Fire lock device

Abstract

A fire lock device (100) for a fire door comprises a housing (110), which comprises a first side plate (112) and a second side plate (114) connected to the first side plate, wherein a chamber (120S) and a chamber opening (120H) are formed between the first side plate and the second side plate. Furthermore, the fire lock device comprises a latch (130) arranged to the chamber pivotedly for allowing the latch to turn out from the chamber. Additionally, the fire lock device comprises a thermal fuse (140) arranged to the chamber, which thermal fuse prevents the latch from turning out of the chamber, and which thermal fuse is configured to allow for the latch to turn out of the chamber when a determined temperature is exceeded. The fire lock device further comprises a spring element (150) arranged to the chamber, which spring element is configured to bring the latch out of the chamber.

Description

Background of the invention

[0001] The invention relates to a fire lock device for a fire door. The invention relates particularly to a fire lock device for a fire door in a moving vehicle.

[0002] For fire safety, vehicles must be divided into separate fire compartments at specific intervals. Such a requirement for dividing into fire compartments exists for rail traffic carriages, such as train carriages and underground train carriages.

[0003] The structures of vehicles are optimized to be lighter. A way to optimize the structure of the vehicle to be lighter is to utilize narrow fire doors. Then, the problem is that narrow or thin fire doors open due to thermal stress more easily than wider or thicker fire doors. Furthermore, a narrow fire door causes limitations to the fire lock device and its durability. Additionally, problems in the vehicle are imposed by loads applied to the vehicle, such as e.g. loads caused by vibration and loads caused by change in speed. In all these situations, the structure must be reliable for the compartmentalization.

[0004] For example, specification FR2979370A1 describes a fire lock device. Document US 2005 / 284030 A1 discloses a fire retardant panel door and a door frame having intumescent materials therein.Brief description of the invention

[0005] It is an object of the present invention to provide a new type of a fire lock device for a fire door. The solution according to the invention is characterized by what is disclosed in the independent claim. Some embodiments of the invention are presented in the dependent claims.

[0006] In the presented solution, the fire lock device for a fire door comprises a housing, which comprises a first side plate and a second side plate connected to the first side plate, wherein a chamber and a chamber opening are formed between the first side plate and the second side plate. Further, the fire lock device comprises a latch arranged to the chamber pivotedly for allowing the latch to turn out from the chamber. Further, the fire lock device comprises a thermal fuse arranged to the chamber, which thermal fuse prevents the latch from turning out of the chamber, and which thermal fuse is configured to allow for the latch to turn out of the chamber when a determined temperature is exceeded. The fire lock device further comprises a spring element arranged to the chamber, which spring element is configured to bring the latch out of the chamber. In the presented solution, the fire lock device simultaneously allows for a narrow, durable, dependable, reliable, and loadresistant structure for a fire door.

[0007] According to an embodiment, the housing comprises a middle plate connected between the first side plate and the second side plate. This type of solution is structurally strong and simple to manufacture.

[0008] According to an embodiment, the inner flank surface of the middle plate extends at a distance of 0-5 mm from the spring element and the latch. Such a solution is structurally extremely durable.

[0009] According to an embodiment, the chamber is formed in an area between the first side surface of the first side plate, the first side surface of the second side plate and the inner flank surface of the middle plate. Such a solution is simple to manufacture.

[0010] The latch is a hook shaped plate, a first side surface of which is against the first side surface of the first side plate and a second side surface of which is against the first side surface of the second side plate. This type of solution supports the fire lock device and the latch constructionally and in order to endure loads applied to it.

[0011] According to an embodiment, an opening extends through the housing, and the thermal fuse is arranged to said opening. Such a solution enables the heat caused by the fire to convey to the thermal fuse as effectively as possible.

[0012] According to an embodiment, the thermal fuse extends on the two opposite outer sides of the housing. Such a solution enables the heat caused by the fire to convey to the thermal fuse as effectively as possible.

[0013] According to an embodiment, the thermal fuse is arranged to the chamber at a determined distance from the chamber opening. This type of solution prevents possible vandalism directed at e.g. the thermal fuse.

[0014] According to an embodiment, the spring element is a torsion spring. This type of solution enables e.g. a housing structure as narrow as possible.

