A flashlight with adjustable focus

Abstract

The application relates to the field of flashlights, in particular to a flashlight with adjustable focal length, which comprises a flashlight main body, a distance adjusting mechanism, a connecting mechanism and a protection mechanism, wherein the flashlight main body is used for bearing a battery to provide power support for the flashlight; the distance adjusting mechanism is arranged on the outer side of the flashlight main body and is used for adjusting the focusing state of a light source to realize focal length adjustment; the connecting mechanism is arranged on the distance adjusting mechanism, and the protection mechanism is arranged on the outer side of the distance adjusting mechanism, and the two are linked and matched; the protection mechanism is used for protecting a lens, and the connecting mechanism is used for improving the connection stability of the protection mechanism and the distance adjusting mechanism; the distance adjusting mechanism comprises an inner thread sleeve and an adjusting knob; the inner thread sleeve is threadedly connected to the outer side of the flashlight main body, and the flashlight with automatic focal length adjustment can directly push an inserting plate to quickly complete coarse positioning through a double focal length adjustment mode of 'coarse adjustment + fine adjustment', and then realizes accurate fine adjustment by rotating the adjusting knob.

Description

Technical Field

[0001] This invention relates to the field of flashlight technology, specifically to an adjustable focus flashlight. Background Technology

[0002] As a portable lighting tool, flashlights are suitable for civilian scenarios such as daily travel and emergency lighting, and also play an important role in industrial and mining fields. Small flashlights that can be used with safety helmets are gradually becoming an industry necessity. These flashlights need to be quick to attach to safety helmets, have a lighting angle adapted to the work environment, and be easy to operate. Different scenarios have significantly different requirements for lighting effects. For example, long-distance outdoor illumination requires focused, strong light, while close-range inspection requires diffused, soft light. This necessitates flashlights with flexible, adjustable focal lengths, allowing for precise adaptation of the light range and intensity by changing the distance between the light source and the optical lenses.

[0003] Currently, most flashlights with focus adjustment functions in the industry use a single screw-type rotary focusing or sliding focusing structure; the assembly of the lamps mainly relies on snap-fit ​​or screw connections. While these traditional structures can meet basic focusing and assembly needs, as users' requirements for ease of operation, focusing accuracy, and assembly stability continue to increase, many shortcomings have gradually become apparent. For example, a single focusing method cannot simultaneously achieve both adjustment efficiency and accuracy, and traditional assembly structures are prone to problems such as loose connections and insufficient protection. Especially when used in complex environments, these defects can seriously affect the user experience and reliability of the flashlight. Therefore, there is an urgent need to develop an improved structure that integrates dual-stage focusing, stable assembly, and protection to enhance the overall performance of flashlights. Summary of the Invention

[0004] The present invention provides an adjustable focus flashlight to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable focus flashlight, comprising a flashlight body for carrying a battery and providing power support for the flashlight's operation; The focusing mechanism, located on the outside of the flashlight body, is used to adjust the focusing state of the light source and achieve focus adjustment. The system includes a connecting mechanism and a protective mechanism. The connecting mechanism is mounted on the adjusting mechanism, and the protective mechanism is located outside the adjusting mechanism. The two mechanisms work together in conjunction. The protective mechanism is used to protect the lens, and the connecting mechanism is used to improve the connection stability between the protective mechanism and the adjusting mechanism. The focal length adjustment mechanism includes an internal threaded sleeve and an adjustment knob; the internal threaded sleeve is threaded to the outside of the flashlight body, and the adjustment knob is fixedly installed on the outside of the internal threaded sleeve; by rotating the adjustment knob, the internal threaded sleeve is driven to move along the axial direction of the flashlight body, which in turn drives the lens in the protective mechanism to move forward synchronously, thereby realizing focal length adjustment.

[0006] Preferably, an insert plate is inserted into the outer end face of the adjustment knob, and a trapezoidal groove is formed on the top of the insert plate; an insert rod is inserted into the outer side of the adjustment knob, and a slider is fixedly connected to the outer side of the insert rod to realize the sliding adaptation and positioning of the insert rod and the adjustment knob.

[0007] Preferably, a bearing is rotatably connected to the outer side of the insertion rod, and a spring is fixedly connected to the side of the bearing away from the insertion rod; the end of the spring away from the bearing is fixedly connected to the adjustment knob to provide elastic restoring force for the insertion rod.

[0008] Preferably, the adjustment knob has an L-shaped groove inside, which is adapted to slide with the slider to limit the movement trajectory of the insertion rod; The bottom of the insertion rod is fixedly connected to a No. 2 bearing, and a bottom curved head is rotatably installed at the bottom of the No. 2 bearing; the bottom of the bottom curved head fits into the trapezoidal groove, and the insertion plate and the adjustment knob are locked together through the cooperation of the trapezoidal groove and the bottom curved head.

[0009] Preferably, the connecting mechanism includes a limiting plate, which is fixedly connected to the upper and lower sides of the insert plate. The top of the insert plate has a through groove, and the inner side of the through groove has a notch. A second magnetic block is fixedly connected in the notch. A support shaft seat is provided inside the groove, and a connecting shaft is fixedly connected inside the support shaft seat. A deflection plate is rotatably installed on the outside of the connecting shaft.

[0010] Preferably, a first magnetic block is fixedly connected to the outer side of the deflection plate, and the first magnetic block and the second magnetic block cooperate to achieve magnetic positioning of the deflection plate. A second spring is fixedly connected to the side of the deflection plate away from the first magnetic block to provide elastic restoring force for the deflection plate. The top of the deflection plate is provided with a sliding groove, and a No. 1 sliding plate is adapted to slide within the sliding groove.

[0011] Preferably, a fixing rod is provided in the groove, and an arc-shaped seat is fixedly connected to the outer end face of the fixing rod. A bladder is fixedly connected to the outer side of the arc-shaped seat. An air tube is fixedly connected to the center of both the bladder and the arc-shaped seat. The air tube is connected to the bladder to realize gas transmission.

[0012] Preferably, the inner sliding adapter of the arc-shaped seat is equipped with a second sliding plate, the bottom of the second sliding plate is fixedly connected to a bottom connecting block, the outer side of the bottom connecting block is fixedly connected to a spring strip, and the end of the spring strip away from the bottom connecting block is fixedly connected to the first sliding plate.

[0013] Preferably, the protective mechanism includes a lamp, the lamp having a convex lens inside for focusing light, and locking rings on both sides of the convex lens. The locking rings are fixedly connected to the inner side of the lamp for positioning and fixing the convex lens, and an annular bladder is fixedly connected inside the locking rings to enhance the sealing of the convex lens installation. The outer end face of the lamp fits into the insert plate, and the outer end face of the lamp is fixedly connected to the fixing rod and the support seat respectively. The gas pipe passes through the insert plate and the lamp in sequence and is connected to the outer pipe to form a complete gas flow channel.

[0014] Preferably, an air groove is provided on the outer side of the lamp, and an outer pipe is fixedly connected to the outer side of the lamp. The two ends of the air groove are respectively connected to the annular bladder and the outer pipe to realize gas conduction between the annular bladder and the outer pipe. A cylinder is fixedly installed on the outer end face of the outer tube. A piston rod is slidably fitted to the end of the cylinder away from the outer tube. By pushing the piston rod, the air pressure in the annular bladder can be adjusted to achieve the clamping protection of the convex lens.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Supports dual focus adjustment modes of "coarse adjustment + fine adjustment". Coarse adjustment can be quickly completed by simply pushing the plate, and precise fine adjustment can be achieved by rotating the adjustment knob. The adjustment method is flexible and the accuracy is controllable. By changing the distance between the light source and the convex lens, it can adapt to the focus requirements of different lighting scenarios and improve the applicability of lighting.

[0016] 2. The deflection plate and the sliding plate are driven by magnetic attraction to achieve the initial connection of the lamp. Then, the ring bladder is driven by gas to inflate and complete the sealing and fastening, forming a double fixation of "magnetic positioning + air expansion locking". The connection is firm and the sealing is good. The assembly process does not require complicated tools and the steps are simple, which improves the efficiency of lamp assembly and disassembly.

[0017] 3. While the air expands and locks, the bulging of the annular bladder can effectively protect the outer ring of the convex lens, preventing external impacts or impurities from damaging the optical components; the filling of the slot by the bladder not only strengthens the connection stability, but also buffers the contact stress between the lamp and the plate, reduces component wear, and extends the service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of an adjustable focus flashlight according to the present invention.

[0019] Figure 2 This is a cross-sectional view of the flashlight of the present invention.

[0020] Figure 3 This is a schematic diagram of the adjusting mechanism of the present invention.

[0021] Figure 4 This is a cross-sectional view of the adjusting mechanism of the present invention.

[0022] Figure 5 This is a cross-sectional enlarged structural diagram of the bottom curved head in the adjusting mechanism of the present invention.

[0023] Figure 6 This is a cross-sectional view of the connecting mechanism of the present invention.

[0024] Figure 7 This is a cross-sectional view of the connecting mechanism of the present invention.

[0025] Figure 8 This is a cross-sectional enlarged structural diagram of the sliding plate in the connecting mechanism of the present invention.

[0026] Figure 9 This is a schematic diagram of the protective mechanism of the present invention.

[0027] Figure 10 This is a full cross-sectional structural diagram of the protective mechanism of the present invention.

[0028] Figure 11 This is a cross-sectional enlarged structural diagram of the annular bladder in the protective mechanism of the present invention.

[0029] Figure 12 This is a cross-sectional enlarged structural diagram of the trachea of ​​the present invention.

[0030] In the picture: 1. Flashlight body; 2. Adjustment mechanism; 3. Connecting mechanism; 4. Protective mechanism; 21. Internal threaded sleeve; 22. Adjusting knob; 23. Insert plate; 24. Trapezoidal groove; 25. Insert rod; 26. Bearing No. 1; 27. Spring No. 1; 28. L-shaped groove; 29. ​​Slider; 20. Bearing No. 2; 201. Bottom curved head; 31. Limiting plate; 32. Support bearing; 33. Deflection plate; 34. Magnetic block No. 1; 35. Spring No. 2; 36. Magnetic block No. 2; 37. Slide plate No. 1; 38. Fixing rod; 39. Arc-shaped seat; 30. Slide plate No. 2; 301. Bottom connecting block; 302. Spring bar; 303. Bag body; 304. Through groove; 305. Air tube; 41. Light fixture; 42. Convex lens; 43. Locking ring; 44. Annular bladder; 45. Air groove; 46. External pipe; 47. Cylinder; 48. Piston rod. Detailed Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1 to 12 The present invention provides a technical solution: an adjustable focus flashlight. Example

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 9 As shown, the flashlight body 1 serves as the supporting foundation of the overall structure, with a pre-reserved battery mounting cavity inside for placing the power supply battery and providing stable power support for the flashlight's operation. The flashlight body 1 has external threads on its outer side. The adjustment mechanism 2 is assembled on the outer front end of the flashlight body 1, and its core consists of an internally threaded sleeve 21 and an adjustment knob 22. The internally threaded sleeve 21 has internal threads on its inner side, precisely connecting with the external threads on the outer side of the flashlight body 1. The adjustment knob 22 is fixedly installed on the outer side of the internally threaded sleeve 21 by welding, forming an integrated transmission structure. Rotating the adjustment knob 22 synchronously drives the internally threaded sleeve 21 to move back and forth along the axial direction of the flashlight body 1.

[0034] Based on the initial focal length requirements of the usage scenario, the operator can directly push the insert plate 23 forward. The insert plate 23 drives the lamp 41 and the internal convex lens 42 to move forward synchronously, changing the distance between the convex lens 42 and the light source inside the flashlight body 1, thereby achieving coarse focal length adjustment. During the coarse adjustment process, the insert plate 23 slides along the insertion slot on the outer end face of the adjustment knob 22.

[0035] The outer end face of the adjustment knob 22 has a slot for insertion, and the insert plate 23 is slidably inserted into the slot to achieve initial positioning with the adjustment knob 22. The top of the insert plate 23 has a trapezoidal groove 24 along its length for pressing and fitting with the bottom curved head 201 of the locking component. The outer side of the adjustment knob 22 has a through hole corresponding to the position of the insert plate 23, and the insert rod 25 is slidably inserted into the through hole. The outer side of the insert rod 25 is fixedly connected to the slider 29 by bolts. The inner side of the adjustment knob 22 has an L-shaped groove 28 corresponding to the position of the slider 29. The slider 29 is slidably fitted into the L-shaped groove 28. The vertical and horizontal sections of the L-shaped groove 28 limit the "downward-rotational" movement trajectory of the insert rod 25, thereby achieving sliding fitting and locking positioning of the insert rod 25.

