numbers 4,606,460; 4,606,459;
3,853,220; and 2,501,570. Because of the encapsulated approach, swing type of movements are essentially eliminated and except for the deformation of the shrink wrap sheets, the full shipping and handling loads are transmitted to the wrapped, posslbly fragile article.
This encapsulated approach has also been used for external packaging, as well as packing within a shipping or handling package. A pre-formed rigid frame, container or package is used to anchor the encapsulated article. The container and article withstand the full shipping and handling loads.
Examples include blister packs and rolled drawirlg containers. These rigid or semi-rigid containers can also be attached to a card to provide a means for rack or hook display. In a modification of this approach, the rigid container is also transparent allowing the customer to fully view the article.
In a further modification, package is not preformed, but is shrunk fit or formed around the article while the packaging material is flexible (for example using vacuum to draw a thermosetting plastic film around the article), then setting -6- ~ 33748~
(e.g., thermo-setting material) the previously flexible material to form a rigid container. This approach immobilizes the article and completely encapsulates it.
In still another approach, the membranes encapsulating the article are also used to form a pillow type of support, as previo~sly described. At least one of the membranes is extended to enclose a volume or sealed to another air tight structure to enclose a volume and form an inflatable pillow-like chamber. The pillow may be air tight, or orificed to act as a fluid damped shock absorbing mechanism.
An Example of an encapsulated and pillow like support is shown in United States Patent Number 4,491,225.
STRUCTURAL MATERIALS AND EORMS
Nearly all of the interface packing materials, especially sheet type of packing approaches, require rigid support. Support may be by direct attachment to the external package, but is commonly an internal separator or rigid packing insert.
Planar reinforcing structural material are common. A typical internal separator or insert 5 composed of folded or cross-locking cardboard 7_ 1 33748~
sheets. ~olds or cross-locking provide structural integrity in several directions. Eolds or cross-locking orientation must be retained in position in order to obtain this structural integrity.
Interface material support frames are provided in a variety of situations. Interface materials may be attached or blocked by packing support frames.
Corner structural packing forms are also common. Corner forms center and protect the article, especially i~ the external package is insufficient to protect the article from shocks and loads emanating from the corner (e. g., dropping package on corner). These corner packings may be made from cross-braced cardboard-like material or solid inserts placed at the corners.
All the above described approaches rely UpOIl one or more of the following techniques:
1) the article is encapsulated or otherwise attached to a rigid, structural packing or package member by means of a deformable interface packing member, and/or 2) the a~ticle is unattached, but suspended or cushioned by loosely fitting wrap, inflated, filled or crushable interface packing materials, or -8- I 33748q 3) the aeticle is attached and supported by rigid, but deformable or crushable packing or package material.
~- Special problems occur when shock and shipmerlt protection of a large flat and fragile object, such as framed lithogeaphic prints and glass art panels, is desired. The container for these large flat objects is also typically a larger flat container.
If the container is dropped and one corner hits the ground first, the impact force is translnitted to only a corner of the fragile object, possibly twisting or breaking it. Common packirlg inserts (foam, pillows, etc.) may reduce and distribute the impact force, but all of the peior aet transmit the shock force without limits. These torslonal loads of large flat objects, further compounds problems and the chance of breakage.
- Another problem with protecting long flat objects is flexion. When a long glass panel is 2~ supported only along one or more edges, the object weight and shipping loads tends cause flexlon of the object, such as a glass panel. Additional packing lnserts may be required to support the glass at multiple interior points.
Dlsclosure of Invention The principal and secondary objects of the invention are:
to provide a packing which suspends a fragile article in a frame without attachment to or encapsulation of the article;
to provide a packing which provides an elastic, floating support, but strictly limit the unacceptable shipping and handling loads transmitted to the fragile article in specific directions to a specific upper limit;
to provide a packing which does not always require pre-formed and separate rigid material separators or inserts within the container;
to provide protection from dust and other contaminants;
-to provide a packing which provides a stand off within the package, but can be stored flat;
to provide a packing which allows the articlé to be visually inspected without disassembly;
to provide a packing which reduces f ill ing times; and .
to provide a low cost/weight packing which does not require special post-packing treatment.
-~ These and other objects are achieved by frictional contact sandwichlng the article between two pliable and flexible membranes, which are each attached to a separate supporting frame. The frames have a central opening over which the pliable material is attached. Attachment of the pliable material may also be used to secure loose folds, flaps, and separators to the frame, creating a rigid structural packing form. The frames are normally separated, but may be attached to each other or may be biased towards each other by initially loose fitting inserts or flaps to maintain a high friction contact between the pliable membranes and the article to be shipped.
- The friction contact limits handling and shipping shock loads that can be transmitted to the protected item.
Multiple items and loose fitting separators may also be frictionally held between the pliable materials as long as space is available within the frame opening. The technlque does not require attachment of the article or spacers since the 1 33748q pression of two pliable membranes against the article and separators is sufficient to immobilize ., it against forces up to a frictional limit. The pliable membrane may even be punctured (accidentally or otherwise) by sharp points on the article without compromising structural integrity and further limiting loads on the sharp protrusion.
Even if not punctured, sharp points on the article cause the membrane to deform at these points, which further distributes the shipping and handling loads. The fragile protruding article may also be protected against dust and other contaminants by the pliable membranes, even if punctured as the membrane remains tight around the protrusion.
lS Exceptionally heavy articles may be partially supported by the pliable membrane frictional - contact.
Large transient drop and/or shock loads to the fragile article ar limited by the trampoline like action of the membrane in one dieection and friction resistance/deformation and ultimate movement of the article between the membranes in other directions, at least until the article moves to contact an adjacent article oe edge to the frames. Because the pliable materials are flexible and are not vacuum shrunk around or otherwise tightly wrapped around the article, the shocks, shipping and handling loads (up to the frictional limit just described) are elastically distributed along the contacting surface o~ the frac3ile. If the sheets of pliable material are transparent, inspections of the artlcle are simplified, and aesthetic appeal to the customer can be maintained.
In another embodiment, the frames and stretched 1() pliable membranes are combined with covers to form a single piece shipper.
In still another embodiment a packing spacer is formed supporting an object within its shippin(3 container in a friction and floating arrangement that absorbs flexion and torsion of the container.
The spacer is a box-like structure with at least one open face covered with a flexible membrane.
The object rests against the membrane. The contour of the other faces of the structure are shaped and dimensioned to match the internal geometry of the container. Typically the box-like structure is a wedge that fits in one corner of the container.
Four such wedges are used to support the object.
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~rief Descriptlon of Drawings Figure 1 shows an exploded perspective view of a sheet packing of a glass goblet within a box container;
Figure 2 shows a side cross sectional view of the sheet packing suspending the glass goblet article;
Figure 3 shows a perspective view of an alternate configuration mailer about to suspend a breakable wall plaque;
Figure 4 shows a sheet packing suspending multiple small items;
Figure S sho~ls a shipping container with multiple sheet packings;
Figure 6 shows a packing corner form prior to assembly;
Figure 7 shows an assembled packing corner form;
- Figure 8 shows an assembled packing corner forms installed within a package;
Flgure 9 shows an exploded view of multiple article packing;
Figure 10 shows a perspective view of a membrane packing for exceptionally heavy articles;
2~ .
