US2872878A - Track tamping machine - Google Patents

Track tamping machine Download PDF

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Publication number
US2872878A
US2872878A US629183A US62918356A US2872878A US 2872878 A US2872878 A US 2872878A US 629183 A US629183 A US 629183A US 62918356 A US62918356 A US 62918356A US 2872878 A US2872878 A US 2872878A
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Prior art keywords
tamping
pressure
tools
piston
cylinder
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Expired - Lifetime
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US629183A
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English (en)
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Plasser Franz
Theurer Josef
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/12—Packing sleepers, with or without concurrent work on the track; Compacting track-carrying ballast
    • E01B27/13—Packing sleepers, with or without concurrent work on the track
    • E01B27/16—Sleeper-tamping machines

Definitions

  • the present invention relates to ballast tamping machines comprising preferably vibratory pairs of tamping tools arranged to tamp the ballast underneath railroad ties between pairs of tools which are pressed together. More particularly, it concerns a mechanism for adjusting the opening width of tamping tool pairs.
  • Such track tamping machines comprise pairs of cooperating tamping tools mounted on a vertically movable carrier and means for varying the distance between the tamping tools of each pair. ⁇
  • the ballast is packed under a tie by placing the lower ends of the tamping tools of each pair into the ballastrat each side of the tie and forcing the tamping tools together while preferably vibrating them simultaneously.
  • ballast tamping machine with cooperating pairs of tamping tools so that the machine may be operated continuously and without time-consuming interruptions to tamp successive ties of dilerent width, for instance double ties positioned under rail joints.
  • vIt is another object of the invention to control the maximal pressure exerted upon the closing tamping tools automatically when their opening distance is adjusted to accommodate ties of different width.
  • adjustable limit stop means for controlling the opening width of the tamping tool pairs according to the width of the tie to be tamped.
  • the invention provides adjustable limit stops which are engageable directly by said elements and which delimit the outward movement of said elements and, accordingly, the opening width of the tamping tools.
  • the invention is applied to the machine disclosed in our prior application Serial No. 462,086, wherein each tamping tool is linked with a cylinder which is slidably mounted on a fixed piston rod carried by the tamping tool carrier.
  • a piston is arranged on the piston rod in each cylinder and, by applying a pressure fluid to one or the other cylinder chamber, the cylinder is moved on the rod and thereby moves the tamping tool linked with it.
  • the limit stop means include a fixed stop mounted on the piston rod to limit the farthest outward movement of each cylinder and its associated tamping tool, thereby establishing the widest opening width of the cooperating tamping tools, and movable stops arranged to be moved into and out of engagement with the piston rod between each cylinder and its associated iixed stop, establishing a narrowed opening width when the movable stops engage the piston rod.
  • the adjustment of the movable stops controls not only the opening width of the tamping tools but automatically changes the maximal pressure which may be exerted by the tamping tools during their closing (tamping) movement.
  • Fig. 1 is a schematic side view of a mobile track tamping machine, showing the tamping tool opening and closing means in section;
  • Fig. 2 illustratesv the arrangement according to the invention for controlling the mechanism which limits the opening width of the tamping tools
  • Fig. 3 is the perspective view of the tamping tool carrier with the mechanism of the invention shown in conjunction with a single tamping tool, for claritys sake, identical movable stop means being provided for each tool.
  • a mobile truck mounting the frame 1 and two support columns on which th'elvertically adjustable tamping tool carrier 2 is glidablysupported.
  • the upper ends of each cooperating pair of tamping tools 3 are linked to mounting arms 4 which are vibrated by cam shaft 5.
  • the means for varying the distance between the tools of each pair comprise pistons 6 mounted on piston rods 7 which are tixedly journaled in the tamping tool carrier, the pistons gliding in closed cylinders 8 which are movably mounted on the piston rods.
  • the tamping tools 3 are substantially centrally linked at 9 with the movable cylinders.
  • the central block 10 serves to removably retain the piston rods 7 in coaxial position.
  • Pressure fluid conduits 11 and 11 are arranged to sup-y ply pressure uid to cylinder chambers S and 8", respectively.
  • pressure uid i. e. oil
  • the built-up pressure in chambers 8" willforce cylinders 8 and associated tamping tools 3'to move inwardly, i. e. the tamping tools will be closed into tamping action.
  • pressure fluid for instance compressed air, may be supplied to chambers 8' through conduits 11.
  • Fixed limit stops 12 are mounted at the outer ends of the piston rods to limit the outermost position of cylinders 8 and thus to determine the largest opening width of the tamping tools.
  • Movable stops 13 are mounted on the tamping tool carrier for movement adjacent the xed limit stops, the movable stops being positonable on the piston rods between cylinders 8 and limit stops 12. When the movable stops are thus positioned and the cylinders are pressed outwardly, the xed limit stops 12 will support the movable stops against the lateral pressure exerted upon them by the cylinders.
  • the movable stops have the width s. Therefore, when they are removed from the piston rods 7, the outward path of each cylinder S is increased by the distance s and the opening width of the tamping tools is increased by 2s.
  • the position of fixed limit stops 12 is chosen so that the distance of the fully opened tamping tools 3 is suiicient to tamp double ties 40 when cylinders 8 contact the limit stops.
  • the width of movable stops 13 is such that, when they are in position on the piston rods, they will limit the outward movement of the tamping tools to an opening width suilicient for tamping the normal ties 39.
  • each movable stop- 13 comprises bell crank lever 14, pivotable about axle 16 which is journaled in the tamping tool carrier 2.
  • ArmY 1e carries the semi-circular stop portion 13 which is adapted to engage piston rod 7 when the bell crank lever is pivoted into position I to limit the path of cylinder 8 on rod 7.
  • To eiect the pivoting movement of the bell crank lever, its arm 15 is linked to rod 17 which is actuatable by movement of piston 18 in cylinder 19.
  • the stop 13 is held in engaging position I (full lines in Fig.
  • Relief pressure valve 24 comprises spring 27 which is biased to determine the maximal pressure, one end of the spring pressing against the valve closure element, i. e. ball 25, while its other end presses against a piston rodAV carrying piston 26 glidably mounted in cylinder 31. The position of the piston will determine the pressure exerted by spring 27 on valve closure element 25.
  • the valve also includes an adjustment screw 28 which permits control of the bias of spring 27 and thus of the pressure to which the valve will respond when piston 26 is not under the inuence of pressure fluid supplied through conduit 23, i.- e. when ties 39 of normal width are tamped.
  • the path of piston 26 in cylinder 31 is limited by stop 32 so that, even when the cylinder chamber is filled to capacity with pressure tluid, the pressure exerted on valve spring 27 cannot exceed a predetermined magnitude.
  • cylinder 19, which serves to move stops 13, and cylinder 31, which determines the action of relief pressure valve 24, are supplied by the same pressure fluid conduit 22.
  • the supply of pressure fluid to these cylinders is so controlled that it eiects not ⁇ only the movement of stops 13 to position 1I to allow wider opening of the tamping tools but simultaneously increases the pressure of spring 27 in valve 24, thus increasing the maximal pressure which may be exerted by the closing movement of the tools.
  • the valve is connected in the uid pressure conduit 11 through branch conduit and, when excess pressure occurs, fluid will be conducted from conduit 11 through branch conduit 3h and outlet conduit 29 into a storage container (not shown),
  • the control of pressure uid supply to conduit 22, and thus to cylinders 19 and 31, is effected by a threeway stopcock including control element 33 and control lever 34.
  • the control element has bores 35 and ⁇ 3,6for selective connection of conduit 22 vwith inlet pipe 3 8- and outlet pipe 37.
  • bore 3S connects conduit 22 with inlet pipe 33 which is connected to a supply of pressure vad (not shown).
  • the pressure fluid will be conducted through conduit 21 into cylinder 19 to press piston 18 to the left and pivot stop 13 olf piston rod 7. Simultaneously, pressure fluid will enter cylinder 31 through conduit 23 to press down piston 26 and increase the bias of spring 27.
  • bore 36 connects conduit 22 with outlet pipe 37.
  • Springs 20 and 27 will move pistons 18 and 26, respectively, back into position l and the displaced pressure uid will ilow back through conduits 21, 23 and 22 into outlet pipe 37 wherefrom it will be led into a storage tank (not shown).
  • the adjustment of the pressure and its correct size is no longer leftfto ythe judgment of the machine operator. Rather, the maximal pressure which may be exerted by the closing tamping tools is automatically adjusted when the opening width is adjusted. This change of the opening width must be effected by the operator in any event and it involves no loss of time, being effected merely by pushing lever 34. This will automatically control the pressure which may be exerted by the closing tamping tools.
  • this pressure control arrangement may be incorporated in any track tamping machine which comprises means for limiting the maximal closing pressure of the tamping tools, for instance a friction coupling arranged in the mechanism for moving the tamping tools. It is particularly advantageous in the hydraulicallyoperated machine described hereinabove.
  • the machine operates as follows:
  • valve closure element 25 which closes off relief pressure conduit 29 from the conduit 11 which communicates therewith through branch pipe 30.
  • This will allow increased pressure in the conduit 11 which supplies cylinder chambers 8 and thus closes the tamping tools.
  • the maximal closing pressure of the tamping tools is automatically increased when their opening width is increased.
  • the tamping tool carrier is raised again. If the next tie is narrower again, i. e. of normal width, lever 34 is moved into position I so that conduit 22 is connected to discharge pipe 37. Under the pressure of springs 20 and 27, pistons 18 and 26 will displace the pressure iiuid in cylinders 19 and 31 until they have reached position I. The displaced uid will ow back into the storage tank through discharge pipe 37 and stop 13 will engage piston rod 7 to limit the opening movement of the tamping tools. Thus, the opening Width ⁇ of tamping tools 3 is decreased by 2s.
  • adjustable stop means larranged to move from inoperative position permitting a greater width of opening between the tamping tools into an operative position adjacent each movable element to limit the outward movement of the tamping tools according to the width of the tie to be tamped, mechanical means for the selective adjustment of the adjustable stop means, means for controlling the maximal pressure applied against the tamping tool moving elements in said closed position, and means operatively connecting the mechanical means and the pressure control means for adjusting the maximal pressure control means in response to the adjustment of the stop means, the maximal pressure upon said tamping tool moving elements being increased when the stop means is in the inoperative position.
  • the track tamping machine of claim 2 comprising means for pivoting the adjustable stop means into and out of the inoperative position, said pivoting means including a cylinder, a piston glidably mounted in said cylinder and defining two chambers therein, means for supplying pressure fluid to one of said chambers, a compression spring mounted in the other one of said chambers and biased to press against the piston, and connecting means linking the glidable piston to the pivotal stop means; means for supplying pressure iluid to said valve; and common pressure fluid charging means for said two pressure iluid supply means whereby pressure will be exerted simultaneously against the pistons in said cylinlder and the valve upon operation of the uid charging means.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
US629183A 1955-12-23 1956-12-18 Track tamping machine Expired - Lifetime US2872878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT359728X 1955-12-23

Publications (1)

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US2872878A true US2872878A (en) 1959-02-10

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US629183A Expired - Lifetime US2872878A (en) 1955-12-23 1956-12-18 Track tamping machine

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US (1) US2872878A (sl)
CH (1) CH359728A (sl)
DE (1) DE1050357B (sl)
FR (1) FR1165588A (sl)
GB (1) GB806333A (sl)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070034A (en) * 1959-11-06 1962-12-25 Jackson Vibrators Tie tamping or ballasting machine
US3343497A (en) * 1965-07-28 1967-09-26 Canada Iron Foundries Ltd Railway track tamping apparatus
US4130063A (en) * 1975-09-16 1978-12-19 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Tamping head
US4563953A (en) * 1982-07-07 1986-01-14 Franz Plasser Bahnbaumaschinen-Industriegesellschaft Mbh Tamping head with limiting stop for tool reciprocation
US4576095A (en) * 1983-11-02 1986-03-18 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Ballast tamping machine
US11053644B2 (en) * 2016-11-25 2021-07-06 Piasser & Theurer Export von Bahnbaumaschinen Gesellschaft m.b.H. Tamping unit for tamping sleepers of a track

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT343166B (de) * 1975-09-16 1978-05-10 Plasser Bahnbaumasch Franz Gleisstopfwerkzeug-aggregat mit einer vorrichtung zur offnungsweitenbegrenzung der stopfwerkzeugpaare

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1367452A (en) * 1919-11-07 1921-02-01 William N Minniear Pressure-valve
US1965057A (en) * 1933-04-18 1934-07-03 Lesher B Rittenhouse Valve gear lock
US2052943A (en) * 1933-08-26 1936-09-01 Schcuchzer Auguste Ballast tamping machine
US2057087A (en) * 1933-02-20 1936-10-13 Galion Iron Works And Mfg Comp Fluid pressure controlling apparatus
US2475723A (en) * 1945-02-05 1949-07-12 Bendix Westinghouse Automotive Fluid pressure control mechanism
AT182113B (de) * 1953-11-30 1955-05-25 Plasser Bahnbaumasch Franz Einrichtung bei Geleisstopfmaschinen zum gegenseitigen Verstellen paarweise angeordneter Stopfwerkzeuge
US2712287A (en) * 1955-07-05 Zurmuhle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712287A (en) * 1955-07-05 Zurmuhle
US1367452A (en) * 1919-11-07 1921-02-01 William N Minniear Pressure-valve
US2057087A (en) * 1933-02-20 1936-10-13 Galion Iron Works And Mfg Comp Fluid pressure controlling apparatus
US1965057A (en) * 1933-04-18 1934-07-03 Lesher B Rittenhouse Valve gear lock
US2052943A (en) * 1933-08-26 1936-09-01 Schcuchzer Auguste Ballast tamping machine
US2475723A (en) * 1945-02-05 1949-07-12 Bendix Westinghouse Automotive Fluid pressure control mechanism
AT182113B (de) * 1953-11-30 1955-05-25 Plasser Bahnbaumasch Franz Einrichtung bei Geleisstopfmaschinen zum gegenseitigen Verstellen paarweise angeordneter Stopfwerkzeuge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070034A (en) * 1959-11-06 1962-12-25 Jackson Vibrators Tie tamping or ballasting machine
US3343497A (en) * 1965-07-28 1967-09-26 Canada Iron Foundries Ltd Railway track tamping apparatus
US4130063A (en) * 1975-09-16 1978-12-19 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Tamping head
US4563953A (en) * 1982-07-07 1986-01-14 Franz Plasser Bahnbaumaschinen-Industriegesellschaft Mbh Tamping head with limiting stop for tool reciprocation
US4576095A (en) * 1983-11-02 1986-03-18 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Ballast tamping machine
US11053644B2 (en) * 2016-11-25 2021-07-06 Piasser & Theurer Export von Bahnbaumaschinen Gesellschaft m.b.H. Tamping unit for tamping sleepers of a track

Also Published As

Publication number Publication date
FR1165588A (fr) 1958-10-27
DE1050357B (sl)
GB806333A (en) 1958-12-23
CH359728A (de) 1962-01-31

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