Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L5/00—Devices for use where pipes, cables or protective tubing pass through walls or partitions
  • F16L5/02—Sealing
  • F16L5/04—Sealing to form a firebreak device
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
  • H02G3/02—Details
  • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
  • H02G3/0406—Details thereof
  • H02G3/0412—Heat or fire protective means
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
  • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings

Definitions

• the present invention concerns a fire stop to be used as a transition of a cable, wire, tube or pipe through a wall or the like.
• Transitions for cables, wires or pipes are used for sealing in many different environments, such as for houses, cabinets, technical shelters, junction boxes and machines. They are used in different industrial environments, such as automotive, telecom, power generation and distribution, as well as marine and offshore.
• One object for many transitions is to hinder or at least obstruct a possible fire to advance through a wall along a cable, wire, tube or pipe.
• an intumescent material is a material which swells when exposed to heat. Examples of intumescent material are "ZZ- Brandstoffschaum 2K NE” from ZAPP-ZIMMERMANN GmbH, and "ROKU ® STRIP" from Rolf Kuhn GmbH.
• the fire stop of the present invention is developed for use indoors and with relatively low demands on sealing capacity.
• the main protective object is to obstruct that a possible fire protrudes through a transition of a wall, ceiling, floor etc.
• One object is that the fire stop shall be easy to install without the use of any tools.
• the fire stop should exert some force both inwards against a received cable, wire or pipe and outwards against the inner wall of the opening of a wall receiving the fire stop. Thus, it will have a sealing effect.
• an outer body of the fire stop is made of three portions connected to each other along two folding lines. This is done to increase and provide a more even springy effect and partial holding capability.
• the outer body is produced in a position slightly opened and a certain force is required to close it around a cable or the like.
• the folding along two lines has two major advantages compared to a single folding line with otherwise identical dimensions. It increases the springy effect and it increases the contact surface area inside the hole, when it is only partly introduced in said hole into which it is to be installed. This is a clear advantage if the product is inserted into a hole where you may need to change hand grip from partly inserted to fully inserted.
• An outer body having two folding lines allows itself to open more to receive the cable etc. compared to an outer body having a single folding line.
• the fire stop of the present invention comprises blocks of intumescent material.
• To produce the material in form of blocks can be done relatively easy and at low cost, compared to solutions where the intumescent material is formed into parts connected to each other along a folding line or the like.
• the blocks of intumescent material are to be placed inside the outer body of the fire stop.
• the intumescent material of the blocks is soft, to yield and be formed around a cable, wire or pipe received inside the fire stop.
• the arrangement of two blocks of intumescent material also facilitates insertion of a cable etc., in that the blocks move apart from each other in an arc when opening the outer body due to the two folding lines.
• the fire stop of the present invention opens in a far more convenient way to receive a cable, wire, tube or pipe.
• Fig. 1 is a perspective view of a fire stop according to the present invention
• Fig. 2 is a side view of the fire stop of Fig. 1,
• Fig. 3 is an end view of the fire stop of Figs. 1 and 2,
• Fig. 4 is an end view of the fire stop corresponding with Fig. 3 but without blocks of intumescent material
• Fig. 5 is a side view of the fire stop receiving a cable and in the position as installed in an opening
• Fig. 6 is a sectional view taken along the line A- A in Fig. 5.
• Fig. 1 one example of a fire stop 1 according to the present invention is shown.
• the fire stop 1 has two blocks 2 of intumescent material placed inside an outer body.
• the outer body is formed of a first portion 3, a second portion 4 and a third portion 5.
• Said three portions 3, 4, 5 together form two separate inner spaces 6 for receiving the blocks 2 of intumescent material.
• One separate block 2 of intumescent material is received in each of the inner spaces 6.
• the outer body of the fire stop 1 is made of a rubber material.
• the intumescent material used is relatively soft to yield around a cable etc. received inside the fire stop 1.
• the three portions 3, 4, 5 forming the outer body of the fire stop 1, are inte- grated and are connected to each other by means of two hinge parts 7, 8.
• folding lines are formed between the portions 3, 4, 5 of the outer body.
• the hinge parts 7, 8 are preloaded in such a way that the portions 3, 4, 5 are urged away from each other.
• the hinge parts 7, 8 have a spring action and due to said spring action, the three portions 3, 4, 5 of the fire stop 1 are in the positions as shown in the Figs. 1-4 if not affected by any outer forces.
• a slit is formed between adjacent portions 3, 4, 5 of the outer body of the fire stop 1, by means of the spring action of the hinge parts 7, 8.
• each of the three portions 3, 4, 5 of the outer body of the fire stop 1 has a projecting part 15, 16, 17 projecting radially inwards. Walls of the inner spaces are formed of said projecting parts 15, 16, 17 of the portions 3, 4, 5, which inner spaces 6 receive the blocks 2 of intumescent material.
• the projecting parts 15, 16, 17 form stops for the blocks 2, in one axial direction.
• the projections 15, 16, 17 have a thickness in axial direction.
• the radially inner side 9, 10, 11 of each projection 15, 16, 17 has a rounded form, as seen in cross section.
• the rounded inner sides 9, 10, 11 of the projections 15, 16, 17 will form a through opening when the fire stop 1 is pushed together, whereby the three portions 3, 4, 5 abut each other.