Eigure 11 shows a cross sectional view taken along llne 11-11 of ~igure 10;
Eigure 12 shows a perspective view of a boot;
~ Eigure 13 shows an exploded view of au S alternate multl-artlcle packing;
Eigure 14 shows a front view of the alternate multi-article packing;
Eigure 15 shows a perspective view of assem~led floatlny packing inserts;
1() Eigure 16 shows a perspective view of a corner insert;
Eigu~e 17 shows a pers~ectlve view of a side insert; and Figure 18 shows arl alternate corner insert.
Best Mode of Carr~lng Out tbe Inventlon Figure 1 shows an exploded perspective view of a sheet packing of a glass goblet within a box container. The rigld or semi-riyid shipping box 2 can be made from cardboard, plastic oe otller appropriate materials, providing the structural integrity to wlthstand the shippillg and handlirlg loads. A first frame 3 fits within tlle slllpping -15- 1 33748~
container or box 2, resting the first frame's rear face 4 against the rear face 5 of box 2. The first frame 3 may be made from a flat panel, blank or - strip of cardboard or other rigid or semi-rigid material, but does not have to be continuous. The frame can be composed of four or more separate strips of rigid planar material or one diecut planar section having flaps which are foldably attached. A space or opening large enough to pass the article 6 is provided in frame 3. The frame mounts a first sheet of pliable material 7 which is transparènt in this embodiment, but could as well be opaque. The pliable film in this preferred embodiment is also self-adhesive, providing a means lS for attaching the separated panels or flaps together as well as securing the pliable film or membrane over the front face 8 of the frame. The - self-adhesive properties may be obtained by using the clinging properties of some types of film or membrane materials (e.g., vinyl), or applying a coating of tacky material and/or adhesive to the membrane or film.
The sheet 7 may be made from a resilient laminate, woven fabric, netting, vinyl, polyethylene or puncturable elastomeric film. A
-16- 1 33748q puncturable film would allow sharp protrusions of article 6 to puncture the film, but not fully tear the material under severe loads. The sheet of pliable and/or stretchable material 7 is attached over the front face 8 of first frame 3 around the edges. Attachment does not have to extend to all contacting portions of the pliable material to the frame. Attachment may be by means of glue or other adhesive or can rely on the pliable material's contact properties grabbing the edges of first frame 3. The article or solid object 6 being shipped in this embodiment is a fragile glass goblet. An alternate embodiment could have pliable sheet 7 cover only a portion of the front face 8.
A second frame 9 also provides an opening large enough to pass article 6, and is similar in shape and construction to the first frame 3. The peripheral flaps are folded and held in position by inserting into the box or external package 2. The depth 10 of second frame 9 can be altered by moving the folding lines of the frame flaps. When the flaps are not folded! the frame can be stored flat prior to use. The second frame depth 10 is selected to resiliently fill shipping box 2 in conjunction with the first frame 3 and the article -17- 1 3 37 48q 6, between rear face 5 and the four top face cover-flaps 11 of box 2, when the shipping box is closed.
A second pliable sheet 12 is stretched over the face of second frame 9 and attached to its periphery. When the second frame 9 is held against article 6 and first frame 3, the pliable materials deform around article 6 which is now located within the central openings of both frames. The pliable material is not shrunk or vacuum sealed against 1~ article 6, but the flexibility of sheets 7 and 12 spreads the contact area over a significant portion of article 6, and suspend the article by friction between the pliable sheets.
Figure 2 shows a side cross-sectional view of the sheet packing suspending the glass goblet article. The shipping box 2 encloses the packing and article; The shipping and handling loads are transferred from the the box 2 to the frames 3 and 9 which are lmmobilized in the box 2. The goblet 6 is suspended by friction between the pliable sheets 7 and 12 pressed against the article 6 by the frames 3 and 9 held in place by the rear face 5 and the front flaps 11 of box 2. The article 6 can translate between the pliable sheets 7 and 12 if loads in thls direction exceed the frictional -18- t 33748q force limits. Loads in this direction below the frictional limit and loads in other directions are absorbed by the pliable/flexible nature of the -- membrane, acting as a spring to absorb the shocks resulting from shipping and handling.
~igure 3 shows a perspective view of an alternate configuration mailer about to suspend a breakable wall plaque 14. The mailer first frame 13 has a first pliable material 7 stretched over one face and over an opening large enough to pass the shipping object 14. A mailer second frame lS
is similar in construction, having a second pliable sheet 12 stretched over the face and opening adjoining the first pliable material 7. Two mailer flaps 16 may be an integral part of the frame construction or may be attached to the mailer frames which are also bonded together by an - adhesive 22 to form a single piece construction mailer. The thlckness or depth of the mailer frames need not fully enclose the article 14 being shipped, as the flaps 16 can be formed to provide additional thickness and protection. The material of the mailer frames and flaps can be cardboaLd, foam core material or other treated paper product.
Additional protection can be provided by making the flap out of a crushable material.
Figure 4 shows a sheet packing capable of suspending multiple small items to be shipped. A
first frame 17 contains multiple openings which can pass the multiple articles, such as sensitive electronic chips, to be shipped (the articles not shown for clarity in this figure). The first sheet of pliable material 7 does not have to be shrinkable or stretched over one face of the first frame 17, but is attached to the first frame 17 without significant tensile forces stretching or otherwise applled to the pliable material. A second frame 18 is of similar construction, having a second sheet of pliable material 12 attached, but not stretched over a face of the second frame 18. With the frame 18 in a horizontal position, articles placed in the openings will tend to self center and stretching of the pliable material will suspend the center of the article below the plane of the frame. The two symmetrical frames can then be brought and held together in a face-to-face alignment which captures and immobilizes the articles sandwiched therebetween. The frames 17 and 18 normally would be attached, diecut and scored to fold together.
Figure 5 shows an alternate shipping container -~lith multiple sheet packings. If the articles are thinner than the walls of the frames, there is no need for the spacers or slots. If the article's size exceeds the frame thickness, the multiple shipping container 19 can be slotted on the inside to retain the several individual sheet packings 20.
The sheet packings are similar to the mailing frames shown in Figure 3, with or without the flap covers 16, enclosing small articles to be shipped 21, such as an electronic chip. Slots in the container 19 can hold frames of sheet packings against each other, or the ~rames may be adhesively attached to each other without the slots in container 19 to form the sheet packing prior to inserting into the multiple shipping container 19.
The devices and techniques described above can be adapted to accommodate a great variety of articles and container configurations. For example, the thickness or depth of the sheet-2n supporting frame, the spacing between frames and the contour of the frame can be infinitely varied.
The frame may be angular or arcuate, closed or open-ended and held together by the outer frames as il]ustrated in Figure 1, or by the spacer bracket or bonding material as described in connection with the embodiment of Figure 3.
Figure 6 is a planar structural packing member embodiment prior to assembly. A cardboard-like planar packing material 23 is composed of a central section 24 having a central opening 25 covered by a transparent film 26, and foldably attached triangular-shaped flaps 27, 28 and 29 extending from each of the triangular edges of the central section 24. The transparent film 26 covers the back portions (in this view) of the central section 24 and flaps 27, 28 and 29, and extends beyond the edges of one of the flaps 27. The transparent film in this embodiment has self-adhesive surface tension properties.
