System for verification of testing machine speed

Patent metadata

Field	Value
Publication number	US-10782218-B2
Application number	US-201816023036-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jun 29, 2018
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

The present disclosure relates to a system for verification of the speed of crosshead travel in a materials testing device. A linear displacement device is mounted on the crosshead of the materials testing device. The linear displacement device measures the displacement of the crosshead during the test. A timer interval counter measures the time of travel of the crosshead during the test. This measurements allow for accurate calculation of the speed of the crosshead travel.

First claim

What is claimed is:

1. A method for calculating speed of a crosshead in a materials testing device moving from a starting time to an ending time, including the steps of: providing a linear displacement measuring device mounted on a crosshead of a materials testing device configured to measure linear displacement at the starting time and the ending time and generating a digital signal; providing a computing device configured to calculate an average speed of the crosshead using measured linear displacement and time at the starting time and the ending time; providing a time measuring device configured to measure time at the starting time and the ending time, the time measuring device including a port configured for communicating data, including the starting time and the ending time, to the computing device and the time measuring device further including a port configured to trigger the time measuring device during calibration of the time measuring device; and providing a linear encoder configured to receive the digital signal from the linear displacement measuring device.

2. The method of claim 1 computing device receives an output from the linear encoder.

3. The method of claim 2 wherein the time measuring device is a timer interval counter.

4. The method of claim 3 wherein the timer interval counter is in communication with the computing device.

5. The method of claim 4 wherein the computing device is in communication with the materials testing device.

6. The method of claim 5 wherein the communication between the computing device and the linear encoder, between the computing device and the timer interval counter and between the computing device and the materials testing device is performed by respective first, second and third USB connections.

7. A system for calculating speed of a crosshead in a materials testing device moving from a starting time to an ending time, including: a linear displacement measuring device mounted on a crosshead of a materials testing device configured to measure linear displacement at the starting time and the ending time and generating a digital signal; a computing device configured to calculate an average speed of the crosshead using measured linear displacement at the starting time and the ending time; a time measuring device configured to measure time at the starting time and ending time, the time measuring device including a port configured for communicating data, including the starting time and ending time, to the computing device and the time measuring device further including a port configured to trigger the time measuring device during calibration of the time measuring device; and a linear encoder configured to receive the digital signal from the linear displacement measuring device.

8. The system of claim 7 wherein the computing device receives an output from the linear encoder.

9. The system of claim 8 wherein the time measuring device is a timer interval counter.

10. The system of claim 9 wherein the timer interval counter is in communication with the computing device.

11. The system of claim 10 wherein the computing device is in communication with the materials testing device.

12. The system of claim 11 wherein the communication between the computing device and the linear encoder, between the computing device and the timer interval counter and between the computing device and the materials testing device is performed by respective first, second and third USB connections.

Assignees

• Illinois Tool Works

Inventors

• Spader Howard
• Caesar Daniel

Classifications

• G01N3/62 Primary

  Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups · CPC title

• G01P21/02

  of speedometers · CPC title

• G01P3/50

  for measuring linear speed (G01P3/56 takes precedence) · CPC title

• G01P3/64 Primary

  Devices characterised by the determination of the time taken to traverse a fixed distance · CPC title