EVA bag strap length adjustment locking device

Abstract

The utility model discloses a kind of EVA bag strap length adjusting locking device, it is related to the technical field of strap adjusting, including bag body, the outer wall of the open end of bag body is provided with zipper, the outside of bag body is provided with strap assembly, the lower side of the right end of bag body is fixedly connected with back type buckle close to zipper, the outside of strap assembly is provided with length adjusting locking mechanism.The utility model passes through the strap in strap assembly is inserted from top to bottom along the left side's socket and back type buckle, then by outwardly bending locking assembly, the strap that is inserted is folded, so that end head is inserted from top to bottom right side's socket, the length of strap is adjusted to suitable length, then the force exerted to locking assembly is loosened, locking assembly is driven to return to original position using torsion spring, strap in right side socket is clamped and locked, by half-round boss of strap tail portion is inserted along corresponding positioning hole, so that the tail portion of strap is positioned.

Description

Technical Field

[0001] This utility model relates to the field of shoulder strap adjustment technology, specifically to an EVA bag shoulder strap length adjustment and locking device. Background Technology

[0002] EVA bags are made of ethylene-vinyl acetate copolymer (EVA), a non-toxic, odorless, and transparent thermoplastic that combines the flexibility of rubber with the processability of plastic. It is mainly used in applications requiring high protection, such as laptop bags and sports equipment bags. EVA bags are typically equipped with shoulder straps for easy carrying. However, existing technologies have the following problems:

[0003] Existing EVA bag straps typically use strap buckles to adjust their length during use. However, due to the lack of a locking mechanism, the straps are prone to loosening during use. Furthermore, after adjustment, the end of the strap hangs down to one side of the bag, affecting the aesthetics of the EVA bag. Utility Model Content

[0004] This invention provides an EVA bag strap length adjustment and locking device to solve the problems existing in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An EVA bag strap length adjustment and locking device includes a bag body, a zipper on the outer wall of the open end of the bag body, a strap assembly on the outside of the bag body, a snap fastener fixedly connected to the lower right side of the bag body near the zipper, and a length adjustment and locking mechanism on the outside of the strap assembly.

[0007] A further improvement of this utility model is that the length adjustment and locking mechanism includes an adjustment plate, a U-shaped plate, a connecting rod, a torsion spring, and a locking assembly. The left and right sides inside the adjustment plate are respectively provided with vertically penetrating insertion holes, and the upper side of the outer wall of the adjustment plate is provided with an internally and externally penetrating locking hole. The outer wall of the U-shaped plate is fixedly connected to the bottom of the outer wall of the adjustment plate. The front and rear ends of the connecting rod are respectively fixedly connected to the inside of the U-shaped plate, and the inside of the torsion spring is sleeved on the outer wall of the connecting rod.

[0008] A further improvement of the present invention is that the locking assembly includes a locking plate, several toothed blocks, an L-shaped plate, a U-shaped locking block, and a lever. One end of the toothed block is fixedly connected to the inner surface of the locking plate in a rectangular array. One end of the horizontal surface of the L-shaped plate is fixedly connected to the outer surface of the locking plate. The bottom of the L-shaped plate is fixedly connected to the middle side of the top of the U-shaped locking block. The two ends of the inner wall of the U-shaped locking block are respectively provided with through holes. The outer wall of the lever is fixedly connected to the outer surface of the L-shaped plate in the vertical direction.

[0009] A further improvement of this utility model is that: the inner wall of the locking plate extends through the locking plate to the inside of the right-side socket; the outer wall of the connecting rod extends through the insertion hole to the front and rear ends of the U-shaped block; the inner walls of the opposite sides of the U-shaped plate and the U-shaped block are respectively provided with slots; and the hook-shaped parts at both ends of the torsion spring are respectively engaged in the inside of the slots.

[0010] A further improvement of the present invention is that the shoulder strap assembly includes a shoulder strap, a connecting block, and a shoulder pad. The outer wall of the connecting block is fixedly connected to the left end of the shoulder strap, the upper surface of the shoulder pad is fixedly connected to the lower surface of the shoulder strap, and a plurality of positioning holes are equidistantly arranged on the right side of the middle part of the shoulder strap near the shoulder pad.

[0011] A further improvement of this utility model is that one end of the connecting block is fixedly connected to the left end of the bag body, and the outer wall of the shoulder strap is inserted into the inside of the snap fastener and the socket.

[0012] A further improvement of this utility model is that: a post is fixedly connected to the right side of the outer surface of the shoulder strap, and a semi-circular protrusion is fixedly connected to the top of the post.

[0013] A further improvement of this utility model is that the outer wall of the semi-circular protrusion is fastened to the inner surface of the shoulder strap through a positioning hole.

[0014] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0015] 1. This utility model provides an EVA bag strap length adjustment and locking device. It utilizes the cooperation between the bag body, strap assembly, snap fastener, and length adjustment and locking mechanism. The strap is inserted from top to bottom through the left-side slot and snap fastener. Then, by bending the locking component outwards, the inserted strap is folded in half, allowing the end to pass through the right-side slot from bottom to top, adjusting the strap length to a suitable level. Then, the force applied to the locking component is released, and a torsion spring returns the locking component to its original position, clamping and locking the strap in the right-side slot. This solves the problem that existing EVA bag straps, which typically use strap buckles to adjust length but lack a locking structure, are prone to loosening during use. This device achieves the beneficial effect of locking the strap assembly after length adjustment, preventing the strap from becoming loose.

[0016] 2. This utility model provides an EVA bag strap length adjustment and locking device. It uses the cooperation between the strap assembly and the snap fastener. After the length of the strap assembly is adjusted and locked, the semi-circular protrusion at the end of the strap is inserted along the corresponding positioning hole to position the end of the strap. This solves the problem that the end of the strap hangs down to one side of the bag after adjustment, affecting the aesthetics of the EVA bag. It achieves the beneficial effect of positioning the extra strap part and improving the aesthetics of the EVA bag. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the strap length adjustment and locking device of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the length adjustment and locking mechanism of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the locking component of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the shoulder strap assembly of this utility model;

[0021] Figure 5 This is a partially enlarged schematic diagram of the A-dimensional structure of this utility model.

[0022] In the diagram: 1. Bag body; 2. Zipper; 3. Shoulder strap assembly; 31. Shoulder strap; 310. Positioning hole; 32. Connecting block; 33. Shoulder pad; 34. Insert post; 35. Semi-circular protrusion; 4. Buckle; 5. Length adjustment and locking mechanism; 51. Adjustment plate; 510. Insert; 511. Locking port; 52. U-shaped plate; 53. Connecting rod; 54. Torsion spring; 55. Locking assembly; 551. Locking plate; 552. Tooth block; 553. L-shaped plate; 554. U-shaped locking block; 5540. Insertion hole; 555. Pulling block. Detailed Implementation

[0023] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments:

[0024] like Figure 1 As shown, this utility model provides an EVA bag strap length adjustment and locking device, including a bag body 1, a zipper 2 on the outer wall of the opening end of the bag body 1, a strap assembly 3 on the outside of the bag body 1, a snap fastener 4 fixedly connected to the lower side of the right end of the bag body 1 near the zipper 2, and a length adjustment and locking mechanism 5 on the outside of the strap assembly 3.

[0025] The system includes a shoulder strap assembly 3, a snap fastener 4, and a length adjustment and locking mechanism 5. The shoulder strap assembly 3 is folded in half and mounted on the length adjustment and locking mechanism 5 via the snap fastener 4 to adjust its length. Once the shoulder strap assembly 3 is adjusted to the appropriate length, the length adjustment and locking mechanism 5 is operated to lock it, preventing it from becoming loose.

[0026] like Figure 2 As shown, this utility model provides a technical solution for an EVA bag strap length adjustment and locking device: the length adjustment and locking mechanism 5 includes an adjustment plate 51, a U-shaped plate 52, a connecting rod 53, a torsion spring 54, and a locking assembly 55. The left and right sides of the interior of the adjustment plate 51 are respectively provided with through-holes 510. The two through-holes 510 allow the strap assembly 3 to be folded in half and inserted through the two through-holes 510 for easy length adjustment. The upper side of the outer wall of the adjustment plate 51 is provided with a locking port 511 that is open to both inside and outside. The outer wall of the U-shaped plate 52 is fixedly connected to the bottom of the outer wall of the adjustment plate 51. The front and rear ends of the connecting rod 53 are respectively fixedly connected to the interior of the U-shaped plate 52. The interior of the torsion spring 54 is sleeved on the outer wall of the connecting rod 53. The working principle of the torsion spring 54 is to store and release angular energy through elastic deformation. When subjected to external torsion, it generates torque or rotational force and returns to its initial position after the external force disappears.

[0027] like Figure 3 As shown, this utility model provides a technical solution for an EVA bag shoulder strap length adjustment and locking device: the locking component 55 includes a locking plate 551, several toothed blocks 552, an L-shaped plate 553, a U-shaped locking block 554, and a lever 555. One end of the toothed blocks 552 is fixedly connected to the inner surface of the locking plate 551 in a rectangular array. Multiple sets of toothed blocks 552 are arranged on the surface of the toothed blocks 552. When the locking plate 551 presses against the surface of the shoulder strap component 3, the toothed blocks 552 increase the frictional force between the locking plate 551 and the shoulder strap component 3. One end of the transverse surface of the L-shaped plate 553 is fixedly connected to the outer surface of the locking plate 551, and the bottom of the L-shaped plate 553 is fixedly connected to... On the top middle side of the U-shaped block 554, the two ends of the inner wall of the U-shaped block 554 are respectively provided with through holes 5540. The outer wall of the lever 555 is fixedly connected to the outer surface of the L-shaped plate 553 in the vertical direction. The inner wall of the locking plate 551 passes through the locking plate 551 to the inside of the right side socket 510. The outer wall of the connecting rod 53 passes through the front and rear ends of the U-shaped block 554 through the through holes 5540. The inner walls of the U-shaped plate 52 and the U-shaped block 554 are respectively provided with slots. The hook-shaped parts at both ends of the torsion spring 54 are respectively engaged in the inside of the slots. The hook-shaped parts of the torsion spring 54 are engaged in the slots, which limit the rotation of the locking component 55.

[0028] like Figure 4As shown, this utility model provides a technical solution for an EVA bag strap length adjustment and locking device: the strap assembly 3 includes a strap 31, a connecting block 32, and a shoulder pad 33. The outer wall of the connecting block 32 is fixedly connected to the left end of the strap 31, and the upper surface of the shoulder pad 33 is fixedly connected to the lower surface of the strap 31. The shoulder pad 33 can further relieve the pressure between the strap 31 and the user's shoulder. Several positioning holes 310 are equidistantly arranged on the right side of the middle of the strap 31 near the shoulder pad 33. One end of the connecting block 32 is fixedly connected to the left end of the bag body 1. The outer wall of the strap 31 is inserted into the inside of the snap fastener 4 and the slot 510. The outer wall of the strap 31 is inserted from top to bottom through the left slot 510 and the snap fastener 4, then the strap 31 is folded in half and then inserted from bottom to top through the right slot 510, which facilitates the adjustment of the length of the strap 31.

[0029] like Figure 5 As shown, this utility model provides a technical solution for an EVA bag strap length adjustment and locking device: a post 34 is fixedly connected to the right side of the outer surface of the strap 31, and a semi-circular protrusion 35 is fixedly connected to the top of the post 34. The outer wall of the semi-circular protrusion 35 is snapped onto the inner surface of the strap 31 through a positioning hole 310. The tail of the strap 31 is pressed and squeezed out by the semi-circular protrusion 35 and the corresponding positioning hole 310, preventing the tail of the strap 31 from hanging down to the outside of the bag body 1, thus improving the aesthetics of the EVA bag.

[0030] The working principle of this EVA bag strap length adjustment and locking device will be explained in detail below.

[0031] like Figure 1-5 As shown, when adjusting the length of the EVA bag strap using this locking device, firstly, the strap 31 is inserted from top to bottom through the left side of the slot 510 and the snap fastener 4. Then, the locking plate 551 is pried outward by the lever 555, disengaging the locking plate 551 from the inside of the slot 510. The U-shaped latch 554 rotates along the outer wall of the connecting rod 53 through the insertion hole 5540. The externally applied rotational force causes the torsion spring 54 to deform. Then, the inserted strap 31 is folded in half so that the end is inserted from bottom to top through the right side. The insertion port 510 is used to adjust the length of the shoulder strap 31 to a suitable length. The force applied to the locking component 55 is released, and after the external force disappears, the locking plate 551 is driven to return to its initial position. Multiple toothed blocks 552 clamp and lock the surface of the shoulder strap 31 to prevent the shoulder strap from becoming loose during the use of the EVA bag. Finally, the tail of the shoulder strap 31 is pressed and squeezed out through the semi-circular protrusion 35 and the corresponding positioning hole 310 to prevent the tail of the shoulder strap 31 from hanging down on the outside of the bag body 1, thereby improving the aesthetics of the EVA bag.

[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An EVA bag strap length adjustment and locking device, comprising a bag body (1), characterized in that: The outer wall of the opening end of the bag body (1) is provided with a zipper (2), the outer side of the bag body (1) is provided with a shoulder strap assembly (3), the right end of the bag body (1) is fixedly connected to the lower side of the zipper (2) with a snap fastener (4), and the outer side of the shoulder strap assembly (3) is provided with a length adjustment and locking mechanism (5). The length adjustment and locking mechanism (5) includes an adjustment plate (51), a U-shaped plate (52), a connecting rod (53), a torsion spring (54), and a locking assembly (55). The left and right sides of the interior of the adjustment plate (51) are respectively provided with through-holes (510). The upper side of the outer wall of the adjustment plate (51) is provided with a through-hole (511). The outer wall of the U-shaped plate (52) is fixedly connected to the bottom of the outer wall of the adjustment plate (51). The front and rear ends of the connecting rod (53) are respectively fixedly connected to the interior of the U-shaped plate (52). The interior of the torsion spring (54) is sleeved on the outer wall of the connecting rod (53).

2. The EVA bag strap length adjustment and locking device according to claim 1, characterized in that: The locking assembly (55) includes a locking plate (551), several toothed blocks (552), an L-shaped plate (553), a U-shaped locking block (554), and a lever (555). One end of the toothed block (552) is fixedly connected to the inner surface of the locking plate (551) in a rectangular array. One end of the horizontal surface of the L-shaped plate (553) is fixedly connected to the outer surface of the locking plate (551). The bottom of the L-shaped plate (553) is fixedly connected to the middle side of the top of the U-shaped locking block (554). The two ends of the inner wall of the U-shaped locking block (554) are respectively provided with through holes (5540). The outer wall of the lever (555) is fixedly connected to the outer surface of the L-shaped plate (553) in the vertical direction.

3. The EVA bag strap length adjustment and locking device according to claim 2, characterized in that: The inner wall of the locking plate (551) extends through the locking plate (551) to the inside of the right-side socket (510). The outer wall of the connecting rod (53) extends through the front and rear ends of the U-shaped block (554) through the socket (5540). The inner walls of the opposite sides of the U-shaped plate (52) and the U-shaped block (554) are respectively provided with slots. The hook-shaped parts at both ends of the torsion spring (54) are respectively engaged in the inside of the slots.

4. The EVA bag strap length adjustment and locking device according to claim 1, characterized in that: The shoulder strap assembly (3) includes a shoulder strap (31), a connecting block (32), and a shoulder pad (33). The outer wall of the connecting block (32) is fixedly connected to the left end of the shoulder strap (31), and the upper surface of the shoulder pad (33) is fixedly connected to the lower surface of the shoulder strap (31). Several positioning holes (310) are equidistantly arranged on the right side of the middle part of the shoulder strap (31) near the shoulder pad (33).

5. The EVA bag strap length adjustment and locking device according to claim 4, characterized in that: One end of the connecting block (32) is fixedly connected to the left end of the bag body (1), and the outer wall of the shoulder strap (31) is inserted into the inside of the snap fastener (4) and the socket (510).

6. The EVA bag strap length adjustment and locking device according to claim 4, characterized in that: A post (34) is fixedly connected to the right side of the outer surface of the shoulder strap (31), and a semi-circular protrusion (35) is fixedly connected to the top of the post (34).

7. The EVA bag strap length adjustment and locking device according to claim 6, characterized in that: The outer wall of the semi-circular protrusion (35) is fastened to the inner surface of the shoulder strap (31) through the positioning hole (310).

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