Figure 7 shows the planar cardboard-like packing member folded into a pyramidal corner form.
All three flaps (two of three not visible in this view) are folded towards each other and extended portions of the pliable membrane 26 self-adhere to adjoining section (flap 28 shown) and retain the adjoining sections into a three dimensional corner form. The central opening 25 continues to be covered by the film 26, and can support and protect a corner of an article (not shown for clarity) similar to the support and protection shown in -22- 1 33748~
Figures 1 and 2. -Figure 8 shows several assembled packing corner forms, made from a planar cardboard 23, within a package 30 (shown dotted for clarity).
The film 26 interfaces with a corner of the article being protected (not shown for clarity) and holds the three dimensional form of the previously planar cardboard section without any other means of attachment. A minimum of two co~ner forms could be used to protect the article or solid object at opposite corners, but a corner protection at more than two corners is the preferred embodiment. In this embodiment, the external package 30 provides the means for holding the corner form frames apart and against the object to be protected from the shipping and handling loads.
Figure 9 shows an exploded view of an alternate multiple article embodiment of the invention. Two separators 31 composed of two cross-linked planar cardboard segments are inserted within frames 32 and 36 and against their respective membranes 33. The separators are held in place by the walls of the packing container --(not shown). The width 34 of the separators is slightly greater than depth 35 of the frame, which t 33748q force~ the cross-linked separator 34 into membrane 33. The articles 37, glasses ln this embodiment, are positioned in line with the space between cross-linked members of the separators 31 between the first and second membranes 33. When the symmetrical frame and separator assembly are brought together, the glasses are grabbed by ttle membranes which are stretched forming a series of cocoon-like cells w~thin said spaces.
Figure 10 is a perspective view of a membeane packing of two exceptionally heavy (thick) panes of glass 38. The transparent membrane 39 is stretched across a folded cardboard insert 40. The folding outboard flaps (41, 42 and others not visible in lS this view) of the cardboard insert 40 are held in place by the attached membrane 39 to form a duct-like structure. The interior flaps 43 are folded against the exterior package (not shown for clarity) near the bottom center of the duct-like insert 40 structure. The interior flaps 43 serve as an additional weight carrying structure to carry the heavy glass panes 38. The pliable membrane 39 partially supports the glass panes 38 along the bottom 44, but the corners of the bottom (though the pliable membrane also rest against the interior flaps 43). A similar packlng duct-like structuee is applied to the top edges 45 of the glass articles 38. The interior flaps may or may not - support the article in this upper position, but allow the external container to be inverted without damage to the articles.
The other glass pane 38 is protected with a boot 46 covering the bottom 44 of the glass pane 38. The boot interfaces with the membrane 39, minimizing the possibility of sharp edges of the glass pane 38 puncturing the membrane 39. The boot helps distribute the weight of the glass pane 38.
The boot also changes the frictional resistance and potential for relative movement between the article being shipped 38 and the membrane 39 when shock and vibration forces are applied to the package/packing. If the article is to be nearly immobilized, a high static coefficient of friction can be achieved by adding a wrap interface to the boot 46 wlth a second membrane 99 to interface with the first membrane 39. With the boot, alternate interface wrap materials 49 can be selected to precisely adjust frictional resistance to limit the loads which may be applied prior to relative motion between the booted article 38 and the membrane 39.
Alternate boot configurations could also include cutouts to achieve different frictional resistances at different posltions (loads) or an alternate method o~ adjusting overall frictional resistance.
Cutouts could also provide relief to article protrusions at the interface.
Figure 11 is the cross-sectional view of the membrane support for the glass panes 38. Pliable membrane 39 is stretched across the central opening of both the upper and lower packing duct-like frames 40. Elaps 43 do not contact the membrane 39 on the upper packing, nor do they partially support the glass panes 38 at the upper edge 45. Only the membrane 39 supports the upper edge ~5 (see Figure 10) of the article 38. However, the weight of the glass panes 38 force the bottom edge 44 and membrane 39 into the internal flaps 43 of the lower packing. The internal flap~ 43 are supported by the remainder of the duct-like structure of the 2U packing and the external package (not shown for clarity, similar to the container shown in Figure 1). It should be noted that additional glass panes could be packaged between the two shown on the drawing.
26 t 33748q Figure 12 shows a shlpping boot 46. The boot ls composed of a card-like material 47 having a cutout 48. The cutout 48 is partially covered by .~ second membrane 49. The first membrane 39 (see Figure 10) mostly contacts the second membrane 49 at the interface, with the cutout 48 primarily provided for ease of assembly and ease of removal.
However, other cutout geometries can accommodate shipment of odd-shaped articles (see ~igure 10), and provide greater contact at the interface between the cardboard boot component 47 and the first membrane, or partial contact between the article to be shipped and the first membrane 39.
Resistance to movement of the article 38 (see Figure 10) being shipped would be dependent upon the frictional coefficients of friction of the first membrane 39 against the second membrane 49!
- the element 47, and the article 38. Further resistance to motion can be incorporated into the flaps 93.
Alternate boot configurations could incorporate multiple openings, similar to the opening 48 shown, at the first membrane interface.
Thus combinations of the frame 40, membranes 39, boots 46 and supporting flaps 43 can be varied to offer a wide range of protection for different types of articles.
Figure 13 shows an exploded view of an - alternate multi-articIe embodiment (articles being shipped not shown for clarity). A first frame packing 50 ~similar to frame 3) as shown in Figure 1) and membrane 51 is oppositely placed from second frame packing 52 and its membrane 51. A multi-article separator 53 is placed parallel to the opposing faces of the first and second frames 50 and 52. The separator 53 contains cutouts 5~
shaped to conform to the articles being shipped (see Figure 14). The multi-article separator positions articles held by the membranes 51 when the frames are biased towards each other by the external box 55 ends and flaps 56. The multi-article separator does not need to restraln the movement of articles under shock loads, but it may assist the membranes in holding the articles.
Figure 14 is a front view of an open package as shown in Figure 13. The flaps 56 are opened to expose the first frame 50 and the attached transparent membrane 51. The multi-ar~ticle separator 53 is visible through the transparent membrane 51, as are the cutouts 54 and the multiple glass articles being shipped S7. The cutouts 54 may snugly fit the articles 57 or may only loosely position the articles 57. The packaging, when opened presents an attractive display of the articles, as well as providing protection and being useable for other articles. A new multi-article separator having different cutouts is all that is needed to allow the packaging to ship several other articles or unusually shaped objects. In an alternate embodiment, the cutouts 59 in the multi-article separator are more generally shaped, only loosely positionlng (and separating) the articles being shipped. In this embodiment, the package may be used to ship other articles with no change in multi-article separator 53.
