Key storage device

Abstract

The invention provides a key storage device which can reliably perform locking without causing misoperation of a locking mechanism. A locking mechanism (2) serving as a cover body (12) is provided with: a latch (21) which is locked to a housing main body (11) by being biased in the protruding direction by a spring (21a) provided to the cover body (12); a latch operation piece (22) that is provided to the housing main body (11) and retreats the latch (21); an electric actuation mechanism (23) that actuates the latch operation piece (22); and a control means (24) for the electric operation means (23).

Description

TECHNICAL FIELD

[0001] The present application relates to a key storage device constituted by a case in which a key storage space in which a key for locking and unlocking a door body is stored is formed inside. BACKGROUND

[0002] In addition, for example, in a rental property in which a room is vacant, a manager thereof stores a key for locking and unlocking a door body of an entrance of the rental property, and in the case where an inside of the rental property is viewed, the manager must be present.

[0003] However, there is a problem that, when the key is taken out from the storage place in order to view the inside of the rental property, it is difficult to view the same rental property even if another person wishes to view the inside, since the storage place does not have the key.

[0004] In addition, the manner in which the manager stores the key in a prescribed storage place has a problem that a plurality of persons, for example, a plurality of engineering workers, cannot individually access the key.

[0005] In order to cope with the above problems, a key storage device in which a key storage body in which a key for locking and unlocking a door body is stored is installed in a building or a door body via a mounting member has been proposed and put into practical use (for example, refer to Patent Documents 1 to 2).

[0006] Furthermore, in the locking mechanism of the key storage body itself of such a key storage device, a dial lock used in the key storage device disclosed in Patent Document 1, or a key-using locking mechanism used in the key storage device disclosed in Patent Document 2 is used, but in recent years, a key storage device using a mobile terminal such as a smartphone has been proposed (for example, refer to Patent Documents 3 to 4).

[0007] PRIOR ART DOCUMENTS

[0008] PATENT DOCUMENTS

[0009] Patent Document 1: Japanese Utility Model Registration No. 3138550

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2004-11145

[0011] Patent Document 3: Japanese Patent Application Laid-Open No. 2017-502185

[0012] Patent Document 4: Japanese Patent Application Laid-Open No. 2018-44312 SUMMARY

[0013] PROBLEMS TO BE SOLVED BY THE INVENTION

[0014] Furthermore, in the locking mechanism of the key storage unit of the key storage device, when using a locking mechanism of a mobile terminal such as a smartphone, a limit switch or similar device is used to detect whether the door of the open key storage unit has been closed, and the locking mechanism is locked.

[0015] However, the following problems exist: there is a time delay from the time the door of the open key storage is closed until the locking mechanism is locked. If the door is opened during this period, the locking mechanism may malfunction and stop working.

[0016] This invention was made in view of the problems existing in the locking mechanism of the key storage body of the above-mentioned key storage device, and the purpose is to provide a key storage device that can reliably lock without causing malfunction of the locking mechanism.

[0017] Methods for solving problems

[0018] To achieve the above objectives, the key storage device of the present invention comprises a housing having an internal key storage space for storing keys used to lock and unlock doors. The key storage device is characterized in that the housing rotatably supports a cover on a housing body. The locking mechanism for the cover includes: a latch, which is engaged with the housing body by a spring located on the cover in a protruding direction; a latch operating plate located on the housing body to retract the latch; an electric actuation mechanism to actuate the latch operating plate; and a control mechanism for the electric actuation mechanism.

[0019] In this case, the electric actuation mechanism that actuates the latching plate may be equipped with a servo motor or a solenoid.

[0020] Alternatively, the control mechanism of the electric actuation mechanism may include a wireless communication unit to receive authentication signals from a mobile terminal via wireless communication.

[0021] Alternatively, the power source for the control mechanism of the electric actuation mechanism can be a primary or secondary battery disposed within the housing and a 9V square dry cell battery connected to a battery snap fastener of a 9V square dry cell battery disposed exposed in the housing.

[0022] Alternatively, the control mechanism of the electric actuator may include a start switch.

[0023] Alternatively, a key storage space can be formed in the cover, and the cover portion covering the lower part of the key storage space can be made to swing and be spring-loaded toward the housing body on its upper side.

