US2747147A - Small capacity tubular adjustable condenser - Google Patents
Small capacity tubular adjustable condenser Download PDFInfo
- Publication number
- US2747147A US2747147A US401809A US40180954A US2747147A US 2747147 A US2747147 A US 2747147A US 401809 A US401809 A US 401809A US 40180954 A US40180954 A US 40180954A US 2747147 A US2747147 A US 2747147A
- Authority
- US
- United States
- Prior art keywords
- bushing
- inner electrode
- electrode
- condenser
- small capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 241000239290 Araneae Species 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 241001023788 Cyttus traversi Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
- H03J1/08—Toothed-gear drive; Worm drive
Definitions
- the present invention relates to a small capacity tubular adjustable condenser, and more particularly to a trimmer condenser for high frequency oscillating electronic circuits.
- Fig. 1 is a vertical substantially mid-sectional view of a preferred embodiment of the invention
- Fig. 2 is a detail in elevation of the inner electrode
- Fig. 3 is a view similar to Fig. 1 of a modified form of the invention.
- a hollow cylinder 1 of suitable dielectric material such as glass or other ceramic material having an exterior metallic sheath 2 extending from one end of the cylinder for a distance somewhat less than half its length.
- the sheath 2 constitutes the outer electrode of the condenser and is formed with a cap 3 having an arm 4 for making electrical connection.
- a hollow metallic mounting bushing 5 is rigidly connected in any suitable manner as indicated at 6 to the other end of the dielectric tube 1, said bushing being exteriorly threaded for the reception of a nut 7 by which the bushing may be rigidly mounted in a panel 8 or the like.
- the bushing 5 is provided with an interior annular shoulder 9 having an outwardly facing concave spherical bearing surface 11.
- a screw shaft 12 is loosely mounted at one end in the bushing 5 and is provided with a head 13 rigidly mounted thereon as by means of a press-fit, and provided with a convex spherical surface 14 mating with the surface 11 of the bushing.
- the bushing is preferably provided with an annular ange 15 which is loosely constricted around a shoulder 16 on the head 13 to form a swivel connection for the shaft 12 in the bushing.
- the screw shaft 12 extends into the dielectric tube 1, and an inner electrode 17 having a sliding fit within the dielectric tube 1 is threaded on the shaft 12 for longi* tudinal adjustment by rotation of the shaft, as by means of a screw driver slot 18 formed in the head 13.
- the inner electrode 17 is counterbored for a major portion of its length as indicated at 19, and the bushing S is provided with a similar counterbore 20.
- a compression spring 21 of electrically conductive material such as Phosphor bronze is received at its ends in the counterbores of the inner electrode and bushing and is assembled under pressure whereby it serves to hold the spherical surfaces 11, 14 of the bushing 5 and head 13 firmly in contact at all times.
- the inner electrode 17 is provided with an axially extending socket 22, and the shoulder 9 of bushing 5 is provided with a similar socket 23.
- the spring 21 has its terminal portions bent axially and seated in said sockets 22, 23 whereby the spring resists rotation of the inner electrode and at the same time makes a rm continuous electrical connection to the bushing 5.
- a chordal slot 24 which extends from its open end as best shown in Fig. 2, thus forming an arm 25 separated from the body of the electrode except at its lower end.
- the arm 25 is sprung outwardly as shown in dotted lines in Fig. 2 whereby, when the electrode is inserted in the tube 1, the arm bears frictionally in the tube and prevents lateral movement or vibration of the electrode and also resists its rotation in the tube.
- the pressure of the spring arm 25 against the interior of the dielectric tube 1 insures a firm sliding fit of the electrode in the tube and further assists in preventing rotation of the inner electrode.
- the spherical shape of the thrust bearing surfaces 11, 14 permits the screw shaft to adjust itself angularly in the bushing 5 to compensate for any slight misalignment of the dielectric tube 1.
- Fig. 3 of the drawing shows an embodiment of the invention in which stabilization of the inner electrode is accomplished by means of the stabilizing spring disclosed in applicants prior application Serial No. 263,540, filed December 27, 1951.
- an elastic spider member 26 is rigidly mounted on a reduced terminal portion 27 of said electrode as by means of a spinning operation as indicated at 28.
- the electrode has a tapered section 29 adjacent the reduced portion 27, and the spider 26 is formed with a plurality of divergent spring arms 30 which embrace said tapered section when compressed by introduction of the electrode into the dielectric tube 1.
- the pressure of the arms 30 against the interior of the dielectric tube has been found in practice to stabilize the electrode against all but destructive shocks.
