US1635541A - Inductance device - Google Patents

Description

July 12,1927. 1,635,541

F. CONRAD INDUCTANCE DEVICE Filed July 24, 1925 I BY TTYOIRNEY- Patented July 12, 19.21.

UNITED STATES PATENT orrica.

rm; coNa'an, or rrrrsaunen, PENNSYLVANIA, ASBIGNOB 'ro wns'rmenousn nLac'rnIc a murac'ruame comm, a oonroaa'rIoN or PENNSYLVANIA.

DTDUGIAIGI DEVICE Application am m p4, 1m. Serial o. 45,179.

M invention relates to inductance devices,

' particularly to inductors for use with highfrequency apparatus.

It is an object of my invention to produce 5 aninductor in which the losses shall be reduced to a, minimumpeven at very high: fre-z quencies. V

It is a further, object of my invention to provide an inductor suitable for use with heavy currents at high-ire uency.

' It is a further ob]ect of my invention to providemeans'for securing in place a copper strap wound into a coil upon a non-metallic support. v

It is a further object of my invention to provide means by which the windinghmay be out re-i secured upon an insulating core wit sort to varnish or other a hesive.

It is a further object of my mve ntion to provide means by which a winding in the form of-a metallic strap and a core in the form of a vitreous or other frangible substance, may be securely united.

Other objects of the invention and details 26 of the construction will be apparent from the following description and t e accompanying drawing, in which Figure 1 is a side view, a portion of the strap being broken away.

.30 Fig. 2 is an end view, and

- Fig. 3 is a detail showing the strap in sec-' tion. s

The core or support upon which the coil is wound is preferably in the form of a cylinder, although the, IIIVGIItlOIllS applicable" to an. columnar form. In the form illustrat the sup ort is a hollowcylinder 1 of an suitable su stance, such as fused quartzz,

e outer surface of the cylinder is-pro- 40 vided with a groove 2. If the cylinder is made by casting or molding, the groove may be formed at the same time.- Ifv the substance of which the cylinder is made is such that the groove cannot be thus formed with sufiicient accuracy, it"may made or finished byTgrinding.

causes little dielectric loss, even, when subjected to intense fields at high frequency.

Because no cementation material is present, no dielectric losses are introduced by the means fastening the winding to itssupport.v

A cylinder of vitreous or mineral substance, such as marble porcelain or'fused quartz is i beat adapted ior large sizes" For sma 'er upon the core.

said support.

sizes, hard rubber is suitable When the of copper. The strap is provided with'an at offset rib or groove 6 which extends lengthwise of the strap. 1 As the stra is wound upon the cylinder, the offset 6 ts into the groove 2 and properlyvpositions the winding At one end the strap is secured to the c linder by a binding post 4 andv at the ot er .end by another binding 0st. Other bind- 1 ing posts may be provi' ed beside the end 'ones and, when so provided, the st ap should be perforated to receive them., he several binding posts afi'ord convenient means for attaching the conductor bywhich current is brought to the inductor. By changing suchconductors from one binding post to another, i

the number of turns inthe inductor may be altered.

It will be apparent to those skilledin the art that many modifications may be made without departing from the principles of this 86 invention. The specific illustration and de'-' scription of a single "form is, therefore, not

:to be considered, a limitation; I

. 'I claim as myinvention:

1. In a coil, a support, a flat conductive o strip having a longitudinally depressed por tion. wound along said support, and means extending along said su(ppo rt in-juxtaposi tion to a portion of sai strip between the edges thereof for positioning. said strip upon 2. In a 0011,41. conductive ribbon, said ribbon having "a longitudinally extending offset portion, a support, and. means 'on sai support co-operating with said oflsetporo ort. t a

'3. A coil silipport comprising a hollow cylinder of ins ating material having small dielectric losses; said cylinder having a heli- 106 cal groove of arcuate cross section and opena circuit connecting device. no

, tion for positioning said ribbon on said sup e cylinder must be of a'material which p .x. In combination, e coil su port comprising a hollow cylinder of insu atin material having small dielectric losses, sai cylinder having a helical groove of arcuate cross secf tion, a conductive strip having an ercuete I 5.- An an article of manufacture, a conduc- 10 tive ribbon having a longitudinally extendin'g depression adapted to cooperate with a supporting structure and to strcngtl'ien said ribbon against bending.

In testimony whereof, I have hereunto 15 subscribed my name this 8th day of July,

FRANK CONRAD.

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