Abstract: A collapsible support frame for a receptacle comprising a frame of generally rectilinear configuration including opposed spaced apart front and rear frame portions connected together with opposed spaced apart side frame portions such that the side frame portions in the regions of the opposed front and rear frame portions respectively present downwardly projecting surface engaging formations of like extent, the disposable receptacle including opposed front and rear panels and opposed side panels terminating lowermost in a bottom panel and having a perimetral extent so as to be disposable within the collapsible support frame, the opposed front and rear panels and opposed side panels having a vertical extent exceeding that of the downwardly projecting surface engaging formations of the collapsible support frame and having a perimetral extent so that when the opposed front and rear panels and opposed side panels are folded over the opposed spaced apart front and rear frame portions and opposed spaced apart side f

Abstract: A hollow module useful for a retaining wall structure or the like defined by an upstanding surrounding wall formation presenting front, rear and opposed side faces and having generally planar upper and lower surfaces and a substantially constant wall thickness throughout the extent of any given face, the lower planar surface in the regions of the opposed side faces presenting at least a pair of opposed depending lug formations projecting therebelow of dimensions such that when measured in the front to rear direction the extent of same are always less than the front to rear extent of the opposed side faces so as to define with the lower planar surface recess formations for selective registration over the upper planar surfaces of other like or compatible modules whereby such modules are selectively interlockingly interengaged; and wherein suitable slabs are provided with depending lug formations projecting therebelow for disposition upon upper planar surfaces of such modules with the lug formations projecting t

Abstract: An interlocking block and a retaining wall system derived from such blocks wherein the blocks when arranged to extend in horizontal courses in end to end relation and one upon the other in interlocking overlapping wall defining relation automatically uniformly incline to the vertical, such interlocking block having an axis terminating in spaced apart end walls and bounded by generally flat top and bottom walls arranged in parallel relation to each other and by front and rear facings extending from end wall to end wall and so spaced apart as to provide a substantially uniform cross-section throughout the axial extent of same, the block having an axially extending projection upstanding from the top wall and the bottom wall having an axially extending recess formation of a configuration and extent to match the projection, the projection being spaced inwardly from the front facing to present an uninterrupted flat top wall portion therebetween and rearwardly in relation to the axis a selected extent exceeding that

Abstract: A collapsible chair that includes a front pair and rear pair of crossed, pivotally interconnected legs having a common pivot axis extending from front to rear, seat-supporting rails extending between the pairs of legs front to rear at each side with such seat-supporting rails secured to the uppermost portion of each leg and inwardly thereof, unitary armrest and backrest supporting structure extending between the pairs of legs front to rear at each side by pivots securing same to the uppermost portion of each respective leg only, so as to be swingably separable from the adjacent inner seat-supporting rail and to move into substantial upstanding abutment thereagainst in chair-defining relation, with each unitary armrest and backrest supporting structure including a reinforcing member projecting inwardly thereof moving into and out of overlying engagement with the uppermost surface of the adjacent inner seat-supporting rail.

Abstract: In the method of welding open web steel joists a chord member is formed by bending a web in an undulating configuration. The chord is welded to the webs by simultaneously clamping and resistance welding to form four welds. The weld current is applied by a series of time controlled intermittent impulses of electrical current. The weld electrodes used are of unequal resistance so as to balance the heat generated.

Abstract: In an electric resistance welding machine for welding structural members together along a common region of contact through the intermittent application of heat generating electrical energy to said region of contact the combination of; electrode means adapted to releasably contact and clamp said members together so as to exert an external force to said members for urging said members together at said regions of contact, and to transmit and apply said electrical energy to said members in said region of contact on an intermittent basis, transformer means associated with said electrode means for supplying said electrical energy to be intermittently applied to said members in said region of contact, control means for controlling the intermittent application of said electrical energy to said region of contact for a selected timed interval, including means for interrupting said application of said electrical energy for a selected timed interval so as to present a series of intermittent impulses of said electrical en

Abstract: This invention relates to environmentally sound hydrometallurgical methods and processes for extraction of cobalt, nickel and silver from complex concentrates. The finely ground minerals are converted during an oxidative caustic leach at elevated pressures and temperatures to insoluble metal hydroxides and are separated from soluble sodium arsenate and sodium sulphate. Cobalt and nickel are extracted from the caustic cake during a two-stage sulphuric acid leach. Solution purification for cobalt and nickel recovery proceeds on the basis that only one waste residue and one liquid effluent are generated which meet strict environmental standards. A small amount of cyanidation residue is generated after silver extraction by cyanidation from the acid leach residue. Metal values extraction reaches +99.0%. Arsenic and sulphur can be recovered in an innovative recycle system as sodium, zinc or copper arsenate chemicals and as anhydrous sodium sulphate.

Abstract: Apparatus for fabricating metal trusses having spaced preformed chord members of generally longitudinal predetermined length and cross-section joined by at least one preformed supporting web member of predetermined length and cross-section by electrically resistance welding together the chord and web member at a common region of contact with the chord member having a smaller cross-sectional area than the web member at the common region of contact. A device includes in to place a station for cleaning the chord and web members, means for moving the clean chord and web members to an assembly station for assembling the chord members in spaced relation joined by the web member. A device for passing the assembled truss along a support to the electrical resistance welder having opposed first and second electrodes of unequal resistance and adapted to releasably clamp the chord and web members respectively at the common region of contact.

Abstract: A device for non-destructively simultaneously testing the shear strength of at least four welded joints presented by a metallic truss having two spaced substantially parallel chord members joined together by a substantially coplanar web member bent into a substantially uniform undulating configuration between the chord members so as to present a series of alternate opposite apices at the bends welded to the spaced chord members respectively along regularly spaced intervals longitudinally of the chord members, the device including; elements for simultaneously clamping the chord members in at least four positions adjacent the welded joints, including elements for eliminating the twisting of the welded joints from the plane defined by the web member during the simultaneous clamping, and elements for simultaneously applying a substantially perpendicular force relative the plane defined by the web member, for a selected timed interval, to at least four of the apices defined by the bent web member, adapted to test

Abstract: The invention relates to improvements in collapsible binders and the like, which are self-sustaining in a predetermined configuration when unfolded and extended to sit upon a flat surface, such a binder presenting an elongated central panel flanked by a pair of generally quadrilateral flanking side panels with a rearwardly located collapsible support having an upstanding elongated rear central panel flanked by a first pair of upstanding rear-side panels of substantially right-angled triangular configuration the later side panels terminating along their respective hypotenuses remote from said upstanding rear central panel in a second pair respectively of flanking side panels extending in coplanar relation behind the flanking side panels of said binder, and slidingly fixed thereto; and with all panels being so hingedly connected together that the structure may upon being unfolded extend into its self-sustaining predetermined configuration and may be compactly folded up when collapsed for storage or for carrying