|Publication number||USRE40735 E1|
|Application number||US 11/714,264|
|Publication date||Jun 16, 2009|
|Filing date||Feb 28, 2007|
|Priority date||Oct 16, 2001|
|Also published as||CA2461035A1, CA2461035C, DE50213334D1, EP1438203A1, EP1438203B1, US6938935, US20050001434, WO2003033279A1|
|Publication number||11714264, 714264, US RE40735 E1, US RE40735E1, US-E1-RE40735, USRE40735 E1, USRE40735E1|
|Original Assignee||Faiveley Transport|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Referenced by (2), Classifications (13), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The application is a continuation of International Application No. PCT/EP02/10412 filed Sep. 17, 2002, the contents of which are here incorporated by reference in their entirety.
1. Field of the Invention
The invention concerns a metering or dosing device for sand spreading apparatuses, especially for rail vehicles for spreading sand between wheel and rail.
2. Prior Art
In known sand-scattering apparatuses of this type the sand flows from the supply tank for the sand to the wheel through a housing with a throughflow borehole, wherein the amount of throughflow or the throughflow jet for the sand is controlled by a metering piston that is controlled electrically, pneumatically or in another manner and regulates the throughflow opening from 0 to a prescribed value. When the metering piston is closed, it sits with an end seal on the edge of the opening of the throughflow borehole and opens it when the piston is drawn back. The opening gap is pre-adjusted as a function of the coarseness of the sand used to avoid bridgings on the required minimum gap and thus also obligatory predetermines a random amount of sand in connection with the annular opening gap. However, this system was not completely satisfactory for certain sand demands, especially pneumatic sand demands because the sand qualities are adjustable only in relatively large tolerances so that defined small amounts of sand are attainable only unsatisfactorily with the known system in certain cases.
The problem of the present invention is to find measures by which a supplying of small sand amounts is also adjustable.
This problem is solved in that a labyrinth-like section is provided in the throughflow or passage hole according to the invention.
According to another feature of the invention, the labyrinth-like section runs crosswise to the direction of throughflow.
According to another feature of the invention, the labyrinth-like section is developed by a profile on the sealing surface of the metering piston and/or the opposite wall of the sand passage opening.
According to another feature of the invention, there is an overlapping between the housing and sealing profile in the arrangement of the sealing profile on both the housing and the metering piston at a maximum metering piston opening stroke.
Additional features of the invention are elucidated in more detail with reference to the drawings, in which:
In the metering piston according to the invention according to
With the sand passage opening according to the invention, the opening originally designed as a hole in the housing of the metering and shut-off opening is modified into a slit-like cross section, by which the advantage is obtained that the sand discharge opening that forms in the lower sand discharge zone is modified uniformly linearly in the surface as a function of the opening stroke of the metering piston.
The slit width of the sand passage opening in the housing of the metering and shut-off device is reduced to a minimum relative to a minimum amount of sand and the slit length is adapted relative to a maximum amount of sand so that a secure sand discharge is obtained in said quantitative tolerance with the grades of sand considered typical.
The slit width in connection with the adjusted opening stroke of the metering piston (distance from the metering piston sealing surface to the housing sealing surface) determines the effective sand discharge opening. It also essentially defines the suction surface in connection with the injector action.
A classic form of the profile can be annular with a triangular cross section running outward essentially to a point. However, any other profile design, whether as a uniform or interrupted ring, is possible.
A continuously adjustable amount of sand as with a linearly moved slide valve is possible with the metering device according to the invention, without the wear and energy expenditure occurring in a slide valve.
Although the invention has been described in terms of preferred embodiments, nevertheless changes and modification will be apparent to those skilled in the art from the teachings herein. Such changes and modification that do not depart from the spirit, scope and teachings herein are deemed to fall with the purview of the invention a claimed.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US528998 *||Mar 15, 1894||Nov 13, 1894||Sanding device|
|US769929 *||Jul 5, 1904||Sep 13, 1904||Christian Allenbach||Railway-sanding device.|
|US772218 *||Jul 2, 1904||Oct 11, 1904||David Kleintop||Sanding device.|
|US867055 *||May 6, 1907||Sep 24, 1907||Albert F Kubicek||Automatic air sanding-machine.|
|US872104 *||Mar 22, 1907||Nov 26, 1907||Abbott L Bacon||Sand-box for cars.|
|US2334181 *||Jan 14, 1942||Nov 16, 1943||Highway Safety Appliances Inc||Valve for road sanding machines|
|US2522677 *||Dec 3, 1948||Sep 19, 1950||Kelly Daniel A||Vehicle sander|
|US5785212 *||Aug 14, 1996||Jul 28, 1998||Steiger; Arthur||Plastic dispense tap for liquid bulk containers|
|CH423860A||Title not available|
|DE1480718A1||May 17, 1965||Aug 14, 1969||Zeh Geb Bachus Heiderose||Vorrichtung zum Streuen von Streugut vor die Raeder von Kraftfahrzeugen|
|DE19547746A1||Dec 20, 1995||Jul 18, 1996||Norbert Goldmann||Scattering device with hopper and dosing and delivery mechanisms|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8073591||Sep 20, 2007||Dec 6, 2011||Faiveley Transport||Method and apparatus for monitoring sand supply to a scattering device for a rail vehicle|
|US20090254231 *||Sep 20, 2007||Oct 8, 2009||Faiveley Transport||Method and device for monitoring and preparing the sand supply in a sand tank of sand scattering devices in vehicles, in particular rail vehicles|
|U.S. Classification||291/1, 222/509, 222/518, 222/561, 222/559|
|International Classification||B67D3/00, B61C15/10, B60B39/04, F16J15/16|
|Cooperative Classification||B60B39/04, B61C15/10|
|European Classification||B60B39/04, B61C15/10|
|Jun 16, 2008||AS||Assignment|
Owner name: FAIVELEY TRANSPORT, FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GOLDMANN, NORBERT;BARTLING, LUISE;REEL/FRAME:021096/0202
Effective date: 20080602
|Jan 5, 2009||AS||Assignment|
Owner name: FAIVELEY TRANSPORT, FRANCE
Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE S ADDRESS PREVIOUSLY RECORDED ON REEL 021096 FRAME 0202;ASSIGNORS:GOLDMANN, NORBERT;BARTLING, LUISE;REEL/FRAME:022052/0602
Effective date: 20080602
|Mar 1, 2013||FPAY||Fee payment|
Year of fee payment: 8