GB2121873A - Actuating systems for operating doors - Google Patents
Actuating systems for operating doors Download PDFInfo
- Publication number
- GB2121873A GB2121873A GB8316084A GB8316084A GB2121873A GB 2121873 A GB2121873 A GB 2121873A GB 8316084 A GB8316084 A GB 8316084A GB 8316084 A GB8316084 A GB 8316084A GB 2121873 A GB2121873 A GB 2121873A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- heater
- door
- joint
- gas container
- 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- Withdrawn
Links
- 230000004044 response Effects 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 239000000779 smoke Substances 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 4
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 2
- 238000007747 plating Methods 0.000 claims 1
- 239000000155 melt Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C2/00—Fire prevention or containment
- A62C2/06—Physical fire-barriers
- A62C2/24—Operating or controlling mechanisms
- A62C2/241—Operating or controlling mechanisms having mechanical actuators and heat sensitive parts
- A62C2/242—Operating or controlling mechanisms having mechanical actuators and heat sensitive parts with fusible links
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
- E05F1/002—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means
- E05F1/006—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means by emergency conditions, e.g. fire
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/60—Power-operated mechanisms for wings using electrical actuators
- E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
- E05F15/611—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for swinging wings
- E05F15/63—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for swinging wings operated by swinging arms
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
- E05Y2201/404—Function thereof
- E05Y2201/41—Function thereof for closing
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
- E05Y2201/43—Motors
- E05Y2201/434—Electromotors; Details thereof
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
- E05Y2800/25—Emergency conditions
- E05Y2800/254—Emergency conditions the elements not functioning in case of emergency
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
- E05Y2800/34—Form stability
- E05Y2800/342—Deformable
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/13—Type of wing
- E05Y2900/132—Doors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Safety Valves (AREA)
Abstract
The present invention relates to actuating systems using a sealed liquified gas container 1 in which the gas is typically carbon dioxide. Means are provided for releasing the gas in response to an electrical signal derived from various sources to close doors, to move loads or to open or close valves in emergency situations. The liquified gas container 1, a piercing member 2, a spring 3 and a spring retaining piston 34 are contained in a replaceable cartridge 5. Situated around an anchor ring 6 is a low power fast response heater 8 which melts a low melting point alloy soldered joint 7 which joins a piston 4 to an anchor ring 6. In operation, pressure from the liquified gas container is released as follows: a signal from a smoke detector or alternative source allows current to flow to the heater to melt the soldered joint 7, allowing pressure from the liquified gas container to move a piston 15 to rotate a lever 30 to close a door. Within the piston 15 is contained a ball 22 and detent arrangement 23 and 26 controlling the position of a valve arrangement comprising a seal 27 and an annulus 25 causing the pressure on either side of the piston 15 to be balanced following the first stroke, thus providing a lower level of resisting and operating forces for subsequent operations. <IMAGE>
Description
SPECIFICATION
Improvements in actuating systems
The present invention relates to systems which use liquified gas, typically carbon dioxide, stored in a sealed cylindrical gas container, whereby means are provided for piercing the cylinder in response to a signal such as a smoke detector to release gas to an actuating cylinder to cause opening or closing of a door, window or valve. Embodiments of the present invention are particularly suitable for use in emergency and safety systems.
Emergency systems by their nature are required to be inoperative for a long period of time but must have a high probability of working when called upon. In emergency systems such as automatically closing fire doors, the doors are arranged to be latched into an open position normally by means of electro magnetic latches which allow the door to be closed when the circuit is de-energised in response to an electrical signal typically derived from a smoke sensor. The force to close the door is normally provided by means of springs or weights. Such systems are limited by the level of force which can be made available to close the door and also use continuously energised electrical systems which are therefore prone to failure.The present system seeks to provide a door closer capable of providing large closing forces and which is entirely passive until it receives an electrical signal from a smoke sensor.
After initial operation to close the door the force provided by the door closer is greatly reduced enabling easy opening.
In the present invention the door closer is situated adjacent to the door but not attached to it such that it is entirely passive until activated by a signal derived typically from a smoke sensor. The door may be open or latched with a simple spring loaded ball catch or magnetic catch, or remain unlatched and free to move until a pre-determined signal derived from the smoke sensor causes release of the stored energy from a liquified gas container which then, via an actuating device, applies the force to the door to cause it to close.
The gas pressure developed in the actuating cylinder will then continue to apply a force to hold the door closed.
