Company Filing History:
Years Active: 1991-1997
Title: David M Johnson: Innovator in Maintenance Vehicle Technology
Introduction
David M Johnson is a notable inventor based in Matlock, GB. He has made significant contributions to the field of maintenance vehicles, holding 2 patents that showcase his innovative approach to improving railroad track maintenance.
Latest Patents
One of his latest patents is a maintenance vehicle and method for measuring and maintaining the level of a railroad track in a single pass. This invention involves an instrument carriage, or frog, that is towed by the maintenance vehicle and maintains a fixed relationship to it. The frog is equipped with at least one inclinometer to measure the longitudinal level and crossfall of the track. As the vehicle periodically stops to work on the track, such as during tamping or stoneblowing, the inclinometers are given the necessary settling time for accurate readings. Additionally, the method includes measuring and modeling the track prior to working using a primary measurement system, followed by a second measurement while the track is being worked on using the frog.
Another significant patent by Johnson is a method of producing a contoured work surface. This method involves creating a reference plane and traversing a working tool in a direction generally parallel to that reference plane. The distance of the working tool from the reference plane is varied according to instructions from a computer, allowing for the creation of work surfaces that are not limited to flat planar forms.
Career Highlights
Throughout his career, David M Johnson has worked with several companies, including John Kelly Limited, which specializes in lasers, and Pandrol Jackson, Inc. His experience in these organizations has contributed to his expertise in the field of maintenance vehicles and innovative engineering solutions.
Collaborations
Johnson has collaborated with notable coworkers such as Dennis A Sroka and William E Perry. Their combined efforts have likely fostered an environment of innovation and creativity in their respective projects.
Conclusion
David M Johnson's contributions to the field of maintenance vehicle technology demonstrate his commitment to innovation and improvement in railroad track maintenance. His patents reflect a deep understanding of engineering principles and a desire to enhance operational efficiency.