US793623A - Metallic packing. - Google Patents

Description

No. 793,623. v PATENTED JUNE 27, 1906.

p c. E. BOWEN.

METALLIC PACKING.

APPLICATION FILED NOV. 8, 1904.

UNTT no STATES Patented June 27, 1905.

PATENT FFICE.

MASSACHUSETTS, ASSIGNOR OF MALDEN, MASSACHUSETTS.

METALLIC PACKING.

SPECIFICATION forming part of Letters Patent No. 793,623, dated June 27, 1905.

Application filed November 8, 1904. Serial No. 231,913.

To It whom, "1116 may concern.-

Be it known that LCHARLES E. Bownrna citizen of the United States, and a resident of Dorchester,county of Sufl'olk,Massachusetts, have invented certain new and useful Improvements in Metallic Packings, of which the following is a specification.

This invention relates to metallic packings, and is intended to provide a packing of this class which shall be simple in construction. highly efficient in service, and capable of perfectly meeting the conditions of wear on the rod to which it may be applied.

In the accompanying drawings I have illustrated the preferred form of constructing my improved packing.

Figure 1 is a central transverse section taken through the casing or gland surrounding the rod and showing the arrangement of my packing in position for service. Fig. 2 is an end view of the packing, the rod being shown in section and the casing being removed. Fig. 3 is a detail view showing the cooperating parts of the packing separated and opposed to each other.

Referring now to the drawings, a designates the casing, gland, or packing-box, through which the piston-rod a passes out of the cylinder. The casing is formed with a main cylindrical chamber a having a rearwardlyextending cylindrical recess c which is of smaller diameter than the main chamber of the casing. Into this recess (1/ is disposed the annular flange 7) of a follower-ring 71, so as to lie between the piston-rod a and the peripheral wall of the extension chamber or recess o The adjacent part of the casing may be bored longitudinally to form recesses a to re- ,ceive springs a which press against the rear face of the follower in order to normally press it tightly against the packing-rings. The objcct of this arrangement is to so construct and arrange the follower that in case of the breakage of the wire springs a it will be impossible for any small part of the wire to come in contact with the rod so as to score the same.

The packing-rings themselves are each made in two sections or parts a, which are approxi matel y semi-annular. One end of each section ping of one ring around 0 is provided with a projecting tongue 0, which is formed intermediate the outer and inner circular faces of the part so as to leave a shoulder on each side of the tongue. The other end face of each section is formed with a recess or-channel 0 which is also formed intermediate of the outer and inner circles of the packing. In both instances the tongues and grooves extend at right angles to the mid- .dle or diametrical plane dividing the two parts of the ring from each other. It will be noticed that the end of each section which is provided with the tongue is cut back a little distance from the diametrical dividing-plane, (indicated by dotted lines in Fig. 3,) while the other end face lies in this middle or diametrical plane. The object of this construction is to give the longest practical bearing engagement between the interlocking tongues and grooves, so as to prevent the rocking or binding of the two sections upon each other, which would interfere with the perfect freedom of movement which I desire to obtain. It will also be observed that the interlocking tongues and grooves formed in each section extend entirely through the thickness of the ring. This is also for the purpose of preventing any lateral binding of one section upon the other, which might be caused by the pressure of steam against the flat sides of the packing. In order to normally press the sections of the ring closely against the red, I employ a spanner-spring (I, which clamps the two sections together. In this packing two such sectional rings are employed and they are arranged at right angles to each other, so as to perfectly break joints, as indicated in Fig. 2. The slipupon the'other is prevented by means of a dowel-pin e. The opposing faces of the tongue 0 and the channel c are ground or scraped smooth, so as to forma perfectly close fitting joint, which continues practically steam-tight since there is no appreciable wear on these surfaces.

By the above-described construction I provide a sectional packing-ring whose members form a perfect engagement with the pistonrod, since no rockingaetion is permitted, while at the same time the construction is such that any objectionable binding of one section upon the other which interferes with their free automatic adjustment is prevented.

Without attempting to set forth minor changes that may be made in the practice of my invention, what I claim is 1. A sectional packing-ring embracing in its construction, two approximately semicircular members whose end faces lie in different parallel planes, one of which intersects the center of the ring the other of which lies in a plane back from the center, the latter face being formedwith a forwardly-projecting integral tongue equal in thickness to the thickness of the ring and adapted to litsnugly into a recess extending entirely through the opposing end of the cooperating member intermediate of its inner and outer surfaces, substantially as described.

2. A packing embracing in its construction a hollow casing or packing-gland provided with a central bore for the piston-rod, packing-rings arranged in said casing to surround said rod, a follower-ring having an annular flange surrounding said rod and extending into a recess formed at one end of the easing, said casing being formed with a series of axial recesses arranged around the annular flange of said follower, spiral springs arranged in said recess to press the follower closely against the packing-ring.

3. A packingembracing in its construction a hollow casing containing sectional packingrings, one end of said casing being provided with a cylindrical recess of relatively smaller diameter than the main casing, said portion of the casing being provided with a series of axial recesses arranged outside of and surrounding said recess, a follower-ring provided with an annular flange projecting into said recess between the peripheral wall of said recess and the rod, and springs disposed in said axial recesses for pressing the follower against the packing-ring, substantially as'described.

In witness whereof I have hereunto set my hand this 4th day of November, 1904.

CHARLES E. BOW EN.

In presence of GEO. N. GODDARD,

KATHARINE A. DUGAN.

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