JP2013044195A - Lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock device which can improve fireproof performance by closing a clearance formed in a lock case in the case of fire.SOLUTION: A lock device 13 is provided with a lock case 19 which is provided in the door end of a door 15, a cylinder lock 21 which is inserted through a door hole 29 formed in the door 15 and mounted to a mounting hole 27 formed in a lock case side plate 25, and a thermal expansion refractory material which is provided between a cylinder lock outer peripheral surface 67 and the lock case side plate 25 and expanded to close a clearance 69 between the cylinder lock outer peripheral surface 67 and the mounting hole 27 when heated. The thermal expansion refractory material is formed as a belt-like winding refractory material 65, which can be wound around the cylinder lock outer peripheral surface 67 in the form of a ring so that the longitudinal direction becomes the circumferential direction of the cylinder lock outer peripheral surface 67. The thermal expansion refractory material is formed as a circular plate-like sticking refractory material, which may be stuck to the peripheral edge of the mounting hole 27 in the outer surface 75 of the lock case side plate 25.

Description

  The present invention relates to a lock device installed inside a door end of a door.

  In the case of a fire in a building such as a house, it is desirable that the door that closes the opening has high fire prevention performance. However, the door is provided with a through hole for allowing an operation member or the like provided along with the lock device to be exposed on the door surface. In this case, a gap is formed between the axis of the operation member such as the knob and the through hole of the door. In the event of a fire, the flame will pass through the gap, reducing the fire performance at the door. As a means for solving such a problem, there is a fire door structure disclosed in Patent Document 1, for example.

  The structure of the fire door includes an attachment portion provided in a through-hole formed in the door body, an escation plate that covers the attachment portion and is attached to the front and back surfaces of the door body, and projects from the escation plate. In the structure of a fireproof door provided with a lock set including a grip member provided in the above-described manner, a thermal foaming material is filled between the escation plate and the door body.

  According to the structure of this fire door, since the thermal foam material expands in volume and fills the gap in the event of a fire, the airtightness is enhanced, and flame and smoke do not pass through, thereby providing a sufficient fire spread prevention effect.

Japanese Utility Model Publication No. 7-12627

  However, if the lock device has a simple structure, it may be configured as in Patent Document 1, but in reality, the lock device is composed of a large number of parts, and supports a lot of parts for supporting the shaft and parts. A hole is drilled in the lock box. In recent years, there are many parts made of resin in the lock box, and in the case of electric locks, there are not only mechanical parts but also electric motors, and many resin members are used to house them. ing. For this reason, in the event of a fire, there is a concern that the resin melted by heat leaks and burns out from the hole, and there is a possibility of spreading fire while sandwiching the door through the door. Such resin parts are used for cost reduction instead of conventional metals, dead bolt advance / retreat sliding guide, silencing effect during advance / retreat operation, impact noise suppression effect, etc. There are various things such as what was added to.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a lock device capable of improving fire prevention performance by closing the gap of the lock box in the event of a fire.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The lock device 13 according to claim 1 of the present invention includes a lock box 19 provided in the door tip 11 of the door 15;
A cylinder lock 21 that is inserted into a door hole 29 formed in the door 15 and is attached to an attachment hole 27 formed in the lock box side plate 25;
A thermal expansion refractory material which is provided between the cylinder lock outer peripheral surface 67 and the lock box side plate 25 and expands to close the gap 69 between the cylinder lock outer peripheral surface 67 and the mounting hole 27 when heated;
It is characterized by comprising.

  In this locking device 13, the thermal expansion refractory material instantly expands in the event of a fire, forms a highly heat-insulating layer, and closes the gap 69 between the cylinder lock 21 and the lock box 19. This prevents the spread of fire from the gap 69 and the leakage of the resin melted inside the lock box 19.

The lock device 13 according to claim 2 of the present invention is the lock device 13 according to claim 1,
The thermally expanded refractory material is formed as a strip-shaped wrapping refractory material 65, and is wound around the cylinder lock outer peripheral surface 67 in an annular shape so that the longitudinal direction is the circumferential direction of the cylinder lock outer peripheral surface 67. Features.

  In this locking device 13, since the wrapping refractory material 65 is wound around the cylinder lock outer peripheral surface 67, when the wrapping refractory material 65 expands in the thickness direction due to heat from a fire, the wrapping refractory material 65 moves outward in the radial direction of the cylinder lock 21. The volume increases and reaches the mounting hole 27, and the gap 69 between the cylinder lock outer peripheral surface 67 and the mounting hole 27 is reliably filled.