[0024] Further, the key storage device can include a key storage space formed in the cover, and a protrusion having a mountain-shaped protrusion that lifts the card key when the cover is opened.

[0025] Further, the key storage device can include a hook ring provided in the housing body to protrude from the housing body, a rack formed on a surface of the hook ring, and a pawl of a rack shape engaged with the rack of the fixing mechanism for fixing the hook ring.

[0026] Further, the key storage device can include a force applying mechanism that applies force to the cover in an opening direction, and a deceleration mechanism that decelerates the speed of the cover when the cover is opened.

[0027] Further, the key storage device can include a cover edge provided at an upper end of the cover to cover an upper edge of the housing body, and a protrusion provided along the cover edge in the housing body.

[0028] Inventive Effects

[0029] According to the key storage device of the present application, a key storage device can be provided in which a locking mechanism does not cause erroneous operation and can reliably lock. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 An embodiment of the key storage device of the present application is shown, (a) is a plan view, (b) is a front view, and (c) is a bottom view.

[0031] Figure 2 An embodiment of the key storage device of the present application is shown, (a) is a left side view, (b) is a right side view, and (c) is a rear view.

[0032] Figure 3 A perspective view of the key storage device of the present application is shown.

[0033] Figure 4 A locking mechanism of a cover of the key storage device of the present application is shown, (a1) is a cross-sectional view of an initial state, (a2) is a cross-sectional view of a main portion of (a1), (b1) is a cross-sectional view at the time of an opening operation instruction, and (b2) is a cross-sectional view of a main portion of (b1).

[0034] Figure 5 A locking mechanism of a cover of the key storage device of the present application is shown, (a) is a cross-sectional view at the time of an operation to close the cover, (b) is a cross-sectional view when the cover is closed, (c) is a cross-sectional view at the time of an opening operation instruction, and (d) is a cross-sectional view at the time of a slide (retraction) operation of a latch operation piece.

[0035] Figure 6(a) is a front view of the key storage device of the present application in a state where the cover and the front surface of the housing (cover) are detached, (b) is a front view showing the internal configuration.

[0036] Figure 7 is a flowchart of the operation of the locking mechanism of the cover of the key storage device of the present application.

[0037] Figure 8 (a) is a side view of the key storage device of the present application in a state where the cover is opened, (b) is a side view of the key storage device in a state where the end portion of the card key is pressed, (c) is a perspective view of the key storage device in a state where the end portion of the card key is not pressed.

[0038] Figure 9 is an explanatory diagram of the fixing mechanism of the shackle of the key storage device of the present application.

[0039] Figure 10 is an explanatory diagram of the shackle of the key storage device of the present application.

[0040] Figure 11 (a) is a front view of the key storage device of the present application, (b) is an X-X sectional view of (a), (c) is a side view, and (d) is an enlarged view of the main portion of (b).

[0041] Figure 12 (a) is a rear view, (b) is a side view, and (c) is a rear view of the housing to which the magnetic plate is attached, of the magnetic plate of the key storage device of the present application.

[0042] Figure 13 (a) is a plan view showing a state where the accessory is attached to the shackle, (b) is a front view of the state, (c) is a left side view of the state, (d) is a right side view of the state, and (e) is a front view showing a state where the accessory is opened, of the accessory of the key storage device of the present application.

[0043] Figure 14 (a) is a six-face view of the left side member, and (b) is a six-face view of the right side member, of the accessory of the key storage device of the present application.

[0044] Figure 15 (a) is a plan view, (b) is a front view, (c) is a right side view, (d) is a sectional view, and (e) is a perspective view, of the modified embodiment of the key storage device of the present application. DETAILED DESCRIPTION

[0045] Hereinafter, the embodiment of the key storage device of the present application will be described based on the drawings.

[0046] Figures 1-14An embodiment of the key storage device of the present application.

[0047] As Figures 1-3 shown, the key storage device is constituted by a case 1 in which a key storage space 12a in which a key for locking and unlocking a door body is stored is formed inside, and the case 1 can open and close an opening of a case main body 11 by pivotally supporting a lid 12 to the case main body 11 via a shaft 13. The lid 12 is always forced in an opening direction by a spring forced ejection pin 14 provided to the case main body 11.

