EP0406493A1 - A fire curtain installation - Google Patents

A fire curtain installation Download PDF

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Publication number
EP0406493A1
EP0406493A1 EP89306919A EP89306919A EP0406493A1 EP 0406493 A1 EP0406493 A1 EP 0406493A1 EP 89306919 A EP89306919 A EP 89306919A EP 89306919 A EP89306919 A EP 89306919A EP 0406493 A1 EP0406493 A1 EP 0406493A1
Authority
EP
European Patent Office
Prior art keywords
roller
cylinder
pulley
pressurised air
fire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89306919A
Other languages
German (de)
French (fr)
Inventor
David Gwyndon Nash
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuaire Ltd
Original Assignee
Nuaire Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuaire Ltd filed Critical Nuaire Ltd
Priority to EP89306919A priority Critical patent/EP0406493A1/en
Priority to IE376889A priority patent/IE893768A1/en
Priority to AU45675/89A priority patent/AU4567589A/en
Publication of EP0406493A1 publication Critical patent/EP0406493A1/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/10—Fire-proof curtains

Definitions

  • This invention relates to a fire curtain installation; a fire curtain installation is designed to restrict the spread of a fire in a large open planned building and comprises of curtain of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller. It is known to provide an electric motor to rotate the roller to wind up the curtain thereon with a complex electrical control circuit for controlling the motor. It has also been proposed to provided a pneumatic motor, i.e. a piston-in-cylinder arrangement, whose piston is coupled to the roller to wind up the curtain on the roller. In this case there must be provided some control system to control the supply of air to the cylinder.
  • a fire curtain installation comprising a curtain of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller, a pneumatic cylinder which is rested within the roller and whose piston is coupled to the roller via a rope and pulley transmission so that movement of the piston in relation to the cylinder causes the roller to rotate, a pneumatic valve for controlling the supply of pressurised air from a pressurised air source to the pneumatic cylinder, the curtain being normally held in its retracted position by the supply of pressurised air, and control means, operable in response to the presence of fire, to operate the valve means to cut off the supply of pressurised air to the cylinder.
  • rope as used in the specification or claims, is to be understood to cover wire.
  • valve means is operated, in the presence of smoke or fire, to exhaust pressurised air from the cylinder.
  • the cylinder is fixed to the roller and the transmission comprises a first pulley which is carried at the end of the piston, which is rotatable, and around which a rope extends, and a second pulley which is fixed and which is coaxial with the roller, one end of the rope being secured to the roller and the other being wound upon the second pulley, the supply of pressurised air to the cylinder causing the piston to be retracted into the cylinder and the first pulley to be moved away from the second pulley there by unwinding the rope from the fixed pulley and rotating the roller.
  • the first pulley is rotatable about an axis at right angles to that of the roller and the rope extends over a guide pulley in its path between the first pulley and the second pulley, the guide pulley being supported by the roller and being mounted for rotation about an axis at right angles to the axes of the first and second pulleys.
  • control means operates the valve means and exhausts the pressurised air from the cylinder, the curtain unwinds under gravity, there by moving the piston out of the cylinder.
  • the pneumatic cylinder may be provided with a cushioning device at each end.
  • control means comprises a solenoid coupled to the valve means and operable when energised to move the valve means to a position in which pressurised air is supplied to the pneumatic cylinder, means for interrupting the supply of power to the solenoid in the presence of fire, and spring means for urging the valve means to a position in which no pressurised air is supplied to the cylinder and pressurised air is exhausted from the cylinder to atmosphere.
  • a fire curtain 1 is weighted at its bottom end by a T-bar 2 and is wound up on a rotatable roller 3.
  • the curtain 1 extends through a slot in a false ceiling (not shown) in the building in which it is installed.
  • the piston 4 of a pneumatic cylinder 5 is coupled to the rotatable roller 3 via a steel wire and pulley mechanism.
  • the cylinder 5 is fixed to one end plate 6 of the roller 3 and extends within and coaxially with the roller 3.
  • the wire and pulley mechanism firstly comprises a rotatable pulley 7 carried at the end of the piston 4 which, on supply of pressurised air to the cylinder 5, is retracted into the cylinder 5.
  • a steel wire 8 extends around the rotatable pulley 7 and is secured at one end to the other end plate 9 of the rotatable roller 3.
  • the rotatable roller 3 is itself mounted for rotation in relation to a fixed support 10 which consists of a bar with two depending limbs 11 and 12. At their ends the limbs 11 and 12 carry respectively stub shafts 13 and 14 which extend through the end plates 6 and 9 respectively towards each other, at its inner end, the shaft 14 carries a fixed pulley 15 which is parallel to but not fixed to the end plate 9.
  • the end plate 9 carries pulley 16 rotatable about an axis parallel to the end plate 9 and at right angles to the axis of the roller 3.
  • the steel wire 8 extends around the rotatable pulleys 7 and 16 (pulley 16 acts as a guide) and around the fixed pulley 15.
  • the roller as a whole is rotatable about the stub shafts 13 and 14 which have bearings.
  • the piston 4 On supply of pressurised air to the cylinder 5 the piston 4 is drawn in to the cylinder 5 causing the steel rope 8 to be unwound from the fixed pulley 15 and rotation of the roller 3 in the clockwise direction (as seen in figure 1) about stub shafts 13 and 14 so that the curtain 1 is wound up on the roller 3.
  • the movement of the steel wire 8 rotates the rotatable pulleys 7 and 16. Assuming the curtain 1 is fully wound up on to the roller 3 removal of the supply of pressurised air to the cylinder 5 and exhaustion of any pressurised air in that cylinder causes the curtain 1 to fall under the action of the T-bar 2.
  • the cylinder 5 is shown as having adjustable unidirectional flow control restrictors in the supply line 19 which control the rate of ascent or descent of the fire curtain 1.
  • a pressurised air source 20 (which may be a large reservoir to which a compressor is connected) is connected via a valve generally indicated at 21 to the supply line 19 of the pneumatic cylinder 5.
  • the pneumatic valve 21 is a two position device urged to the left (the position shown) by a spring 22 and urged to the right by a solenoid 23 when that solenoid 23 is energised. In the right position, the pressurised air source 20 is connected through the valve 21 to the air supply line 19.
  • the pressurised air source 20 is connected to a blind passage 24 in the valve 21 and the air supply line 19 is connected to exhaust via an adjustable restrictor 25.
  • the solenoid 23 is normally energised from a 24V DC supply source but is connected via an alarm switch and a test switch in series to that supply. Whenever an alarm condition, e.g. fire or smoke is detected, or the test switch is operated, the solenoid 23 is de-energised and the pneumatic cylinder 5 is exhausted to atmosphere via the restrictor 25. As a result the fire curtain 1 will descend at a controlled rate under its own weight drawing the piston 4 out the cylinder 5 through the steel wire 8 and pulley mechanism; will depend on the adjustment of the restrictor 25.
  • an alarm condition e.g. fire or smoke is detected, or the test switch is operated
  • the solenoid 23 is de-energised and the pneumatic cylinder 5 is exhausted to atmosphere via the restrictor 25.
  • the fire curtain 1 will descend at a controlled rate under its own weight drawing the piston 4 out the cylinder 5 through the steel wire 8 and pulley mechanism; will depend on the adjustment of the restrictor 25.
  • the second adjustable flow restrictor 26 filled in the air supply line 19 restricts the flow of air into the cylinder 5.
  • the degree of adjustment of that restrictor would control the rate of ascent of the fire curtain on the supply of pressurised air to the pneumatic cylinder.
  • the control and drive mechanism for the fire curtain 1 illustrated is relatively inexpensive and simple.