[0015] According to an embodiment, a fastening element is arranged to the chamber and the torsion spring surrounds the fastening element. In such a solution, one fastening element is sufficient to keep the torsion spring in the chamber, the torsion spring still being reliable.

[0016] According to an embodiment, the volume of the latch arranged to the chamber is more than 50% in relation to the volume of the chamber. This type of solution constitutes a rigid structure for the fire lock device.Brief description of the drawings

[0017] The invention will now be described in closer detail in connection with some embodiments and with reference to the accompanying drawings, wherein Figure 1 is a schematic diagonal front view of a fire lock device, Figure 2 is a schematic diagonal front view of the fire lock device of Figure 1, with its latch turned out of a chamber of the device, Figure 3 is a schematic front view of the fire lock device of Figure 1, Figure 4 is a schematic side view of the fire lock device of Figure 1 without its first side plate, Figure 5 is a schematic side view of the fire lock device of Figure 1 without its first side plate, wherein the latch is turned out of the chamber of the device, Figure 6 is a schematic side view of the fire lock device of Figure 1 without its first side plate, wherein the fire lock device is arranged to a fire door, Figure 7 is a schematic front view of the fire lock device of Figure 1, wherein the fire lock device is arranged to a fire door, and Figure 8 is a schematic view of the fire lock device of Figure 1, wherein the latch further has a holding portion for preventing a sliding movement between the latch and its counterpart. Detailed description of the invention

[0018] Figure 1 is a schematic diagonal front view of a fire lock device 100. Figure 2 is a schematic diagonal front view of the fire lock device 100 of Figure 1, with its latch 130 turned out of a chamber 120S. Figure 3 is a schematic front view of the fire lock device 100 of Figure 1. Figure 4 is a schematic side view of the fire lock device 100 of Figure 1 without its first side plate 112. Figure 5 is a schematic side view of the fire lock device 100 of Figure 1 without its first side plate 112, wherein the latch is turned out of the chamber of the device.

[0019] The fire door is intended to be openable in normal use situations. Furthermore, the fire door is intended to resist stresses applied to it, such as e.g. heat loads caused by the fire and distortions due to them. The fire lock device 100 is configured installable to a fire door, such as a fire door of a carriage in rail traffic, wherein the latch of the fire lock device 100 is configured to match a structure adjacent to the fire door, such as e.g. the frame of the carriage in rail traffic or e.g. an adjacent fire door or e.g. the framework of a fire door. The fire door and the fire lock device 100 thereon constitute, when connected to an equivalent / adjacent structure, a structure resistant to stresses thus preventing the fire door from opening or warping for a determined time e.g. in a fire situation.

[0020] The fire lock device 100 of the figures for a fire door comprises a housing 110, which comprises a first side plate 112 and a second side plate 114 connected to the first side plate, wherein a chamber 120S and a chamber opening 120H are formed between the first side plate 112 and the second side plate 114. Furthermore, the fire lock device 100 comprises a latch 130 arranged to the chamber 120S pivotedly for allowing the latch to turn out from the chamber. Additionally, the fire lock device 100 comprises a thermal fuse 140 arranged to the chamber 120S, which thermal fuse 140 prevents the latch 130 from turning out of the chamber 120S, and which thermal fuse 120S is configured to allow for the 130 latch to turn out of the chamber 120S when a determined temperature is exceeded. The fire lock device 100 further comprises a spring element 150 arranged to the chamber 120S, which spring element 150 is configured to bring the latch 130 out of the chamber 120S.

[0021] The housing 110 of the fire lock device 100 of the figures comprises a first side plate 112 and a second side plate 114 connected to the first side plate 112, wherein a chamber 120S and an opening 120H of the chamber 120S are formed between the first side plate 112 and the second side plate 114. The material of said plates can be e.g. steel. A width 110W of the housing 110 can be e.g. 4-10 mm, or e.g. 4-8 mm, or e.g. 4-6 mm, or e.g. about 5 mm. Depending on the width 110W of the housing 110, a width 120S-W of the chamber 120S can be e.g. 1-7 mm, or e.g. 1-5 mm, or e.g. 1-3 mm, or e.g. about 1-2 mm. The first side plate 112 and the second side plate 114 are sheet metal blanks cut to shape.

