US1540080A - Line bar for crossbar line switches - Google Patents

Description

June 2, 1925. f

- A. c. MAGRATH LI`NE BAR FOR GROS'SBR LINE SWITCHES Filedoct. 15, 1920 Patented June 2, 1925.

UNITED.r STATES PATENT OFFICE.

AR'LHUR C. MAGRATH, 0F BROOKLYN, NEW YORK, ASSIGNOR TO VESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LINE BAR FOR CROSSBAR LINE SWITCHES.

Application filed October 16, 1920. Serial No. 417,428.

To all whom t may concern.'

Be it known that I, ARTHUR C. MAGRATH, a citizen of the United States, residing at Brooklyn, in the county oif Kings, State of New York, have invented certain new and useful Improvements in Line Bars for Crossbar Line. Switches, oit which the following is a full, clear, concise, and exact description. n

This invention relates to line switches of the cross bar type adapted for use in automatic telephone exchanges for establishing connections between subscribers lines and trunk lines extending to first selector switches. More particularly, the invention relates to line bars for use in cross bar switches.

The present invention has for its object, the provision of a line bar which may be produced at a relatively low cost and which, at the same time, is thoroughly reliable in operation.

Line bars made in accordance with the present invention are characterized by the absence of any screws, bolts, rivets or the like, in their embodiment. Instead of employing such media, the various metal part-s of the line bar are assembled together and held in their proper relationship by bein-f ,irmly embedded in molded parts of insulating material.

The accompanying drawing shows a per-V spective view of an assembled line'bar, some portions being shown in cross section.`

.Parts l, 2, 3 and 4l are flat metal conducting strips, each oit` which is provided with a plurality 0f lugs 5, the tunctionfof which is to make contact with terminals yol! the trunk bars which cooperate with these line bars to establish connections between sub` scribers lines and trunk lines. The four conducting strips 1, 2, 3 and 4 are firmly embedded in and insulated from each other by blocks of insulating material 6, 7, 8 and 9. Also embedded in each of the end blocks 6 and 9 respectivelyis a supporting elementk in the formof a U-shaped clevis l() which is provided with apertures 11 for engaging fulcrum pin 12.

The line bar is intended to be pivotally mounted on links 18 lwhich in turn are piv otally mountedl on brackets 14. Electromagnet l5 with its armature 16 is adapted to operate the line bar.

For a full description of the functions and method of operation of the line bar,

reference may be had to Patent No. 1,462,047

of July 17, 1923, to J. N. Reynolds.

lVhat is claimed is:

l. In combination, a plurality of parallel metallic strips, supporting elements therefor and a plurality of blocks ot insulating material into which said strips and said supporting elements are embedded.

2. In combination, a plurality of conducting strips, supporting elements therefor and a plurality of insulating blocks 'lor securing said elements on said strips.

3. In combination, a plurality of parallel and superposed metallic strips, a set of contacting lugs integrally formed with each of said strips, supporting elements therefor, and couplings of insulating material cast at the ends of said strips for securing said elements thereto.

4. A line bar comprising a plurality of parallel conducting strips, a molded insulator at each end of said line bar into which the ends of said conducting strips are embedded, and a U-shaped clevis embedded in each of said insulators, the extremities oit' said clevises projecting outwardly 'from said insulators.

5. A multiple electrical conductor cour prising a plurality of parallel conductors ARTHUR C. MAGRATH.

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