GB179971A - Improvements in foot operated tyre inflators or the like - Google Patents

Abstract

179,971. Turner, W. Dec. 11, 1920. Oscillating-cylinder pumps. - A tyre or like inflating compound pump of the kind comprising two concentric cylinders wherein compression is effected simultaneously during the downstrokes of the pistons is adapted to be operated by foot in the manner applied previously to single acting pumps. In another form, the cylinders are arranged side by side. As shown the pump comprises cylinders h, j, Fig. 2, the outer cylinder being pivoted to the base and the inner formed with a piston 12 and reciprocated in the cylinder by means of a foot-pedal 24 mounted upon levers 21 pivoted to the base, the levers also being pivoted to a rod 19 connected to the inner cylinder. During the downward movement of the levers, air is drawn into the outer cylinder, the air previously contained therein being forced past the valve 37 formed in the piston 12 into the suction space of the inner cylinder and the air on the compression side of the piston 38 discharged through the valve 33, conduit 28, and outlet 3 to the tyre valve. The upward or return movement of the levers is effected by springs 25, secured at their ends to the base. Fig. 1 shows the cylinders mounted side by side and pivoted upon a base, the cylinders communicating with one another through a conduit 6 having a non- return valve 5. The pistons are connected to a bridge piece 17 carrying a bearing 18 for the rod 19 which is pivotally connected to the footlevers 21.