GB241603A - Improvements in, or relating to, foot-operated pumps for compressing air or other gases - Google Patents

Abstract

241,603. Routledge, W. June 20, 1924. Oscillating cylinder pumps; actuating pumps by foot power.-A foot pump in which the piston is operated by a lever and a crank swung from the same centre, a connecting rod not being used between the crank and piston, is provided with a spring for effecting the return stroke with means for releasing and resetting the spring, so that when not in use it is not subject to strain. The pump has an open-ended oscillating cylinder pivoted to a base at the point c and provided with an air outlet and non-return valve, d. A rod g threaded at both ends connects the piston e to a support f bearing on the cylinder, the distance of the support from the cylinder being adjustable by a nut h on the support. A portion i of the cylinder is cut away to allow access to the nut. The piston and support are pivotally connected by a double eye m to one arm of a crank lever; the other arm j<11> constitutes a pedal formed by elbowed side arms, which moves through equal angles above and below the pivot k. The return stroke is effected by a spiral spring n, one end of which is fixed to the lever while the other is attached to an arm r freely pivoted on the pivot k of the lever and having a catch or recess s at its free end, adapted to engage a catch t on a weighted crank lever v. When the pedal is raised to its highest point the catches engage, and the spring becomes virtually anchored to the frame; the spring is released by tilting the lever v. Alternatively, the lever v may be pivoted to the arm r and provided with a catch to engage the base. The release and setting of the springs may also be effected by catches made to engage by hand. The length of the cylinder and the position of the pedal lever are such that by removing the gudgeon pin from the double eye, the cylinder can be swung into upright position and the piston withdrawn. A handle may be attached to the treadle.