US 4,424,889 A · Phase break-section insulator devices of high tensile strength

Abstract

Phase break-section insulator devices for trolley contact wires of an overhead electrified railroad include parallel insulating rods joined up at their ends with two light weight crosspieces at each end. The rods have a glass fiber center surrounded by a tube of polytetrafluoroethylene, and this tube has grooves therein to prevent spread of moisture and dirt along the rod. Each rod end is joined to a metal sleeve, in turn joined to one of the end crosspieces. A contact wire clamp is secured between the two crosspieces at each end. A separate contact wire clamp adjacent each end of the device has current collector guides attached and extending along the device on opposite sides and also attached to the ends of the crosspieces. The crosspieces have openings for the contact wire and insulating rods to allow installation and adjustment of the device on the contact wire before this wire is cut. Similar crosspieces and guides may be used in the center section of a phase break. Supporting bars with weight reducing holes (as the guides also have) are attached to crosspieces for suspension of the device. Various guide, horn and arc extinguisher configurations are provided. Overlapping guides may be provided to provide no interruption of power when a current collector passes through a section insulator. Grooves may be provided all across insulating rods normally contacted by a current collector by adding an auxiliary current collector riding surface attached to the rods. Identical section insulator modules may be connected together by a grounded or ungrounded contact wire to provide a phase break.

Claims34

Dependent claims

A device for establishing an electrically insulating connection of high tensile strength between two sections of the contact wire of an overhead line, which device comprises:

two insulating rods of glass fiber which are located parallel to each other and side by side at a distance from each other and each of which is connected firmly on both ends with a coaxially located metal rod;
two first crosspieces placed above and across the contact wire, to which the two metal rods at one and the other end of each insulating rod, respectively, are firmly connected;
two first contact wire clamps for establishing a connection of high tensile strength between the two sections of contact wire and one and the other, respectively, of the two first crosspieces, which first contact wire clamps have means allowing placement on the contact wire from above;
two second crosspieces placed above and across the contact wire and located between the two first crosspieces, each second crosspiece being adjacent a first crosspiece to form a pair of crosspieces, with one first contact wire clamp being fastened between one first and one second crosspiece and the other first contact wire clamp being fastened between the other first and the other second crosspiece;
two pairs of guides, with the two guides of the one pair of guides being fastened to the one and the other side, respectively, of a pair of crosspieces, and the two guides of the other pair being fastened to the one and other side, respectively, of the other pair of crosspieces;
one of the two sections of each guide adjoining the segment fastened to the crosspieces extending laterally and at a distance from the nearest insulating rod and the other of these two sections approaching the contact wire and together with the corresponding end of the other guide of the pair, being connected at its end with the contact wire by means of a second contact wire clamp;
and,
the two second contact wire clamps having means allowing placement on the contact wire from above.

5 more elements

Dependencies are inferred from the claim text.

Phase break-section insulator devices of high tensile strength

Life of this patent

Phase break-section insulator devices of high tensile strength

Life of this patent

Abstract

Claims34