US75714A - Jerome wheelock - Google Patents

Description

@with tetra datent ifftrr VLetters Patent 1Y0. 75,714, dfitecl M'mct V17, 1868.

IMPROVEMNT IN -PIS'IOIISl iilge .dgehitle referat tu in tigcetctters etent :mt nuttig aan ,titte 5min,

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TO` ALL WHOM'IT MAY CONGERN:

Be it known that I, IEROAIIE WHEELOCK, of lh'orcester, in the county of Worcester, and Commonwealth of Massachusetts, have invented n ew and useful Improvements in Steam-Piston Packing; and I do hereby declare that the followingris a full, clear, and exact description thereof, which will enable others skilled inthe art to make and use the saine, reference being had to the accompanying drawings, which make apart of this speciiication, in which- Figure 1 represents a perspective view of the ring.

Figure 2 is a sectional elevation of the same.

Figure 3 is a cross-section. l

Figure el is au elevation of my lexpansive packing-ring.

lhis invention relates to certain improvements in that class of pistons in which sectional or other expansive packing-rings are used in combination with a grooved or other-shaped ring placed between the pistonhead and the follower. A I i The invention consists in providing a wedge-shaped opening in the grooved or other-shaped ring, into which opening is fitted a corresponding-shaped piece, sa'id piece being held firmly in place by suitable fastenings, to he hereinafter more fully explained. v

A represents a ring, which may he applied to the ordinary piston. Its width should be made such as will allow of its being lirmly confined by the follower, and oi such a diameter as will allow it to fit loosely in the bore of the engine-cylinder. This ring slprovided with one or more annular grooves on the periphery, into which are fitted suitable' expansive packing-rings, which operate in u. manner to prevent the escape of steam before having done its work. In order to be able to apply this ring to pistons now in use in upright engines, whore the piston-rod is connected at the top, I cut a wedge-shaped lopening through the side of the ring', into which the piece B is nicely fitted, and held in place by the strap C, through which the screws or bolts 0l e pass,

and are screwed into the nutsfg. These nuts are iitted into dove-tailed cavities on either side of the opening in the ring, thc shape and position of which are best seen in iig. 3. 'lhe piece B should be ground to it steamtight, and in order to draw it snugly into place, the distance between the holes in the strap C, through which the screws pass, should be madeoi' such proportion as will allow of about one-sixteenth 'of an inch draught" sideways on the screws, when, byslippiiig the piece B back and catching the screws inthe nuts, and then by forcing the strap into place, the whole is conncd in a secure manner. I i

. Should it be necessary to enlarge the diameter of the ring, it may be done by putting lslips ofiron between the ring and the wcdgc-pieoe, when, by filing oli` the end of the nuts equal to the thickness of the "slips, the screws may be put in as before. In reducing the diameter, the slips may he applied in front of the nuts, and the wedge-piece reduced, `which will allow the ring to contract.

I have shown the screws/cle as being screwed into the nuts fg, but holes may be tapped into the ring A on each side of wedgeshaped cavity, into which the screws may be screwed, when, by making holes in strap C elongated, and putting pieces of iron on either side ofscrews in said holes, the same results may he obtained without changing the nature of my invention( i It is important that the wedgeepiece should be held rigidly in place, and should correspond in width with the other portions of the ring. Irthercfore recommend that it be fitted into place before the ring is turned, when the whole may be nished in one i'cperation. There are many engines new in use, especially those of large diameter of cylinder, which are worn much larger in that part over which the pistou moves, and it being important that my ring should nearly iill in the largest place or wearing part of the cylinder, the ring may be turned to the largest diameter; and in order to get it in the cylinder with the expansive packing in the grooves, the wedge-piece may be reinoved,which will allow the ring to contract, and after it has passed the smaller part or counter-bore, said piece may be put in place again and fastened as before. l l

I have represented my ring with two annular grooves on the periphery. Into each of these grooves is loosely fitted a packing-ring, which is expanded to {it the cylinder steam-tight atA each alternate stroke of the engine, by the action of the steam.l

H represents an expansive packing-ring made in one piece, with a joint so arranged as to allowthe ring to expand perfectly free, and yet work steam-tight. It may be made of cast iron, brass, or other metal; and in order that it may be kept out against the inner surface of the cylinder when not using steam, I make cavities or pockets, z, in the inside of the ring, into which may be placed steel springs, said cavities being made of' sulicient depth to admit of an elliptic-shaped spring, thereby insuring great elasticity and ease of action.- This ring is especially adapted to cylinders of a large diameter, and being very light and pliable, is easily adjusted to the inner surface of the cylinder, by the action of the steam, which is admitted behind it over' the outer flange of the grooves, the said anges being turnedvsmaller than the cylinder, to allow steam to press' against a portion of the expansive rings, therebyr keeping them pressed against the inner surface of the grooves', and admitting steam down between the rings and anges, thus keeping them pressed out against the cylinder. The arrangements of the joints are best seen in iig. 3. I have essayed various ways of making such a ring, but the' following I have adopted las the best known to me: f

I cast or make'the tongue lapped on the opposite side of the ring, and separate from it by a core, and when the tongue and its seat are properly milled out and-fitted, it may be sprung over the top andinto place, and clamped by means of the cavities in the inside, and turned to the proper size. A ring constructed in this way can be made at the least possible expense, and. when used in cylinders of a'large diameter, is very successful in its operation.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The ring lA, when the same is provided with a wedge-shaped cavity, and corresponding piece fitted into the same, in combination with the strap C and screws de, substantially as shown and described.

' JEROME WHEELOCK.

Witnesses:

Cms. WILBE, G. H. Sonrnwrcn.

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