Patent GB-190916590-A (GB)
Title: Improvements in and in the Manufacture of Bottom Brackets of Cycle Frames.
IPC: B62K19/34
Filed: 1909-07-16
Granted: 1910-04-21
Abstract: 16,590. Pugh, Ltd., C. H., and Bull, G. F. July 16. Pipes.-Crank-axle brackets for cycles, of the kind made from sheet-metal blanks, have the cotter-pin sockets or lugs wholly or partly formed upon or attached to one side of a ring, which is adapted to be fitted and secured within the open end of the bracket shell. As shown in Fig. 2, a ring b with a socket a integral therewith is welded within the open end of the bracket c with a part a extending through a gap in the edge of the bracket and engaging between a pair of horizontal ears c<1>. A gap b<1> allows engagement of the cotter with the usual bearing-cup which is screwed into the ring. The socket and ring may be formed integrally by piercing two holes in a blank, raising the metal around the holes, clipping off superfluous metal to leave rings or sleeves b and a connecting-piece a, Fig. 16, and then folding the part a around a mandrel so that the rings come together edge to edge to be welded or otherwise united. In another arrangement whereby two fittings are made from a single blank, a piece of the shape shown in Fig. 16, but with the part a about twice as long and with the sleeves b the full depth of the ring, is divided across its middle so that the end of each half is of dove-tail shape. The sockets are then formed by rolling over each part a to engage the dovetail end with a correspondingly-shaped recess in the upper edge of its ring. In a further modification, a ring having at one side a pair of lugs, one extending inwards and the other outwards, is operated upon to convert it from its flat form into a ring set on edge ; the lugs, which then extend vertically from the top and bottom edges, are then bent over outwards and their meeting edges welded or otherwise united to form the socket; or the flat ring may be provided with a single longer extension upon one edge only, and in this case the extension is rolled over to form the whole of the socket. The ring and socket may, however, be formed separately. Thus the ring may be fashioned from a blank or strip and be provided at one side in its top and bottom edges with shallow gaps or recesses into which the edges of a blank folded into U-form are secured. Or the ring may be open at the socket side and be turned out into horizontallyprojecting ears between which the socket part formed by bending a blank is inserted and secured; in this case, the bracket shell is gapped without being provided with ears. Or a blank a, Fig. 40, may be folded into box form and be secured to a plain split ring b, Fig. 39, by the engagement of lugs a<2> with openings b<4>, the parts being then welded or otherwise secured. The main tubular part of the socket may be formed integrally with the bracket shell by raising the side between two slits into a vertical sleeve, the ring being then provided with pierced ears which are arranged to extend through the slots to cover the ends of the socket. Or each end of the bracket shell may be formed with a pair of inwardly-extending slots between which is a tongne adapted to be bent or raised into a bridge-piece or sleeve; a ring with pierced ears is then inserted into the shell so that the ears pass through the slots and extend above and below the sleeve.