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air passing through the hollow stem 4 into the tire. When the stem is relieved from the load pressure it, the stem, and the piston 13 are moved outward by the spring 15, such movement of the piston drawing a free charge of air into the cylinder through the valve controlled inlet 16. When the stem 4 is again moved by the load pressure the op- eration is repeated. thereby automatically 10 charging the tire and keeping the same in- flated. By making the tubes 8 of sufficient length and by proper adjustment thereof in the manner stated movement of the stem 4 and piston 13 may be regulated. and as a 15 result the degree of inflation of the tire con- trolled. From the foregoing description, taken in connection with the accompanying drawing the advantages of the construction and of 20 the method of operation. will be readily ap.. parent to those skilled in the art to which the invention appertains, and while I have described the principle of operation .of the invention, together with the device which
I now consider to be the best embodiment 2F thereof, I desire to have it understood that the device shown is merely ilustrative, and that such changes may be made when desired as are within, the scope of the invention as claimed."-s0 Having thus described the invention, what is claimed as new. is.:- In means for automatically inflating pneu matic tires, the same comprising a cylinder, a spring actuated piston arranged to operate a within the cylinder and a hollow stem con- nected with such piston and extending into the tire to be inflated, said cylinder and stem having valve controlled openings, and nip- ples or short tubes threaded into an end of . the cylinder and adapted to engage the pis- ton to limit the movement thereof. In testimony whereof I affix my signa- ture in presence of two witnesses. JOSl FERNANDEZ. Witnesses: ISAAC GARZA, ALBERTO SADA.