Patent GB-1006862-A (GB)
Title: Improvements in or relating to electrical indicating and recording instruments
IPC: H05K7/16
Filed: 1961-08-21
Abstract: 1,006,862. Indicating-apparatus; instrument casings. HONEYWELL Inc. Aug. 21, 1961 [Aug. 23, 1960],No.30120/61. Headings G1J and G1Q. [Also in Divisions F2,H1 and H2] A case of an electrical indicating or recording instrument comprises a chassis 22 slidably mounted in the case 1, electric cables interconnecting fixed terminals in the case and moving terminals on the chassis and an articulated conductor bridge 34 enclosing and protecting portions of the cables and pivotally connected to the case and to the chassis so as to fold and unfold as the chassis slides in the case. Front and rear frames 3, 4, preferably of cast aluminium, are spaced by mouldings of extruded aluminium with the rounded ends of side panels 7 and top and bottom panels 8 fitting therein. Connecting rods 9 with nuts 10 secure together the frames 3, 4 which are closed by a pivoted door 2 and screwed rear panel 25. The chassis 22 is mounted by means of axles 23 and rollers 24 on movable slides 14 spaced from fixed slides 13 by balls 15 in cages 16. Elastic buffers 21 engage fixed abutments 17 to define the innermost position of the chassis. The bridge 34 is formed in three sections, a rear section 36 mounted on the case by a pivot 38 in a bracket 35, a front section 64, 65 mounted on the chassis 22 by a pivot 68 in a bracket 69 and a middle section 40, 41 connected to the rear section by a pivot 39 and secured to the front section by upper and lower connectors 44, 52 releasably fastened together and including electric couplings for joining rear and front cables 70, 71. The rear cables 70 are connected to stationary contacts 29, 33 on an insulating panel 27, are trained round the pivots 38, 39, and then enclosed between front and rear portions of the middle section 40, 41 to terminate in contacts in the upper connector 44. The front cables 71 are connected to the various electrical components of an indicating and/or recording instrument mounted on the chassis 22, are trained round the pivot 68 and then enclosed between front and rear portions of the front section 64, 65 to terminate in contacts in the lower connector 52. The connectors 44, 52 comprise sockets 45, 53 of insulating material each with a pair of ridges 46, 54 which fit into slots 42, 66 in the front and rear portions of the middle and front sections 40, 41; 64, 65 of the bridge 34. Upper and lower connectors 44, 52 for releasably fastening together sections 40, 41; 64, 65 of a conductor bridge 34 and for electrically coupling cables 70, 71 comprise sockets 45, 53 of insulating material each with a pair of ridges 46, 54 which fit into slots 42, 66 in front (40, 64) and rear (41, 65) portions of the two sections of the bridge 34. Male jack screws 57 are located in holes in the lower connector 52 and comprise headed bushes 58 with shoulders 59 and central holes. Pins 60 with screw threads 61 and shoulders 62 are located in the bushes 58 and are connected thereto by pins 63 so that the screws 57 are held captive in the connector 52. Female jack screws are held captive in holes in the upper connector 44 by their shoulders 74 and nuts 76. They are formed with internally threaded sockets 73 which receive the threaded pins 60 and thereby clamp the connectors 44, 52 together. The sockets 45, 53 carry contacts 47, 55 with holes to receive the ends of the cables 70, 71 and aligned holes to receive pins 49. Upper, split ends of cylinders 50 surround the lower ends of contacts 47 while lower, split ends of identical cylinders 50A surround the upper ends of contacts 55.