[0022] The first side plate 112 has a first side surface 112-S1 and a second side surface 112-S2 located on its opposite side. A gap between the first side surface 112-S1 and the second side surface 112-S2 of the first side plate 112 constitutes the first side plate 112 its thickness and flank surfaces 112-S3 between the side surfaces. The second side plate 114 has a first side surface 114-S1 and a second side surface 114-S2 located on its opposite side. A gap between the first side surface 114-S1 and the second side surface 114-S2 of the second side plate 114 constitutes the second side plate 114 its thickness and flank surfaces 114-S3 between the side surfaces. The first side surface 112-S1 of the first side plate 112 and the first side surface 114-S1 of the second side plate 114 are aligned towards each other. A gap between the first side surface 112-S1 of the first side plate 112 and the first side surface 114-S1 of the second side plate 114 constitutes said chamber 120S. The second side surface 112-S1 of the first side plate 112 and the second side surface 114-S1 of the second side plate 114 constitute the outer sides of the housing.

[0023] The middle plate 116 of the housing 110 of the figures has a first side surface 116-S1 and a second side surface 116-S2 located on its opposite side. A gap between the first side surface 116-S1 and the second side surface 116-S2 of the middle plate 116 constitutes the second side plate 116 its thickness and flank surfaces 116-S3 between the side surfaces. The middle plate 116 includes inner flank surfaces 116-S4 aligned to the chamber 120S. It should be mentioned for clarity that a part of said flank surfaces 116-S3 are said inner flank surfaces 116-S4.

[0024] The chamber 120S of the figures is formed as follows. Between the first side plate 112 and the second side plate 114 is arranged the middle plate 116 which constitutes a determined distance between the first side plate 112 and the second side plate 114 and thus the width 120S-W of said chamber 120S. In more detail, the middle plate 116 constitutes a determined distance between the first side surface 112-S1 of the first side plate 112 and the first side surface 114-S1 of the second side plate 114, which distance is the width 120S-W of the chamber 120S. A part of the first side surface 112-S1 of the first side plate 112, a part of the firstside surface 114-S1 of the second side plate 114 and the inner flank surfaces 116-S4 of the middle plate 116 form inner surfaces for the chamber 120S and the opening 120H of the chamber 120S. Therefore, there is an access to the chamber 120S through the opening 120H.

[0025] The middle plate 116 of the housing 110 of the figures includes a protrusion 116P which, for safety reasons, covers the gap located between the latch 130 and the inner flank surface 116-S4 of the middle plate 116. Said protrusion 116P is located at the opening 120H of the chamber 120S. Then, it is not possible to e.g. place anything that would prevent the latch 130 from turning out of the chamber 120S to said gap.

[0026] In an alternative embodiment, the middle plate 116 is not used, but the first side plate 112 is arranged against the second side plate 114. In more detail, the first side surface 112-S1 of the first side plate 112 and the first side surface 114-S1 of the second side plate 114 are arranged against each other. Furthermore, to the first side surface 112-S1 of the first side plate and / or the first side surface 114-S1 of the second side plate 114 is arranged a recess / cavity which constitutes said chamber 120S, the inner surfaces of the chamber 120S and the opening 120H of the chamber 120S.

[0027] For forming a structure as rigid as possible, the chamber 120S of the housing 110 of the file lock device 100 is shaped such that the inner surfaces of the chamber 120S extend close to the spring element 150 and the latch 130. Said shaping provides an area as large as possible between the first side surface 112-S1 of the first side plate 112 and the first side surface 116-S1 of the middle plate 116, and further between the second side surface 116-S2 of the middle plate 116 and the first side surface 114-S1 of the second side plate 114. The inner flank surface 116-S4 of the middle plate 116 extends at a distance of 0-5 mm from the latch 130 and the spring element 150. The inner flank surface 116-S4 of the middle plate 116 can extend at a distance of e.g. 0-3 mm from the latch 130 and the spring element 150, or at a distance of e.g. 0-1 mm from the latch 130 and the spring element 150. The volume of the latch 130 arranged to the chamber 120S is e.g. more than 50% in relation to the volume of the chamber 120S. The volume of the latch 130 arranged to the chamber 120S is e.g. more than 60%. or e.g. more than 70%, or e.g. more than 80%, in relation to the volume of the chamber 120S. The above-mentioned arrangements assist in forming a structure as rigid as possible for the fire lock device 100 and the housing 110 and / or latch 130 thereon to endure stresses directed at the fire lock device.

