fire alarm bell

Abstract

The utility model discloses a fire alarm bell, it includes bottom shell, knocking device, release device and bell cover. The bottom shell includes assembly plate and ring wall, the ring wall extends from the circumference of assembly plate downward to form the shell cavity of bottom shell, the hook hole of assembly plate and the button hole of ring wall are communicated in the shell cavity, the knocking device includes power unit and the pendulum that is drivably connected in power unit, power unit is assembled in assembly plate, and the pendulum is located in the inside of bell cover, the release device includes elastic unit and button, and the elastic unit includes spring and hook body, and the assembly end of spring is assembled in the ring wall of bottom shell, and the hook body extends to one side of pendulum from the pressure end of spring through the hook hole of assembly plate of bottom shell to be able to hook and release pendulum, and the button is pressably installed in the button hole of ring wall of bottom shell, and the inner end of button is against the pressure end of spring.

Description

Technical Field

[0001] This utility model relates to an alarm device, and more particularly to a fire alarm bell. Background Technology

[0002] Fire alarm devices are crucial equipment for ensuring building fire safety. Their core function is to issue alarms, guide people to evacuate quickly, and reduce the risk of death and property damage caused by fire. For example, in Chinese utility model patent CN223390171U, the inventors disclosed a building fire alarm device, which includes a base, a housing, and a protective cover. A controller is installed at the bottom of the base, serving as the core of the system and controlling the operation of various electrical devices. A photoelectric sensor is installed on one side of the front of the controller, triggering an alarm by detecting the scattering or obstruction of light by smoke particles. A networking module is installed on the other side of the front of the controller, enabling remote communication between the device and the fire control center or other intelligent systems for timely fire reporting. An ionization sensor is installed on the front of the controller, detecting fires by utilizing changes in air ions under flames or high temperatures. An ionization chamber is located at the bottom of the base and controlled by the controller. The ionization chamber can be used to further detect changes in air ions, improving the accuracy of fire detection. The ionization chamber is covered by a housing, and a protective cover is installed at the bottom of the housing. The shortcomings of existing fire alarm devices are that they rely on electronic modules (i.e., controllers, photoelectric sensors, ionization sensors, and networking modules) and circuits. This results in poor reliability of existing fire alarm devices. For example, if one of the controllers, photoelectric sensors, ionization sensors, and networking modules fails or the circuit is burned by an open flame, the existing fire alarm devices will be unable to perform the alarm function. Utility Model Content

[0003] One objective of this invention is to provide a fire alarm bell that is a purely mechanical structure, requiring neither electronic modules nor circuitry. The fire alarm bell of this invention uses a pendulum striking the bell cover to trigger an alarm, thereby improving its reliability. Especially in fire environments, the fire alarm bell of this invention exhibits stronger high-temperature resistance than existing fire alarm devices.

[0004] One objective of this invention is to provide a fire alarm bell, wherein the spring of the power unit of the striking device can accumulate elastic potential energy, and the spring, in the process of releasing the elastic potential energy, enables the power unit to drive the pendulum to swing and strike the bell cover to achieve the alarm.

[0005] One objective of this invention is to provide a fire alarm bell, wherein the flat plate of the fire alarm bell covers the nuts used for locking the power unit and the bottom shell, so as to provide a flat deformation platform for the mainspring and avoid interference to the mainspring during the process of accumulating and releasing elastic potential energy.

[0006] According to one aspect of this utility model, a fire alarm bell is provided, comprising: Bell cover; A bottom shell, wherein the bottom shell includes an assembly plate and an annular wall, the annular wall extending downward from the periphery of the assembly plate to form a cavity of the bottom shell between the assembly plate and the annular wall, the assembly plate having a hook hole communicating with the cavity, and the annular wall having a button hole communicating with the cavity; A striking device, wherein the striking device includes a power unit and a pendulum drivably connected to the power unit, the power unit being mounted on the mounting plate, and the pendulum being located inside the bell cover; and A release device, wherein the release device includes an elastic unit and a button, the elastic unit including a spring and a hook, the spring having an opposing mounting end and a pressure-receiving end, the mounting end of the spring being mounted to the annular wall of the base shell, the hook extending from the pressure-receiving end of the spring through a hook hole in the mounting plate of the base shell to one side of the pendulum, so as to be able to hook and release the pendulum, the button being pressably mounted in the button hole in the annular wall of the base shell, the inner end of the button abutting against the pressure-receiving end of the spring.

[0007] According to one embodiment of the present invention, the spring and the hook are formed from the same metal plate.

