US1596875A

US1596875A - Variable condenser

Info

Publication number: US1596875A
Application number: US692733A
Authority: US
Inventors: Lloyd A Hammarlund
Original assignee: HAMMARLUND Manufacturing CO Inc
Current assignee: HAMMARLUND Manufacturing CO Inc
Priority date: 1924-02-14
Filing date: 1924-02-14
Publication date: 1926-08-24
Anticipated expiration: 1943-08-24

Description

Aug. 24 1926.

L. A. HAMMARLUND VARIABLE CONDENSER 7 Filed Fb. 14: 1924 2 Sheets-Sheet 1 INVENTOR ATTORNEYS Aug. 24,1926. F 1,596,875

L. A. HAMMARLUND VARIABLE connsusnn Filed Feb. 14. 1924 2 sheets shget 2 Patented Aug. 24, 1926.

UNITED STATES 1,596,875 PATENT OFFICE.

LLOYD a HAMMARLUND, or NEw YORK, N. Y., assreNon T HAMMANLUND MFG. COMPANY, INc.,or NEW YORK, N. Y., A CORPORATION or NEw YORK.

VARIABLE CONDENSER.

Application filed February 14, 1924. Serial No. 692,733. I

My invention comprises certain improvements applicable to electric current controlling instruments generall and certain improvements more particu arly applicable to the variable condenser which forms the subject matter of my copending ap lication filed November 28th, 1922, Serial 70. 603 793; in which a primary means is employed to bring the condenser into approximate adjustment" and a secondary means working through the primary means, is employed to bring the condenser into a more accurate adjustment.

'A practical embodiment of my invention is represented in the accompanying drawings, in which- I I ig. 1 represents the condenser in top P 311? 2 represents the condenser in side elevation.

Fig, 3 represents a section taken in the plane of the line III-III of Fig. 1, looking 1n the direction of the arrows. I

Fig. 4 represents a back view of the conden r.

Fig. 5 represents a section taken in the plane of the line VV of Fig. 1, looking in the direction of the arrows. I

Fig. 6 represents a detail section on an enlar ed scale, taken in the plane of the line VI of Fig. 5, looking in the direction of the arrows.

The spaced stationary and movable condenser plates are denoted by 1 and 2 respectively. The stationary condenser plates have a two post support as follows: I

The front and

back frame plates

3 and 4 have side recesses 5, 6 and 7, 8. Insulating bars 9, 10 span the side recesses 5, 6 and are permanently secured to the front frame plate 3 as, for instance, by rivets 11. Insulating

bars

12, 13 span the side recesses 7, 8, and are permanently secured to the back frame plate 4 as, for instance, by rivets 14. The stationary condenser plate carrying posts are denoted by 15, 16, which plates are secured at their ends by screws 15* 16* to their respective insulating bars 9, l2 and 10, 13, at points opposite the side recesses in the front and back frame plates. These posts are kerfed at regular intervals and the edges of the stationary condenser plates are inserted into said kerfs and soldered, thereby roducing an accurate and rigid spacing o the plates and eliminating the necessity of using spacing washers on the posts. This two post support for the stationary plates also materially simplifies the construction of the condenser.

' The movable condenser plate carrying rock shaft comprises the enlarged intermediate portion 17 and the reduced

end portions

18, 19, the ends of the enlarged intermediate portion 17 being provided with

conical portions

20, 21. Hollow bearings 22, 23 surround the reduced

portions

18 and 19 of the rock shaft and are screw-threaded into their respective front and

back frame plates

3 and 4. These bearings have conical seats 24, for the conical ends of the enlarged intermediate portion 17 of the rock shaft. The enlarged intermediate portion 17 of the rock shaft is kerfed at regular intervals and the inner edges of the movable plates are forced into said kerfs and S0].- dered, thereby producing an accurate and rigid spacing of the plates.

Means are provided for exerting more or less frictional resistance to the turningof the rock shaft and for adjusting the rock shaft longitudinally, which means in the present instance comprises

spanners

26, 27 engaging the bearings 22, 23, to screw them inwardly or outwardly in their respective front and

backframe plates

3 and 4, said spanners being provided with elongated concentric grooves 28, 29, through which clamp screws 30, 31 pass into the front and back frame plate respectively for locking the spanners and thereby the bearings in their adjusted position.

cans are provided for maintaining a good electrical connection between the rock shaftand one of its bearings, which means in the present instance comprises a spring element carried by the rock shaft having a self-cleaning wiping contact with the bore of one of said bearings. This spring element is shown as comprising a body portion 32, having

spring arms

33, 34 provided with

wings

35, 36 at their ends, the body portion 32 being soldered or otherwise secured to. the reduced end 19 of the rock shaft with its

wings

35, 36 arrangedto wipe the bore of the bearing 23.

. The reduced end 18 of the movable condenser plate carrying rock shaft projects forwardly through the panel 37 where it is provided with the usual dial 38 and knob 39, acting as the primary means for bringing the condenser into approximate adjustment.

The condenser frame is supported by and spaced from the panel 37, in the present instance by providing the front frame plate 3 with studs i0 engaged by the screws il.

The secondary means for bringing the condenser into a more accurate adjustment is constructed, arranged and operated as follows:

The radially disposed arm -12. is located between the front. frame plate 3 and the panel, the inner end of which arm is provided with a clamp a?) frictionally embracing the reduced end 18 of the rock shaft, the branches -l-t and T5 of which clamp are engaged by a screw to to draw the clamp into the required frictional engagement with the rock shaft.

The outer end of this arm -12 is provided with a yoke, the branches -17, d8 of which engage the opposite sides of an eccentric cam t), fixed to a second rock shaft 50, which rock shaftis provided with a socket 51 projecting through the panel 37 in position to removably receive the shank of a handle 52, as desired. The handle may be moved in either direction to move the cam to swing the arm 42 for turning the movable condenser plate rock shaft.

The cam 49 is made radially adjustable so as to accommodate the same to different diameters of dials, the means for radially ad justing the cam being, in thepresent instance constructed as follows:

The bearing 5% for the cam shaft 50 is clamped in any desired position along the radial groove 55, in the bottom of the front frame plate 3, by providing the bearing of one side with a collar and the other side with a nut and washer 57. It will be understood that the hole 58, through the panel 37, through which the cam shaft extends is also suitably elongated to permit this radial adjustment of the cam. lVhen it is desired to adjust the condenser, the knob 39 is turned, as is usual, to bring the condenser into approximate adjustment; it being understood that the rock shaft turns in the clamp of the arm e2. After this approximate adjustment has been obtained, an extremely accurate adjustment of the condenser may be obtained by manipulating the cam operating handle to move the cam and rock the arm, and thereby the movable condenser plate rock shaft either way, to bring the adjustment slightly up or down, as the case may require.

From the above description it will be seen that I have produced an instrument in which the stationary condenser plates and also the radial condenser plates are accurately and rigidly spaced apart novel means being provided for adjusting the bearings to obtain the proper rotative frictional resistance for the rock shaft and fo' adjusting the shaft longitudinally to accurately space the movable condenser plates from the stationary condenser plates.

Also novel means are provided for maintaining a good electric connection between the rock shaft and one of its bearings by the self-cleaning wiping device. Also means are providedfor radially adjusting the cam so as to properly position its operating handle with respect to dials-0f different diameters.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention; hence, I do not wish to be limited to the particular embodiment herein shown and described, but- Yfhat 1 claim is 1. In a variable condenser, spaced stationary and movable plates, means including the movable plate carrying rock shaft for bringing the condenser into adjustment, and separate adjusting devices engaging the shaft upon opposite sides of the plates for adjusting the frictional turning resistance of the rock shaft and the rock shaft longitudinally to bring the movable plates into proper spaced relationship to the stationary plates.

1n variable condenser, spaced stationary and movable plates, means including the movable plate carrying rock shaft for bringing the condenser into adjustment, bearings for said rock shaft upon opposite sides of the plates, and'means for independently ading the hearings to bring the movable plates into proper spaced relationship to the stationary plates and to adjust the frictional resistance of said shaft.

3. In a variable condenser, spaced station ary and movable plates, means including the movable plate carrying rock shaft for bringing the condenser into adjustment, front and rear frame plates, shaft bearings screwthreaded therein, and rotatable spanners engaging said bearings for turning them to adjust the frictional turning resistance of the rock shaft and the position of the rock shaft longitudinally, to bring the movable plates into proper spaced relationship to the stationary plates.

a In a variable condens r, spaced stationary and movable plates, means including the movable plate carrying rock shaft for bringin ac condenser into adjustment, front and rear frame plates. shaft bearings screW- threaded therein, rotatable spanners engaging said bearings for turning them to adjust the frictional turning resistance of the rock shaft and the position of the rock shaft longitudinally, to bring the movable plates into proper spaced relationship to the stationary plates. and means for locking the spanners in their adjusted position.

5. In a va i: ble condenser, spaced station ary and movable plates, and means including the movable plate carrying rock shaft for bringing the condenser into adjustment, said rock shaft having an enlarged intermediate portion provided with conical ends, bearings surrounding the shaft and having conical seats for receiving said conical'ends, and a device carried by the rock shaft having a self-cleaning wiping contact with the bore of one of said hearings to maintain a good electrical connection between the shaft and bearing.

6. In a "ariable condenser, spaced stationary and movable plates, and means including the movable plate carrying rock shaft for brin ing the condenser into adjustment, said rocer shaft having an enlarged intermediate portion provided with conical ends, bearings surrounding the shaft and having conical seats for receiving said conical ends, and a spring element carried b the rock shaft having a self-cleaning wiping contact with the bore of one of said hearings to maintain a good electrical connection between the shaft and bearin In testimony, that I claim the foregoing as m invention, I have signed my name this 8th day of February, 1924.

LLOYD A. HAMMARLUN D.