WO2012061671A2 - Système de libération de frein à main d'un wagon de chemin de fer - Google Patents
Système de libération de frein à main d'un wagon de chemin de fer Download PDFInfo
- Publication number
- WO2012061671A2 WO2012061671A2 PCT/US2011/059261 US2011059261W WO2012061671A2 WO 2012061671 A2 WO2012061671 A2 WO 2012061671A2 US 2011059261 W US2011059261 W US 2011059261W WO 2012061671 A2 WO2012061671 A2 WO 2012061671A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hand brake
- release
- brake
- actuator
- hand
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
- B61H13/00—Actuating rail vehicle brakes
- B61H13/02—Hand or other personal actuation
- B61H13/04—Hand or other personal actuation by mechanisms incorporating toothed gearing
Definitions
- the invention relates generally to railroad cars and, more particularly to an apparatus and method for releasing a railroad car handbrake.
- the main brake system is an airbrake system.
- an air brake is a conveyance braking system actuated by compressed air.
- Modern trains rely upon a fail-safe air brake system that is based upon a design patented by George Westinghouse on March 5, 1872. In various forms, it has been nearly universally adopted.
- the Westinghouse system uses air pressure to charge air reservoirs (tanks) on each car. Full air pressure signals each car to release the brakes. A reduction or loss of air pressure signals each car to apply its brakes, using the compressed air in its reservoirs.
- the second type of brake employed on a railcar is a manual hand brake assembly that usually includes a relatively large, rotatable hand wheel disposed in a vertical plane and mounted on a shaft which, through a gear train, can rotate a chain drum to wind up a chain that is secured at its end remote from the chain drum to the brake rigging of the railway car.
- a manual hand brake assembly usually includes a relatively large, rotatable hand wheel disposed in a vertical plane and mounted on a shaft which, through a gear train, can rotate a chain drum to wind up a chain that is secured at its end remote from the chain drum to the brake rigging of the railway car.
- the hand brake usually includes a release lever that disengages the holding pawl so that the hand wheel shaft rotates in the opposite direction to disengage the brakes.
- Each railroad car employs one hand brake at one end of the car or two hand brakes, with one at each end of the car.
- Horvath discloses a system that operates off the main air brake pressure lines to automatically release the hand brakes when the air pressure of the train is brought up to a certain level.
- the disclosed system is a "add on” system and is not a fully integrated automated hand brake. The system still requires a manual reset and requires the presence of a release lever.
- an automatic hand brake system for a railcar that comprises a release mechanism operatively connected between an actuator and the spool gear that is turned by hand to set the hand brake.
- the actuator is operatively connected to a pressured fluid system.
- a threshold pressure When a threshold pressure is reached the actuator operates the release mechanism to release the spool gear so that the brakes are released.
- an automatic reset apparatus When there is a pressure drop, an automatic reset apparatus resets the release mechanism so that the hand brake can set.
- the pressurized fluid system is an air brake system.
- the pressurized fluid system is oil or hydraulic system or a combination of air and oil.
- a manual lever can be employed to allow manual release of the hand brake if desired.
- all of the operative elements of the release mechanism are contained in the hand brake housing.
- the release mechanism is actuated at a fluid system pressure of less than about 70 psi.
- the release mechanism is actuated at a fluid system pressure of about 30 psi to about 50 psi.
- the mechanism incorporates a permissive that permits the operator of the train, for example the engineer, to allow the release all the hand brakes on all the cars at one time.
- Fig. 1 is a front elevational view of a railcar hand brake employing the automatic release mechanism of the present invention
- Fig. 2 is a rear elevational view thereof;
- Fig. 3 is a side elevational view thereof
- Fig. 4 is a diagram of an aspect of a permissive system of the present invention.
- Fig. 5 is schematic of other aspects of the permissive system of the present invention.
- the automatic brake release system is designed for the automatic releasing of all hand brakes of a railroad car system.