[0036] A bearing 26 is fixedly connected to the outer side of the insertion rod 25 via an interference fit with the inner ring. The outer ring of the bearing 26 is welded to one end of a spring 27, and the other end of the spring 27 is welded to the inner cavity wall of the adjusting knob 22. The spring 27 is sleeved on the outer side of the insertion rod 25 and is in a naturally extended state in the initial state, providing an upward elastic restoring force for the insertion rod 25. A bearing 20 is fixedly connected to the bottom of the insertion rod 25 via an interference fit with the inner ring. A bottom curved head 201 is rotatably mounted on the outer ring of the bearing 20. The bottom of the bottom curved head 201 is a trapezoidal structure adapted to the trapezoidal groove 24, which can fit and be squeezed into the trapezoidal groove 24. The cooperation of the two realizes the locking and fixing of the insertion plate 23 and the adjusting knob 22.

[0037] After coarsely adjusting to the preset approximate focal length, a locking operation is performed: Press down on the insertion rod 25, causing the slider 29 to slide downwards along the vertical section of the L-shaped groove 28, while simultaneously compressing the first spring 27 to contract and store elastic restoring potential energy; during the downward movement of the insertion rod 25, its bottom curved head 201, connected via the second bearing 20, moves downwards synchronously until the trapezoidal structure of the bottom curved head 201 is pressed and fitted with the trapezoidal groove 24 at the top of the insertion plate 23, forming a preliminary fitting and positioning. Then, rotate the insertion rod 25 clockwise, causing the slider 29 to deflect along the horizontal section of the L-shaped groove 28. The horizontal section of the L-shaped groove 28 forms an axial limit on the slider 29, preventing the insertion rod 25 from resetting upwards; at this time, the bottom curved head 201 rotates synchronously and locks within the trapezoidal groove 24, achieving the locking of the insertion rod 25 and the limiting and fixing of the insertion plate 23. The insertion plate 23 can no longer move axially, completing the locking after coarse focal length adjustment.

[0038] After coarse adjustment and locking, fine focus adjustment is achieved by rotating the adjustment knob 22. Rotating the adjustment knob 22 forward causes the internal threaded sleeve 21, which is fixedly connected to it, to rotate synchronously. Since the internal threaded sleeve 21 is threadedly connected to the flashlight body 1, rotation is converted into axial movement. The internal threaded sleeve 21 moves forward along the flashlight body 1, and through the adjustment knob 22 and the insert plate 23, it drives the protective mechanism 4 and the internal convex lens 42 to move forward synchronously, further reducing the distance between the light source and the convex lens 42, achieving precise focusing. Rotating the adjustment knob 22 in the opposite direction causes the internal threaded sleeve 21 to move backward along the flashlight body 1, driving the convex lens 42 to move backward synchronously, increasing the distance between the light source and the convex lens 42, achieving precise focusing. By controlling the rotation angle of the adjustment knob 22, the displacement of the convex lens 42 can be precisely controlled, achieving fine-tuned focus adjustment until the ideal focusing effect is achieved, at which point the flashlight can be turned on for illumination. Example

[0039] like Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, the connecting mechanism 3 is integrated between the insert plate 23 and the protective mechanism 4 to enhance the connection stability between the two. The upper and lower sides of the insert plate 23 are fixedly connected to the limiting plate 31 by welding. The top of the insert plate 23 is provided with a through groove 304. The inner side of the through groove 304 is symmetrically provided with notches. The second magnetic block 36 is fixedly connected to the notch by adhesive. The limiting plate 31 is used to limit the range of the bulge of the bladder 303, so that the bulging bladder 303 fills the circular groove of the through groove 304.

[0040] A support seat 32 is fixedly installed inside the slot 304. A connecting shaft is fixedly connected inside the support seat 32 via an interference fit. A deflection plate 33 is rotatably mounted on the outer side of the connecting shaft via a bearing. The deflection plate 33 can freely deflect around the connecting shaft. A first magnetic block 34 is glued and fixedly connected to the outer side of the deflection plate 33 at the position corresponding to the second magnetic block 36. The first magnetic block 34 and the second magnetic block 36 have opposite magnetic poles and can generate magnetic attraction to achieve magnetic positioning of the deflection plate 33. The side of the deflection plate 33 away from the first magnetic block 34 is welded and fixed to one end of a second spring 35. The other end of the second spring 35 is welded and fixed to the inner wall of the slot 304. In the initial state, the second spring 35 is in a naturally contracted state, providing a reverse elastic restoring force for the deflection plate 33. A sliding groove is formed on the top of the deflection plate 33, and a first sliding plate 37 is slidably fitted inside the groove, allowing the first sliding plate 37 to slide smoothly along the groove.

