US500297A - Piston-packing - Google Patents

Description

(No Model.)

P. REILLY. PISTON PAGKING.

Patented June 27, 1893.

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PATRICK REILLY, OF NEVVBURG, NEV YORK.

PISTON-PACKING.

SPECIFICATION forming' pari'. of Letters Patent N0. 500,297, dated June 27, 1893.

Application filed March 16. 1893. Serial No. 466,254. (No model.)

To all whom it may concern.-

Beit known that I, PATRICK REILLY, a citizen of the United States, residing at Newburg, in the county of Orange and State of New York, have invented certain new and useful Improvements in Piston-Packing; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to an improved piston-packing for steam-engines, and has particular reference to an improvement in that general class known as metallic packing; and my object is to provide a packing which will not cut into the cylinder sides or wear away prematurely, and at the same time be as effective or more effective than any heretofore known.

To this end my invention consists of certain peculiarities of construction and combinations and arrangements of parts all of which will be now fully described and finally embodied in the claims.

Referring to the accompanying drawings, which illustrate asteam-en gi ne piston in which the essential elements of my invention are comprised: Figure I represents an end elevation thereof partly in section; Fig. 2 a side elevation partly in section; Fig. 3 a side elevation of the lower portion of the piston, the remaining part being broken away.

The reference letterAindicates the pistonrod and B the piston-body to which the piston is secured in any preferred manner. The piston is constructed in two sections B, B', the main portion B being formed substantially pan-shaped with the bossed opening h in which the piston-rod is secured as aforesaid, and the radial ribs or braces b. Fitting over the portion B of the piston is the second section B bolted in place by the bolts b3, and of such a shape as to leave a series of chambers C in the interior of the piston, the function of which will hereinafter appear.

When the two sections of the piston have been secured in place, a groove or depression D is formed. This depression D extends along the entire circumference of the piston and is formed by the flange D of the section B of the piston, and the outer rim of section B which is secured to the section B directly opposite the iange D and comprising the companion liange, thereby completing the groove, the outer edge D2 of the section B forming its bottom. In this groove the piston-packing is arranged. This comprises four metallic packing-rings E and F located in tiers of two each, one tier upon the other. The rings of the inner tier E are each divided by a square-cut at e, and held in engagement with the outer tier F by means of the elliptical-springs G, seated in transverse grooves or depressions g of the edge D2," and extending longitudinally with the piston-rod. The rings F are, as before stated, located upon the lower tier and have each of their contiguous ends f arranged diagonally to prevent cutting the cylinder sides, and are arranged at points opposite each other so as to prevent the steam which may pass one, from passing the other also and thus leading past the piston. By this construction it will be obvious the outer tier of rings will be pressed by the tier E strongly against the cylinders interior sides, and that such inner tier derives its outward tendency from the springs G, thus adjusting the packing to all inaccuracies if any should exist, of the cylinder and insuring its eective operation.

Formed in each of the tiers of rings E and F, and at the lower side of the piston, is an elongated opening H extending about onethird the distance of the pistons circumference and of such a size as to leave a portion of the rings on each side. In this opening the piston-shoe I is located. The shoe I consists of a brass segment of such dimensions that it will fit snugly within the opening H, but capable of independent movement therein. The purpose of this independent movement is to adj ust the shoe to compensate for wear, which adjustment is effected by the threaded bolts J extending through the part D2 of the section B, and revolubly secured in the shoe at j. The heads of these bolts each extend into one of the chambers C, whereat they are provided with the locking nuts K. When so ar- IOO ranged easy access may be had to the bolts J, the reception of which being the province of the chambers C.

From the above description it will be seen that the shoe I being on the lower side of the piston, supports its Weight, and being formed of soft metal will not cut into the cylinder side as would the rings F, but will gradually wear away. To compensate for this the adjusting bolts J are provided.

The shoe I is preferably formed from any integral ring of cast brass, or other soft metal, of a size equal to the diameter of the piston. It is then turned true, iinished and divided into three parts, thus forming three shoes. Vhile I regard this as the preferred method of producing the shoe, it will be obvious that maly other` modes probably as good, could be 11S@ Having thus described my'invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a piston the combination with a packing ring or rings, of a shoe or carrier extending through the saine and independently movable in relation thereto for supporting the weight of the piston, substantially as de scribed and set forth.

2. In a piston, the combination with two spring-pressed packing-rings each having an opening formed in their adjacent sides, a shoe or carrier fitting in the openings and provided with means by which it may be adjusted independently of the rings, substantially as described, and set forth.

3. In a piston, the combination with a groove or depression extending along its circumference, packing rings located therein, elliptical springs arranged in the groove and actuating the rings, said rings having an opening formed therein, a shoe or carrier located in the opening, andbolts for adjusting the shoe, substantially as described.

In testimony whereof I aitix my signature in presence of two witnesses.

PATRICK REILLY.

Witnesses:

THOMAS V. REILLY, FRANK I-I. CAssEDY.

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