Патент USA US2129868код для вставки
Sept 13, 1938. A. PEARSON 2,129,868 ARTICLE SUPPORTING RACK FOR PLATING' Filed Oct. 3, I936 ?ll/?lial? . . A. P£ARso/v 8* #Q Mm ATTORNEY ,n, Patented Sept. 13, 1938 1 2,129,868 ' ARTICLE SUPPORTKNG RACK FOR PLATENG Albert Pearson, Western Springs, 111., ‘assignor to Western Electric Company, Incorporated, New York, N. Y, a corporation of New York Application October 3, 1936, Serial No. 103,872 "' . 3 Claims. (Ci. 204-5) A bracket H is welded to each end of the rod and fastened to the main frame member with This invention relates to article supporting racks, and more particularly to racks for plating sheet metal. _~ . ‘ Certain articles ‘require a localized coating and screws. . A continuous sheet is of ?bre, rubber or other 5 it is often desirable to restrict the covered areas, insulating material, equal in width to the length of the conductor rod is mounted around the outer as gold or other noble metals are employed. In some cases it is desirable to coat one side of a ends of the frame cross arms and secured thereto with countersunk screws it. The two ends of particularly when costly coating materials such metal sheet and subsequently to form the com the sheet abut against the portions of the rod improved method and rack for use in the applica (not‘shown) to the main member. The project ing portions of the half round rod are made equal ‘projecting beyond the face of the main frame 10 10 posite sheet into the article. member and are anchored securely with screws . An object of this invention is to provide an tion of a localized coating on sheet material. In accordance with. one embodiment of the to the thickness of the sheet to insure a smooth 15 invention, a rack is provided for supporting a ‘ continuous surface at the junctures between these ' metal strip in a plating apparatus and localizing members. At the bottom of the rack, the sheet the deposit of metal on one face thereof. vThe , nests against the rounded portion of the main rack comprises'a continuous surface having an frame member and the rod and sheet thus col oval section on which the strip is wound spirally 20 and clamped to prevent contact between the elec ' trolyte and the under surface of the strip. Plat ing current'is conducted to the strip through a contact bar along the top of the rack. ' A vcomplete vunderstanding of the invention 25 may be had from. the following detailed descrip ' tion taken in conjunction with the appended drawing in which the single ?gure is a perspective view of a plating rack embodying the invention. For convenience and economy a plating rack 30 embodying the invention is adapted for use in a conventional electroplating apparatus in which the rack is suspended from a. his bar ID in an electrolyte _(not shown). As shown in the drawing, a supporting‘ frame 35 made of wood, ?bre, or other insulating material comprises - a ' main rectangular vertical frame member H which has a rounded bottom portion I2. A plurality of cross members or- arms extend horizontally and symmetrically 4 from the two ' faces of the main member at right angles thereto. A central cross arm I3 is supported at the ap proximate middle of each face of the main mem ber. Two upper cross arms l4 ‘and two lower cross arms l5 mounted near‘the respective ends .45 ' 20 To each end of the half round rod a formed arm 20 of brass, copper or other conducting mate rial is secured by welding, brazing, or other suit able method, such as threading the arm into the rod to provide a good electrical contact for con-‘ 25 ducting plating current to the rod. The two arms extend upwards and are each provided with a hook'2l for engaging the bus bar of the plating apparatus and a handle 22 for convenient trans portation of the rack. . 30 At the upper left corner of the rack just below the conductor rodis a clamp 23 threaded in the main frame member and provided with an en larged head of rubber or other non-conducting ' material. A similar clamp 24 is mounted on the rear right face of the rack. ‘ Y ' In loading the rack one end of the metal strip 25 is anchored under the left hand clamp. The strip is then wound spirally on the surface of the ' rack and the conductor rod under su?icient ten 40 sion to insure close contact between the underside of the strip and the rack surface. The terminating end of the strip is fastened securely with the I ‘right hand clamp to hold the strip and rack in 45 proper vrelationship. Circulation of the electro the central arms so that the ends of the cross lyte against the inner surface 'of the strip is arms and main member describe-an approximate prevented by contact with the rack surface and the deposit of metal on that area is accordingly ' - Mounted along the full length'of the top ofthe main frame member is‘a half round rod or bar ‘ l6 of brass, copper, or other conducting material. ‘ The