[0028] The first side plate 112 and the second side plate 114 of the housing 110 of the fire lock device 100 can be connected to each other with various fastening elements 170, such as e.g. a screw joint, a pivot joint or a cotter bolt joint. The housing 110 of the fire lock device 100 of the figures comprises openings, in which, fastening elements 170 are arranged for connecting the first side plate 112 and the second side plate 114 to each other. In more detail, the first side plate 112, the second side plate 114 and the middle plate 116 comprise openings, into which, fastening elements 170 are arranged for connecting the first side plate 112, the second side plate 114 and the middle plate 116 to each other. Said connection assists in forming the rigid structure. Said connection enables the reassembly of the fire lock device 100. Alternatively, or additionally, said side plates can be connected to each other by e.g. glue, soldering, riveting, or welding.

[0029] The latch 130 of the fire lock device of the figures is arranged to the chamber 120S pivotedly (in a pivoted manner) which allows for the latch 130 to turn out of the chamber 120S. The latch 130 is a hook shaped plate or, in other words, a sheet blank of the hook shape. The latch 130 is pivotedly fastened to the housing 110 or, in more detail, the latch 130 is pivotedly fastened to the first side plate 112 and the second side plate 114. The housing 110 and the latch 130 comprise an opening corresponding to each other and a pivot 132 arranged to the opening for arranging pivoting. The pivoting thus forms for the latch 130 a pivot point around which the latch 130 is configured to turn. Furthermore, said pivoting secures the fist side plate 112 and the second side plate 114 to each other by means of the pivot and thus makes the structure of the housing 110 more rigid.

[0030] The latch 130 of the fire lock device 100 comprises a first side surface 130-S1 and a second side surface 130-S2 located on its opposite side. The first side surface 130-S1 of the latch 130 is arranged against the first side surface 112-S1 of the first side plate 112, and the second side surface 130-S2 of the latch 130 is arranged against the first side surface 114-S1 of the second side plate 114. Hence, the width of the latch 130 equals the width 120S-W of the chamber 120S. It should be mentioned for clarity that, between the latch 130 and the chamber 120S, there is such a clearance that the latch 130 can turn out of the chamber 120S. Said arrangement prevents the lateral movement of the latch 130 in the chamber 120S. Furthermore, said arrangement forms support on the side surfaces of the latch 130 when the latch is turned out of the chamber 120S, which helps the latch 130 to endure stresses directed at it. In addition, said arrangement prevents the latch 130 from vibrating in the chamber 120S where vibration might wear down connections, such as e.g. the latch 130 and the pivot joint arranged to the latch, wherein vibration can occur particularly when the rail traffic carriages operate.

[0031] The thermal fuse 140 of the fire lock device 100 of the figures is arranged to the chamber 120S. The thermal fuse 140 prevents the latch 130 from turning out of the chamber 120S. The thermal fuse 140 is located in an area between the latch 130 and the opening 120H of the chamber 120S thus preventing the latch 130 from turning out of the chamber 120S. The thermal fuse 140 is fast against the first side plate 112 and / or the second side plate 114. That is, the thermal fuse 140 forms a physical obstacle which hinders the turning of the latch 130 out of the chamber 120S. The thermal fuse 140 is dimensioned such that it endures the force applied to the latch 130 via the spring element 150 and conveyed further to the thermal fuse 140, and hence prevents the spring element 150 to get to its first position 150-A where the spring element 150 will be described in more detail below. Additionally, the thermal fuse 140 is configured to allow for the turning of the latch 130 out of the chamber 120S when a determined temperature is exceeded. The thermal fuse 140 allows for the latch 130 to turn out of the chamber 120S e.g. such that the thermal fuse 140 is configured to melt or vaporize at a specific temperature and, thus, as a determined temperature has been exceeded, to allow for the latch 130 to turn out of the chamber 120S. The thermal fuse 140 can be made of e.g. plastic or adhesive with the melting point e.g. within the range of 40-150°C, or e.g. 40-100°C, or e.g. 50-90°C, or e.g. 60-90°C. It should be mentioned for clarity that there is no need for the thermal fuse 140 to melt / vaporize completely in order for the spring element 150 to brings the latch 130 out of the chamber.

[0032] Furthermore, there is arranged an opening through the housing 110, to which opening the thermal fuse 140 is arranged. In more detail, there are holes arranged to the first side plate 112 and the second side plate 114 that correspond to each other and through which the thermal fuse 140 is arranged. The thermal fuse 140 extends on two opposite outer sides of the housing 110 or, in more detail, until the second side surface 112-S2 of the first side plate 112 and until the second side surface 114-S2 of the second side plate 114. Because the thermal fuse 140 extends on two opposite outer sides of the housing 110, heat load is conveyed via the fire door directly to the thermal fuse 140, which helps the thermal fuse 140 to operate as intended.

[0033] In addition, the thermal fuse 140 of the figures is arranged to the chamber 120S at a determined distance from the opening 120H of the chamber 120S. The thermal fuse 140 can be at the distance of e.g. about 5-20 mm from the opening 120H of the chamber 120S, or at the distance of e.g. about 10-20 mm from the opening 120H of the chamber 120S. Therefore, there is no easy access to the thermal fuse 140 through the opening 120H of the chamber 120S.

[0034] According to an embodiment, there is arranged an opening through the housing 110 and the latch 130, to which opening the thermal fuse 140 is arranged. In more detail, there are openings arranged to the first side plate 112, the second side plate 114 and the latch 130 that correspond to each other and through which the thermal fuse 140 is arranged.

[0035] According to an embodiment, an opening is arranged through the latch 130 and, further, an opening is arranged through the first side plate 112 or the second side plate 114 of the housing 110, wherein the opening of the first side plate 112 or the second side plate 114 corresponds to the opening arranged to the latch 130. The thermal fuse 140 is arranged to said openings.

[0036] According to an embodiment, an opening is arranged through the first side plate 112 or the second side plate 114 of the housing 110. The thermal fuse 140 is arranged through said opening which further extends to the chamber 120S to an area between the latch 130 and the opening 120H of the chamber 120S.

[0037] The spring element 150 of the fire lock device of the figures is arranged to the chamber 120S. The spring element 150 is configured to bring the latch 130 out of the chamber 120S. The spring element 150 comprises a first protrusion 150-1 and a second protrusion 150-2. Said first protrusion 150-1 and second protrusion 150-2 are connected to each other with a torsion element 150-3 arranged between them.

[0038] Furthermore, the spring element 150 of the figures has a first position 150-A which is an equilibrium position / location of the spring element 150. In the first position 150-A, the first protrusion 150-1 and the second protrusion 150-2 are at a determined angle in relation to each other or, in other words, at a determined distance in relation to each other. The spring element 150 additionally has a second position 150-B i.e. a deflected position / location, wherein the first protrusion 150-1 and the second protrusion 150-2 are arranged at a deflective angle in relation to the angle formed in the first position 150-A or, in other words, at a deflecting distance in relation to the distance formed in the first position 150-A. The torsion element 150-3 is configured to bring the spring element 150 from the second position 150-B to the first position 150-A.

[0039] The first protrusion 150-1 and the second protrusion 150-2 of the spring element 150 of the figures is configured to turn around the torsion element 150-3. The torsion element 150-3 has a central axis, in relation to which, the first protrusion 150-1 and / or the second protrusion 150-2 is configured to turn. The torsion element 150-3 comprises an opening in the middle. The torsion element 150-3 is e.g. a profile brought to the shape of e.g. a spiral, which forms the torsion element 150-3 a determined rigidity / spring rate for bringing the spring element 150 to its first position 150-A. The central axis of the profile brought to the shape of a spiral can be located in the middle of the spiral. The cross-section of the profile can be e.g. circular, square, rectangular, oval or elliptic. Preferably, said cross-section is circular.

[0040] The spring element 150 of the figures is a torsion spring formed of steel wire. The first protrusion 150-1 of the torsion spring is the first unthreaded portion of the steel wire. The second protrusion 150-2 of the torsion spring is the second unthreaded portion of the steel wire. The torsion element 150-3 is located between the first unthreaded portion and the second unthreaded portion, wherein the torsion element 150-3 is a portion of steel wire brought to the shape of a helix / spiral, in the middle of which is formed an opening. In the first position 150-A of the torsion spring, the first protrusion 150-1 and the second protrusion 150-2 are at the angle of e.g. about 70-100 degrees or at the angle of e.g. about 90 degrees in relation to each other. In the second position 150-B of the torsion spring, the first protrusion 150-1 and the second protrusion 150-2 are at the angle of about 0-10 degrees or at the angle of e.g. about 0 degrees in relation to each other.

[0041] The spring element 150 of the figures, such as e-g- a torsion spring, is located to the chamber 120S as follows. The central axis of the torsion element 150-3 is located / aligned towards the first side plate 112 and the second side plate 114 of the housing 110, whereby the diameter of the spiral of the torsion element 150-3 can be dimensioned suitable, maintaining the determined width 120S-W of the chamber 120S. The capability of the spring element 150 or the torsion element 150-3 thereon for producing a force to return the first position 150-A are affected by e.g. the profile material, the profile shape, the profile thickness, the number of spiral loops, and the spiral diameter of the spring element 150. The capability of the torsion spring for producing a force to return the first position 150-A are affected by e.g. the material of the steel wire, the thickness of the steel wire, the number of loops of the helix / spiral, and the diameter of the formed helix / spiral.

[0042] The spring element 150 of the figures is connected to the chamber as follows. A fastening element 152, which is surrounded by the spring element 150, is arranged to the chamber 120S. The fastening element 152 allows for the rotation of the spring element 150 in relation to the fastening element 152. The fastening element 152 is connected to the first side plate 112 and / or the second side plate 114 e.g. such that an opening is arranged to the housing 110 of the fire lock device 100, to which opening, the fastening element 152, such as e.g. a pivot, is arranged. In more detail, an opening is arranged through the first side plate 112 and the second side plate 114, and the fastening element 152, such as e.g. a pivot, is arranged to the opening. The torsion element 150-3 of the spring element 150 is located in the chamber 120S such that the torsion element 150-3 surrounds the fastening element 152. When the spring element 150 is a torsion spring, the torsion spring surrounds the fastening element 152. In more detail, the portion of the steel wire brought to the shape of a helix / spiral in the torsion spring surrounds the fastening element 152.

[0043] Furthermore, the first protrusion 150-1 of the spring element 150 of the figures is arranged against the latch 130. Said first protrusion 150-1 turns towards the opening 120H of the chamber 120S for pushing the latch 130 out of the chamber 120S. The first protrusion 150-1 is thus configured to slide along the latch 130 when the first protrusion 150-1 brings the latch 130 out of the chamber 120S. Additionally, or in an alternative embodiment, the first protrusion 150-1 of the spring element 150 can be connected to the latch 130 with a fastening element, such as e.g. adhesive or screw. In another alternative embodiment, the first protrusion 150-1 can be connected to the latch 130 indirectly.

[0044] Furthermore, the spring element 150 of the figures is connected to the chamber 120S such that the second protrusion 150-2 of the spring element 150 is arranged to a recess 118 located in the chamber 120S of the housing 110. The middle plate 116 of the housing 110 comprises the recess 118 where the second protrusion 150-2 is arranged. Additionally, or in an alternative embodiment, the second protrusion 150-2 of the spring element 150 is connected to the chamber 120S with a fastening element, such as e.g. adhesive or screw. In a further alternative embodiment, the second protrusion 150-2 of the spring element 150 is not connected to the chamber 120S.

[0045] It is possible to arrange a fitting ring between the fastening element 152 and the torsion element 150-3, which fitting ring e.g. decreases vibrations and / or which e.g. aligns the spring element 150 of the torsion spring in relation to the pivot 152.

[0046] In an embodiment, the spring element 150 comprises the torsion element 150-3 fastened to the chamber. In more detail, the torsion element 150-3 is fastened to the middle plate 116. Furthermore, the spring element comprises the first protrusion 150-1 connected to the torsion element 150-3, which first protrusion 150-1 is configured to turn around the torsion element 150-3 for bringing the latch 130 out of the chamber 120S. The torsion element can be e.g. a spring to which the first protrusion 150-1 is connected, or the torsion element can be e.g. a part of the first protrusion 150-1.

