Paul M Ford

US Patent:

50834630, Jan 28, 1992

Filed:

Feb 7, 1990

Appl. No.:

7/476175

Inventors:

Philip Marshall - Lexington MA
Paul Ford - Maynard MA

Assignee:

M/RAD Corporation - Woburn MA

International Classification:

G01N 2900
B06B 300

US Classification:

73663

Abstract:

A vibration test fixture assembly for releasably securing a test object to the top surface of a sliptable and for rotatably supporting the test object so that the test object can be repositioned between vibration tests without detaching the test object from the fixture. The assembly comprises a bottom plate, a top plate positioned on top of the bottom plate, and a plurality of spring-loaded bearing assemblies between the top and bottom plates for permitting the top plate to rotate relative to the bottom plate except when a downward force of sufficient magnitude to overcome the spring bias of the bearing assemblies is applied to the top plate. The assembly also comprises a plurality of clamps positioned adjacent the top plate for applying a downward force to the top plate sufficient to overcome the spring bias of the bearing assemblies and cause the top plate to engage the bottom plate. The test object is secured to the top plate and the bottom plate is secured to the top surface of a sliptable.

US Patent:

48481602, Jul 18, 1989

Filed:

Oct 25, 1988

Appl. No.:

7/265310

Inventors:

Philip Marshall - Lexington MA
Jeffrey Marshall - Arlington MA
Paul Ford - Arlington MA
Darryl Huttunen - Malden MA

Assignee:

M/RAD Corporation - Woburn MA

International Classification:

G01M 700

US Classification:

73663

Abstract:

A vibration test fixture system for use with a conventional shaker table. The fixture system includes a cube fixture for supporting an object to be tested and a head expander for supporting the cube fixture and for providing a mechanical and vibration transmissive connection between the cube fixture and the shaker table. The fixture system also includes an index mechanism for automatically repositioning the cube fixture relative to the head expander so that the object may be vibration tested along mutually orthogonal axes of the object.