Stacked sheet shock absorbing elastomeric device

• US 6,749,924 B2
• Filed: 05/09/2002
• Issued: 06/15/2004
• Est. Priority Date: 05/09/2002
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Revely, Wesley E., Monson, Robert J., McCollough, Trevor J.
• Primary Examiner(s): Pyon, Harold
• Assistant Examiner(s): Nordmeyer, Patricia L.
• Application Number:
  US10/142,387
• Publication Number:
  US 20030211283A1
• Time in Patent Office: 768 Days
• Field of Search: 428/131-140, 267/141, 267/140.11, 267/292, 267/160, 248/636, 248/638, 181/207, 181/208
• US Class Current: 428/137
• CPC Class Codes: B32B 25/04 comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/043; next to a bituminous or tarry layer B32B11/044; next to a water setting substance layer B32B13/042; next to a metal layer B32B15/06; next to a glass layer B32B17/063; next to a layer formed of natural mineral fibres or particles B32B19/043; next to a wood layer B32B21/045; next to a cellulosic plastic layer B32B23/046
• CPC Class Codes: B32B 3/10 characterised by a discontinuous layer, i.e. formed of separate pieces of material
• CPC Class Codes: F16F 1/3737 Planar, e.g. in sheet form vibration dampers comprising one or more constrained viscoelastic layers F16F9/306
• CPC Class Codes: F16F 1/377 having holes or openings F16F1/37 , F16F1/387 take precedence
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24322 Composite web or sheet

Abstract

A stack of sheet elastomers, each having multiple holes therein, dissipates shock forces applied to it. The elastomeric sheets are formed with identical holes each of which have a periphery that is symmetrical around the centers of the holes that extend over a shock dissipation area of the device. The sheets are stacked so that one, or more continuous material passageways are formed through the stack that extend from one support surface to a parallel support surface. This allows for the elastomer material of these passageways to transmit sheer shock forces when a compressive force is applied normal to the support surfaces. Elastomeric, or other material of a composition different, preferably elastomeric, from the material of the stacked sheets, may be filled into holes of the sheets to adjust the characteristics of the device.

Claims

1. A structure comprising a plurality of elastomeric sheets wherein:

(a) each of said elastomeric sheets is formed with a multitude of uniformly spaced holes each of which have a periphery that is symmetrical about its center; and

(b) said sheets are stacked upon each other in layers such that at least one passageway of continuous elastomeric material is formed through said structure from a first exterior surface to a second exterior surface parallel to said first exterior surface for dissipating compressive forces applied normal to said first and second exterior surfaces, wherein each of said passageways are located between two parallel lines that extend through the centers of holes of all of the different layers of elastomeric sheets and wherein said parallel lines form an obtuse angle with said first and said second exterior surfaces.

2. A structure as claimed in claim 1, wherein said holes are circular and the diameter of said holes is equal to the distance between their centers and the centers of adjacent neighboring holes.

3. A structure as claimed in claim 1, wherein at least some of said holes are filled with a material of a different material than the elastomeric material of which said sheets are composed.

4. A structure as claimed in claim 3, wherein said holes are circular and the diameter of said holes is equal to the distance between their centers and the centers of adjacent neighboring holes.