[0041] A fixing rod 38 is also provided inside the slot 304. An arc-shaped seat 39 is fixedly connected to the outer end face of the fixing rod 38 by welding. A bladder 303 is fixedly connected to the outer side of the arc-shaped seat 39 by adhesive bonding. The bladder 303 is an elastic sealing structure. An air tube 305 is fixedly connected through the center of the arc-shaped seat 39 and the bladder 303. The air tube 305 communicates with the inside of the bladder 303 to form a gas transmission channel. A sliding cavity is opened inside the arc-shaped seat 39. The sliding cavity communicates with the slot 304. A second sliding plate 30 is slidably fitted inside the sliding cavity. A bottom contact block 301 is fixedly connected to the bottom of the second sliding plate 30 by welding. A spring strip 302 is fixedly connected to the outer side of the bottom contact block 301 by welding. The end of the spring strip 302 away from the bottom contact block 301 is welded and fixedly connected to the first sliding plate 37 to realize the linkage between the deflection plate 33 and the second sliding plate 30.

[0042] During the insertion of the insert plate 23 and the lamp 41, the first magnetic block 34 on the outer side of the deflection plate 33 and the second magnetic block 36 in the notch of the slot 304 attract each other, generating an outward magnetic attraction. Under the action of the magnetic attraction, the deflection plate 33 deflects outward around the connecting shaft in the support seat 32, while stretching the second spring 35 to store its elastic restoring potential energy. When the deflection plate 33 deflects, the first sliding plate 37 in its top sliding groove slides synchronously, transmitting the pulling force to the bottom connecting block 301 through the spring strip 302, causing the bottom connecting block 301 to move outward. The bottom connecting block 301 causes the second sliding plate 30 to extend to both ends along the sliding cavity of the arc seat 39. The extended second sliding plate 30 slides and adapts to the circular groove section inside the slot 304, forming a multi-point support with the deflected deflection plate 33, realizing the initial connection and positioning of the lamp 41 and the insert plate 23. Example

[0043] like Figure 3 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the core of the protective mechanism 4 is the lamp 41, which houses a convex lens 42. The convex lens 42 is used to focus the light source and adjust the focal length. Locking rings 43 are provided on both sides of the convex lens 42, and are threadedly fixed to the inside of the lamp 41 to position and fix the axial position of the convex lens 42, preventing displacement. An annular bladder 44 is bonded to the inside of the locking ring 43, and surrounds the edge of the convex lens 42 to enhance the sealing of the convex lens 42 during installation.

[0044] The outer end face of the lamp 41 is provided with a fitting groove that fits into the insert plate 23, allowing it to fit snugly into the insert plate 23. Simultaneously, the outer end face of the lamp 41 is fixedly connected to the fixing rod 38 and the support seat 32 by bolts, achieving a rigid connection with the connecting mechanism 3. An air groove 45 is provided on the outer side of the lamp 41, one end of which communicates with the annular bladder 44. An outer connecting pipe 46 is fixedly connected to the outer side of the lamp 41 by threads, one end of which communicates with the air groove 45, and the other end is fixedly connected to the cylinder 47. A piston rod 48 is slidably fitted to the end of the cylinder 47 away from the outer connecting pipe 46. Pushing the piston rod 48 can force the gas inside the cylinder 47 into the outer connecting pipe 46, forming a complete gas drive circuit. The end of the air pipe 305 away from the bladder 303 passes through the insert plate 23 and the lamp 41 sequentially, communicating with the interior of the outer connecting pipe 46, allowing gas to be simultaneously delivered to the bladder 303 and the annular bladder 44.

[0045] Align the fitting groove on the outer end face of the lamp 41 with the insert plate 23, and push the lamp 41 so that the insert plate 23 is inserted into the fitting groove. At this time, the support seat 32, fixing rod 38 and other components of the connecting mechanism 3 simultaneously extend into the through groove 304 on the top of the insert plate 23, completing the initial insertion and adaptation of the lamp 41 and the insert plate 23.

