Geometrical instruments
Patent
1982-12-22
1985-01-15
Abrams, Neil
Geometrical instruments
339 33, H01R 2514
Patent
active
044935161
ABSTRACT:
A ducting system comprising ducts of mainly U-shaped cross-section with bare hollow conductors fitted at the inner surfaces thereof, which conductors are accessible for corresponding contact pins of a contact element to be locked in arbitrary points on the open side of a duct, auxiliary parts being used for interconnecting such ducts and connecting a duct with a current supply. The improvement is that the conductors each consist of a continuous elastic metal strip bent into a mainly closed tube with oppositely bent outer rims, which conductors are retained in an insulating and non-rotatable manner in interior channels having a narrow access slot allowing a contact pin to be inserted through a slot into the narrow opening of the conductor in question between the outwardly bent outer rims, the adjacent bends of the conductor then being lateraly displaced so as to clamp the sides of the contact pin under spring tension and to make electrical contact therewith, interconnecting pins being used for interconnecting corresponding conductors of aligned ducts or a conductor of a duct and a corresponding conductor of an auxiliary part, these pins having a diameter which is larger than the smallest diameter of a hollow conductor in the unstressed state, so that such a pin, when inserted axially into the extremity of a conductor will be elastically clamped by inner wall portions of the conductor making electrical contact therewith.
REFERENCES:
patent: 1805572 (1931-05-01), De Mask
patent: 1869145 (1932-07-01), Greis
patent: 2317964 (1943-04-01), O'Brien
patent: 3546367 (1970-12-01), Hart et al.
patent: 3900240 (1975-08-01), Bertrams et al.
patent: 4105099 (1978-08-01), Bertrams et al.
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