~igure lS shows the preferred embodiment of an assembled shock-absorbent packing insert assembly protecting a long flat fragile article 58. Typical articles of this type include glass panels, illuminated signs, art panels, and framed paintings. The long thin external package 59 encloses the article 58, and the package 59 (just prior to closing with flaps open) is shown in phantom for clarity. The external package S9 may he used for storage, display or other purposes -29- 1 33 7 4 8q where handling loads are foreseen. Eour corner spacers or inserts 60 are a box-like frame cardboard construction, having two outer ~aces 61 in intimate contact with the inner surface of the external container or package 59. The multi-faced frame 60 is hollow, but may also be fluid filled if fully enclosed. On a surface 62 not in intimate contact with the interior surfaces of the container 59, an opening or port 63 Is covered by a transparent membrane 64, such as a plastic film.
The film 64 is stretched over at least part of the opening 63 and attached to the box-like corner frame insert 60.
Attachment of the membrane 64 to the frame can be by means of a separate adhesive, an adhesive coated plastic membrane or the tactile/self adhesive properties of the membrane 64. The corner inserts 60 having the membrane 64 in contact with shipping object or fragile item 58 acts as both an anchor and a corner suspension of the item 58.
Sliding against the membrane allows the assembly to accept forces or shock loàds tending to distort the object 58. This limits forces on the article to those resulting from the membrane to article frictional coefficient and normal loads between the . ~
_30_ 1 337489 corner of the article 58 and membrane 64. Loads in excess of these limits result in translational or slidlng movement of the box-like corner insert 60 with respect to the object or article 58. As long as the translational motion does not bring the box-like insert 60 frame structure (one of the edges of the opening 63 most likelyj into contact with the article 58, torsional loads are limited. The frictional force limit can be controlled (selection of normal force and membrane material's coefficient of friction, or additional material between the membrane and the article) so that the maximum force is within safe limits (causing no distortion or breakage).
In the preferred embodiment, the interior inserts 65 are also provided for still further shock absorblng protection of the article 58. The interlor inserts again consist of a multi-faced frame, each having at least sides 66 in intimate contact with the interior surfaces 67 of the container 59. The interior inserts are placed to support the fragile article 58 when the package 59 is placed on one of its larger sides, placing one of the larger sides 68 parallel to the ground, or when shock loads from a direction perpendicular to -31- 1 33748~
side 6~ must be provided for.
The interior insert frame 69 also includes an opening 70, partially covered by a membrane 64. The membrane 64 is spread over the opening 70 and contacts the article 58. Lateral forces not perpendicular to the article face 68 are again limited by the frictional contact between ttle membrane 64 and article 58. Frictional forces again can be controlled to prevent excessive forces being applied to the article. Supporting forces, even when the insert is displaced in response to shock or other loads are still evenly distributed along the long fragile face 68 of the article 58.
Interior supports do not have to be directly opposing, but an opposing bias or other means must be provided to resist the forces normal to the longest face 68 generated by the anchored (in the package) interior insert 65 in contact with the object 58.
Figure 16 shows one of the corner inserts 60. Four of the outer surfaces 61 are in intimate contact with the package or container 59 (see Figure 15), which serves to anchor the insert in one corner of the package. The membrane 64 is spread over port or opening 63 on a surface 62 not in intimate contact with the shipping container 59 (see Figure 15). Two of the lower corner inserts may be placed in the shipping container 59 (see Figure 15), followed by the article 58 and the two upper corner inserts 60. The spacing of the ported face 62 from the corners of container 59 the dimension between corners of container 59, and the length of the edges of article face 68 (see Figure 15) determine the extent of penetration of article 58 corner into port 63 of ported face 62. In the configuration shown, the membrane 69 is self adhesive, and is used to cover the outer congruent surfaces (hidden in Figure 16) to hold and retain the box-like structure into the desirod corner shape.
Figure 17 shows an interior insert 65.
Three outer surfaces 66 of the interior insert 65 are in intimate contact with the inner surfaces 67 of the container 59 (see Figure 15) . Only one portion of the opening 70 is covered by the membrane 64, which is stretched over and attached to the portéd face as well as a portion of the outer faces 66. Extending of the membrane 64 to the outer faces 66, which is placed in intimate contact with the interior surfaces of the container ` _33_ 1 33 7 4 8 q 59 (see Figure 15) provides an additional structural (frictional forces and self adhesive membrane holding of box-like insert cardboard flaps ~~ in place).
Figure 18 shows an alternate shock absorbing package insert assembly. Alternate inserts 69 are similar to extended coener inserts 60 as shown in Figure 16. These alternate inserts 69 can be used to support one larger fragile article 70 within a larger outer container 71 (shown in phantom with flaps closed for clarity), or a series of smaller articles, similar in shape to the article 58 shown in Figure 15. The alternate insert 69 has outer faces in intimate contact with the container 71 and a larger ported face 72, over which the membrane 64 is spre~d and attached. The extended corner type Oe membrane 64 suspension of the larger article 70 (or multiple smaller artic.les) again allows the container to flex, twist, or otherwise deform without applying these excessive deforming loads to the article(s).
Normal supporting loads are again distributed along the edges of the article 70 to avoid stress concentrations within the article.
_34_ 1 3 3 7 48 q In the preferred embodiment, the materials of construction of the shock-absorbing spacer are a sturdy grade of cardboard for the box-like frame, - having foldable flaps to create the box like shape.
The membrane 64 is preferably made from an extruded PVC (polyvinyl chloride) film having a thickness between 2 and 10 mils. Other transparent thermoplastic films and surface finishes can also be selected if a different coefficient of friction is desired. The thickness can be varied for - various load carrying support and resilience properties. However, the extruded PVC membrane has been found to exhibit good frictional properties, superior resistance to puncturing or ripping loads and excellent memory, that is the membrane after being stretched returns quickly to its initial formation.
While the preferred and alternate embodiments of the invention have been shown and described, changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of this invention.
This encapsulated approach has also been used for external packaging, as well as packing within a shipping or handling package. A pre-formed rigid frame, container or package is used to anchor the encapsulated article. The container and article withstand the full shipping and handling loads.
Examples include blister packs and rolled drawirlg containers. These rigid or semi-rigid containers can also be attached to a card to provide a means for rack or hook display. In a modification of this approach, the rigid container is also transparent allowing the customer to fully view the article.
In a further modification, package is not preformed, but is shrunk fit or formed around the article while the packaging material is flexible (for example using vacuum to draw a thermosetting plastic film around the article), then setting -6- ~ 33748~
(e.g., thermo-setting material) the previously flexible material to form a rigid container. This approach immobilizes the article and completely encapsulates it.
In still another approach, the membranes encapsulating the article are also used to form a pillow type of support, as previo~sly described. At least one of the membranes is extended to enclose a volume or sealed to another air tight structure to enclose a volume and form an inflatable pillow-like chamber. The pillow may be air tight, or orificed to act as a fluid damped shock absorbing mechanism.
An Example of an encapsulated and pillow like support is shown in United States Patent Number 4,491,225.
STRUCTURAL MATERIALS AND EORMS
Nearly all of the interface packing materials, especially sheet type of packing approaches, require rigid support. Support may be by direct attachment to the external package, but is commonly an internal separator or rigid packing insert.
Planar reinforcing structural material are common. A typical internal separator or insert 5 composed of folded or cross-locking cardboard 7_ 1 33748~
sheets. ~olds or cross-locking provide structural integrity in several directions. Eolds or cross-locking orientation must be retained in position in order to obtain this structural integrity.
Interface material support frames are provided in a variety of situations. Interface materials may be attached or blocked by packing support frames.
Corner structural packing forms are also common. Corner forms center and protect the article, especially i~ the external package is insufficient to protect the article from shocks and loads emanating from the corner (e. g., dropping package on corner). These corner packings may be made from cross-braced cardboard-like material or solid inserts placed at the corners.
All the above described approaches rely UpOIl one or more of the following techniques:
1) the article is encapsulated or otherwise attached to a rigid, structural packing or package member by means of a deformable interface packing member, and/or 2) the a~ticle is unattached, but suspended or cushioned by loosely fitting wrap, inflated, filled or crushable interface packing materials, or -8- I 33748q 3) the aeticle is attached and supported by rigid, but deformable or crushable packing or package material.
~- Special problems occur when shock and shipmerlt protection of a large flat and fragile object, such as framed lithogeaphic prints and glass art panels, is desired. The container for these large flat objects is also typically a larger flat container.
If the container is dropped and one corner hits the ground first, the impact force is translnitted to only a corner of the fragile object, possibly twisting or breaking it. Common packirlg inserts (foam, pillows, etc.) may reduce and distribute the impact force, but all of the peior aet transmit the shock force without limits. These torslonal loads of large flat objects, further compounds problems and the chance of breakage.
- Another problem with protecting long flat objects is flexion. When a long glass panel is 2~ supported only along one or more edges, the object weight and shipping loads tends cause flexlon of the object, such as a glass panel. Additional packing lnserts may be required to support the glass at multiple interior points.
Dlsclosure of Invention The principal and secondary objects of the invention are:
to provide a packing which suspends a fragile article in a frame without attachment to or encapsulation of the article;
to provide a packing which provides an elastic, floating support, but strictly limit the unacceptable shipping and handling loads transmitted to the fragile article in specific directions to a specific upper limit;
to provide a packing which does not always require pre-formed and separate rigid material separators or inserts within the container;
to provide protection from dust and other contaminants;
-to provide a packing which provides a stand off within the package, but can be stored flat;
to provide a packing which allows the articlé to be visually inspected without disassembly;
to provide a packing which reduces f ill ing times; and .
to provide a low cost/weight packing which does not require special post-packing treatment.
-~ These and other objects are achieved by frictional contact sandwichlng the article between two pliable and flexible membranes, which are each attached to a separate supporting frame. The frames have a central opening over which the pliable material is attached. Attachment of the pliable material may also be used to secure loose folds, flaps, and separators to the frame, creating a rigid structural packing form. The frames are normally separated, but may be attached to each other or may be biased towards each other by initially loose fitting inserts or flaps to maintain a high friction contact between the pliable membranes and the article to be shipped.
- The friction contact limits handling and shipping shock loads that can be transmitted to the protected item.
Multiple items and loose fitting separators may also be frictionally held between the pliable materials as long as space is available within the frame opening. The technlque does not require attachment of the article or spacers since the 1 33748q pression of two pliable membranes against the article and separators is sufficient to immobilize ., it against forces up to a frictional limit. The pliable membrane may even be punctured (accidentally or otherwise) by sharp points on the article without compromising structural integrity and further limiting loads on the sharp protrusion.
Even if not punctured, sharp points on the article cause the membrane to deform at these points, which further distributes the shipping and handling loads. The fragile protruding article may also be protected against dust and other contaminants by the pliable membranes, even if punctured as the membrane remains tight around the protrusion.
lS Exceptionally heavy articles may be partially supported by the pliable membrane frictional - contact.
Large transient drop and/or shock loads to the fragile article ar limited by the trampoline like action of the membrane in one dieection and friction resistance/deformation and ultimate movement of the article between the membranes in other directions, at least until the article moves to contact an adjacent article oe edge to the frames. Because the pliable materials are flexible and are not vacuum shrunk around or otherwise tightly wrapped around the article, the shocks, shipping and handling loads (up to the frictional limit just described) are elastically distributed along the contacting surface o~ the frac3ile. If the sheets of pliable material are transparent, inspections of the artlcle are simplified, and aesthetic appeal to the customer can be maintained.
In another embodiment, the frames and stretched 1() pliable membranes are combined with covers to form a single piece shipper.
In still another embodiment a packing spacer is formed supporting an object within its shippin(3 container in a friction and floating arrangement that absorbs flexion and torsion of the container.
The spacer is a box-like structure with at least one open face covered with a flexible membrane.
The object rests against the membrane. The contour of the other faces of the structure are shaped and dimensioned to match the internal geometry of the container. Typically the box-like structure is a wedge that fits in one corner of the container.
Four such wedges are used to support the object.
- 1 1 33748~
~rief Descriptlon of Drawings Figure 1 shows an exploded perspective view of a sheet packing of a glass goblet within a box container;
Figure 2 shows a side cross sectional view of the sheet packing suspending the glass goblet article;
Figure 3 shows a perspective view of an alternate configuration mailer about to suspend a breakable wall plaque;
Figure 4 shows a sheet packing suspending multiple small items;
Figure S sho~ls a shipping container with multiple sheet packings;
Figure 6 shows a packing corner form prior to assembly;
Figure 7 shows an assembled packing corner form;
- Figure 8 shows an assembled packing corner forms installed within a package;
Flgure 9 shows an exploded view of multiple article packing;
Figure 10 shows a perspective view of a membrane packing for exceptionally heavy articles;
2~ .
Eigure 11 shows a cross sectional view taken along llne 11-11 of ~igure 10;
Eigure 12 shows a perspective view of a boot;
~ Eigure 13 shows an exploded view of au S alternate multl-artlcle packing;
Eigure 14 shows a front view of the alternate multi-article packing;
Eigure 15 shows a perspective view of assem~led floatlny packing inserts;
1() Eigure 16 shows a perspective view of a corner insert;
Eigu~e 17 shows a pers~ectlve view of a side insert; and Figure 18 shows arl alternate corner insert.
Best Mode of Carr~lng Out tbe Inventlon Figure 1 shows an exploded perspective view of a sheet packing of a glass goblet within a box container. The rigld or semi-riyid shipping box 2 can be made from cardboard, plastic oe otller appropriate materials, providing the structural integrity to wlthstand the shippillg and handlirlg loads. A first frame 3 fits within tlle slllpping -15- 1 33748~
container or box 2, resting the first frame's rear face 4 against the rear face 5 of box 2. The first frame 3 may be made from a flat panel, blank or - strip of cardboard or other rigid or semi-rigid material, but does not have to be continuous. The frame can be composed of four or more separate strips of rigid planar material or one diecut planar section having flaps which are foldably attached. A space or opening large enough to pass the article 6 is provided in frame 3. The frame mounts a first sheet of pliable material 7 which is transparènt in this embodiment, but could as well be opaque. The pliable film in this preferred embodiment is also self-adhesive, providing a means lS for attaching the separated panels or flaps together as well as securing the pliable film or membrane over the front face 8 of the frame. The - self-adhesive properties may be obtained by using the clinging properties of some types of film or membrane materials (e.g., vinyl), or applying a coating of tacky material and/or adhesive to the membrane or film.
