Abstract:
391,118. Spring upholstery. ROBBINS, R. W. J. and ELSON & ROBBINS, Ltd., Canal Street Mills, Long Eaton, Derbyshire. Oct. 14, 1931, No. 28554. [Class 52 (iv).] The end coils of upholstery springs assembled in rows are secured by clipping together the springs of adjacent rows, there being interposed between the springs a substantially rigid sound-deadening element 2, preferably a papercovered wire. Similarly constructed border wires 2 may also be provided for the peripheral springs.
Abstract:
185,163. Robbins, R. W. J. May 17, 1921. Mattresses and cushions.-Coil or helical springs 10 are secured to one or both of uninterrupted woven wire surfaces 11 by threading the uppermost coil or spiral turn of each spring 10 through the loops of the wire fabric sheets, as shown in Fig. 2; or, instead of threading both ends in this manner, one end of each of the springs 10 may be connected together as shown in Fig. 4, in which the outermost coils at the lower ends of the springs 22, 22 are connected by diagonally-arranged tie wires 18, 19 formed of a plurality of strands, the tie wires being coiled together at 27 between points of connection to the springs, and finally connected to an outer enclosing frame. In the arrangement shown in Fig. 2, first one end of the coiled spring is threaded into the wire fabric and then the spring is turned back to thread the other end into the fabric. The springs are secured against displacement by bending the ends 15.
Abstract:
184,497. Robbins, W. S., and Robbins, J. Feb. 5,1921. Tunnels.-Tubular, arched, and like structures, such as tunnels, culverts, sewers, and arches, are formed of spaced sectional ribs 6 of pre-cast concrete and concrete slabs 12 fitted between the ribs and interlocking therewith, the outer face of the wall or walls so formed being covered with concrete &c. 13. The rib sections are connected by fish-plates 10, dowels, or the like. Rods 11 hold the ribs in spaced relation and may be withdrawn as the work proceeds. The ends of the slabs are bevelled to engage bevelled surfaces of the ribs, and the sides of the slabs have bevel, dowel, or other engaging means. The top slab is longitudinally divided. The structure may have an inner lining of concrete &c. In a modification, Fig. 5, an inner lining 14 of glazed bricks extends through half the structure, the half-ribs being then of different radii, feet 15 facilitating connection.
Abstract:
A thermoforming trim press has one or more connecting arms for driving a movable platen, each arm having a pivotal connection between two adjacent sections of each connecting arm which is normally locked during normal press operation whereby the movable platen is able to move further back from a normal retracted position to increase the available clearance when changing or maintaining tools mounted on the movable platen. The pivoting ability of the connecting arm sections also simplifies adjusting the stroke of the press. A counterweight may be driven by the crank pins to match the press stroke adjustments and to thereby correspond the movement of the counterweight to the movement of the movable platen.
Abstract:
A thermoforming trim press has one or more connecting arms for a movable platen which each have a pivotal connection between the adjacent ends of two adjacent sections into which each connecting arm is divided. The pivotal connection is normally locked to keep the sections in end to end alignment during normal press operation, but can be released to allow pivoting between the sections to be able to draw the movable platen further back from the normal retracted position to increase the available clearance when changing or maintaining tools mounted on the movable platen. The pivoting ability of the connecting arm sections also simplifies adjusting the stroke of the press while this is normally done by relocating a crank pin on flywheels driving the connecting arms. The change of position does not affect the movable platen when the arm sections may pivot with respect to each other allowing relocating the crank pins to adjust the stroke without requiring disassembling of the crank pins. A counterweight may be driven by the crank pins to match the press stroke adjustments and to thereby correspond the movement of the counterweight to the movement of the movable platen.
Abstract:
The present invention concerns tunable distributed Bragg reflector (DBR) semiconductor lasers, in particular a DBR laser with a branched optical waveguide 5 within which a plurality of differently shaped lasing cavities may be formed, and a method of operation of such a laser. The laser may comprise a phase control section (418), gain section (420, 422), a sampled grating DBR (412) giving a comb-line spectrum and two tunable, chirped DBRs (414, 416) for broadband frequency training and a coupling section (410).