According to one aspect of the invention the liquified gas container, together with a member for piercing the container, are situated in a replaceable cartridge which also contains a spring held in its compressed position by a member reacting the load back to the replaceable cartridge housing by means of a soldered joint. The soldered joint is made using a low melting point alloy.
Situated in the immediate vicinity of the low melting point alloy joint and around the circumference of the replaceable cartridge is a low power heating element. Upon energising the heating element from an electrical supply, activated by a smoke sensor, the low melting point alloy melts causing the spring to apply an impact load to a piercing member causing the liquified gas container to be pierced. The gas from the liquified gas container is transferred to a piston type actuator to which means are attached for transmitting the force applied by the gas pressure to cause the door to close. The use of the soldered joint provides a high reliability retaining element for the gas pressure release mechanism and the use of the low melting point alloy as the solder enables the use of a low power fast response heating element to melt the joint.
Because of its low power, the heating element can be allowed to operate continuously without causing damage and with an acceptable low power drain, which is important when operated from battery systems, without the need to switch off the power. The cylindrical gas container, piercing member, release spring piston and its associated soldered joint are contained within a replaceable cartridge which is used once only, thus eliminating the unreliability due to wear etc, whilst enabling a rapid return to normal operational capability foliowing inadvertent operation due to false alarms.
In one embodiment of the present invention, when the door has reached its near closed position, pressure is connected by means of a valve either formed in the actuating piston or as a separate item, to the rod end side of the piston to reduce the force necessary to open the door. For subsequent opening and closing operations the force will remain at this reduced level. With this arrangement a very large force is provided for the first closing action in order to overcome any resistance to closing which may occur due to the door having been heid open by some form of weight, ball catch or other means. This arrangement provides two different levels of force from the door closer without resort to continuously bleeding gas.
In another embodiment of the present invention the output from the piston is caused to open or close a valve in response to some external signal.
In this case a two-stage force system will not normally be required and a conventional piston is used.
Embodiments of the present invention will be more particularly described by way of example with reference to the accompanying drawings in which Figure 1 shows the construction of a passive door closer, Figure 2 shows a passive door closer in relation to a typical door installation,
Figure 3 shows a fast response heater and joint assembly, and Figure 4 shows a construction of a valve actuator.
Figure 1 shows a construction of a passive door closer which is arranged as shown in Figure 2 to close the door in the presence of a fire. Referring to Figure 1, a liquified gas container 1, piercing member 2, spring 3 and spring retaining piston 3L are contained in a replaceable cartridge 5. Spring retaining piston 34 is connected to anchor ring 6 via piston rod 4 and soldered joint 7. Situated around anchor ring 6 is a low power heater 8 which is electrically powered in response to a signal from a smoke detector 37 (Figure 2) via plug and socket 9 and terminal block 10.
In operation, pressure from the liquified gas
container is released as follows: a signal from a
smoke detector 37 (Figure 2) allows current from
a battery, or transformed main current, to flow to
the heater 8 which will rapidly melt the soldered joint 7, allowing spring 3 to accelerate piston 34
causing piston rod 4 to strike piercing member 2 to pierce sealed liquified gas container 1. Gas is released into chamber 11 via sealed connector 12 and transfer hole 1 3. The pressure acting on piston 1 5 and piston rod 1 6 rotates pinion 1 7 via
rack 1 8 thereby causing rotation of shaft 1 9 and
lever 30 which closes the door via roller 44
(Figure 2).
When the door has reached some point in its travel approaching the fully closed condition,
movement of piston 1 5 is arrested by face 20.
Prior to this time a very large force was provided
by pressure acting on both piston 1 5 and piston
rod 1 6, via face 21, enabling the door to move
weights or any other objects which may have been
used to hold it open in a partiai or fully open
position. When piston 1 5 engages with face 20
pressure acting on the end of piston rod 1 6 ioads
ball 22 seated in detent 23, causing the ball to
move outwards against spring 24 thus allowing
piston rod 1 6 to move relative to piston 1 5 until
ball 22 engages with detent 25.As piston rod 1 6 reaches the position where ball 22 is engaging
into detent 25, annulus 26 passes over seal 27
allowing pressure to be connected from chamber
11 to chamber 28 via slot 38, annulus 26 and
transfer hole 29. The pressure forces on piston 1 5 are now balanced and the force finally latching the
door is provided by the pressure acting on the area
of piston rod 1 6. Therefore for subsequent
opening of the door, i.e. to enable occupants of a
room to exit through the door without difficulty, a
very much reduced force is provided.
