Manufacturing cell and elements of the cell

• US 8,108,989 B2
• Filed: 06/28/2007
• Issued: 02/07/2012
• Est. Priority Date: 06/28/2007
• Status: Active Grant

• Current Assignee: Crown Equipment Corporation
• Original Assignee: Crown Equipment Corporation
• Inventors: Muhlenkamp, Rick J., Schaefer, David G., Thomas, Todd A., Wagner, Stephen E., Zacharias, Joel E.
• Primary Examiner(s): Afzali, Sarang
• Application Number:
  US11/770,479
• Publication Number:
  US 20090000103A1
• Time in Patent Office: 1,685 Days
• Field of Search: 297/94, 297/71, 297/83, 297/86, 297/91, 297/93, 297/99, 297/11, 297/12, 294/31, 294/29, 294/30, 298/22, 298/24, 193/35.R, 193/35.SS, 193/37, 198/457.02, 198/539, 198/861.2, 414/272, 414/279, 414/281
• US Class Current: 29/794
• CPC Class Codes: B23P 21/004 the units passing two or more work-stations whilst being composed
• CPC Class Codes: B65G 37/02 Flow-sheets for conveyor combinations in warehouses, magazines or workshops
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49764 with testing or indicating
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/49829 Advancing work to successive stations [i.e., assembly line]
• CPC Class Codes: Y10T 29/49831 Advancing station
• CPC Class Codes: Y10T 29/5196 Multiple station with conveyor
• CPC Class Codes: Y10T 29/53048 Multiple station assembly or disassembly apparatus
• CPC Class Codes: Y10T 29/53052 including position sensor
• CPC Class Codes: Y10T 29/53313 Means to interrelatedly feed plural work parts from plural sources without manual intervention
• CPC Class Codes: Y10T 29/53365 Multiple station assembly apparatus
• CPC Class Codes: Y10T 29/53378 including converging conveyors
• CPC Class Codes: Y10T 29/534 Multiple station assembly or disassembly apparatus
• CPC Class Codes: Y10T 29/53413 and primary central conveyor
• CPC Class Codes: Y10T 29/53435 including assembly pallet
• CPC Class Codes: Y10T 29/53548 and work carrying vehicle

Abstract

A manufacturing cell has a plurality of stations arranged in two rows having a main aisle therebetween. Each of the plurality of stations has a station-aisle interface that provides an interaction area to the main aisle. The manufacturing cell also comprises a plurality of storage units that are located within the cell along the main aisle and a guided forklift truck that traverses the main aisle without requiring steering control of a stock handler operating the forklift truck within the main aisle to relocate containers from the storage units to designated station-aisle interfaces and to remove containers from the designated station-aisle interfaces when work is completed at the corresponding stations.

Claims

1. A manufacturing cell comprising:

a main aisle;

a plurality of stations arranged in two rows such that said main aisle passes between said two rows, each of said plurality of stations has a station-aisle interface that provides an interface area to said main aisle and is configured such that a corresponding station operator is capable of performing a predefined function associated with said manufacturing cell at a station work area;

a plurality of storage units located within said cell along said main aisle, each storage unit dimensioned to store at least one container that holds one or more components associated with work flowing through said cell; and

a guided forklift truck that traverses said main aisle without requiring steering control of a stock handler operating said forklift truck to relocate containers from said storage units to designated ones of said station-aisle interfaces to trigger inbound workflows to corresponding ones of said plurality of stations, and to remove containers from said designated ones of said plurality of station-aisle interfaces when work is completed at said corresponding ones of said plurality of stations, wherein at least one of said plurality of stations comprises;

two conveyors, each having an end proximate to said station-aisle interface, wherein each conveyor has a platform that is tiltable such that when said conveyor is tilted in a first position, a container delivered by said forklift truck from said aisle to said platform is biased by gravity to move toward said station work area; and

when said conveyor is tilted to a second position, a container delivered from said station work area to said platform is biased by gravity to move toward said aisle for pickup by said forklift truck so that each of said two conveyors can be used to receive and return containers between said station work area and the station-aisle interface.

2. The manufacturing cell according to claim 1, wherein at least one station comprises:

an inbound conveyor having an end proximate to said station-aisle interface to receive containers delivered by said forklift truck from said aisle, said inbound conveyor further configured to move containers into a station work area;

an outbound conveyor having an end thereof proximate to said station-aisle interface to move containers from said station work area to said aisle for pickup by said forklift truck; and

a cross conveyor that bridges containers from said inbound conveyor to said outbound conveyor.

3. The manufacturing cell according to claim 2, wherein:

said inbound and outbound conveyors comprise roller conveyors; and

said cross conveyor comprises a roller ball table having a plurality of bearings thereon.

4. The manufacturing cell according to claim 1, wherein:

said guided forklift truck is guided by a wire guidance system that steers said forklift truck at least within said main aisle, and

said aisle has a width that is slightly wider than said guided forklift truck.

5. The manufacturing cell according to claim 1, wherein at least one of said plurality of stations further comprises an indicator that is controlled to identify a status of said at least one of said plurality of stations, wherein said indicator is under the control of a station operator to request assistance from said stock handler operating said forklift truck.

6. The manufacturing cell according to claim 1, wherein each said conveyor platform is pivotally mounted at a position between the ends of said conveyor platform.

7. The manufacturing cell according to claim 1, wherein each said conveyor further comprises a hydraulic lift coupled to said platform at an end opposite of said station-aisle interface, said hydraulic lift operable to tilt said conveyor platform.

8. The manufacturing cell according to claim 1, further comprising:

an inbound conveyor that is arranged to direct containers from outside of said manufacturing cell to an inbound area that is accessible to said forklift truck; and

an outbound conveyor arranged to direct containers toward a location outside of said manufacturing cell.

9. The manufacturing cell according to claim 1, wherein at least one station further comprises a mechanical manipulator that allows objects to be lifted and moved in two or more dimensions.