US1878631A - Electrical condenser - Google Patents

Description

Sept. 20, 1932. P. E. GILLING 1,878,631

ELECTRICAL CONDENSER Filed May 20, 1929 ill INVENTOR PRESTON E. GILL/N6 A TTOR/VE Y Patented Sept. 20, 1932 UNITED STATES PATENT OFFICE PRESTON E. GILLING, OF HADDON HEIGHTS, NEW JERSEY, ASSIGNOR TO RADIO CONDENSER COMPANY, OF CAMDEN, NEW JERSEY ELECTRICAL CONDENSER Application filed May 20,

rality of groups of stator plates carried on a' common framework, and a plurality of groups of rotor plates carried on a common shaft supported by the frame, so that the respective rotors function with their respective stator plates.

In the construction of such a gang condenser, means have been proposed, in the shape of an adjustable Vernier, for equalizing the capacity factor of each condenser unit so as to get capacity curves from these units which are substantially identical. I have found by experience, that such an arrangement is not the proper one and does not solve the problem encountered in a hook-up of such a gang condenser. Due to the variations in the manufacture of such a gang condenser and also due to the differences in the tuning coils with which the condensers are associated, and the connections between the coils and the condensers in the radio set, the tuning condensers should be so constructed as to give what I term a rubber band curve; that is to say, a. capacity curve which may increase or decrease over certain sectors of the rotor In order to compensate for the discrepancies above pointed out at different parts of the capacity curve. It naturally follows from what has just been said, that the capacity of the different condensers should differ one from the other, at different settings, in order to compensate for the differences above indicated.

It is also essential that each condenser unit be provided with means whereby a certain definite minimum capacity may be attained suitable to meet the requirements of the cir- 1929. Serial No. 364,392.

cuit in which'the condenser unit is used. These minimum capacities may or may not be equal, depending on the different variables entering into the construction of a radio receiving set. i

It is therefore the principal object of my invention to provide a condenserand when I say a condenser, I mean an individual unit of a gang condenserin which means areprovided for adjusting the minimum capacity to a desired amount, and also. the provision of a condenser in which the capacity curve of the condenser may be automatically and continuously varied at diflerent capacity positions of the movable system.

Another object of my invention is to provide a simple and inexpensive construction for obtaining the principal objects of my invention.

These and other objects will be apparent to one skilled in this art after a study of the specification taken in connection with the annexed drawing, wherein:

Figure 1 illustrates on a reduced scale, a

four-gang condenser of the type and general construction shown in Cramer application S. N. 361,943, filed May 10, 1929. Figure 2 is a View on the line 22 of Figure 1, but with the rotors turned to the out position; that is to say, to the position where the minimum capacity is obtained.

Figure 3 is a view of a modified form of rotorplate suitable for use in place of the rotor plate shownin Figure 2.

Figure 4 is a View of a still further modilied form of rotor plate.

Figure 5 is a partial view of an individual form of curve correcting plate.

F igure6 is a plan view showing the method of mounting the curve correcting plate of Figure 5.

, In the drawing wherein like figures refer to corresponding parts in the various views, 1 is a framework having end support plates 2 and 3, and braces-11. The shaft 4 is carried on the end support plates 2 and 3 on anti-friction bearings 5 and 6. The stator groups of plates 7, only the outer two of which are shown in Figure 1, are mounted on the frame 1 by means of insulators 12 and 13, the opposite ends of the stator plates being fastened together by tie bars 14. As shown in Figure 2, the insulators 12 and 13 extend through openings 15 in the side walls of the frame 1 and are held to the frame 1 in any satisfactory manner as by screws 16,

and to the tie bars 14 in any satisfactory mannor as by screws 17.

The rotor groups of plates 8, of which only the outer two of each condenser are illustrated in Figure 1, are carried on a sleeve 9 fastened to the shaft l in any satisfactory manner as screws 10. It will be readily understood that on turning the shaft 4, all of the groups of rotor plates carried by the shaft 4, are operated simultaneously to function with their respective stators.

My improvements, which are directed to means for obtaining compensation'and minimum capacity, are illustrated in Figure 2, wherein at least one of the outer rot-or plates 8 is provided with a projection 18 which may be of any desired shape, but which preferably extends into overlapping relationship with the adjacent stator plate 7. The projection 18 may be bent toward or away from the stator plate 7, but I prefer to provide a portion which is severed along the line 19, except for a small space 20 near the outer pe riphery 21 of the plate 8, thereby allowing the portion 20 to be plucked or bent outwardly or inwardly, away or toward the stator plate 7. This construction allows a very simple and inexpensive and positive way of obtaining a certain fixed minimum capacity, and the minimum capacity of the various condenser units may be adjusted to suit conditions.

In order to get an automatic and continuously varying capacity of the condenser, other portions 22 are similarly arranged in the plate 8, whereby these portions may be shifted to increase or decrease the capacity a small amount when these sectors are brought into cooperative capacity relationship with the stator. By adopting the construction shown, I have left the outer .rim or edge of the stator plate 8 continuous, whereby greater rigidity is obtained than in the constructions that have been proposed, whereby the outer stator plate is slitted from its periphery toward the center. I have found that this retaining rim is highly essential to getting more accurate results, and a much more satisfactory condenser is obtained by this arrangement.

In passing, it may be mentioned that either one or both of the outer plates 8 of each rotor group may be constructed as shown in Figure 2, it being understood that all of the rotor plates are held together at least on one side by a tie bar such as 23. It is also to be understood that the outer rotor plates of each condenser, which are specially constructed, may be of somewhatlarger area than the Other rotor plates, in order that the adjustable portions 22 may be made somewhat larger than is illustrated, the only requirement being that these plates will not touch the frame 1 as the rotor shaft is turned.

The stator plates 7 which are adjacent the outer rotor plates of each condenser, may if desired, have an extension 24 shown in dotted lines in Figure 2, which functions with the projection 18 when the rotor is turned into full operative position, thereby obtaining a little more capacity from the condensers.

In the form of rotor plate shown in F igure 3, the portions 25 are formed in a somewhat similar manner as the portions 22 shown in Figure 2, but instead of being positioned radially, they are positioned arcuately, the portions being severed from the main body of the plates 8 along the line 19, leaving the uncutportion 20 supporting the portions 25.

In Figure 4, the rotor plate 8, is provided with a double set of shiftable portions 22 and.

26, the latter being arranged within the periphery of the former.

In Figures 5 and 6, I have shown a separate curve-correcting rotor plate which is adapted to be mounted as an independent member on the shaft 4 or sleeve 9 which carries the standard group of rotor plates. In the form shown, the plates 27 is attached to a collar or clamp member 28 which with the clamp 29 and screws 30, serve to clamp the plate 27 on to one end of the rotor sleeve 9 adjacent the rotor plates 8. The size of the clamps 28 and 29 may be varied whereby the curve-correcting plate 27 may be applied to the shaft or to the sleeve and to condensers already in, use. The clamp construction shown, makes it easy to present the plate 27, within limits, at any desired angle and at a. desired space from the rotor plates in order to obtain the best results.

It is thus seen that my improvements are susceptible of being applied in different forms, and while I have chosen to show my invention in connection with a gang condenser for which construction it is especially suited, it may be used with a single individual condenser and certain of the claims are intended to cover both arrangements. 7

Having thus described my invention, what I claim is: w

1. In a gang condenser including; a frame supporting a plurality of groups of stator plates and a shaft carrying a plurality of groups of'rotor plates; means for providing a desired minimum capacity for reach individual condenser, and means comprising a plate having a continuous unsevered periphery and adjustable partially-severed portions for automatically obtaining a different capacity from each of said condenres for any given arcuate position of the rotor shaft.

2. In a gang condenser including; a frame supporting a plurality of groups of stator plates and a shaft carrying a plurality of groups of rotor plates; means for providing 'position of the rotor shaft, said first mentioned means consisting of a projection on the starting end of at least one of the outer rotor plates extending toward its associated stator group, said second mentioned means consistmg of portions severed, except for a small {space adjacent the periphery of the plate,

from at least one of the outer rotor plates.

3. In a gang condenser including; a frame supporting a plurality of groups of stator plates and a shaft carrying a plurality of groups of rotor plates; means for providing a desired minimum capacity for each individual condenser, and means for automatically obtaining a different capacity from each of said condensers for any given arcuate position of the rotor shaft, said first mentioned means consisting of a projection on the starting end of at least one of the outer rotor plates extending toward its associated stator group, said projection having a portion severed so it may be readily displaced from the plane of the projection, said second mentioned means consisting of portions severed, except for a small space adjacent the periphery of the plate, from at least one of the outer rotor-plates.