[0046] The operator manually pushes the piston rod 48 into the cylinder 47. The piston rod 48 compresses the gas inside the cylinder 47, causing the gas to be output through the outer pipe 46 and divided into two streams: one stream of gas enters the annular bladder 44 through the gas groove 45 on the outside of the lamp 41, pushing the annular bladder 44 to inflate. The inflated annular bladder 44 tightly fits the edge of the convex lens 42 and the inner wall of the locking ring 43, achieving a sealing and reinforcement of the mounting part of the convex lens 42, while forming a flexible compression protection for the convex lens 42 to prevent its vibration and displacement; the other stream of gas enters the bladder 303 through the gas pipe 305, pushing the bladder 303 to inflate. The inflated bladder 303 fills the gap of the entire through groove 304, wrapping and fixing the support seat 32, deflection plate 33, fixing rod 38 and other components inside the through groove 304, further strengthening the connection stability between the lamp 41 and the insert plate 23, while also achieving a dustproof seal at the connection. After the gas is pushed in, keep the piston rod 48 in the pushed-in state to ensure that the bladder 303 and the annular bladder 44 remain in a bulging and sealed state.

[0047] The working principle of this invention is as follows: First, the adjustment knob 22 is rotated counterclockwise. The adjustment knob 22 will drive the internal threaded sleeve 21, which is fixedly connected to it, to rotate synchronously, so that the internal threaded sleeve 21 moves forward along the flashlight body 1, thereby driving the protective mechanism 4, which is fixedly connected to the insert plate 23, to move synchronously. The convex lens 42 inside the protective mechanism 4 moves forward together. The focal length is adjusted by changing the distance between the light source and the convex lens 42.

[0048] Secondly, the operator can push the insert plate 23 forward directly to complete the coarse focus adjustment without rotating the adjustment knob 22. After the coarse adjustment is completed, press down on the insert rod 25 to move the slider 29 down along the vertical groove of the L-shaped groove 28 and compress the first spring 27. The bottom curved head 201, which is connected to the bottom end of the insert rod 25 through the second bearing 20, will be pressed and fitted into the trapezoidal groove 24 opened at the top of the insert plate 23. Then, rotate the insert rod 25 clockwise to deflect the slider 29 along the horizontal groove of the L-shaped groove 28, thereby locking the insert rod 25 and limiting and fixing the insert plate 23. After the above operations, the insert plate 23 has completed the coarse focus adjustment and is locked and cannot be moved. The fine focus adjustment can then be achieved by rotating the adjustment knob 22.

[0049] Furthermore, when the lamp 41 is plugged into the socket 23, the connecting mechanism 3 extends into the slot 304 at the top of the socket 23. At this time, the first magnetic block 34 and the second magnetic block 36 generate a magnetic attraction, driving the deflection plate 33 to deflect outward around the shaft in the support seat 32. The first sliding plate 37, which is slidably fitted to the top of the deflection plate 33, drives the bottom connecting block 301 to move outward synchronously through the spring bar 302, so that the second sliding plate 30 at the top of the bottom connecting block 301 extends outward from the arc-shaped seat 39 and slides into the circular slot of the slot 304. The extended second sliding plate 30 and the deflected deflection plate 33 together achieve the initial connection between the lamp 41 and the socket 23.

[0050] In addition, the operator manually pushes the piston rod 48 into the cylinder 47, allowing the gas in the cylinder 47 to enter the outer pipe 46; then the gas in the outer pipe 46 is divided into two streams, one stream enters the annular bladder 44 through the gas groove 45, causing the annular bladder 44 to bulge, thus protecting the outer ring contour of the convex lens 42; the other stream of gas enters the bladder 303 through the gas pipe 305, causing the bladder 303 to bulge and fill the entire through groove 304, finally completing the stable connection between the lamp 41 and the plug plate 23.

[0051] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made by those skilled in the art based on the above concepts without creative effort shall fall within the scope of protection of the present invention.

Claims

1. A flashlight with adjustable focus, characterized in that, include: The main body of the flashlight, used to hold the battery; The focusing mechanism, located on the outside of the flashlight body, is used to adjust the focusing state of the light source and achieve focus adjustment. The system includes a connecting mechanism and a protective mechanism. The connecting mechanism is mounted on the adjusting mechanism, and the protective mechanism is located outside the adjusting mechanism. The two mechanisms work together in conjunction. The protective mechanism is used to protect the lens, and the connecting mechanism is used to improve the connection stability between the protective mechanism and the adjusting mechanism. The focal length adjustment mechanism includes an internal threaded sleeve and an adjustment knob; the internal threaded sleeve is threaded to the outside of the flashlight body, and the adjustment knob is fixedly installed on the outside of the internal threaded sleeve; by rotating the adjustment knob, the internal threaded sleeve is driven to move along the axial direction of the flashlight body, which in turn drives the lens in the protective mechanism to move forward synchronously, thereby realizing focal length adjustment.