The lock device 13 according to claim 3 of the present invention is the lock device 13 according to claim 1,
The thermal expansion refractory material is formed as an annular plate-shaped sticking refractory material 73 and is attached to the peripheral edge 77 of the mounting hole 27 of the lock box side plate outer surface 75.

  In this locking device 13, when the refractory material 73 to be stuck is expanded in the thickness direction due to heat from the fire, it reaches the door inner wall surface 79, enters the gap 81 between the door hole 29 and the cylinder lock outer peripheral surface 67, and is attached to the mounting hole. Also enters a gap 69 between the outer peripheral surface 27 and the cylinder lock outer surface 67.

The lock device 13 according to claim 4 of the present invention includes a lock box 19 provided inside the door 11 of the door 15;
A front member 40 provided in the lock box 19 and attached to the mouth 45 of the door 15 and having a through-hole penetrating a lock device component;
When the member through hole is formed and adhered to the inner surface 71 of the side plate 25 of the lock box side plate 25 and heated along the range of the front member 40, the member expands when the lock device constituting member and the member through hole are formed. A thermal expansion refractory material that closes the gap 69;
It is characterized by comprising.

  In this locking device 13, when the thermally expanded refractory material adhered to the side plate inner surface 71 expands in the thickness direction due to heat from a fire, the volume of the thermally expanded refractory material increases in the direction along the front member side inner surface 97. The thermally expanded refractory material having an increased volume covers the front member-side inner surface 97 so as to surround the lock device component, and the lock box 19 is filled. As a result, the gap 69 between the member through hole and the lock device constituent member passing through the member through hole is closed.

The lock device 13 according to claim 5 of the present invention is the lock device 13 according to claim 4,
The thermal expansion refractory material is adhered to the corner 93 in the lock box sandwiched between the side plate inner surface 71 and the front member side inner surface 97 as a corner refractory material 99.

  In this lock device 13, when the corner refractory material 99 is adhered to the corner 93 in the lock box, when the corner refractory material 99 expands due to heat from the fire, the corner 93 in the lock box thermally expands. For example, the gap 69 between the lock box main body 91 and the lid member 87 located at the inner corner 93 of the lock box is closed.

The lock device 13 according to claim 6 of the present invention is the lock device 13 according to claim 4 or 5,
The thermally expanded refractory material is attached to each of the side plate inner surfaces 71 on both sides sandwiching the front member 40.

  In the lock device 13, in the lock box 19, the thermally expanded refractory material whose volume has increased from the opposite side plate inner surfaces 71 expands toward the opposite side plate inner surface 71, and heat that covers the front member side inner surface 97. The filling rate of the expanded refractory material is increased, and the filling is quickly completed.

  According to the lock device of the first aspect of the present invention, in the event of a fire, the thermal expansion refractory material that expands the gap between the cylinder lock and the lock box is closed by the heat generated, thereby improving the fire prevention performance as a door. be able to.

  According to the lock device of the second aspect of the present invention, the wrapping refractory material wound around the outer peripheral surface of the cylinder lock expands radially outward due to heat at the time of the fire, and fills the gap with the mounting hole. Fireproof performance can be improved.

  According to the locking device of the third aspect of the present invention, the refractory material to be attached, which is attached to the periphery of the mounting hole, expands in the thickness direction to close the gap between the outer peripheral surface of the cylinder lock and the mounting hole, thereby preventing fire. Performance can be improved.

  According to the lock device of claim 4 according to the present invention, the thermally expandable refractory material affixed to the inner surface of the side plate of the lock box expands in the thickness direction due to heat from the fire, and the lock device component member and the member through hole By closing the gap, it is possible to prevent leakage of resin parts due to heat, and to prevent fire spread and improve fire prevention performance.

  According to the lock device according to claim 5 of the present invention, the inner corner of the lock box is covered with the corner refractory material, and the gap located in the inner corner of the lock box is reliably closed to improve the fire prevention performance. Can do.

  According to the lock device of the sixth aspect of the present invention, since the thermally expanded refractory material expands from the inner surface of the side plates on both sides toward the inside of the lock box, a large expansion volume is obtained and the fireproof performance is improved. be able to.

