Anti-theft security double-shoulder bag
By designing a discreet zipper structure and expansion pocket components on the anti-theft backpack, the problem of the anti-theft function relying on power and fixed volume is solved, achieving both security and flexible volume adjustment when power is insufficient.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAINAN LIUFENG LUGGAGE CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-19
AI Technical Summary
Existing anti-theft backpacks rely on electricity for their anti-theft function, which fails when the power is depleted, and their fixed volume cannot meet the capacity requirements of diverse usage scenarios.
The design incorporates a discreet zipper structure and an expansion pocket assembly. The zipper pull needs to be unlocked from the back, and the expansion pocket achieves volume expansion through a worm gear and rack structure.
It improves anti-theft performance, enhances concealment, and allows for flexible volume adjustment via an expansion pocket to meet the needs of different usage scenarios.
Smart Images
Figure CN224369291U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of backpack technology, specifically to an anti-theft security backpack. Background Technology
[0002] Backpacks are a common type of backpack. They distribute the weight of the bag across both shoulders with two shoulder straps, combining comfort and practicality. They are usually rectangular in shape and have multiple compartments inside for storing books, clothes, electronic devices and other items. They are often equipped with side pockets and front pockets for storing frequently used items such as water bottles and keys.
[0003] With the improvement of people's living standards and the increase in travel frequency, backpacks have become an indispensable personal item for daily commuting, travel and outdoor activities. When carrying backpacks, users often store valuables such as mobile phones, wallets, documents and laptops inside. The safe storage of these items is particularly important. In crowded public places, such as subway stations, train stations and shopping malls, backpacks are easy to be targeted by criminals because they are worn on the back and are not easy to keep an eye on at all times.
[0004] The prior art, disclosed in CN221749853U, provides an anti-theft security backpack, relating to the field of backpack technology. It includes a backpack body with a zipper on its outer side. A first chain head is connected to the outer side of the zipper, and a mounting plate is fixedly installed at one end of the first chain head. The mounting plate has two sliding grooves inside, each with a first slider slidably connected to it. A connecting plate is fixedly installed between the two first sliders. The beneficial effect is that by using a limiting groove to move the second chain head into the mounting shell, a motor drives a lead screw to rotate, causing a second slider to slide within a rotating groove. The sliding of the second slider moves the fixing plate, causing it to engage with the limiting groove, thus limiting the second chain head. The limiting and unfolding of the second chain head can be controlled by a fingerprint input key and numeric keys, increasing the protective structure and significantly enhancing security.
[0005] The aforementioned existing technology uses fingerprint input keys and numeric keys to control the motor in anti-theft backpacks to achieve the anti-theft function. However, this type of anti-theft design relies excessively on electrical equipment. Once the power is depleted, the backpack's anti-theft function and some other functions will be difficult to operate normally. In addition, existing backpacks generally lack volume expansion structures, and their fixed capacity makes them significantly limited when carrying different quantities of items or dealing with diverse usage scenarios. They cannot flexibly adapt to the changing capacity needs of users in different scenarios such as daily commuting and short trips.
[0006] It is evident that there is a need for an anti-theft security backpack to address the issues mentioned in the background technology, such as the over-reliance on electricity for anti-theft functions, the failure of functions after the power is depleted, and the fixed backpack volume, which makes it difficult to adapt to the capacity requirements of diverse usage scenarios. Utility Model Content
[0007] The purpose of this invention is to provide an anti-theft security backpack to solve the problems mentioned in the background art.
[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an anti-theft security backpack, including a bag body, an opening on the back of the bag body, and interlocking zipper heads at both ends of the opening, and an expansion pocket connected to the bottom of the bag body, wherein an expansion component for expanding the capacity of the expansion pocket is installed inside the expansion pocket.
[0009] The zipper head includes a first zipper head and a second zipper head. A first buckle is connected to one side of the first zipper head, and a second buckle is connected to one side of the second zipper head. The second buckle and the first buckle have the same internal structure and are engaged with each other. A first triangular block is connected to one end of the first buckle, and an inclined and rotatable first semicircular block is provided inside the first buckle. A first lever is connected to one side of the first semicircular block, which passes through the first buckle, and a first spring is connected to one end of the first lever.
[0010] The extension assembly includes an upper sleeve and a lower sleeve that are nested together. One end of the lower sleeve is connected to a rack. The upper sleeve has a half gear inside, and a worm gear is provided on one side of the half gear. A worm is engaged below the worm gear.
[0011] Preferably, the opening includes a first hidden portion, and a second hidden portion is provided on one side of the first hidden portion. A zipper is provided inside the first hidden portion and the second hidden portion, and the first zipper head and the second zipper head are located at both ends of the zipper.