[0047] In an embodiment, the spring element 150 is formed such that the spring element 150 is integrated to the middle plate 116. The middle plate 116 comprises the first protrusion 150-1 which is configured to deflect towards the opening 120H of the chamber 120S for bringing the latch 130 out of the chamber 120S. The first protrusion 150-1 turns around a specific point in the middle plate 116, wherein the specific point then operates as the torsion element 150-3. In the first position 150-A of the spring element 150, the first protrusion 150-1 formed of the middle plate 116 is aligned towards the opening 120H of the chamber 120S and, in the second position 150-B of the spring element 150, the first protrusion 150-1 formed of the middle plate 116 is deflected from its first position 150-A where the internal stresses of the middle plate 116 are configured to return the spring element 150 to its first position 150-A.

[0048] Figure 6 is a schematic side view of the fire lock device 100 of Figure 1 without its first side plate 112, wherein the fire lock device 100 is arranged to a fire door 10. Figure 7 is a schematic front view of the fire lock device 100 of Figure 1, wherein the fire lock device 100 is arranged to a fire door 10. Figures 6 and 7 are schematic and partial views of the fire door 10 and an aluminium profile 11 thereon.

[0049] The fire lock device 100 of the figures comprises a fastening structure 180 for locking the fire lock device 100 to the fire door 10. The fastening structure 180 is a protrusion of a specific shape parallel with the flank surface 112-S3 of the first side plate 112, the flank surface 114-S3 of the second side plate 114 and / or the flank surface 116-S3 of the middle plate 116. It is possible to install a fastening element to the fire door, such as a lock plate or screw, which, when fastened to the fire door, sets in front of said fastening structure 180 and which thus locks the fire lock device 100 to the fire door.

[0050] In Figures 6 and 7, the fire lock device 100 is arranged to the fire door 10. In more detail, the fire lock device 100 is arranged to the aluminium profile 11 of the fire door 10, which profile includes a tappet / protrusion. A tappet width 11W of the aluminium profile 11 can be e.g. 9-10 mm. To said tappet is arranged a recess with the width of e.g. about 5 mm, wherein the fire lock device 100 is arranged. Said tappet recess can comprise e.g. threaded holes arranged to it for arranging the fire lock device to it by screws. The width 110W of the housing 110 of the fire lock device 100 is then about 5 mm, whereby the width 120S-W of the chamber 120S is e.g. about 2-3 mm and the width of the latch 130 equals the width 120S-W of the chamber 120S. A width of the spring element 150, such as e.g. a torsion spring, which width refer to the width of the spring element 150 in the direction of the central axis of the torsion element 150-3, is then e.g. about 1.0-3.0 mm or e.g. about 1.5-2.0 mm or e.g. about 1.5 mm.

[0051] The fire lock device 100 of the figures can be assembled e.g. as follows. The first side plate 112, the second side plate 114 and the middle plate 116 are positioned and connected to each other. Alternatively, it is possible to install the second side plate 114 in place lastly. The latch 130 is installed to the chamber 120S. The spring element 150 is installed to the chamber 120S. The spring element 150 is brought to its second position 150-B i.e. its deflected position, and the latch 130 is set against the first protrusion 150-1 of the spring element 150 e.g. directly or indirectly. The thermal fuse 140 is installed to the chamber. It is possible to ensure that the thermal fuse 140 remains in the opening during transport e.g. by installing tapes on the outer side of the housings, and the tapes can be removed before installing the fire lock device 100 to the fire door.