It is a disassembled perspective view of the locking device which concerns on this invention. (A) is a perspective view of the cylinder lock before winding the refractory material for winding, (b) is a perspective view of the cylinder lock wound with the refractory material for winding. (A) is sectional drawing of the cylinder lock penetration part before the refractory material for winding expands, (b) is sectional drawing of the cylinder lock penetration part after the refractory material for winding expands. It is a disassembled perspective view of the refractory material and cylinder lock to stick. It is sectional drawing of the cylinder lock penetration part before the refractory material to stick is expanded. It is sectional drawing of the cylinder lock penetration part after the refractory material to stick has expanded. It is a side view of the state which removed the cover member of the locking device provided with the resin member for noise reduction. It is a side view of the state which removed the cover member of the locking device provided with the electric motor. It is a plane sectional view of a lock box where a thermal expansion refractory material was stuck to the inner surface of one side plate. It is a plane cross-sectional view of a lock box in which a corner refractory material is attached to the corner of the lock box. It is a plane sectional view of a lock box in which a thermal expansion refractory material was stuck on both the inner surfaces of the facing side plates. It is a cross-sectional view of a lock box in which corner refractory materials are attached to the inner corners of two lock boxes sandwiching the front member side inner surface.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of a lock device according to the present invention.
The locking device 13 according to the first embodiment is installed inside the door tip 11 of the door 15. The lock device 13 may be a normal lock without the electric motor 17 (see FIG. 8) in addition to the electric lock shown in the figure. The lock device 13 has a lock box 19, and a cylinder lock 21 and a thumb turn 23 are attached to the lock box 19. For example, the cylinder lock 21 is attached to an attachment hole 27 formed in the lock box side plate 25. The cylinder lock 21 attached to the attachment hole 27 is exposed from the door hole 29 to the door outdoor surface 31. The exposed cylinder lock 21 is covered between the cylinder lock 21 and the door hole 29 by a substantially frustoconical decorative ring 33. A lock-side cable 35 connected to an electric motor 17 and a control device (not shown) provided inside is led out from the lock box 19. The lock-side cable 35 is connected to a door-side cable 39 led out from the back side of the lock box housing space 37 with a connector.

  A front member 40 is integrally provided on the end of the lock box 19. The front member 40 is formed in a substantially strip plate shape, and in the present embodiment, includes a front back plate 41 and a front plate 43. The front back plate 41 constitutes one side of the lock box 19, and the front plate 43 is attached to the surface of the front back plate 41 in an overlapping manner. The front back plate 41 and the front plate 43 extend from the lock box 19 at the top and bottom. The lock box 19 is inserted into the lock box housing space 37 opened at the wooden end 45 of the door 15 from the wooden end 45, and the extending portion 47 is fixed to the wooden end 45 by a fixing screw 49. That is, the front back plate 41 is covered by the front plate 43. Thereby, the lock device 13 is fixed to the door 15.

  The locking device 13 is provided with a cylinder fixing pin 51, a dead bolt 53, a front plate fixing screw 55, and a locking / unlocking mechanism (not shown) as the locking device constituent members. The front back plate 41 is provided with a dead bolt 53, a cylinder fixing pin 51, a dead bolt advancing / retracting hole 57 through which a front plate fixing screw 55 passes, a fixing pin insertion hole 59, a front plate fixing hole 61, and the like. Has been. The front plate 43 is provided with a dead bolt advance / retreat hole 57 and a front plate fixing hole 61. The cylinder fixing pin 51 and the fixing screw 49 are covered and shielded by the front plate 43.

  As described above, the cylinder lock 21 is attached to the attachment hole 27 formed in the lock box side plate 25. This attachment is fixed by inserting a plurality of cylinder fixing pins 51 from the end 45 into the fixing convex portion 63 protruding from the rear portion of the cylinder lock 21.

2A is a perspective view of the cylinder lock 21 before the winding refractory material 65 is wound, and FIG. 2B is a perspective view of the cylinder lock 21 around which the wrapping refractory material 65 is wound.
The cylinder lock 21 attached to the attachment hole 27 of the lock box side plate 25 is inserted into a door hole 29 formed in the door 15. Here, between the cylinder lock outer peripheral surface 67 and the lock box side plate 25, a wrapping refractory material 65, which is a thermal expansion refractory material, is provided. The thermally expanded refractory material expands when heated and closes the gap 69 (see FIG. 3) between the cylinder lock outer peripheral surface 67 and the mounting hole 27.

