US3814024A - Pusher pawl mechanism for power and free conveyor system - Google Patents

Pusher pawl mechanism for power and free conveyor system Download PDF

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Publication number
US3814024A
US3814024A US00276188A US27618872A US3814024A US 3814024 A US3814024 A US 3814024A US 00276188 A US00276188 A US 00276188A US 27618872 A US27618872 A US 27618872A US 3814024 A US3814024 A US 3814024A
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United States
Prior art keywords
pusher
trolley
pawl
lever
pusher pawl
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
US00276188A
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English (en)
Inventor
A Peter
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.)
FMC Corp
Original Assignee
FMC Corp
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 FMC Corp filed Critical FMC Corp
Priority to US00276188A priority Critical patent/US3814024A/en
Priority to IT54945/72A priority patent/IT974247B/it
Priority to GB106373A priority patent/GB1383481A/en
Priority to FR7303177A priority patent/FR2194625B1/fr
Priority to DE19732305711 priority patent/DE2305711C3/de
Application granted granted Critical
Publication of US3814024A publication Critical patent/US3814024A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B10/00—Power and free systems
    • B61B10/02—Power and free systems with suspended vehicles
    • B61B10/025—Coupling and uncoupling means between power track abd vehicles

Definitions

  • ABSTRACT A power and free conveyor system has trolleys which are mounted on a free track for driving when engaged by pushers on a continuously running power chain.
  • each trolley, a pusher pawl, lost motion link, and bellcrank lever are interconnected to hold the pusher pawl erect for engagement by a pusher when the lever is in a normal position.
  • the pusher pawl can collapse.
  • the lost motion link also permits collapse of the pusher pawl on overtaking a pusher.
  • One known method of disengaging the load carrying trolley from the driving chain pusher is to diverge the power and free tracks at a point or points where it is desired to stop the load trolley, as for loading or unloading.
  • Another known method of disengaging the load carrying trolley from the driving chain pusher is to collapse the pusher pawl. It is this latter method of drive disengagement to which the present invention is directed.
  • a pivotal bellcrank lever has a forwardly projecting leg and a normallyvertical leg which has a pivotal link mounted at the upper end thereof.
  • a pivotal pusher pawl is mounted on the trolley adjacent the link and is connected thereto by means of a lost motion connection.
  • the lost motion connection consists of a slot in the link and a pusher pawl projection which is received 7 in the slot.
  • the lever, link, and pusher pawl are all pivotal about axes transverse to the direction of motion of the pusher.
  • the pivot axis for the pusher pawl which is of triangular shape, is behind the pivot axes of the link and lever (relative to. the forward direction of travel of the pusher).
  • the bottom of the slot in the link defines an abutment surface which is engaged by the projection on the pusher pawl to hold a drive surface on the pusher pawl upright for engagementby th pusher.
  • the link is cocked and retracted, to retract the abutment surface, and allow the pusher pawl to pivot out of the path of the pusher.
  • the lost motion between the link and the pusher pawl permits the pusher pawl to pivot away from the abutment surface in the link at any time, so that the pusher pawl on the trolley can overtake a pusher atany time.
  • FIG. 1 is a view in side elevation, with parts broken away for clarity, showing a power and free conveyor system embodying the present invention.
  • FIG. 2 is a view taken on the line 2-2 of FIG. 1.
  • FIG. 3 is a diagrammatic illustration of the pusher pawl held in a driving position by the link.
  • FIG. 4 is a view like the view of FIG. 3 except with the link retracting from the pusher pawl holding position.
  • FIG. 5 is a view like the view of FIG. 4 except with the link fully retracted from the pusher pawl.
  • FIG. 6 is a view like the view of FIG. 5 except showing the pusher pawl collapsed by a pusher.
  • FIG. 7 is a view like the view of FIG. 3 except showing the pawl collapsed reversely (from the direction of collapse of FIG. 6) as the trolley overtakes a pusher.
  • an I beam 20 has two opposed lower flanges 22 (only one of which is shown) which define a track for a plurality of power trolleys 24.
  • Each power trolley has a pair of rollers 26 (only one roller of each pair shown) straddling the I beam for engagement with the upper. surfaces of the I opposed flanges 22.
  • the power trolleys support an endless chain 28 which is continuously driven (during operation of the conveyor) by a motor (not shown).
  • Each power trolley carries one of the pushers l0 hanging downwardly therefrom.
  • a pair of opposed channels 30, 32 each has a lower flange 34, 36, the upper surfaces of which define opposed tracks for the free trolleys 12.
  • Each trolley 12 has a pair of spaced apart sideplates 40 with a transverse hub 42 extending therethrough.
  • An axle 44 through the hub carries rollers 46 at each. end which are received on the flanges 34, 36.
  • Guide rollers 48 mounted on a vertical stub axle secured between the sideplates, fits between the inner edges of the lower flanges 34, 36 to prevent any significant side-to-s ide sway of the free trolleys.
  • a bracket 50 for supporting a load (not shown) is suspended from a pin 52 extending through the sideplates 40.
  • a bracket 54 supports a ramp 56 at the rear end of each trolley.
  • a propelling force is transmitted from individual pushers to each trolley 12 through an improved novel mechanism about to be described.
