US3976825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead-through for electric cables and the like
Assignee: Individual
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Filing: 1975-06-24
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Granted: 1976-08-24
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Expires: 1995-06-24
Abstract
Abstract The invention comprises a lead-through for electric cables and the like which is fire-proof, gas-proof, and liquid-proof at a predetermined temperature. The cables extend through an opening in a ceiling, floor and/or wall. Guide strips encircle at least one conductor or cable; and filling members, when required, are placed between the sides of the opening and guide strips. The filling members and the strips comprise a material having a relatively high coefficient of cubic expansion. A support member for the strips is arranged to abut a support edge formed in a frame structure. The support member affords a reinforcement against high pressure acting on the lead-through.
Inventors
- 👤 Hans Erik Anderberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:34
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
273 words
A lead-through, for conducting electrical cables and the like through an opening in a wall or ceiling said lead-through being fire-proof, gas-proof, and liquidproof at a predetermined temperature, comprising: a frame structure for bounding an opening in a wall or ceiling; inwardly extending flanges on two opposing sides of the frame structure narrowing the opening of said frame structure; a plurality of guide means within said frame structure forming a plurality of spaces for cables to be passed through said opening, said guide means individually encircling each of one or more cables when said cables extend through said frame structure, said guide means being composed of a material having a relatively high coefficient of cubic expansion, whereby in the event of fire, said guide means will expand and form tight seals around the cables and against each other to prevent transfer of flame and combustion gases through said lead-through; a plurality of filling members extending between the sides of said frame structure and said guide means, said filling members being composed of a material having a relatively high coefficient of cubic expansion, whereby, in the event of fire, said filling members will expand and form tight seals against said guide means, against said frame structure and against each other to prevent transfer of flame and combustion gases through said lead-through; and retaining means for retaining said guide means and said filling members within the confines of said frame structure, said retaining means arranged to abut and rest upon said flanges of said frame structure adjacent a first outer end of said opening, said guide means and said filling members abutting said retaining means.
Claim 2
Dependent Claim
273 words
A lead-through, for conducting electrical cables and the like through an opening in a wall or ceiling said lead-through being fire-proof, gas-proof, and liquidproof at a predetermined temperature, comprising: a frame structure for bounding an opening in a wall or ceiling; inwardly extending flanges on two opposing sides of the frame structure narrowing the opening of said frame structure; a plurality of guide means within said frame structure forming a plurality of spaces for cables to be passed through said opening, said guide means individually encircling each of one or more cables when said cables extend through said frame structure, said guide means being composed of a material having a relatively high coefficient of cubic expansion, whereby in the event of fire, said guide means will expand and form tight seals around the cables and against each other to prevent transfer of flame and combustion gases through said lead-through; a plurality of filling members extending between the sides of said frame structure and said guide means, said filling members being composed of a material having a relatively high coefficient of cubic expansion, whereby, in the event of fire, said filling members will expand and form tight seals against said guide means, against said frame structure and against each other to prevent transfer of flame and combustion gases through said lead-through; and retaining means for retaining said guide means and said filling members within the confines of said frame structure, said retaining means arranged to abut and rest upon said flanges of said frame structure adjacent a first outer end of said opening, said guide means and said filling members abutting said retaining means.
Claim 3
Dependent Claim
69 words
A lead-through as defined in claim 1 further comprising a plurality of rigid plug means of a material having a relatively high coefficient of cubic expansion but low heat conductivity placed in and closing such spaces not occupied by guide means, said plug means, in the event of fire, expanding to form tight seals against each other to prevent transfer of flame, combustion gases, and heat through said lead-through.
Claim 4
Dependent Claim
21 words
A lead-through as defined in claim 2 wherein a bolt extends through a guide means for removing the rigid plug means.
Claim 5
Dependent Claim
39 words
A lead-through as defined in claim 1 further comprising additional retaining means abutting the frame structure adjacent a second outer end of said opening from which said guide means and said filling members are inserted into said frame structure.
Claim 6
Dependent Claim
41 words
A lead-through as defined in claim 1 wherein said framestructure comprises two partially overlapping halves movable in relation to each other in the direction of said overlap to enlarge said frame structure prior to said structure being fixed adjacent the opening.
Claim 7
Dependent Claim
74 words
A lead-through as defined in claim 1 wherein said retaining means comprise a plurality of adjacent bent strips disposed to present to each other a series of opposed V-shaped openings, adjacent strips being spaced apart sufficiently to accommodate said filling members, each of said filling members having a hexagonal cross-section, opposing pairs of sides of said cross-section conforming to the configuration of the portion of said V-shaped openings of said retaining means adjacent thereto.
Claim 8
Dependent Claim
56 words
A lead-through as defined in claim 1 wherein said guide means comprise an electrically insulating material having a high coefficient of cubic expansion, whereby, in the event of fire, said guide means will expand and form tight seals around the cables and against each other to prevent transfer of flame and combustion gases through said lead-through.
Claim 9
Dependent Claim
36 words
A lead-through as defined in claim 1 including cables extending through said guide means wherein one side of the lead-through has a sealing layer to seal said lead-through against the entrance of gas at low temperatures.
Claim 10
Dependent Claim
17 words
A lead-through as defined in claim 8 wherein said sealing layer is comprised of a fire-proof material.
Claim 11
Dependent Claim
59 words
A lead-through as defined in claim 1 mounted in a wall wherein the wall through which cables are to be conducted comprises a bulkhead of a ship; the longitudinal dimension of said lead-through exceeds the thickness of the bulkhead; the frame structure is placed adjacent said bulkhead; and said frame structure is held in sealing engagement with said bulkhead.
Claim 12
Dependent Claim
30 words
A lead-through in combination with a bulkhead as defined in claim 10 wherein said frame structure is comprised of two abutting portions, each of said portions being of U-shaped cross-section.
Claim 13
Dependent Claim
44 words
A lead-through in combination with a bulkhead as defined in claim 10 wherein said frame structure further comprises a first separate frame structure placed on one side of said bulkhead and a second separate frame structure placed on the opposed side of said bulkhead.
Claim 14
Dependent Claim
45 words
A lead-through in combination with a bulkhead as defined in claim 10 wherein the frame structure is held in sealing engagement with the bulkhead by means which comprise a support bar embracing said frame structure, and a plurality of bolts passing through said support bar.
Claim 15
Dependent Claim
22 words
A lead-through in combination with a bulkhead as defined in claim 10 wherein said frame structure is composed of a refractory material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |