NEW PATENT SPRING

Evening Post, Volume CXIII, Issue 25, 30 January 1932, Page 10

NEW PATENT SPRING

A LUBRICATING^ 'GROOVE^

It has often been suggested that, I bj using spmig lca\es of special sec tion,- ehanneis-eould--be-formed- through i\hich giease could be distributed fiom a'central nipplo supplied at iftfervals' from a gun, but so i.ir this method,has raado but httlo practical progress. ~lt is, tlleiefoic, mteiesting to "notice 'tliat an j'jtnol> new spring of this kijid\fia« been bi ought otat by'a famous British, v firm ot spi^jig^ makers/ at piescnt, the idea^has'been applied only to certain 'commercial vehicles, there is fto reason why it should not, be adopted cais." f ~ \ / 1 Tho patented used for the plates l^aa'the a'dvantago of ,locking each plate to its neighbours m respect of latoial movoinent, although the nsunl endwise bliding'^can* take ,plaoe quite fieely. _ Tho^lates arc,^j(ereforej posi.tively "jSieVcntedJ frbm, kpraying. 'iTfie special feature' of the Selifio"nfis,'Ji6w'overj found in. tho longitudinal channel left betweei 'adjacent ■ ptates, through which grease can'travel from a centre bolt ot grooved design fitted' With a nipple for the application of tho usual gun. An incidental advantage of this patented section is that it-enables maximum working stresses, somewhat higher than those' normally .employed,, to be i used-with safety. """'ln 'other' words, springs built up of plates with -the seeI tion need not be so heavy as a normal spring of the samo length and taking tho same load Tho reasons underlying this piopeity relate to" the fact that, when the culvaturo of the plates is alteicd (by loading), ca.chj)late tends, also to cuive laterally, becoming slight ly con\e\ on tho compression side and concave on the tension side.