- a dielectric tube having an 'exterior metallic sheath for a portion ofits length forming the outer electrode, a hollow metallic mounting bushing -iXedly attached to one end of the tube, a screw shaft swivelled in the bushing with freedom for limited universal movement, an inner velectrode threaded on the screw shaft and slidable in the tube into and out of registry with the outer electrode, said bushing and inner electrode having coaxial facing coonterbores, and means including a'm'etallic compression spring loosely surrounding the screw shaft seated in said counterbores and nonrotatably anchored at its ends to the bushing and inner electrode respectively, for exerting axial pressure thereon to compress the universal connection, to resist rotation of the inner electrode, and to form a rm stationary continuous electrical connection between the bushing and inner electrode.
- a trimmer condenser as set forth in claim l in which the swivel connection between the bushing and screw shaft comprises a head on the screw shaft having a convex thrust surface, said bushing having a mating concave thrust surface, the pressure of said spring Servf ing to hold said thrust surfaces in contact.
- a tubular condenser as set forth in claim l in which said bushing and inner electrode are provided with axially extending recesses, ⁇ and said spring is provided with outturned ends seating in the recesses and resisting rotary movement of the inner electrode in the dielectric tube.
- a tubular condenser as set forth in claim 1 including further expansive spring means on said inner electrode bearing frictionally against the inner surface of the dielectric tube to stabilize said 'electrode against vibration.
- a tubular condenser as set forth in claim l in which the inner electrode is in the form of a hollow cylinder having a chordal slot forming an elastic arm which is sprung out to press against the interior of the dielectric tube to resist lateral movement and rotation of the inner electrode in the tube.
Landscapes
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
May 22, 1956 c. L. SHULL 2,747,147
SMALL CAPACITY TUBULAR ADJUSTABLE CONDENSER Filed Jan* 4, 1954 JNVENTOR. 4a/Zw OC. ifi/@4L AT RNEY `VIIIIA WI TNESS l United States `Patent O SMALL CAPACITY TUBULAR ADJUSTABLE CONDENSER Charles L. Shull, Horseheads, N. Y.
Application January 4, 1954, Serial No. 401,809
Claims. (Cl. 317-249) The present invention relates to a small capacity tubular adjustable condenser, and more particularly to a trimmer condenser for high frequency oscillating electronic circuits.
In order to secure accurate and stable adjustment and quiet operation of electronic devices incorporatingA oscillating circuits, it is necessary that the adjusting condensers operate smoothly, without either looseness or jamming; that lost motion or'backlash be prevented, and that continuous firm electrical connections be maintained at all times. Considerable difiiculty has heretofore been encountered in providing an economical form of trimmer condenser which meets these requirements.
It is an object of the present invention to provide a novel trimmer condenser which is adapted for accurate and stable adjustment, while being simple in structure and economical to manufacture.
It is another object to provide such a device which is free from lost motion during reversal of direction of adjustment. i
It is another object to provide such a device in which adjustment of the condenser is accomplished without breaking or disturbing the electrical connections of the movable element, firm electrical contact being maintained at all times.
Further objects and advantages will be apparent from the following description taken in connection with the accompanying drawing, in which:
Fig. 1 is a vertical substantially mid-sectional view of a preferred embodiment of the invention;
Fig. 2 is a detail in elevation of the inner electrode; and
Fig. 3 is a view similar to Fig. 1 of a modified form of the invention.
In Fig. 1 of the drawing there is illustrated a hollow cylinder 1 of suitable dielectric material such as glass or other ceramic material having an exterior metallic sheath 2 extending from one end of the cylinder for a distance somewhat less than half its length. The sheath 2 constitutes the outer electrode of the condenser and is formed with a cap 3 having an arm 4 for making electrical connection.
A hollow metallic mounting bushing 5 is rigidly connected in any suitable manner as indicated at 6 to the other end of the dielectric tube 1, said bushing being exteriorly threaded for the reception of a nut 7 by which the bushing may be rigidly mounted in a panel 8 or the like.
The bushing 5 is provided with an interior annular shoulder 9 having an outwardly facing concave spherical bearing surface 11. A screw shaft 12 is loosely mounted at one end in the bushing 5 and is provided with a head 13 rigidly mounted thereon as by means of a press-fit, and provided with a convex spherical surface 14 mating with the surface 11 of the bushing. The bushing is preferably provided with an annular ange 15 which is loosely constricted around a shoulder 16 on the head 13 to form a swivel connection for the shaft 12 in the bushing. The screw shaft 12 extends into the dielectric tube 1, and an inner electrode 17 having a sliding fit within the dielectric tube 1 is threaded on the shaft 12 for longi* tudinal adjustment by rotation of the shaft, as by means of a screw driver slot 18 formed in the head 13.
