Fluid sprinkling – spraying – and diffusing – Container for non-fluid material – and scattering means – With means generating or supplying gaseous mixing current
Reexamination Certificate
2001-10-30
2004-04-20
Mancene, Gene (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Container for non-fluid material, and scattering means
With means generating or supplying gaseous mixing current
C291S003000
Reexamination Certificate
active
06722589
ABSTRACT:
TECHNICAL FIELD
The present invention relates to slip prevention particle injection devices which are installed in the vicinity of wheels of railway rolling stock and spread particles for preventing slippage of the wheels.
BACKGROUND ART
Rain or snow may cause slippage of wheels of railway rolling stock traveling at a high speed on rails. Indeed, wetting of the rails with rain or accumulation of snow thereon causes such effects as the decrease in tacking coefficient between the wheels and the rails, idle rotation of the wheels, decrease in traveling speed, and inability to reach the preset traveling speed. Furthermore, when brakes are applied to stop the railway rolling stock, it cannot be stopped in a predetermined stoppage position due to slippage of wheels and the stoppage time required to stop the railway rolling stock after the application of brakes is extended.
In order to resolve those problems, sand has been sprinkled between the wheels and the rails to prevent the slippage of the wheels. The conventional sand sprinkling devices had a simple structure composed of a tank for retaining the sand and a guiding duct for dropping the sand. Since the sand sprinkling mechanism was based on the sand falling under gravity, the sand was scattered by the wind pressure created by the traveling railway rolling stock and the sand was difficult to sprinkle accurately at the appropriate location between the wheels and rails.
Recently, the conventional sand sprinkling devices have been improved and a device spraying the sand by a jet has been developed.
Japanese Utility Model Application Laid-open No. S56-18203 disclosed a sand sprinkling device for railway rolling stock comprising a sand box retaining the sand, a sand sprinkling duct connected to the sand box, an air duct for feeding the air to the sand sprinkling duct, and an air duct for feeding the air to the sand box. In such a device, the sand retained in the sand box is introduced into the sand sprinkling duct by a suction force created by the compressed air fed into the sand sprinkling duct, and the sand is injected between the wheels and the rails by the compressed air.
Japanese Patent Application Laid-open No. S62-77204 disclosed a particle injector device for railway rolling stocks, comprising a particle supply duct for supplying particles such as sand and the like, a compressed air supply duct for supplying the compressed air, a mixing chamber connected to the particle supply duct and compressed air supply duct, and an injector duct connected to the mixing chamber and having an injection opening. In such a device, the compressed air supplied from the compressed air supply duct is mixed in the mixing chamber with the particles supplied from the particle supply duct and the particles together with compressed air are injected between the wheels and rails from the injection opening of the injector duct.
Japanese Examined Patent Application No. H5-14673 disclosed a particle injector device for railway rolling stock comprising a retainer tank for retaining particles such as sand and the like, a retainer chamber connected to the retainer tank via a transportation pipe, a particle supply duct connected to the retainer chamber, and a compressed air supply duct connected to an air supply duct. In this device, the compressed air is fed to the compressed air supply duct via the air supply duct, a suction force is generated in the vicinity of the outlet of the particle supply duct by the flow of compressed air, thereby introducing the particles present in the retainer chamber into the particle supply duct and injecting the particles together with the compressed air between the wheels and rails from the particle supply duct.
All of the devices described in the Japanese Utility Model Application Laid-open No. S56-18203, Japanese Patent Application Laid-open No. S62-77204, and Japanese Examined Patent Application No. H5-14673 comprise an injector duct for injecting the particles and have a structure in which compressed air is fed into the injector duct, the particles are mixed with the compressed air, and the particles are injected together with the compressed air between the wheels and rails. The drawback of all of the devices is in that the injected quantity of the particles is difficult to adjust.
Thus, the injection pressure has to be increased when the particles do not get in the appropriate location between the wheels and rails because of the wind or turbulent air flow generated in the vicinity of wheels of traveling railway rolling stock. However, the drawback of the conventional device is that the injected quantity is increased if the injection pressure is raised and the flow rate of compressed air is increased. The excessive injection of particles causes unnecessary consumption of particles and the cost of slippage prevention rises. Moreover, when the excessively sprinkled particles penetrate into a point gap, they make it impossible to operate the point or produce a negative effect on a signal circuit. Another drawback of the conventional devices is that if the compressed air quantity is adjusted so that the injected quantity does not become too high, the prescribed injection pressure cannot be obtained and the particles cannot be accurately injected at the target location between the wheels and rails.
Thus, when an attempt was made to inject the particles accurately at the target location under the prescribed injection pressure, the injected quantity became too high. On the other hand, when the compressed air quantity was adjusted so as to control the injected quantity to the appropriate level, the injection pressure was insufficient, the particles were not injected at the target location, and the adjustment of the injected quantity of particles was difficult.
Japanese Unexamined Patent Application No. H4-310464 disclosed a particle injector device for railway rolling stock comprising a tank retaining the particles, a mixing apparatus connected to the particle retainer tank, an air duct for feeding compressed air to the particle retainer tank, an air duct which is a branch of the aforesaid air duct and serves to feed compressed air into the mixing apparatus, a control apparatus for controlling the quantity of particles introduced from the particle retainer tank into the mixing apparatus, an injector duct connected to the mixing apparatus, and a pinch valve for adjusting the injected quantity. In such apparatus, particles are introduced into the mixing apparatus from the tank in which the pressure is increased by the compressed air, the particles are mixed with the compressed air inside the mixing apparatus, and the particles are injected together with compressed air between the wheels and rails from the injection opening of the injector duct. In this case, the quantity of particles introduced into the mixing chamber from the tank is adjusted to the prescribed quantity by the control apparatus. Furthermore, the injected quantity from the injector duct is adjusted by the pinch valve.
The device disclosed in Japanese Unexamined Patent Application No. H4-310464 adjusts the injected quantity of particles, but the device requires a plurality of control apparatuses and an accordingly large number of electric wirings and has a complex structure. The slip prevention particle injection devices of this type are typically installed in the vicinity of wheels, in other words, so that they are exposed to the outside. Therefore, the materials thereof are subjected to corrosion or degradation. As a result, the control apparatus can malfunction or the electric wiring system can be damaged. For those reasons, there is a need for slip prevention particle injection devices which have a simple structure.
Accordingly, the inventors have conducted an intensive study aimed at the development of an injector device in which compressed air is fed into a particle retainer tank and a mixing chamber, pressure inside the tank is increased by the compressed air, particles are fed out into the mixing chamber by the respective pushing force, the particles are mix
Matsuoka Kosuke
Ohno Kaoru
Watanabe Kouzou
Bui Thach H
Mancene Gene
Railway Technical Research Institute
Sherman & Shalloway
LandOfFree
Slip prevention particle injection device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Slip prevention particle injection device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Slip prevention particle injection device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3211581