• the curvatures of the rounded inner sides 9, 10, 11 are such that the through opening formed will be cylindrical having an inner diameter adapted to the outer diameter of the cable to be received inside the fire stop 1.
• the first and third portions 3, 5 of the fire stop 1 are placed at opposite sides of the second portion 4 of the fire stop 1.
• the first portion 3 has a radial surface 18 extending along the entire axial length of the first portion 3.
• the third portion 5 has a radial surface 19 extending along the entire length of the third portion 5.
• the radial surfaces 18, 19 of the first portion 3 and the third portion 5, respectively, are to abut each other when the fire stop 1 is pressed together.
• the fire stop 1 will have a cylindrical outer form, by means of the three portions 3, 4, 5.
• In the open condition of the fire stop 1 there is a gap between the radial surfaces 18, 19 between the first and third portions 3, 5 of the outer body of the fire stop 1.
• a cable, wire or pipe may be inserted in radial direction into the inside of the fire stop 1.
• a number of flanges 12 are arranged on the radially outer surfaces of the three portions 3, 4, 5 of the fire stop 1.
• the flanges 12 are arranged at an equal axial distance from each other.
• the flanges 12 are arranged in corresponding positions on the three portions 3, 4, 5 of the fire stop 1, whereby the flanges 12 will form outer rings when the fire stop 1 is pressed together.
• the outer diameter of the rings formed by the flanges 12 is somewhat larger than the inner diameter of an opening to receive the fire stop 1.
• the flanges 12 are mainly intended to give a retaining force when the fire stop 1 is placed in an opening. Said retaining force is especially important for vertically placed fire stops 1.
• the inner spaces 6 for receiving the blocks 2 of intumescent material are open at one axial end 26. At the other axial end the inner spaces 6 are restricted by the pro- truding parts 15, 16, 17 of the three portions 3, 4, 5 of the outer body of the fire stop 1.
• the inner spaces 6 are defined by the protrusions 15, 16, 17 and the inner surfaces of the three portions 3, 4, 5 of the fire stop 1.
• the outlines of the inner surfaces of the three portions 3, 4, 5 are adapted to the shape of the blocks 2 of intumescent material.
• each of said blocks 2 of intumescent material have the shape of a rectangular parallelepiped.
• the first portion 3 of the outer body of the fire stop 1 has two inner walls 21, 22 extending in axial direction from the open axial end 26 of the inner space 6 to the projecting part 15.
• the inner walls 21, 22 are perpendicular to each other.
• the second portion 4 has one inner wall 23 extending in axial direction from the open axial end 26 of the inner spaces 6 to the projecting part 16.
• the third portion 5 has two inner walls 24, 25 extending in axial direction from the open axial end 26 of the inner space 6 to the projecting part 17.
• the inner walls 24, 25 of the third portion 5 are perpendicular to each other.
• One edge of the inner wall 23 of the second portion 4 of the outer body of the fire stop 1 is placed adjacent one edge of one of the inner walls 22 of the first portion 3.
• the opposite edge of the inner wall 23 of the second portion 4 is placed adjacent one edge of one of the inner walls 24 of the third portion 5.
• one of the inner walls 21 of the first portion will coincide with one of the inner walls 25 of the third portion 5.
• the inner spaces 6 will thereby be formed to receive the two blocks 2 of intumescent material having the shape of a rectangular parallelepiped.
• the portions 3, 4, 5 forming the outer body are chamfered.
• Each chamfer 13 has a straight ring part 14 at the outer end.
• the ring parts 14 of the portions 3, 4, 5 will form a ring when the fire stop 1 is pressed together.
• the end is made with a smaller diameter, followed by a chamfer 13 to the outer full diameter of the outer body of the fire stop. This will simplify installation in places e.g. where light is bad or you cannot see the hole into which the product is inserted. It is a tactile function where you can actually feel your way to the insertion point more easily.
• a cable 20 is to be received inside the fire stop 1, whereby the cable 20 is placed between the blocks 2 of intumescent material.
• the blocks 2 are placed in the inner spaces 6 of the outer body.
• the fire stop 1 is pre-tensioned to a slightly open position, whereby a gap is formed between the radial surfaces 18, 19 of the first and third portions 3, 5 of the outer body of the fire stop 1.
• the cable 20 is inserted through said gap formed between the radial surfaces 18, 19.
• cables 20 of a range of different outer diameters may be received.
• the fire stop 1 is then pressed together and pushed into an opening of a wall etc., with the cable 20 in the centre.
• the fire stop 1 is pushed into the opening with the axial open end 26 of the inner space 6 first. Said insertion is facilitated by the chamfers 13 at the axial open end 26 of the inner spaces 6.
• the outer diameter of the fire stop 1, when pressed together is somewhat larger than the inner diameter of the opening receiving the fire stop 1.
• the blocks 2 of intumescent material will be pressed inwards towards the cable 20 when the fire stop 1 is placed in the opening.
• the outer surface, including the flange 12 will be pressed against the inner surface of the opening.
• the compression force in enhanced by the cable and the amount of enhancement depends on the outer diameter of the cable 20. No tool is needed for the mounting of the fire stop 1, with cable 20 received, inside an opening of a wall or the like.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Installation Of Indoor Wiring (AREA)
• Building Environments (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (1)

Citations (4)

• 2014
  • 2014-12-03 SE SE1451473A patent/SE1451473A1/sv unknown
• 2015
  • 2015-12-02 WO PCT/SE2015/051295 patent/WO2016089290A1/en active Application Filing

Patent Citations (4)

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