US3799064A - Retractable buffer stop - Google Patents

Retractable buffer stop Download PDF

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Publication number
US3799064A
US3799064A US00326390A US32639073A US3799064A US 3799064 A US3799064 A US 3799064A US 00326390 A US00326390 A US 00326390A US 32639073 A US32639073 A US 32639073A US 3799064 A US3799064 A US 3799064A
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US
United States
Prior art keywords
actuating arm
buffer stop
impact
car
impact head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00326390A
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English (en)
Inventor
H Kobayashi
T Kamei
T Kikuchi
T Motoki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan National Railways
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Japan National Railways
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan National Railways filed Critical Japan National Railways
Application granted granted Critical
Publication of US3799064A publication Critical patent/US3799064A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K7/00—Railway stops fixed to permanent way; Track brakes or retarding apparatus fixed to permanent way; Sand tracks or the like
    • B61K7/16—Positive railway stops
    • B61K7/18—Buffer stops

Definitions

  • the buffer stop generally comprises an actuating arm, a pair of supporting arms and a hydraulic power cylinder which serves to raise or lower the actuating arm. They are so interconnected as to form a straight-line mechanism in order to permit an impact head pivoted to the upper end of the actuating arm to make a straight linear motion in the horizontal direction when the car strikes against the buffer stop.
  • the impact head is also coupled through a parallel linkage to the pivot pin at the lower end of the actuating arm so that the impact receiving surface of the impact head may be always maintained vertically.
  • a hydraulic shock absorber is also provided to absorb the impact from the car. Since the impact head may make a straight linear motion in the horizontal direction and its impact receiving surface may be always maintained vertically the impact forces from the car may be uniformly distributed over the retractable buffer stop.
  • the present invention relates to generally a retractable buffer stop for retarding and stopping a freight car or the like or permitting it to pass over it freely, and more particularly retractable buffer stops adapted to be installed in a freight car classification yard in order to sort and stop the frieght cars released from a switch engine or hump.
  • the buffer stops In the mines and railroad yards the cars must be stopped at a predetermined position. Since the cars are moving at a certain speed the considerable impact forces are exerted to the buffer stops or the like. Therefore the buffer stops must be robust in construction yet compact in size and reliable and dependable in operation.
  • the conventional buffer stops may be divided generally into two types.
  • an elastic buffer means which is directly or indirectly mounted on an impact receiving member of the buffer stop absorbs the impact forces from the moving car so as to stop it at a predetermined position.
  • an actuating arm against the upper end of which strikes the coupling or the like of a moving car is coupled to a hydraulic shock absorber and to a hydraulic power cylinder which serves to raise or lower the actuating arm so that the impact forces exerted to the buffer stop may be absorbed by the hydraulic shock absorber when the moving car is stopped at a predetermined position.
  • the elastic member In the former type the elastic member must be made considerably large in size in order to sufficiently absorb the great impact forces exerted from the moving car so that the buffer stop becomes considerably large in size.
  • the buffer stop may be made compact in size, but it has a defect that the point of the actuating arm at which the coupling of a car engages with the actuating arm is gradually shifted as the actuating arm swings about its pivot pin. Therefore the excessive impact forces are exerted to the actuating arm so that its pivot pin is susceptible to damage within a relatively short operational time. In the worst case the runaway happens.
  • One of the objects of the present invention is therefore to provide a linkage type retractable buffer stop in which the upper end of an actuating member against which the coupling of a moving car strikes may make a straight linear horizontal motion so that no excessive impact forces may be exerted to the actuating arm when the car is retarded and stopped.
  • an impact head against which strikes the coupling of a moving car is pivotably fixed to the upper end of an actuating arm having at a suitable point between its ends pivotably fixed to a pair of supporting arms which in turn are pivotably fixed to a stationary member such as a side wall in a pit between a pair of rails, the lower end of the actuating arm being pivotably fixed to the piston of a hydraulic actuating cylinder which in turn is pivotably fixed to a stationary member and serves to raise or lower the actuating arm.
  • a hydraulic shock absorber is interposed between the actuating arm and a stationary member or side wall in the pit so that the impact forces exerted from the moving car to the actuating arm may be absorbed.
  • the upper end of the actuating arm and hence the impact head may make a straight linear horizontal motion.
  • the impact head pivoted to the upper end of the actuating arm is coupled through a parallel linkage to the pivot pin with which the lower end of the actuating arm is pivotably fixed to the piston rod of the hydraulic actuating cylinder so that the impact receiving surface of the impact head may be always maintained vertically regardless of the swinging motion of the actuating arm.
  • the impact head When the coupling of a moving car strikes against the impact head at the upper end of the actuating arm of the retractable buffer stop in accordance with the present invention, the impact head may make a straight linear horizontal motion while the impact receiving surface thereof may be maintained vertically so that the impact forces may be uniformly distributed over the impact receiving surface of the impact head. Therefore no excessive impact force will be exerted to any component parts of the retractable buffer stop in accordance with the present invention and the cars may be retarded and stopped in a very efficient manner.
  • the present invention may provide a retractable retarder which is compact in size and very reliable and dependable in operation and has a long service life.
  • FIG. 1 is a front view of a retractable buffer stop in accordance with the present invention illustrating in the operative position for stopping or retarding a freight car;
  • FIG. 2 is a side view thereof
  • FIG. 3 is a top view thereof.
  • FIG. 4 is a front view thereof illustrating the retracted position.
  • retractable buffer stop in accordance with the present invention will be described as being installed in a freight car classification yard, but it is to be understood that the retractable buffer stops in accordance with the present invention may be utilized for various purposes in the railroad system.
  • a retractable buffer stop generally indicated by 10 is installed within a pit 16 between a pair of rails 14 on which rides a freight car 12.
  • the buffer stop 10 generally comprises an actuating arm 18 located in the deep pit portion 16a, a hydraulic shock absorber 20 installed in the shallow pit portion 16b and operatively coupled to the actuating arm 18 as will be described in more detail hereinafter, a pair of supporting arms 22, and an actuating cylinder 24 located in the deep pit portion 160.
  • the hydraulic shock absorber is of the conventional horizontal type having a piston rod 26 which is normally extended.
  • the base of the hydraulic shock absorber 20 is securely fixed to the side wall 28 in the shallow pit portion 16b.
  • To the free end of the piston rod 26 is pivoted the base end of a connecting rod 32 with a pin or shaft 30 for vertically angular movement.
  • the other end of the connecting rod 32 is pivoted with a pin or shaft 34 to the actuating arm 18 for vertically angular movement.
  • Each of the supporting arms 22 is pivoted with a shaft or pin to a bracket 38 installed in a recess 36 formed in each side wall of the pit 16 as best shown in FIG. 2.
  • the supporting arms 22 are also pivoted to the actuating arm 18 with the shaft or pin 34. Therefore the actuating arm 18 is partly supported by the supporting arms 22 and the connecting rod 32 extending from the hydraulic shock absorber 20.
  • the base of the actuating cylinder 24 is pivoted to a bracket 44 which in turn is securely fixed to the side wall42 of the deep pit portion 16a which defines the boundary between the deep and shallow pit portions 160 and 16b.
  • the free end of a piston rod extending from a piston 48 mounted within the actuating cylinder 24 is pivoted with a shaft or pin 52 to the lower end of the actuating arm 18.
  • the actuating arm 18, the pair of supporting arms 22, and the hydraulic power cylinder 24 form a straight-line mechanism so that the upper end of the actuating arm 18 may make a straight linear motion in the horizontal direction as indicated by the chain lines in FIG. 1 when the coupling 86 or the like of the freight car 12 strikes against the actuating arm 18. Therefore the engagement of the coupling 86 of the freight car I2 with the actuating arm 18 will remain unchanged in position when the car 12 is retarded and stopped.
  • the working oil under pressure is forced into the actuating cylinder 24 through ports 54 and 56, the former being normally communicated with a source of working oil under pressure. Therefore the working oil under pressure is normally supplied into the left chamber 58 in the actuating cylinder 24 so that the piston rod 50 is locked in the retracted position.
  • the right port 56 is selectively communicated with the working oil or high pressure source or a sump through a switching valve (not shown). The port 56 is normally communicated with the sump so that the piston rod 50 is locked in the retracted position so that the actuating arm 18 may be held in the raised position as shown in FIG. 1.
  • an impact head 64 for vertically angular movement, and it comprises, as best shown in FIG. 3, a box-shaped member having a hole 68 opened at the forward end thereof, a head member 72 which is slidably disposed within the box-shaped member 70,.
  • shock absorber 74 is shown as being a spring, but it is to be understood that any other suitable shock absorbing material such as rubber or the like may be employed.
  • crank rods 74 and 76 On each side of the actuating arm 18 is disposed a parallel linkage comprising crank rods 74 and 76, a connecting rod 84 having a telescopic tube having a spring loaded therein and a turnbuckle 82 and the actuating arm 18.
  • One ends of the crank rods 74 and 76 are fixed to the pins 62 and 52 respectively whereas the other ends are fixed to the upper and lower ends of the connecting rod 84, respectively.
  • the impact receiving surface of the impact head 64 may be always maintained vertically regardless of the swinging motion of the actuating arm 18, and the slight inclination of the impact receiving surface of the impact head 64 relative to the vertical line caused by the swinging motion of the actuating cylinder 24 about the pivot pin 46 may be compensated by the telescopic tube 80 of the connecting rod 84. Therefore the impact receiving surface of the impact head 64 may be always maintained vertically.
  • the coupling 86 of the car 12 engages with the impact head 64 and pushes it backwardly, that is, to the left in FIG. 1. Since the actuating cylinder 24 is locked as described before the actuating arm 18 makes a swinging motion which is the the resultant swinging motion of the first and second swinging motions described above but the impact head 64 at the upper end of the actuating arm 18 makes a straight linear horizontal motion.
  • the impact receiving surface of the impact head 64 may be maintained vertically regardless of the swinging motion of the actuating arm 18 in the manner described hereinbefore so that the reliable and dependable engagement of the coupling 86 of the freight car 12 with the impact head 64 may be ensured and the impact force may be uniformly exerted to the impact head 64.
  • the actuating arm 18 swings in the manner described above due to the impact exerted thereto from the car 12, the impact and the kinetic energy of the car 12 are gradually absorbed by the hydraulic shock absorber 20 as the connecting rod 32 and hence the piston rod 26 travel to the right.
  • the car 12 may be retarded and stopped at a predetermined position.
  • the impact head 64 at the upper end of the actuating arm 18 of the retractable buffer stop may make a straight linear horizontalmotion of the actuating arm 18 while the impact receiving surface of the impact head 64 may be always maintained vertically. Therefore no excessive forces are exerted not only to the coupling 86 of the car 12 but also to the component parts of the retractable buffer stop 10.
  • the retractable buffer stop in accordance with the present invention may be made compact in size and light in weight.
  • a retractable buffer stop comprising a. an actuating arm (with the upper end of which strikes a coupling or the like of a car),
  • a hydraulic shock absorber interposed between said point of said actuating arm and a stationary member for providing the retarding or braking force when the car strikes the retractable buffer stop
  • said actuating arm, said pair of supporting arms and said connecting member being so interconnected with each other as to form a straight-line mechanism so that the upper end of said actuating arm may make a straight linear motion in the horizontal direction when the car strikes against said upper end of said actuating arm.
  • a retractable buffer stop as defined in claim 4 wherein said parallel linkage comprises a crank rod having one end thereof fixed to said pivot pin of said impact head, a crank rod having one end thereof fixed to said pivot pin at the lower end of said actuating arm, a connecting rod pivoted to the other ends of said two crank rods, said connecting rod having a telescopic tube portion disposed at a suitable point between the ends thereof.
  • a head member slidably fitted into said box-shaped member, and an initial load absorbing means interposed between said head member and said boxshaped member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
US00326390A 1972-01-25 1973-01-24 Retractable buffer stop Expired - Lifetime US3799064A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47009377A JPS5249205B2 (zh) 1972-01-25 1972-01-25

Publications (1)

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US3799064A true US3799064A (en) 1974-03-26

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US00326390A Expired - Lifetime US3799064A (en) 1972-01-25 1973-01-24 Retractable buffer stop

Country Status (5)

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US (1) US3799064A (zh)
JP (1) JPS5249205B2 (zh)
DE (1) DE2303605C3 (zh)
FR (1) FR2169252B1 (zh)
GB (1) GB1367864A (zh)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034677A (en) * 1975-09-22 1977-07-12 Abex Corporation Railroad classification yards
US4108079A (en) * 1976-11-24 1978-08-22 Georgia Tech Research Institute Releasable stop for a vehicle moving through a conduit
US4407484A (en) * 1981-11-16 1983-10-04 Meinco Mfg. Co. Impact energy absorber
US4572080A (en) * 1983-03-18 1986-02-25 Oleo International Holdings Limited Movable stops for railway vehicles
US4610207A (en) * 1983-12-13 1986-09-09 Georg Uttscheid Positioning device for the trolleys of an electric overhead trolley conveyor
US5104064A (en) * 1990-07-02 1992-04-14 The United States Of America As Represented By The Secretary Of The Air Force Pallet end stop
US20090224101A1 (en) * 2005-08-11 2009-09-10 Airbus Deutschland Gmbh Securing device for a load system in a cargo compartment of an aircraft, comprising at least one securing catch
US20150007743A1 (en) * 2010-03-26 2015-01-08 Aaa Sales & Engineering, Inc. Devices, systems and methods for engaging and disengaging railcar wheels and for controlling travel of railcar
US20150211197A1 (en) * 2012-08-09 2015-07-30 Michael Rossmann Method and device for braking a vehicle which has gone out of control
CN105172836A (zh) * 2015-08-25 2015-12-23 山西晋城无烟煤矿业集团有限责任公司 矿用轨枕式远控阻车器
CN106184280A (zh) * 2016-08-14 2016-12-07 哈尔滨热电有限责任公司 迁车台二级缓冲高位止挡器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325307A (en) * 1979-05-25 1982-04-20 Dowty Hydraulic Units Limited Buffer stop
DE2932775A1 (de) * 1979-08-13 1981-02-26 Erhart Dr Wilisch Prellbock, insbesondere als spitzensicherung im rangierbahnhof
DE3129368A1 (de) * 1981-07-25 1983-02-10 FAG Kugelfischer Georg Schäfer & Co, 8720 Schweinfurt Einrichtung mit einem schwenkbaren prellbock fuer daszusammenstellen von zuegen aus gleisgebundenen wagen
ATE13998T1 (de) * 1981-12-29 1985-07-15 Windhoff Rheiner Maschf Prellbock fuer gleisanlagen.
DE3151795A1 (de) * 1981-12-29 1983-07-14 Rheiner Maschinenfabrik Windhoff Ag, 4440 Rheine "prellbock fuer gleisanlagen"
DE3734068A1 (de) * 1986-10-08 1988-04-14 Fraunhofer Ges Forschung Schienengebundenes transportsystem