- the hand brake can employ many of the internal components of a standard hand brake. Representative internal components are disclosed in U.S. Patent No. 5,469,941 to Horvath, Patent No. 6,364,428 to Labriola et al and in Kanjo's U.S. Application No. 2008/0223669, all of which are incorporated herein by reference.
- the automatic brake release system can be based on a vertical wheel hand brake or can be employed in other in other types of hand brake systems such as double sided, release and hold and lever type hand brakes.
- the hand brake system of the present invention requires only one fluid flow line to operate.
- the brake system can optionally include a hand lever to manually disengage the brake as well.
- the release mechanism is powered from a pressurized fluid source, such as the main air brake pressure lines of the railcars.
- a pressurized fluid source such as the main air brake pressure lines of the railcars.
- other pressurized fluid systems such as hydraulic systems or a combination of hydraulic and air can be used.
- the pressure built up in the lines is used to release the railcar brake by energizing an air cylinder inside the hand brake.
- the air cylinder actuates the release mechanism to release the hand brake.
- pressure is removed, for example, if the pressure in the air brake pressure lines drops, the release mechanism is returned automatically to the initial position where an operator can turn the wheel or crank the lever to apply the hand brake.
- a check valve can be engaged to drop the pressure in the system.
- Hand brake system 10 includes a housing 12 having a front wall 14 and a back wall 16. Back wall 1 6 is constructed so as to be mounted on the railcar, preferably at one end or the other. A railcar may employ one or two hand brake systems. In any event, it will be appreciated that most of the operative elements of the hand brake system are contained within housing 1 2 to protect the system from dirt, debris and weather.
- Hand brake system 10 includes a brake hand wheel 29 positioned on the outside of front wall 14 of housing 12. Hand wheel 29 is attached to one end of a shaft 30. Shaft 30 is appropriately journaled in bearings so as to be rotatably mounted within the housing.
- an automatic brake release mechanism inside the housing comprising a ratchet and pawl mechanism 40, pivot mechanism 42 and an actuator which, in the illustrated embodiment, is a cylinder 44.
- One end of cylinder 44 is secured in the housing by bracket 46.
- Bracket 46 There is a cylinder shaft 48 that can move axially within the cylinder.
- Shaft 48 has a bracket 50 it is exposed end.
- Cylinder 44 includes an automatic cylinder return 51 , the function of which will be described in greater detail below. In any event, automatic cylinder return 51 can be spring loaded, fluid actuated or any acceptable design.
- Pivot mechanism 42 includes an arm 52 having a first end 54 pivotally attached to bracket 50. The opposite end of arm 52 is pivotally attached to a shaft 56 that extend through front wall 14 of the housing. There is a detent 57 on arm 52 adjacent the attachment to shaft 56.
- Ratchet mechanism 40 has gear 58 with peripheral, unidirectional teeth
- Gear 58 is attached to shaft 30 so as to rotate with the shaft when hand wheel 29 is turned.
- a clutch assembly 62 is associated with gear 58 and includes a detent seat 64 to engage and seat detent 56 when the ratchet mechanism is engaged.
- Clutch assembly includes pinion 66 that operatively engages a chain spool gear 68 for rotating chain drum 70.
- gear 58 drives pinion 66, which engages chain spool gear 68 to turn in one direction so as to apply the hand brakes through a chain 72.
- chain 72 is operatively associated with breaks on the railcar wheels.
- Detent 57 also keeps spool gear 68 from unwinding chain when the pivot arm is in a first position and the brakes are set. This relationship is shown in solid lines in Fig. 1 . When the pivot arm is urged to a second position, as illustrated in dotted lines in Fig. 1 , detent 57 is disengaged which lets gear 58 to free wheel.
- cylinder 44 actuates release by the extension of cylinder shaft 48, it will be understood that withdrawal of the shaft could cause actuation of the system. Similarly, orientation of the actuator itself, in this case cylinder 44, whether it is disposed horizontally or vertical, is incidental to the invention.
