US1340812A - Process of manufacturing insulators - Google Patents

Description

P. J. H. BERNARD.

PROCESS or MANUFACTURING msumons.

APPLICATION mm PAN/29,1919.

Patented May 18, 1920.

% Ill/HUN umwmumm m I1)WWI!IHIMUMLUJJMEEZ PIERRE JOSE-PH HENRI BERNARD, F -MON'1REAL, QUEBEC, CANADA.

PROCESS OF 'MANUFACTURING INSULATGRS.

Application filed May 29. 1919.

To all whom it may concern Be it known that I, Pruner. J OSEPH HENRI BERNARD, a subject of the King of Great Britain, residing at Montreal, Province of Quebec, Canada, have invented certain new and useful Improvements in Processes of Manufacturing Insulators; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to the man nor of making insulators and more particularly to a process for making insulators from commercialized sheets of mica. The purpose of the invention is to provide a mica insulator which, when formed, will be a solidified mass obtaining a higher degree of insulation value.

With the above and other objects in view which will hereinafter appear as the description continues, the invention consists of the novel features of construction, combination and formation of parts as will be hereinafter more fully described and particularly point- I ed out in the appended claim.

In the accompanying drawings Figure 1 is a plan view of one of the mica disks;

Fig. 2 is a sectional view of the disks as placed upon a metallic bar showing the first operation of the process;

Fig. 3 is a similar View showing the mica disks after being subjected to heat and pressure;

Fig. 4 is a similar View with a part thereof in elevation showing the insulator when formed in a solid mass;

Fig. 5 shows the manner in which the spiral grooves may be formed within the insulator; and,

Fig. 6 is a side elevation of the insulator when completed.

Referring now more particularly to the accompanying drawings wherein like and corresponding parts are designated by similar reference characters throughout the several views,

In the manufacture of mica plates suitable forinsulatingmaterial,the plates are formed by taking a plurality of superposed layers of mica scales. which are covered with a finely powdered gum or rosin and then subjecting the mass to heat and pressure to form the mica plates. These mica plates Specification of Letters Patent.

Patented May 18, 1920.

Serial No. 300,653.

are commercially available at the present time but are not suitable for insulators which require a very high degree of insulation value, due to the fact that when the coating of gum and rosin upon the plates is heated to a very high degree, the coating will expand causing the means of mounting the insulator to give and at most times break.

In the forming the insulator embodying the present invention, these plates of commercialized mica are cut to form the disks as shown in Fig. 1. These disks are then placed upon a metallic bar 10 between a stationary flange and the adjustable flange 30. A nut having screw threads meshing with the metallic barlO is provided for adjusting the flange 30. This bar 10 having a plurality of mica sheets thereupon, as better illustrated in Fig. 2, is subjected to a red heat and at the same time the nut 40 is tightened so to obtain a high degree of pressure upon the mica plates. By subjecting these mica plates to heating pres sure the gases arising from the coatings from the plates which consists of gum and rosin, will escape and leave a residue of carbon which would not expand. Ofttimes, in subjecting these mica plates to the first operation of heat, and also subjecting the same to pressure, the bar 10 breaks as the coating upon the mica plates has a tendency to expand when being heated, and the mica sheets are subjected several times to this heating and applying pressure until they eventually form in a position upon the bar 10 as shown in Fig. 8, and finally the mica is formed in a compact and solid block as shown in Fig. 4, as the gum and rosin con tained on each sheet of mica have been taken out. This solid block of mica as indicated by the numeral 50, in Fig. 5, is placed upon a rod where the spiral grooves are formed in the periphery thereof as shown, subsequently forming the finished article as shown in Fig. 6, which is a very sufiicient insulator having a very high degree of insulation value and very strong and durable. The grooves formed within the periphery of this block of mica, are for the reception of a high resistance carbon or coil.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is 2-- A process of making insulators consisting in arranging a plurality of mica sheets each containing a coating consisting of'gum on a lathe, to provide a continuous spiral and rosin upon a supporting bar, repeatedly groove for the reception of the resistance subjecting the mica sheets to heat and preselement. 7 V V sure whereby the gases from the coating of In Witness whereof I have hereunto set 5 gum and rosin will escape and the mica my hand.

sheets reduced to a solid consistency and a 7 then turning the resultant solidified mass PIERRE JOSEPH HENRI BERNARD.

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