  • a bellcrank lever 60 is pivotally mounted between sideplates 40 on a transverse pin 62 for rocking movement about transverse axis A.
  • the lever has a lower leg 64 extending in a generally forwardly direction and an upper leg 66 extending in a generally upwardly direction.
  • the lower leg 64 terminates in a pad 68, which, when it engages the ramp 56 of the preceding conveyor, tilts the lever clockwise (as viewed in FIG. 1) about axis A.
  • the extreme limits of movement of lever 60 is defined by hub 42 (extreme counterclockwise movement) and a pin 70 (extreme clockwise movement) extending between the sideplates 40.
  • the pusher pawl 14 is triangular shaped and is received between sideplates 40 and pivots about a transverse axis B defined by a transverse pivot pin 74.
  • the pin 74 extends through the sideplates 40 and through one corner of the pawl 14.
  • the pawl 14 has a leg 76 which extends in a generally forwardly direction (when the pin is oriented as shown on the right hand trolley in FIG. 1) and a leg 78 which extends in a generally upwardly direction when the pawl is so oriented.
  • the forward leg has a pin 80 extending therethrough to define projections on each side of the pawl.
  • the upwardly extending leg 78 has a flat rear contact surface 82 for engagement by the pusher 10 when the pawl is in the position shown on the right hand trolley in FIG. 1.
  • the position of the pusher pawl 14 is controlled by movement of the lever 60 which is operated by the ramp-56 of the preceding trolley (or by a similarly shaped stop member (not shown) positioned in the path of the trolley to stop the trolley). It is desired to remove the pusher pawl 14 of a trolley from the path of the pushers 10 when the trolley reaches a preceding trolley, or when a stop member having a ramp similarto ramp 56 is placed in the path of the trolley. It is also necessary to securely hold the pawl in the path of a forward moving pusher 10 when no trolley or stop member is in the path of the trolley.
  • the projections 80 on pusher pawl 14 are received in the slots 90 and define with the slots a lost motion connection between the links 84 and the pusher pawl 14. Although the slots are open ended, the projections 80 of the pusher pawl remain in the slots since the limits of extreme movement of the pusher pawl (abutment surface 92 for extreme counterclockwise movement arid a pin 94 between sideplates 40 for extreme clockwise movement) will no permit disengagement of the pusher pawl from the links.
  • FIGS. 3 to 7 The operation of the mechanism through which power is transmitted from the continuously forwardly moving pushers 10 and the trolleys 12 can best be understood by reference to FIGS. 3 to 7.
  • the lever 60 When the lever 60 is in the normal driving position (as the lever 60 of the right hand trolley FIG. 1), the upper leg thereof is substantially vertical. At that time, the projections and slots are directly above the upper leg of the lever. In other words, the projections 80 are in a substantially straight line with axes A and C, and the pusher pawl 14 is securely held against counterclockwise rotation (as viewed in FIG. 3) about axis B. Thus a pusher engaging the rear surface 82 of the pusher pawl will move the trolley forward (to the left as viewed in FIG. 3).
  • the pusher pawl 14 can freely rotate clockwise about axis B by virtue of the lost motion connection between pusher pawl 14 and links 84 which permits the projections 80 to rise in slots 90.
  • a pusher pawl 14 can overtake a pusher 10.
  • the weight of the pad 68 is sufficient to allow the lever 60 to swing counterclockwise (from the position of the lever on the left trolley of FIG. 1 to the position of the right trolley on FIG. 1) when the preceding trolley is advanced (or a stop member removed from the path of the trolley). At that time, the links 84, being restrained by the projections 80, will swing back to the position of FIG. 3 to again hold the pusher pawl erect for engagement by the next pusher.
  • a power and free trolley system having a trolley movable along a track and having a pusher movable in a forward direction to drive the trolley.
  • the combination comprising means defining a stop member positionable in the path of the trolley, a lever pivotally mounted on the trolley and normally held in a drive position, said lever movable from said drive position in response to engagement'with said stop member, a pusher pawl mounted on the trolley for pivotal movement about an axis, said pusher pawl having a projection thereon, and a link pivotally connected to said lever and movable thereby when the lever is moved, said link having a slot therein.
  • the combination comprising means defining a stop member in the path of the trolley, ai lever on the trolley movable from a drive position in response to approach of the trolley to said stop member, a pusher pawl pivotally mounted on the trolley,.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chain Conveyers (AREA)
  • Pusher Or Impeller Conveyors (AREA)
US00276188A 1972-07-28 1972-07-28 Pusher pawl mechanism for power and free conveyor system Expired - Lifetime US3814024A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00276188A US3814024A (en) 1972-07-28 1972-07-28 Pusher pawl mechanism for power and free conveyor system
IT54945/72A IT974247B (it) 1972-07-28 1972-12-21 Perfezionamento nei trasportatori
GB106373A GB1383481A (en) 1972-07-28 1973-01-09 Conveyor systems
FR7303177A FR2194625B1 (it) 1972-07-28 1973-01-30
DE19732305711 DE2305711C3 (de) 1972-07-28 1973-02-06 An- und Abkupplungseinrichtung für Schleppkettenkreisförderer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00276188A US3814024A (en) 1972-07-28 1972-07-28 Pusher pawl mechanism for power and free conveyor system

