US3648619A - Stop for power and free conveyors - Google Patents

Stop for power and free conveyors Download PDF

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Publication number
US3648619A
US3648619A US34972A US3648619DA US3648619A US 3648619 A US3648619 A US 3648619A US 34972 A US34972 A US 34972A US 3648619D A US3648619D A US 3648619DA US 3648619 A US3648619 A US 3648619A
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United States
Prior art keywords
trolley
stop
stop member
drive
path
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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
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US34972A
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English (en)
Inventor
Keith Wilkinson
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.)
Geo W King Ltd
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Geo W King Ltd
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Publication date
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Publication of US3648619A publication Critical patent/US3648619A/en
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Classifications

    • 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 [30] Foreign Application Priority Data
  • a power and free conveyor has trolleys driven along a fixed track by abutments on the trolleys being engaged by dogs de- June 6, 1969 Great Britain ..28,892/69 pending from an endless drive chain.
  • a Stop is spring-biassed into an operative position in which it depresses (g1. ..l04/250, 104/172 the abutment of a trolley out of the path of the dogs
  • a crank lever has one arm which can be moved into that path.
  • Field of Search ..104/249, 250, 252, 172 S when a dog turns the one arm, the other arm retracts the stop and the dog then moves the trolley from the station.
  • References Cited pon the trolley releases a latch which holds the stop retracted, UNlTED STATES PATENTS so that the stop returns to its operative position.
  • the drive abutments carried by the trolleys are so arranged that while they normally assume a projected or upstanding position wherein they will be contacted by the depending dogs on the driven chain, they are nevertheless capable of depression or downward displacement into a position wherein they will be out of the path of said drive dogs, the arrangement being such that when a drive abutment on a trolley is so depressed the drive dogs on the driven chain will merely travel idly over the top of the trolley and no drive will be imparted to the latter.
  • a stop mechanism adapted to be installed at a selected station along the conveyor path, such mechanism comprising a stop member adapted normally to assume an operative position wherein it will be effective to depress the drive abutment on any load-carrying trolley arriving at the station thereby to effect discontinuance of the drive to such trolley and a member which, when it is required to release the trolley from the station, is moveable into the path of the drive dogs on the driven chain, such member being adapted, when contacted by one of said drive dogs, to be moved to cause retraction of the stop member from its operative position thereby to allow the drive abutment on the trolley to return to its operative position so that the trolley may then be driven from the station there also being means operative as the trolley is driven away from said station to ensure return of the stop member to its initial operative position in readiness for a further operational sequence.
  • FIG. 1 is a perspective view illustrating a small part of a conveyor of the kind with which the invention is concerned,
  • FIG. 2 is a side elevational view of a stop mechanism
  • FIG. 3 is a sectional view on the line A-A of FIG. 2, and
  • FIG. 4 is a plan view of the mechanism shown in FIG. 2.
  • FIG. 1 which illustrates diagrammatically a small section of a conveyor of the kind with which the invention is concerned, denotes a load-carrying trolley which is equipped with a depending load bar 11 from which loads to be conveyed are suspended.
  • Load-carrying trolleys such as that indicated at 10 are propelled along a fixed track 12 hereinafter termed the trolley track, by means of an endless driven chain 13 which is supported at spaced points along its length by means of so-called chain trolleys one of which is indicated at 14.
  • the chain trolleys run on a second fixed track 16, hereinafter termed the chain trolley track, disposed vertically above the track 12.
  • the chain 13 is provided at spaced points along its length with depending pusher dogs 17 which are adapted to cooperate with driving abutments on the loadcarrying trolleys and to cause the latter to be propelled along the track 12.
  • l8 denotes the driving abutment on the trolley 10.
  • each trolley is equipped with an upstanding retainer abutment 19 which will be effective to prevent uncontrolled forward movement of the trolley relative to the chain 13.
  • the drive abutment 18 on each trolley is so mounted as to be capable of retraction into a position wherein it will lie out of the path of the pusher dogs 17 on the chain.
  • the retainer abutment 19 on each trolley I0 is so mounted that while being free to pivot forwardly, i.e., in the direction of travel of the trolley, it will be held against movement past the vertical position in a rearward direction.
  • conveyors of the kind described with reference to FIG. 1 are generally well known and further description thereof is not considered necessary.
  • FIGS. 2-4, 12 again denotes the track along which load-carrying trolleys are caused to travel while 16 again denotes the chain trolley track which serves to support the chain trolleys from which the endless driven chain is suspended.
  • the stop mechanism of the: invention is as will be seen clearly from FIG. 3 mounted at the side of the chain and load trolley tracks 12, I6 and comprises a stop member 20 which is supported for longitudinal sliding movement back and forth from and into an operative position wherein it projects across the top of the track 12 and into the path of the depressible drive abutrnents on the load trolleys. Under normal conditions, the member 20 will be maintained in its operative or projected position into which it is urged by means of a spring 21. Mounted at the rear end of the slide is a pivoted dog 22 which is normally maintained in the position shown in FIG. 3 by means of a counterweight 23.
