GB642602A - Improvements in method of repairing cracked or fractured metal walls - Google Patents

Abstract

642,602. Dowel pins. SCOTT. L. B. Aug. 5, 1947, No. 21241. Convention date, March 3,1939. [Class 89(ii)] [Also in Group XXII] To repair a body at points subjected to strain or to reinforce or prevent leakage from a cracked or fractured body, e.g., engine cylinder or manifold, the metal adjacent the crack, &c., is removed, recesses are formed in two opposite walls of the opening so formed, and pliable metal sealing means is pressed in to engage said recesses. A groove 11 may be cut in a casting 10 to overlie a crack a and holes 14 be drilled in the side walls of said groove. One of each pair of opposed holes may be threaded at 14<1> and bars 17 successively screwed in after pliable metal or other packing 16 has been inserted. Each bar of the first row is pressed to enter the unscrewed end and flatten it before further packing and another row of bars are introduced, This is repeated until the groove is filled as at Fig. 6. If desired the groove may be cut at right angles to the crack so that the repair will distribute the strain over a greater area of sound metal. Any number of bars may be used and the greater part of the groove may be filled with packing only as in Fig. 8. The side walls of the groove may be sloped. A strip 18, Fig. 16, with pairs of lugs 19 to enter the holes 14 may be arranged lengthwise of the crack in place of a row of bars 17. Fig. 13 shows a modified strip, the groove being cut to fit the lugs 20. Figs. 14, 15 show a form for surface application, the lugs 25 engaging corresponding recesses giving additional strength. When the weakened metal surrounding a crack is extensive, a long bar, Fig. 19, with 'pins at its ends to engage sound metal. may be used.