Publications (1)

Publication Number Publication Date
US3814024A true US3814024A (en) 1974-06-04

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ID=23055574

Family Applications (1)

Application Number Title Priority Date Filing Date
US00276188A Expired - Lifetime US3814024A (en) 1972-07-28 1972-07-28 Pusher pawl mechanism for power and free conveyor system

Country Status (4)

Country Link
US (1) US3814024A (it)
FR (1) FR2194625B1 (it)
GB (1) GB1383481A (it)
IT (1) IT974247B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593624A (en) * 1985-02-11 1986-06-10 Planet Corporation Power and free conveyor
US4981081A (en) * 1989-05-24 1991-01-01 Mid-West Conveyor Company, Inc. Center link pusher dog for power and free conveyors
US20170107057A1 (en) * 2014-05-29 2017-04-20 Esypro Manutención S.L.U. Flexible manual storage system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2818758A1 (de) * 1978-04-28 1979-10-31 Duerkoppwerke Power and free-mitnehmer fuer schleppkreisfoerderer und einzelschleppgeraete
CN105460503B (zh) * 2015-09-30 2017-10-31 徐州建机工程机械有限公司 一种积放链合分车装置的拨杆机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200768A (en) * 1963-09-04 1965-08-17 Mechanical Handling Sys Inc Conveyor system with accumulating trolley units
US3420188A (en) * 1966-02-14 1969-01-07 Webb Co Jervis B Dog positioning mechanism for conveyor carriers
US3559586A (en) * 1968-11-29 1971-02-02 Rapistan Inc Retracting push-rod assembly for conveyors
US3602148A (en) * 1969-02-05 1971-08-31 Fmc Corp Conveying apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200768A (en) * 1963-09-04 1965-08-17 Mechanical Handling Sys Inc Conveyor system with accumulating trolley units
US3420188A (en) * 1966-02-14 1969-01-07 Webb Co Jervis B Dog positioning mechanism for conveyor carriers
US3559586A (en) * 1968-11-29 1971-02-02 Rapistan Inc Retracting push-rod assembly for conveyors
US3602148A (en) * 1969-02-05 1971-08-31 Fmc Corp Conveying apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593624A (en) * 1985-02-11 1986-06-10 Planet Corporation Power and free conveyor
US4981081A (en) * 1989-05-24 1991-01-01 Mid-West Conveyor Company, Inc. Center link pusher dog for power and free conveyors
US20170107057A1 (en) * 2014-05-29 2017-04-20 Esypro Manutención S.L.U. Flexible manual storage system
US9896270B2 (en) * 2014-05-29 2018-02-20 Esypro Manutención S.L.U. Flexible manual storage system

Also Published As

Publication number Publication date
FR2194625A1 (it) 1974-03-01
IT974247B (it) 1974-06-20
DE2305711B2 (de) 1977-01-13
FR2194625B1 (it) 1977-12-30
DE2305711A1 (de) 1974-02-21
GB1383481A (en) 1974-02-12

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