TECHNICAL FIELD

The present invention refers to a luminary, and specifically to a water and dust resistant artificial candle apparatus.

BACKGROUND

The subdued light from a candle is loiown to be able to set a pleasant and relaxing mood. Amongst the young at heart, candles are used for their aesthetic value. Its soft, warm subdued light creates a romantic atmosphere. Candlelight can somehow bring a special sense of calm and wellness that other commercial lights cannot, be it due to fashion, cultural or traditional reasons. Candles have also been used for centuries for other purposes including during religious ceremonies, in places of worship and in modern home decorations.

Traditional combustible candles have several deficiencies. (1) it is easily blown out by wind; (2) it is easily extinguished by water; (3) it is unsafe around elderly or physically disadvantaged people, children and pets. For these reasons, artificial candles are gaining in popularity.

A conventional artificial candle includes a shell and a core module mounted within the shell. The core module includes a housing, a flame member, a light source, a drive mechanism and a control circuit. The flame member extends out of the housing and the shell via a through-hole. The drive mechanism is positioned under the flame member. The control circuit is adapted to send a drive signal to the drive mechanism. The drive mechanism occasionally applies a force on the pendulum element based on the drive signal to make the flame member sway, and the flame member reflects the light from the light source to give the illusion of a swaying candle flame. However, although conventional artificial candles can overcome the defects of combustible candles, they fail to be water and dust resistant. Water, or small objects may run into the housing through a through-hole where the flame member is mounted. The drive mechanism, the light source and the control circuit may get wet or clogged, damaging the core module or shorten the work time.

SUMMARY OF THE INVENTION

To overcome the defects described above, the present invention provides a water and dust resistant artificial candle apparatus, which has a water and dust resistant effect and simulates a candle flame realistically.

Some embodiments of the present invention refer to:

A water and dust resistant artificial candle apparatus, comprising:

a core module, comprising a housing, a twisted flame member, a light source, a drive mechanism and a control circuit;

wherein a top portion of the housing has a hermetically sealed blind hole and a lamp-holding hole adjacent to the blind hole; the light source is mounted in the lamp-holding hole hermetically and transmits a convergent light obliquely onto the twisted flame member; a lower portion of the twisted flame member is pivotally mounted in the blind hole; an upper portion of the twisted flame member extends out of the housing through the blind hole; the drive mechanism is positioned under the bottom wall of the blind hole; the control circuit is adapted to send a drive signal to the drive mechanism; and the drive mechanism occasionally applies a force on the twisted flame member based on the drive signal programmed.

Preferably, the water and dust resistant artificial candle apparatus further comprises an aroma fragrance device, comprising a fan, a fragrance element and an airflow passage within the housing;

wherein, the air inlet of the airflow passage is positioned at the lower portion of the housing with extension supports to facilitate air inlet; the air outlet of the airflow passage is positioned at the upper portion of the housing; the fan is mounted along the airflow passage; the fragrance element is positioned between the fan and the air inlet of the airflow passage; and the control circuit is further adapted to energize the fan occasionally.

Preferably, the core module is mounted in a shell; the upper portion of the twisted flame member extends out of the shell through the opening of the blind hole; and the shell has a ventilation structure communicating with the outlet.

Preferably, the fan is a waterproof fan; the fan is surrounded with a guiding frame; and a bottom portion of -the guiding frame has an outlet communicating with the airflow passage.

Preferably, the twisted flame member includes a reflecting element and a pendulum element formed with the reflecting element integrally; the reflecting element is coupled on an upper portion of the pendulum element; the light source transmits a convergent light obliquely onto the reflecting element; the drive mechanism applies a force on the pendulum element occasionally; and a bottom surface of the pendulum element is larger than the opening of the blind hole; the twisted flame member is made of elastic materials; and the magnetic element is smaller than the opening of the blind hole.

Preferably, the water and dust resistant artificial candle apparatus further includes a vertical rod, a horizontal rod and an arc rod; the vertical rod, the horizontal rod and arc rod are made of elastic material integrally; a sidewall of the blind hole has a holding groove for holding the arc rod; the pendulum element has a cavity whose sidewall has a gap; a top wall of the cavity is positioned on an upper portion of the vertical rod; a lower portion of the vertical rod is positioned on a portion of the horizontal rod; and the other portion of the horizontal rod extends out of the cavity through the gap and connects with a portion of the arc rod; and the arc rod is mounted in the holding groove.

Preferably, a magnetic member is mounted on a bottom wall of the cavity; the drive mechanism includes a magnetic coil mounted directly below the pendulum element; the control circuit is adapted for supplying power to the magnetic coil occasionally, so that the magnetic coil applies a magnetic force onto the magnetic member occasionally.

Preferably, a slot is constructed on the bottom wall of the blind hole; the magnetic coil is mounted on a supporting plate; and the supporting plate and the magnetic coil are mounted in the slot.

Preferably, the housing includes a battery box and a supporting member for holding the twisted flame member; the supporting member is beyond the battery box; the battery box includes a box body and a box cover; a battery supplying power for the control circuit and a drive mechanism is mounted in the battery box; the box cover is hermetically mounted on the box body by a first seal; and the hermetically sealed lamp-holding hole and the blind hole are positioned on the supporting member.

Preferably, the housing includes a charging base under the battery box; the box cover is positioned in the bottom wall of the housing; the inlet of the airflow passage is positioned in the bottom wall of the housing; an inlet cover is mounted in the inlet; the inlet cover has intake holes; and the inlet communicates with external environment through the inlet cover.

Preferably, the number of the batteries is set to be at least two, and the two batteries are arranged side by side to each other, or one on top of another.

Preferably, the supporting member has the lamp-holding hole obliquely laying near the twisted flame member; a condensing lens is hermetically mounted on an upper portion of the lamp-holding hole; and the light source is mounted in the lamp-holding hole and under the condensing lens.

Preferably, the supporting member has a space therein, and comprises a front housing and a back housing buckled with the front housing hermetically.

Preferably, the shell includes an outer shell and an inner shell mounted in the outer shell; the supporting member and the battery box are positioned in the inner shell; the inner shell is made of plastic material; the outer shell is made of wax or plastics; a circular rib surrounding the lamp-holding hole and the blind hole is formed on a top portion of the inner shell; a top portion of the outer shell has a through-hole where the circular rib is inserted; and the rib has a through-hole communicating with the air outlet horizontally.

Preferably, a second seal is mounted at the top surface of the supporting member; and a top portion of the second seal is hermitically connected with the inner shell.

Preferably, the control circuit is mounted externally on the battery box, and between the battery box and the inner shell.

Preferably, a removable power transformer is mounted in the lower portion of the shell; and the transformer is adapted to supply power to the control circuit, or power is supplied by a power storage device positioned inside the shell.

Beneficial effects of the present invention are as follows:

1. The light source and the twisted flame member are respectively mounted in the lamp-holding hole and the blind hole. The sealed structure will prevent water and other small objects from contacting with the drive mechanism and the control circuit. Water in the blind hole is contained; water flowing into the airflow passage is directed passed the guiding frame and out through the air inlet cover at the bottom of the apparatus. The control circuit and the drive mechanism are kept protected, playing a part in short circuit protection, increasing work time and thus having a good waterproof effect. The candle apparatus is hence suitable for use in places where water or other foreign objects may cause damage to the apparatus such as in an outdoor environment.

2. The twisted flame member is programmed so that it would sway only occasionally, like a real combustible candle would. The airflow generated by the fan occasionally would cause the twisted flame member to sway naturally; the drive mechanism periodically applies a force on the pendulum element would also make the twisted flame member sway slightly and occasionally. The combination of the mechanically and electrically generated forces creates a natural and unpredictable flame movement. The movement of the reflected light off the twisted flame member is fluid and non-uniform, simulating a natural flickering of a burning flame realistically. The movement of the twisted flame member occasionally causes a portion of the twisted flame member to face away from the light source causing a dark region on the reflecting surface of the twisted flame member. This dark region represents the dark region of a true candle flame. The combination of the movement of the twisted flame member, the changing intensity of the reflected light and the dark region created on the twisted flame member animates the fluidity of a real combustible candle flame realistically but without the high temperature that could start a fire.

3. When the fan operates, an aroma fragrance is emitted to promote relaxation and instill a sense of calmness. The aroma fragrance flows along the airflow passage from the aroma element, passed the guiding frame and up along the supporting member and through the air outlet to form an air vortex around the top of the twisted flame member. The air vortex drives the twisted flame member to sway naturally. When the twisted flame member sways, the light intensity distribution on the reflecting camber surface is changed, simulating a natural flickering of a burning flame realistically. The aroma fragrance and the natural animation of a real combustible candle flame promote a pleasant and relaxing mood.