[0012] Preferably, one end of the second buckle is connected to a second triangular block, and the interior of the second buckle is provided with an inclined and rotatable second semicircular block. One side of the second semicircular block is connected to a second lever that passes through the second buckle, and one end of the second lever is connected to a second spring.
[0013] Preferably, the second buckle has a triangular groove inside, and the triangular groove matches the first triangular block. The first buckle has a triangular groove inside, and the triangular groove matches the second triangular block. The second buckle has a first semicircular groove inside, and the first buckle has a second semicircular groove inside. The first semicircular block and the second semicircular block rotate inside the first semicircular groove and the second semicircular groove, and the inclined surfaces of the first semicircular block and the second semicircular block match.
[0014] Preferably, one end of the second spring is connected to the inside of the second buckle, and the second spring passes through the second buckle and extends to its outside; one end of the first spring is connected to the inside of the first buckle, and the first spring passes through the first buckle and extends to its outside.
[0015] Preferably, the interior of the expandable bag is connected to an expandable zipper, and the expandable zipper is located in the middle of the expandable bag, and the interior of the expandable bag is provided with folded fabric.
[0016] Preferably, the bottom of the lower sleeve is connected to a roller, and the rack meshes with the half gear. The half gear and the worm gear are coaxial, and the worm gear is located outside the upper sleeve. One end of the worm is provided with a handle, and a fixing frame is provided on the outside of the worm.
[0017] Compared with the prior art, the beneficial effects achieved by this utility model are:
[0018] First, this utility model features a zipper structure on the back of the backpack, with a specially designed bag body, opening, and zipper head. Because the back fits snugly against the back, it naturally offers a concealment advantage. Furthermore, the zipper is covered by two hidden panels on the outside, further enhancing the concealment effect. The first and second buckles at both ends of the zipper head engage with the zipper, requiring unlocking before the zipper can be opened. The unlocking position is also located in the back contact area, increasing the difficulty of unlocking. This design effectively improves the anti-theft performance in terms of both concealment and operational complexity.
[0019] Secondly, this utility model expands the backpack's volume through the addition of an expansion bag and expansion components. Rotating the worm gear drives the rack to extend from the upper sleeve, providing rigid support for the expanded bag and meeting the storage needs of fragile items. The increased height of the backpack, combined with the sliding function of the rollers, allows for manual pushing and flexible volume adjustment based on the load, completely breaking through the limitations of the fixed capacity of traditional backpacks. It flexibly addresses scenarios such as daily commuting and short trips, increasing the device's practicality. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 This utility model Figure 1 Enlarged view of the structure at point A;
[0022] Figure 3 This is a diagram showing the connection structure between the first and second buckles of this utility model.
[0023] Figure 4 This is a structural exploded view of the extended component of this utility model;
[0024] Figure 5This is a diagram showing the connection structure of the extension component of this utility model.
[0025] The components are as follows: 1. Bag body; 2. Opening; 201. First hidden part; 202. Second hidden part; 3. Zipper head; 301. First zipper head; 302. First buckle; 3021. First triangular block; 3022. First semicircular block; 3023. First lever; 3024. First spring; 303. Second zipper head; 304. Second buckle; 3041. Second triangular block; 3042. Second semicircular block; 3043. Second lever; 3044. Second spring; 4. Extension pocket; 401. Extension zipper; 5. Extension assembly; 501. Roller; 502. Lower sleeve; 5021. Rack; 503. Upper sleeve; 5031. Half gear; 5032. Worm gear; 5033. Worm. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Please see Figure 1-5 An anti-theft security backpack includes a bag body 1, an opening 2 on the back of the bag body 1, and interlocking zipper heads 3 at both ends of the opening 2. An expansion pocket 4 is connected to the bottom of the bag body 1, and an expansion component 5 for expanding the capacity of the expansion pocket 4 is installed inside the expansion pocket 4.
[0028] The zipper head 3 includes a first zipper head 301 and a second zipper head 303. A first buckle 302 is connected to one side of the first zipper head 301, and a second buckle 304 is connected to one side of the second zipper head 303. The second buckle 304 and the first buckle 302 have the same internal structure and engage with each other. A first triangular block 3021 is connected to one end of the first buckle 302, and an inclined and rotatable first semicircular block 3022 is provided inside the first buckle 302. A first lever 3023 that passes through the first buckle 302 is connected to one side of the first semicircular block 3022, and a first spring 3024 is connected to one end of the first lever 3023.
[0029] The extension component 5 includes an upper sleeve 503 and a lower sleeve 502 that are nested together. One end of the lower sleeve 502 is connected to a rack 5021. The upper sleeve 503 has a half gear 5031 inside, and a worm gear 5032 is provided on one side of the half gear 5031. A worm 5033 is meshed below the worm gear 5032.
[0030] With the above technical solution, the bag body 1 has no zippers on the outside except for the inner side of the opening 2 at the back. As a result, the bag body 1 can only be opened from the opening 2, which is in contact with the back of the person, thus increasing the anti-theft effect. A partition can be added inside the bag body 1, and a zipper can be installed between the partition and the inner wall of the bag body 1. However, to open the partition, the zipper of the opening 2 must be opened first. The bag body 1 can be made of a scratch-resistant and tear-resistant fabric material, thereby reducing the possibility of thieves cutting it with a knife.
[0031] Specifically, the opening 2 includes a first hidden part 201, and a second hidden part 202 is provided on one side of the first hidden part 201. A zipper is provided inside the first hidden part 201 and the second hidden part 202, and a first zipper head 301 and a second zipper head 303 are located at both ends of the zipper.
[0032] Through the above technical solution, the first hidden part 201 and the second hidden part 202 do not cover the zipper in a 50 / 50 manner. Instead, the area of the first hidden part 201 is larger than that of the second hidden part 202. It can be divided into 20 / 80 or 10 / 90. Both are made of fabric and can cover each other from top to bottom, thereby achieving the purpose of concealing the zipper. The bag body 1 also includes a shoulder strap, which is located on the back of the bag body 1.
[0033] Specifically, one end of the second buckle 304 is connected to the second triangular block 3041, and the interior of the second buckle 304 is provided with an inclined and rotatable second semicircular block 3042. One side of the second semicircular block 3042 is connected to a second lever 3043 that passes through the second buckle 304, and one end of the second lever 3043 is connected to a second spring 3044.
[0034] With the above technical solution, under the action of the spring, the first semicircular block 3022 and the second semicircular block 3042 are initially tilted. When the first latch 302 and the second latch 304 engage, the first semicircular block 3022 and the second semicircular block 3042 come into contact. As they are pushed forward, the tilted surfaces gradually become horizontal. When the first latch 302 and the second latch 304 are fully engaged, the spring returns to its original position, causing the second semicircular block 3042 to rotate into the semicircular groove in the first latch 302, and the corresponding first semicircular block 3022 to rotate into the semicircular groove in the second latch 304. At this time, since half of the semicircular block is located in the groove in the first latch 302 and half is located in the groove in the second latch 304, they are engaged, and the block cannot be unlocked without moving the corresponding lever.
[0035] Specifically, the second buckle 304 has a triangular groove inside, which matches the first triangular block 3021. The first buckle 302 has a triangular groove inside, which matches the second triangular block 3041. The second buckle 304 has a first semi-circular groove inside, and the first buckle 302 has a second semi-circular groove inside. The first semi-circular block 3022 and the second semi-circular block 3042 can rotate inside the first and second semi-circular grooves, and the inclined surfaces of the first semi-circular block 3022 and the second semi-circular block 3042 match.
[0036] Through the above technical solution, a groove is provided on the back of the bag body 1 behind the first zipper head 301 and the second zipper head 303, so that the first buckle 302 and the second buckle 304 in the locked state can be inserted into the groove, so that the person will not feel uncomfortable when the locking structure comes into contact with the back.
[0037] Specifically, one end of the second spring 3044 is connected to the inside of the second buckle 304, and the second spring 3044 passes through the second buckle 304 and extends to its outside. One end of the first spring 3024 is connected to the inside of the first buckle 302, and the first spring 3024 passes through the first buckle 302 and extends to its outside.
[0038] Through the above technical solution, a positioning shaft can be provided at one end of the second semicircular block 3042 and fixed inside the first buckle 302. Similarly, the positioning shaft provided at one end of the second spring 3044 is also fixed inside the second buckle 304.
[0039] Specifically, the interior of the expansion bag 4 is connected by an expansion zipper 401, and the expansion zipper 401 is located in the middle of the expansion bag 4. The interior of the expansion bag 4 is provided with folded fabric.
[0040] Through the above technical solution, the internal space of the expansion bag 4 is connected to the internal space of the bag body 1. However, to store items in the expansion bag 4, it is also necessary to enter through the opening 2. Pulling open the expansion zipper 401 only unfolds the folded fabric in the expansion bag 4, and it is not possible to directly store items into it through the expansion zipper 401.
[0041] Specifically, the bottom of the lower sleeve 502 is connected to a roller 501, and the rack 5021 meshes with the half gear 5031. The half gear 5031 and the worm gear 5032 are coaxial, and the worm gear 5032 is located on the outside of the upper sleeve 503. One end of the worm 5033 is provided with a handle, and the outside of the worm 5033 is provided with a fixing frame.
[0042] Through the above technical solution, a rigid block is set inside the expansion bag 4 to stably install the expansion component 5, which can be fixed to the inner wall of the expansion bag 4. The expansion component 5 can be made of metal to increase its service life, or it can be made of plastic to reduce the weight of the bag body 1 itself. The worm 5033 and the worm wheel 5032 can prevent reverse rotation, thereby avoiding the sleeve from retracting when the worm 5033 is not rotated.
