US3875461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static eliminator
Assignee: Harris Graphics Corp
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Filing: 1973-09-18
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Granted: 1975-04-01
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Expires: 1993-09-18
Abstract
Abstract A static eliminator serves to neutralize accumulated electric static charge on a web or sheet material. The static eliminator includes a metal housing having an elongated opening exposing a plurality of corona discharge needles which are longitudinally spaced and mounted to a strip member located within the housing. The strip member is constructed of insulating material, such as plastic, and carries an elongated cable which extends longitudinally within the housing. The cable is the type having a central conductive core surrounded by a layer of dielectric material. The cable is mounted in a groove in the strip member with the groove having spaced apart conductive layers thereon. The corona needles are mounted in the strip at longitudinally spaced locations corresponding with the conductive layers. Each needle is mounted so that it makes electrical contact at one end with an associated conductive layer and extends therefrom so that its opposite end, which is tapered to a point, is exposed in the area of the longitudinal opening in the housing. The cable is terminated within the housing with the terminated end being fitted with a metal corona ball. The ball carries a radially extending electrically conductive projection which, in assembly, is inserted into the exposed end of the cable so as to make electrical and mechanical engagement with the inner electrical core to reduce corona discharge therefrom.
Inventors
- 👤 Robert Harold Richardson
- 👤 William Merdoc Smith
- 👤 Robert Carlton Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:07
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
242 words
A static eliminAtor comprising: an elongated hollow metal housing having inwardly facing walls, and a longitudinally extending opening therein to define a longitiudinally extending channel in said housing, an elongated nonconductive strip member mounted in said housing within said channel and extending longitudinally therein, a cable having an inner conductive core surrounded by a dielectric layer extending longitudinally of said housing and mounted to said strip member, said strip member having a longitudinally extending groove for receiving said cable therein, a plurality of longitudinally spaced apart conductive layers secured to said groove prior to assembly of said cable in said groove in said strip member, a plurality of needlelike electrically conductive projections each having one end in an electrical engagement with a said conductive layer and extending therefrom through said strip member with said plurality of projections being oriented at longitudinally spaced locations corresponding with said plurality of conductive layers, each said projection having a portion of its length at its opposite end being configured to form a pointed end extending beyond said strip member in the direction toward the opening in said housing said strip member has a mounting portion and a body portion, said mounting portion being secured to said housing and said body portion having outwardly facing walls spaced inwardly from the inwardly facing walls of said housing to define an air pocket therebetween so as to thereby minimize the dielectric constant between said core and said metal housing.
Claim 2
Dependent Claim
242 words
A static eliminAtor comprising: an elongated hollow metal housing having inwardly facing walls, and a longitudinally extending opening therein to define a longitiudinally extending channel in said housing, an elongated nonconductive strip member mounted in said housing within said channel and extending longitudinally therein, a cable having an inner conductive core surrounded by a dielectric layer extending longitudinally of said housing and mounted to said strip member, said strip member having a longitudinally extending groove for receiving said cable therein, a plurality of longitudinally spaced apart conductive layers secured to said groove prior to assembly of said cable in said groove in said strip member, a plurality of needlelike electrically conductive projections each having one end in an electrical engagement with a said conductive layer and extending therefrom through said strip member with said plurality of projections being oriented at longitudinally spaced locations corresponding with said plurality of conductive layers, each said projection having a portion of its length at its opposite end being configured to form a pointed end extending beyond said strip member in the direction toward the opening in said housing said strip member has a mounting portion and a body portion, said mounting portion being secured to said housing and said body portion having outwardly facing walls spaced inwardly from the inwardly facing walls of said housing to define an air pocket therebetween so as to thereby minimize the dielectric constant between said core and said metal housing.
Claim 3
Dependent Claim
31 words
A static eliminator as set forth in claim 1 wherein said longitudinally spaced apart pointed ends extend to a location which is not beyond the longitudinal opening defined in said housing.
Claim 4
Dependent Claim
71 words
A static eliminator as set forth in claim 1 wherein said housing has oppositely facing open end walls and said elongated nonconductive strip member located within said housing has its opposite ends spaced inwardly from the opposite open ends of said housing, and electrically nonconductive means disposed within said channel at said opposite ends to fill the space between said open ends and the correspondingly associated ends of said strip member.