Abstract

A fire curtain installation comprises a curtain (1) of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller (3). A pneumatic cylinder (5) is rested within the roller (3) and its piston(4) is coupled to the roller (3) via a wire and pulley transmission so that movement of the piston (4) in relation to the cylinder (5) causes the roller (3) to rotate. A pneumatic valve (21) controls the supply of pressurised air from a pressurised air source (20) to the pneumatic cylinder (5), the curtain (1) being normally held in its retracted position by the supply of pressurised air. Control means, operable in response to the presence of fire, operate the valve means (21) to cut off the supply of pressurised air to the cylinder (5) and to exhaust pressurised air therefrom.

Description

  • This invention relates to a fire curtain installation; a fire curtain installation is designed to restrict the spread of a fire in a large open planned building and comprises of curtain of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller. It is known to provide an electric motor to rotate the roller to wind up the curtain thereon with a complex electrical control circuit for controlling the motor. It has also been proposed to provided a pneumatic motor, i.e. a piston-in-cylinder arrangement, whose piston is coupled to the roller to wind up the curtain on the roller. In this case there must be provided some control system to control the supply of air to the cylinder.
  • It is an object of this invention to provided a relatively simple and improved fire curtain installation.
  • According to this invention, there is provided a fire curtain installation comprising a curtain of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller, a pneumatic cylinder which is rested within the roller and whose piston is coupled to the roller via a rope and pulley transmission so that movement of the piston in relation to the cylinder causes the roller to rotate, a pneumatic valve for controlling the supply of pressurised air from a pressurised air source to the pneumatic cylinder, the curtain being normally held in its retracted position by the supply of pressurised air, and control means, operable in response to the presence of fire, to operate the valve means to cut off the supply of pressurised air to the cylinder.
  • The term "rope" as used in the specification or claims, is to be understood to cover wire.
  • Preferably the valve means is operated, in the presence of smoke or fire, to exhaust pressurised air from the cylinder.
  • Preferably the cylinder is fixed to the roller and the transmission comprises a first pulley which is carried at the end of the piston, which is rotatable, and around which a rope extends, and a second pulley which is fixed and which is coaxial with the roller, one end of the rope being secured to the roller and the other being wound upon the second pulley, the supply of pressurised air to the cylinder causing the piston to be retracted into the cylinder and the first pulley to be moved away from the second pulley there by unwinding the rope from the fixed pulley and rotating the roller.
  • Preferably, the first pulley is rotatable about an axis at right angles to that of the roller and the rope extends over a guide pulley in its path between the first pulley and the second pulley, the guide pulley being supported by the roller and being mounted for rotation about an axis at right angles to the axes of the first and second pulleys.
  • In use, when the curtain is in its operative position (i.e. when it is unwound from the roller), and the valve is operated to connect the pressurised air source to the cylinder, the piston of the cylinder is retracted into the cylinder under the influence of the pressurised air so as to rotate the roller and thereby retract the curtain. As long as this supply of pressurised air to the cylinder is maintained, the curtain will remain retracted.
  • In the event the control means operates the valve means and exhausts the pressurised air from the cylinder, the curtain unwinds under gravity, there by moving the piston out of the cylinder.
  • The pneumatic cylinder may be provided with a cushioning device at each end.
  • Preferably the control means comprises a solenoid coupled to the valve means and operable when energised to move the valve means to a position in which pressurised air is supplied to the pneumatic cylinder, means for interrupting the supply of power to the solenoid in the presence of fire, and spring means for urging the valve means to a position in which no pressurised air is supplied to the cylinder and pressurised air is exhausted from the cylinder to atmosphere.
  • A fire curtain installation in accordance with this invention will now be described, by way of example only, do the reference of the company drawing of which:-
    • Figure 1 is a schematic view of the fire curtain installation; and
    • Figure 2 is a pneumatic and electrical circuit diagram.
  • Referring to Figure 1, a fire curtain 1 is weighted at its bottom end by a T-bar 2 and is wound up on a rotatable roller 3. The curtain 1 extends through a slot in a false ceiling (not shown) in the building in which it is installed. The piston 4 of a pneumatic cylinder 5 is coupled to the rotatable roller 3 via a steel wire and pulley mechanism. The cylinder 5 is fixed to one end plate 6 of the roller 3 and extends within and coaxially with the roller 3. The wire and pulley mechanism firstly comprises a rotatable pulley 7 carried at the end of the piston 4 which, on supply of pressurised air to the cylinder 5, is retracted into the cylinder 5. A steel wire 8 extends around the rotatable pulley 7 and is secured at one end to the other end plate 9 of the rotatable roller 3. The rotatable roller 3 is itself mounted for rotation in relation to a fixed support 10 which consists of a bar with two depending limbs 11 and 12. At their ends the limbs 11 and 12 carry respectively stub shafts 13 and 14 which extend through the end plates 6 and 9 respectively towards each other, at its inner end, the shaft 14 carries a fixed pulley 15 which is parallel to but not fixed to the end plate 9. The end plate 9 carries pulley 16 rotatable about an axis parallel to the end plate 9 and at right angles to the axis of the roller 3. The steel wire 8 extends around the rotatable pulleys 7 and 16 (pulley 16 acts as a guide) and around the fixed pulley 15.
  • The roller as a whole is rotatable about the stub shafts 13 and 14 which have bearings. On supply of pressurised air to the cylinder 5 the piston 4 is drawn in to the cylinder 5 causing the steel rope 8 to be unwound from the fixed pulley 15 and rotation of the roller 3 in the clockwise direction (as seen in figure 1) about stub shafts 13 and 14 so that the curtain 1 is wound up on the roller 3. The movement of the steel wire 8 rotates the rotatable pulleys 7 and 16. Assuming the curtain 1 is fully wound up on to the roller 3 removal of the supply of pressurised air to the cylinder 5 and exhaustion of any pressurised air in that cylinder causes the curtain 1 to fall under the action of the T-bar 2. This rotates the roller 3 in the anti-clockwise direction (as seen in figure 1) about the stub shafts 13 and 14 so that the steel wire 8 is wound up on to the fixed pulley 15. During this action the piston 4 is drawn out of the cylinder 5 and the rotatable pulleys 7 and 16 are rotated about their axes by the motion of the steel wire 8. An air supply line is connected to the cylinder 5 which is cushioned at each end, in known manner, and has its own air exhaust (not shown).
  • Referring now to Figure 2, the cylinder 5 is shown as having adjustable unidirectional flow control restrictors in the supply line 19 which control the rate of ascent or descent of the fire curtain 1. A pressurised air source 20 (which may be a large reservoir to which a compressor is connected) is connected via a valve generally indicated at 21 to the supply line 19 of the pneumatic cylinder 5.
  • The pneumatic valve 21 is a two position device urged to the left (the position shown) by a spring 22 and urged to the right by a solenoid 23 when that solenoid 23 is energised. In the right position, the pressurised air source 20 is connected through the valve 21 to the air supply line 19.
  • When the valve 21 moves to the left on de-energisation of the solenoid 23, the pressurised air source 20 is connected to a blind passage 24 in the valve 21 and the air supply line 19 is connected to exhaust via an adjustable restrictor 25.
  • The solenoid 23 is normally energised from a 24V DC supply source but is connected via an alarm switch and a test switch in series to that supply. Whenever an alarm condition, e.g. fire or smoke is detected, or the test switch is operated, the solenoid 23 is de-energised and the pneumatic cylinder 5 is exhausted to atmosphere via the restrictor 25. As a result the fire curtain 1 will descend at a controlled rate under its own weight drawing the piston 4 out the cylinder 5 through the steel wire 8 and pulley mechanism; will depend on the adjustment of the restrictor 25.
  • The second adjustable flow restrictor 26 filled in the air supply line 19 restricts the flow of air into the cylinder 5. The degree of adjustment of that restrictor would control the rate of ascent of the fire curtain on the supply of pressurised air to the pneumatic cylinder.
  • The control and drive mechanism for the fire curtain 1 illustrated is relatively inexpensive and simple.