The sheet 7 may be made from a resilient laminate, woven fabric, netting, vinyl, polyethylene or puncturable elastomeric film. A
-16- 1 33748q puncturable film would allow sharp protrusions of article 6 to puncture the film, but not fully tear the material under severe loads. The sheet of pliable and/or stretchable material 7 is attached over the front face 8 of first frame 3 around the edges. Attachment does not have to extend to all contacting portions of the pliable material to the frame. Attachment may be by means of glue or other adhesive or can rely on the pliable material's contact properties grabbing the edges of first frame 3. The article or solid object 6 being shipped in this embodiment is a fragile glass goblet. An alternate embodiment could have pliable sheet 7 cover only a portion of the front face 8.
A second frame 9 also provides an opening large enough to pass article 6, and is similar in shape and construction to the first frame 3. The peripheral flaps are folded and held in position by inserting into the box or external package 2. The depth 10 of second frame 9 can be altered by moving the folding lines of the frame flaps. When the flaps are not folded! the frame can be stored flat prior to use. The second frame depth 10 is selected to resiliently fill shipping box 2 in conjunction with the first frame 3 and the article -17- 1 3 37 48q 6, between rear face 5 and the four top face cover-flaps 11 of box 2, when the shipping box is closed.
A second pliable sheet 12 is stretched over the face of second frame 9 and attached to its periphery. When the second frame 9 is held against article 6 and first frame 3, the pliable materials deform around article 6 which is now located within the central openings of both frames. The pliable material is not shrunk or vacuum sealed against 1~ article 6, but the flexibility of sheets 7 and 12 spreads the contact area over a significant portion of article 6, and suspend the article by friction between the pliable sheets.
Figure 2 shows a side cross-sectional view of the sheet packing suspending the glass goblet article. The shipping box 2 encloses the packing and article; The shipping and handling loads are transferred from the the box 2 to the frames 3 and 9 which are lmmobilized in the box 2. The goblet 6 is suspended by friction between the pliable sheets 7 and 12 pressed against the article 6 by the frames 3 and 9 held in place by the rear face 5 and the front flaps 11 of box 2. The article 6 can translate between the pliable sheets 7 and 12 if loads in thls direction exceed the frictional -18- t 33748q force limits. Loads in this direction below the frictional limit and loads in other directions are absorbed by the pliable/flexible nature of the -- membrane, acting as a spring to absorb the shocks resulting from shipping and handling.
~igure 3 shows a perspective view of an alternate configuration mailer about to suspend a breakable wall plaque 14. The mailer first frame 13 has a first pliable material 7 stretched over one face and over an opening large enough to pass the shipping object 14. A mailer second frame lS
is similar in construction, having a second pliable sheet 12 stretched over the face and opening adjoining the first pliable material 7. Two mailer flaps 16 may be an integral part of the frame construction or may be attached to the mailer frames which are also bonded together by an - adhesive 22 to form a single piece construction mailer. The thlckness or depth of the mailer frames need not fully enclose the article 14 being shipped, as the flaps 16 can be formed to provide additional thickness and protection. The material of the mailer frames and flaps can be cardboaLd, foam core material or other treated paper product.
Additional protection can be provided by making the flap out of a crushable material.
Figure 4 shows a sheet packing capable of suspending multiple small items to be shipped. A
first frame 17 contains multiple openings which can pass the multiple articles, such as sensitive electronic chips, to be shipped (the articles not shown for clarity in this figure). The first sheet of pliable material 7 does not have to be shrinkable or stretched over one face of the first frame 17, but is attached to the first frame 17 without significant tensile forces stretching or otherwise applled to the pliable material. A second frame 18 is of similar construction, having a second sheet of pliable material 12 attached, but not stretched over a face of the second frame 18. With the frame 18 in a horizontal position, articles placed in the openings will tend to self center and stretching of the pliable material will suspend the center of the article below the plane of the frame. The two symmetrical frames can then be brought and held together in a face-to-face alignment which captures and immobilizes the articles sandwiched therebetween. The frames 17 and 18 normally would be attached, diecut and scored to fold together.
Figure 5 shows an alternate shipping container -~lith multiple sheet packings. If the articles are thinner than the walls of the frames, there is no need for the spacers or slots. If the article's size exceeds the frame thickness, the multiple shipping container 19 can be slotted on the inside to retain the several individual sheet packings 20.
The sheet packings are similar to the mailing frames shown in Figure 3, with or without the flap covers 16, enclosing small articles to be shipped 21, such as an electronic chip. Slots in the container 19 can hold frames of sheet packings against each other, or the ~rames may be adhesively attached to each other without the slots in container 19 to form the sheet packing prior to inserting into the multiple shipping container 19.
The devices and techniques described above can be adapted to accommodate a great variety of articles and container configurations. For example, the thickness or depth of the sheet-2n supporting frame, the spacing between frames and the contour of the frame can be infinitely varied.
The frame may be angular or arcuate, closed or open-ended and held together by the outer frames as il]ustrated in Figure 1, or by the spacer bracket or bonding material as described in connection with the embodiment of Figure 3.
Figure 6 is a planar structural packing member embodiment prior to assembly. A cardboard-like planar packing material 23 is composed of a central section 24 having a central opening 25 covered by a transparent film 26, and foldably attached triangular-shaped flaps 27, 28 and 29 extending from each of the triangular edges of the central section 24. The transparent film 26 covers the back portions (in this view) of the central section 24 and flaps 27, 28 and 29, and extends beyond the edges of one of the flaps 27. The transparent film in this embodiment has self-adhesive surface tension properties.
Figure 7 shows the planar cardboard-like packing member folded into a pyramidal corner form.
All three flaps (two of three not visible in this view) are folded towards each other and extended portions of the pliable membrane 26 self-adhere to adjoining section (flap 28 shown) and retain the adjoining sections into a three dimensional corner form. The central opening 25 continues to be covered by the film 26, and can support and protect a corner of an article (not shown for clarity) similar to the support and protection shown in -22- 1 33748~
Figures 1 and 2. -Figure 8 shows several assembled packing corner forms, made from a planar cardboard 23, within a package 30 (shown dotted for clarity).
The film 26 interfaces with a corner of the article being protected (not shown for clarity) and holds the three dimensional form of the previously planar cardboard section without any other means of attachment. A minimum of two co~ner forms could be used to protect the article or solid object at opposite corners, but a corner protection at more than two corners is the preferred embodiment. In this embodiment, the external package 30 provides the means for holding the corner form frames apart and against the object to be protected from the shipping and handling loads.
Figure 9 shows an exploded view of an alternate multiple article embodiment of the invention. Two separators 31 composed of two cross-linked planar cardboard segments are inserted within frames 32 and 36 and against their respective membranes 33. The separators are held in place by the walls of the packing container --(not shown). The width 34 of the separators is slightly greater than depth 35 of the frame, which t 33748q force~ the cross-linked separator 34 into membrane 33. The articles 37, glasses ln this embodiment, are positioned in line with the space between cross-linked members of the separators 31 between the first and second membranes 33. When the symmetrical frame and separator assembly are brought together, the glasses are grabbed by ttle membranes which are stretched forming a series of cocoon-like cells w~thin said spaces.
