Device for Replacing Valve Seats
A patent, under the serial number 657,626 has been filed at the Patent Office, Washington, D. C., for a device for refacing valve seats of power pumps and like machines and designed to be introduced into the chamber containing the valves and applied to the valve seats therein, avoiding their removal for refacing. The drawings, herewith, are: Figure 1. A longitudinal section of Figure 2 and Figure 2 a horizontal section of Figure 1. The specifications state that as one of the special objects of the invention is to provide a device which may be inserted through the hand holes in the casing of a pump chamber and used to reface the valve seats without removing them, the operative parts are enclosed in a casing which may be varied according to the arrangement of the gearing employed or the design of the pumps with which it is to be used. Extending through the casing is a vertical spindle constituting a main or power shaft, carrying a worm and having sockets at its ends for receiving the head of a flexible shaft. There also extends through the casing a vertical cylindrical chamber or bore containing a spindle head, the center of which is bored to admit the spindle around which the head is adapted to revolve within its chamber. The inventor’s claims are in part as follows: In a tool for dressing or refacing valve seats and which is adapted to be placed over a post or stem secured centrally to the valve seat, the combination with a cutter head carrying a cutting point, of means for rotating the head about its own axis and means for simultaneously revolving the head around the axis of the said post or stem; the combination with a rotary cutter head having a cutting point and mounted eccentrically to the said post or stem, of a power shaft, and gearing for imparting revolutionary movement to the cutter head about its own axis and revolutionary movement of the head about the axis of said post or stem. The fitting over said stem, a pressure foot for supporting the refacing device upon the valve seat, a spring intermediate to the presser foot and said device, and means adapted to adjust the device toward the valve seat against the pressure of said spring and to retract the same therefrom.