Railway rolling stock – Special car bodies – Dumping
Patent
1997-06-26
1998-10-20
Le, Mark Tuan
Railway rolling stock
Special car bodies
Dumping
105299, 105240, B61D 700
Patent
active
058231188
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bottom discharge arrangement intended for mounting to a goods containing space, preferably a goods container of an ore-transporting railway truck.
2. Description of the Prior Art
Known bottom discharge arrangements include so-called sliding flaps supported by carrier arms which in manoeuvering the sliding flaps are able to pivot about a journal pin located above a respective flap and preferably extending in the longitudinal direction of the truck. As the sliding flaps are manoeuvered, they swing laterally to the transverse direction of the truck and upwards, such as to describe a circular arc whose centre lies in the pivot axis. When opening and closing the sliding flaps will move along the truck periphery to a position on one side of the discharge opening, spaced from the journal pin. This solution is unsatisfactory, because the sliding flaps cannot be opened very quickly and because ore tends to collect on the flap surfaces and therewith prevent the truck from being emptied completely and/or makes subsequent closing of the flaps difficult to achieve. Furthermore, sliding flaps that are mounted in this way are unable to contribute towards guiding the flow of discharged goods into an offloading bin placed beneath the truck and between the wheels thereof.
In order to achieve a well-functioning and quick-operating bottom discharge arrangement in bottom-discharge ore carrying trucks, or bogies, there is a desire to use flaps which have the form of so-called drop flaps, i.e. flaps which when moved to their respective opening and closing positions do not follow a path along the periphery of the truck to a position on respective sides of the discharge opening, but flaps whose mutually remote edges are pivotally mounted on the bottom of the goods container and which can therefore be swung rapidly to an open position in a plane perpendicular to said edges. When closed, these flaps together form a continuous bottom surface against which the ore rests, and when open form a continuation of the mutually opposing wall parts of the goods container located above the flaps and therewith function to guide the ore down into the underlying bin.
It has been found convenient to use for manoeuvering the flaps of bottom discharge arrangements of ore-carrying trucks, or bogies, an eccentric mechanism which is able to lock the flaps in their closed position when moved to an "overkneed" position about a rotational centre.
U.S. Pat. No. -A-3,316,859 and U.S. Pat. No. -A-3,611,947 illustrate examples of bottom discharge arrangements that include an eccentric mechanism which takes a so-called overkneed position when the flaps are closed. It will be seen, however, that the flaps of these known bottom discharge arrangements are not drop flaps but sliding flaps, i.e. flaps which are carried by support arms and which are pivotal about a journal pin mounted above each flap. With this type of flap, no serious problems occur as a result of the negative forces that are generated in the manoeuvering mechanism by the weight of the goods being carried when the flaps are closed, because the weight of the ore is taken up essentially by the journal pins located above respective flaps and not by the flap operating mechanism as in the case of drop flaps.
U.S. Pat. No. -A-3,611,947 teaches a bottom discharge arrangement which includes a pair of drop flaps which are pivotally mounted on the goods container at their mutually remote edges and operated by means of a link system which is common to both flaps and which includes an eccentric mechanism in the form of a two-arm lever pivotally mounted between the flaps. Each end of the lever is pivotally connected to a respective flap by means of a link arm. The eccentric mechanism is in an overkneed position when the flaps are closed. With the intention of eliminating the problem of overcoming negative forces when unlocking the operating mechanism, the mechanism is constructed so that in the initial unlocking movement th
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patent: 5249531 (1993-10-01), Taylor
Le Mark Tuan
Lezdey John
Luossavaara-Kiirunavaara AB
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