US1089114A - Metallic rod-packing. - Google Patents

Description

O. R. CRUMP & L. J. DAVIS.

METALLIC ROD PACKING.

APPLICATION IILED JUNE 14, 1913.

1 ,089, 1 1 4;, Patented M21113, 1914.

TIN @TATES PATENT CHARLES RAY ORUMP AND LUTHER J. DAVIS, OF CHICAGO JUNCTION, (EH10.

METALLIC ROD-PACKINGn Specification of Letters Patent.

Patented llliar. 3, iltlitct.

To all whom it may concern Be it known that we, CHARLES RAY CnUMr and lnrrnnn J. Davis, citizens or the United States, residing at Chicago Junction, in the county of Huron and State of Ohio, have invented certain new and useful lmprovements in liietallic Rod-Packing, of which the following is a specification.

This invention relates to sectional, wear compensating metallic packing for piston rods and has for it objects to provide a packing composed of two sectional rings arranged side by side on a piston rod with the joints of the sections so arranged as to prevent all torwa rd passage of steam, either between the rings and rod or between the var ous parts of the rings or between the l11C1- vidual rings.

A further object is to provide means to insure a perfectly tight fit at all points, so that the wear on one ring of the packing might be more than on another and still both rings would remain equally t1ght; likewise, it the wear on one section or segment i more than on another or either or both rings, so that the ring so aiiectcd will still be perfectly tight at all points. This unequal wear of parts is often caused by some flaw or defective material.

Still another object is to provide means for increasing the influence of the spring by cam action, thus facilitating the contracting wear compensating action of the packing.

A further and secondary object is to provide aflexible metallic packing which will permit the piston rod to be raised or lowered or otherwise moved to center the same without in any manner impairing the elliciency of the packing or requiring its reassembling and adjustment on the rod, all of which obects, among others, are accomplished by the construction, combination and arrangement of parts hereinafter more particularly described and claimed and illustrated in the accompanying drawings forming part of this application and in which:

Figure 1 represents aside elevation of a packing embodying our invention, the same being applied to av hollow piston rod of an air compressor; Fig. 2, a top plan view of the same in position in a gland (Z in the packing casing D, another gland (Z being shown for the reception of another packing, if desired. 3, a cross-section on line 3-3 of Fig. 1; 4;, a cross-section on line 4 l; of Fig. 1; and Fig. 5, an enlarged detail view showing the cam action oi the periphoral segments 3 of the inner ring or the packing on the inner segments l thereof.

it would be well to note that the number of these two ring packings to be used is to be determined largely by the uses to which the apparatus is to be put. Also the kind of metal employed should be varied to meet the needs of the particular case, for the temperature on the steam end of the piston rod would vary greatly from that of the compressor end in an air compressor.

Referring now in detail to the drawings, A indicates the piston rod, B the outer ring, C the inner ring, of the packing and D the packing casing having packing receiving glands (Z. The outer ring 13 is composed of three smooth faced segments 1 arranged a slight distance apart and equidistant around the rod. These segments 1 are held in their relative positions and forced inward to compensate for wear by the circular coil spring 2, which lies in a groove in their outer edges. The inner ring C consists of a peripheral set of three segments 3 and an inner set of three segments el, arranged break-joint fashion. The inner set of segments 4 is arranged concentrically on the rod and each segment is located equidistant therearound and opposite the openings in the ring B and is provided on its outerside with a pin 5 which projects between the two adjacent segments 1, thus holding the rings B and G in proper position with relation to each other. The outer set of segments 3 of ring C is arranged around the inner set of segments 4 in break-joint fashion with relation thereto and each segment 3 is provided on its inner face with a spacing pin 6, which projects inwardly into the space between the two adjacent inner segments 4:, thus keeping the inner and outer sets of segments of ring C in proper relation with regard to each other. also, the inner faces of segments 3 are ground on a curve eccentric to the rod, so that these segments 8 will engage the segments t on their tip ends only, thus exerting a cam or lever action on the segments 4; and forcing them down on said piston rod with absolute perfection of fit. This one point engagement forces the segments 4 inwardly and together to coin pensate for wear and it also greatly facilitates such movement as is obvious, greatly decreasing all friction. A circular coil spring 7 lying in a groove in the outer edges of the segments 3 holds all the segments 0 and at of ring (J in place and acts to force segments 3 inward, with the above described result. It is to be noted that each ring of the packing has its own independent spring.

In practice all faces of the segments should be machined to insure a perfectly tight fit. The end pressure on the outer ring B forces it tightly against ring C, thus preventing all leakage of the steam or air, or other fluid, between the rings, and the cam action of segments 3 on segments t forces the latter tightly against the rod, preventing all leakage of steam or air, or other fluid, between the segments at and the rod, thus the packing is absolutely tight.

Having thus described our invention, what we claim as new and desire to secure by Letters Patentis:

l. In a metallic rod packing, an outer sectional ring and means for holding the sections in position, in combination with an inner ring composed of a peripheral set of segments and an inner set of segments, the inner set having their inner faces ground concentrically to the rod and the outer set having their inner faces ground eccentrically to the rod, thus touching the inner segments only on their tip ends, and a spring passing around the outer segments, the outer ring of the packing being presented toward the pressure end of the rod.

2. In a metallic rod packing, an outer sectional ring and means for holding the sections in position, in combination with an inner ring composed of a peripheral set of segments and an inner set of segments, the inner set having their inner faces ground concentrically to the rod and the outer set having their inner faces ground eccentrically to the rod, thus touching the inner segments only on their tip ends, spacing pins secured in said segments to hold them in proper relation to each other and the two rings in proper relation to each other, and a spring passing around the outer segments, the outer ring being presented toward the pressure end of the rod.

3. In a metallic rod packing, an outer ring composed of segments and a spring passing around their outer edges, in combination with an inner ring composed of a peripheral set of segments and an inner set or" segments, the inner set having their inner faces ground concentrically to the rod and the peripheral set having their inner faces ground eccentrically to the rod, thus touching the inner segments only on their tip ends, and a spring passing around the outer se ments, the outer ring being presented toward the pressure end of the rod.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

CHARLES RAY CRUMP. LUTHER J. DAVIS.

Vitnesses:

C. E. FETZER, HARVEY A. FETZER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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