Figure 10 is a perspective view of a membeane packing of two exceptionally heavy (thick) panes of glass 38. The transparent membrane 39 is stretched across a folded cardboard insert 40. The folding outboard flaps (41, 42 and others not visible in lS this view) of the cardboard insert 40 are held in place by the attached membrane 39 to form a duct-like structure. The interior flaps 43 are folded against the exterior package (not shown for clarity) near the bottom center of the duct-like insert 40 structure. The interior flaps 43 serve as an additional weight carrying structure to carry the heavy glass panes 38. The pliable membrane 39 partially supports the glass panes 38 along the bottom 44, but the corners of the bottom (though the pliable membrane also rest against the interior flaps 43). A similar packlng duct-like structuee is applied to the top edges 45 of the glass articles 38. The interior flaps may or may not - support the article in this upper position, but allow the external container to be inverted without damage to the articles.
The other glass pane 38 is protected with a boot 46 covering the bottom 44 of the glass pane 38. The boot interfaces with the membrane 39, minimizing the possibility of sharp edges of the glass pane 38 puncturing the membrane 39. The boot helps distribute the weight of the glass pane 38.
The boot also changes the frictional resistance and potential for relative movement between the article being shipped 38 and the membrane 39 when shock and vibration forces are applied to the package/packing. If the article is to be nearly immobilized, a high static coefficient of friction can be achieved by adding a wrap interface to the boot 46 wlth a second membrane 99 to interface with the first membrane 39. With the boot, alternate interface wrap materials 49 can be selected to precisely adjust frictional resistance to limit the loads which may be applied prior to relative motion between the booted article 38 and the membrane 39.
Alternate boot configurations could also include cutouts to achieve different frictional resistances at different posltions (loads) or an alternate method o~ adjusting overall frictional resistance.
Cutouts could also provide relief to article protrusions at the interface.
Figure 11 is the cross-sectional view of the membrane support for the glass panes 38. Pliable membrane 39 is stretched across the central opening of both the upper and lower packing duct-like frames 40. Elaps 43 do not contact the membrane 39 on the upper packing, nor do they partially support the glass panes 38 at the upper edge 45. Only the membrane 39 supports the upper edge ~5 (see Figure 10) of the article 38. However, the weight of the glass panes 38 force the bottom edge 44 and membrane 39 into the internal flaps 43 of the lower packing. The internal flap~ 43 are supported by the remainder of the duct-like structure of the 2U packing and the external package (not shown for clarity, similar to the container shown in Figure 1). It should be noted that additional glass panes could be packaged between the two shown on the drawing.
26 t 33748q Figure 12 shows a shlpping boot 46. The boot ls composed of a card-like material 47 having a cutout 48. The cutout 48 is partially covered by .~ second membrane 49. The first membrane 39 (see Figure 10) mostly contacts the second membrane 49 at the interface, with the cutout 48 primarily provided for ease of assembly and ease of removal.
However, other cutout geometries can accommodate shipment of odd-shaped articles (see ~igure 10), and provide greater contact at the interface between the cardboard boot component 47 and the first membrane, or partial contact between the article to be shipped and the first membrane 39.
Resistance to movement of the article 38 (see Figure 10) being shipped would be dependent upon the frictional coefficients of friction of the first membrane 39 against the second membrane 49!
- the element 47, and the article 38. Further resistance to motion can be incorporated into the flaps 93.
Alternate boot configurations could incorporate multiple openings, similar to the opening 48 shown, at the first membrane interface.
Thus combinations of the frame 40, membranes 39, boots 46 and supporting flaps 43 can be varied to offer a wide range of protection for different types of articles.
Figure 13 shows an exploded view of an - alternate multi-articIe embodiment (articles being shipped not shown for clarity). A first frame packing 50 ~similar to frame 3) as shown in Figure 1) and membrane 51 is oppositely placed from second frame packing 52 and its membrane 51. A multi-article separator 53 is placed parallel to the opposing faces of the first and second frames 50 and 52. The separator 53 contains cutouts 5~
shaped to conform to the articles being shipped (see Figure 14). The multi-article separator positions articles held by the membranes 51 when the frames are biased towards each other by the external box 55 ends and flaps 56. The multi-article separator does not need to restraln the movement of articles under shock loads, but it may assist the membranes in holding the articles.
Figure 14 is a front view of an open package as shown in Figure 13. The flaps 56 are opened to expose the first frame 50 and the attached transparent membrane 51. The multi-ar~ticle separator 53 is visible through the transparent membrane 51, as are the cutouts 54 and the multiple glass articles being shipped S7. The cutouts 54 may snugly fit the articles 57 or may only loosely position the articles 57. The packaging, when opened presents an attractive display of the articles, as well as providing protection and being useable for other articles. A new multi-article separator having different cutouts is all that is needed to allow the packaging to ship several other articles or unusually shaped objects. In an alternate embodiment, the cutouts 59 in the multi-article separator are more generally shaped, only loosely positionlng (and separating) the articles being shipped. In this embodiment, the package may be used to ship other articles with no change in multi-article separator 53.
~igure lS shows the preferred embodiment of an assembled shock-absorbent packing insert assembly protecting a long flat fragile article 58. Typical articles of this type include glass panels, illuminated signs, art panels, and framed paintings. The long thin external package 59 encloses the article 58, and the package 59 (just prior to closing with flaps open) is shown in phantom for clarity. The external package S9 may he used for storage, display or other purposes -29- 1 33 7 4 8q where handling loads are foreseen. Eour corner spacers or inserts 60 are a box-like frame cardboard construction, having two outer ~aces 61 in intimate contact with the inner surface of the external container or package 59. The multi-faced frame 60 is hollow, but may also be fluid filled if fully enclosed. On a surface 62 not in intimate contact with the interior surfaces of the container 59, an opening or port 63 Is covered by a transparent membrane 64, such as a plastic film.
The film 64 is stretched over at least part of the opening 63 and attached to the box-like corner frame insert 60.
Attachment of the membrane 64 to the frame can be by means of a separate adhesive, an adhesive coated plastic membrane or the tactile/self adhesive properties of the membrane 64. The corner inserts 60 having the membrane 64 in contact with shipping object or fragile item 58 acts as both an anchor and a corner suspension of the item 58.
Sliding against the membrane allows the assembly to accept forces or shock loàds tending to distort the object 58. This limits forces on the article to those resulting from the membrane to article frictional coefficient and normal loads between the . ~
_30_ 1 337489 corner of the article 58 and membrane 64. Loads in excess of these limits result in translational or slidlng movement of the box-like corner insert 60 with respect to the object or article 58. As long as the translational motion does not bring the box-like insert 60 frame structure (one of the edges of the opening 63 most likelyj into contact with the article 58, torsional loads are limited. The frictional force limit can be controlled (selection of normal force and membrane material's coefficient of friction, or additional material between the membrane and the article) so that the maximum force is within safe limits (causing no distortion or breakage).
In the preferred embodiment, the interior inserts 65 are also provided for still further shock absorblng protection of the article 58. The interlor inserts again consist of a multi-faced frame, each having at least sides 66 in intimate contact with the interior surfaces 67 of the container 59. The interior inserts are placed to support the fragile article 58 when the package 59 is placed on one of its larger sides, placing one of the larger sides 68 parallel to the ground, or when shock loads from a direction perpendicular to -31- 1 33748~
side 6~ must be provided for.
