US3434738A - Push-pull coupling for tractor-scraper units - Google Patents

Push-pull coupling for tractor-scraper units Download PDF

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Publication number
US3434738A
US3434738A US642754A US3434738DA US3434738A US 3434738 A US3434738 A US 3434738A US 642754 A US642754 A US 642754A US 3434738D A US3434738D A US 3434738DA US 3434738 A US3434738 A US 3434738A
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US
United States
Prior art keywords
scraper
coupling
push
tractor
push block
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
US642754A
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English (en)
Inventor
Trevor G Campbell
Lawrence P Coogan
Yoshimi Hosoda
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Application granted granted Critical
Publication of US3434738A publication Critical patent/US3434738A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/01—Traction couplings or hitches characterised by their type
    • B60D1/04—Hook or hook-and-hasp couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D49/00—Tractors
    • B62D49/04—Tractors modified to take pushing devices

Definitions

  • a p-ush block and means for engaging the hook are mounted on the front of a rearw-ard scraper.
  • the means for engaging the hook are raised and lowered by a scraper operator through a hydraulic jack for rapid engagement or disengagement with the hook of the forward scraper.
  • the present invention relates to a push-pull coupling for earthmoving scraper units and more particularly to a coupling having means for rapid connection and disconnection o the coupling whereby the Scrapers may operate intermittently either in tandem or as separate units.
  • Tractor-Scrapers of a type which do not have elevators but rather are loaded according to their forward motion generally do not have suiiicient power for efficient selfloading.
  • this method of loading has been at least partly undesirable since it requires the use of additional units during loading and detracts from overall operating efficiency during an earthmoving operation.
  • the present invention provides a push-pull coupling between selfpowered vehicles wherein the coupling includes means for rapid connection or disconnection such that the vehicles may operate intermittently either in coupled relation or as independent units.
  • FIG. l is a side view in elevation of the present pushpull coupling employed between two Scrapers
  • FIG. 2 is a side view in elevation of the push-pull coupling with the parts illustrated in pulling relation;
  • FIG. 3 is a side view in elevation of the push-pull coupling with parts in pushing relation.
  • FIG. 4 is a plan view of the coupling with parts shown in section.
  • a forward scraper 11 and a rearward. scraper 12 are illustrated in FIG. l in an arrangement suitable for tandem operation.
  • a push-pull coupling is disposed between the rear of the forward scraper and the front of the rearward scraper.
  • the coupling has a portion 14 disposable at the rear of the forward scraper which comprises a push block 16 and a pulling hook 17.
  • the coupling also has a portion 13 disposed upon the front of the rearward scraper including a push block assembly 19 and a moveable means or bail 21 to engage the pulling hook 17.
  • An operator of one of the tractors, preferably the rear tractor controls the position of the bail 21 between its engaged and disengaged relation with the pulling hook through suitable means such as the hydraulic jack indicated at 22.
  • the coupling portion disposed at the rear of the forward scraper is mounted on its rearwardly extending framework 23 which has a usual push block 24 mounted thereon.
  • the additional push block structure 16 permitting better cooperation with the other coupling components, is aixed to the standard push block 24.
  • the pulling hook 17 is welded to a pair of forwardly diverging braces 27 and a downwardly extending member 28.
  • the braces are pinned to the scraper framework at 29 while the downwardly extending member is bolted to the push block ⁇ at 31.
  • the braces have cross-pieces 32 and 331 welded thereto to provide structural reinforcement.
  • the rear coupling portion 18 is mounted at the forward end of main frame members 34 of the rearward tractor by means of forward extending brackets 36 which are bolted thereto.
  • the bail 21 for engaging the forward pulling hook is preferably angular and is pivotally connected to each of the brackets 36 by means of pins 37.
  • the hydraulic jack 22, which is operable by the rearward tractor operator, is pivotally connected to the rear tractor frame at 38 and has its rod 39 pivotally connected to an offset tab 41 of the bail adjacent one of its pivotal connections with the tractor frame.
  • the triangulated support members 27 of the forward coupling portion cooperate with the angular bail to guide it into engaging relation with the pulling hook 17.
  • a support member 42 (FIG. 4) is disposed transversely between the brackets 36 which are bolted to the tractor frame.
  • Two pairs of push block brackets 43 and i4 extend forwardly and generally upwardly from the support member 42.
  • the rear push block comprises a gate assembly i6 which is pivotally secured to each of the bracket pairs by means of a ball joint, one of which is shown at 47.
  • two conventional spring groups 48 comprising a plurality of interconnected resilient pads 49 are pivotally supported as at Sil by brackets 51 which are secured to the rear surface of the push block gate 46.
  • Each spring group extends rearwardly to be bolted to the support member d2 by means of bolts SZ.
  • a bar 53 extends laterally through the push block gate assembly i6 and projects outwardly a short distance on either side thereof. This bar adds strength to the gate assembly and provides a down stop for the bail 2l to prevent it from being nosed into the ground at any time.
  • a resilient stop block Sli is provided on each of the bracket pairs 43 and 44 to provide a positive rearward limit for pivotal motion of the gate assembly 46.
  • the bail is lowered, preferably during the prior push operation, into engagement with the pulling hook by the tractor operator causing extension of the hydraulic jack 22 whereupon the bail is lowered over the pulling hook and into contact with the forwardly extending support members 27. Since the coupling portions are in pushing relation as illustrated in FIG. 4, the bail rests upon the support members 27; and as the speed of the forward scraper is increased relative to the rear scraper, the bail rides on the support members 27 and is thus guided into positive engagement with the pulling hook whereupon the coupling portions are in pulling relation as illustrated in FIG. 2.
  • Additional advantages of the present invention are provided primarily through the ability of the coupling to be rapidly engaged and disengaged whereby the two scraper units may cooperate in a tandem relation or may be disengaged during normal operation to permit the two units to operate as separate self-contained units. For example, if there is a breakdown in either scraper, the other scraper may simply continue in operation by itself or in combination with still another scraper unitl provided with the present coupling. Also, the ability to separate the two scraper units during operation permits greater maneuverability of the units as they leave the borrow pit or loading area and travel to an unloading site. Still further, since an operator is controlling each scraper unit during its tandem operation with another unit, proper control of each scraper is provided to increase overall operating efficiency.
  • a push-pull coupling for disposition between a tandem combination of self-powered vehicles and providing for selective coupling and uncoupling of the vehicles while traveling at normal operating speeds comprising:
  • a coupling portion arranged on the front of one vchicle and including a forwardly facing push block, a pivotal bail formed with two elongated members which are mechanically secured to a frame member of the one vehicle and extend forwardly in angularly closing relation, and means for controlling the pivotal position of the bail, the control means being disposed for regulation by an operator of one of the vehicles, and
  • the other coupling portion including a rearwardly facing push block to generally mate with the forwardly facing push block to permit pushing of the other vehicle by the one vehicle, and hook means for engagement by the bail to permit pulling of the one vehicle by the other vehicle, the hook means being supported by a structure secured to a frame member of the other vehicle, the support structure including a triangular guide member diverging forwardly from the hook and another member arranged to form a vertical extension of the rearwardly facing push block, one of the push blocks including shock absorbing means to absorb shock caused by contact between said coupling portions during travel of the two vehicles.
  • control means is a hydraulic jack interconnected between said rear trac- 5 6 tor and said pivotal bail, said hydraulic jack being op- 2,587,208 2/ 1952 Peterson 280-481 X erable from the rear tractor to control the pivotal posi- 2,674,815 4/1954 Adams 37-126 tion of the bail. 2,788,999 4/ 1957 Fryer 280-481 5.
  • the invention of claim 1 further comprising a me- 2,986,827 6/ 1961 Peterson 37-144 chanical stop disposed in the coupling portion of the one 5 3,079,176 2/ 1963 Duke et al 280--481 vehicle for interaction with the pivotal bail to limit its 3,243,203 3/ 1966 Hermiz et al 280-481 downward motion and prevent it from nosing into the 3,290,806 12/ 1966 Peterson 37-129 ground particularly when the rearward vehicle is operating independently, LEO FRIAGLIA, Primary Examiner.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Agricultural Machines (AREA)
US642754A 1967-06-01 1967-06-01 Push-pull coupling for tractor-scraper units Expired - Lifetime US3434738A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US64275467A 1967-06-01 1967-06-01

Publications (1)

Publication Number Publication Date
US3434738A true US3434738A (en) 1969-03-25

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ID=24577876

Family Applications (1)

Application Number Title Priority Date Filing Date
US642754A Expired - Lifetime US3434738A (en) 1967-06-01 1967-06-01 Push-pull coupling for tractor-scraper units

Country Status (5)

Country Link
US (1) US3434738A (fr)
BE (1) BE706844A (fr)
DE (1) DE1630248A1 (fr)
FR (1) FR1549610A (fr)
GB (1) GB1193986A (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740080A (en) * 1971-11-10 1973-06-19 Gen Motors Corp Cushioned hook for a push-pull type vehicle coupling
US3847416A (en) * 1973-11-02 1974-11-12 Caterpillar Tractor Co Hydraulic control circuit with remotely controlled dual pressure relief valve
US3906613A (en) * 1974-10-25 1975-09-23 Caterpillar Tractor Co Method of installing a push-pull coupling on a scraper vehicle
US3977699A (en) * 1974-06-12 1976-08-31 Kabushiki Kaisha Komatsu Seisakusho Shock-absorbing push-pull coupling for tandem scrapers
US3997275A (en) * 1976-03-25 1976-12-14 Caterpillar Tractor Co. Force transmitting connection
US4025086A (en) * 1975-10-31 1977-05-24 Caterpillar Tractor Co. Push block assembly with shear load transmitting means
US4078820A (en) * 1976-10-29 1978-03-14 Caterpillar Tractor Co. Bail for push-pull scraper
US4166633A (en) * 1975-11-07 1979-09-04 Fiat-Allis Construction Machinery, Inc. Coupling hook for pulling vehicles
US4266798A (en) * 1979-02-14 1981-05-12 Caterpillar Tractor Co. Push-pull coupling for power scrapers
US5382042A (en) * 1993-11-15 1995-01-17 Mcphee; Steven J. Towing device support
FR2861651A1 (fr) * 2003-10-29 2005-05-06 Etude Conditionnement Palettis Timon d'attelage de deux chariots
US7937858B2 (en) 2008-11-21 2011-05-10 Caterpillar Inc. Hitch assembly and tractor scraper using same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625989A (en) * 1985-12-16 1986-12-02 Deere & Company Tractor/implement hitch

