US1560761A - Variable condenser - Google Patents

Description

Nov. 10, 1925. 1,560,761

L. COHEN VARIABLE CONDENSER Filed June 5, 1922 5 fm1. I

LOMI COHE/l/ Patented Nov.` l0, 1925.

UNITED STATES LOUIS COHEN, OF WASHINGTON, DISTRICT 0F COLMBIA.

VARIABLE CONDENSER.

Application med :une 5, 1922. semi No. 565,920.

To all whom t may concern.'

Be it knownthat LoUIs COHEN, a citizen of the United States, residing at 1656 Euclid Street NW., Washington, D. C., have invented certain new and useful Improvements in Variable Condensers, of which the following is a specification.

This invention relates to variable condensers in general and more particularly to an improved means for adjusting the movable plates of variable condensers.

The object of my invention is to provide a variable condenser of small dimensions and capable of a wide range of capacity variation. Y

f Another object is to provide a variable condenser which is rugged in construction, reliable in operation, and which will eliminate any possibility of short circuits which danger is frequently 'encountered in the usual type of variable condenser.

Other objects and advantages will appear in the description in the specification.

The above objects and advantages have been accomplished by the device shown in the accompanying drawings.

Figupe 1 is a side view of the variable condenser;

Figure 2 is a sectional view of the condenser;

Figure 3 is a plan view of the condenser.

Referring more particularly to the drawings. the device consists of a plurality of fixed plates 1 and movable plates 2. A thin sheet of insulating material 3, preferably composed of mica, is arranged on each movable plate 2; The fixed plates 1 are mounted stationary on supporting members 4 of the casing 5. These supports 4 may all be metal but preferably one only, the remainder beingy composed of insulating material, the metal support connecting all the fixed plates electrically in parallel.

A `centrally disposed partially screwthreaded shaft 6 is arranged in the casing 5, the lower end of the shaft 6 being free t0 turn in the bearing member 26. a bushing 9 forming the bearing for the upper part of the shaft.

An interiorly screw-threaded sleeve 7 is mounted on the shaft 6 in such a manner that as the shaft is rotated the sleeve is raised or lowered thereby, depending upon the direction of rotation 0f the shaft. A plurality of plates 2 are fixedly mounted on vtween the fixed plates.

the sleeve 7 and are arranged alternately with relation to the stationary plates 1.

In order to limit the travel of the sleeve 7 on the shaft 6 a stop lug or disc vor the like 19 is fixed on the shaft 6, limiting such travel by abutting against the upper extremity of the sleeve A suitable gear 10 is fixed on the shaft 6 and meshes with a corresponding gear 13. Gear 13 is fixed on a spindle 22 which is rotatably mounted in the casing top plate 24 and carries a gear 12 which meshes with a corresponding gear 11. Gear 11 is fixed to the sleeve 27 which carries an indicating dial 8. A suitable lmob 18 is arranged 0n the shaft 6 to enable the easy operation thereof.

