US1707346A - Water-meter disk - Google Patents

Description

Patented Apr. 2, 1929.

. NELSON C. COTAIBISH,

ENT, OFFICE.

or nxnwoon, onto.

WATER-METER DISK.

No Drawing.

This invention relates to a material which is insensitive to temperature changes or exposure to moisture and is particularly applicable to disks such as are used in Water meters and the like. u

I-Ieretofore disks for such use have been made from various materials, most generally of hard rubber or other rubber compound. Rubber possesses a certain advantage in thatit is of non-corrosive character but it, as Well as most other materials, possess certain disadvantages, in that it cannot Withstand the effect of heat and will become Warped and otherwise distorted when the temperature is raised above a normal limit. Inasmuch as water meters are often subjected to the action of hot water, and even steam, through care-- lessness of the consumer in controlling hot water appliances, there has been frequent trouble from Warped disks in the meter.

In my prior Patent No. 1,182,354, patented May 9, 1916, 1 disclosed a disk made of carbon and a coked binder which obviated certain of the defects of the prior disks in that it Was insensitive to tel'nperature changes met in practice and retained its shape regardless of the ten'lperature of the water passing around it.

The present invention is an improvement upon the invention of my patent above mentioned and has among other objects, that of retaining the advantages of the disk disclosed in the patent While increasing its durability.

Other objects will hereinafter appear.

The invention will. be better understood from a description of one practical embodiment thereof and the manner in. which the same is produced.

In my rior disk, which has been found very satis actory, the disk was first formed as disclosed in my above mentioned application, that is, carbon flour, such as that obtained from coke or lampblack, is mixed with sufficient pitch or tar to render it plastic under heat when molded, approximately to percent of carbon flour being mixed with 15 to 10 percent of powedered pitch, and after being thoroughly mixed the mixture is subjected to pressure in a suitable mold until densely compacted in the desired form. During this operation the mold is heated to a suflicient ten'iperature to soften the hard. pitch and cause it to flow and envelop the carbon particles, thus binding thematerial to Application filed May 14,

1927. Serial No. 191,540.

gether. The disk'is then removed from the mold and baked in a furnace at a temperature which will set the binder and cause the carbon particles to be rigidly coked together. Binders other than pitch may be used, tar and saccharine solutions being suitable, or any other material which will carbonize and coke the carbon particles together in the manner above described.

In the present embodiment, after the disk has been formed, as above described, it is impregnated with a somewhat elastic or re silient material which fills the interstices and renders the disk much more durable when subjected to impact. Materials which have been found suitable for this purpose are rubber, bakelite, celluloid and the like. lhe resilient substance may be forced into the in terstices of the disk in any well known or desired manner,as by pressure or under a vacuum, and may thereafter be cured or vulcanized by being subjected to heatand/or pressure is well understood in the art. Any temperature reached in curing or vulcanizing such substance is far below any temperature at which the carbon disk will be come distorted or changed.

The resilient material not only increases the durability of the disk but may be chosen to improve the appearance thereof and also renders the disk more impervious to the pasof liquids therethrough than it was before.

While I have mentioned a few compositions which embody my invention, these are described by Way of illustration only and not by way of limitation, and it is obvious that many other embodiments will. readily occur to those skilled in the art to which this appertains. I do not, therefore, limit myself to the precise materials described but claim as my invention all embodiments thereof coming within the scope ofthe appended claims.

I claimz 1. A disk for water meters coin 'nrising a coked body of carbon impregnated with re silient material,

2. A disk for water n'ieters and the like, consisting of carbon particles held together by a coked binder, and a resilient material filling the interstices of said coked material.

3. A disk for water meters and the like, comprising a rigid form-sustaining base of carbon, ancl'a resilient material permeating comprising a porous, rigid, form-sustaining the interstices of said carbon base. carbon base, the interstices of which are filler] 4. A disk 91 water meters and the like, with vulcanized rubber- 10 comprising a, porous, rigid,form-sustaining In testimony whereof I hereunto aflix my 5 carbon base, the interstices of which are filled signature this 10th (lay of May, 1927.

v with rubber.

5, A disk for wate meters and the like, NELSON c. COTABISH.