The present invention relates to the field of tamping machines and tools. The present invention more specifically relates to the field of tamping tools for adjusting and leveling ballast under railroad ties and tracks.
Railroad tracks are typically supported by ties, which rest upon ballast. Ballast is typically comprised of crushed stone, rocks, or gravel. The ballast is packed below and around the railroad ties to, among other things, bear the load from the railroad ties, facilitate water drainage, and hold the track in place. Over time, the ballast can shift or otherwise move out of place from its position packed around and below the railroad ties. Ballast tamping machines, which often run along the track, are used to move and/or tamp ballast back into place to keep the ties and track adequately supported by the ballast.
Ballast tamping machines utilize replaceable tamping tools that compress the ballast. These tools repeatedly make contact with the ballast as they are moved along the track. As a result, the tamping tools undergo a great deal of wear from the impact. Known tamping tools frequently break down, come apart, or wear quickly as a result of the impact with the ballast and need to be replaced.
In some cases, the tamping tool will include wear-resistant materials provided on top of the tool to help extend the life to the tool but, even then, the wear-resistant materials will often fall off due to the impact with ballast and contact with other components of the railroad system. For example, U.S. Pat. Nos. 7,726,246 and 5,261,763 disclose ballast-tamping tools with abrasion or wear-resistant material provided on the face of the blade of the tool, however, the material tends to break off as the tool is used, causing the tool in turn to break and require replacement.
Therefore, a tamping tool that resists wear and withstands the impact without requiring frequent replacement is needed.
Accordingly, a tamping tool which overcomes this and other difficulties is provided. The tool is provided in two parts: a shank and a paddle. In an exemplary embodiment, the shank and paddle are constructed of an impact-resistant material such as iron, steel, or an alloy such as a carbon-based alloy. The steel may be forged and/or heat-treated to improve the hardness, strength, and/or life of the material.
In an exemplary embodiment of the present invention, the shank has a number of apertures which allows the tool to be connected to a ballast tamping machine. The top of the shank has four sides, connected to the bottom of the shank, which tapers in towards the paddle and may have six sides. The shank attaches to the paddle on the opposite end of the shank from the apertures.
In one embodiment, the paddle is integrally formed with the shank. In other embodiments, the blade is coupled to the shank in other ways, for example by welding. In an exemplary embodiment of the tool, on the base of the shank, where the shank couples to the paddle, a set of wear-resistant tiles (or “wear tiles”) is provided. The wear tiles may be constructed of various wear-resistant materials, for example tungsten carbide. The wear tile will typically be brazed onto the paddle or shank using methods and materials disclosed further herein.
The paddle may have six faces—a front, back, tip, left, right, and top sides. In one or more embodiments, the paddle couples to the shank on the front side. In an exemplary embodiment, the front side of the paddle has a first ridge defining a recess that leads to the tip of the paddle. A row of wear tiles are provided in the recess.
On the back of the paddle, a series of row tiles is also provided into a groove. These row tiles are shaped so that the wear tile hooks around the tip of the paddle. The front set of wear tiles fits within the lip provided by the back hook-like wear tiles.
The paddle may have more shoulders or grooves, and more rows of wear tiles. For example, a second shoulder or groove on the front of the paddle may have further wear tiles adapted to fit within the shoulder or groove. In an exemplary embodiment of the invention, three rows are provided on the front of the tool and two rows of larger wear tiles are provided on the back of the tool, with one of the rows provided on the back wrapping around to the front. Wear tiles in that configuration are not provided on the left, right, or top sides of the paddle.
Although it is known in the art to provide a wear-resistant material on the outside of a tool, the present configuration has lead to decreased damage, increased shock absorption, and improved overall durability over known tamping-tool configurations. Wear tiles stay on the tool much longer over known tamping tools, leading to preservation of the paddle, and decreased replacement frequency.
The present disclosure provides a tamping tool comprising: a shank having an upper and lower portion, the upper portion having a plurality of apertures and the lower portion being coupled to a paddle; the paddle comprising: a first face, a second face, and a tip; a first shoulder disposed in the first face and defining a recess leading to the tip of the paddle; a plurality of first wear tiles each having an upper portion terminating in an upper edge and a lower portion that defines a ridge and which tapers into a rounded tip; the plurality of first wear tiles being at least partially provided in the recess such that the upper edge of each first wear tile at least partially abuts the first shoulder, the ridge defined in each first wear tile at partially abuts the tip of the paddle, and the lower portion of each wear tile wraps substantially around the tip.
The present disclosure further provides a tamping tool, comprising a shank and a paddle: the shank having an upper and lower portion, the upper portion being configured to couple to a tamping machine and the lower portion being coupled to the paddle; a plurality of wear tiles coupled to the lower portion of the shank; the paddle having a first face, second face, and tip; the first and second face having a plurality of wear tiles provided thereon; the first face having a first ridge and second ridge; the plurality of wear tiles including a plurality of first wear tiles, each having an upper portion terminating in an upper edge and a lower portion that defines a ridge and which tapers into a rounded tip; the plurality of first wear tiles configured such that the first wear tiles abut the ridge provided on the paddle and extend around the paddle tip.
