US81451A - Improvement in pump-pistons - Google Patents

Description

TO ALLv WHOM IT MAY CONCERN:.

JOHN WOOD, OF i FRANKLINfPENNSYLVANIA,

Letters Patent No. 81,451, dated )ingaat 25, 1868 turner/Burnt IN rUMr-PIsToNs.

@tige ttml'e aferra in in tigen rttets atnxt 'mit mating artt nf tige same.

Bo it known that I, JOHN WOODof Franklin, in the county of IVenango, and State of Pennsylvania, have invented a new and improved Pump-Piston; and I do hereby declare that the following' is a full, clear, and

exact description thereof, which `will enable others skilled in the art to make and use thc-same, reference being had to the accompanyingdrawings, 'forming part of this specification.

This invention relates to a new and improved method of constructing pump-pistons or valve-boxes, whereby the sa'meare selfexpanding,a.nd are thus'rendered incredurable. It consists of a valve-seat and ball or globevalve, secured to the`piston by a scrcwthread,`the upper part of the piston boing provided with an expanding y packing, which, when the piston is raised, is pressedout against the pump-cylinder, so that it fits perfectly tight within the sonic.

VThe drawing represents a central vertical section of my piston and valve, the red lmes'showing the pumpbarrel or cylinder'. i A

A is the upper section of the pistou; B is the `middle section of the piston C is the lower section oi' the same `a are projections or fingers in the section A, by means of which the packing P is kept in position.

a are pegs, by .means of whichthe packing P is secured to the piston. b is the valve; e' are ribs in the section B, lby means of which the valve b is guided in such a way as to allow the passage of liquids when the piston is moving down.

P is the packing;l d are screw-threads, by means of which the piston'is attached to the pistorrrod.

The piston or valve-box is constructed in the sections A B C, which said sections are secured together by screw-threads, the object of which is that thereby the piston may be easily taken apart when the valve V or the packing P is fouled or in want of repair.

The upper section A is a hollow cylinder, having on its under side a screw-thread, by means oi' which it is fastened to the section C. Said section'A has on`its upper side a stirrup, F, in the ordinary form, terminating l in a scrcwethread, d, byy means of which it is attached to the piston-rod. l

Upon the upper side of said section are projections or fingers a, either attached to the same or being a part thereof,which, with the stirrup F, serve to prevent the packing P from being pressed inward or away from the pump-cylinderby the force of the liquid above the packing, and to keep said packing in position.

To said upper section A of the piston is secured, by the pegs a', a, h-ollow cylindrical packing of leather o1' othcr suitable material, extending above said section A, in the-shape of a cup, and kept in position, as above described, by the fingers a and the stirrupF, so then when the piston is iilled with any liquid, said packing P is expanded outwards against the pump-barrel or cylindemiitting the same tightly, so that no fluid can escape by said packingwhcn said piston is raised.

Said section B is also a hollow cylinder, secured, as above described, to the sections A and C, by screwthreads, as shown in th'c drawings. 4

To th'e inside of saidfsection B, arc either attached or made part of the samethc ribs o, serving as a guide for the ball-valve o in its upward and downward motion, and allowing a space around the ball-valve u, through which the liquid can pass when thcpiston is moving down.

The section O is also a hollow cylinder, scoured to the section B by a scrcv."tli1'cad, as shown in the drawing,-having on its under side a'stirrup, G, terminating in a screw-thread, c'-, by means of which it is attached' to a guide or rod.

' Upon the upper edge oi' said section C is the valve-scat, in which the valve b rests.

The opei'atiou is such that thc pressure of thc water or other liquid, inside of the packing P, always keeps the saine perfectly tight.

Whenconstructed as above described, it constitutes a reliable and durable pump-piston, for the raising of water or other liquids, and which may be easily taken apart for purposes of cleaning or repair. I claim aswncu', and desire to'sccurc by Letters Patent-'- Thel movable sections A B C, the packing P, the ball-valve V, and ribs e, arranged as herein described, for tbc purpose specified.

y i JOHN 'WOOD Witnesses:

A Pannen, A. P. WmTAunI'.

Images