Expandable multicelled cushioning structure

• US 4,005,236 A
• Filed: 02/28/1975
• Issued: 01/25/1977
• Est. Priority Date: 05/16/1973
• Status: Expired due to Term

• Current Assignee: Robert H. Graebe
• Original Assignee: Robert H. Graebe
• Inventors: Graebe, Robert H.
• Primary Examiner(s): Dier, Philip
• Application Number:
  US05/554,117
• Time in Patent Office: 697 Days
• Field of Search: 425/269, 425/275, 5/348 R, 5/345 R, 5/368-369, 5/350, 428/178, 428/72
• US Class Current: 428/72
• CPC Class Codes: A47C 27/081 of pneumatic type
• CPC Class Codes: B29C 33/00 Moulds or cores; Details thereof or accessories therefor
• CPC Class Codes: B29C 41/14 Dipping a core B29C41/10 takes precedence
• CPC Class Codes: B29D 22/02 Inflatable articles
• CPC Class Codes: Y10T 428/234 including elements cooperating to form cells
• CPC Class Codes: Y10T 428/24661 Forming, or cooperating to form cells

Abstract

A multicelled structure which may be used as a body support or other cushioning device has inflatable cells against which a supported or cushioned body bears. The structure is formed from a flexible material on mandrels which have a fluted or other shaped configuration and spaced apart. This prevents the material which is in a soft or uncured condition from bridging adjacent cells during the forming operation. The fluting or shape on the resulting cells is configured to enable the side walls of adjacent cells to closely approach or contact each other when the cells are expanded by internal fluid pressure so that the end walls of the cells form a generally continuous surface.

Claims

1. A cushion device comprising:

a base formed from a fluid impervious material and having at least one cavity therein which is isolated from the surrounding atmosphere and is capable of retaining a fluid under pressure; and

a plurality of cells connected to the base and formed from a fluid impervious material which is flexible, the cells having hollow interiors which are isolated from the surrounding atmosphere and open into the cavity of the base such that the interiors of all of the cells communicate through the cavity of the base, the cells having side walls with the sidewalls of adjacent cells being located opposite each other, the cells when deflated being generally spaced apart and having flutes along their side walls, the flutes of each cell being generally parallel and arranged around the entire cell and further extending away from the base, the cells being sufficiently flexible that when pressurized they will expand laterally such that the flutes are generally obliterated and the side walls of adjacent cells are in contact for substantial portions of their lengths so as to interfere with each other, the cells when pressurized further being such that the ends of the cells form a generally continuous outwardly presented surface which conforms to the shapes of objects brought against it.

2. A cushion device according to claim 1 wherein the adjacent cells are in substantial contact and deform each other when the cells are inflated and pressurized.

3. A device according to claim 1 wherein the cavity in the base comprises a plurality of raised channels interconnecting the hollow interiors of adjacent cells.

4. A device according to claim 1 wherein the base comprises an intervening layer to which the cells are attached and a sealing layer underlying the intervening layer and being sealed thereto;

and wherein the layers are in part separated to form the cavity in the base.

5. The device according to claim 4 wherein the intervening layer is raised between adjacent air cells with the raised portions of the intervening layer being separated from the sealing layer and forming channels which extend between and open into the interiors of adjacent cells, the plurality channels constituting the cavity within the base.

6. The device according to claim 4 wherein the cells are integral with the intervening layer.

7. The device according to claim 1 wherein each cell in addition to its side wall has an end wall connected across the outer end of its side wall and a connecting portion interposed between the side wall and the base and attached to the base, the end walls forming the generally continuous outwardly presented surface.

8. The device according to claim 7 wherein the connecting portion is of lesser width than the side wall when the cell is deflated so as to form a reduced neck where the cell is attached to the base.

9. The device according to claim 7 wherein the connecting portion has a generally flared shape when the cell is deflated with the greater width of that shape being at the base, so as to form an enlarged pedestal where the cell is attached to the base.

10. The device according to claim 9 wherein the greatest width of the frusto-conical connecting portion is larger than the greatest width of the side wall when the cell is deflated.

11. A cushion device comprising:

a base formed from a fluid impervious material and having a cavity therein which is isolated from the surrounding atmosphere and is capable of retaining a fluid under pressure; and

a plurality of cells connected to the base and formed from a fluid impervious material which is flexible, the cells having hollow interiors which open into the cavity of the base such that the interiors of all of the cells communicate with each other through the cavity of the base, each cell having a side wall and a flared pedestal interposed between the side wall and the base, the side wall when the cell is deflated having a plurality of flutes with the flutes being generally parallel and arranged around the entire cell and extending away from the pedestal, the pedestal when the cell is deflated being flared such that it possesses greater width at the base than at the side wall, the side walls of adjacent cells being generally spaced apart when the cells are deflated, but when the cells are pressurized the side walls are expanded such that the side walls of adjacent cells are in contact and interfere with each other, the cells when pressurized further being such that the ends of the cells form a generally continuous outwardly presented surface which conforms to the shapes of objects brought against it.