Abstract: A support structure of the kind used in supermarkets and other self-service shops comprises a series of slotted upright members 12 and brackets 16 which are connected to the upright members by having teeth which enter into the slots. Conductor tracks 36 extend along passages 32 in the upright members, and electrical contact with conductors carried by the conductor tracks is established by means of electrical connectors 48 having tongues 50 which enter into the passages through slots which are unoccupied by teeth.

Abstract: An electrical connector 48 for making electrical contact with a conductor track 36 through slots 44 in a channel 26 behind which the conductor track is disposed comprises a pair of tongues 50 which are able to reach through the slots. The tongues each carry conductor pins 114, 116 for establishing electrical contact with the conductor track. The tongues each further carry a jaw 166 which is displaceable in a direction transverse to that in which the tongues are inserted through the slots, between a retracted position in which it is retracted in the tongue and an extended position in which it protrudes laterally from the tongue and engages with the conductor track. Pin wedges 120 displace terminal portions 126 of the conductor pins to make electrical contact with the conductor track.