[0043] In use, first unlock the first zipper head 301 and the second zipper head 303. Move the first lever 3023 and the second lever 3043. Under the action of the spring, the first semicircular block 3022 and the second semicircular block 3042 rotate, so that the contact surfaces of the first semicircular block 3022 and the second semicircular block 3042 are in a horizontal state. This unlocks the backpack, causing the first triangular block 3021 to disengage from the inside of the second buckle 304 and the second triangular block 3041 to disengage from the inside of the first buckle 302. This separates the first zipper head 301 and the second zipper head 303. Pull the first zipper head 301 and the second zipper head 303 to separate the zipper, thereby opening the backpack and taking out or putting in items from inside.
[0044] If the backpack needs to be expanded, the expansion zipper 401 can be opened to unfold the folded fabric inside the expansion pocket 4, increasing the internal capacity of the expansion zipper 401. If the bottom needs support, the worm gear 5033 can be rotated to rotate the worm wheel 5032. The worm wheel 5032 drives the half gear 5031 to rotate, which in turn causes the rack 5021 and the lower sleeve 502 to extend out from the inside of the upper sleeve 503, adding internal support to the expanded part. At this time, the overall height of the bag body 1 increases, making it easier to slide the backpack on the ground with the help of the rollers 501.
[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A pick-proof security backpack comprising a body (1), characterized in that: The back of the bag body (1) is provided with an opening (2), and the two ends of the opening (2) are provided with interlocking zipper heads (3). The bottom of the bag body (1) is connected to an expansion bag (4), and an expansion component (5) for expanding the capacity of the expansion bag (4) is installed inside the expansion bag (4). The zipper head (3) includes a first zipper head (301) and a second zipper head (303). A first buckle (302) is connected to one side of the first zipper head (301), and a second buckle (304) is connected to one side of the second zipper head (303). The second buckle (304) and the first buckle (302) have the same internal structure and are engaged with each other. A first triangular block (3021) is connected to one end of the first buckle (302), and an inclined and rotatable first semicircular block (3022) is provided inside the first buckle (302). A first lever (3023) that passes through the first buckle (302) is connected to one side of the first semicircular block (3022), and a first spring (3024) is connected to one end of the first lever (3023). The extension component (5) includes an upper sleeve (503) and a lower sleeve (502) that are nested together. One end of the lower sleeve (502) is connected to a rack (5021). The upper sleeve (503) is provided with a half gear (5031) inside. A worm gear (5032) is provided on one side of the half gear (5031). A worm (5033) is meshed below the worm gear (5032).
2. The anti-theft security backpack of claim 1, wherein: The opening (2) includes a first hidden part (201), and a second hidden part (202) is provided on one side of the first hidden part (201). A zipper is provided inside the first hidden part (201) and the second hidden part (202), and the first zipper head (301) and the second zipper head (303) are located at both ends of the zipper.
3. The anti-theft security backpack of claim 1, wherein: One end of the second buckle (304) is connected to a second triangular block (3041), and the interior of the second buckle (304) is provided with an inclined and rotatable second semicircular block (3042). One side of the second semicircular block (3042) is connected to a second lever (3043) that passes through the second buckle (304), and one end of the second lever (3043) is connected to a second spring (3044).
4. The anti-theft security backpack of claim 3, wherein: The second buckle (304) has a triangular groove inside, and the triangular groove matches the first triangular block (3021). The first buckle (302) has a triangular groove inside, and the triangular groove matches the second triangular block (3041). The second buckle (304) has a first semi-circular groove inside, and the first buckle (302) has a second semi-circular groove inside. The first semi-circular block (3022) and the second semi-circular block (3042) rotate inside the first semi-circular groove and the second semi-circular groove. The inclined surfaces of the first semi-circular block (3022) and the second semi-circular block (3042) match.
5. The anti-theft security backpack according to claim 3, characterized in that: One end of the second spring (3044) is connected to the inside of the second buckle (304), and the second spring (3044) passes through the second buckle (304) and extends to its outside. One end of the first spring (3024) is connected to the inside of the first buckle (302), and the first spring (3024) passes through the first buckle (302) and extends to its outside.
6. The anti-theft security backpack of claim 1, wherein: The interior of the expansion bag (4) is connected to an expansion zipper (401), and the expansion zipper (401) is located in the middle of the expansion bag (4). The interior of the expansion bag (4) is provided with folded fabric.
7. The anti-theft security backpack of claim 1, wherein: The bottom of the lower sleeve (502) is connected to a roller (501), and the rack (5021) meshes with the half gear (5031). The half gear (5031) and the worm gear (5032) are coaxial, and the worm gear (5032) is located outside the upper sleeve (503). One end of the worm (5033) is provided with a handle, and a fixing frame is provided on the outside of the worm (5033).