The inner electrode 17 is counterbored for a major portion of its length as indicated at 19, and the bushing S is provided with a similar counterbore 20. A compression spring 21 of electrically conductive material such as Phosphor bronze is received at its ends in the counterbores of the inner electrode and bushing and is assembled under pressure whereby it serves to hold the spherical surfaces 11, 14 of the bushing 5 and head 13 firmly in contact at all times.
The inner electrode 17 is provided with an axially extending socket 22, and the shoulder 9 of bushing 5 is provided with a similar socket 23. The spring 21 has its terminal portions bent axially and seated in said sockets 22, 23 whereby the spring resists rotation of the inner electrode and at the same time makes a rm continuous electrical connection to the bushing 5.
In order to stabilize the inner electrode in the dielectric tube and prevent loss of adjustment by reason of vibration or shock, it is provided with a chordal slot 24 which extends from its open end as best shown in Fig. 2, thus forming an arm 25 separated from the body of the electrode except at its lower end. The arm 25 is sprung outwardly as shown in dotted lines in Fig. 2 whereby, when the electrode is inserted in the tube 1, the arm bears frictionally in the tube and prevents lateral movement or vibration of the electrode and also resists its rotation in the tube.
In operation, when the condenser is incorporated in an electrical circuit, one connection is made by means of the connector arm 4, and the other connection by grounding the bushing 5 or in any other suitable manner. Rotation of the head 13 and screw shaft 12 causes longitudinal movement of the inner electrode 17 to bring it more or less into registry with the outer electrode 2 whereby the capacity of the condenser is varied as desired. During this adjustment, and at all other times, the spring 21 performs the three functions of holding the thrust bearing surfaces 11, 14 in firm contact, preventing lost motion between the threads of the screw shaft 12 and inner electrode 17, and resisting rotation of the inner electrode so as to insure its traversal when the screw shaft is rotated. At the same time, the pressure of the spring arm 25 against the interior of the dielectric tube 1 insures a firm sliding fit of the electrode in the tube and further assists in preventing rotation of the inner electrode. The spherical shape of the thrust bearing surfaces 11, 14 permits the screw shaft to adjust itself angularly in the bushing 5 to compensate for any slight misalignment of the dielectric tube 1.
Fig. 3 of the drawing shows an embodiment of the invention in which stabilization of the inner electrode is accomplished by means of the stabilizing spring disclosed in applicants prior application Serial No. 263,540, filed December 27, 1951. As there shown an elastic spider member 26 is rigidly mounted on a reduced terminal portion 27 of said electrode as by means of a spinning operation as indicated at 28. The electrode has a tapered section 29 adjacent the reduced portion 27, and the spider 26 is formed with a plurality of divergent spring arms 30 which embrace said tapered section when compressed by introduction of the electrode into the dielectric tube 1.
The pressure of the arms 30 against the interior of the dielectric tube has been found in practice to stabilize the electrode against all but destructive shocks.
Although structure has been shown and described in detail, it will be understood that changes may be made afnam? in the precise form and arrangement of the parts without departing from the spirit of the invention.
I claim:
1. In a tubular trimmer condenser a dielectric tube having an 'exterior metallic sheath for a portion ofits length forming the outer electrode, a hollow metallic mounting bushing -iXedly attached to one end of the tube, a screw shaft swivelled in the bushing with freedom for limited universal movement, an inner velectrode threaded on the screw shaft and slidable in the tube into and out of registry with the outer electrode, said bushing and inner electrode having coaxial facing coonterbores, and means including a'm'etallic compression spring loosely surrounding the screw shaft seated in said counterbores and nonrotatably anchored at its ends to the bushing and inner electrode respectively, for exerting axial pressure thereon to compress the universal connection, to resist rotation of the inner electrode, and to form a rm stationary continuous electrical connection between the bushing and inner electrode.
2. A trimmer condenser as set forth in claim l in which the swivel connection between the bushing and screw shaft comprises a head on the screw shaft having a convex thrust surface, said bushing having a mating concave thrust surface, the pressure of said spring Servf ing to hold said thrust surfaces in contact.