As piston rod 1 6 and rack 1 8 are separate
components inadvertent movement of lever 30
cannot be transmitted to cause movement of
piston 1 5 with the door closer in its normal
passive state. The lever 30 can therefore take up
any angle without movement of piston 1 5. Doors situated close to walls at right angles can be accommodated without special measures.
There is some variation in the pressure in cylinder chamber 28 as a function of door displacement, both during initial door closing (pressure increasing from atmospheric on rod side of piston) and when the door is subsequently opened (piston rod 1 6 entering chamber 28), but the proportions of the relevant components limit these pressures to small and acceptable vaiues.
When replaceable cartridge 5 is changed piston 1 5 is reset by simply rotating lever 30 to its fullest extent thereby forcing piston 1 5 against face 31 via rack 18 and piston rod 1 t3 causing ball 22 to be re-engaged with detent 23.
Particular features of the fast response heater and joint assembly are shown on Figure 3. A high thermal conductivity heat path having low thermal mass is provided by a thin film 32 of high thermal conductivity material, such as copper, plated onto or bonded onto anchor ring 6 (around the diameter in the vicinity of heater 8 [Figure 1] and at end face 33) which is manufactured from a relatively low thermal conductivity material such as steel or stainless steel. The low melting point alloy joint 7 is therefore made between film 32 and piston retainer 4 which is also manufactured in a low thermal conductivity material. Heater 8 (Figure 1) consisting of a thin foil or wound wire electrical element 35 wrapped round the diameter of the thin film 32 is separated from film 32 by a thin electrical insulating medium 36. Around heater element 35 is wrapped a thermal insulating ring 37. This arrangement provides sufficient surface area to permit the use of relatively low heater element temperatures together with an efficient heat transmission path and a soldered joint of minimum surface area due to the joint being loaded in pure tension. The result is a fast response time for breaking the joint with low heat power.
A further embodiment of the present invention is shown on Figure 4 in which the pressure from liquified gas container 1 is released in a manner similar to that previously described, via the low power fast response heater 8 responding to a signal derived from an external source such as a smoke sensor, temperature measurement device, pressure sensor, gas detector or process controller. The rack 39, to which is attached piston 40, drives shaft 41 via pinion 42 to operate valve 43.
Claims (1)
1. An actuating system comprising a sealed liquified gas container containing high vapour pressure gas such as carbon dioxide, a piercing member incorporating a small thin-walled tube or spike together with a piston and spring retained by a low melting point alloy soldered joint in which a low power fast response heater is provided to melt the said joint in response to an external signal, typically from a smoke sensor, causing electric current to flow to the heater thereby melting the joint and releasing the energy of the spring to cause the liquified gas container to be pierced allowing pressure to a piston in a cylinder which, operating via a transmission mechanism, is caused to close a door.
2. An actuating system, as claimed in claim 1, wherein a valve and positioning mechanism is arranged to cause a balance of pressure across the actuating piston to reduce the actuator output force when the actuating piston has been activated and is approaching completion of its first stroke, thus maintaining lower output and resisting forces for subsequent operations without a continuous bleed of gas.
3. An actuating system as claimed in claims 1 or 2, wherein heat from a low power foil or wire wound electrical heater is conducted to the face of a low melting point alloy joint via a thin high thermal conductivity film situated around the diameter of a reaction member, around which is wrapped the heater element, and leading to one side of a low melting point alloy soldered joint; the thermally conductive film being permanently joined to the reaction member by plating, bonding or similar means.
4. An actuating system as claimed in claims 1, 2 or 3, wherein the transmission between the actuating piston and output member is split to prevent movement of the output member causing movement of the actuating piston in its inoperative state but allowing the valve assembly, which permits a reduced output force to prevail after the first operation, to be reset by moving the output member to the extent of or near to its full travel.
5. An actuating system as claimed in claim 1, wherein the said actuator is caused to open or close a valve, vent, door or window in response to an external signal causing current to flow to the said low power fast response heater.
6. An actuating system substantially as described herein with reference to Figures 1-4 of the accompanying drawings.
New claims or amendments to claims filed on 16th September 1983.
Superseded claims 1.