  As this thermal expansion refractory material, a butyl-based or epoxy-based refractory material formed in a substantially sheet shape, and a material that expands only in the thickness direction when heated can be suitably used. The sheet-like thermally expanded refractory material is heated and instantaneously expands 5 to 40 times in the thickness direction to form a highly heat-insulating layer. For example, when a 1.7 mm thick thermally expanded refractory material is attached to the side plate inner surface 71 (see FIG. 9), the inside of the lock box is filled with about 10 times expansion.

  In the example shown in FIG. 3, the thermally expanded refractory material is formed as a strip-shaped refractory material 65 for winding. The refractory material 65 for winding is annularly wound around the cylinder lock outer peripheral surface 67 so that the longitudinal direction is the circumferential direction of the cylinder lock outer peripheral surface 67. The winding refractory material 65 is wound on the tip side (key hole side) of the fixing portion 63 of the cylinder lock outer peripheral surface 67. The winding refractory material 65 can be attached to the cylinder lock outer peripheral surface 67 with its own adhesiveness, and can be easily attached by forming an adhesive layer on one side. It is.

Next, the operation of the lock device 13 according to the first embodiment will be described.
FIG. 3A is a cross-sectional view of the cylinder lock penetration portion before the winding refractory material 65 expands, and FIG. 3B is a cross-sectional view of the cylinder lock penetration portion after the wrapping refractory material 65 expands.
In this locking device 13, the thermal expansion refractory material instantly expands in the event of a fire, forms a highly heat-insulating layer, and closes the gap 69 between the cylinder lock 21 and the lock box 19. This prevents the spread of fire from the gap 69 and the leakage of the resin melted by the heat inside the lock box 19 due to fire. That is, since the wrapping refractory material 65 is wound around the cylinder lock outer peripheral surface 67, when the wrapping refractory material 65 expands in the thickness direction due to heat from a fire, the volume increases radially outward of the cylinder lock 21. The mounting hole 27 is reached. As a result, the gap 69 between the cylinder lock outer peripheral surface 67 and the mounting hole 27 is reliably filled. That is, the wrapping refractory material 65 wound around the cylinder lock outer peripheral surface 67 expands radially outward to fill the gap 69 between the mounting hole 27 and improve the fireproof performance. Note that the wrapping refractory material 65 also closes the gap 81 between the door hole 29 and the cylinder lock outer peripheral surface 67, and also blocks the penetrating state between the lock box housing space 37 and the outside of the door surface 31. Become.

Next, a second embodiment of the locking device 13 according to the present invention will be described.
4 is an exploded perspective view of the sticking refractory material 73 and the cylinder lock 21, FIG. 5 is a cross-sectional view of the cylinder lock penetration part before the sticking refractory material 73 expands, and FIG. 6 is after the sticking refractory material 73 is expanded. It is sectional drawing of a cylinder lock penetration part. In the following description, the same members and parts as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.
In the locking device 13 according to this embodiment, the thermal expansion refractory material is formed as an annular plate-shaped sticking refractory material 73. The refractory material 73 for sticking is formed by punching in a ring shape. Further, the refractory material 73 to be attached may be cut at one place to open the inner diameter side, and can be attached so as to be wound around the outer peripheral surface of the cylinder lock 21 at this cut. This sticking refractory material 73 is stuck to the peripheral edge 77 of the mounting hole 27 of the lock box side plate outer surface 75. In addition, in the refractory material 73 for sticking of this embodiment, the sheet material which is the above-mentioned heat expansion refractory material having a thickness of 1.7 mm is formed by stacking two sheets to have a thickness of 3.4 mm.

  In this locking device 13, when the adhesive refractory material 73 expands in the thickness direction due to heat from the fire, the expanded adhesive refractory material 73 reaches the inner wall surface 79 of the door, and further, the door hole 29 and the cylinder lock outer peripheral surface 67. Enter the gap 81. In addition, the refractory material 73 to be stuck between the door inner wall surface 79 and the lock box 19 is further expanded to enter the gap 69 between the mounting hole 27 and the cylinder lock outer peripheral surface 67. To do. That is, both the gap 81 between the door hole 29 and the cylinder lock outer peripheral surface 67 and the gap 69 between the mounting hole 27 and the cylinder lock outer peripheral surface 67 are blocked by the sticking fireproof material 73.

  Therefore, according to the lock device 13, the refractory material 73 attached to the peripheral edge 77 of the attachment hole 27 expands in the thickness direction, and the clearance 81 between the door hole 29 and the cylinder lock outer peripheral surface 67, the attachment hole 27. And the gap 69 between the cylinder lock outer peripheral surface 67 are closed by the thermally expanded refractory material, and the fireproof performance can be improved.

