US1651713A - Transformer construction - Google Patents

Description

Dec. 6, 1927. 1,651,713

I J. KARAS mmsvonmsn cous-rnucnom Fild Jan.28, 1924 INVENTOR a Xvxc ms Patented Dec. 6, 1927.

UNITED STATES JOSEPH KARAS, oF CHICAGo, ILLINOIS.

TRANSFORMER CONSTRUCTION.

Application filed January 28, 1924.

a transformer construction of the character described in which a novel means is employed for closely binding the superimposed lamina ofthe laminated core 111 close engagement with one another, thereby assurmg a uniform and intense tiel d through and about the core.

A further object of my invention isto provide a device of the type described in which the necessity of cutting away portions of the core for the introduction of binding bolts or rivets is entirely precluded. This structure assists materially in supporting maximum strength in the magnetic field about the core.

A further object of my invention is to provide a device of the type described in which the core as Well as the primary and secondary windings are entirely encased and in which novel means is employed for supporting the core and windings at a spaced distance from the Walls of the casing.

A further object of my invention is to provide a device of the type described in which the end pieces forming a part of the transformer casing perform a dual function, i. e., that of binding the lamina of the core together and of supporting the core and windings free of contact with the metal walls of the casing.

A further object of my invention is to provide a device of the type described which is compact in form, durable, and thoroughly practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings forming part of this ap plicatiou, in which Figure 1 is a side elevation of an embodiment of my invention,

Figure 2 is an end elevation of the mechanism illustrated in Figure 1,

Figure 3 is a. sectional View along the line 3-3 of Figure 1, and a Figure 4 is a sect'onal view along the line H of Figure 2.

In carrying out my invention I make use of a laminated core 1 comprising a plurality Serial N0. 688,925.

of superimposed lamina of soft sheet iron. The core 1 is substantially rectangular in contour and nearly equilateral in cross section.

A primary and a secondary winding, one concentric with the other are disposed as shown at 2 upon one of the longer branches 3 of the core 1.

Means for encasing and supporting the core 1 with its windings 2 provided in a metal cylinder 4 and a pair of end closures or end plates 5 arranged to partially encompass the peripheral edges of the cylinder 4.

These end plates 5 I deem of great importance, since their use enables one to dispense with certain disadvantages ordinarily found in transformers employing laminated cores.

From an inspection of Figure 4 it will be noted that each of the end plates 5 is provided with transversely disposed outwardly extending substantially horizontal indentures 6. It will be further noted that the indentures are of lesser width at the innermost or remote end than at that portion which merges with the vertical face of the end plates. This construction necessarily provides inclined side walls 7 forming a part of the indentures.

The width of the indentures 6 at the remote ends thereof is slightly less than the thickness of the superimposed lamina forming the core 1 when fully compressed.

The rods 8 are projected through the upper and lower parts of the end plates 5 and serve to provide a means for drawing the end plates toward one another and consequently the core 1 toward the innermost end of the indentures 6 in the plates, whereby the core 1 is maintained in a tightly com pressed condition.

The grip of the plates 5 upon the core 1 serves also to maintain the core 1 against lateral movement and therefore keeps the windin 2 out of engagement with the cylinder 4-.

Suitable binding terminals 9 are provided for connection of the windings 2 to extraneous apparatus.

Supporting members 10 are formed. integral with the end plates 5 and serve to provide adequate means for fixing the transformer to a supporting surface or panel.

From the foregoing description of the various parts of my invention, it will be noted that- I have provided in a t ansformer construction a casing in which the end plates forming part thereof perform a dual function and entirely preclude the disadvantages brought about in irregular magnetic flux or tield structure usually found in 'anstormers having a core of irregular or mutilated character.

I claim:

1. In a transformer of the character described having a core comprising a plurality of superimposed lamina, of a pair of 00- operating supporting plates each having an indentiire for partially receiving the opposite ends respectively of said core, said plates having the indentures therein formed with inclined side walls, whereby said lamina are forced into close engagement with one another as said plates are drawn toward one another.

2. In a tlflllSfOllllGl oi? the character described having a core crun jn'ising a plurality of superimposed lamina of a pair of (:0- operating diametricallv disposed end. snpporting plates each having an indenture for partially receiving the opposite ends respectively of said core, said plates having theindentures therein formed with inclined side walls whereby said lamina are forced into close engagement with one another said plates are drawn toward. one another. and means for drawing said. plates toward one another.

A transformer of the character described compr'sing a plurality of superimposed magnetizable lamina, current conducting coils wound upon said lamina, a cylindrical shell encompassing said lamina and said coils a pair of end plates for the ends of said shell, said end plates having indcntnrcs in the inner walls thereof providcd with inclined side walls, the width of Eiilltl indentures being less at the inner ends than the thickness oil said superimposed lan'iina when uncompressed and means for c.-..l1'l f said end plates toward said core and toward. said shell whereby the lamina will be tightly compressed and held against movement with respect to said shell.

i. A transformer of the character de scribed, comprising a plurality of superimposed n Inetizable lamina, a current coninding disposed upon said lamina,

ducting w a tubular shell encompassing said lamina and said winding. a pair of end. plates for the ends of said shell, said end plates each having an indcnturc in the inner wall thereor provided with inclined side walls, the width of said indentures being less at the inner ends than the thickness of said superimposed lamina when uncompressed, and means for drawing said end plates toward said core and toward said shell whereby the l: inina will be tightly compressed and held against movement with respect to the shell.

JOSEPH KARAS.

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