The interior insert frame 69 also includes an opening 70, partially covered by a membrane 64. The membrane 64 is spread over the opening 70 and contacts the article 58. Lateral forces not perpendicular to the article face 68 are again limited by the frictional contact between ttle membrane 64 and article 58. Frictional forces again can be controlled to prevent excessive forces being applied to the article. Supporting forces, even when the insert is displaced in response to shock or other loads are still evenly distributed along the long fragile face 68 of the article 58.
Interior supports do not have to be directly opposing, but an opposing bias or other means must be provided to resist the forces normal to the longest face 68 generated by the anchored (in the package) interior insert 65 in contact with the object 58.
Figure 16 shows one of the corner inserts 60. Four of the outer surfaces 61 are in intimate contact with the package or container 59 (see Figure 15), which serves to anchor the insert in one corner of the package. The membrane 64 is spread over port or opening 63 on a surface 62 not in intimate contact with the shipping container 59 (see Figure 15). Two of the lower corner inserts may be placed in the shipping container 59 (see Figure 15), followed by the article 58 and the two upper corner inserts 60. The spacing of the ported face 62 from the corners of container 59 the dimension between corners of container 59, and the length of the edges of article face 68 (see Figure 15) determine the extent of penetration of article 58 corner into port 63 of ported face 62. In the configuration shown, the membrane 69 is self adhesive, and is used to cover the outer congruent surfaces (hidden in Figure 16) to hold and retain the box-like structure into the desirod corner shape.
Figure 17 shows an interior insert 65.
Three outer surfaces 66 of the interior insert 65 are in intimate contact with the inner surfaces 67 of the container 59 (see Figure 15) . Only one portion of the opening 70 is covered by the membrane 64, which is stretched over and attached to the portéd face as well as a portion of the outer faces 66. Extending of the membrane 64 to the outer faces 66, which is placed in intimate contact with the interior surfaces of the container ` _33_ 1 33 7 4 8 q 59 (see Figure 15) provides an additional structural (frictional forces and self adhesive membrane holding of box-like insert cardboard flaps ~~ in place).
Figure 18 shows an alternate shock absorbing package insert assembly. Alternate inserts 69 are similar to extended coener inserts 60 as shown in Figure 16. These alternate inserts 69 can be used to support one larger fragile article 70 within a larger outer container 71 (shown in phantom with flaps closed for clarity), or a series of smaller articles, similar in shape to the article 58 shown in Figure 15. The alternate insert 69 has outer faces in intimate contact with the container 71 and a larger ported face 72, over which the membrane 64 is spre~d and attached. The extended corner type Oe membrane 64 suspension of the larger article 70 (or multiple smaller artic.les) again allows the container to flex, twist, or otherwise deform without applying these excessive deforming loads to the article(s).
Normal supporting loads are again distributed along the edges of the article 70 to avoid stress concentrations within the article.
_34_ 1 3 3 7 48 q In the preferred embodiment, the materials of construction of the shock-absorbing spacer are a sturdy grade of cardboard for the box-like frame, - having foldable flaps to create the box like shape.
The membrane 64 is preferably made from an extruded PVC (polyvinyl chloride) film having a thickness between 2 and 10 mils. Other transparent thermoplastic films and surface finishes can also be selected if a different coefficient of friction is desired. The thickness can be varied for - various load carrying support and resilience properties. However, the extruded PVC membrane has been found to exhibit good frictional properties, superior resistance to puncturing or ripping loads and excellent memory, that is the membrane after being stretched returns quickly to its initial formation.
While the preferred and alternate embodiments of the invention have been shown and described, changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of this invention.
Claims (8)
1. A package comprising the combination of:
a container that defines inner surfaces; and a shock absorbing spacer inside said container for cushioning an object placed in said container;
said spacer further comprising a frame with a plurality of outer faces, and having an opening on at least one of its faces;
a membrane spread over said opening and secured to said frame by securing means;
at least two of said outer faces of said frame having a common edge; and said frame being shaped and dimensioned to nest within one corner formed by said inner surfaces of said container to thereby place a portion of said frame in contact with an object in said container when said at least two outer faces are in contact with said one corner of said container.
a container that defines inner surfaces; and a shock absorbing spacer inside said container for cushioning an object placed in said container;
said spacer further comprising a frame with a plurality of outer faces, and having an opening on at least one of its faces;
a membrane spread over said opening and secured to said frame by securing means;
at least two of said outer faces of said frame having a common edge; and said frame being shaped and dimensioned to nest within one corner formed by said inner surfaces of said container to thereby place a portion of said frame in contact with an object in said container when said at least two outer faces are in contact with said one corner of said container.
2. A package comprising the combination of:
a container that defines inner surfaces; and a shock absorbing spacer inside said container for cushioning an object placed in said container;
said spacer further comprising a frame with a plurality of outer faces, said frame comprising an elongated box having an opening extending over most of the entire length of one of the longest sides, and partially over the length of at least one of the adjacent long sides;
the side opposite said longest side and two shorter sides at either end of said longest side being in contact with said inner surface of said container; and a membrane spread over said opening and secured to said frame by securing means.
a container that defines inner surfaces; and a shock absorbing spacer inside said container for cushioning an object placed in said container;
said spacer further comprising a frame with a plurality of outer faces, said frame comprising an elongated box having an opening extending over most of the entire length of one of the longest sides, and partially over the length of at least one of the adjacent long sides;
the side opposite said longest side and two shorter sides at either end of said longest side being in contact with said inner surface of said container; and a membrane spread over said opening and secured to said frame by securing means.
3. The spacer of either of claims 1 or 2, wherein said frame is composed of panels of cardboard-like material, held together by said means for securing.
4. The spacer of either of claims 1 or 2, wherein said membrane and means for securing consists of a self adhesive plastic film.
5. The spacer of either of claims 1 or 2, wherein said membrane is composed of an extruded PVC film having a thickness ranging from 2 to 12 mils.
6. The spacer of either of claims 1 or 2, wherein the dimensions and properties of said membrane, said container dimensions and said object are selected to limit the force in a specific direction which can be transmitted by said spacer to said object.
7. The spacer of claim 6, wherein said membrane is in slidable contact with said object when a force exceeding said force limit is applied to said spacer.
8. The spacer of either of claims 1 or 2, wherein a plurality of said objects are in intimate contact with said membrane.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US285,449 | 1988-12-16 | ||
| US07/285,449 US4923065A (en) | 1988-02-29 | 1988-12-16 | Membrane packing and retainer |
| US29305989A | 1989-01-03 | 1989-01-03 | |
| US293,059 | 1989-01-03 | ||
| CA 599694 CA1328854C (en) | 1988-12-16 | 1989-05-12 | Membrane packing |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 599694 Division CA1328854C (en) | 1988-12-16 | 1989-05-12 | Membrane packing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1337489C true CA1337489C (en) | 1995-10-31 |
Family
ID=27168312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616799A Expired - Fee Related CA1337489C (en) | 1988-12-16 | 1994-01-13 | Membrane packing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1337489C (en) |
-
1994
- 1994-01-13 CA CA000616799A patent/CA1337489C/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |