USRE4678E - Improvement in pumps - Google Patents

Description

ROBERT M. LAFFERTY.

Pumps.

Reissued Dec. 19. 1871.

UNITED STATES PATENT OFFICE.

. ROBERT M. LAFFERIY, OF THREE HIVERS, MIOHIGA.N, ASSIGNOB IO HIMSELF AND EDWARD P. SMITH, OF SAME PLACE. y

IMPROVEMENT IN PUMPS.

Specification forming part of Letters Patent No. 104,604, dated J une 21, 1870 reissue No.4,678, dated December 19,

T0 whom it may concem:

Be it known that I, ROBERT M. LAFERTY, of Three Rivers, in the county of St. Joseph and State of Michigan, have invented a new and useful Impro vement in Pumps; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon and being a part of this specification, in whioh Figure 1 is an elevation, partially in section, of my improved pump. Fig. 2 is a plan, partially in section, of the pump-piston. Fig. 3 is a horizontal section of the lining of the barre], taken on the line 00 90 in Fig. 1; and Fig. 4 is a plan of the foot-valve, also partially in section.

Like letters refer to like parts in each figure.

The nature of this invention relates to an improved construction of wooden pumps; and consists in the arrangement, within the pump-barrel, of a sheet-metal lining or bushing and the peculiar'method of securing the same in place'; also, in the novel construction of the piston and valves; and in the ingenious arrangement of the various parts, as more fully hereinaiter described.

In the accompanying drawing, A represents a wooden pumphead or stock, which is attached to a pipe or tube terminating in the water, and in which the workin g parts are arranged as shown in Fig. 1. B is a sheetmetal lining, which may be a cylinder, to fit the bore of the stock; or the lining may be made oylindrical in form and so that the ends of the sheet of which it is made will lap by each other, as shown in Fig. 1;' and it has a flange, a, turned outward on its upper and lower edges and extendiug nearly or quite around it. 0 is a lip formed at the.commencement of each flange, said lips pointing toward each other. lhe sheet of metal s0 arranged is formed into a cylinder by inserting the side Where the flange is out ofl' into the lips I). The lining is then inserted in the barrel, where it is held in place by the flanges entering the walls of the barre], either by expanding the lining and forcing them into the walls or by crozing therein a pair of grooves for their reception, the outward spring of the" metal tending to kcep it in contact With the barrel, following it when it expands and giving way to it in its contraction,the lips being employed simply to hold the laps together. 0 is a piston attached to the reciprocating piston-rod O, operated in the usual manner. 0 is a cupleather or packing, secured around the top of the wooden piston, which is chamfered at its edge to form an annular water-chamber between it and the cup-leather, reacl1ing nearly down to the base of the latter, wedging the leather outward in the upward stroke of the piston. 'lhe lower half of the valve is diminished in diameter, as shown, and, from this part, a rovv of openings, d, enter the piston and are carried up through its top, as shown in Fig. 1. In the ordinary mode of constructing suoh pistons the openings for the passage of the water are bored directly through .them, weakening them to suoh au extent that they readily split off. In the present form the liability to split is avoided by oarrying the lower solid part of the piston well below the entranoe of the openings, thus insuring great strength therein. D is a disk, of stifl' leather, forming a valve or series of valves, secured by a shoulder in the rod to the center of the piston. It is radially and concentrically grooved, as shown at 6, Fig. 2, the parts between the grooves forming valves, Which, in the downWard stroke, arc enabled to rise, by reason of the flexibility of the grooved parts of the disk. E is a plug, perforated with suitable openingsf for the admission of water. D is a disk forming the foot-valve, eonstructed as above described, and centrally secured to the plug by the eye-bolt 9, by ineans of which the plug may be withdrawn from the pump-barrel, if desired. The plug E ditrers in construction from those in ordinary use in this, that its top is concaved or cup-shaped to about the shape that the valves would, from use, as-

sume, so that, where there is not the weight of a high column of water imposed on the valve, it .Will readily close down on the upper surface of the plug. VVl1en a pump-barrel and tube are of the same diameter throughout the lining ma be carried down to the bottom of the barrcl and held inplace by the upper end of the tube expanding it outward against the walls of the barrel.

'What I claim as my invention, and desire to secure by Let ters Patent, is-

1. The sheet-metal lining B secnred in the intcrior of the wooden stock A by turning or fianging the ends of the tube forming the lining into grooves out in the stock, substantially as set forth. 2. The piston o provided with the curved openings d and With the cup-leather c and valve D,

When each of said parts is constructed as debarre] A, lining B, piston G, plug E, and Valve scribed, and arranged to operate, as and for the D D, when each part is constructed, arranged,

purposes set forth. and operatin g, substanfially as described, and for 3. In combnacon with the parts named in the the purposes set forth. preceding paragraph, the plug E woh concave ROBERT M. LAFFERTY. npper face, openings f,gand cupleather D, al1

constrncted and arranged to 'operate, as and for Witnesses: the purposes set forth. H: F. EBERTS,

4. The c0mbination and arrangement of the M. STEWART. (118)

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