  • a bell crank lever 25 which is normally held in an inoperative position as shown in FIG. 4 by means of a spring 26.
  • One of the arms of the bell crank lever 25 carries at its underside a cam follower roller 27 which is mounted for free rotational movement on a pin 28.
  • Pivotally connected to the other arm of the bell crank level 25 is a link 29 by means of which said lever is coupled to a solenoid 30.
  • a back stop assembly which in the embodiment illustrated comprises a roller 32 mounted on a stop arm 33 such stop arm being pivotally mounted and normally urged into its operative position by means of a spring.
  • the ar rangement is such that normally the back stop which will be located below the track 12 will project into the path of the load-carrying trolleys or elements carried thereby.
  • the trolley When the trolley is being driven from the drive chain it (the trolley) will normally brush past the back stop which will merely pivot idly and be returned to its operative position by the spring when the trolley has passed.
  • the back stop will then be effective to prevent undesirable rearward travel of the trolley i.e., movement of the trolley in the reverse direction to that in which it is normally driven.
  • the back stop assembly may well take other forms but whatever its construction its function will be that indicated above.
  • a plunger 34 is provided such plunger which is loaded by a compression spring 35 being pivotally connected to an arm 36 which is in turn fixedly mounted on a shaft 37.
  • the shaft 37 which is appropriately journaled for rotation about its longitudinal axis, carries at its lower end an arm 38 adapted to project into the path of a ramp or other appropriate element carried by the trolleys.
  • the plunger 34 is maintained in the position shown in FIGS. 2 and 4 but it is adapted on retraction of the stop member 20 to move under the action of its spring into engagement with a notch or recess in the side of said stop member thereby to lock the same in its retracted position.
  • the notch or recess in the side of the stop member 211 is so dimensioned that when the plunger 34 is engaged therein said stop member will nevertheless be capable of a small overrunning or additional retractive movement.
  • the stop mechanismdescribed above is adapted to operate in the following manner:
  • the solenoid 30 will be momentarily energized thereby to cause pivotal movement of the bell crank lever in a clockwise direction as shown which will bring the cam follower 27 into a position in front of the dog 22 on the stop member 20.
  • the pivotal movement of the lever 25 will result in the second arm of such lever being caused to project across the top of the track 12 and into the path of the drive dogs on the drive chain.
  • a dog on the drive chain contacts the then projecting arm of the lever 25 it will by virtue of the movement of the chain impart a reverse i.e., a counterclockwise movement to the lever 25 so that the cam follower 27 which is then in contact with the dog 22 will push the latter thus causing the stop member 20 to retract.
  • the spring loaded plunger 34 On retraction of the stop member 20 the spring loaded plunger 34 will move into engagement with the notch or recess on the side of said stop member and will effectively lock the same in its retracted position. Due to the slight overrun allowed to the stop member 20 by virtue of the dimensioning of the notch or recess, the cam follower 27 will, with continued counterclockwise movement of the lever 25, be disengaged from the dog 22 and the lever will be returned to its initial position under the action of its spring 26. It must be pointed out here that the solenoid 30 is energized only for a short duration sufficient to cause the lever 25 to assume its operative position.
  • Conveyor power is employed to retract the stop only a light solenoid being required to initiate the operation i.e., to move the lever 25 to its operative position.
  • the mechanism is fail-safe i.e., it does not require electrical or other form of power to return the stop member 20 to its normal position.
  • the load trolley is at all times under control as the drive dog on the chain which effectively releases the stop is the same dog which will subsequently be effective to drive the trolley.
  • stop mechanism as in claim 1 in which the stop member is supported for longitudinal sliding movement back and forth from and into its operative position wherein it extends transversely across the fixed track and into the path of the drive abutment on any approaching load trolley, said biassing means comprising a spring.
  • a stop mechanism as in claim 1 a pivoted abutment on the stop member, said abutment being biassed so as normally to assume an operative position, the member for causing retraction of said stop member comprising a bell crank lever which is mounted for angular movement about a fixed pivot and is urged into an inoperative position by means of a spring, the arrangement being such that on an initial angular movement of the lever from its inoperative position one arm thereof will be moved into the path of the dogs on the endless driven chain and contact of a dog with such arm will result in a reverse angular movement of the lever such as will cause the second arm thereof to cooperate with the abutment on the stop memberthereby to move said stop member into its retracted position.
  • a stop mechanism as in claim 3 comprising a solenoid to effect initial angular movement of the bell crank lever as a result of energization of the solenoid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Intermediate Stations On Conveyors (AREA)
  • Chain Conveyers (AREA)
  • Pusher Or Impeller Conveyors (AREA)
US34972A 1969-06-06 1970-05-06 Stop for power and free conveyors Expired - Lifetime US3648619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28892/69A GB1243876A (en) 1969-06-06 1969-06-06 Improvements in or relating to conveyors