[0048] [Locking mechanism 2 of lid 12]

[0049] As Figures 4-7 shown, the key storage device has, as a locking mechanism 2 of the lid 12, a latch 21 which is provided to the lid 12 and is forced in a protruding direction by a spring 21a (omitted from the drawing) to be caught to the case main body 11, a latch operation piece 22 which is provided to the case main body 11 to make the latch 21 retreat, an electric action mechanism 23 which makes the latch operation piece 22 act, and a control mechanism 24 of the electric action mechanism 23.

[0050] The electric action mechanism 23 which makes the latch operation piece 22 act has a servo motor 23a. The rotational force of the servo motor 23a is transmitted to a rack 23c formed to the latch operation piece 22 via a pinion 23b which engages with the rack 23c, and the latch operation piece 22 is slidably operated.

[0051] Note that, for the electric action mechanism 23, a solenoid can be used instead of the servo motor 23a.

[0052] The control mechanism 24 of the electric action mechanism 23 has a wireless communication section, and receives an authentication signal issued from a mobile terminal by wireless communication.

[0053] The locking mechanism 2 of the lid 12 can perform a lending process of a key by acting as a flowchart as Figure 7 shown.

[0054] The control unit 24 starts from the initial state of the power saving mode (step S1), and based on an input from the start switch 24a (the start switch 24a is operated by pressing the pressing portion 11a provided to the housing main body 11), determines whether or not the operation of the start switch 24a has been performed (step S2). In the power saving mode, the control unit 24 reduces power consumption by at least stopping the supply of power to the wireless communication unit. Alternatively, the control unit 24 can reduce power consumption by reducing the clock frequency of the CPU (Central Processing Unit) incorporated in the control unit 24 to a clock frequency lower than that used in normal operation.

[0055] In the case where it is determined in step S2 that the operation of the start switch 24a has not been performed, the control unit 24 returns to step S1, and the power saving mode is implemented.

[0056] The control unit 24 repeatedly cycles the processes based on steps S1 and S2 in order while the operation of the start switch 24a has not been performed, and thereby the power saving mode is implemented to suppress power consumption.

[0057] When the start switch 24a is operated and it is determined in step S2 that the operation of the start switch 24a has been performed, the control unit 24 starts measuring the elapsed time from the time point at which the start switch 24a is operated using the clock function incorporated in the control unit 24 (step S3). At this time, the control unit 24 releases the power saving mode, and supplies power to the wireless communication unit, and in the case where the clock frequency of the CPU incorporated in the control unit 24 is reduced, the control unit 24 performs processing to restore the clock frequency to the clock frequency used in normal operation.

[0058] At this time, the user can be notified that the operation of the start switch 24a has been performed, for example, by causing the LED (Light Emitting Diode) provided to the control unit 24 to emit light.

[0059] Subsequently, the control unit 24 proceeds to step S4, and determines whether or not the elapsed time from the time point at which the start switch 24a is operated has reached a set time, and proceeds to step S5 during the period in which it is determined that the set time has not been reached. The set time in this case can be set to, for example, several seconds to about 10 minutes, corresponding to the maximum time required to perform processing to issue an authentication signal, by the user operating the mobile terminal used as an authentication means, and in the present embodiment, the set time can be set to about 10 seconds.

[0060] In step S5, the control unit 24 determines whether or not the authentication signal has been received based on an input from the wireless communication unit.

[0061] In a case where it is determined in step S5 that the authentication signal has not been received, the control mechanism 24 returns to step S4, and repeatedly implements the processing cycle based on steps S4 and S5 until it is determined in step S4 that the elapsed time from the operation time point of the start switch 24a has reached the set time or it is determined in step S5 that the authentication signal has been received.

[0062] In a case where it is determined in step S4 that the elapsed time from the operation time point of the start switch 24a has reached the set time during the period in which the control mechanism 24 repeatedly implements the processing cycle based on steps S4 and S5, the control mechanism 24 proceeds to step S1, and starts the energy saving mode again.

[0063] When it is determined at the time point of proceeding to step S5 that the authentication signal has been received, the control mechanism 24 proceeds to step S6.

[0064] In step S6, the control mechanism 24 gives an opening operation command to the servo motor 23a of the electrically operated mechanism 23 that is the opening operation mechanism of the lock mechanism 2 of the cover 12.

