US886824A

US886824A - Choke-coil.

Info

Publication number: US886824A
Application number: US39591707A
Authority: US
Inventors: Louis O Langworthy
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-10-04
Filing date: 1907-10-04
Publication date: 1908-05-05
Anticipated expiration: 1925-05-05

Description

INVENTOH ATTORNEYS MOW. M, Li H M WW m N m a m r W 5D i P. C Y W F D :3 F W WW Wm WWW j E mi J. w x: m a F, W H P a w w I 7 2%? m 5 N Y WITNESSES ment of the cores.

.coils.

range of the coils may be obtained between the maximum and minimum movement of the cores. This adjustment of the terminal voltage is a vital point in my invention, as in the ap lication of the coil it is necessary to vary t e current, i. c., the voltage at the terminals of the coil, from the fact that it is necessary to have diilerent degrees of light at the picture. Some picture films are very dark and some light, and hence the current supplied to the lamp must be increased or decreased to provide for this variation.

There are several difierent methods which may be employed to accom lish the adjust- That s own in Figs. 1 and 1 is deemed the simplest and best and is made by the simple adjustment of the clamping nuts. The coils and cores, however, may be adjusted to and from each other by any suitable means.

The coils are so designed that the total losses do not exceed 250 watts, suilicient radiating surface being provided to take care of this heat loss.

As to the detail construction of the coils, the cores are made up of about 200 sheets of transformer iron of L-shape form seen in Fig. 2. This L-shape form prevents excessive leakage through the ends of the copper in the copper coils and hence excessive heating. The iron cores are assembled as shown in Fig. 2, the idea being to so lead the magnetic lines around the iron and across the air ga with minimum leakage.

he coils are form-wound and are placed over the cores and held in position by the porcelain cleat F, securing the terminals J, c of the coils.

As a modification o my invention, the design of the cores may be changed to the form shown in Fig. 3, in which A, B represent the cores in which the variable air gap is formed by means of the armatures R and it. This form requires separate iron armatures either at one or both ends of the cores. The adjustment of the terminal voltage is limited to the distance apart oi" the iron cores, for when the armatures are moved beyond the distance apart of the cores, the magnetic lines leak. across the cores, causing excessive heat in the coils and so limiting the variation of Such leakage causes eddy currentsthe voltage. This form of coil, however, is not so desirable as that shown in Fig. 2,'in which the L-shape core is ideal in respect to the adjustment and leakage; for in the latter form as the cores are separated, to give greater current, the coils are also separated, increasing the effective radiating surface for the heat, at the same time the heating effect would be increased by the passage of the larger current. The magnetic leakage is not increased, as the end of the alwa s the closest to the other core.

I c aim 1. A choke coil comprising two cores with coils wound thereabout, and means for holding the same in a predetermined relation and adjusting one core and coil to the other core and coil to 1produce a variable air gap.

2. A cho e coil comprising two cores each having an L-shape extension arranged at opposite ends to each other, two coils embracing said cores, and means for clamping the coils and cores in variable relation to each other to reduce a variable air gap.

3. A c oke coil comprising'two laminated cores each having an L-shaped extension arranged at opposite ends to each other, two

coils embracing said laminated cores, and

means for clamping the coils and laminated cores in variab produce a variable air gap.

4. A choke coil comprising two. laminated cores each having an L-shaped extension arranged at opposite ends to each other, two coils embracing said laminated cores, two clamps for each end of the cores with clamping bolts for securing them to ether, the said ends of the cores being extended beyond the coils and retained in adjustable position between the clamps with a variable air gap between them.

5. A choke coil comprising two cores, two coils embracing said cores, two clam s for each end of the cores with clamping bo ts for securing them together, the said ends of the cores being extended beyond the coils and re tained in adjustable position between the clamps with a variable air ga between them.

LOUIS 0. LA GWORTHY.

Witnesses:

M. D. Burrme'ron, G. R. KNIGHT.

L-shape core is e relation toeach other to