Patents Assigned to Stedef S.A.
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Patent number: 4609144Abstract: A universal railroad tie cover of a substantially rectangular configuration is provided which is composed of an elastomer material having one or more openings for receiving one or more elastomer pads for increasing the resiliency of rail fastening systems in railroad track beds with and without ballast to prolong the service life of timber and concrete railroad ties. The universal railroad tie cover has a center section with at least one opening and two side portions for receiving interchangeable specially designed pads some of which may be designed for a particular system and/or for wood or concrete ties to prolong operational life by increasing the resiliency of the rail fastening system. The universal railroad tie cover and particular pads are designed to be manufactured and shipped in a flat configuration which can be cut and installed as a three dimensional cover at the work site to accommodate varying lengths of timber and concrete ties as may be required in special track work.Type: GrantFiled: April 27, 1984Date of Patent: September 2, 1986Assignee: STEDEF S.A.Inventor: John L. Harmsen
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Patent number: 4489884Abstract: A railroad tie cover of a substantially rectangular configuration composed of an elastomer material with or without an optional pad is provided for increasing the resiliency of rail fastening track systems in railroad track beds with and without ballast to prolong the service life of timber and concrete railroad ties. The railroad tie cover has a center and two side portions which utilize a plurality of grooves that are designed to prolong the operational life of wooden and concrete ties by increasing the resiliency of the rail fastening system and in the case of the wooden timber ties prolong the life of the tie by channeling and transporting water and moisture away from the railroad timber tie. The number, depth and disposition of the grooves with or without the pad in the alternative embodiment fosters the circulation of air around the timber tie during the loading and unloading of the track as occurs during train passage.Type: GrantFiled: September 30, 1982Date of Patent: December 25, 1984Assignee: Stedef S.A.Inventor: John L. Harmsen
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Patent number: 4356968Abstract: A railroad timber tie cover of a substantially rectangular configuration composed of an elastomer material is provided for increasing the resiliency of rail fastening track systems in railroad track beds with and without ballast to prolong the service life of timber and concrete railroad ties. The railroad tie cover has a center and two side portions which utilize a plurality of grooves that are designed to prolong the operational life of wooden timber ties by increasing the resiliency of the rail fastening system and in the case of the wooden timber ties prolong the life of the tie by channeling and transporting water and moisture away from the railroad timber tie. The number, depth and disposition of the grooves foster the circulation of air around the timber tie during the loading and unloading of the track as occurs during train passage. The railroad tie cover is designed to be manufactured and shipped in a flat configuration which is installed as a three dimensional cover at the work site.Type: GrantFiled: October 10, 1980Date of Patent: November 2, 1982Assignee: Stedef S.A.Inventor: John L. Harmsen
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Patent number: 4266720Abstract: A resilient rail clip or fastener formed in a generally trapezoidal configuration from springsteel is provided for securing rail track to railroad ties that may be constructed from a variety of materials. The trapezoidal shaped resilient rail clip has a long edge for gripping the rail which when untensioned forms a type of sine shaped curve and which when tensioned to the rail, utilizing two spikes or screws per clip, transforms the sine shaped curve into a linear line that is biased flat against the foot of the rail.Type: GrantFiled: December 20, 1979Date of Patent: May 12, 1981Assignee: Stedef S.A.Inventor: John L. Harmsen