rod 'is- secured with the ?at surface ‘of its semi-circular cross section in contact with the frame member and its diameter projecting sym 55. metrically beyond the two faces of the member. r“. . for receiving the strip material. of the main member are relatively shorter than oval. so lectively provide a continuous, smooth surface prevented. Plating current is introduced to the strip through contact with the half round rod, which is connected to‘ the bus bar through the support ing arms. Introduction of current to the uni formly spaced intervals of' the strip in contact 2 2,129,868 with the rod facilitates the electrodeposition of a uniform coating on the strip surface. In the plating operation, vertically arranged anodes (not shown) are positioned on opposite described herein can be made to accommodate sides of the, rack and the metal strip on the various requirements, and it is to be understood rack serves as a cathode. In general,.a series of that the invention is limited only by the scope alternate anodes and cathodes are employed with anodes at each end of the series. of the appended claims. What is claimed is: 1. A plating rack for metal strip, comprising a frame of non-conducting material, an elongated member made of conducting material mounted ' The dimensions of the rack details are deter 10 mined largely by the composition and size of the material to be coated. Compact and easily han dled racks are employed for‘ brass strip .003" thick which conforms readily to the surface con‘ tour of the rack. In constructing the rack, 15 careful consideration is directed to the frame. members which are preferably constructed to form the strip supporting surface into an ap proximately oval section so that all portions of the strip will be in close contact with the convex 20 surface of the rack. For relatively thick mate rial it may be necessary to form the rack more nearly cylindrical in shape to insure continuous contact between the strip and rack? surface. However, a rack having an elongated axis is preferred because this construction presents the strip more uniformly to the plating anode which assists in control of coating thickness and also permits a greater number of racks to be placed in a tank’of given length. 30 or varnish spraying, in cases where it is desirable to restrict the coating to one side of the strip. Other modi?cations of the speci?c structure > The surface of the rack can be made of’ hard rubber or phenol ?bre and in some cases may be faced with soft rubber, depending on the size and composition of the strip material. For plating thin brass strip, hard rubber approximately i‘s" 35 thickv was usei satisfactorily and the thin strip was retained in sufficiently close contact with the rack surface without difficulty. For thicker strip or material which does not distort easily a soft rubber facing into which the material can 40 be imbedded may be required. Durable, non-con ducting materials are employed for the frame, strip supporting sheet and clamps to prevent the deposit of metal on the rack members and to reduce maintenance and repair costs. A rack of this “general description is also suit 45 able for supporting strip material during coating processes other than electroplating, such as paint on the frame, a sheet of insulating material mounted on the frame with its ends abutting against the conducting member for receiving the metal strip, a clamp mounted on the frame for se 15 curing one end of the strip, a second clamp on the frame for engaging the other end of the strip and holding the strip in close contact with the insulating sheet and the conducting member, and means for conducting plating current to the con ducting member. 20 - 2. A plating rack for metal strip, comprising a frame of non-conducting material having a main vertical member and a plurality of cross mem bers extending therefrom, a bar of conducting 25 material secured to the top of the vertical mem ber, a continuous sheet of insulating material secured to the end of the frame cross members with its ends abutting the conducting bar, and an arm ‘of conducting material extending from the‘ 130 bar for conducting plating current thereto. 3. A rack for plating metal strip, comprising a frame having a central member and a plurality of cross arms projecting therefrom, a bar of con ducting materlal having a semi-circular cross section secured to the top of the central frame member with portions ofthe bar diameter ex as tending beyond both faces of the frame member, a continuous sheet of insulating material secured to the ends of the frame cross arms with its _ ends abutting the projecting portions of the con-' ductor bar for supporting the strip, a formed arm , secured to the bar for conducting plating current thereto, and a plurality of clamps for securing the strip tov the supporting surface of the rack. ALBERT PEARSON.