- Cylinder 44 is operatively attached to a source of pressurized fluid, for example a main reservoir 73, through an air brake line 74, as seen in Fig. 4.
- a source of pressurized fluid for example a main reservoir 73
- cylinder shaft 48 actuates the pivot mechanism 42, as shown in dotted lines in Fig. 1 , to release the hand brake.
- the pressure level required to release the brakes is relatively low, about 30 and about 50 psi, which is well below the maximum 70 psi that railcar air system generally employs.
- automatic cylinder return 51 urges the pivot arm back to the engaged position so that the hand brakes can be set by turning hand wheel. This feature of the invention eliminates the need for a brakeman to manipulate the hand brake system before setting the hand brake.
- cylinder 44 only requires about 20.8 cubic inches of volume when actuated.
- the automatic hand brake only adds minimal time to pressurize railcar air system, for example, because the automatic hand brake uses minimal volume of air from the railcar brake system.
- the volume can be reduced by keeping the airlines connected from the railcar to the hand brake to a minimal diameter size and minimal length.
- the hand brake can also be operated manually.
- the system may include an optional release lever 75.
- Lever 75 is positioned outside the housing and operatively associated with shaft 56 of the pivot mechanism. However, lever 75 is generally biased out of engagement with shaft 56. The brakeman pushes lever 75 inward so that the lever engages shaft 56 so that the brakes can be released by rotating and actuating the lever.
- the automatic hand brake system may include an air filter to prevent contamination of the cylinder. It also includes a manual valve 76, which will be described below, that can isolate the automatic brake release mechanism from the source of pressurized fluid so that it can be operated manually.
- the mechanism employs apparatus to permit the an operator, such as the engineer located at a remote location from the train cars, for example in the locomotive, to provide a permissive to allow release all of the hand brakes at one time.
- One embodiment comprises a plurality of pneumatic valves and associate components in line with the automatic release hand brake that measure the change of air pressure over a period of time.
- a permissive system is illustrated in Figs. 4 and 5. As discussed above, cylinder 44 is connected to reservoir 73 by line 74.
- Manual valve 76 which can be a diverting, 3 port ball valve located on the side of the rail car, can be manipulated to place the system in a manual or automatic mode of action.
- pneumatic valve assembly 78 that is normally closed.
- pneumatic valve assembly 78 which can measure and respond to a permissive signal or pneumatic logic, generally comprising a predetermined change in fluid pressure over a predetermine period of time, which allows the brake to be released.
- Valve 78 senses the permissive signal from the locomotive (or other site) and allows the hand brake to release.
- the permissive signal can be a sequence of changes in fluid pressure over a given period of time.
- the permissive signal is given by the locomotive engineer through fluid pressure to the main line that runs through all the rail cars so that all of the rail car brake systems have the same amount of change of pressure in a given amount of time, permitting release of all the hand brake systems at the same time.
- mechanism of the present invention can employ apparatus to release the hand brakes from any remote location, particularly a location that has a source of fluid under pressure.
- the apparatus can employ changes in air pressure, other fluid pressure, electronic signals, remotely operated valves, manual overrides or any other apparatus that can allow release of the hand brake from a location other than the train car.
- the system can be computer controlled and actuated as well.
- the source of pressurized fluid is air.
