CN219515579U - Retraction device with impact force release function and backpack with retraction device - Google Patents

Abstract

The utility model relates to the technical field of retraction devices, and discloses a retraction device with impact force release and a backpack with the retraction device, wherein the retraction device comprises an upper base, and the upper base is provided with at least two wire inlets; for receiving the lead wire extending from the retraction adjusting portion; at least two wire coiling ports are distributed on the upper base, each wire coiling port is provided with a wire coiling shaft for dragging and winding the lead wire, and the wire coiling ports are separated from the winding shaft of the winding and unwinding adjusting part to bear the traction force of the lead wire; the wire winding opening is provided with a first thickness of flexible material with impact force absorption and release on the outer circumference of the winding shaft, and/or the winding shaft of the retraction adjusting part is provided with a first thickness of flexible material with impact force absorption and release on the outer circumference of the winding shaft. According to the winding and unwinding device and the backpack with the winding and unwinding device, the first surface coil opening can bear load together with the winding shaft of the winding and unwinding adjusting part, and the impact force buffer material is further arranged on the winding shaft, so that the service life of the winding shaft is prolonged.

Description

Retraction device with impact force release function and backpack with retraction device

Technical Field

The utility model relates to the field of adjustable retraction devices, in particular to a retraction device with impact force release and a backpack with the retraction device.

Background

The folding and unfolding device can be used as a closing device structure and can be used for various articles such as braces, medical devices, shoes, clothing and the like. The device mainly adjusts the external ropes, laces and the like to be wound and unwound on a rope winding shaft inside the device through an internal knob device, and further realizes corresponding winding and unwinding adjustment, thereby reflecting the effect of tightening and loosening shoelaces on a user, and the main structural elements are a reel for winding and a clamping device linked with the reel, and the rotating operation is converted into the winding and unwinding effect through the linkage of a rotating component.

The design of the winding and unwinding device is mainly applied to shoes, braces and clothes, the structure of the rope on the rope winding shaft has no excessively high requirement on bearing in the winding and unwinding process, only the tightening force and the clamping force of the corresponding lacing are overcome, the tightening force is the tension force of the rope which plays a role in tightening, and the clamping force further ensures the tension force of the rope and looseness caused by free movement; it is worth noting that the application scene such as footwear, braces and clothes will not produce the load requirement to the retraction device, and when the device is applied to the knapsack, the device may need to bear the load together with the knapsack, the retraction device structure is not only required to provide the tensile force to the tie, etc., but also can receive the traction force of the weight itself, this results in the retraction device to overcome the traction force of the weight in the adjustment process, and after the retraction device structure is adjusted, the traction force of the weight can be always received, this results in the tie winding part in the retraction device structure to continuously receive the traction force, damage or wear problem easily occurs, the whole retraction device structure cannot shrink, but in practice in many application scenes, for example, in some scenes, the student schoolbag is walking even jumping, the retraction device can produce a great impact force under the circumstance of the load, cause damage to the winding shaft and force decomposition mechanism, influence the use, or the retraction device is applied to the footwear, especially the heel is arranged at the retraction position of the retraction device due to the violent movement.

Disclosure of Invention

Aiming at one or more of the defects or improvement demands of the prior art, the utility model provides a retraction device with impact force release and a backpack with the retraction device, which are used for solving the problems of damage and short service life caused by the fact that the existing retraction device needs to participate in bearing the impact force of gravity in the use process.