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1807379A (en) * 1926-09-17 1931-05-26 Clark Tructractor Co Draft coupling for tractors and trailers
US2529159A (en) * 1946-10-24 1950-11-07 Plant Choate Mfg Co Inc Earth-moving equipment
US2587208A (en) * 1950-10-13 1952-02-26 Louis L Peterson Vehicle coupling
US2674815A (en) * 1949-08-20 1954-04-13 Gen Motors Corp Bowl and apron control for carry type scrapers
US2788999A (en) * 1952-04-23 1957-04-16 Gen Motors Corp Pusher bumper for lever type scraper
US2986827A (en) * 1958-04-10 1961-06-06 Caterpillar Tractor Co Bulldozer for tandem push loading
US3079176A (en) * 1961-01-03 1963-02-26 Int Harvester Co Push bumper for vehicles
US3243203A (en) * 1963-08-29 1966-03-29 Int Harvester Co Cushion bumper for vehicle
US3290806A (en) * 1964-12-02 1966-12-13 Caterpillar Tractor Co Controls for tandem operated earthmoving scrapers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1807379A (en) * 1926-09-17 1931-05-26 Clark Tructractor Co Draft coupling for tractors and trailers
US2529159A (en) * 1946-10-24 1950-11-07 Plant Choate Mfg Co Inc Earth-moving equipment
US2674815A (en) * 1949-08-20 1954-04-13 Gen Motors Corp Bowl and apron control for carry type scrapers
US2587208A (en) * 1950-10-13 1952-02-26 Louis L Peterson Vehicle coupling
US2788999A (en) * 1952-04-23 1957-04-16 Gen Motors Corp Pusher bumper for lever type scraper
US2986827A (en) * 1958-04-10 1961-06-06 Caterpillar Tractor Co Bulldozer for tandem push loading
US3079176A (en) * 1961-01-03 1963-02-26 Int Harvester Co Push bumper for vehicles
US3243203A (en) * 1963-08-29 1966-03-29 Int Harvester Co Cushion bumper for vehicle
US3290806A (en) * 1964-12-02 1966-12-13 Caterpillar Tractor Co Controls for tandem operated earthmoving scrapers

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740080A (en) * 1971-11-10 1973-06-19 Gen Motors Corp Cushioned hook for a push-pull type vehicle coupling
US3847416A (en) * 1973-11-02 1974-11-12 Caterpillar Tractor Co Hydraulic control circuit with remotely controlled dual pressure relief valve
US3977699A (en) * 1974-06-12 1976-08-31 Kabushiki Kaisha Komatsu Seisakusho Shock-absorbing push-pull coupling for tandem scrapers
US3906613A (en) * 1974-10-25 1975-09-23 Caterpillar Tractor Co Method of installing a push-pull coupling on a scraper vehicle
US4025086A (en) * 1975-10-31 1977-05-24 Caterpillar Tractor Co. Push block assembly with shear load transmitting means
US4166633A (en) * 1975-11-07 1979-09-04 Fiat-Allis Construction Machinery, Inc. Coupling hook for pulling vehicles
US3997275A (en) * 1976-03-25 1976-12-14 Caterpillar Tractor Co. Force transmitting connection
US4078820A (en) * 1976-10-29 1978-03-14 Caterpillar Tractor Co. Bail for push-pull scraper
US4266798A (en) * 1979-02-14 1981-05-12 Caterpillar Tractor Co. Push-pull coupling for power scrapers
US5382042A (en) * 1993-11-15 1995-01-17 Mcphee; Steven J. Towing device support
FR2861651A1 (fr) * 2003-10-29 2005-05-06 Etude Conditionnement Palettis Timon d'attelage de deux chariots
US7937858B2 (en) 2008-11-21 2011-05-10 Caterpillar Inc. Hitch assembly and tractor scraper using same

Also Published As

Publication number Publication date
BE706844A (fr) 1968-05-21
FR1549610A (fr) 1968-12-13
GB1193986A (en) 1970-06-03
DE1630248A1 (de) 1971-06-16

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