Cushioning device formed from separate reshapable cells

• US 5,592,706 A
• Filed: 11/09/1993
• Issued: 01/14/1997
• Est. Priority Date: 11/09/1993
• Status: Expired due to Term

• Current Assignee: Edizone LC (Edizone)
• Original Assignee: Lc Teksource, Nike, Inc., Nike International Ltd. (Nike, Inc.)
• Inventors: Pearce, Tony M.
• Primary Examiner(s): Grosz, Alexander
• Application Number:
  US08/149,224
• Time in Patent Office: 1,162 Days
• Field of Search: 5/654, 5/455, 5/449, 5/450, 5/451, 5/909, 5/911, 5/922, 5/464, 5/448, 297/180.13, 297/284.6, 297/452.41, 297/452.42
• US Class Current: 5/654
• CPC Class Codes: A47C 27/083 with pressure control, e.g. with pressure sensors
• CPC Class Codes: A47C 27/10 with two or more independently-fillable chambers
• CPC Class Codes: A61G 2203/34 for pressure
• CPC Class Codes: A61G 5/1043 Cushions specially adapted for wheelchairs
• CPC Class Codes: A61G 5/1045 for the seat portion
• CPC Class Codes: A61G 5/1091 Cushions, seats or abduction devices
• CPC Class Codes: A61G 7/05769 with inflatable chambers
• CPC Class Codes: Y10S 5/922 with hook and loop type fastener

Abstract

A cushion that includes a base and numerous bladders locatable on the base is disclosed and claimed. Each bladder contains a quantity of filler insufficient to completely fill the bladder, and each bladder has a loose or elastomeric skin to accommodate its conforming to the shape of an object to be supported by the cushion. The top surface of each bladder acts as a hammock when supporting a cushioned object, and the bladders interact with each other to accommodate protuberance and crevices of the cushioned object. Other embodiments of the invention include a cushion that is pre-shaped in a form complementary to the shape of the object to be cushioned, and a cushion that re-shapes itself to maintain supporting forces that are generally equal across the contact surface of the supported object.

Claims

1. A cushioning device comprising:

(a) a base,

(b) a plurality of individual bladders comprising an elastomeric material, said bladders being attachable to and detachable from said base,

(c) a filler within each of said bladders, and

(d) a cover;

wherein the quantity of filler within each bladder is in the range of 10% to 95% of the unstretched volumetric capacity of the bladder;

wherein said filler is a fluid which flows under slight pressure, shears easily and has low shape memory;

wherein the volumetric capacity of each bladder is in the range of 105% to 1000% of the space allotted to the bladder on the base;

wherein each bladder forms a supporting hammock across its top surface when a supported object rests on it;

wherein said cushioning device is capable of generally equalizing supporting hammock forces across the contact area of a supported object by conforming itself to the shape of the supported area including accommodating uneven surfaces such as protuberances and crevices;

wherein said cushioning device is adapted to contact and support an area of a human body and wherein supporting pressure exerted by said cushion on the contact surface of the body is less than that which would cause tissue damage and lead to decubitus ulcers;

wherein each bladder is sealed in order to prevent fluid communication between any two bladders, so that when required to support a cushioned object, said bladders interact with each other in a manner such that a bladder beneath a protuberance of the cushioned object is depressed and in turn exerts a generally lateral force on adjacent bladders, forcing the adjacent bladders upward to fill crevices of the cushioned object, thereby providing uniform support across the contact surface of the cushioned object;

wherein said bladders are filled with a flowable filler that includes microspheres and a quantity of lubricant sufficient to lubricate the exterior surfaces of said microspheres but insufficient to disperse the microspheres in the lubricant; and

wherein said bladders are arranged in an array, said array having a width of N bladders and a length of M bladders, where both M and N are greater than 2.

2. A cushioning device as recited in claim 1, wherein each of said bladders is attached to said base by a small portion of its total surface area, permitting the bladder substantially unrestricted movement, except for its attachment point, to accommodate the shape of a supported body.

3. A cushioning device as recited in claim 1, wherein said bladders are attachable to said base by hook and loop attachment means.

4. A cushioning device as recited in claim 1, wherein said array is rectangular.