A lead 15 connects the sleeve 7 to the binding post 16, thereby connecting all the movable plates 2 to said binding post 16. Another binding post 17 is directly connected to the metal support 4 of the fixed plates. The -operation of the device in varying the capacity of the condenser is clearlyunderstood. By turning the :knob 18 and rotating'the shaft 6 a vertical movement of the sleeve 7 is effected, thus moving the lates 2 which are rigidly'attached to the s eeve 7. On the upward motion ofthe sleeve 7, the plates 2 may be brought into close proximity to the Icorresponding fixed plates, the only separation being the thin insulation material 3 which is preferably of mica sheet, and which can be made as thin as desirable within practical limits. Making these mica sheets very thin the plates are brought together ver close and-the capacity for each pair of p ates may be considerable. The several pairs of plates are connected electricall in multiple, thereby giving aconsidera le capacity. On the downward motion` of the sleeve 7 a stop 19 is provided so that the movable plates 2 are carried downward only to about half the distance be- The distances between adjacent fixed plates may be determined so as to make the capacity, when the plates are separated by half the distance between the fixed plates, extremely small. It is quite obvious that with this arrangement there is no possibility of short circuiting because of the mica insulation be-y tween each pair of plates. The gearing arrangementsindicated by 10, 11, 12 and 13 are for the purpose of controlling the travel of the dial 8 and they are so proportionedv ywhich can begraduated in degrees or in' any other desired manner which would give an indication of the magnitude of .the capacity for any position of the movable plates With respect tothe fixed plates. Asmall gear 10 is mounted on the shaft 6 which engages a largegear 13, this gear 13 is mounted on a shaft '22 and on the same shaft aI smaller gear 12 is mounted which engages the larger gear 11, and'this large gear 11 is mounted on a sleeve 9 to which is attachedv the dial 8. By this arrangement the rotary motion of `the shaft 6 is transferred to the dial 8 and a reduced motion is obtained, the diameters of the gears are so proportioned that if necessary even several revolutions of the shaft 6 will effect only half a revolution of Ithe dial 8, so that for the complete travel of the movable plates 2, the dial 8 travels only one half a revolution.

Figure 3 shows a top view of. the condenser in which 23 is an indicated element attached permanently to the case of the condenser, 8 is the dial graduated in degrees, and 18 is the'handle for turning the shaftG. In operation'the handle 18 is turned until the desired capacity within the range of the condenser is obtained and is indicated by the point on the dial facing the zero point marked 23. The dial is originally so set that a minimum capacity is indicated by the zero point on the dial.

Claimsy 1. A variable condenser comprising a plu-- rality of fixed plates, and a plurality of movable plates, sai movable plates being mounted 'on an interiorly screw-threaded sleeve and engaging a threaded shaft, the rotation of said shaft being adapted to reciprocate vertically said movable` plates, and thereby effect various desired degrees of separation between said'movable andr fixed plates of said variable condenser, said stationary plates being provided at their peripheries "withspacing and supporting members.

2. In a variable condenser, an outer cylindrical casing, a plurality of stationary and movable plates mounted therein, a centrally disposed interiorly screw-threaded sleeve, al

screw-threaded shaft mounted therein and adapted toA vertically reciprocate said sleeve sai movable plates bein fixedly mounted on said sleeve and mvab e with said sleeve, v said stationary plates being provided at their y:

Yperipheries vwith spacing and supporting members and said movable plates being adapted to be adjusted with relation to said stationary plates for the purpose of valving the capacity of said condenser, said shaft having a stop mounted thereon limiting the movement of said sleeve, a gear mounted on said shaft adapted to mesh with a second gear mountedon a spindle adapted to rotate 'a third gear, said third gear in turn rotating a fourth gear mounted on a dial-carryin sleeve for the purpose of rotating said in icating dial.

3. In a -variable condenser, an outer casing provided with peripherally arranged spacingl and supporting members, a plurality of insulated stationary plates mounted thereon, a cent-rally disposed screw-threaded shaft, an interiorly screw-threaded sleeve mounted thereon and adapted to bevertically actuated by said shaft, said sleeve being adapted to carry a plurality of movable plates, the movement of said sleeve varying the distance between said stationary and said movable plates and thereby varying the capacity of the condenser..

4. In a variable condenser a plurality of stationary plates provided at their peripheries with spacing and supporting members, a plurality of movable plates vertically alternatively arranged, relative therewith, rotary operating means for reciprocating said movable plates and thereby varying then' respective distances from the adjacent stationary plates, reduction transmission meansy connected to said operating means for imarting a less frequent rotation to a capaclty indicating dial.

5. In a- 'variable condenser a plurality of stationary plates provided at thelr peripheries with spacing and supporting members, aplurality of movable plates vertically al-` .means consisting of an interiorily screwv threadedsleeve adapted to carry said movable plates, and a partially screw-threaded rotary shaft adapted to reciprocate said sleeve. y .y

In testimony whereof I aiix my signature.

LOUIS COHEN.

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