Patent GB-190411920-A (GB)
Title: Improvements in and relating to the Manufacture of Electrodes for Electric Accumulators.
Inventor: BRUNO CARLO
Filed: 1904-05-25
Granted: 1905-08-25
Abstract: 11,920. Bruno, C. May 25. Tools ; bending ; flanging.-The electrodes of electric accumulators are formed from suitable blocks of metal by special tools which first cut from the interior or exterior of the blocks flanges or wings, and then gradually turn them up so as to form circular, helical, straight, or other flanges, and produce electrodes of large surface and capacity. Examples of electrodes which may be produced are cylindrical or other plates with helical or longitudinal flanges upon either their inner or their outer surfaces, or upon both. In the form shown in Fig. 36<a>, helicoidal wings are produced upon rods 2 formed on faces 3, and are then turned into the plane of the electrode as shown. In another example, shown in Fig. 37, a number of internal helicoidal wings are formed in a block. The thickness of the electrode is less than that of the wings, so that passages 5 are formed. The upper and lower ends of the wings are left thick to strengthen the electrode. An electrode having a number of internal helicoidal wings provided with central holes, in which are placed rod electrodes of opposite polarity, is a simple form of block accumulator. The blocks may be grooved longitudinally, discontinuous wings being then formed as shown in Fig. 25. The outer and inner edges of the wings may differ in thickness to allow for expansion when external wings are turned up. The tools used are such that the cutting-edges and surfaces at one side thereof correspond in shape to the cuts to be made in the blocks. The other surfaces are curved so as to lift the strips severed partially from the blocks into the positions required. The tools may be arranged, and the blocks cut, in a turning-lathe or the like. Fig. 15 shows a tool adapted to form a helical internal flange in a hollow cylinder having originally a truncated conical recess at one end. The outer surface of the tool is of the shape formed by giving simultaneously to the edge 1-20 a rotation round and a movement along the line 5-5. The inner surface is formed by giving to the edge 1-20 a vertical angular movement in the plane of the line 5-5 around its end 1 so that it takes up finally the position 49-5. If the movements of translation be dispensed with, the tool produced will form circular flanges. By varying or accelerating the rates of movement in different directions with relation to each other, the lifting-surface of the tool produced may be arranged to lift the strip either faster or slower or with a gradual acceleration. The edge of the tool may be acute, obtuse, or at right-angles to its path. In the former case, it tends to increase the width of the flange produced by it. If the angle of the cutting-edge be increased or decreased, the flange produced will be thicker at the top or bottom respectively. Similar effects are produced by making the edge 1-20 convex or concave. If the angle be large, alternate flanges may be removed. To obviate friction, the outer surface of the tool may approximate in shape to its inner surface, the edge 1-20 may be turned slightly outwards, or portions of the back of the tool may be cut away. The cutting-edge may be carried by a rod introduced through the central bore of the tool. Fig. 24 shows a tool adapted to form straight flanges. It has two cutting-edges 6-4 and two lifting-surfaces, and is moved sideways.