Intumescent cover for a poke-through assembly

• US 7,674,990 B2
• Filed: 05/24/2007
• Issued: 03/09/2010
• Est. Priority Date: 12/07/2006
• Status: Active Grant

• Current Assignee: Thomas & Betts International LLC (ABB Limited)
• Original Assignee: Thomas & Betts International Incorporated (ABB Limited)
• Inventors: Drane, Mark R., Jolly, Robert K.
• Primary Examiner(s): PATEL, DHIRUBHAI R
• Application Number:
  US11/752,964
• Publication Number:
  US 20080135285A1
• Time in Patent Office: 1,020 Days
• Field of Search: 174480-496, 174/57, 174/50, 174/51, 439/135, 439/535, 439/536, 439/650, 439/652, 522/205, 522/208, 522/207, 220/3.3, 220/3.4, 220/3.5
• US Class Current: 174/483
• CPC Class Codes: H02G 3/0493 Service poles
• CPC Class Codes: H02G 3/185 Floor outlets and access cups

Abstract

One aspect of the present invention provides a poke-through assembly for installation in a hole in a floor structure. The floor structure defines a floor in a first working environment and a ceiling in a second working environment. The poke-through assembly includes at least one intumescent member, a base plate and an intumescent enclosure. The intumescent member is disposed at least partially between the floor of the first working environment and the ceiling of the second working environment. The base plate supports and is disposed below the intumescent member for limiting the expansion of the intumescent member toward or into the second working environment. Another aspect of the present invention provides a poke-through assembly including an upper frame, at least one intumescent member and an intumescent cover. The intumescent member is disposed below the upper frame. The intumescent cover supports the intumescent member and circumferentially surrounds at least a portion of the intumescent member, wherein expansion of the intumescent member is impeded by the cover.

Claims

1. A poke-through assembly for installation in a hole in a floor structure, said floor structure defining a floor in a first working environment and a ceiling in a second working environment, said poke-through assembly comprising:

an intumescent member disposed at least partially between said floor and said ceiling;

a base plate for supporting said at least one intumescent member, said plate disposed below said intumescent member for limiting the expansion of said intumescent member toward or into said second working environment; and

an enclosure fixedly secured directly to said base plate, said enclosure extending vertically from said base plate and circumferentially surrounding at least a lower portion of said intumescent member, wherein said enclosure includes a plurality of apertures, wherein expansion of said at least one portion passes through said apertures to form a fire stop between said poke-through and a wall of said hole in the floor.

2. The poke-through assembly as set forth in claim 1, wherein said intumescent member can expand radially outwardly through said apertures.

3. The poke-through assembly as set forth in claim 2, wherein said plurality of apertures includes perforations distributed around said enclosure.

4. The poke-through assembly as set forth in claim 1, wherein said enclosure surrounds substantially all of said intumescent member.

5. The poke-through assembly as set forth in claim 4, further comprising:

a conduit disposed below and coupled to said base plate.

6. The poke-through assembly as set forth in claim 1, wherein said base plate includes at least one conduit opening for communicating with a conduit.

7. The poke-through assembly as set forth in claim 6, wherein said conduit opening communicates with an inner portion of said conduit.

8. The poke-through assembly as set forth in claim 6, wherein said conduit opening includes an internal threading for coupling to a conduit.

9. The poke-through assembly as set forth in claim 6, wherein said base plate includes at least one cable opening for passing cables therethrough.

10. A poke-through assembly as set forth in claim 1, wherein said base plate includes more than one aperture for passing at least one cable therethrough, the apertures spaced away from one another.

11. A poke-through assembly for installation in a hole in a floor structure, said floor structure defining a floor in a first working environment and a ceiling in a second working environment, said poke-through assembly comprising:

an upper frame;

an intumescent member disposed below said upper frame; and

an intumescent cover supporting a bottom surface of said intumescent member, said intumescent cover circumferentially surrounding at least a lower portion of said intumescent member, wherein said intumescent cover includes a plurality of apertures, wherein expansion of said at least one portion of said intumescent member passes through said apertures to form a fire stop between said poke-through and a wall of said hole in the floor.

12. The poke-through assembly as set forth in claim 11, wherein said intumescent member can expand radially outwardly through said apertures.

13. The poke-through assembly as set forth in claim 12, wherein said intumescent cover is formed by a base plate and an annular band secured to a perimeter of said base plate.

14. The poke-through assembly as set forth in claim 13, further comprising:

a conduit disposed below said intumescent member, wherein said conduit is coupled to said base plate.

15. The poke-through assembly as set forth in claim 11, wherein said intumescent cover is fixedly secured to said upper frame.

16. The poke-through assembly as set forth in claim 11, wherein said intumescent cover includes at least one conduit opening for communicating with a conduit.

17. The poke-through assembly as set forth in claim 16, wherein said conduit opening communicates with an inner passage of said conduit.

18. The poke-through assembly as set forth in claim 16, wherein said conduit opening includes an internal threading for coupling to said conduit.

19. The poke-through assembly as set forth in claim 16, wherein said intumescent cover includes at least one cable opening for passing cables therethrough.

20. The poke-through assembly as set forth in claim 11, wherein said upper frame includes a receptacle receiving portion.