Direct fixation fastener

Abstract

A bonded, direct fixation fastener as supportive structure for a rail on a railroad bed comprising: a substantially rectangular rail plate, wherein the rail plate has a generally horizontal center portion having a lower face and an upper face and wherein the rail plate defines an outer perimeter having a face defining a first angle to the railroad bed, the rail plate having attachment means to attach to the rail; a substantially rectangular bottom member defines an inner perimeter having a face defining a second angle to the railroad bed; and a substantially rectangular elastomeric portion disposed between, and bonded to each of, the outer perimeter and face of the rail plate and the inner perimeter and face of the bottom member.

Claims

1. A bonded, direct fixation fastener as supportive structure for a rail on a railroad bed comprising: a rectangular rail plate, wherein the rail plate has a generally horizontal and rectangular center portion having a lower face and an upper face and first and second opposed sides and wherein the rail plate defines an outer perimeter having a face defining a first angle to the railroad bed, the rail plate having first and second attachment means to attach to the rail, wherein the first attachment means is centered on the first side of the generally horizontal and rectangular center portion and the second attachment means is centered on the second side of the generally horizontal and rectangular center portion; a rectangular bottom member defines an inner perimeter having a face defining a second angle to the railroad bed; and a rectangular elastomeric portion disposed between, and bonded to each of, the outer perimeter and face of the rail plate and the inner perimeter and face of the bottom member.

2. The bonded, direct fixation fastener of claim 1 wherein the bottom member and rail plate are cast steel or ductile iron.

3. The bonded, direct fixation fastener of claim 1 further comprising a rail attachment means comprising channels to receive rail fastening means.

4. The bonded, direct fixation fastener of claim 1 further comprising a bottom member attachment means for attaching to the railroad bed comprising an aperture for receiving bottom member fastening means.

5. The direct fixation fastener of claim 1 wherein the elastomeric portion is composed of rubber.

6. The direct fixation fastener of claim 1 wherein the elastomeric portion comprises rubber.

7. The direct fixation fastener of claim 1 wherein the first angle is constant all around the outer perimeter of the rail plate.

8. The direct fixation fastener of claim 1 wherein the second angle is constant all around the inner perimeter of the bottom member.

9. The direct fixation fastener of claim 1 wherein the first angle is equal or substantially equal to the second angle and each of the first angle and second angle is between about 55 to about 70.

10. The direct fixation fastener of claim 1 wherein the elastomeric portion has a uniform or substantially uniform thickness.

11. The direct fixation fastener of claim 1 wherein the elastomeric portion has a hardness of about 47 to about 67 durometer.

12. The direct fixation fastener of claim 1 wherein the elastomeric portion has a hardness of about 57 to about 67 durometer.

13. The direct fixation fastener of claim 12 wherein the first angle is equal or substantially equal to the second angle and each of the first angle and second angle is between about 55 to about 65.

14. The direct fixation fastener of claim 1 that produces a vertical spring-rate in the range of 42000 lbs/in to 61000 lbs/in.

15. The direct fixation fastener of claim 1 wherein the first angle is equal or substantially equal to the second angle and each of the first angle and second angle is between about 55 to about 60.

16. The direct fixation fastener of claim 1 wherein the elastomeric portion has a hardness of about 47 to about 57 durometer.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) For the present disclosure to be easily understood and readily practiced, the present disclosure will now be described for purposes of illustration and not limitation in connection with the following figures, wherein:

(2) FIG. 1 is a top plan view of the direct fixation fastener of the present disclosure;

(3) FIG. 1A is a cross-sectional view thereof along line A-A of FIG. 1;

(4) FIG. 1B is a cross-sectional view thereof along line B-B of FIG. 1;

(5) FIG. 2 is a top plan view thereof;

(6) FIG. 3 is a bottom plan view thereof;

(7) FIG. 4 is a front elevational view thereof;

(8) FIG. 5 is a right elevational view thereof;

(9) FIG. 6 is a rear elevational view thereof;

(10) FIG. 7 is a left elevational view thereof;

(11) FIG. 8 is a top right front perspective view thereof;

(12) FIG. 9 is a top left front perspective view thereof;

(13) FIG. 10 is a bottom left front perspective view thereof; and

(14) FIG. 11 is a bottom right front perspective view thereof.

DETAILED DESCRIPTION

(15) In the following detailed description, reference is made to the accompanying examples and figures that form a part hereof, and in which is shown, by way of illustration, specific embodiments in which the inventive subject matter may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice them, and it is to be understood that other embodiments may be utilized and that structural or logical changes may be made without departing from the scope of the inventive subject matter. Such embodiments of the inventive subject matter may be referred to, individually and/or collectively, herein by the term invention merely for convenience and without intending to voluntarily limit the scope of this application to any single disclosure or inventive concept if more than one is in fact disclosed.

(16) The following description is, therefore, not to be taken in a limited sense, and the scope of the inventive subject matter is defined by the appended claims and their equivalents.

(17) An illustrated preferred embodiment of the dual durometer BDFF 10 of the present disclosure is shown in FIGS. 1-11. The BDFF 10 comprises a substantially rectangular rail plate 20, wherein the rail plate 20 has a generally horizontal rectangular flat center portion 34 having a lower face 22 and an upper face 16. The rail plate 20 has an outer perimeter 21 having a face 30 defining a first angle 23 preferably of about 55 to 70 or also preferably from about 55 to 65 or also preferably from about 55 to 60 to a generally flat horizontal rail bed (not shown). The rail plate 20 has rail attachment means 38 to attach the rail plate 20 to a railroad rail (not shown). The rail plate 20 may be made of any durable metal or alloy, and is preferably made of cast steel or ductile iron.

(18) A preferred embodiment of the BDFF 10 of the present disclosure further comprises a substantially rectangular bottom member 28, having an interior perimeter 29 having a face 27 defining a second angle 24, preferably of about 55 to 70 or also preferably from about 55 to 65 or also preferably from about 55 to 60 to a generally flat horizontal rail bed (not shown). The bottom member 28 may be made of any durable metal or alloy, and is preferably made of cast steel or ductile iron.

(19) Between the rail plate 20 and the bottom member 28 is an elastomeric portion 44 of relatively lower durometer hardness, preferably in the range of 47 to 67 durometer and more preferably in the range of 57 to 67 durometer, bonded to the bottom member interior perimeter 29 and face 27 and to the rail plate outer perimeter 21 and face 30. Preferably, the elastomeric portion 44 is of relatively uniform thickness all the way around the BDFF 10.

(20) The rail attachment means 38 may be any as used in the rail industry. In a preferred embodiment, at least one channel 48 is formed in the rail plate 20. Preferably, the rail plate 20 may be attached to a railroad rail by means of the channel 48 using a clip (not shown). More preferably, the clip may comprise a spring clip of a Pandrol design which is in standard use in the rail industry.

(21) The bottom member 28 is preferably adapted to be attached to the rail bed (not shown). More preferably, the adaption is an aperture 54 in the bottom member 28. The bottom member 28 may be attached by any means used in the rail industry including spikes, screws, bolts, clips, spring clips, and bolt clamps.

(22) Preferably the BDFF 10 of the present disclosure produces a vertical spring-rate in the range of 42000 lbs/in to 61000 lbs/in.

(23) In the foregoing Detailed Description, various features are grouped together in a single embodiment to streamline the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the disclosure require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment.