US1646356A - Packing and method of making the same - Google Patents

Description

1927' N. E. JOHNSON PACKING AND METHOD OF MAKING THE SAKS Filed June 26. 1924 Patented a. 18, 1927.

-: UNITED STATES PATENT OFFICE.

NORMAN E. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO CHIOAGORHOPAC PROD- UO'IS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOISJ;

A PACKING AND METHOD OF MAKING THE SAME.

Application filed June 26,- 1924. Serial No. 722,538.

My invention belongs to that general class of devices known as packing, and relates more particularly to a flexible metallic packing comprising a metallic wear face and a core of an elastic resilient or yielding material. The invention has among its objects the production of apacking of the kind described that is simple, durable, reliable, leakproof, inexpensive and satisfactory for-use l0 wherever found applicable, and a simple,

inexpensive and convenient method of makmg the same. Many other objects and advantages of the construction herein shown v Fig. 1 is a sectional view through a portion of the packing, illustrating a step in'the method of manufacture;

Fig. 2 is a sectional view through a portion of the completed packing; Figs. 3, 4 and 5 are similarviews illustrating other forms;

Fig. 6 is a view in elevation illustrating the packing ring made up of the packing;

Fig. 7 is a sectional view illustrating the modified shape; and

Fig. 8 is a similar view illustrating a thin metallic tube.

Referring to the drawings, in which only the preferred embodiment of the invention is shown, 1 represents a tube preferably of metal and a metal of the kind and grade,

that will be most satisfactory for the purose for which the packing is intended. enerally thistube will be made out of lead or Babbitt material, or material similar thereto, but in some instances it may be made out of other materials such as soft copper, brass and even' fabric, as will be more fully explained hereinafter.

The tube or wear face member 1 may be constructed in any suitable manner of the desired material and of the desired size and shape, which shape and the'tubular bore may be re The metho of making the tube itself will lar or irregular, as desired."

depend upon the material employed. The core 2 may be of any suitable material,

which may be handled in a more or less plastic, semi-plastic, or semi-fluid condition.

t may be rubber, finely ground rubber, rubber compound, or similar material, or it may be cork, asbestos, or the like or combination of the same.

Generally I employ and have found satisfactory a cured crude rubber, the crude rubber being injected into the tube and afterwards cured. I have illustrated in Fig. 1 a spout 3, through which the material to form the core is directed into the tube 1, it being understood that any suitable press or inecting machine may be employed. The opposlte end of the tube is preferably closed, as indicated at 21 after the tube has been .filledand all the air displaced Where the core is to be under compression in the packmg. The core 2 may be applied or injected with as much pressure as found desirable. After the tube has been filled, as the end is closed as indicated at 21, or in an equivalent manner, considerable pressure may be built up in the tube. This pressureexerts an expanding force against the tube. After the tube has been filled with material that rc quires further treatment or curing, as in the case of the crude rubber, then it is subjected to this further treatment while in the tube. In the case of crude rubber, the same is subjected to heat of the desired degree and for the required time to secure the cure which is preferred. This heat, in the case of rubber, is below' the melting point of the tube, as for example, if of lead, and should not be sufficient to break down the tube. After curing, the packing. is then ready for use. I have found it convenient to form the same in a series of spirals like a coil spring, so that the user may out 01f the desired portions. Forming this way, the coil may be made substantially of a diameter corresponding with the rod or box or the like in which the packing is to be used, so as to facilitate handling and installation. Portions may be severed by means of a sharp knife,

. hack saw, or any equivalent tool.

be compressed to this or a different shape.

In Fig. 3, I have shown a modified shape,-

" in which 7 represents the tube provided 'Grooves 9 or of tube, and 12 the core.

with wear faces 8 of increasedthickness as compared with the side portions. merely recesses may be also provided, if ,desired. In this figure, 10 rep-' resents the core of suitable material which has been injected in the tube. With this pzrticular piece of packing either side may employed as the wear ace, or the same may be installed in a construction wherethere may be wear on both sides.

In Fig. 4, 11 represents a modified type In Fig. 5, 13 represents a modified type oftube with an increased wearing face 14, having a modified form of groove or recess'15. The core 16 may be of any of the materials mentioned.

In Fi 8,, there is shown a packing consist- With I ingo the tube 5' and the core 6'. this packing, the tube is shown of comparatively'thin material; for example, this may represent copper,

- material will be particularly satisfactory for a gasket. In Fig.

6, I have shown a ring formed with the packing, and it may be mentioned that the two ends which are brought together to form the ring may be soldered, brazed, or otherwise secured to-' gether at their ]11110l)l11'6 17 if so desired.

This particular type of packing is inexpensive, botlr in so far as materials are con oerned, as well as in manufacturing costs. The same hasbeen found to be of-extremely. long life, or that is, it s particularly durabio and ma es a tight'leak-proof packing. It may be used on reciprocating or rotating parts either in astufiing box or bearing, on

on the. moving part itself, as on a pump plun er, for exam le. It may be used for packing, or itmay e used for wearing faces, or for gasket urposes. It will be noted that'the core is completely "enclosed, and

brass, or the like. This I ing a packing whichconsists in discharging panded form neaasue even if theparts are not soldered together at their juncture, as indicated in Fig. 6, compressing the packing will bring the ends tightly together. Likewise; only the extreme ends of the core would be exposed under any condition. The packing is therefore particularly) satisfactory where the same might be ,rought into, contact with liquids or gases which might otherwise affeet the core material. Where the core is put in under pressure, obviously its tendenc to maintain the packing tight isincrease the core tending to restore the shape of the packing even when the sameis compressed or distorted under pressure. While the packing is not a solid metallic distinguished from a more or less flexible or soft or a resilient packing, this packing has characteristics of both. It has plenty of solid body metal, it is more or less flexible and elastic, it gives hard service and yet parting from the spirit of my invention;

hence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts packing as herein. shown andv described or uses men-- tioned.

WhatI claim as new and desire to secure by Letters Patent is:

1. The herein described method pf formresilient material into a relatively thin casing of pliable, inelastic metal, the resilient material forming a core'which exerts an expansive force against the wall of the easing to normally hold the casing in its ex but allowing the same-to yield under ressure. 4

2. T e herein described method of forming a packing which consists in discharging raw rubber into a relatively thin casing of pliable, inelastic metal and-then heating to cure the rubber the rubber forming a re .sili'ent core which exerts amexpansive force against the wall of the casing to normally hold the casing in its expanded form but .allowing the same to yield under ressure.

=7 In 3 testimony whereof, I have ereunto signed my name. Y ORMAN E. JOHNSON.

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