[0052] Figure 8 illustrates schematically the fire block device 100 as in Figure 1, with its latch 130 turned out of a chamber of the device, wherein the latch 130 of the fire block device 100 further has a holding portion 800 for preventing a sliding movement between the latch 130 and its counterpart. In other words, the latch 130 of the fire block device 100 has a holding portion 800 for providing a grip contact between the latch 130 and its counterpart. For sake of the clarity, said sliding movement is prevented when the latch 130 has turned out from the chamber 120S and when the latch 130 is in contact with its counterpart. The holding portion 800 is configured to prevent a sliding movement between the latch 130 and its counterpart. The holding portion 800 has serrated edges 802 in order to prevent said sliding movement. In other words, the holding portion 800 has serrated edges 802 in order to provide said grip contact. Said serrated edges locates between the first side face 130-S1 and the second side face 130-S2. Said serrated edges are configured to locate towards the counterpart. Said serrated edges may be arranged towards the pin 132 around which the latch 130 is configured to turn. Said counterpart may be a chamber locating adjacent relative to the fire block device 100, which chamber is arranged to a wall structure locating close said fire block device 100, or which chamber is arranged to a second fire door, for example.

[0053] Those skilled in the art will find it obvious that, as technology advances, the basic idea of the invention may be implemented in many different ways. The invention and its embodiments are thus not restricted to the above-described examples but may vary within the scope of the invention, which is defined by the appended claims.

Claims

1. A fire lock device (100) for a fire door, which fire lock device (100) comprises a housing (110) which comprises a first side plate (112) and a second side plate (114) connected to the first side plate (112), wherein a chamber (120S) and an opening (120H) of the chamber (120S) are formed between the first side plate (112) and the second side plate (114), a latch (130) arranged to the chamber (120S) pivotedly for allowing the latch (130) to turn out from the chamber (120S), a thermal fuse (140) arranged to the chamber (120S), which thermal fuse (140) prevents the latch (130) from turning out of the chamber (120S), and which thermal fuse (140) is configured to allow for the latch (130) to turn out of the chamber (120S) when a determined temperature is exceeded, and a spring element (150) arranged to the chamber (120S), which spring element (150) is configured to bring the latch (130) out of the chamber (120S), wherein the latch (130) is a hook shaped plate the first side surface (130-S1) of which is against the first side surface (112-S1) of the first side plate (112), and the second side surface (130-S2) of which is against the first side surface (114-S1) of the second side plate (114).

2. A fire lock device (100) according to claim 1, characterised in that the housing (110) comprises a middle plate (116) connected between the first side plate (112) and the second side plate (114).

3. A fire lock device (100) according to claim 2, characterised in that an inner flank surface (116-S4) of the middle plate (116) extends at the distance of 0-5 mm from the spring element (150) and the latch (130).

4. A fire lock device (100) according to claim 2 or 3, character- ised in that the chamber (120S) is formed in an area between a first side surface (112-S1) of the first side plate (112), the first side surface (114-S1) of the second side plate (114) and the inner flank surface (116-S4) of the middle plate (116).

5. A fire lock device (100) according to any one of the preceding claims, characterised in that an opening extends through the housing (110) and that a thermal fuse (140) is arranged to said opening.

6. A fire lock device (100) according to claim 5, characterised in that the thermal fuse (140) extends to two opposite outer sides of the housing (110).

7. A fire lock device (100) according to any one of the preceding claims, characterised in that the thermal fuse (140) is arranged to the chamber (120S) at a determined distance from the opening (120H) of the chamber (120S).

8. A fire lock device (100) according to any one of the preceding claims, characterised in that the spring element (150) is a torsion spring.

9. A fire lock device (100) according to claim 8, characterised in that a fastening element (152) is arranged to the chamber (120S) and that the torsion spring surrounds the fastening element (152).

10. A fire lock device (100) according to claim 8 or 9, character- ised in that the torsion spring is formed of steel wire which forms a first protrusion (150-1), a second protrusion (150-2) and a torsion element (150-3) brought to a spiral between them, whereby the first protrusion (150-1) and the second protrusion (150-2) are configured to turn around the spiral for bringing the latch out of the chamber (120S).

11. A fire lock device (100) according to any one of claims 8-10, characterised in that the width of the spring element (150) is 1.0-3.0 mm.

12. A fire lock device (100) according to any one of the preceding claims, characterised in that the volume of the latch (130) arranged to the chamber (120S) is more than 50% in relation to the volume of the chamber (120S).

13. A fire lock device (100) according to any one of the preceding claims, characterised in that the fire lock device (100) is arranged to a fire door (10).

14. A fire lock device (100) according to claim 13, character- ised in that the fire lock device (100) is arranged to an aluminium profile (11) of the fire door (10).

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