Next, a third embodiment of the locking device 85 according to the present invention will be described.
FIG. 7 is a side view showing a state in which the cover member of the lock device 85 provided with the sound deadening resin member 83 is removed, and FIG. 8 is a side view showing a state in which the cover member of the lock device 13 including the electric motor 17 is removed. .
The locking device 85 according to this embodiment includes a strip-shaped side plate refractory material 89 that is a thermal expansion refractory material along the range of the front member 40 in which member through holes are formed, in this embodiment, at least the front back plate 41. Is attached to the side plate inner surface 71 (see FIG. 9). The refractory material 89 for the side plate expands when heated and inserts lock device components (cylinder fixing pin 51, dead bolt 53, front plate fixing screw 55, etc.) and member through holes (dead bolt advance / retreat hole 57, fixing pin insertion). Hole 69, front plate fixing hole 61 and the like).

  In the lock device 85 shown in FIG. 7, a sound deadening resin member 83 is provided on the side plate inner surface 71. The sound deadening resin member 83 may be melted by heat at the time of a fire and flow out of the member through hole. Therefore, by adhering the refractory material 89 for the side plate along at least the range of the front back plate 41 in which the member through hole is formed, the member through hole is closed by expansion due to heat from the fire, that is, the lock device configuration The gap 69 between the member and the member through hole is closed to prevent the melted resin from flowing out of the lock box 19.

  In the electric lock type locking device 13 shown in FIG. 8, there is a range from a substantially central portion to a lower end in the vertical direction in which member through holes (dead bolt advance / retreat hole 57, fixing pin insertion hole 59, front plate fixing hole 61, etc.) exist. The side plate refractory material 89 is attached. Since the melted resin does not flow out in the upper part where the member through hole is not present, the attachment of the refractory material 89 for the side plate can be omitted.

FIG. 9 is a plan sectional view of the lock box 19 in which a thermally expanded refractory material is adhered to one side plate inner surface 71.
The side plate refractory material 89 may be attached only to one side plate inner surface 71. The lock box 19 includes a lock box body 91 and a lid member 87. In the illustrated example, a joint 95 of the lock box main body 91 and the lid member 87 is arranged at the corner 93 in the lock box on the outdoor side. When a single side plate refractory material 89 is attached, the side plate 95 is attached to the corner 93 of the lock box that can close the joint 95.

  In this locking device 13, when the side plate refractory material 89, which is a thermal expansion refractory material attached to the side plate inner surface 71, expands in the thickness direction due to heat from a fire, the side plate refractory material 89 extends in a direction along the front member side inner surface 97. The volume of increases. The refractory material 89 for the side plate having an increased volume is filled in the lock box 19 so as to cover the front member-side inner surface 97 so as to surround the lock device constituting member. As a result, the gap 69 (see FIGS. 7 and 8) between the member through hole and the lock device constituting member that passes through the member through hole is closed.

  Therefore, according to the lock device 13 according to the third embodiment, the side plate refractory material 89 affixed to the side plate inner surface 71 expands in the thickness direction due to heat, and the gap 69 between the lock device constituent member and the member through hole is formed. Thus, it is possible to prevent fire spreading from the gap 69 and leakage of the resin melted by heat inside the lock box 19, thereby improving fire prevention performance.

FIG. 10 is a plan sectional view of the lock box 19 in which the corner refractory material 99 is attached to the corner 93 in the lock box.
Further, the thermally expanded refractory material may be attached in an L shape to the corner 93 in the lock box sandwiched between the side plate inner surface 71 and the front member side inner surface 97 as the corner refractory material 99.
When the corner refractory material 99 is stuck to the corner 93 in the lock box, when the corner refractory material 99 expands due to a fire, the corner 93 in the lock box is filled with the thermally expanded refractory material.
Thereby, for example, the gap 69 formed at the joint 95 between the lock box main body 91 and the lid member 87 located at the inner corner 93 of the lock box is reliably closed, and the fireproof performance can be improved.

FIG. 11 is a plan sectional view of the lock box 19 in which a thermal expansion refractory material is adhered to both of the side plate inner surfaces 71 facing each other. FIG. 12 is a view showing a corner portion between two inner corner portions 93 sandwiching the front member side inner surface 97. It is a plane sectional view of the lock box 19 to which the refractory material 99 is stuck.
Note that the side plate refractory material 89 and the corner refractory material 99, which are thermal expansion refractory materials, may be attached so as to face the side plate inner surfaces 71 on both sides of the front back plate 41, respectively.
Inside the lock box 19, the thermally expanded refractory material having an increased volume expands from the opposing side plate inner surfaces 71 toward the opposite side plate inner surface 71, and both side plate refractory materials 89 or corner refractory materials 99. Is instantaneously filled, and the filling rate of the thermally expanded refractory material covering the front member-side inner surface 97 is increased.
Thereby, a large expansion volume can be obtained and the fireproof performance can be further improved.

  Therefore, according to the lock device 13 according to the present embodiment, in the event of a fire, the gap 69 (see FIG. 3) between the cylinder lock 21 and the lock box 19 is closed with the thermally expanded refractory material, and thereby the fire spread from the gap 69. In addition, leakage of the resin melted by heat from the fire inside the lock box 19 is prevented, and the fireproof performance in the door portion can be improved.

  In the above-described embodiment, the example of the front member 40 in which the front back plate 41 and the front plate 43 are configured separately has been described. However, the front back plate 41 and the front plate 43 are integrally configured. The same effect can be obtained with the front member 40, and the gap between the member through-hole formed in the front member 40 and the lock device component member that passes through the member through-hole is closed to improve fire prevention performance. Is possible.

  In the above embodiment, the dead bolt 53 and the latch bolt 13 are described as an example of the lock device 13 in which the bolt is advanced and retracted horizontally. However, the present invention is arranged at the upper edge portion and the lower edge portion of the door end side. Even when the dead bolt 53 and the latch bolt are used in a locking device that advances and retreats in the vertical direction, the same effect as described above can be obtained.

DESCRIPTION OF SYMBOLS 11 ... Door tip 13 ... Locking device 15 ... Door 19 ... Lock box 21 ... Cylinder lock 25 ... Lock box side plate 27 ... Mounting hole 29 ... Door hole 40 ... Front member 45 ... Wooden end 51 ... Locking device component (cylinder fixing pin)
53 ... Locking device component (dead bolt)
55. Locking device component (front plate fixing screw)
57… Member through hole (dead bolt advance / retreat hole)
59 ... Member through hole (fixing pin insertion hole)
61 ... Member through hole (front plate fixing hole)
65 ... Thermal expansion refractory (wrapping refractory)
67 ... Cylinder lock outer peripheral surface 69 ... Gap 71 ... Side plate inner surface 73 ... Thermal expansion fire-resistant material (fire-resistant material to be attached)
75 ... Outer surface of lock box side plate 77 ... Perimeter 89 ... Thermal expansion refractory material (refractory material for side plate)
93 ... Corner in the lock box 97 ... Front member side inner surface 99 ... Thermal expansion refractory material (corner refractory material)

Claims (6)

A lock box installed inside the door,
A cylinder lock that is inserted into a door hole formed in the door and attached to an attachment hole formed in the lock box side plate;
A thermal expansion refractory material which is provided between a cylinder lock outer peripheral surface and the lock box side plate and expands when heated and closes a gap between the cylinder lock outer peripheral surface and the mounting hole;
A locking device comprising: The locking device according to claim 1,
The thermal expansion refractory material is formed as a strip-shaped refractory material for winding, and is wound around the cylinder lock outer peripheral surface in an annular shape so that a longitudinal direction thereof is a circumferential direction of the cylinder lock outer peripheral surface. Locking device. The locking device according to claim 1,
The said thermal expansion refractory material is formed as an annular plate-shaped sticking refractory material, and was stuck to the periphery of the said attachment hole of the lock box side board outer surface. A lock box installed inside the door,
A front member provided in the lock box and attached to the mouth of the door and having a through-hole formed in a through-hole of the lock device component; and
Attached to the inner surface of the side plate of the lock box side plate along at least the range of the front member where the member through hole is formed, and expands when heated to close the gap between the lock device component and the member through hole. A thermal expansion refractory material;
A locking device comprising: The locking device according to claim 4,
A locking device, wherein the thermal expansion refractory material is attached in an L shape to a corner inside a lock box sandwiched between the inner surface of the side plate and the inner surface of the front member as a corner refractory material. The locking device according to claim 4 or 5, wherein
The locking device according to claim 1, wherein the thermally expanded refractory material is attached to each of the inner surfaces of the side plates on both sides of the front member.

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