Claims (6)

1. A fire curtain installation comprising a curtain (1) of flexible fire-proof material wound upon, and adapted to unwind under gravity from, a rotatable roller (3), a pneumatic cylinder (5) whose piston (4) is coupled to the roller (3) through a mechanical transmission which coverts linear motion into rotary motion, a pneumatic valve (21) for controlling the supply of pressurised air from a pressure air source (20) to the pneumatic cylinder (5), the curtain (1) being normally held in its reacted position by the supply of pressurised air, and control means, operable in response to the presence of fire, to operate the valve means (21) to cut off the supply of pressurised air to the cylinder (5) characterised in that the pneumatic cylinder (5) is rested within the roller (3) and in that the piston (4) is coupled to the roller (3) via a rope and pulley transmission.
2. A fire curtain installation according to claim 1 characterised in that the valve means (21) is operated, in the presence of fire, to exhaust pressurised air from the cylinder (5).
3. A fire curtain installation according to claim 1 or 2 characterised in that the cylinder (5) is fixed to the roller (3) and the transmission comprises a first pulley (7) which is carried at the end of the piston (4), which is rotatable, and around which a rope (8) extends, and a second pulley (15) which is fixed and which is coaxial with the roller (3), one end of the rope (8) being secured to the roller (3) and the other being wound upon the second pulley (15), the supply of pressurised air to the cylinder (5) causing the piston (4) to be retracted into the cylinder (5) and the first pulley (7) to be moved away from the second pulley (15) there by unwinding the rope (8) from the fixed pulley and rotating the roller (3).
4. A fire curtain according to claim 3 characterised in that the first pulley (7) is rotatable about an axis at right angles to that of the roller (3) and the rope (8) extends over a guide pulley (16) in its path between the first pulley (7) and the second pulley (15), the guide pulley (16) being supported by the roller (3) and being mounted for rotation about an axis at right angles to the axes of the first and second pulleys (7, 15).
5. A fire curtain according to any of claims 1 to 4 characterised in the pneumatic cylinder (5) is provided with a cushioning device at each end.
6. A fire curtain according to any of claims 1 to 5 wherein the control means comprises a solenoid (23) coupled to the valve means (21) and operable when energised to move the valve means (21) to a position in which pressurised air is supplied to the pneumatic cylinder (5), means for interrupting the supply of power to the solenoid (23) in the presence of fire, and spring means (22) for urging the valve means (21) to a position in which no pressurised air is supplied to the cylinder (5) and pressurised air is exhausted from the cylinder (5) to atmosphere.
EP89306919A 1989-07-07 1989-07-07 A fire curtain installation Withdrawn EP0406493A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP89306919A EP0406493A1 (en) 1989-07-07 1989-07-07 A fire curtain installation
IE376889A IE893768A1 (en) 1989-07-07 1989-11-24 A fire curtain installation
AU45675/89A AU4567589A (en) 1989-07-07 1989-11-29 A fire curtain installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89306919A EP0406493A1 (en) 1989-07-07 1989-07-07 A fire curtain installation