[0065] When the servo motor 23a operates in accordance with the opening operation command, the rotational force of the servo motor 23a is transmitted to the rack 23c formed in the latch operation piece 22 that engages with the pinion 23b via the pinion 23b, and the latch operation piece 22 is slid (advanced) operated. Further, the latch operation piece 22 that is slid (advanced) operated causes the latch 21 that is latched to the housing main body 11 by the spring 21a that is forced in the protruding direction to retreat, and thus the latching of the latch 21 to the housing main body 11 is released, and the cover 12 is opened by the force of the ejection pin 14 that is provided to the housing main body 11 and is forced by the spring.

[0066] Next, the control mechanism 24 rotates the servo motor 23a in the direction opposite to the previous direction, and thus the latch operation piece 22 is slid (retracted) operated.

[0067] The time from when the latch operation piece 22 is slid (advanced) operated until it is slid (retracted) operated can be set to 1 to several seconds or so.

[0068] The cover 12 is latched in a state in which it is opened by about 90° by the hinge portion, and in this state, the key that is accommodated in the key accommodating space 12a can be taken out.

[0069] The user returns the key to the key storage space 12a at the end of use of the key, and performs a closing operation by rotating the cover 12 from this state. In step S6, the latch operation piece 22 is slid (retracted), so that the latch 21 provided to the cover 12 is caught to the case main body 11 as soon as the cover 12 is closed, and the cover 12 is held in a closed state to become a locked state, so that the key cannot be taken out.

[0070] The control mechanism 24 returns to the initial state (step S7), and returns to step S1 to start the process from step S1 again.

[0071] Here, the control mechanism 24 can have a detection mechanism that detects the opening and closing state of the cover 12, or a detection mechanism that detects the presence or absence of the key in the key storage space 12a, and further have a detection mechanism that detects the shape (volume) or weight of the key stored in the key storage space 12a, so that it is possible to find a case where a malicious user temporarily replaces a different key in order to copy the key by investigating the history.

[0072] Thus, it is possible to more accurately manage the key storage device, and to improve the security.

[0073] Thus, it is possible to provide a key storage device with high security, which can lend out a key only to a user who is authenticated by operating a mobile terminal serving as an authentication means to issue an authentication signal, and the locking mechanism 2 does not cause false operation and can reliably perform locking.

[0074] Further, when the user operates the mobile terminal serving as an authentication means to input an authentication signal to the wireless communication section, the control mechanism 24 performs a process of giving an opening operation command to the servo motor 23a of the electrically operated mechanism 23, so that it is not necessary to have information of the user, information of when the user uses the key in the control mechanism 24.

[0075] Thus, it is not necessary to connect to the outside via a network, and it is possible to reduce the cost of equipment required for automatically lending out a key.

[0076] Further, the management of the period, time when an authentication signal can be issued, and the like, which is the period when the key can be used, can be performed by an application program on the side of the mobile terminal serving as an authentication means.

[0077] Further, the control mechanism 24 is in a standby state before an authentication signal is input to the wireless communication section, so that it is possible to reduce the power consumption of the control mechanism 24 including the wireless communication section.

[0078] [About the Power Supply]

[0079] As Figure 6As shown, the power supply for the servo motor 23a of the electric actuator 23 and the control mechanism 24 including the wireless communication unit can be a primary battery or a secondary battery installed in the battery box 25a disposed in the housing body 11 of the housing 1, and a 9V square dry cell battery connected to the 9V square dry cell battery snap 25b disposed exposed in the housing body 11.

[0080] The primary or secondary battery installed in the battery compartment 25a serves as the normal power source, while the 9V square dry cell battery connected to the battery snap 25b serves as the emergency power source in case the normal power supply is interrupted. In particular, the 9V square dry cell battery used as the emergency power source has the advantage that it can be fixed to the housing body 11 by connecting to the battery snap 25b, eliminating the need to hold it by hand.

[0081] [Regarding the key storage space 12a in cover 12]

[0082] like Figure 8 As shown, a key storage space 12a is formed in the cover 12, and the cover 15 covering the lower part of the key storage space 12a is made to be swingable and is subjected to force on the upper end side towards the housing body 11 by the spring 15a.

[0083] Therefore, when the cover 12 is opened or closed, the key (including card key C) stored in the key storage space 12a can be prevented from falling out of the gap between the housing body 11 and the cover 12.

[0084] Furthermore, it can be configured such that the cover 12 has a protrusion 12b, which has a mountain-shaped protrusion that pushes up the card key C when the cover 12 is open (when it is opened to about 90°).

[0085] Therefore, when the cover 12 is open, the card key C can be lifted from the back of the cover 12 by pressing the end of the card key C with a finger, and can be easily removed.

[0086] [About hook and loop 3]

[0087] like Figures 9-10 As shown, the housing body 11 has a shackle 3 that is adjustable from the protruding size of the housing body 11. On the surface of the shackle 3, a rack 31 is formed that engages with a rack-shaped claw 32c of a fixing mechanism 32 for fixing the shackle 3.

[0088] Therefore, there is no protrusion on the inside of the hook 3. When the wireless communication unit of the control mechanism 24 uses radio waves in the 2.4 GHz band, it can prevent the influence of the hook 3 by ensuring a separation distance (usually about 16 mm or more) from the metal hook 3.

[0089] The fixing mechanism 32 for fixing the shackle 3 is composed of an operation piece 32a operable in a state where the cover 12 is opened, a claw piece 32c which moves in a front-rear direction by an inclined surface 32b formed in the operation piece 32a when the operation piece 32a is operated in an up-down direction, and a spring 32d which exerts a force to the claw piece 32c toward the inclined surface 32b.

[0090] Here, in a state where the cover 12 is closed, the operation piece 32a enters the recessed portion 12c of the cover 12, so as not to move downward even if an impact or the like is applied.

[0091] Thus, in a state where the cover 12 is closed, the fixing state of the shackle 3 is not released.

[0092] [Deceleration mechanism for slowing down the speed at the time of opening of the cover 12]

[0093] It can be configured that the cover 12 is always forced in the opening direction by a force applying mechanism, i.e., a spring force of the ejection pin 14 provided to the case main body 11, and as shown in Figure 11 , a deceleration mechanism 16 which slows down the speed at the time of opening of the cover 12 accelerated by the ejection pin 14 is provided.

[0094] The deceleration mechanism 16 is composed of a spring piece 16a formed integrally with the side surface of the cover 12, and the speed at the time of opening of the cover 12 is slowed down by the resistance of a protrusion 16b formed in the spring piece 16a when the protrusion 16b moves while abutting against the side surface of the case main body 11 from a guide groove 16c formed in the side surface of the case main body 11.

[0095] Thus, the speed at the time of opening of the cover 12 is slowed down, and at the time of opening of the cover 12, the key (including the card key C) accommodated in the key storage space 12a can be prevented from flying out due to an impact.

[0096] [About the magnetic plate 4]

[0097] As shown in Figure 12 , a recessed portion 11b in a rectangular shape is formed in the back surface of the case main body 11, and the magnetic plate 4 is installed therein.

[0098] Thus, when the key storage device is installed in the door handle of the door body via the shackle 3, the magnetic plate 4 is attracted to the door body made of a magnetic material, so that the case 1 can be set in a stable state.

[0099] [About the accessory 5]

[0100] In the case where the door handle of the door body is a pull rod handle, the key storage device is installed in the door handle of the door body with the accessory 5 as shown in Figures 13-14 .

[0101] The attachment 5 can integrate the left member 51 and the right member 52 via the shaft portions 53 integrally formed in the left member 51 and the right member 52, respectively.

[0102] Thus, when the key storage device is installed in the door handle of the door body via the shackle 3, the key storage device can be set in a stable state by sandwiching the attachment 5.

[0103] [About Modified Embodiment]

[0104] Figure 15 A modified embodiment of the key storage device is shown.

[0105] The key storage device is improved to be configured such that a recessed portion 11c is formed around the pressing portion 11a of the housing main body 11 of the key storage device, and a sealing strip is attached in the recessed portion 11c.

[0106] Thus, rainwater can be prevented from entering from the gap of the pressing portion 11a.

[0107] For the sealing strip, for example, a sealing strip printed with a figure of a fingertip can be used, so that the operation portion can be clearly indicated.

[0108] In addition, the key storage device is configured such that a cover rim 12d covering the upper end rim portion of the opening of the housing main body 11 is provided at the upper end of the cover body 12, and a protrusion portion 11d is formed in the housing main body 11 along the cover rim 12d.

[0109] Thus, there is no gap between the upper end rim portion of the opening of the housing main body 11 and the upper end of the cover body 12, and the cover body 12 can be prevented from being improperly opened with a screwdriver or the like.

[0110] In addition, the key storage device can be configured such that a recessed portion 12e is formed at the upper end portion of the cover body 12, and a sealing strip is attached in the recessed portion 12e.

[0111] For the sealing strip, for example, a sealing strip printed with a number for identifying the key storage device can be used.

[0112] The above describes the key storage device of the present application based on the embodiments, but the present application is not limited to the configurations described in the above embodiments, and the configurations can be appropriately changed within the scope of the gist of the present application.

[0113] [Industrial Applicability]

[0114] The key storage device of the present application can prevent the locking mechanism from being erroneously operated and can be locked as desired, and thus can be widely used in a room requiring entry restriction, such as a room in a bed and breakfast facility, a data room in a large company, and the like, in addition to a rental property.

[0115] [Reference Signs]

[0116] 1 housing

[0117] 11 housing body

[0118] 11a pressing portion

[0119] 11b recessed portion

[0120] 11c recessed portion

[0121] 11d protrusion portion

[0122] 12 cover

[0123] 12a key storage space

[0124] 12b protrusion

[0125] 12c recessed portion

[0126] 12d cover rim

[0127] 12e recessed portion

[0128] 13 shaft

[0129] 14 push-out pin

[0130] 15 cover portion

[0131] 15a spring

[0132] 16 speed reduction mechanism

[0133] 2 locking mechanism

[0134] 21 latch

[0135] 21a spring

[0136] 22 latch operation piece

[0137] 23 electrically operated mechanism

[0138] 23a servo motor

[0139] 23b pinion

[0140] 23c rack gear

[0141] 24 control mechanism

[0142] 24a start switch

[0143] 25a battery case

[0144] 25b battery snap for 9V square dry cell

[0145] 3 shackle

[0146] 31 rack

[0147] 32 fixing mechanism

[0148] 32a operation piece

[0149] 32b inclined surface

[0150] 32c claw piece

[0151] 32d spring

[0152] 4 magnet plate

[0153] 5 accessory

[0154] 51 left side member

[0155] 52 right side member

[0156] 53 shaft portion

Claims

1. A key storage device comprising a housing having an internal key storage space for storing keys used for locking and unlocking doors. The key storage device is characterized in that... The shell is formed by rotatably supporting the cover on the main body of the shell. As a locking mechanism for the cover, it has the following features: A latch, which is engaged with the housing body by a spring located on the cover in a protruding direction; A latching actuating plate, located on the housing body, retracts the latch; An electric actuating mechanism that actuates the latching plate; and Control mechanism for electric actuators.

2. The key storage device according to claim 1, characterized in that, The electric actuation mechanism that actuates the latching plate has a servo motor or a solenoid.

3. The key storage device according to claim 1 or 2, characterized in that, The control mechanism of the electric actuation mechanism has a wireless communication unit, which receives authentication signals from a mobile terminal via wireless communication.

4. The key storage device according to claim 1 or 2, characterized in that, The power source for the control mechanism of the electric actuator is a primary or secondary battery located inside the housing and a 9V square dry cell battery connected to a battery clip that is exposed in the housing.

5. The key storage device according to claim 1 or 2, characterized in that, The control mechanism of the electric actuator includes a start switch.

6. The key storage device according to claim 1 or 2, characterized in that, The cover forms a key storage space, and the cover portion covering the lower part of the key storage space is designed to be swingable and is spring-loaded toward the housing body on its upper side.

7. The key storage device according to claim 1 or 2, characterized in that, The cover forms a key storage space and has a protrusion with a mountain-shaped protrusion that lifts up the card key when the cover is open.

8. The key storage device according to claim 1 or 2, characterized in that, The housing body has a hook that is adjustable from the protruding size of the housing body, and a rack is formed on the surface of the hook that engages with a rack-shaped claw of a fixing mechanism for fixing the hook.

9. The key storage device according to claim 1 or 2, characterized in that, The key storage device includes: A force-applying mechanism that applies force to the cover in the opening direction; and The deceleration mechanism slows down the speed at which the cover opens.

10. The key storage device according to claim 1 or 2, characterized in that, A cover edge extends from the upper end of the cover body to cover the upper edge of the opening of the housing body, and a protrusion is formed on the housing body along the cover edge.

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