In order to achieve the above object, the present utility model provides a retraction device, comprising,

a retraction adjusting part;

one end of the connecting piece is connected with the retraction adjusting part, and the other end of the connecting piece is used for being connected with an external piece to be retracted; and

the winding shaft is used for winding the connecting piece, and the connecting piece can wind around the winding shaft or reversely wind under the adjustment drive of the retraction adjusting part, so that an external piece connected with the connecting piece is driven to move, and retraction adjustment is realized;

it is characterized in that the retraction device further comprises,

the upper base is provided with at least two wire inlets and is used for receiving the leads extending from the retraction adjusting part;

at least two wire coiling ports are distributed on the upper base, each wire coiling port is provided with a wire coiling shaft for dragging and winding the lead wire, and the wire coiling ports are separated from the winding shaft of the winding and unwinding adjusting part to bear the traction force of the lead wire;

the wire winding shaft of the wire winding opening is made of a flexible material with a thickness capable of absorbing and releasing impact force, and/or the outer circumference of the wire winding shaft of the wire winding opening is provided with a flexible material with a first thickness capable of absorbing and releasing impact force;

and/or;

the winding shaft of the winding and unwinding adjusting part is made of a flexible material with a thickness capable of absorbing and releasing impact force, and/or the winding shaft of the winding and unwinding adjusting part is circumferentially provided with a flexible material with a second thickness capable of absorbing and releasing impact force.

Further, an installation part mechanism is arranged below the upper base, and a plurality of winding supporting structures are arranged on the installation part mechanism and used for bearing the traction force on the lead wires extending from the winding and unwinding device.

Further, the flexible material having impact force absorbing release is ACF.

Further, the first thickness is 0.5 mm-2 mm.

Further, the second thickness is 0.6 mm-3 mm.

Further, the winding support structure is made of flexible materials with impact force absorption and release functions.

Further, the mounting part mechanism has a third thickness in the axial direction of the winding shaft, and the third thickness is 1 mm-6 mm.

Further, the mounting part mechanism is in a non-connection relationship with the outer part at a position located at a certain distance from the retraction device, and the other parts are in a connection relationship.

Further, the winding and unwinding device is used for being installed with a knapsack, and the winding support structure is distributed and installed on the knapsack.

Further, the mounting mechanism is mounted to a back panel of the backpack, and/or to a bottom surface of the backpack, and/or to a shoulder strap of the backpack.

Further, the mounting portion mechanism is mounted to an upper shoulder strap of the backpack.

Further, the retraction device comprises a lower base, and is used for being embedded and clamped with the upper base.

Further, the lead is a non-elastic cord, an elastic cord, or a combination of a non-elastic cord and an elastic cord.

Further, the lead wire and the winding part of the winding and unwinding adjusting part are inelastic ropes, and the connecting part of the lead wire and the external part is an elastic rope.

In general, the above technical solutions conceived by the present utility model have the following beneficial effects compared with the prior art:

according to the retraction device realized by the utility model, firstly, the problem of modification setting of the retraction device combined with bearing stress application is solved; the utility model provides a method for realizing stress decomposition of a winding shaft of an adjusting part based on a mode of arranging two coil wire opening windings on a base of the winding and unwinding device, and further, in the case that impact force is possibly received by the winding shaft of the adjusting part and the winding shaft of the coil wire opening, the impact force absorbing material is arranged on the winding shaft of the adjusting part and the winding shaft of the coil wire opening, so that the sudden impact force is absorbed under the condition that the winding and unwinding device bears the impact force especially from a sudden, and the winding shaft of the adjusting part and the winding shaft of the coil wire opening are protected.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a retractable device according to an embodiment of the present utility model;

FIG. 2 is a left side view of the retracting device in an embodiment of the present utility model;

FIG. 3 is a schematic side view of a retractable device according to an embodiment of the present utility model;

fig. 4 is a schematic view of a wire opening 21 and a wire coiling opening 22 of the winding and unwinding device in the embodiment of the utility model;

fig. 5 is a schematic view showing the bottom structure of the upper base 2 of the retraction device according to the embodiment of the present utility model;

fig. 6 is a schematic sectional view of a part of the structures of the upper base 2 and the lower base 4 of the retraction device according to the embodiment of the present utility model;

FIG. 7 is a schematic view of the internal structure of the upper base of the retractable device according to the embodiment of the utility model;

fig. 8 is a schematic structural view of a mounting part mechanism of the retraction device according to an embodiment of the present utility model.