4. In an electrical condenser including stator and rotor elements capable of producing a certain capacity curve, a plate capacitatively associated with one of the condenser elements and having portionssevered from the plate, except for a small space,so as to leave integral parts of the plate between said portions, said portions being adjustable for altering said curve automaticall and continuously as the rotor is "operate 5. In an electrical condenser including stator and rotor elements capable of producing a certain capacity curve, at least one of the outer rotor plates having portions severed from the plate, except for a small space, so as to leave integral parts of the plate between said portions, said portions being adjustable for altering said curve automatically and continuously as the rotor is operated.

6. In a variable condenser including plates relatively movable into difi'erent overlapping relationship to change the capacity of the condenser, one of said plates having portions which may be bent in a direction to change the capacity of the condenser without changing the amount of overlap between the plates, said portions being spaced-from each other by integral parts of the plate and also being spaced from the peripheral edge of the plate.

7 A variable condenser including a fixed section made up of spaced plates and a movable section made up of spaced plates adapted to be interleaved with the plates of the fixed section to vary the capacity of the condenser, and means comprising a plurality of adjustable portions of at least one of the outer plates of one of said sections for automatically and continuously effecting variations in the capacity of the condenser, said portions being spaced from each other by integral parts of the plate and also being spaced from the peripheral edge of the plate.

8. In a variable condenser including plates relatively movable int-o different overlapping relationship to change the capacity of the condenser, one of said plates having a projection extending toward a plate of opposite kind, whereby a desired minimum capacity is obtained when the sets of plates are in nonoverlapping position, and also having portions which may be bent in a direction to change the capacity of the condenser without changing the amount of overlap between the plates, said portions being spaced from each other by integral parts of the plate and also being spaced from the peripheral edge of the plate.

9. In a gang condenser including separate groups of plates, each group having plates relatively movable into diiterent overlapping relationship to change the capacity of the condenser, at least one of the plates of eachgroup having a projection extending toward a cooperating plate of opposite polarity, whereby a desired minimum capacity is obtained when the groups of plates are in non-overlapping position, and also having portions which may be bent in a direction to i change the capacity of the condenser without changing the amount of overlap between plates, said portions being spaced from each other by integral parts of the plate and also being spaced from the peripheral edge of the late. p 10. A variable condenser including a fixed section made up of spaced plates and a movable section made up of spaced plates adapted to be interleaved with the plates of the fixed section to vary the capacity of the condenser, and means comprising a plurality of adjustable portions of at least one of the outer plates of one of said sections for automatically and continuously effecting variations in the capacity of the condenser, said portions being spaced from each other by integral arts of the plate and also being spaced rom the peripheral edge of the plate, and further means comprising a projection on the leading end of at least one of the plates adjustable portions of at least one of the outer plates of one of said sections for auto: matically and continuously effecting variations in the capacity of the condenser, said portions being spaced from each other by' integral parts of the plate and also being spaced from the peripheral edge of the plate, and further means comprisinga projection onthe leading end of at least one of the plates of the movable section for obtaining a desired minimum capacity, and still further means, comprising a projection on at least one of the plates of the fixed section, for utilizing the projection on the'plate of the movable section in cooperation to add to the capacity of the condenser at maximum capacity setting thereof.

12. For an electrical condenser including cooperative fixed and movable elementscapable of producing a certain capacity curve, a curve correcting plate independently constructed similar to one of said elements and having separate mounting means for attaching the plate to a part of the movable elements to move therewith, said plate having portions spaced from each other by integral parts of the plate and also being spaced from the peripheral edge of the plate which may be adjusted for automatically and continuously efi'ecting variations in the capacity of the condenser.

13. For an electrical condenser including cooperative fixed and movable elements capable of producing a certain capacity curve, a curve correcting plate independently constructed similar to one of said elements and less than 360 in arcuate length and having mounting means for quickly attaching the plate to a part of the movable element at a desired arcuate angle and at a desired laterally spaced distance within limits.

In testimony whereof, I afiix my signature.

PRESTON E. GILLING.

Images