Universal penetration test apparatus and method

• US 5,467,639 A
• Filed: 08/17/1994
• Issued: 11/21/1995
• Est. Priority Date: 01/19/1993
• Status: Expired due to Fees

• Current Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Original Assignee: Mayo Foundation For Medical Education And Research (Mayo Clinic)
• Inventors: Johnson, Phillip W.
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): LARKIN, DANIEL SEAN
• Application Number:
  US08/291,745
• Time in Patent Office: 461 Days
• Field of Search: 73/38, 73/64.47, 73/818, 73/820, 73/821, 73/78, 73/81, 73/82, 73/84, 73/85
• US Class Current: 73/38
• CPC Class Codes: G01N 15/08 Investigating permeability, pore-volume, or surface area of porous materials

Abstract

A portable test apparatus and method for measuring and comparing the resistance of protective clothing materials, and other materials, to penetration by liquids, pathogens, and fluid transmissible particles. The test apparatus employs weights with center holes, which fit over an elongated weight support assembly which is held upright in a frame. To perform the test, a highly resilient and absorbent sponge is placed in a small tray and soaked with a test fluid, the test material is then placed over the sponge, a piece of absorbent paper is placed over the test material, the frame is centered above the test material, the elongated weight support assembly is placed through the center hole of the frame until the flat surface of the weight support assembly is in contact with the absorbent paper, and weights are placed onto the elongated weight support assembly. When the full pressure of single or multiple weights and elongated weight support assembly are on the test material, the test begins. Pass/failure is determined by observing the test material through the end of the transparent rod. If the fluid appears under the support member tip within a predetermined period of time, e.g., five minutes, the material fails at the weight applied. If no fluid appears, the test is repeated, with additional weights, until the material fails. After repeated samplings, the failure threshold is determined and the material'"'"'s fluid pressure resistance is recorded.

Claims

1. A universal penetration test apparatus for measuring resistance of material to a challenge fluid, comprising:

an absorbent pad capable of absorbing the challenge fluid;

an elongated weight support assembly having a top end and a bottom end, the material being positionable between the pad and the elongated weight support assembly;

frame means for supporting the elongated weight support assembly in a vertical orientation;

a plurality of weight members being slidably receivable on the elongated weight support assembly, the elongated weight support assembly including flange means for supporting the weight members on the elongated weight support assembly;

the elongated weight assembly comprising a hollow sleeve and a rod, the sleeve being telescopically received on the rod, the rod including flange means for limiting movement of the sleeve along the rod, the sleeve including flange means for limiting movement of the weight members along the sleeve, the bottom end of the rod having concentric circles of varying widths cut at different depths with an inner most concentricity having the greatest depth.

2. A universal penetration test apparatus for measuring resistance of material to a challenge fluid, comprising:

an absorbent pad capable of absorbing the challenge fluid;

an elongated weight support assembly having a top end and a bottom end, the material being positionable between the pad and the elongated weight support assembly;

a weight member being slidably received by the elongated weight support assembly; and

the elongated weight support assembly including a hollow sleeve and a rod, the sleeve being telescopically received on the rod, the rod including flange means for limiting movement of the sleeve along the rod, the sleeve including flange means for limiting movement of the weight member along the sleeve, the bottom end of the rod having concentric circles of varying widths cut at different depths with an inner most concentricity having the greatest depth.

3. A universal penetration test apparatus for measuring resistance of material to a challenge fluid, comprising:

an absorbent pad capable of absorbing the challenge fluid;

an elongated weight support assembly including a rod having a top end and a bottom end, the material being positionable between the pad and the bottom end of the rod, the bottom end of the rod having concentric circles of varying widths cut at different depths with an inner most concentricity having the greatest depth;

frame means for supporting the elongated weight support assembly in a vertical orientation; and

at least one weight member being positionable on the elongated weight support assembly.