Like reference numerals denote like technical features throughout the drawings, in particular:

1. a knob member; 2. an upper base; 3. a lead wire; 4. a lower base; 5. winding a supporting structure; 6. a guard; 7. a mounting portion mechanism;

21. a lead wire port; 22. a wire coiling port; 23. a first accommodating part of the upper base; 24. a second accommodating part of the upper base; 25. the first clamping block of the upper base; 26. a second clamping block of the upper base;

211. a first outlet; 212. a second outlet; 213. a first wire inlet; 214. a second wire inlet; 215. a third outlet; 216. a fourth outlet; 221. a first coil opening; 222. a second coil opening;

2211. a wire coiling shaft is arranged at the wire coiling port; 2212. the wire coiling port is clamped with the through hole; 2213. a winding limiting block;

41. a first convex column of the lower base; 42. a second convex column of the lower base; 43. the lower base is inserted into the hole.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The core concept of the utility model is mainly applied to the situation that a receiving and releasing device is loaded, and referring to the prior art, the disclosure No. CN113693365A provides a receiving and releasing device and a knapsack with the receiving and releasing device, the disclosure No. CN215837597U provides a force decomposing mechanism, the receiving and releasing device with the force decomposing mechanism and the knapsack, the setting form of force decomposition is utilized to further decompose and bear the weight force applied on a winding shaft, and the core concept of the utility model further provides a solution to the problem that the receiving and releasing device generates large impulse to damage due to the movement of the load in a certain direction.

Referring specifically to the retraction device with elastic impact release in one embodiment shown in fig. 1-2 of the present utility model, the retraction device specifically includes a knob member 1, an upper base 2, and a lower base 4, wherein a surface of an application object to be installed of the retraction device is sandwiched between the upper base 2 and the lower base 4, and in other embodiments, the application may be implemented by stitching and pasting the upper base 2 and the surface of the application object to be installed.

In the utility model, an accommodating space between a knob piece 1 and an upper base 2 is provided with an adjusting part for realizing winding type storage and reverse winding type release of a lead 3, and the adjusting part specifically comprises a tensioning component, a spool part, a tightening part and a connecting part. The spool part is rotatably positioned in the receiving area, the takeup part is for being positioned axially above the spool part and for rotation of the spool part in the receiving area, thereby effecting rotational winding of the take-up member on the spool part to effect winding-up and reverse winding-out of the wire 3. The above structure is not described in detail herein, and a specific structure may be referred to a reel-based closing system of publication No. CN110049694a, in which a first position and a second position, in which an elastic member is elastically deformed to change an intermediate structure, enable winding-type storage corresponding to the first position, and a second position, in which reverse winding-type release is implemented, and in an embodiment in which an adjusting portion is provided in another accommodating space, a string adjusting device and assembly are disclosed, in which a circular rack in which a spring piece of a clip is engaged with the spring piece, enables adjustment in a first direction and adjustment in a second direction, and adjustment corresponding to the first direction enables winding-type storage, and in which reverse winding-type release is implemented, in this way, storage and release can be achieved without using a change in both positions. The core technical scheme of the utility model is that the problem of load bearing in a stable state is realized after the lead 3 is stored and released from an adjusting state, and the problem of damage to a force decomposing mechanism caused by large impact force is further solved under the condition of load bearing movement.

In the winding and unwinding device according to the preferred embodiment of the utility model, as shown in fig. 1-2, the winding device mainly comprises a knob member 1 and an upper base 2, wherein the winding wire in the adjusting portion extends out of the opening of the upper base 2, as shown in fig. 3-4, wherein the opening of the winding wire extending is a first wire outlet 211 and a second wire outlet 212, wherein the upper base 2 is provided with a first wire inlet 213 and a second wire inlet 214 respectively corresponding to and receiving the winding wire of the first wire outlet 211 and the second wire outlet 212, so that the winding wire extends from the adjusting portion to the base, the wire inlet 22 arranged on the upper base 2 and the lower base 4 embedded with the upper base 2 is used as a force decomposing mechanism for winding wire, and loads together with the winding shaft in the adjusting portion, thereby avoiding the problem that the winding shaft is easy to be damaged under the condition of bearing load alone.

As one embodiment of the present utility model, the wire winding port 22 includes a first wire winding port 221 and a second wire winding port 222 disposed on two sides of the base and disposed at a certain distance. On the upper base 2, the lead 3 enters the first coil opening 221 and the second coil opening 222 from the first inlet 213 and the second inlet 214, and exits from the third outlet 215 and the fourth outlet 216 provided on the upper base 2, so as to connect the application objects to be adjusted.

The conventional retraction device structure is mainly applied to a lacing system of a shoe by arranging the retraction device at a shoelace tightening point, i.e., a tongue (centered, left or right) or a heel portion. The shoelace is contracted or loosened through the tightening and loosening operations of the contraction and loosening device, so that the shoelace length in the shoelace eyes is adjusted, and the tightening and loosening of the whole shoe are achieved. During the operation of the retraction device, the retraction device mainly plays roles of tightening and loosening the shoelaces, and the retraction of the shoelaces is limited to the vamp and is not interfered or restrained by other forces.

The folding and unfolding device can be applied to shoes to prolong the service life of the folding and unfolding device, the flexible structures of the upper base 2 and the lower base 4 are adapted to be arranged to be applied to application objects with different structures, the folding and unfolding device is mainly arranged at the tail ends of shoulder straps of the knapsack, the folding and unfolding device is used for shrinking the shoulder straps to adjust the shoulder strap length of the knapsack, and then the gravity center of the knapsack is adjusted to improve the comfort of a user carrying the knapsack, or the folding and unfolding device is arranged on the back or the side face of the knapsack. However, in the existing knapsack, the folding and unfolding device is fixed on the knapsack in the process of adjusting by the folding and unfolding device, the folding and unfolding device can drive the whole knapsack to be adjusted when the folding and unfolding function is executed, so that the actual traction load of the folding and unfolding device is the weight of the whole knapsack, particularly, under the condition that the weight of the knapsack of a student group is greatly increased, the tensile load of a winding shaft of the folding and unfolding device, which is used for executing winding operation, is quite large, the folding and unfolding device in the existing knapsack is extremely fragile in the stretching process, and because of the existence of the load, the telescopic adjustment of the folding and unfolding device is not easy to control, the adjusting difficulty of the shoulder strap of the knapsack is greatly increased.

Further, as shown in fig. 4, the internal structure of the upper base 2 in the retraction device according to the present utility model includes a first coil opening 221 and a second coil opening 222, wherein, taking the first coil opening 221 as an example, the second coil opening 222 and the first coil opening 221 are preferably symmetrically arranged by taking the knob member 1 as a middle axis, and one plane is an opening structure, and on the other plane, as shown in fig. 5, the retraction device includes a coil opening spool 2211, a coil opening clamping through hole 2212 and a winding limiting block 2213; the wire winding spool 2211 has a cylindrical structure extending along an axial depth thereof, so that the wire 3 extends from the first wire inlet 213 through the wire winding spool 2211 and then through the third wire outlet 215, and the wire winding stopper 2213 has a limiting structure disposed on the wire winding spool 2211 and extending along a radial direction of the wire winding spool 2211, so as to keep the wire 3 from falling off from the wire winding spool 2211.

Further, as the lower base 4 fitted and matched with the upper base 2 in the embodiment of the present utility model, as shown in fig. 6, specifically including a lower base first boss 41 and a lower base second boss 42, wherein the lower base first boss 41 and the lower base second boss 42 are disposed in one-to-one correspondence with the first wire opening 221 and the second wire opening 222, and the boss structure is embedded in the wire opening in the opposite installation of the upper base 2 and the lower base 4, in this way, the boss structure and the wire opening spool 2211 are also fitted at the same time, together forming a force-decomposing structure of the lead 3; further, the lower base 4 further includes a lower base spool insertion hole 43 matched with the spool hole shaft in the adjusting portion, so that the spool in the adjusting portion and the lower base spool insertion hole 43 are embedded together to form an integral structure to realize the fixed arrangement of the spool on the application object.

