Railway ground crosstie
AssigneeTembec Industries Inc.
InventorMichael A. N. Scobie
Life of this patent
Estimating the term…
Abstract
An elongate railway crosstie for supporting rail tracks on a bed of stones or the like, said tie having a first end, a second end, a length between said first and second ends and a top surface, a bottom surface and a pair of side surfaces between said first and second ends, characterized in that at least one of said side surfaces has a portion of a non-planar stone-embeddable form extending between said first and second ends, so-shaped as to effect reduced lateral and longitudinal slippage of said tie within said bed, while providing a reduction in the volume of material used.
Claims11
An elongate, solid, unitary railway crosstie for supporting rail tracks on a bed of stones, said tie having a first end, a second end, an inner portion between said first and second ends and a top surface, a bottom surface and a pair of side surfaces between said first and second ends, wherein
- at least one of said side surfaces has a portion of undulating portion so-shaped as to define a plurality of concave and convex surfaces which are embeddable in said bed of stones to effect reduced lateral and longitudinal slippage of said tie within said bed;
- and
- said tie has a first end portion adjacent and extending a first distance from said first end and a second end portion adjacent and extending a second distance from said second end wherein said first end portion and said second end portion define therebetween an inner portion, wherein said inner portion has a plurality of central portions defining a plurality of different inner widths narrower than the width of said first and said second end portions and a plurality of portions of widths inwardly decreasing from said first end portion and said second end portion, and wherein the crosstie is formed from a lignocellulose-resin material.
A solid, unitary railway crosstie for supporting rail tracks on a bed of stones, said tie having:
- a first end;
- a second end;
- and
- a top surface, a bottom surface and a pair of side surfaces between said first and said second ends;
- wherein said tie has a first end portion adjacent and extending a first distance from said first end and having a first end portion width;
- a second end portion adjacent and extending a second distance from said second end and having a second end portion width;
- wherein
- (i) said side surfaces of said first end portion are parallel the length of said first distance;
- (ii) said side surfaces of said second end portion are parallel the length of said second distance;
- and
- (iii) said first end portion is separated from said second portion by an inner portion;
- wherein said inner portion has
- (a) a midpoint equidistant from said first portion and said second portion and of smaller width than said first and second end portions;
- (b) side surfaces of undulating form as to define a plurality of concave and convex surfaces;
- and
- (c) a pair of tapered portions constituted by a plurality of portions having widths decreasing inwardly from said first end portion and said second end portion to said midpoint;
- and
- wherein said plurality and undulation of said concave and convex surfaces when embedded in said bed of stones effect reduced lateral and longitudinal slippage of said tie within said bed.
A method of making an elongate, solid, unitary railway crosstie for supporting rail tracks on a bed of stones, said tie having a first end, a second end, an inner portion between said first and second ends and a top surface, a bottom surface and a pair of side surfaces between said first and second ends, wherein at least one of said side surfaces has a portion of undulating portion so-shaped as to define a plurality of concave and convex surfaces which are embeddable in said bed of stones to effect reduced lateral and longitudinal slippage of said tie within said bed;
- and said tie has a first end portion adjacent and extending a first distance from said first end and a second end portion adjacent and extending a second distance from said second end wherein said first end portion and said second end portion define therebetween an inner portion, wherein said inner portion has a plurality of central portions defining a plurality of different inner widths narrower than the width of said first and said second end portions and a plurality of portions of widths inwardly decreasing from said first end portion and said second end portion, wherein the crosstie is formed of a composite material, the method comprising
- (a) providing an aqueous lignocellulose fiber pulp slurry having an effective consistency;
- (b) de-watering said slurry comprising applying multi-dimensional compression to said slurry to provide a de-watered material at an effective de-watering rate under an effective pressure to prevent or reduce the formation of fissures and voids within said material;
- and
- (c) drying an effective amount of said de-watered material at an effective temperature and period of time to provide a formed, dried lignocellulose fiber material of a crosstie shape having a thickness of at least 5 mm.
Dependencies are inferred from the claim text.