Publications (1)

Publication Number Publication Date
EP0406493A1 true EP0406493A1 (en) 1991-01-09

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ID=8202731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89306919A Withdrawn EP0406493A1 (en) 1989-07-07 1989-07-07 A fire curtain installation

Country Status (3)

Country Link
EP (1) EP0406493A1 (en)
AU (1) AU4567589A (en)
IE (1) IE893768A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158144A (en) * 1991-04-12 1992-10-27 Shaw Mark D Device and method to extinguish oil well fires
EP0572200A1 (en) * 1992-05-23 1993-12-01 Colt International Holdings A.G. A smoke apron
WO1994002208A1 (en) * 1992-07-23 1994-02-03 Environmental Seals Limited Improvements in or relating to fire barriers
GB2296658A (en) * 1995-01-04 1996-07-10 Meggitt Fire curtain system
WO1997035642A1 (en) * 1996-03-26 1997-10-02 Obayashi Corporation Walk-through type waterproof screen apparatus
EP1380321A1 (en) * 2002-07-13 2004-01-14 Andrew Paul Cooper Fail safe actuator
CN109200504A (en) * 2018-11-28 2019-01-15 佛山市智阳能源有限公司 A kind of automatic fire extinguisher for photovoltaic combiner box
RU189156U1 (en) * 2017-10-19 2019-05-15 Роман Олегович Русских FIRE FIGHTING
CN113964664A (en) * 2021-09-24 2022-01-21 江苏江阴华明电气设备有限公司 Multifunctional modular intelligent low-voltage draw-out type switch cabinet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB882468A (en) * 1957-09-26 1961-11-15 Alan Adair Emery An improved apparatus for opening or closing doors and the like
EP0002542A1 (en) * 1977-12-09 1979-06-27 Gilbert Robert Jonckheere Fire-retardant curtain with positive drive
GB2108839A (en) * 1981-10-13 1983-05-25 Andrew Paul Cooper Fire screens or curtains

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB882468A (en) * 1957-09-26 1961-11-15 Alan Adair Emery An improved apparatus for opening or closing doors and the like
EP0002542A1 (en) * 1977-12-09 1979-06-27 Gilbert Robert Jonckheere Fire-retardant curtain with positive drive
GB2108839A (en) * 1981-10-13 1983-05-25 Andrew Paul Cooper Fire screens or curtains

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158144A (en) * 1991-04-12 1992-10-27 Shaw Mark D Device and method to extinguish oil well fires
EP0572200A1 (en) * 1992-05-23 1993-12-01 Colt International Holdings A.G. A smoke apron
WO1994002208A1 (en) * 1992-07-23 1994-02-03 Environmental Seals Limited Improvements in or relating to fire barriers
GB2296658A (en) * 1995-01-04 1996-07-10 Meggitt Fire curtain system
WO1997035642A1 (en) * 1996-03-26 1997-10-02 Obayashi Corporation Walk-through type waterproof screen apparatus
EP1380321A1 (en) * 2002-07-13 2004-01-14 Andrew Paul Cooper Fail safe actuator
RU189156U1 (en) * 2017-10-19 2019-05-15 Роман Олегович Русских FIRE FIGHTING
CN109200504A (en) * 2018-11-28 2019-01-15 佛山市智阳能源有限公司 A kind of automatic fire extinguisher for photovoltaic combiner box
CN113964664A (en) * 2021-09-24 2022-01-21 江苏江阴华明电气设备有限公司 Multifunctional modular intelligent low-voltage draw-out type switch cabinet
CN113964664B (en) * 2021-09-24 2023-12-05 江苏江阴华明电气设备有限公司 Multifunctional modularized intelligent low-voltage draw-out type switch cabinet

Also Published As

Publication number Publication date
IE893768A1 (en) 1991-01-16
AU4567589A (en) 1991-01-10

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