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB699937A (en) * 1951-10-02 1953-11-18 W G Allen And Sons Tipton Ltd Improvements in stops for railroad vehicles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE924089C (de) * 1953-10-29 1955-02-24 Gutehoffnungshuette Sterkrade Auffangvorrichtung fuer Schienenfahrzeuge, insbesondere Bergbaufoerderwagen
GB827587A (en) * 1955-04-07 1960-02-10 Frederick Gilbert Mitchell Improvements in or relating to railway buffer stops

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB699937A (en) * 1951-10-02 1953-11-18 W G Allen And Sons Tipton Ltd Improvements in stops for railroad vehicles

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034677A (en) * 1975-09-22 1977-07-12 Abex Corporation Railroad classification yards
US4108079A (en) * 1976-11-24 1978-08-22 Georgia Tech Research Institute Releasable stop for a vehicle moving through a conduit
US4407484A (en) * 1981-11-16 1983-10-04 Meinco Mfg. Co. Impact energy absorber
US4572080A (en) * 1983-03-18 1986-02-25 Oleo International Holdings Limited Movable stops for railway vehicles
US4610207A (en) * 1983-12-13 1986-09-09 Georg Uttscheid Positioning device for the trolleys of an electric overhead trolley conveyor
US5104064A (en) * 1990-07-02 1992-04-14 The United States Of America As Represented By The Secretary Of The Air Force Pallet end stop
US20090224101A1 (en) * 2005-08-11 2009-09-10 Airbus Deutschland Gmbh Securing device for a load system in a cargo compartment of an aircraft, comprising at least one securing catch
US8152206B2 (en) * 2005-08-11 2012-04-10 Airbus Operations Gmbh Securing device for a load system in a cargo compartment of an aircraft, comprising at least one securing catch
US20150007743A1 (en) * 2010-03-26 2015-01-08 Aaa Sales & Engineering, Inc. Devices, systems and methods for engaging and disengaging railcar wheels and for controlling travel of railcar
US9260120B2 (en) * 2010-03-26 2016-02-16 Precision Rail And Mfg., Inc. Devices, systems and methods for engaging and disengaging railcar wheels and for controlling travel of railcar
US20150211197A1 (en) * 2012-08-09 2015-07-30 Michael Rossmann Method and device for braking a vehicle which has gone out of control
US9371620B2 (en) * 2012-08-09 2016-06-21 Thomas Mulert Method and device for braking a vehicle which has gone out of control
CN105172836A (zh) * 2015-08-25 2015-12-23 山西晋城无烟煤矿业集团有限责任公司 矿用轨枕式远控阻车器
CN105172836B (zh) * 2015-08-25 2018-06-12 山西晋城无烟煤矿业集团有限责任公司 矿用轨枕式远控阻车器
CN106184280A (zh) * 2016-08-14 2016-12-07 哈尔滨热电有限责任公司 迁车台二级缓冲高位止挡器

Also Published As

Publication number Publication date
FR2169252A1 (zh) 1973-09-07
GB1367864A (en) 1974-09-25
DE2303605A1 (de) 1973-08-02
FR2169252B1 (zh) 1977-04-22
JPS4878605A (zh) 1973-10-22
JPS5249205B2 (zh) 1977-12-15
DE2303605C3 (de) 1980-11-13
DE2303605B2 (de) 1980-03-20

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