Stephen A Mcmahon

US Patent:

7004017, Feb 28, 2006

Filed:

Apr 12, 2004

Appl. No.:

10/823013

Inventors:

Stephen Michael McMahon - Quincy MA, US

Assignee:

Instron Corporation - Canton MA

International Classification:

G01N 3/52

US Classification:

73 85

Abstract:

A latching coupling device for material testers is provided. The coupling can be connected and disconnected without the use of tools and includes a housing and interfacer. A spring within the latching coupling device serves to center the interfacer while snapping the interfacer shoulder and end face into compressive contact. The invention is preferably used in conjunction with penetration hardness testers and includes a penetration interfacer with an angled surface.

US Patent:

48234737, Apr 25, 1989

Filed:

Feb 13, 1987

Appl. No.:

7/014809

Inventors:

Stephen M. McMahon - Quincy MA

Assignee:

Instron Corporation - Canton MA

International Classification:

G01B 500

US Classification:

33787

Abstract:

An extensometer for measuring strain in a materials test speciment including a frame, a pair of arms each having one end for contacting a portion of the specimen and a remote end, and a noncontact sensor assembly mounted on the arms to measure change in distance between the contact ends, the arms being pivotally supported between the ends by the frame at the centers of gravity of the arms and attached components of the sensor, to permit the arms to be freely pivotal.

US Patent:

53298209, Jul 19, 1994

Filed:

May 17, 1993

Appl. No.:

8/062701

Inventors:

Stephen M. McMahon - Quincy MA

Assignee:

Instron Corporation - Canton MA

International Classification:

G01N 308

US Classification:

73833

Abstract:

A materials testing grip for tensile testing of small fibers includes a pair of inwardlyconverging surfaces into which a fiber may be easily pressed, and which in fiber tension is characterized by increased gripping force.

US Patent:

20200027324, Jan 23, 2020

Filed:

Dec 5, 2018

Appl. No.:

16/210547

Inventors:

- Glenview IL, US
Stephen MCMAHON - Quincy MA, US
Zachary HARVEY - East Weymouth MA, US

International Classification:

G08B 13/16
G08B 13/196

Abstract:

This disclosure relates to method of enhancing the three-dimensional detection range of a vision-based, single camera intrusion detection system within a tensile test machine or other materials testing machine. Illumination sources are offset from the camera and provide a cones of illumination which intersect with the conical viewing zone of the camera thereby defining a detection zone. When objects intrude into these conical regions, a shadow is cast. The shadow is detected by the camera. The detection of the intrusion is typically used as a safety function to deactivate at least part of the function of the materials testing machine.

US Patent:

20190212139, Jul 11, 2019

Filed:

May 11, 2017

Appl. No.:

16/099247

Inventors:

Roy ALLEN - North Andover MA, US
Stephen M. MCMAHON - Quincy MA, US

International Classification:

G01B 21/04
G01B 11/16
G06T 7/80
H04N 13/239
H04N 13/246

Abstract:

This disclosure relates to methods and tools for calibrating a camera-based three-dimensional optical metrology system such as that used for non-contact measurement of strain in a materials test system. A tool is provided which holds a calibration plate within a test space of a load frame of a materials testing device. The tool includes a spindle which rotates around a rotational axis to a series of detent rotational positions. The spindle engages the calibration plate by a bearing configuration which allows the tilt angle of the calibration plate to be varied. The rotation of the spindle and the variation of the tilt angle provides for two degrees of freedom of movement within the test space. The resulting sequence of calibration plate positions is systematic and repeatable.

US Patent:

20160252437, Sep 1, 2016

Filed:

Nov 4, 2014

Appl. No.:

15/033234

Inventors:

- Glenview IL, US
Peter BERMUDEZ - Dartmouth MA, US
Stephen M. MCMAHON - Quincy MA, US
Adrian RIDDICK - Medfield MA, US
Fernando L. CASTRO - Westwood MA, US

International Classification:

G01N 3/08

Abstract:

The present disclosure provides an electro-mechanical fuse-type configuration built into the probe that contacts the specimen during materials testing. The design includes an internal pre-loaded compression spring and an electrical contact switch. The coil spring preloaded to the desired safety load results in the probe assembly directly passing the load from the probe tip to the load cell for loads under the point where the spring additionally compresses. Upon deflection of the spring in excess of safety preload, the spring internally compresses within the probe coupling rather than the probe tip continuing to displace into the specimen, thereby switching the state of the electrical contact switch and stopping operation of the materials testing device. In a further configuration, excessive travel of the load cell coupling is detected, and, in response, operation of the materials testing device is stopped.