US112792A - Improvement in balancing vertical-reciprocating masses - Google Patents

Description

that@ m tutti dtffit,

WILLIAM F. DURFEE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO HIM- SELF AND JACKSON & WILEY, OF DETROIT, MICHIGAN,

Letters Patent No. 112,792, dated una 21, 1871.

' The Schedule referred to in these Letters Patent nd making part of the same.

To all whom fit ma/y concern:

Be it known that I, WILLIAM F.' DURFEE, of Bridgeport, in the county of 'Fairfield and State of Connecticut, have invented a new and useful Improvement in System of Balancing Vertical-reciprocating Masses; and I do hereby declare that the following is a'full, clear, and exact description thereof, whichv will enable others skilled in the art to make and use the same, reference being had to the accompanying dre-wing forming part of this specification.

The drawing represents a vertical centralf'section of a vertical steam-engine, showing my improvement ap plied.

My inventionrelates to and consists in a new way of balancing the pistons of vertical steam-engines,- pump-rodsin' mines, the top roll 0f rolling-mills, the saws of saw-mills, and other vertically-reciprocating masses. Y l

The principle of my invention consists in balancing the weight of a vertically-movable mass of matter by a piston connected therewith, and receiving a continu ous supply of steam at boiler-pressure upon its-lower side, the said steam raising the movable weight on the upward stroke, and offering an equal amount of e resistance thereto on the downward stroke.

l will now describe a vertically-working piston, as illustrative of and fully exemplitying my new idea or plan.'

G in the drawing represents' the main cylinder of an upright steam-engine:

P, the piston; and

R, the piston-rod.

R is the upper-part of the piston-rod, having the same cross-sectional area as the part Rv;

P', au auxiliary piston;

C', the chamber, in which the latter travels; and

T, a pipe, connecting with the steam-boiler.

B is a stufiing-box, between the two piston-cylinders C G, to prevent steam from passing from one to the other along the piston-rod.v

The mode of operation is as follows:

The cylinder C (through the pipe T) receives steam at boiler-pressure, which acts upon the under surface of the piston P. This under surface is so proportioned in its area that the forceof steam is exactly (or enough so for all practical' purposes) equal to `the weight of the reciprocating mass; thus, on the upward stroke it entirely lifts this mass, and on the downward stroke altagonizes it, offering'a resistance equal to the gravity thereof'. In this manner the weight of all the moving parts is completely neutralized, while on the down stroke the steam is also returned, without waste, to the boiler.`

Having thus described all that isnecessary to a full understanding of my invention,

What I esteem to be new, and desire to secure by Letters Patent, is-

A piston, P', and cylinder C, combined, as described,

with a pipe, T, receiving steam at boiler-pressure, for the purpose of neutralizing vertically-movable masses of mattei', as described.

Witnesses.: WILLIAM F. DUEFEE.

M. DIAMOND, R. P. CHAPMAN.

Images