Publications (1)

Publication Number Publication Date
US3648619A true US3648619A (en) 1972-03-14

Family

ID=10282876

Family Applications (1)

Application Number Title Priority Date Filing Date
US34972A Expired - Lifetime US3648619A (en) 1969-06-06 1970-05-06 Stop for power and free conveyors

Country Status (6)

Country Link
US (1) US3648619A (enrdf_load_html_response)
DE (1) DE2026101A1 (enrdf_load_html_response)
ES (1) ES380463A1 (enrdf_load_html_response)
FR (1) FR2045874B1 (enrdf_load_html_response)
GB (1) GB1243876A (enrdf_load_html_response)
SE (1) SE368807B (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831528A (en) * 1973-09-13 1974-08-27 Rapistan Inc Pressure relieved trolley stop for conveyors
EP0144886A3 (en) * 1983-12-13 1986-04-16 Rosenheimer Foerderanlage Positioning device for the vehicles of a suspended cableway
US5511487A (en) * 1994-04-14 1996-04-30 Daifuku Co., Ltd. Transport system with electric movers
US6253684B1 (en) 1998-08-18 2001-07-03 Conveyor Technology Group, Inc. Stop mechanism for power and free conveyor system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU245593A1 (ru) * Н. Г. Гурари, Л. В. Аронович , М. С. Лейтес Конвейер для транспортировки закрепленного на троллеях груза
US3347171A (en) * 1965-03-23 1967-10-17 Webb Co Jervis B Carrier stop and track hangar for power and free conveyors
US3437054A (en) * 1966-10-20 1969-04-08 Mechanical Handling Sys Inc Power and free conveyor system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1291424A (fr) * 1961-06-08 1962-04-20 Fischer & Ludlow Ltd Perfectionnements apportés aux installations transporteuses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU245593A1 (ru) * Н. Г. Гурари, Л. В. Аронович , М. С. Лейтес Конвейер для транспортировки закрепленного на троллеях груза
US3347171A (en) * 1965-03-23 1967-10-17 Webb Co Jervis B Carrier stop and track hangar for power and free conveyors
US3437054A (en) * 1966-10-20 1969-04-08 Mechanical Handling Sys Inc Power and free conveyor system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831528A (en) * 1973-09-13 1974-08-27 Rapistan Inc Pressure relieved trolley stop for conveyors
EP0144886A3 (en) * 1983-12-13 1986-04-16 Rosenheimer Foerderanlage Positioning device for the vehicles of a suspended cableway
US5511487A (en) * 1994-04-14 1996-04-30 Daifuku Co., Ltd. Transport system with electric movers
US6253684B1 (en) 1998-08-18 2001-07-03 Conveyor Technology Group, Inc. Stop mechanism for power and free conveyor system

Also Published As

Publication number Publication date
SE368807B (enrdf_load_html_response) 1974-07-22
GB1243876A (en) 1971-08-25
ES380463A1 (es) 1972-09-01
FR2045874B1 (enrdf_load_html_response) 1975-02-21
FR2045874A1 (enrdf_load_html_response) 1971-03-05
DE2026101A1 (enrdf_load_html_response) 1970-12-10

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