Claim 5
Dependent Claim
68 words
A static eliminator as set forth in claim 1 wherein said inwardly facing walls extend longitudinally of said housing with the facing side walls thereof having longitudinally extending grooves defined therein, said longitudinally extending strip member having oppositely directed longitudinally extending mounting means at said mounting portion and being configured so as to be received in said longitudinally extending grooves to mount said strip member to said housing.
Claim 6
Dependent Claim
45 words
A static eliminator as set forth in claim 4 wherein said oppositely directed and longitudinally extending mounting means are each defined by a plurality of longitudinally spaced mounting ears adapted to be slidably received in said grooves in said facing side walls of said housing.
Claim 7
Dependent Claim
30 words
A static eliminator as set forth in claim 1 wherein said spaced apart conductive layers in said groove are each defined by an electrically conductive coating applied to said groove.
Claim 8
Dependent Claim
28 words
A static eliminator as set forth in claim 6, wherein each said coating is painted onto the walls of said groove with a film of electrically conductive paint.
Claim 9
Dependent Claim
42 words
A static eliminator as set forth in claim 1 wherein said cable has one end thereof terminated within said housing, an electrically conductive spherical member mounted onto said terminated end so as to abut said terminated end to minimize corona discharge therefrom.
Claim 10
Dependent Claim
51 words
A static eliminator as set forth in claim 8 including an electrically conductive projection member extending from said spherical member and extending into a portion of the length of said cable at its terminated end with said projection member being in electrical contact with said inner conductive core in said cable.
Claim 11
Dependent Claim
200 words
A static eliminator comprising: an elongated cable having an inner conductive core surrounded by a dielectric layer, said core adapted to be connected to a high voltage source, an array of longitudinally spaced electrically conductive needles each having a sharp projection at one end facing in a direction away from said cable, a like plurality of conductive layers longitudinally aligned and electrically spaced from each other, each said layer being in electrical contact with an associated one of said needles at a point interposed between the projecting end of the associated needle and said elongated cable, each said conductive layer being electrically spaced from said conductive core by said dielectric layer so as to define electrical capacitance between said needle and said core, said cable having a terminated end, an electrically conductive spherical member, an electrically conductive projection extending from said spherical member, said spherical member being mounted so as to abut the terminated end of said cable with said projection extending into said cable for a portion of its length adjacent said terminated end with said projection making electrical contact with said conductive core whereby said spherical member minimizes corona discharge from the terminated end of said electrical core.
Claim 12
Dependent Claim
200 words
A static eliminator comprising: an elongated cable having an inner conductive core surrounded by a dielectric layer, said core adapted to be connected to a high voltage source, an array of longitudinally spaced electrically conductive needles each having a sharp projection at one end facing in a direction away from said cable, a like plurality of conductive layers longitudinally aligned and electrically spaced from each other, each said layer being in electrical contact with an associated one of said needles at a point interposed between the projecting end of the associated needle and said elongated cable, each said conductive layer being electrically spaced from said conductive core by said dielectric layer so as to define electrical capacitance between said needle and said core, said cable having a terminated end, an electrically conductive spherical member, an electrically conductive projection extending from said spherical member, said spherical member being mounted so as to abut the terminated end of said cable with said projection extending into said cable for a portion of its length adjacent said terminated end with said projection making electrical contact with said conductive core whereby said spherical member minimizes corona discharge from the terminated end of said electrical core.
Claim 13
Dependent Claim
40 words
A static eliminator as set forth in claim 10, including a nonconductive strip member for mounting said cable, said conductive layers and said needles, said conductive layers being defined by longitudinally spaced apart conductive coatings applied to said strip member.
Claim 14
Dependent Claim
22 words
A static eliminator as set forth in claim 10, wherein said strip member has walls defining a longitudinally extending cable receiving groove.
Claim 15
Dependent Claim
30 words
A static eliminator as set forth in claim 12, wherein said conductive layers are defined by longitudinally spaced apart conductive coatings applied to the walls defining said cable receiving groove.
Claim 16
Dependent Claim
33 words
A static eliminator as set forth in claim 13, wherein each said conductive coating is defined by application of a thin layer of conductive paint to the walls defining said cable receiving groove.
References Cited (Backward Citations)
US3443155A
Cited
US3697806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |