Electricity: transmission to vehicles – Collectors – Trolley
Patent
1993-04-01
1994-10-04
Huppert, Michael S.
Electricity: transmission to vehicles
Collectors
Trolley
191 591, B60L 508
Patent
active
053517946
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a current collector holder for a carbon shoe, which bears against a contact wire, for electrically driven vehicles, which holder has two first webs, which grip the foot region of the shoe, and two second webs, which project away from the shoe and are arranged underneath it, a separate spring system being provided which presses the second webs relatively towards one another and hence presses the first webs against the foot region of the shoe.
As a rule, the holder is connected to the current collector via side elements, so-called horns.
In the case of a known holder of this type (DD-PS 159,163), the spring system is formed by a plurality of spiral springs which act on the second webs at discrete points on the second webs, oriented transversely with respect to the longitudinal direction of the shoe. This construction is relatively complicated and its mass is very high. In addition, the forces do not act continuously over the entire length of the second webs, as a result of which stresses are caused in the carbon shoe. At the same time, the contact voltage drop between the carbon shoe and the holder is relatively high.
SUMMARY OF THE INVENTION
The invention is based on the object of constructing the holder mentioned initially in such a manner that it is simpler than that known and in such a manner that the spring forces act continuously over the entire length of the shoe.
This construction is achieved according to the invention in that a spring is provided as the spring system, which spring extends unchanged in the longitudinal direction of the shoe, bears against the second webs with longitudinal regions, and in this way transmits its spring force, which acts in the transverse direction of the shoe, to the second webs.
This construction is distinguished by simplicity. This has a favorable effect on production and allows the use of worn carbon shoes in a simple manner. In addition, the spring acts continuously over the entire length of the second webs. This leads to it being possible to hold the carbon shoes with forces which remain constant in the longitudinal direction, in a manner which is simpler than in the known case, which, as a result of the specific brittleness of the carbon shoe, is better than retention of the same with forces which act differently in the longitudinal direction. In addition, the electrical contact resistance from the carbon shoe to the holder is then constant and smaller over the entire shoe.
It should be mentioned that it is already known for carbon shoes to be held with forces which act continuously in the longitudinal direction. Thus, it is known (AT-PS 209,376) for rubber strips to be provided between the first webs and the carbon shoe. The surfaces separated by the rubber strips do not contribute to making electrical contact. The rubber strips are subject to severe ageing effects. In addition, it is possible to transmit and produce only limited forces using these rubber strips. Furthermore, it is known (AT-PS 342,117 and DE-OS 2,138,459) for the holder itself to be constructed in a sprung manner in specific regions in order to produce the retention forces for the carbon shoe. For this reason, it is not possible to take optimal account of all situations in this way, as in the case of the solution according to the invention in which the holder and spring system are separate from one another.
A development of the invention is for the spring to form an open figure in the transverse direction of the shoe, which figure is curved on one side, has two mutually opposite edges, grips the second webs and presses them against one another. In the case of shoes which are bent transversely with respect to the contact wire, the spring is additionally provided with the radius of the holder. However, it is also possible for the spring to be provided with transverse slots which end shortly in front of the edges.
At the ends, the spring may have holes into which hooks can be inserted, by means of which the springs can be pulled out of the s
REFERENCES:
patent: 2221611 (1940-11-01), Schaake
patent: 2229810 (1941-01-01), Leuchs
patent: 2305297 (1942-12-01), Leuchs
patent: 2388123 (1945-10-01), Conradty
Huppert Michael S.
Lowe Scott L.
Stone Mark P.
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