Patent GB-889810-A (GB)
Title: Improvements relating to distribution frames and to jack assemblies and plug assemblies adapted for use in constituting such frames
Inventor: ROGERSON LESLIE CHARLES
IPC: H01R13/26
Filed: 1958-12-03
Abstract: 889,810. Exchange apparatus. ASSOCIATED INDUSTRIES Ltd. Dec. 1, 1959 [Dec. 3, 1958], No. 39014/58. Class 40 (4). In an assembly of jacks, two jacks (Fig. 3) consist of a pair of similar subassemblies (Fig. 4) clamped together with their corresponding faces in contact, each of which sub-assemblies comprises an insulating moulding 12 carrying a plurality of contact members each having an integral terminal tag 9, each jack including some contact members of each subassembly and the arrangement being such that when it is viewed from the front the tags 9 of the contact members of one sub-assembly protrude from one side face of the assembly and those of the other subassembly from the other side face. The moulding 12 may be formed of a phenolic plastic and the contact members from nickel-silver contact spring material. The contact members (13A to 13D for the lower sub - assembly and 13AA to 13DD for the upper) each have a contact-making portion 45 and a terminal portion 46 ending in the tag 9. A contact member is assembled on an insulating moulding 12 by passing the terminal portion 46 in the appropriate direction through the relevant one of four holes 14 with the terminal portion held towards the front edge of the hole. The terminal portion is then brought to lie almost flat on the moulding, and finally the contact member is moved backwards to locate the portion 46 in a groove in the moulding and the rear end of portion 45 in a slot 15 in the moulding, the curved front end of portion 45 lying round the front edge of the moulding. The two sub-assemblies are assembled by engaging the locating pin 16 of each in the locating hole 17 of the other. An assembly twenty such pairs of jacks is made by passing bolts through the holes 18, insulators 47 (Fig. 3) being interposed between each pair of subassemblies, between the bottom sub-assembly and a bottom end-plate, and between the top sub-assembly and a top end-plate (see below). Identification labels fit into the slots 48 (Fig. 3), formed by the grooves 19 in the mouldings 12 (Fig. 4). Distribution frame using the jack assemblies (Figs. 1, 2 and 8).-Each of the line-side jack assemblies 1A and each of the exchange-side jack assemblies 1B comprises forty subassemblies 35 clamped between end-plates 2A or 2B by two bolts 3 and two nuts 36. The endplates 2A extend forwardly of the front faces of the sub-assemblies to form hoods 52 (Fig. 1), for protecting fuse-carrying plugs plugged into the line-side jacks. Each assembly 1A includes two angle brackets 4A which are bolted to a triangular bracket 5 which is in turn bolted to a horizontal member 37 (Fig. 8), of the framework of the distribution frame. In the case of assemblies 1B each assembly includes two angle brackets 4B which are bolted to two horizontal members 37 of the frame. The external and internal connections are terminated on the tags protruding from the lefthand side (viewed from the front) of the lineside and exchange-side assemblies, respectively, and a two-wire jumper is run from the lineside assembly 1A horizontally along the line side of the frame to the point at which is situated the vertical member 40 carrying the relevant exchange-side assembly 1B, is then run through to the exchange-side of the frame, and is finally run vertically to that exchangeside assembly 1B. Normally the line-side jack of a connection has plugged into it a fusecarrying plug (as at 43), and the exchange-side jack a so-called shorting plug (as at 44) giving a direct connection between the in and 'out contact members of the jack. Plugs.-Each fuse-carrying plug (Fig. 5) consists of an apertured flat member 20 of a phenolic plastic having a tongue portion 49 for entry into a jack, to an extent which is limited by shoulders 51 on the remaining portion 50. Four similar contact spring members 23A (not shown) to 23D are mounted on the tongue portion 49 in two pairs, each pair being secured by two rivets 24 of insulating material. Two fuses 21A, 21B lie in apertures 53 in the portion 50 and are held in position by the wires 22 which connect them to the tags 54 of the relevant contact spring members. Each shorting plug (Fig. 6) comprises an apertured flat member 26 of phonolic plastic having a tongue portion 57 entry of which into a jack is limited by shoulders 59. It carries two similar contact members 27A, 27B, each secured by a metal rivet 60, which are located by the subsidiary tongue portion 61 and by the engagement of tabs 62 with apertures 63 in the member 26. An alternative form of fusecarrying plug using clip-in fuses is described with reference to Fig. 7 (not shown). A test plug may be of the same general form as a fuse-carrying plug, but has, instead of the fuses, four terminals to which the four conductors of a test card may be connected, the terminals being integral with, or connected to, the respective contact spring members of the plug.