4. The outlet of the airflow passage communicates with external environment through the ventilation structure. Specifically, the through-hole of the circular rib communicates with the outlet. Accumulated water in the blind hole could only flow into the airflow passage, but it is guided to flow out via the airflow passage without coming into contract with the electronics, promoting a good waterproof effect. The fan is waterproof and is not impacted by the water flowing past it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric view of some embodiments of an artificial candle apparatus. FIG. 2 is an isometric view of an artificial candle apparatus of FIG. 1 without an outer shell.

FIG. 3 is an isometric view of an artificial candle apparatus of FIG. 1 without an inner shell.

FIG. 4 is an isometric view of an artificial candle apparatus of FIG. 3 without a front housing and with a battery box.

FIG. 5 shows a cut-away perspective view of an artificial candle apparatus of FIG. 1. FIG. 6 shows an enlarged view of an artificial candle apparatus.

FIG. 7 shows a flow direction of an aroma fragrance emitted from an artificial candle apparatus of FIG. 5.

FIG. 8 shows a flow direction of water in an artificial candle apparatus of FIG. 5. FIG. 9 is an isometric view of other embodiments of an artificial candle apparatus, such as a candle votive.

FIG. 10 is an isometric view of some embodiments of an artificial candle apparatus without a shell, such as a candle taper.

FIG. 11 is another isometric view of an artificial candle apparatus, such as a candle taper.

FIG.12 is an isometric view of a second embodiment of a power connector of an artificial candle apparatus of FIG. 11. FIG.13 is an isometric view of a third embodiment of a power connector of an artificial candle apparatus of FIG. 11.

FIG. 14 is an isometric view of a fourth embodiment of a power connector of an artificial candle apparatus of FIG.1 1.

FIG. 15 is an isometric view of an interior structure of a transformer connected to an external high voltage power connector.

FIG. 16 is an isometric view of an interior structure of a transformer for connecting to an external low-voltage charging base.

FIG. 17 is an isometric view of a guiding frame.

FIG. 18 is an isometric view of the bottom portion of the housing.

1. shell; 101. outer shell; 102. inner shell; 103. circular rib; 104. through hole; 105. through hole; 106. Support; 2. core module; 21. housing; 211. blind hole; 212. lamp holding hole; 213. holding groove; 214. slot; 215. lamp holding hole; 216. condensing lens; 22. twisted flame member; 221. reflecting element; 222. pendulum element; 223. cavity; 224. gap; 225. magnetic member; 23. light source; 24. drive mechanism; 241. magnetic coil; 242. supporting plate; 25. control circuit; 3. vertical rod; 4. horizontal rod; 5. arc rod; 6. aroma fragrance device; 61. fan; 611. guiding frame; 612. air outlet; 62. airflow passage; 621. air inlet; 622. air outlet; 200. supporting member; 201. front housing; 202. back housing; 203. second seal; 300. battery box; 301. battery; 302. box body; 303. box cover; 304. rechargeable battery; 400. charging base; 401. power connector; 500. inlet cover; 501. intake holes; 600. voltage conversion circuit.

DETAILED DESCRIPTION OF THE PREFERED EMBODIMENTS

Referring to the FIG.l to FIG.8, the preferred embodiments of a water and dust resistant artificial candle apparatus include a core module 2, which includes a housing 21 , a twisted flame member 22, a light source 23, a drive mechanism 24 and a control circuit 25. A top portion of the housing 21 has a blind hole 211 and a lamp-holding hole 212 adjacent to the blind hole 211. The light source 23 is mounted in the lamp-holding hole 212 hermetically and transmits a convergent light obliquely onto the twisted flame member 22. A lower portion of the twisted flame member 22 is pivotally mounted in the blind hole 211. An upper portion of the twisted flame member 22 extends out of the housing 21 through the blind hole 211. The drive mechanism 24 is positioned under the bottom wall of the blind hole 211. The control circuit 25 is adapted for to send a drive signal to the drive mechanism 24. The drive mechanism 24 occasionally applies a magnetic force on the twisted flame member 22 based on the drive signal to make the twisted flame member sway occasionally.

The light source 23 transmits a convergent light obliquely onto the twisted flame member 22. The reflected light off the twisted flame member 22 is subtle. The control circuit 25 is adapted to control the light source 23 to conduct occasionally to flicker. The drive mechanism periodically applies a magnetic force on the pendulum element causing the flame twisted member to sway occasionally. The airflow from the airflow passage also periodically causes the twisted flame member to sway slightly and occasionally. The swaying of the subtle flickering reflected light off the twisted flame member simulates a natural flickering of a burning flame realistically. In addition, the light source 23 is mounted in the lamp-holding hole 212 hermetically. The sealed blind hole 211 prevents water from permeating the housing 21. The artificial candle apparatus has a good waterproof and dustproof effect, and can increase the work time of the apparatus.

In this embodiment, the light source 23 includes one or more convergent light emitting diodes; an end of those tubes defines a convex lens. In other embodiments, the light source 23 may include common light emitting diodes and convex lens mounted in front of the light emitting diodes.

In this embodiment, the twisted flame member 22 includes a reflecting element 221 and a pendulum element 222 formed with the reflecting element 221 integrally. The reflecting element 221 is coupled on an upper portion of the pendulum element 222. The light source 23 transmits a convergent light obliquely onto the reflecting element 221. The drive mechanism 24 applies a force on the pendulum element 222 occasionally. The reflecting element 221 has a twisted flame silhouette shape; the reflected light off this moving flame silhouette is fluid, simulating a natural flickering of a burning flame realistically. A bottom surface of the pendulum element 222 is larger than the opening of the blind hole 211 , preventing the twisted flame member 22 from falling out of the blind hole 21 1 when the candle apparatus is placed upside down.

As shown in FIG. 5 and FIG. 6, in order that the twisted flame member 22 stays in an upright position when actuated by the drive mechanism 24, the candle apparatus further includes a vertical rod 3, a horizontal rod 4 and an arc rod 5. The vertical rod 3, the horizontal rod 4 and the arc rod are formed with an elastic material integrally, so that a connection portion between the vertical rod 3 and the horizontal rod 4, and a connection portion between the horizontal rod 4 and the arc rod 5 may be elastic. The elastic material may be a plastic or a metal material or spring steel for making spring. A sidewall of the blind hole 21 1 has a holding groove 213 for holding the arc rod 5. The pendulum element 222 has a cavity 223 whose sidewall has a gap 224. A top wall of the cavity 223 is positioned on an upper portion of the vertical rod 3. A lower portion of the vertical rod 3 is positioned on a portion of the horizontal rod 4. The other portion of the horizontal rod 4 extends out of the cavity 223 through the gap 224, and connects with a portion of the arc rod 5. The arc rod 5 is mounted in the holding groove 213. When the twisted flame member 22 is actuated by the drive mechanism 24 to sway, the vertical rod 3, the horizontal rod 4 and the arc rod 5 cooperatively limit the twisted flame member 22 to move back and forth elastically, which improve a supporting effect, and makes the twisted flame member 22 sways freely and animate the moving flame realistically.

In this embodiment, a magnetic member 225 is mounted on a bottom wall of the cavity 223. The drive mechanism 24 includes a magnetic coil mounted in a slot 241 under the pendulum element 222. The magnetic coil 241 may be mounted on a supporting plate 242, or may be mounted independently, that is, not mounted on the supporting plate 242. The control circuit 25 is adapted for supplying power to the magnetic coil 241 occasionally, so that the magnetic coil 241 applies a magnetic force onto the magnetic member 225 occasionally to make the twisted flame member 22 sway randomly and naturally. In other embodiments, the pendulum element 222 is made of magnetic material, or the magnetic member 225 made of iron or lodestone is built in the bottom wall of the cavity 223. The twisted flame member 22 is made of elastic material. The magnetic member 225 is smaller than the opening of the blind hole 211, so that, the pendulum element 222 may be squeezed into the blind hole 211 with the magnetic member 225 during assembly. The pendulum element 222 restores deformation in the blind hole 211, and will not fall out of the blind hole 211.

To create a relaxation effect, in this embodiment, the candle apparatus further includes an aroma fragrance device 6, which includes a fan 61, a fragrance element (not shown) and an airflow passage within the housing 21. The air inlet 621 of the airflow passage 62 is positioned at the lower portion of the housing 21. The air outlet 622 of the airflow passage 62 is positioned at the upper portion of the housing 21. The fan 61 is positioned along the airflow passage 62. The fragrance element is positioned between the fan 61 and the air inlet 621 of the airflow passage 62. The control circuit 25 is further adapted to energize the fan 61 occasionally and control the light source 23 to conduct occasionally to flicker. When the fan 61 operates, airflow flows through the airflow passage 62 through the air inlet 621, and carries the aroma fragrance from the fragrance element into the outward atmosphere through the air outlet 622. The outlet 622 may be positioned on a top wall of the housing 21.

Alternatively, the candle apparatus may not have the aroma fragrance device 6, such as an embodiment of a small candle, like a candle votive, shown in FIG. 9, and embodiments of a candle taper shown in FIG. 10 and FIG. 11. These embodiments are designed to be water and dust resistance. As is shown in FIG. 5 and FIG. 6, the core module 2 is mounted in a shell 1. The upper portion of the twisted flame member 22 extends out of the shell 1 through the opening of the blind hole 211. The shell 1 has a ventilation structure communicating with the outlet 622. The ventilation structure may be a bent passage, or a structure with a water and dust resistant device for limiting water from flowing into the airflow passage 62. The bottom wall of the housing extends supports 106 (shown in FIG. 18). The extension supports play an important role in facilitating water to flow away from the base of shell 1. The fan 61 is a waterproof fan. Even though water permeates into the airflow passage 62, the fan 61 plays a part in waterproofing. Water can flow out of the bottom wall of the housing supported by the extension supports 106, such design solutions passing the dustproof and waterproof regulations for luminaries in IP44 (Ingress Protection 44) drafted by IEC (international electrotechnical commission). The said design solutions of blind hole 211 , lamp-holding hole 212, ventilation structure and the extension supports 106 can play a part in the dustproof and waterproof objective well. Shown in FIG. 18, waterproof components such as switch 107 are mounted at the bottom portion of the housing. The components are adapted for switching on or off the core module 2 and the aroma fragrance device 6.

As shown FIG. 17, the fan 61 is surrounded with a guiding frame 611 with an air inlet in a bottom wall thereof. Both the air inlet and the air outlet 612 communicate with the airflow passage 62. The height of the guiding frame 611 is configured corresponding to the varying height of the candle apparatus. The heights of the housing 200 and battery box 300 may remain unchanged.

As is shown in FIG. 5, FIG. 7 and FIG. 17, when the fan 61 operates, the airflow flows along the airflow passage 62 through the inlet 621, and further flows along the aroma fragrance device to bring out the aroma fragrance which flows through the outlet 612, the guiding frame 611, the air outlet 622 and the ventilation structure to reach out of the candle apparatus. Up arrows in the FIG. 17 show the flow direction of the aroma fragrance airflow through the outlet 612 of the guiding frame 61 1. As is shown in FIG. 8, if large amount of water flows into the ventilation structure and then reach the airflow passage 62 through the air outlet 622, water will gather in the guiding frame 61 1 , and then flows through the outlet 612, so that the water will not affect the operation of the fan 61. Eventually, water is drained out of the candle apparatus through the air inlet 621. Down arrows in FIG. 17 show the flow direction of the water through the outlet 612 of the guiding frame 611.

As is shown in FIG. 1 to FIG. 6, to guarantee a firm installation of the supporting plate 242 and the magnetic coil 241, a slot 214 is mounted on the bottom wall of the blind hole 211. The supporting plate 242 and the magnetic coil 241 are mounted in the slot 214. Holding the magnetic coil 241 steady will cause its magnetic fields to apply a force on the pendulum element 222 for the twisted flame member to swing freely.

In this embodiment, the housing 21 includes a battery box 300 and a supporting member 200 for holding the twisted flame member 22; the supporting member 200 is beyond the battery box 300. The battery box 300 includes a box body 302 and a box cover 303 (shown in FIG. 3 and FIG. 18). A battery 301 supplying power for control circuit 25 and a drive mechanism 24 is mounted in the battery box 300. The box cover 303 is hermetically mounted on the box body 302 by a first seal (not shown), preventing water from wetting the battery 301. The lamp-holding hole 212 and the blind hole 211 are positioned on the supporting member 200.

