# US 12,181,447 B2 · Drop test fixture

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- Number: US 12,181,447 B2
- Document ID: US12181447B2
- Status: Granted
- Kind: B2
- Application number: 17/942,356
- Filed: 2022-09-12
- Published: 2024-03-14
- Granted: 2024-12-31
- Earliest claimed: 2022-09-12
- Assignees: The United States of America as represented by the Secretary of the Navy
- Applicants: Sloan C. Burns; Luke Andrew Martin
- Inventors: Sloan C. Burns; Luke Andrew Martin
- Web page: https://patentgrep.com/patent/US12181447B2

## CPC

- G01N 3/303: generated only by free-falling weight
- G01N 3/02: Details
- G01N 2203/04: Chucks, fixtures, jaws, holders or anvils
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A test fixture is provided for dropping an article from a height to a floor, with the article oriented in relation to the floor at a select angle. The fixture includes a column frame, an overhead beam, a carriage, first and second guy wires, first and second spools, and first and second chains. The frame supports first and second guide arms on opposing sides. The overhead beam has a distance span substantially parallel to the floor. The guy wires attach to the beam separated the span and pass through the guide arms. The spools receive the corresponding guy wires. The chains suspend the article from the carriage above the floor. Upon release of the guy wires, the carriage falls until contact with the guide arms while the article contacts the floor.

## Claims

### Claim 1

A test fixture for dropping an article from a height to a floor, said article oriented in relation to said floor at a select angle, said fixture comprising:
a column frame for supporting first and second guide arms on opposing sides;
an overhead beam having a distance span substantially parallel to the floor;
a carriage substantially parallel to the floor, said carriage having first and second opposing guides separated by said span;
first and second guy wires attaching to said beam separated by said distance span and passing through said guide arms;
first and second spools for receiving corresponding said guy wires; and
first and second chains for suspending the article from said carriage above the floor, wherein
upon release of said guy wires, said carriage falls until contact with said guide arms while the article contacts the floor.

### Claim 2 (depends on 1)

The fixture according to claim 1, further including:
first and second bars attaching to the article, being suspended from said carriage until the article contacts the floor.

### Claim 3 (depends on 1)

The fixture according to claim 1, wherein each guide include an opposing set of wheels that wrap corresponding said guy wire.

### Claim 4 (depends on 1)

The fixture according to claim 1, wherein said carriage at opposing ends includes first and second strike brackets.

### Claim 5 (depends on 4)

The fixture according to claim 4, wherein each guide arm of said first and second guide arms includes a stop plate to intercept a corresponding strike bracket on said carriage upon said release of said guide wires.

### Claim 6 (depends on 1)

The fixture according to claim 1, wherein each guide arm of said first and second guide arms includes a roller extending inward to maintain tension of a corresponding guy wire of said first and second guy wires between said carriage and a corresponding spool of said first and second spools.

### Claim 7 (depends on 1)

The fixture according to claim 1, wherein said carriage includes longitudinal slots along which to attach said chains, enabling the article to tilt at the set angle in relation to the floor.