US3760323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated wire wound resistor
Assignee: Continental Wirt Electronics Corp
•
Filing: 1972-09-25
•
Granted: 1973-09-18
•
Expires: 1992-09-25
Abstract
Abstract A variable resistor which includes a one-piece molded plastic insulating housing having an open-ended hollow socket in which is disposed an assembly consisting of a wire wound annularly-shaped resistance element having terminal legs projecting directly through and outwardly of the insulating housing, and a pair of electrically interengaged metal rings mounted on a molded plastic rotor coaxially centered within said hollow socket, one of said rings having a contact finger engaging the resistance element and the other of said rings having a terminal lug extending through and outwardly of the molded plastic housing, all of the foregoing assembly parts being operatively held within the one-piece housing by a molded plastic insulator ring fitted in the open end of said hollow socket, and a retainer shell locked to and embracing said socket and its end closure ring to secure the entire assembly together. A detent projection from the retainer shell extends into the housing and in conjunction with an extension on the molded plastic rotor provides rotation stops for the rotor contact finger. The entire housing is secured to a mounting plate by means of a pair of locking arms having hooked ends which are integral with and project forward from the housing and are designed to pass through mounting slots in the mounting board and grip the edges of the mounting slots to thereby firmly press the broad area front face of the one-piece housing against the rear surface of the mounting plate.
Inventors
- 👤 B Lifson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:36
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/30; H01C10/301
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
330 words
A variable resistor comprising in combination, a. an open-ended one-piece molded plastic insulating unit having at one end thereof an axially apertured solid section and at its opposite end a co-axial cylindrical thin-walled section of an inside diameter substantially greater than that of the aperture through said solid section, b. a molded plastic insulating annular end member non-rotatably fitted upon the open-end of said thin-walled section of said one-piece unit to provide conjointly therewith a completely insulated housing with an internal cavity having axially spaced front and rear annular abutments therein, c. a wire-wound resistance element in the form of a split annulus disposed and held captive in said cavity between the axially spaced abutments thereof, said resistance element having a pair of terminal legs respectively projecting outwardly of said cavity through spaced openings formed in said insulating unit, d. a shouldered plastic cylindrical rotor member having a reduced end portion journalled in said apertured solid section of said insulating unit and an opposite end portion projecting freely through said insulating annular end member, e. a metal contact-finger ring having a contact finger extending laterally therefrom for sliding contact with said resistance element, f. a metal terminal ring having a terminal leg projecting outwardly of said cavity through an opening formed in said insulating unit between and in spaced relation to said openings for the terminal legs of said resistance element, 1. said metal contact-finger ring and said metal terminal ring being disposed in overlying, electrically engaged relation between the shoulder of said rotor member and the front abutment of said insulated cavity, and g. a rear retainer shell of generally cup-shaped form having a base wall overlying said insulating annular end member and a cylindrical wall closely embracing the thin-walled section of said unit, said shell being non-rotatably locked to the housing to thereby secure in fixed assembly said insulating unit and its end member as a complete insulating enclosure for said resistance element and its operatively associated parts.
Claim 2
Dependent Claim
330 words
A variable resistor comprising in combination, a. an open-ended one-piece molded plastic insulating unit having at one end thereof an axially apertured solid section and at its opposite end a co-axial cylindrical thin-walled section of an inside diameter substantially greater than that of the aperture through said solid section, b. a molded plastic insulating annular end member non-rotatably fitted upon the open-end of said thin-walled section of said one-piece unit to provide conjointly therewith a completely insulated housing with an internal cavity having axially spaced front and rear annular abutments therein, c. a wire-wound resistance element in the form of a split annulus disposed and held captive in said cavity between the axially spaced abutments thereof, said resistance element having a pair of terminal legs respectively projecting outwardly of said cavity through spaced openings formed in said insulating unit, d. a shouldered plastic cylindrical rotor member having a reduced end portion journalled in said apertured solid section of said insulating unit and an opposite end portion projecting freely through said insulating annular end member, e. a metal contact-finger ring having a contact finger extending laterally therefrom for sliding contact with said resistance element, f. a metal terminal ring having a terminal leg projecting outwardly of said cavity through an opening formed in said insulating unit between and in spaced relation to said openings for the terminal legs of said resistance element, 1. said metal contact-finger ring and said metal terminal ring being disposed in overlying, electrically engaged relation between the shoulder of said rotor member and the front abutment of said insulated cavity, and g. a rear retainer shell of generally cup-shaped form having a base wall overlying said insulating annular end member and a cylindrical wall closely embracing the thin-walled section of said unit, said shell being non-rotatably locked to the housing to thereby secure in fixed assembly said insulating unit and its end member as a complete insulating enclosure for said resistance element and its operatively associated parts.
Claim 3
Dependent Claim
59 words
A variable resistor as defined in claim 1 wherein said open-ended one-piece insulating unit is provided with a pair of diametrically opposed, integral mounting arms, which said arms project frontally beyond the front end of the solid section of said unit and are respectively provided with hooked extremities projectible through apertures formed in a mounting panel for the resistor.
Claim 4
Dependent Claim
49 words
A variable resistor as defined in claim 2 wherein said front end of said solid section of said unit is provided with a flat, front face of substantial area adapted for flat-wise engagement against the surface of the mounting panel when said mounting arms are hooked into the panel.
Claim 5
Dependent Claim
70 words
A variable resistor as defined in claim 3 wherein said mounting arms are generally of L-shaped form to provide each with a leg part which extends substantially parallel to the central axis of the resistor housing in outward radially spaced relation to said insulating housing and with a laterally extending base part integrally united to said unit at points spaced rearwardly from said flat, front face of said solid section.
Claim 6
Dependent Claim
75 words
A resistor as defined in claim 3 wherein said rear retainer shell is formed of metal and is provided with circumferentially spaced locking tabs and wherein said insulating unit is provided with correspondingly spaced seats into which said tabs are respectively clinched, said seats being spaced rearwardly from said flat, front face of said insulating unit to thereby insure against contact of said clinched locking tabs with the panel upon which the resistor is mounted.
Claim 7
Dependent Claim
33 words
A resistor as defined in claim 1 wherein said base wall of said rear retainer shell is centrally apertured to provide a bearing seat for the rear end of said insulating rotor member.
Claim 8
Dependent Claim
40 words
A resistor as defined in claim 6 wherein said apertured base wall of the rear retainer shell and said rotor member are respectively provided with coacting means for limiting rotation of said rotor in either direction to a predetermined arc.
Claim 9
Dependent Claim
25 words
A resistor as defined in claim 1 wherein said contact-finger ring is keyed to said rotor member for rotation therewith relatively to said resistance element.
Claim 10
Dependent Claim
47 words
A resistor as defined in claim 1 wherein said thin-walled section of said insulating unit is provided with an internally projecting part disposed between the split ends of the resistor element to maintain the same expanded in annular form against the inner wall surface of said housing.
References Cited (Backward Citations)
US3366911A
Cited
US3298641A
Cited
US3389364A
Cited
US3500282A
Cited
US3486157A
Cited
US3579169A
Cited
US3670285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |