US1660938A

US1660938A - Semimetallic packing

Info

Publication number: US1660938A
Application number: US127583A
Authority: US
Inventors: Samuel R Slaymaker; Walter Robison
Original assignee: US ASBESTOS Co
Current assignee: UNITED STATES ASBESTOS Co; US ASBESTOS Co
Priority date: 1926-08-06
Filing date: 1926-08-06
Publication date: 1928-02-28
Anticipated expiration: 1945-02-28

Description

so inside of the ring.

i Patented Feb. 28, 1928.

UNITED STATES .N 1,660,938y PATENT OFFICE.

SAMUEL B. SLAYMAXER, F LANCASTER, AND ROBISON WALTER, 0l mmm,

IPENNSYLVANIA, ASSIGNORS TO UNITED STATES ASBESTOS GOHPAN'Y, 0, m- A HEIM, PENNSYLVANIA, A `C0ItIOItA'IIt'.)IN' Ol' PENNSYITANIA.

SEHIMETALLIC PACKING.

Application iled August 6, l19526. Serial lo. 187,588.

Our invention consists in the novel features hereinafter described, reference beinv had to the accompanying drawing which shows the preferred form in which We have embodied our invention, and a slight modification thereof, and the said invention is fully disclosed in the following description and claims.

Our invention consists in a novel semimetallic packing, comprising among its members a channeled casing member formed of compressible material, as for example layers of asbestos cloth, cotton duck, or the like, with or without metallic wires twisted with l5 the yarn or otherwise incorporated, said layers being preferably frictioned with rubber or other vulcanizable material and vulcanized, although the casing member may be of plastic material molded and hardened to the desired degree. On one face'of this casing a channel is formed, the'lateral faces of which are preferably dis osed angularly to each other, so as to pro uce a reentrant wedge shaped recess or V-shaped recess in cross section. This recess may be dry, but is preferably lubricated with graphite or other suitable material, and the casing is flexible so that it may be bent or curved into ring or spiral form with the channel on the Within the channel of the casing member is fitted a longitudinally extending metallic block member composed of non-friction metal preferably in a divided condition as wires twisted or braided or otherwise assembled,y or small pieces, blocks or slugs of metal, so arranged as not to interfere with the bending of the entire packing into ring or spiral form. This block member is also of wedge shape to fit the channel and project slightly therefrom, and the longitudinal apex or inner edge of the block member is preferably formed of non-metallic material as fabric orr composition with or without metallic wires,` to facilitate the proper sliding of the block member with respect to the casing member. The metal block member is preferably charged with lubricant` and the whole packing is held assembled in any desired manner which will not interfere with the proper movement of the metallic block member in the channel for the proper. functioning of the packing as by braiding any suitable material around it.

In the accompanying drawings,

Fig.\1 represents a piece of our improved packingbent into ring form with the ends apped. t l

Fig. 2 re resents a cross section of the packing on t e line 2-2 of' Fig. 1.

Fi- 3 represents a view of a portion of the packlng before the braided cover is attached.

Fig. 4 represents a longitudinal section on the line 4--4 of Fig. 3, with the braidedcover attached.

Fig. 5 is a longitudinal section on the line 5-5 of Fig. 6.

Fig'. 6 represents a cross section of the construction shown in Fig. 5.

Referring to the accompanying drawings, 1 represents the channeled casing member, 7 formed in this instance of layers of asbestos cloth with or without metallic wiires indicated at l", permanently united which may be convenientl accomplished by fric-` tioning the cloth wlth rubber or other vulcanizable material and vulcaniz'ing the casing member, but this casing member may be formed in other ways. For example, the asbestos cloth may be united by other adhesive means, or the casing member may be formed 9 of duck or other cloth with or without metallic wires in layers united by rubber and vulcanized or unlted by other plastic material, or the casing member may be formed of a plastic material moldedinto the proper channeled shape land hardened to the desired degree and where the casing member is so formed of plastic material, it may be reinforced in any desired way as by threads, fabric, or even wlre, if desired. 2 represents the lon tudinal channel formed in one vface of t e casing member, and being preferably V- shaped or wedge shaped as shown. In any event, it is referable to have the sides of the channel inclined to each other and flared from the inside outwardl to facilitate the relative movement of t e metallic block member with respect thereto, but we prefer to make the channel in the form of a V in cross section. 3 represents the metallic block member which is co-extensive longitudinally with the casing member, and is formed almost entirely of non-friction metal. The metal parts may be in the form of wires, 3, united by braiding, twisting, or in Aany other desired manner, and pressed into the lproper form to fit the channel between the mclined faces thereof. Instead of having the metallic portions of the block member extend to the inner edge or apex of the channel, this portion of the block member indicated at 4, and which we term for convenience the apex ofthe block "member, is

preferablyformed of non-metallic material pas fabric orv compressible composition i `'with or `-without metallic wires. The purose of providing the metallic block memer with `the non-metallic iexible or compressible apex portion is to facilitate the prcper sliding of the metal block member in a irection from and toward the casing member, in the channel of the latter. It' the apex were of metal there would be variations in the density of the metal block as it.

compressed in use, and this is avoided by the provision of the non-metallic compres- -tions of solid pieces or slugs of metal, as indicated in Figs. and 6, in which thecorre ending portions of the packing shown insiFigs. 1, 2 and 3 are given the same numerals with 100 added, to avoid unnecessary description.

In Figs. 5 and 6, the metallic portions of the block member indicated as a whole at 103, are composed of metal slugs or pieces,

.103, so assembled as to permit of the bending coiling or spiralin of the packing and thesaid bldck member lis shown as proiiided with the non-metallic apex portion indicated' at 104, fitting in the bottom of the recess, 102, in the casing member, 101. One reason why we prefer to construct the metallic block member of braided metal wire is, that itprovides storage space for lubricant between the wires and adds to the effectivenessof the packing. The entire packing ncluding the casing member and the metallic cover or enclosin block member are preferably united by a Figs. 1 and 2. p his cover may be conveniently formed by braiding with any suitable thread or material, but it is not essential, and the casing member and metallic block member' may be united in any other suitable manner, which will not interfere with the roper movement of the metallic block mem* lier in the channel of the casing member, or the roper Contact and functioning of the pa'ckrn with respect to a rotating or sliding rod, w ich it may surround. The cover might be dispensed .with altogether so far as the effective operation of the packing is concerned, but for commercial purposes it is desirable to unitethe members of the member indicated at 5 in.

packing in a unitary structure for convenience in handling and transportation, and this is most conveniently done by a cover around them. A covering could be wound around them spirally, or they may be held together in any other desired manner as by threads more or less openly braided `or surrounding the packing at intervals. Our ilnproved packing is manufactured in lengths of any desired extent, and in usea section is cut ofi' suiicient to form a ring with buttcd or overlapped ends as preferred, or a spiral, to beput in a stufiing box around a sliding or rotating device, or rod, and compressed byl the gland or follower' of the stuffing box in the direction of the arrow at a; in Fig. 2. The metallic block member cannot' be crushed, but will slide in the direction of the arrow, b, in Fig. 2, intocontact with the rod or the other device to be packed, which will revolve within it or slide through it effectively, while the escape of Huid, whetherliquid or gaseous, is efficiently previented.

As the metallic block member .is at all times capable of movement inwardly as well as outwardly in the channel, 2, which is f preferably althou h not necessarily lubricated, the effect o high pressure, liquid or gaseous material exerted on the packing in the direction of the arrow, a, would naturally tend to force the metallic block member into closer contact with the rod or other movable device to be packed, while when the pressure is withdrawn as on the return stroke of a piston, the reduction of pressure would permit the metallic block member to recede into the channel and relieve its friction on the movable rod or part to be packed. This action is termed breathing of the packing, and our improved packing is extremely eiicient in providing for this breathin of the same.

As the ace portions of the metallic block member become worn, and the glands or followers are drawn down to expand the packing laterally and keep it in fiuid tight contact with the rod, it will beseen that the metallic block member slides outwardly in the direction of the arrow, b, in Fig. 2, and cannot be crushed or distorted, thus retaining all the ordinary advantages of the packing, and compensating for wear. By roviding the metallic block member wit a non-metallic apex portion, 4, the metallic portion, 3, is enabled to retain substantial uniform density throughout, notwithstanding the fact that the apex portion ma be considerably compressed and distortedy by reason of the fact that it occu ies the narrowest portion of the channe, and while compressibility or elasticity of this apex portion facilitates the natural movements of the metallic portion in and out of the channel, or in other words the breathing of the ackin If the metallic portion of the bloc mem r were carried to the extreme bottom or inner end of the channel, the compression of the packing its density and interfering with the freedom of movement of the metallic block member with respect to the casing member.

What we claim and desire to secure by Letters Patent is 1. The herein described packing comprising among its 4members a casing member composed mainly of non-metallic compressible material, and provided on one face with a channel tapering inwardly in cross section, and having its lateral faces inclined to each other, of a metallic block member com osed of non-friction metal in divided con ition,

the particles whereof are capable ofmovement with respect to each other to permit ofthe coiling, spiraling, or bending of the acking, said block member having inclined Fateral faces to fit the faces of the said channel, and a substantially triangular mainly non-metallic member extendin longitudinally of the block member and n tting the inner ortion of said channel.

2. The erein described packing comprising among its members a casing member formed mainly of non-metallic compressible material, and provided with a longitudinal channel on one face substantially V-shaped in crossl section, a metallic block member composed substantially of non-friction metal wire, and having inclined lateral faces to fit and slidin ly engage the sides of the said channel, an a longitudinally extending compressible member enga ed with the inner edge of the block mem r and fitting the inner portion of said channel, said member being composed mainly of non-metallic compressible material.

3. The herein described packing comprising among its members' a casing member com osed of layersof fabric united into a soli compressible body, and provided on one face with a substantially V-shaped longitudinal channel, and a substantially trapezoidal metallic block member composed of non-friction metal in divided condition, and having a longitudinally disposed apex memin the stuing box would tend to pinch this portion increasing tures.

ber composed mainly of non-metallic mate- I formed separately therefrom, andcomprising non-friction metal wires, and a longi-` tudinally disposed substantially triangular member composed mainl of non-metallic material, said block mem er having its lateral faces disposed angularly to each other to fit movably in said channel, and means for retaining said members in associated relation.

5. The herein described packing comprising among its members, a casing member composed of layers of asbestos woven fabric united by vulcanized material, and provided with a "substantially V-shaped longitudinal recess on one face, and a metallic block member formed separately therefrom, and comprising non-friction metal wires, and a longitudinally disposed substantially triangularjmember composed mainly of non-metallic material fitting the apex ortion of said recess, said block member aving its lateral faces disposed angularly to each other to fit movably in said channel, and a. braided covering surrounding said members and holding them movably in assembled relation.

6. The herein described packing comprising a casing member composed of compressible material and provided on one face with a channel substantially V-shaped in cross section, a substantially ti'apezoidal metallicA block member fitting the outer portion ofv lar said channel and substantially trian compressible member engaging the inner face of said block member and-fitting thel apex portion of said channel.

In testimony whereof we aix our signa- SAMUEL n sLAYMAKER. RoBisoN WALTER.