- any type of fluid may be used to actuate the mechanism, including air, hydraulic oil, combinations of air and oil or any other fluid.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Braking Arrangements (AREA)
- Regulating Braking Force (AREA)
Abstract
La présente invention concerne un système de frein à main automatique pour un wagon qui comprend un mécanisme de libération connecté de façon opérationnelle entre un actionneur et le pignon à enroulement qui est tourné manuellement pour serrer le frein à main. L'actionneur est raccordé de façon opérationnelle à un système fluidique sous pression. Lorsqu'une pression seuil est atteinte, l'actionneur fait fonctionner le mécanisme de libération pour libérer le pignon à enroulement de sorte que les freins soient desserrés. En cas de chute de pression, un appareil de réinitialisation automatique réinitialise le mécanisme de libération de sorte que le frein à main puisse être serré. Dans un aspect, le système fluidique sous pression est tel qu'un système de frein pneumatique. Dans un autre aspect, le système fluidique sous pression est un système à huile ou hydraulique ou une association d'air et d'huile. Un appareil peut être utilisé pour permettre de desserrer le frein à main, le cas échéant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/883,533 US20140332328A1 (en) | 2010-11-05 | 2011-11-04 | Railroad car hand brake release system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41045710P | 2010-11-05 | 2010-11-05 | |
US61/410,457 | 2010-11-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2012061671A2 true WO2012061671A2 (fr) | 2012-05-10 |
WO2012061671A3 WO2012061671A3 (fr) | 2012-08-16 |
Family
ID=46025125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2011/059261 WO2012061671A2 (fr) | 2010-11-05 | 2011-11-04 | Système de libération de frein à main d'un wagon de chemin de fer |
Country Status (2)
Country | Link |
---|---|
US (1) | US20140332328A1 (fr) |
WO (1) | WO2012061671A2 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2583403A (en) * | 2020-02-14 | 2020-10-28 | Lancereal Ltd | A brake assembly |
US11042566B2 (en) | 2014-02-19 | 2021-06-22 | Snowflake Inc. | Cloning catalog objects |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9758136B2 (en) * | 2015-01-14 | 2017-09-12 | New York Air Brake, LLC | Integrated system for a powered handbrake on a locomotive |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5469941A (en) * | 1994-02-07 | 1995-11-28 | James T. Williamson | Automatic handbrake release system for a railroad car |
US6179093B1 (en) * | 1998-09-18 | 2001-01-30 | Westinghouse Air Brake Company | Power source activated handbrake release mechanism |
US6789855B2 (en) * | 2002-09-17 | 2004-09-14 | Westinghouse Air Brake Technologies Corporation | Automatic set and release hand brake |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0542863A (ja) * | 1991-08-13 | 1993-02-23 | Akebono Brake Ind Co Ltd | ブレーキ制御装置 |
US6578679B2 (en) * | 2000-04-04 | 2003-06-17 | Utd Incorporated | Brake system and method |
US6709068B2 (en) * | 2001-08-17 | 2004-03-23 | Westinghouse Air Brake Technologies Corporation | Automatic set and release hand brake pneumatic circuit design II/automatic application function |
US7156471B2 (en) * | 2004-10-28 | 2007-01-02 | Wabtec Holding Corp. | Two-stage cylinder for applying automatic set and release hand brake |
US8794717B2 (en) * | 2009-11-10 | 2014-08-05 | New York Air Brake Corporation | Automatic release hand brake control system |
-
2011
- 2011-11-04 WO PCT/US2011/059261 patent/WO2012061671A2/fr active Application Filing
- 2011-11-04 US US13/883,533 patent/US20140332328A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5469941A (en) * | 1994-02-07 | 1995-11-28 | James T. Williamson | Automatic handbrake release system for a railroad car |
US6179093B1 (en) * | 1998-09-18 | 2001-01-30 | Westinghouse Air Brake Company | Power source activated handbrake release mechanism |
US6789855B2 (en) * | 2002-09-17 | 2004-09-14 | Westinghouse Air Brake Technologies Corporation | Automatic set and release hand brake |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11042566B2 (en) | 2014-02-19 | 2021-06-22 | Snowflake Inc. | Cloning catalog objects |
US11928129B1 (en) | 2014-02-19 | 2024-03-12 | Snowflake Inc. | Cloning catalog objects |
GB2583403A (en) * | 2020-02-14 | 2020-10-28 | Lancereal Ltd | A brake assembly |
GB2583403B (en) * | 2020-02-14 | 2021-08-18 | Lancereal Ltd | A brake assembly for a rail vehicle |
Also Published As
Publication number | Publication date |
---|---|
WO2012061671A3 (fr) | 2012-08-16 |
US20140332328A1 (en) | 2014-11-13 |
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