. Railway master mechanic [microform] . ut which has been lim-ited mostly by the frailness or the slenderness of the work. Single Speed Pulley Gear Driven Lathe THE new L8-in. single-speed pulley, gear-driven lathe, shownherewith, is built by the \\ hitcomb-Blaisdell Machine ToolCompany, Worcester, Mass. The new form of clutchused in making the speed changes is the principal feature of thedesign and this construction involves a principle upon which abasic patent lias been received. The geared headstock is shown in Figs. 1, 2 and 3. Referringto Fig. 3, power is received at driving pulley A, whi
. Railway master mechanic [microform] . ut which has been lim-ited mostly by the frailness or the slenderness of the work. Single Speed Pulley Gear Driven Lathe THE new L8-in. single-speed pulley, gear-driven lathe, shownherewith, is built by the \\ hitcomb-Blaisdell Machine ToolCompany, Worcester, Mass. The new form of clutchused in making the speed changes is the principal feature of thedesign and this construction involves a principle upon which abasic patent lias been received. The geared headstock is shown in Figs. 1, 2 and 3. Referringto Fig. 3, power is received at driving pulley A, which is keyedto shaft B. The shaft B revolves in fixed bearings in thehead-stock and carries pinions G G and G keyed to it, and haspinion teeth cut on it at G. These four pinions mesh with cor-responding gears Dh D?, D*. Dt, which normally revolve looselyon friction shaft E. Either one of clutch bodies Fi, F2 and F«.and gear H, may. however, be engaged with the correspondinggear D , etc., by means of clutches G, etc., whose construction. Fig. 1—Single-Speed Pulley, Gear Driven Lathe. February. 1909 RAILWAY MASTER MECHANIC 53 is described later. Four rates of speed may be given to shaft Ewhen pulley A is running at constant speed. Shaft E carries gear H keyed to it, and has pinion teeth cutin it at /. H and / mesh with gears K and L; K is keyed toclutch member M. L and M may be connected by clutches N,and Nx respectively, with clutch bodies Ox and 02, which arekeyed to the spindle P. The four speeds, which may be givenshaft E are thus doubled, giving eight speeds for the spindle. The construction of clutches G and N is seen in the detailedviews at the right of Fig. 3. This form of clutch is a positivefriction clutch, its engagement taking a measurable amount oftime and allowing some slipping of the engagement surfaces,which obviates the severe shock met with at high speeds inpositive clutches. On the other hand, the uncertain drivingpower and excessive slippage met with in fric
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