2. The adjustable focus flashlight according to claim 1, characterized in that: An insert plate is inserted into the outer end face of the adjustment knob, and a trapezoidal groove is formed on the top of the insert plate; an insert rod is inserted into the outer side of the adjustment knob, and a slider is fixedly connected to the outer side of the insert rod to realize the sliding adaptation and positioning of the insert rod and the adjustment knob.

3. The adjustable focus flashlight according to claim 2, characterized in that: A bearing is rotatably connected to the outer side of the insertion rod, and a spring is fixedly connected to the side of the bearing away from the insertion rod. The end of the spring away from the bearing is fixedly connected to the adjustment knob to provide elastic restoring force for the insertion rod.

4. A flashlight with adjustable focus according to claim 2, characterized in that: The adjustment knob has an L-shaped groove inside, which is adapted to slide with the slider to limit the movement trajectory of the insertion rod; The bottom of the insertion rod is fixedly connected to a No. 2 bearing, and a bottom curved head is rotatably installed at the bottom of the No. 2 bearing; the bottom of the bottom curved head fits into the trapezoidal groove, and the insertion plate and the adjustment knob are locked together through the cooperation of the trapezoidal groove and the bottom curved head.

5. A flashlight with adjustable focus according to claim 2, characterized in that: The connecting mechanism includes a limiting plate, which is fixedly connected to the upper and lower sides of the insert plate. The top of the insert plate has a through groove, and the inner side of the through groove has a notch. A second magnetic block is fixedly connected in the notch. A support shaft seat is provided inside the groove, and a connecting shaft is fixedly connected inside the support shaft seat. A deflection plate is rotatably installed on the outside of the connecting shaft.

6. A flashlight with adjustable focus according to claim 5, characterized in that: A first magnetic block is fixedly connected to the outer side of the deflection plate. The first magnetic block and the second magnetic block cooperate to achieve magnetic positioning of the deflection plate. A second spring is fixedly connected to the side of the deflection plate away from the first magnetic block to provide elastic restoring force for the deflection plate. The top of the deflection plate is provided with a sliding groove, and a No. 1 sliding plate is slidably fitted inside the sliding groove.

7. A flashlight with adjustable focus according to claim 5, characterized in that: A fixing rod is provided in the groove, and an arc-shaped seat is fixedly connected to the outer end face of the fixing rod. A bladder is fixedly connected to the outer side of the arc-shaped seat. An air tube is fixedly connected to the center of both the bladder and the arc-shaped seat. The air tube is connected to the bladder to realize the transmission of gas.

8. A flashlight with adjustable focus according to claim 7, characterized in that: The inner sliding adapter of the arc-shaped seat is equipped with a second sliding plate. The bottom of the second sliding plate is fixedly connected to a bottom connecting block. The outer side of the bottom connecting block is fixedly connected to a spring strip. The end of the spring strip away from the bottom connecting block is fixedly connected to the first sliding plate.

9. A flashlight with adjustable focus according to claim 7, characterized in that: The protective mechanism includes a lamp, which has a convex lens inside for focusing light. Both sides of the convex lens are provided with locking rings, which are fixedly connected to the inside of the lamp for positioning and fixing the convex lens. An annular bladder is fixedly connected inside the locking ring to enhance the sealing of the convex lens installation. The outer end face of the lamp fits into the insert plate, and the outer end face of the lamp is fixedly connected to the fixing rod and the support seat respectively. The gas pipe passes through the insert plate and the lamp in sequence and is connected to the outer pipe to form a complete gas flow channel.

10. A flashlight with adjustable focus according to claim 9, characterized in that: An air groove is provided on the outside of the lamp, and an external pipe is fixedly connected to the outside of the lamp. The two ends of the air groove are respectively connected to the annular bladder and the external pipe to realize gas conduction between the annular bladder and the external pipe. A cylinder is fixedly installed on the outer end face of the outer tube. A piston rod is slidably fitted to the end of the cylinder away from the outer tube. By pushing the piston rod, the air pressure in the annular bladder can be adjusted to achieve the clamping protection of the convex lens.

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