Preferably, the housing 21. includes a charging base 400 under the batteiy box 300. The removable charging base 400 may be connected with the housing 21 , and further connected with the rechargeable battery 304 via a charging circuit. The box cover is positioned at the bottom wall of the housing. Shown in FIG. 18, the air inlet 621 of the airflow passage 62 is positioned at the bottom wall of the housing. An inlet cover 500 is mounted in the inlet 621. The inlet cover 500 has intake holes 501. The air inlet 621 communicates with external environment through the inlet cover 500, When the fan 61 operates, the airflow flows into the airflow passage 62 through intake holes 501. In addition, even if the airflow passage 62 has water, the water will drain quickly through the intake holes 501. Powered by the battery 301 , the candle apparatus can be portable, and the battery 301 makes full use of the space within shell 1. As is shown in FIG. 4, the number of the batteries is set to be two, and the two batteries are arranged horizontally. Alternatively, the number of the batteries may be set as more than two if needed. Such an installation enlarges the volume of the shell 1 and lowers the center of gravity of the shell 1 , which stabilizes the candle apparatus. The batteries 301 arranged horizontally are shown in the candle votive of FIG. 9. The candle votive may have a battery 301 or rechargeable battery 304.

In other embodiments, as shown in FIG. 10, FIG. 1 1 and FIG. 16, power supply may be arranged coaxially and vertically, shaping the shell 1 into a long tube to form the candle taper lamp. In FIG. 10 batteries 301 are arranged in series inside a battery holder (not shown) inside the battery box 300. In FIG. 11, a removable high to low voltage power transformer 404 mounted inside shell 1 , may be adapted to directly supply power to the control circuit 25. In FIG. 16, a removable rechargeable battery positioned inside shell 1 may also be adapted to supply power to the control circuit 25. As shown in FIG. 16, the rechargeable battery 304 may be connected to an external charger (not shown) for charging purposes. Conductive members (not shown) on an upper portion of the transformer 401 or battery holder are adapted for connecting with the control circuit electrically. The conductive member may be a wire, a cylinder or a spring or locking. As shown in FIG. 15, when the power adaptor is connected with a high voltage power source, a high voltage is supplied to the control circuit 25 via the transformer. Specifically, the transformer supplies power to the control circuit 25 via a voltage conversion circuit 600. As shown in FIG. 11 to FIG. 14, the power adaptor 401 can be any standard adaptor. As shown in FIG. 4 to FIG. 6, to improve the water and dust resistant effect, the supporting member 200 has a lamp-holding hole 215 obliquely laying near the twisted flame member 22. A condensing lens 216 is hermetically mounted on an upper portion of the lamp-holding hole 21 . The light source 23 is mounted in the holding hole 215 and under the condensing lens 216, and the condensing lens is hermetically sealed.

To facilitate the injection mould and assembly of the supporting member 200, the supporting member 200 is hollow, and includes a front housing 201 and a back housing 202 buckled with the front housing 201 hermetically.

As shown in FIG. 1 to FIG. 5, the shell 1 includes an outer shell 101 and an inner shell 102 mounted in the outer shell 101. The supporting member 200 and the battery box 300 are positioned in the inner shell 102. The inner shell 102 is made of plastic material. The outer shell 101 is made of wax, plastics or other environmentally friendly materials. . A circular rib 103 surrounding the lamp-holding hole 212 and the blind hole 211 is formed on a top portion of the inner shell 102. A top portion of the outer shell 101 has a through-hole 104 where the circular rib 103 is inserted. The rib 103 has a through-hole 105 communicating with the outlet 622 horizontally. The structure of the through-hole 105 may be formed to be the said ventilation structure. Water flows into the airflow passage 62 through the through-hole 104, the rib 103 and the bending through-hole 105. The bending through- hole 105 can minimize water from flowing into the airflow passage 62 to some extent.

Alternatively, the shell 1 may just have a single piece having the same function as the inner shell 102 and the outer shell 101.

As shown in FIG. 3 and FIG. 4, a second seal 203 is mounted in a top surface of the supporting member 200. A top portion of the second seal 203 is hermitically connected with the inner shell 102, preventing water from flowing outside the airflow passage 62 through a gap between the supporting member and the inner shell 102.

As shown in FIG. 3 and FIG. 4, the control circuit 25 is mounted on the battery box 300, and between the battery box 300 and the inner shell 102, making full use of the space between the shell 1 and the housing 21, to reduce the volume of shell 1 as small as possible and to facilitate material saving and cost saving. The control circuit 25 is also mounted at a location where it is protected from water that may shorten the work time.

While the present disclosure has been described with reference to particular embodiments, the description is not to be construed as limiting the disclosure. Therefore, those of ordinary skill in the art could make various modifications to the embodiments without departing from the true spirit and scope of the disclosure.