3. A tubular condenser as set forth in claim l in which said bushing and inner electrode are provided with axially extending recesses, `and said spring is provided with outturned ends seating in the recesses and resisting rotary movement of the inner electrode in the dielectric tube.
4. A tubular condenser as set forth in claim 1 including further expansive spring means on said inner electrode bearing frictionally against the inner surface of the dielectric tube to stabilize said 'electrode against vibration.
5. A tubular condenser as set forth in claim l in which the inner electrode is in the form of a hollow cylinder having a chordal slot forming an elastic arm which is sprung out to press against the interior of the dielectric tube to resist lateral movement and rotation of the inner electrode in the tube.
References Cited in the file of this patent UNITED STATES PATENTS 2,411,810 Sander Nov. 26, 1946 2,607,826 Barnes Aug. 19, -1952 FOREIGN PATENTS 263,948 Great Britain 1an. 10, 1927 496,315 Great Britain e Nov. l29, 19.38 628,499 Germany Apr. 6, 1936
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US401809A US2747147A (en) | 1954-01-04 | 1954-01-04 | Small capacity tubular adjustable condenser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US401809A US2747147A (en) | 1954-01-04 | 1954-01-04 | Small capacity tubular adjustable condenser |
Publications (1)
Publication Number | Publication Date |
---|---|
US2747147A true US2747147A (en) | 1956-05-22 |
Family
ID=23589314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US401809A Expired - Lifetime US2747147A (en) | 1954-01-04 | 1954-01-04 | Small capacity tubular adjustable condenser |
Country Status (1)
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US (1) | US2747147A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3153753A (en) * | 1961-01-25 | 1964-10-20 | Erie Technological Prod Inc | Trimmer condenser |
US3166695A (en) * | 1960-10-12 | 1965-01-19 | Charles T Barnes | Trimmer capacitor |
US3731165A (en) * | 1971-10-04 | 1973-05-01 | Jfd Electronics Corp | Trimmer capacitor with slotted piston |
US4209819A (en) * | 1978-03-13 | 1980-06-24 | Key Tronic Corporation | Capacitive keyswitch |
US4472759A (en) * | 1983-09-09 | 1984-09-18 | Murata Eria North America, Inc. | Air trimmer capacitor |
US4851961A (en) * | 1988-11-14 | 1989-07-25 | Funk Alexander L | Endless reactor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB263948A (en) * | 1925-10-08 | 1927-01-10 | John Ronald Spink | Improvements in variable electric condensers |
DE628499C (en) * | 1934-06-01 | 1936-04-06 | Porzellanfabvrik Kahla | Capacitor of unchangeable capacity, arbitrarily adjustable dielectric temperature coefficient |
GB496315A (en) * | 1937-09-27 | 1938-11-29 | Sidney George Brown | Improvements in or relating to electric condensers |
US2411810A (en) * | 1943-09-20 | 1946-11-26 | Rca Corp | Audio reactor |
US2607826A (en) * | 1950-07-25 | 1952-08-19 | Llewellyn T Barnes | Trimmer capacitor |
-
1954
- 1954-01-04 US US401809A patent/US2747147A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB263948A (en) * | 1925-10-08 | 1927-01-10 | John Ronald Spink | Improvements in variable electric condensers |
DE628499C (en) * | 1934-06-01 | 1936-04-06 | Porzellanfabvrik Kahla | Capacitor of unchangeable capacity, arbitrarily adjustable dielectric temperature coefficient |
GB496315A (en) * | 1937-09-27 | 1938-11-29 | Sidney George Brown | Improvements in or relating to electric condensers |
US2411810A (en) * | 1943-09-20 | 1946-11-26 | Rca Corp | Audio reactor |
US2607826A (en) * | 1950-07-25 | 1952-08-19 | Llewellyn T Barnes | Trimmer capacitor |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3166695A (en) * | 1960-10-12 | 1965-01-19 | Charles T Barnes | Trimmer capacitor |
US3153753A (en) * | 1961-01-25 | 1964-10-20 | Erie Technological Prod Inc | Trimmer condenser |
US3731165A (en) * | 1971-10-04 | 1973-05-01 | Jfd Electronics Corp | Trimmer capacitor with slotted piston |
US4209819A (en) * | 1978-03-13 | 1980-06-24 | Key Tronic Corporation | Capacitive keyswitch |
US4472759A (en) * | 1983-09-09 | 1984-09-18 | Murata Eria North America, Inc. | Air trimmer capacitor |
US4851961A (en) * | 1988-11-14 | 1989-07-25 | Funk Alexander L | Endless reactor |
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