New or amended claims:
1. An actuating system comprising a sealed liquified gas container containing high vapour pressure gas such as carbon dioxide, a piercing member incorporating a small thin-walled tube or spike together with a piston and spring retained by a low melting point alloy soldered joint in which a low power fast response heater is provided to melt the said joint in response to an external signal, typically from a smoke sensor, causing electric current to flow to the heater thereby melting the joint and releasing the energy of the spring to cause the liquified gas container to be pierced allowing pressure to a piston in a cylinder which, operating via a transmission mechanism, is caused to close a door and in which the gas remains trapped in the cylinder acting as a spring to allow the door to be re-opened and causing it to reclose.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8316084A GB2121873A (en) | 1982-06-16 | 1983-06-13 | Actuating systems for operating doors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8217368 | 1982-06-16 | ||
GB8316084A GB2121873A (en) | 1982-06-16 | 1983-06-13 | Actuating systems for operating doors |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8316084D0 GB8316084D0 (en) | 1983-07-20 |
GB2121873A true GB2121873A (en) | 1984-01-04 |
Family
ID=26283108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8316084A Withdrawn GB2121873A (en) | 1982-06-16 | 1983-06-13 | Actuating systems for operating doors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2121873A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2286631A (en) * | 1994-02-16 | 1995-08-23 | Christopher David Boisseau | Door closing device having active and passive modes |
EP0808246A1 (en) * | 1995-02-10 | 1997-11-26 | The Bilco Company | Fire rated floor door and control system |
EP1589231A2 (en) * | 2004-04-23 | 2005-10-26 | TECNOCUPOLE PANCALDI S.r.l. | Actuator particularly for smoke vents |
WO2020037760A1 (en) * | 2018-08-23 | 2020-02-27 | 沈阳东北电力调节技术有限公司 | Fireproof electro-hydraulic actuator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1113563A (en) * | 1965-06-03 | 1968-05-15 | Esser Kg Klaus | Emergency opening device for a domed skylight or the like |
-
1983
- 1983-06-13 GB GB8316084A patent/GB2121873A/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1113563A (en) * | 1965-06-03 | 1968-05-15 | Esser Kg Klaus | Emergency opening device for a domed skylight or the like |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2286631A (en) * | 1994-02-16 | 1995-08-23 | Christopher David Boisseau | Door closing device having active and passive modes |
EP0808246A1 (en) * | 1995-02-10 | 1997-11-26 | The Bilco Company | Fire rated floor door and control system |
EP0808246A4 (en) * | 1995-02-10 | 2000-12-27 | Bilco Co | Fire rated floor door and control system |
EP1589231A2 (en) * | 2004-04-23 | 2005-10-26 | TECNOCUPOLE PANCALDI S.r.l. | Actuator particularly for smoke vents |
EP1589231A3 (en) * | 2004-04-23 | 2006-01-04 | TECNOCUPOLE PANCALDI S.r.l. | Actuator particularly for smoke vents |
WO2020037760A1 (en) * | 2018-08-23 | 2020-02-27 | 沈阳东北电力调节技术有限公司 | Fireproof electro-hydraulic actuator |
Also Published As
Publication number | Publication date |
---|---|
GB8316084D0 (en) | 1983-07-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6382234B1 (en) | One shot valve for operating down-hole well working and sub-sea devices and tools | |
US5788212A (en) | Pressure relief device with shaped memory alloy thermally activated trigger | |
US4282931A (en) | Metal hydride actuation device | |
US5458202A (en) | Pressurized extinguishant release device with rolling diaphragm | |
RU2425703C2 (en) | Lock for sprinklers and nozzles with thermal disconnection | |
US20220055722A1 (en) | Shape memory alloy actuator for inflation device | |
US4394934A (en) | Fluid dispensing anti-burglar device | |
GB2121873A (en) | Actuating systems for operating doors | |
US2998018A (en) | Electro thermal valve | |
US4999615A (en) | Device for detecting the exceeding of a temperature threshold | |
CA3067266A1 (en) | Release valve with fail-safe | |
US6269830B1 (en) | Extended area thermal activation device | |
US4018361A (en) | Fluid dispensing anti-burglar device | |
US3416451A (en) | Battery activator system | |
US4244386A (en) | Valve having pyrotechnic separation device | |
US5562118A (en) | Emergency shutoff valve with a fusible link and method | |
EP0221298B1 (en) | Thermally activated trigger device | |
EP3017268B1 (en) | Fog generator | |
US3930597A (en) | Chemical dispensing anti-burglary device | |
SU820852A1 (en) | Device for automatic switching-on of fire-fighting means | |
US2764026A (en) | Thermal fuse | |
SU1057044A1 (en) | Valve for automatic fire extinguishing system | |
RU2778751C1 (en) | Sprinkler of fire extinguishing system | |
US3237179A (en) | Heat detection device with test system | |
SU1417882A1 (en) | Automatic valve for fire-fighting system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |