Conveyors: power-driven – Conveying apparatus entirely supported by mobile ground...
Reexamination Certificate
1998-11-25
2001-02-13
Kramer, Dean J. (Department: 3652)
Conveyors: power-driven
Conveying apparatus entirely supported by mobile ground...
C198S306000, C198S313000
Reexamination Certificate
active
06186311
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to conveyor systems for stacking bulk materials and, more particularly, to such conveyor systems that are readily transportable from site to site.
PRIOR ART
Material, such as stone, rock or demolition material, is regularly crushed and screened into aggregate products. Crushing equipment is often moved from location to location as the need changes. Mobility is a necessity where equipment is used for crushing demolition materials on site. Because of seasonal high demand, equipment failure or other reasons, there can be a need to temporarily operate portable equipment at permanent installations such as at a stone quarry, for example.
In crushing operations for rock, stone, concrete or the like, generally, at least two products are made. Such products can be, for instance, fines and a certain screen size. For each product coming off the screen section of the crusher plant, a conveyor circuit is frequently necessary to move the product away from the screen discharge and, normally, stack it on storage piles.
The transport and erection of known portable stacking conveyors has involved substantial time, labor and shipping costs for transport, assembly and disassembly. The typical prior art stacking conveyor had to be transported separately on a highway trailer and often required a crane to unload it, set it up for operation, and later take it down when a job was completed. Consequently a large part of the cost of a job was incurred for equipment transportation and for set up and take down work not associated with production.
SUMMARY OF THE INVENTION
The invention provides a self-transporting and self-erecting conveyor system. In the illustrated embodiment, the system comprises four conveyors that are transported as a single trailer load drawn by a conventional highway tractor. The conveyor includes two stacking conveyors and two transfer conveyors. The disclosed conveyor system can be conveniently set up and later taken down using available material handling equipment such as a loader. The invention, thus, avoids the scheduling and expense of a mobile crane often required with prior known systems.
Each stacking conveyor folds on itself on a horizontal axis to reduce its length for transport. The hinge folding point for each stacking conveyor is arranged so that an area above a main section of the frame is reserved for receiving an associated transfer conveyor for transport purposes. The stacking conveyors are proportioned to lie side by side for transport. The tail or material receiving end of each stacking conveyor receives a common pin that simplifies coupling of the stacking conveyors for transport.
Each of the stacking conveyors is fitted with a separate axle and wheel set for road transport and to enable sideways movement for stacking a kidney shaped pile. The wheels are pivotal on the axles to convert from the transport mode where travel is longitudinal to the operational mode where the motion is side to side or radial. The stacking conveyors each have separate self-contained hydraulic power packs that are used for erecting and, alternatively, retracting various parts of the conveyor for operation or for load transport. Additionally, the power pack can be used to drive the wheels to produce side to side movement of the conveyor.
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Chin Paul T.
Kramer Dean J.
Ohio Machinery Co.
Pearne & Gordon LLP
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