US1651975A - Variable condenser - Google Patents

Description

Dec. 6, 1927. 1,651,975

r -H. M. SPECHT v VARIABLE CONDENSER Filed Dec. 19. 1923 2 Sheets-Sheet 1 i )J INVENTOR Dec. 6, 1927.

1,651,975 H. M SPECHT VARIABLE CONDENSER iled Dec. 19. 1925 2 Sheets-Sheet 2 Q 7 v M INK: VENTOR 7 BY M M between the stator plates it they are slightly Patented Dec. 6, 1927.

UNITED STATES PATENT OFFICE.

HARRY MORTIMER SPECHT, OF PELHAM, NEW YORK.

VARIABLE oonnnnsnn.

Application filed. December 19, 1923. Serial No. 681,483.

This invention relates to a variable condenser and the novelty consists in the adaptation and arrangement of parts as will be more fully hereinafter pointed out. i There is a tremendous demand among those using radio receiving outfits for an efficient variable condenser which will give service at all times. Variable condensers now on the market are made up of two series of flat plates, one series being rigidly secured in position and called a stator series and the second series being rigidly secured to a rotatable shaft and adapted to rotate into position between the stator plates,

which series is known as the rotor series;

These plates are usually madeof aluminum and although absolutely efficientin handling E. M. F. they do not stand up in'service as they are readily bent'out of exact position and more readily this applies to the rotor plates so that-in rotatingto the position in out of true they will cause a slight contact which absolutely destroys the efliciency of the variable condenser.

My device overcomes this weakness and fault in the variable condensers now on the market by constructing the stator and rotor plates in such a form that they will have substantial strength so that they will not easilyor readily bend out of shape, but will withstand all ordinary usage and ordinary abusage, to which they may be subjected in the hands of the amateur radio operator.

My variable condenser also is adapted to sul' s:tantiall y increase the amount of plate space for holding the electrons and protons, doing so in a reducedspace so that it is more highly e'tlicient handling E. M. F. than the vari able condensers now on the market.

My device also adapted to contain a variometer within itself so as to effect econoiny of space in operation. It likewise has a vernier adjustment so that the finest adjustments can be attained with my device and the combination results in a wider range of adjustments than is possible on any variable condenser heretofore known.

Referring to the drawings, Fig. 1 is a perspective of the exterior of my device;

Fig. 2 is a vertical section through the center of Fig. 1;

Figs. 3 and 4 are details of the shaft constructions used in my device; and

Fig. 5 is a perspective of my device showing the rotor space of concentric semi-spherical cup members partially interleaved with the stator series and part of the same being broken away in order to show this inter leaving, and also showing a vernier in combination therewith in partial cross section.

In'thedrawings 6 is a tubular rotatable shaft to which a series of concentric semispherical cup members 7 are rigidly secured so as to rotate therewith. A tubular shaft 8 is adapted to be mounted over the shaft 6 and a second series of concentric se1ni-spher ical cup members 9 is rigidly secured to said shaft 8. The tubular shaft 8 has semi-circular cut out portions 10 through which the series ofcon'centric semi-spherical cup members 7 are adapted to pass, said cup me1nbers 7 being insulated from possible'contact with said shaft 8 and saidcup members 9 beinginsulated against-possible contact with shaft 6, and the air serving as the dielectric as iii-the usual flat plate construction of variable condensers. A shaft 20 is mounted in shaft 6 and is broken off at the outer end where it is controlled as to independent rotation and is connected to the E. M. F. A suitable connecting terminal 11 is secured to the shaft 6 so that connection with the usual source of power may be effected and a suitable connecting terminal'lQ is secured to the shaft 8 so that a suitable connection can be made to the source of power by this means.

A variometer 13 of usual construction may be mounted in my variable condenser with a rotor portion mounted to turn with shaft 20, as shown in Fig. 2.

A control means of usual construction having a regular adjustment dial 15 rigidly secured to the shaft 6 and a fine adjustment or Vernier dial 16 is adapted to be mounted as shown in Fig. 5, having a plate 18 connected through a contact pin 17 to the series of concentric semi-spherical cup members 9 and the second plate 19 being connected directly through the shaft 6 to the other series of concentric semi-spherical cup members 7.

The concentric series of semi-spherical cup members 9 is a stator series as it does not turn, but is rigidly secured in the fixed position, as indicated, being connected with the tubular shaft 8 which in turn is connected to the electrical circuit by means of connecting terminal 12. The series of concentric semi-spherical cup members 7 is a rotor series, which, being rigidly connected to the shaft 6 rotates from the position shown in Fig. 2, which is the minimum capacity or open position, to a position where all the se-- ries of concentric semi-spherical cup members 7 are fully interleaved within the series of semi-spherical cup members 9, which is the maximum capacity or closed position. This movement is made possible by the slots 10 which permit the rotor series 7 to rotate a complete semi-circle, so as to effect this operation.

In using my variable condenser, the usual methods of operation will be followed as the turning of shaft 6 will effect the adjustment sought and'the adjustment of variometer 13 will be effected by turning shaft 20. .The Vernier adjustments will be used through the dial 15 in the ordinary adjustment and through the dial 16in making the final or finer adjustments.

I claim:

1. A variable condenser comprising a series of concentric rotor semi-spherical cup members, a series of concentric stator semispherical cup members and means for turn spherical cup members and means for turning said rotor cup members into and out of full interleaved relation between the corresponding stator cup members in combination with a variometer encased by said stator and rotor cup members and mounted on an indeendently controlled shaft and a Vernier adustment means connected to both the stator and rotor cup members.

3. In a variable condenser the combination of a series of concentric rotor semi-spherical cup members rigidly secured to a central shaft, a series of concentric stator semis herical cup members rigidly secured to a s otted shaft mounted over said central shaft and insulated therefrom together with connecting terminals on each of said shafts and a variometer encased by said stator and rotor cup members and mounted on an independently controllcd shaft.

4. In a variable condenser the combination of a series of concentric rotor semi-spherical cup members rigidly secured to a central shaft, a series of concentric stator semisplierical cup members rigidly secured to a slotted shaft mounted over said central shaft and insulated therefrom together with connecting terminals on each of said shafts and a variometer encased by said stator and rotor cup members and a Vernier adjustment means connected to both the stator and rotor cup members.

In testimony whereof I afiix my signature.

HARRY MORTIMER- SPECHT.

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