The present disclosure further provides a method of making a tamping tool comprising: providing a paddle having a first face, a second face, a tip, and a first shoulder disposed in the first face, and defining a recess leading to the tip of the paddle; providing in the recess a first wear tile having an upper portion terminating in an upper edge, a lower portion that defines a ridge, and a face extending between the upper edge and the ridge, such that the upper edge of the first wear tile at least partially abuts the first shoulder, the ridge defined in the first wear tile at partially abuts the tip of the paddle, and the lower portion of the wear tile wraps substantially around the tip; and brazing the first wear tile to the paddle in multiple planes.
Various examples of embodiments of the systems, devices, and methods according to this invention will be described in detail, with reference to the following figures, wherein:
It should be understood that the drawings are not necessarily to scale. In certain instances, details that are not necessary to the understanding of the invention or render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiments illustrated herein.
Referring to the Figures, example embodiments of a tamping tool are provided.
As shown in
As shown in
As further illustrated in
As shown in
In various embodiments, upper portion 205 of shank 201 defines aperture 209 configured to attach or couple to a tamping machine, In various examples of embodiments, lower portion 207 angles toward and is coupled to paddle 203. As further illustrated in
Referring again to
As shown in these Figures, one or more first wear tiles 123 are at least partially provided in the recess 115 such that an upper edge 141 of first wear tile 123 abuts first step, shoulder, wall or ridge 111 and a lower edge 139 of first wear tile 123 abuts the tip or second shoulder 113. The abutment against the first and second shoulders helps to secure the first wear tile to the paddle. In various embodiments, first 111 and second 113 shoulders are designed and/or utilized to help transfer impact on first wear tiles 123 into the paddle 103 and/or shank 101 so more of the tool can help absorb the impact. The first step, shoulder, wall or ridge 111 and/or the tip or second shoulder 103 also allows the wear tiles 115 to be brazed to the paddle in one or more planes (e.g., horizontal, vertical and/or angular planes). Brazing it in various planes (e.g., at the first step, shoulder, wall or ridge) helps further secure or otherwise couple wear tile 123 to the tool and helps to transfer impact, stresses and forces on the wear tile to the paddle and/or shank.
An exemplary configuration of first wear tiles 123 is disclosed in detail in
As shown in an exemplary embodiment disclosed in
In various embodiments, including that shown in
In an exemplary embodiment, the wear tiles are made of a wear or abrasion resistant material such as tungsten carbide. It should be recognized that one skilled in the art could substitute a variety of metals in particular mixtures to achieve the invention disclosed. The wear tile and/or tiles may be provided on and/or coupled to the paddle and/or shank in a variety of ways. For example, the tiles and/or wear tiles may be coupled to the paddle and/or shank by brazing, soldering, gluing, etc. While a silver braze or filler metal is utilized to couple the tile and wear tiles to the paddle and/or shank, it should be appreciated that a variety of brazes or filler metals may be utilized including a silver-brass filler metal.
As utilized herein, the terms “approximately,” “about,” “substantially”, and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the invention as recited in the appended claims.
It should be noted that references to relative positions (e.g., “front” and “back” and “upper” and “lower”) in this description are merely used to identify various elements as are oriented in the Figures. It should be recognized that the orientation of particular components may vary greatly depending on the application in which they are used.
For the purpose of this disclosure, the term “coupled” means the joining of two members directly or indirectly to one another. Such joining may be stationary in nature or moveable in nature. Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another. Such joining may be permanent in nature or may be removable or releasable in nature.
It is also important to note that the construction and arrangement of the apparatus, methods, and devices as shown in the various examples of embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited. For example, elements shown as integrally formed may be constructed of multiple parts or elements show as multiple parts may be integrally formed, the operation of the interfaces may be reversed or otherwise varied, the length or width of the structures and/or members or connector or other elements of the system may be varied, the nature or number of adjustment positions provided between the elements may be varied (e.g. by variations in the number of engagement slots or size of the engagement slots or type of engagement). The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the various examples of embodiments without departing from the spirit or scope of the present inventions.
While this invention has been described in conjunction with the examples of embodiments outlined above, various alternatives, modifications, variations, improvements and/or substantial equivalents, whether known or that are or may be presently foreseen, may become apparent to those having at least ordinary skill in the art. Accordingly, the examples of embodiments of the invention, as set forth above, are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit or scope of the invention. Therefore, the invention is intended to embrace all known or earlier developed alternatives, modifications, variations, improvements and/or substantial equivalents.
This application claims priority to U.S. Provisional Application 61/941,320, filed Feb. 18, 2014, which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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61941320 | Feb 2014 | US |