Intumescable fire stop device

• US 5,103,609 A
• Filed: 11/15/1990
• Issued: 04/14/1992
• Est. Priority Date: 11/15/1990
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Thoreson, Thomas L., McCurdy, deceased, Robert C.
• Primary Examiner(s): Murtagh, John E.
• Application Number:
  US07/614,138
• Time in Patent Office: 516 Days
• Field of Search: 52/232, 52/221
• US Class Current: 52/232
• CPC Class Codes: A62C 2/065 having as the main closure device materials, whose characteristics undergo an irreversible change under high temperatures, e.g. intumescent
• CPC Class Codes: F16L 5/04 to form a firebreak device
• CPC Class Codes: H02G 3/22 Installations of cables or lines through walls, floors or ceilings, e.g. into buildings

Abstract

An intumescable fire stop device that is easy to install and effectively and efficiency channels heat to an intumescent material so that the intumescent material expands quickly and uniformly includes a collar. An inner surface of the collar has a plurality of heat conducting tabs that extend outwardly and secure the intumescent material to the collar. The heat conducting tabs extend into the intumescent material and thereby effectively channel heat from a fire into the interior regions of the intumescent material so that the intumescent material expands quickly and uniformly. The collar further includes a first interlocking end having a plurality of spaced openings. The spaced openings are configured to receive spaced fingers on a second interlocking end of the collar. The interengagement of the fingers and openings allows the collar to be firmly secured about a section of a pipe. The collar has a plurality of releasibly secured Z-shaped mounting clips. The mounting clips are used to secure the collar to a firm, structural surface such as a wall or ceiling having an opening through which the pipe passes.

Claims

1. An intumescable fire stop device which has a collar that supports an intumescent material about a section of a pipe, such that when the intumescent material becomes sufficiently heated it expands to close off the section of the pipe and create a fire stop barrier along the pipe, the improvement which comprises:

a plurality of heat conducting tabs arranged about the collar, the tabs projecting toward the pipe and into the intumescent material, for channeling heat into the interior of the intumescent material so that the intumescent material expands quickly and uniformly, the collar including first and second interlocking ends such that the first interlocking end cooperates with the second interlocking end to secure the collar about the section of the pipe, the collar being sufficiently flexible to allow the first and second interlocking ends to be spread apart for installation of the collar about the section of the pipe.

2. The fire stop device of claim 1 wherein the first interlocking end has at least one slot and the second interlocking end has at least one finger which is configured to engage the at least one slot to thereby secure the collar about the section of the pipe.

3. The fire stop device of claim 1 wherein the collar further includes:

a plurality of mounting clips for securing the collar to a firm surface such as a wall or ceiling having an opening through which the pipe passes.

4. The fire stop device of claim 3 wherein each of the plurality of mounting clips includes:

a connecting plate through which the mounting clip is coupled to the collar; and

a top plate extending from the connecting plate at a first end thereof, wherein the top plate is configured to cooperate with the firm surface to thereby secure the collar to the firm surface about the section of the pipe.

5. The fire stop device of claim 4 wherein each of the plurality of mounting clips further includes:

a bottom plate extending from the connecting plate at a second end thereof, wherein the bottom plate is configured to engage a bottom edge of the collar to help support the collar when the collar is secured about the section of the pipe.

6. The fire stop device of claim 5 wherein the top plate extends in a first direction from the connecting plate and the bottom plate extends from the connecting plate in a second direction opposite to the first direction.

7. The fire stop device of claim 3 wherein the plurality of mounting clips are substantially equally spaced about the collar.

8. The fire stop device of claim 4 wherein the connecting plate has a mounting aperture, and the collar includes a plurality of mounting projections that are configured to releasibly engage the mounting apertures of corresponding mounting clips to secure the mounting clips to the collar.

9. The fire stop device of claim 1, and further including:

a flat strip of moldable putty along a portion of an inner surface of the intumescent material, and along a top edge of the intumescent material, the moldable putty forming a seal between the pipe and a firm surface, such as a wall or ceiling having an opening through which the pipe passes, when the collar is secured about the section of the pipe.

10. The fire stop device of claim 9 wherein the flat strip of moldable putty further extends along first and second end edges of the intumescent material and forms a seal between the first and second end edges of intumescent material when the collar is secured about the section of pipe.

11. The fire stop device of claim 8 wherein the tabs and the mounting projections are integrally formed with the collar.

12. The fire stop device of claim 1 wherein the plurality of tabs are generally equally spaced about the collar.

13. In an intumescable fire stop device which has a collar that supports an intumescent material about a section of a pipe, such that when the intumescent material becomes sufficiently heated it expands to close off the section of the pipe and create a fire stop barrier along the pipe, the improvement which comprises:

first and second interlocking ends on the collar, the first interlocking end having a plurality of spaced slots and the second interlocking end including a plurality of spaced fingers that are configured to extend through the slots and be bent back upon themselves to interlock the first and second interlocking ends and thereby secure the collar about the section of the pipe.

14. The fire stop device of claim 13 wherein the collar includes:

a plurality of heat conducting tabs arranged about the collar, the tabs projecting into the intumescent material, for securing the intumescent material to the collar and for channeling heat into the interior of the intumescent material so that the intumescent material expands quickly and uniformly.

15. The fire stop device of claim 13, and further including:

a plurality of substantially Z-shaped mounting clips releasibly secured to the collar for securing the collar to a firm surface such as a wall or ceiling having an opening through which the pipe passes.

16. In an intumescable fire stop device which has a collar that supports an intumescent material about a section of a pipe, such that when the intumescent material becomes sufficiently heated it expands to close off the section of the pipe and create a fire stop barrier along the pipe, the improvement which comprises:

a plurality of mounting clips for securing the collar to a firm surface such as a wall or ceiling having an opening through which the pipe passes, each of the plurality of mounting clips including;

a connecting plate through which the mounting clip is readily, releasably coupled to the collar; and

a top plate extending from the connecting plate at a first end thereof, wherein the top plate is configured to cooperate with the first surface to thereby secure the collar to the firm surface about the section of the pipe.

17. The fire stop device of claim 16 wherein each of the plurality of mounting clips further includes:

a bottom plate extending from the connecting plate at a second end thereof, wherein the bottom plate is configured to engage a bottom edge of the collar to help support the collar when the collar is secured about the section of the pipe.

18. The fire stop device of claim 16 wherein the connecting plate has a mounting aperture, and the collar includes a plurality of mounting projections that are configured to releasibly engage the mounting apertures of corresponding mounting clips to secure the mounting clips to the collar.