[0008] According to one embodiment of the present invention, the power unit includes a frame assembly, a wheel assembly, and a spring. The frame assembly includes a top plate, a bottom plate, and a support column extending between the top plate and the bottom plate. The top plate has a central hole, and the bottom plate has a central hole. The wheel assembly includes a main shaft, a main wheel, a check wheel, a drive wheel, a ratchet, and an assembly shaft. The top of the main shaft passes through the central hole of the top plate and is rotatably mounted on the top plate. The bottom of the main shaft passes through the central hole of the bottom plate and is rotatably mounted on the bottom plate. The main wheel is rotatably fitted onto the main shaft. The check wheel is fixedly fitted onto the main shaft and stacked on top of the main wheel. The check wheel is configured to allow only the main wheel to pass through. The main shaft rotates unidirectionally. The opposite ends of the drive wheel axle, the opposite ends of the ratchet axle, and the opposite ends of the mounting shaft are rotatably mounted on the top plate and the bottom plate, respectively. The drive wheel meshes with the main wheel, and the ratchet meshes with the drive wheel. The inner end of the mainspring is fixed to the bottom of the main shaft, and the outer end is set to remain stationary relative to the bottom shell. The pendulum has a driving end and a striking end. The driving end of the pendulum is fixedly fitted onto the mounting shaft, and the driving end of the pendulum has two spaced-apart claws that can alternately enter and exit the tooth gap of the ratchet to drive the pendulum to swing by the power transmitted by the ratchet. The bell cover is mounted on the top of the main shaft.

[0009] According to one embodiment of the present invention, the mounting plate of the bottom shell has a first plate through hole, the first plate through hole communicating with the shell cavity, the bottom of the main shaft passing through the first plate through hole of the mounting plate and extending to the shell cavity, and the mainspring being located in the shell cavity of the bottom shell.

[0010] According to one embodiment of the present invention, the top plate has a top plate edge hole, the bottom plate has a bottom plate edge hole, the mounting plate of the bottom shell has a second plate through hole communicating with the shell cavity, the top of the support column is screwed with a nut after passing through the top plate edge hole of the top plate to install the top of the support column on the top plate, and the bottom of the support column is screwed with a nut after passing through the bottom plate edge hole of the bottom plate and the second plate through hole of the mounting plate to install the bottom of the support column on the bottom plate and to install the frame assembly on the mounting plate of the bottom shell.

[0011] According to one embodiment of the present invention, the fire alarm bell includes a flat panel with a third plate through hole. The flat panel is fixedly installed in the cavity of the bottom shell in a manner that covers the nut. The bottom of the main shaft passes through the third plate through hole of the flat panel and then the inner end of the spring is installed thereon, so that the spring is stacked on the side of the flat panel away from the mounting plate.

[0012] According to one embodiment of the present invention, the cavity of the bottom shell is elliptical, the flat plate is rectangular, and the four corners of the flat plate abut against four different positions of the annular wall of the bottom shell, so that the flat plate is fixedly installed in the cavity of the bottom shell.

[0013] According to one embodiment of the present invention, a hook post is provided at one end of the flat plate, and the outer end of the spring is fixed to the hook post of the flat plate, so that the outer end of the spring is set to remain stationary relative to the bottom shell.

[0014] According to one embodiment of the present invention, the main wheel has a plurality of forward guide blocks arranged in a ring, and the anti-reverse wheel has a plurality of deformed anti-reverse arms and a mating surface located at the end of the anti-reverse arms. The slope of the mating surface is adapted to the slope of the forward guide blocks. When the main shaft and the anti-reverse wheel rotate in a clockwise direction, the mating surface of the anti-reverse wheel crosses the forward guide block of the main wheel. When the main shaft and the anti-reverse wheel rotate in a counterclockwise direction, the mating surface of the anti-reverse wheel abuts against the forward guide block of the main wheel.

[0015] According to one embodiment of the present invention, the fire alarm bell includes a bottom cover, which is installed on the annular wall so as to cover the opening of the shell cavity. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a fire alarm bell according to a preferred embodiment of the present invention.

[0017] Figure 2 This is a perspective view of the fire alarm bell according to the above-described preferred embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the fire alarm bell according to the above-described preferred embodiment of the present invention.

[0019] Figure 4 This is an exploded view of the fire alarm bell according to the above-described preferred embodiment of the present invention.

[0020] Figure 5 This is an exploded view of a partial location of the fire alarm bell according to the above-described preferred embodiment of the present invention.

[0021] Figure 6 This is a perspective view of a partial location of the fire alarm bell according to the above-described preferred embodiment of the present invention.

[0022] Figure 7 This is a three-dimensional schematic diagram of a specific application scenario of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0023] Figure 8 This is a perspective view of one of the usage states of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0024] Figure 9 This is a top view schematic diagram of one of the usage states of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0025] Figure 10 This is a cross-sectional schematic diagram showing one of the usage states of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0026] Figure 11 This is a perspective view of the second usage state of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0027] Figure 12 This is a top view schematic diagram of the second usage state of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0028] Figure 13 This is a cross-sectional schematic diagram showing the second usage state of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0029] Figure 14 This is a top view schematic diagram of the third usage state of the fire alarm bell according to the above-described preferred embodiment of the present utility model.

[0030] Figure 15 This is a partial perspective view of a modified example of the fire alarm bell according to the above-described preferred embodiment of the present invention. Detailed Implementation

[0031] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof herein is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0032] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0033] Refer to the appendix of the specification of this utility model. Figures 1 to 14 A preferred embodiment of the present invention will be disclosed and described in the following description, wherein the fire alarm bell includes a base shell 10, a striking device 20, a bell cover 30 and a release device 40.

[0034] Specifically, the bottom shell 10 includes an assembly plate 11, an annular wall 12, and a cavity 13. The annular wall 12 extends downward from the periphery of the assembly plate 11 to form the cavity 13 between the assembly plate 11 and the annular wall 12. The assembly plate 11 has a hook hole 111 that communicates with the cavity 13, and the annular wall 12 has a button hole 121 that communicates with the cavity 13.

[0035] In the appendix Figures 1 to 14In this specific example of the fire alarm bell of the present invention, the base shell 10 is formed from a metal plate by a cold-drawing process, so that the annular wall 12 extends integrally downward from the periphery of the mounting plate 11. It is understood that, to facilitate the formation of the hook hole 111 in the mounting plate 11 and the button hole 121 in the annular wall 12, holes are punched in the corresponding positions of the metal plate before cold drawing. Thus, after cold drawing the metal plate to form the base shell 10, one hole forms the hook hole 111 in the mounting plate 11, and the other hole forms the button hole 121 in the annular wall 12.

[0036] Preferably, in the appendix Figures 1 to 14 In this specific example of the fire alarm bell of the present invention, the mounting plate 11 is elliptical, thereby making the cavity 13 of the bottom shell 10 an elliptical cavity. Optionally, in other specific examples of the fire alarm bell of the present invention, the cavity 13 of the bottom shell 10 may also be a circular cavity or a square cavity.

[0037] Reference Appendix Figures 3 to 5 The striking device 20 includes a power unit 21 and a pendulum 22. The pendulum 22 is drivably connected to the power unit 21. The power unit 21 is mounted on the mounting plate 11 of the bottom shell 10. The pendulum 22 is located inside the bell cover 30. When the power unit 21 drives the pendulum 22 to swing, the pendulum 22 strikes the inner wall of the bell cover 30, causing the fire alarm bell to produce an alarm sound.

[0038] Continue to refer to the appendix Figures 3 to 5 The release device 40 includes an elastic unit 41 and a button 42. The elastic unit 41 includes a spring plate 411 and a hook 412. The spring plate 411 has an assembly end 4111 and a pressure-receiving end 4112 relative to the assembly end 4111. The assembly end 4111 of the spring plate 411 is assembled to the annular wall 12 of the bottom shell 10 to install the elastic unit 41 onto the bottom shell 10. The hook 412 extends from the pressure-receiving end 4111 of the spring plate 411. 12 extends through the hook hole 111 of the mounting plate 11 of the base shell 10 to one side of the pendulum 22, so that the hook body 412 can hook or release the pendulum 22, wherein the button 42 is pressably mounted in the button hole 121 of the annular wall 12 of the base shell 10, the inner end of the button 42 extends into the shell cavity 13 of the base shell 10 and abuts against the pressure end 4112 of the spring piece 411, and the outer end of the button 42 is located outside the base shell 10. Preferably, the spring piece 411 and the hook body 412 are formed from the same metal plate.

[0039] In its natural state, the pressure-bearing end 4112 of the spring plate 411 presses against the inner end of the button 42 towards the annular wall 12 of the bottom shell 10. Simultaneously, the spring plate 411 keeps the hook 412 in the position of hooking the pendulum 22, preventing the pendulum 22 from swinging. At this time, the pendulum 22 does not strike the inside of the bell cover 30. When the outer end of the button 42 is pressed, the inner end of the button 42 pushes the pressure-bearing end 4112 of the spring plate 411 inward, causing the spring plate 411 to deform and accumulate elastic potential energy. Simultaneously, the hook 412 releases the pendulum 22. At this time, the power unit 21 can drive the pendulum 22 to swing. During the swing, the pendulum 22 strikes the inner wall of the bell cover 30, causing the fire alarm bell to sound.

[0040] It is worth mentioning that the specific method of assembling the mounting end 4111 of the spring piece 411 to the annular wall 12 of the bottom shell 10 is not limited in the fire alarm bell of this utility model. For example, in the attached Figures 1 to 14 In this specific example of the fire alarm bell of the present invention shown, the screw 100 can be used to assemble the mounting end 4111 of the spring 411 to the annular wall 12 of the bottom shell 10. Specifically, the annular wall 12 has an annular wall hole 122 adjacent to the button hole 121, and the spring piece 411 has a spring piece hole 4113 located at the mounting end 4111. After the mounting end 4111 of the spring piece 411 is stacked on the inner wall of the annular wall 12 and the spring piece hole 4113 of the spring piece 411 corresponds to the annular wall hole 122 of the annular wall 12, the threaded end of the screw 100 passes through the annular wall hole 122 of the annular wall 12 and the spring piece hole 4113 of the spring piece 411 in sequence, and the threaded end of the screw 100 is at least screwed to the spring piece 411, so that the mounting end 4111 of the spring piece 411 is mounted on the annular wall 12 of the bottom shell 10 by the screw 100. Optionally, in other examples of the fire alarm bell of this utility model, the mounting end 4111 of the spring 411 can be welded to the annular wall 12 of the bottom shell 10.

[0041] Preferably, the inner diameter of the button hole 121 of the annular wall 12 of the bottom shell 10 is larger than the outer diameter of the middle part of the button 42. In this way, even if the button 42 is pushed to the side during the pressing of the button 42, the inner end of the button 42 can push the pressure end 4112 of the spring piece 411 inward.

[0042] Specifically, the button 42 includes a button rod 421 and a button cap 422. The button rod 421 includes an anti-detachment cap 4211 and a rod body 4212 integrally extending outward from the anti-detachment cap 4211. The outer diameter of the anti-detachment cap 4211 is larger than the inner diameter of the button hole 121 of the annular wall 12, and the outer diameter of the rod body 4212 is smaller than the inner diameter of the button hole 121 of the annular wall 12. The button cap 422 has an insertion hole 4221. After the end of the rod body 4212 of the button rod 421 facing away from the anti-detachment cap 4211 passes through the button hole 121 of the annular wall 12 from the cavity 13 of the bottom shell 10, this end of the rod body 4212 is inserted into the insertion hole 4221 of the button cap 422, thus installing the button 42 in the button hole 121 of the annular wall 12 of the bottom shell 10. It is understood that because the outer diameter of the anti-detachment cap 4211 of the button lever 421 is larger than the inner diameter of the button hole 121 of the annular wall 12, the button 42 will not detach outward from the bottom shell 10. Preferably, the outer diameter of the button cap 422 is larger than the inner diameter of the button hole 121 of the annular wall 12, so that the button 42 will not detach inward from the bottom shell 10. The anti-detachment cap 4211 of the button lever 421 is the part of the button lever 421 that directly contacts the spring piece 411.

[0043] Further, please refer to the appendix. Figures 3 to 5 The power unit 21 includes a frame assembly 211, a wheel assembly 212, and a spring 213.

[0044] Specifically, the frame assembly 211 includes a top plate 2111, a bottom plate 2112, and a set of support columns 2113. The top of each support column 2113 is installed on the top plate 2111, and the bottom of each support column 2113 is installed on the bottom plate 2112. The top plate 2111 has a central hole 21111, and the bottom plate 2112 has a central hole 21121. Preferably, there are three support columns 2113, which are arranged at intervals.

[0045] The wheel assembly 212 includes a main shaft 2121, a main wheel 2122, a check wheel 2123, a transmission wheel 2124, a ratchet 2125, and a mounting shaft 2126. The top of the main shaft 2121 passes through the center hole 21111 of the top plate 2111, so that the top of the main shaft 2121 protrudes from the top plate 2111. The top of the main shaft 2121 is rotatably mounted on the top plate 2111. The bottom of the main shaft 2121 passes through the center hole 21121 of the bottom plate 2112, so that the bottom of the main shaft 2121 protrudes from the bottom plate 2112. The bottom of the main shaft 2121 is rotatably mounted on the bottom plate 2112. That is, the main shaft 2121 is configured to rotate about its own central axis relative to the frame assembly 211. The main wheel 2122 is rotatably mounted on the main shaft 2121, allowing the main wheel 2122 and the main shaft 2121 to rotate relative to each other. The anti-reverse wheel 2123 is fixedly mounted on the main shaft 2121, allowing the anti-reverse wheel 2123 and the main shaft 2121 to rotate synchronously and with the same amplitude, wherein the anti-reverse wheel 2123 is configured to allow only unidirectional rotation of the main wheel 2122 relative to the main shaft 2121. The opposite ends of the axle of the transmission wheel 2124 are rotatably mounted on the top plate 2111 and the bottom plate 2112, respectively, and the transmission wheel 2124 is engaged with the main wheel 2122, enabling the main wheel 2122 to drive the transmission wheel 2124 to rotate around its own central axis. The ratchet 2125 has its axle rotatably mounted at opposite ends to the top plate 2111 and the bottom plate 2112, respectively, and is engaged with the drive wheel 2124, so that the drive wheel 2124 can drive the ratchet 2125 to rotate around its own central axis. The mounting shaft 2126 has its opposite ends rotatably mounted to the top plate 2111 and the bottom plate 2112, respectively. Preferably, the wheel assembly 212 includes a stop ring 2127, which is fitted onto the main shaft 2121 and located between the main wheel 2122 and the top plate 2111, to prevent the main wheel 2122 from moving along the length of the main shaft 2121.

[0046] The pendulum 22 has a driven end 221 and a striking end 222 corresponding to the driven end 221. The driven end 221 of the pendulum 22 is fixedly fitted onto the mounting shaft 2126, and the pendulum 22 has two spaced-apart claws 223 on the driven end 221. When the ratchet 2125 transmits power in a rotating manner, the two claws 223 of the pendulum 22 can alternately enter and exit the tooth gap of the ratchet 2125, thereby causing the power transmitted by the ratchet 2125 to drive the pendulum 22 to swing, so that the striking end 222 of the pendulum 22 strikes the bell cover 30 mounted on the top of the main shaft 2121. Preferably, a threaded post 31 of the bell cover 30 is screwed onto the top of the main shaft 2121.

[0047] The inner end of the mainspring 213 is fixed to the bottom of the main shaft 2121, and the outer end of the mainspring 213 is set to remain stationary relative to the bottom shell 10. When the main shaft 2121 is rotated clockwise, the main shaft 2121 drives the mainspring 213 to deform and accumulate elastic potential energy. During the process of the mainspring 213 returning to its initial state, it can drive the main shaft 2121 to rotate counterclockwise.

[0048] In its natural state, the spring piece 411 keeps the hook body 412 in the position of hooking the pendulum 22 to prevent the pendulum 22 from swinging. At this time, one of the claws 223 of the driven end 221 of the pendulum 22 engages in the tooth gap of the ratchet 2125, causing the pendulum 22 to lock the ratchet 2125 and prevent the ratchet 2125 from rotating. The ratchet 2125 prevents the transmission wheel 2124 from rotating, and the transmission wheel 2124 prevents the main wheel 2122 from rotating. When the bell cover 30 is rotated clockwise, the bell cover 30 drives the main shaft 2121 and the anti-reverse wheel 2123 to rotate, so that the mainspring 213 deforms and accumulates elastic potential energy. During this process, since the pendulum 22 holds the ratchet 2125, the ratchet 2125 and the transmission wheel 2124 are engaged, and the transmission wheel 2124 and the main wheel 2122 are engaged, the main wheel 2122 is prevented from rotating. After the button 42 is pressed, causing the hook 412 to release the pendulum 22, the spring 213 drives the main shaft 2121, the main wheel 2122, the anti-reverse wheel 2123, and the bell cover 30 to rotate synchronously during the process of returning to the initial state. The main wheel 2122 drives the transmission wheel 2124 to rotate, the transmission wheel 2124 drives the ratchet 2125 to rotate, and the ratchet 2125 drives the pendulum 22 to swing so that the striking end 222 of the pendulum 22 strikes the bell cover 30 mounted on the top of the main shaft 2121.

[0049] Furthermore, the main wheel 2122 has a plurality of forward guide blocks 21221 arranged in a ring, and the anti-reverse wheel 2123 has a plurality of deformed anti-reverse arms 21231 and a mating surface 21232 located at the end of the anti-reverse arms 21231 on its periphery. The slope of the mating surface 21232 is adapted to the slope of the forward guide blocks 21221. When the main shaft 2121 and the anti-reverse wheel 2123 rotate clockwise, the forward guide block 21221 of the main wheel 2122 pushes the anti-reverse arm 21231 to deform along the length of the main shaft 2121 in a direction away from the main wheel 2122, so that the mating surface 21232 of the anti-reverse wheel 2123 passes over the forward guide block 21221 of the main wheel 2122. After passing over, the anti-reverse arm 21231 of the anti-reverse wheel 2123 automatically returns to its initial position. When the main shaft 2121 and the anti-reverse wheel 2123 rotate counterclockwise, the mating surface 21232 of the anti-reverse wheel 2123 abuts against the forward guide block 21221 of the main wheel 2122. Thus, the anti-reverse wheel 2123 is set to allow the main wheel 2122 to rotate only in one direction relative to the main shaft 2121.

[0050] Furthermore, the mounting plate 11 of the bottom shell 10 has a first plate through hole 112, which communicates with the shell cavity 13. The bottom of the spindle 2121 extends to the shell cavity 13 after passing through the first plate through hole 112 of the mounting plate 11. Thus, the inner end of the spring 213 can be fixedly mounted to the bottom of the spindle 2121 in such a way that the spring 213 is located in the shell cavity 13.

[0051] Further, see Appendix Figure 5 The top plate 2111 of the frame assembly 211 has a set of top plate edge holes 21112, the bottom plate 2112 has a set of bottom plate edge holes 21122, and the mounting plate 11 of the bottom shell 10 has a set of second plate through holes 113. The top of the support column 2113 is screwed with a nut 200 after passing through the top plate edge hole 21112 of the top plate 2111 to fix the top of the support column 2113 to the top plate 2111. The bottom of the support column 2113 is screwed with the nut 200 after passing through the bottom plate edge hole 21122 of the bottom plate 2112 and the second plate through hole 113 of the mounting plate 11 to fix the bottom of the support column 2113 to the bottom plate 2112, and the frame assembly 211 is mounted on the mounting plate 11.

[0052] Preferably, the mounting plate 11 of the bottom shell 10 has a plurality of clearance holes 114 for avoiding contact between the bottom of the axle of the transmission wheel 2124, the bottom of the axle of the ratchet 2125, and the bottom of the mounting shaft 2126, thus preventing these parts from touching the mounting plate 11. Preferably, the clearance holes 114 of the mounting plate 11 are through holes.

[0053] Furthermore, the fire alarm bell includes a flat panel 50 with a third plate through-hole 51. The flat panel 50 is fixedly installed in the cavity 13 of the bottom shell 10. The flat panel 50 covers the nut 200 screwed to the bottom of the support column 2113. The bottom of the main shaft 2121 passes through the third plate through-hole 51 of the flat panel 50. In this way, the spring 213 can be stacked on the side of the flat panel 50 away from the mounting plate 11 to avoid the nut 200 screwed to the bottom of the support column 2113 interfering with the deformation of the spring 213, thereby ensuring the reliability of the fire alarm bell.

[0054] In the appendix Figures 1 to 14 In this specific example of the fire alarm bell of the present invention, the cavity 13 of the base shell 10 is elliptical, and the flat plate 50 is rectangular. The four corners of the flat plate 50 abut against four different positions of the annular wall 12 of the base shell 10, so that the flat plate 50 is fixedly installed in the cavity 13 of the base shell 10, preventing the flat plate 50 from rotating relative to the base shell 10. Optionally, in other examples of the fire alarm bell of the present invention, the flat plate 50 can be locked to the base shell 10, or the flat plate 50 can be welded to the base shell 10.

[0055] Preferably, one end of the flat panel 50 is provided with a hook post 52, and the outer end of the spring 213 is fixed to the hook post 52 of the flat panel 50, so that the outer end of the spring 213 is set to remain stationary relative to the bottom shell 10. It is understood that since the flat panel 50 is fixedly mounted to the cavity 13 of the bottom shell 10, fixing the outer end of the spring 213 to the hook post 52 of the flat panel 50 allows the outer end of the spring 213 to remain stationary relative to the bottom shell 10.

[0056] Preferably, refer to the appendix Figures 2 to 4The fire alarm bell includes a bottom cover 60, which is installed on the annular wall 12 of the bottom shell 10 so that the bottom cover 60 covers the opening of the cavity 13 to conceal the spring 213. In some examples of the fire alarm bell of this utility model, the edge of the bottom cover 60 can be locked onto the annular wall 12 of the bottom shell 10, thereby allowing the bottom cover 60 to be installed on the annular wall 12.

[0057] Appendix Figures 7 to 14 This illustration shows a specific application example of the fire alarm bell of this utility model. The fire alarm bell is installed in an alarm box 70. The alarm box 70 includes a box body 71, a metal plate 72, and a push switch 73. The box body 71 has a box space 710 and a sound-transmitting hole 720 communicating with the box space 710. The metal plate 72 is arc-shaped and is located in the box space 710 of the box body 71. The opposite ends of the metal plate 72 are respectively fixedly disposed in the box body 71. The push switch 73 is pressably installed in the box body 71. The inner end of the push switch 73 is located in the box space 710 of the box body 71 and abuts against the middle of the metal plate 72. The outer end of the push switch 73 protrudes from the box body 71 so that the push switch 73 can be pressed. The fire alarm bell is installed in the housing space 710 of the housing 71. The outer end of the button cap 422 of the button 42 corresponds to the middle of the metal plate 72. When the push switch 73 is pressed, causing the metal plate 72 to deform and arch (i.e., the middle of the metal plate 72 deforms from protruding to one side to protruding to the other side), the metal plate 72 pushes the button cap 422 of the button 42 inward. The inner end of the button cap 422 pushes the pressure end 4112 of the spring piece 411 inward, causing the spring piece 411 to deform and accumulate elastic potential energy. At the same time, the hook 412 releases the pendulum 22. At this time, the power unit 21 can drive the pendulum 22 to swing. During the swing, the pendulum 22 strikes the inner wall of the bell cover 30, causing the fire alarm bell to produce an alarm sound.

[0058] Reference Appendix Figure 7 , Figure 8 and Figure 11 The box body 71 includes a bottom shell 711 and a top cover 712. The top cover 712 is detachably installed on the bottom shell 711. After the top cover 712 is installed on the bottom shell 711, the box body 71 forms the box body space 710 between the bottom shell 711 and the top cover 712. The sound-permeable hole 720 can be provided in the bottom shell 711 to hide the sound-permeable hole 720.

[0059] The alarm box 70 includes a bracket 74 with a strip-shaped groove 741. The length of the groove 741 is less than the length of the metal sheet 72, and the width of the groove 741 is greater than the width of the metal sheet 72. The two opposite ends of the bracket 74 are fixedly mounted to the bottom shell 711, and the two opposite ends of the metal sheet 72 are fixedly mounted to the two opposite ends of the bracket 74. The middle position of the metal sheet 72 corresponds to the position of the groove 741 of the bracket 74. Thus, the bracket 74 fixes the two opposite ends of the metal sheet 72 to the box body 71. The bottom shell 711 has a bottom shell hole 7111 communicating with the box body space 710. The outer end of the push-button switch 73 extends to the outside through the bottom shell hole 7111 of the bottom shell 711 for pressing. The fire alarm bell is fixedly installed on the bottom shell 711 so that the positions of the fire alarm bell and the metal plate 72 remain unchanged.

[0060] Appendix Figure 15 The illustration shows a modified example of the fire alarm bell of this utility model, with reference to the appendix. Figures 1 to 14 Unlike the fire alarm bell shown, the one attached... Figure 15 In this specific example of the fire alarm bell shown, the pendulum 22 includes a hammer plate 2201 and a hammer arm 2202. The hammer plate 2201 has two spaced-apart claws 223. The hammer plate 2201 is fixedly mounted on the assembly shaft 2126. As the assembly shaft 2126 rotates, the two claws 223 of the hammer plate 2201 can alternately enter or exit the tooth gap of the ratchet 2125. One end of the hammer arm 2202 is fixedly disposed on the assembly shaft 2126. As the assembly shaft 2126 rotates, the hammer arm 2202 can strike the bell cover 30, causing the fire alarm bell to produce an alarm sound.

[0061] It is worth mentioning that the specific manner in which the hammer arm 2202 is fixedly mounted on the assembly shaft 2126 is not limited in the fire alarm bell of this utility model. For example, in the attached... Figure 15 In this specific example of the fire alarm bell of the present invention, the middle part of the assembly shaft 2126 is provided with a slot 21261, the size of which matches the size of the end of the hammer arm 2202. After the end of the hammer arm 2202 is inserted into the slot 21261 of the assembly shaft 2126, the hammer arm 2202 and the assembly shaft 2126 are welded together, so that the end of the hammer arm 2202 is fixedly set on the assembly shaft 2126.

[0062] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from these principles.

Claims

1. A fire alarm bell, characterized in that, include: Bell cover; A bottom shell, wherein the bottom shell includes an assembly plate and an annular wall, the annular wall extending downward from the periphery of the assembly plate to form a cavity of the bottom shell between the assembly plate and the annular wall, the assembly plate having a hook hole communicating with the cavity, and the annular wall having a button hole communicating with the cavity; A striking device, wherein the striking device includes a power unit and a pendulum drivably connected to the power unit, the power unit being mounted on the mounting plate, and the pendulum being located inside the bell cover; and A release device, wherein the release device includes an elastic unit and a button, the elastic unit including a spring and a hook, the spring having an opposing mounting end and a pressure-receiving end, the mounting end of the spring being mounted to the annular wall of the base shell, the hook extending from the pressure-receiving end of the spring through a hook hole in the mounting plate of the base shell to one side of the pendulum, so as to be able to hook and release the pendulum, the button being pressably mounted in the button hole in the annular wall of the base shell, the inner end of the button abutting against the pressure-receiving end of the spring.

2. The fire alarm bell according to claim 1, wherein the spring and the hook are formed from the same metal plate.

3. The fire alarm bell according to claim 1, wherein the power unit includes a frame assembly, a wheel assembly, and a spring, wherein the frame assembly includes a top plate, a bottom plate, and a support column extending between the top plate and the bottom plate, the top plate having a top plate center hole, the bottom plate having a bottom plate center hole, wherein the wheel assembly includes a main shaft, a main wheel, a backstop wheel, a transmission wheel, a ratchet, and an assembly shaft, the top of the main shaft passing through the top plate center hole of the top plate and being rotatably mounted on the top plate, the bottom of the main shaft passing through the bottom plate center hole of the bottom plate and being rotatably mounted on the bottom plate, the main wheel being rotatably fitted onto the main shaft, the backstop wheel being fixedly fitted onto the main shaft, the backstop wheel being stacked on top of the main wheel, and the backstop wheel being configured to only allow the main wheel to pass through the top plate center hole. The main wheel rotates unidirectionally relative to the main shaft. The opposite ends of the axle of the drive wheel, the opposite ends of the axle of the ratchet, and the opposite ends of the mounting shaft are rotatably mounted on the top plate and the bottom plate, respectively. The drive wheel meshes with the main wheel, and the ratchet meshes with the drive wheel. The inner end of the mainspring is fixed to the bottom of the main shaft, and the outer end is set to remain stationary relative to the bottom shell. The pendulum has a driving end and a striking end. The driving end of the pendulum is fixedly fitted onto the mounting shaft, and the driving end of the pendulum has two spaced-apart claws. The two claws can alternately enter and exit the tooth gap of the ratchet so that the pendulum is driven to swing by the power transmitted by the ratchet. The bell cover is mounted on the top of the main shaft.

4. The fire alarm bell according to claim 3, wherein the mounting plate of the bottom shell has a first plate through hole, the first plate through hole communicating with the shell cavity, the bottom of the main shaft extends through the first plate through hole of the mounting plate to the shell cavity, and the mainspring is located in the shell cavity of the bottom shell.

5. The fire alarm bell according to claim 4, wherein the top plate has a top plate edge hole, the bottom plate has a bottom plate edge hole, the mounting plate of the bottom shell has a second plate through hole communicating with the shell cavity, the top of the support column is screwed with a nut after passing through the top plate edge hole of the top plate to install the top of the support column on the top plate, and the bottom of the support column is screwed with a nut after passing through the bottom plate edge hole of the bottom plate and the second plate through hole of the mounting plate to install the bottom of the support column on the bottom plate and to install the frame assembly on the mounting plate of the bottom shell.

6. The fire alarm bell according to claim 5, wherein the fire alarm bell includes a flat panel having a third plate through hole, the flat panel being fixedly installed in the cavity of the bottom shell in a manner covering the nut, the bottom of the main shaft passing through the third plate through hole of the flat panel and then installing the inner end of the spring, so that the spring is stacked on the side of the flat panel opposite to the mounting plate.

7. The fire alarm bell according to claim 6, wherein the cavity of the bottom shell is elliptical, the flat plate is rectangular, and the four corners of the flat plate abut against four different positions of the annular wall of the bottom shell, so that the flat plate is fixedly installed in the cavity of the bottom shell.

8. The fire alarm bell according to claim 6, wherein one end of the flat panel is provided with a hook post, and the outer end of the spring is fixed to the hook post of the flat panel, so that the outer end of the spring is set to remain stationary relative to the bottom shell.

9. The fire alarm bell according to any one of claims 3 to 8, wherein the main wheel has a plurality of forward guide blocks arranged in a ring, the anti-reverse wheel has a plurality of deformed anti-reverse arms and a mating surface located at the end of the anti-reverse arms, the slope of the mating surface is adapted to the slope of the forward guide blocks, when the main shaft and the anti-reverse wheel rotate in a clockwise direction, the mating surface of the anti-reverse wheel crosses the forward guide block of the main wheel, and when the main shaft and the anti-reverse wheel rotate in a counterclockwise direction, the mating surface of the anti-reverse wheel abuts against the forward guide block of the main wheel.

10. The fire alarm bell according to any one of claims 1 to 8, wherein the fire alarm bell includes a bottom cover, the bottom cover being installed on the annular wall such that the bottom cover covers the opening of the cavity.

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