Patent ID: 11913585
Assignee: HILTI AKTIENGESELLSCHAFT
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  H | IPC F  H

Claim 0:
1. A device, comprising:
a housing, configured to be installed in an aperture in a ceiling or wall of a building, said housing comprising a channel with a first and second end;
two brushes mounted on walls of the housing opposite each other and extending into the channel, the two brushes comprised of bristles with said bristles configured to mesh with each other to close the passage channel, thereby forming a convection barrier;
a first flange and a second flange wherein the first flange is provided to terminate flush with a first corresponding surface of a wall or ceiling of a building and completely surround the aperture as to the first corresponding surface of the wall or ceiling of the building and wherein the second flange is provided to terminate flush with a second corresponding surface of a wall or ceiling of a building and completely surround the aperture as to the second corresponding surface of the wall or ceiling of the building;
a first material mounted on a wall of the housing, the first material comprising an intumescent and extending into the channel at a location between the first end and second end; and
a second material mounted on a wall of the housing opposite the first material, the second material comprising an intumescent and extending into the channel at a location between the first end and second end,
wherein the brushes move to accommodate the passage of an object through the channel, the object to enter the channel at the first end and to exit the channel at the second end,
wherein the first material curves in an axial direction within the channel and at least partially surrounds the object in the channel as the object passes through the channel, and
wherein the first material does not directly contact the second material prior to the object passing through the channel.