Abstract: A connector for optical fibres comprises two subassemblies, one subassembly comprising at least one tubular member the rear part of which fits on a coated fibre and the front part of which receives a connector element. The other subassembly includes at least one tubular connector element, the rear part of which fits on a coated fibre and the front part of which is a close fit on an uncoated fibre. On assembly of the two subassemblies, the connector element slides into the front part of the tubular member of the first subassembly. The ends of the uncoated fibres abut at about a mid position in the connector element. For a connector for multiple pairs of fibres, a plurality of tubular members are provided in one subassembly and a plurality of connector elements in the other assembly. Means can be provided for resiliently positioning one or the other or both of the tubular members and connector elements axially to permit axial movement on assembly to allow for manufacturing tolerances.

Abstract: Two optical fibres are connected in end to end relationship by positioning the fibres in a tubular connecting member, the member having a preformed section which has a number of lobes formed in the tube, the radially inward extremities of the lobes defining an axial bore into which the uncoated ends of the fibres can slide. After positioning the fibre ends in the preformed section the plastic coating of each fibre is gripped by crimping the tubular member. For a splice both coated fibres are crimped into a single tubular member. For a releasable connector two tubular members are used, one incorporating the preformed section, and the two tubular members each crimped on to a fibre, the two members held together.

Abstract: A tool for preforming a section of a tubular connector, the connector used for joining two optical fibres in end to end relationship. A plurality of forming members extend radially in a holder and spaced circumferentially around the tubular member support means supports a mandrel in the bore of the tubular member, coaxially thereof, and cams push the forming members radially inward to form a plurality of lobes in the section of the tubular member. The radially inward extremities of the lobes are pushed into contact with the mandrel to define a central bore for reception of the uncoated ends of the fibres. The forming members having a Vee formation with an inclined face at each end of the Vee formation.

Abstract: A connecting block in which a support member has a large number of terminal clips extending through the member, for connection of wires to both ends, the support member pivotally mounted in a housing so that one or other side of the support member, and related ends of terminal clips, can be selectively presented for wiring. A hinged cover attached to the support member can be utilized to retain the support member in one selected position, the support member normally positioned in the other position, as by gravity.