In summary, as the first aspect of the embodiment of the present utility model, the proposed retraction device, the knob member 1 and the upper base 2 form the accommodation space of the adjustment portion, the upper base 2 and the lower base 4 are engaged with each other, and the engaged portion may be the force-releasing mechanism at the same time or may not be the force-releasing mechanism, and the engaged mounting portion and the force-releasing mechanism may be separately provided. The force splitting mechanism receives the lead 3 from the spool in the adjusting portion so that the lead 3 can bear a load by the force splitting mechanism.

As a winding shaft winding and unwinding operation principle of the adjusting part in the present utility model, the present utility model is not focused on the protection scope, and a scheme adopted in a reel-based closing system as disclosed in publication No. CN110049694a may be adopted, where the knob member 1 and the upper base 2 may be wound and unwound without a distance, and the winding and unwinding operation may be performed after a certain distance is provided between the knob member 1 and the upper base 2 by axial stretching, or as disclosed in publication No. CN208192360U, a rope belt adjusting device and assembly may be provided, and winding and unwinding operations may be performed during forward rotation and reverse rotation of the knob member 1. In a preferred embodiment of the present utility model, the upper base 2 has an upper protrusion structure having the same diameter as the contact portion of the knob member 1, so that more accommodation space between the knob member 1 and the upper base 2 forms the upper base first accommodation portion 23 to form a structural arrangement of the accommodation adjusting portion of the accommodation space.

The preferred embodiment of the present utility model is that the knob member 1 and the upper base 2 achieve winding and accommodating adjustment of the lead 3 without a gap, and achieve winding and unwinding adjustment of the lead 3 with a certain gap between the upper knob member 1 and the upper base 2, and the certain gap is preferably 1mm, wherein the main body portions of the upper base 2 and the lower base 4 are oval shapes which are embedded with each other, wherein the first coil opening 221 and the second coil opening 222 are symmetrically arranged at two sides of the oval structure of the knob member 1 in the major axis direction, wherein the first coil opening 221 and the second coil opening 222 are symmetrical, and the distance between the position on the major axis and the center axis is greater than the distance between the third coil opening 215 and the fourth coil opening 216 and the center axis.

Wherein the spool 2211 highly preferably accommodates only a thickness including one turn of the lead 3 so that the adjusting operation of the overall apparatus is smoother.

The second aspect of the utility model further solves the problem that the damage of the retraction device can occur when the retraction device generates larger stress than the received movement impulse.

The first lower base boss 41 and the second lower base boss 42 are composed of a central column with a smaller diameter and a plurality of circumferentially spaced elastic pieces, and in this way, the elastic pieces are embedded into the coil wire opening clamping through holes 2222 and clamped by elastic force. Alternatively, the clamping force of the part is mainly used for solving the clamping problem of the winding rope between the upper base 2 and the lower base 4 and the application object and the force decomposition mechanism by other modes of adhesion and the like, in a specific embodiment, as shown in fig. 7, the central column is further clamped at the upper end of the upper base 2, so that the upper base first clamping block 25 and the upper base second clamping block 26 correspondingly arranged on the first coil opening 221 and the second coil opening 222 further lock the convex column of the lower base 4, thereby improving the fixing strength of the corresponding object.

The retraction device can be further combined with a separate force decomposition mechanism arranged outside the retraction device to be combined with the retraction device in the utility model. As a preferred example of the present utility model, as shown in fig. 8, in order to enhance stability of the winding support 5 of the separate force splitting device in use, as one of the embodiments used in combination, a mounting portion mechanism 7 is provided for the winding support 5, the winding support 5 is provided on the mounting portion mechanism 7, and after the winding support 5 receives the lead wire 3 extending from the winding and unwinding device, a traction force is distributed to the mounting portion mechanism 7 to maintain stable operation of the winding support 5. Preferably, the retraction device is arranged on the installation part mechanism 7, the installation part mechanism 7 is fixedly connected or detachably connected, the installation part mechanism 7 can help the retraction device to better buffer the impact force from the load, at the moment, the installation part mechanism 7 is clamped between the upper base 2 and the lower base 4, and the installation part mechanism 7 is arranged on the bag body structure of the schoolbag in a sewing or pasting mode or is arranged on the shoes.

In a specific embodiment, the winding support structure 5 and/or the mounting part mechanism 7 or the connection between them is made of a novel ACF bionic material with a certain thickness, which can instantly absorb more than 90% of impact force, and instantly convert the impact energy into insignificant heat energy, so that under the condition that the receiving and releasing device generates first-stage load impact, the impact force is absorbed and resolved at the instant that the impact force is transmitted to the receiving and releasing device. The thickness of the wrapped material is 0.5 mm-2 mm, and in order to keep the smoothness of winding, the material is provided with a certain density, so that certain strength can be born under the condition of winding, deformation is avoided, and a shell layer with certain hardness is wrapped on the surface of the material, so that the smoothness of winding is kept. In other embodiments, if the material can be ensured to have a certain density and achieve a corresponding mechanical hardness, the winding shaft of the adjusting part and the winding shaft of the wire winding opening can be directly made of the material and correspond to a corresponding thickness, and further, on the basis of the embodiment, the material with a corresponding thickness can be further wrapped on the periphery.

In a specific embodiment, the winding shaft 2211 of the winding and unwinding device is further provided such that the outer shaft surface includes an outer circumferential surface of the above material having a thickness, and the thickness is preferably 0.6mm to 3mm, so as to further reduce the impact force of the load from the first stage or the second stage in order to prevent the buffer.

In a specific embodiment, the main winding shaft in the adjusting part of the winding and unwinding device also wraps the outer peripheral surface of the material with a certain thickness, so as to further reduce the impact force of the load on the premise that the winding support structure 5 realizes impact force protection.

Further, the winding support 5 is a flexible material having impact absorbing and releasing properties.

Further, the mounting portion mechanism 7 has a third thickness in the axial direction of the shaft of the adjusting portion, and the third thickness is 1mm to 6mm.

Further, when one or more winding support structures 5 are arranged on the mounting part mechanism 7, the lead 3 stretches out from the winding and unwinding device and then is pulled to the first winding support structure 5, and then is pulled out from the first winding support structure 5, and the angle formed at the first winding support structure 5 is 100-170 degrees or 10-80 degrees; preferably 120 to 150 degrees, i.e. in this case the first winding support 5 is arranged obliquely below the retraction device. Preferably, in the case of multiple winding branch structures 5, the included angle formed from the first winding branch structure 5 to the second winding branch structure 5 is 5 ° to 85 ° or 95 ° to 175 °, and the traction force is shared to the winding branch structures 5. Of course, the abrasion of the winding support 5 can be reduced by increasing the number of winding supports 5 or the structural size of the winding support 5 itself. Preferably, the exposed portion of the lead 3 on the mount mechanism 7 is further protected and shielded by the shield 6.

Describing the specific arrangement of the winding support 5 with respect to the angle formed by the winding support 5, as shown in fig. 6, the direction of the traction force formed by the connection of the lead 3 between the winding support 5 and the adjusting portion spool is the second direction, the direction of the pressure generated by the lead 3 of the adjusting portion spool due to the bearing force of the external component connected with the lead 3 is the first direction, the included angle between the second direction and the first direction is 1 ° to 179 °, preferably, the included angle between the second direction and the first direction is 120 ° to 150 °, and when the included angle between the two directions is within this range, the adjusting portion spool and the winding support 5 can be accommodated in a smaller space range, and a more force decomposition bearing effect can be obtained; the traction force direction formed by the connection of the lead wires 3 between the winding support structure 5 and the winding support structure 5 is a third direction, and the included angle between the third direction and the first direction is 1-179 degrees.

Further, as a preferred embodiment of the present utility model, the winding support structure 5 is a column structure, the column setting direction is identical to the winding axis setting direction, in order to avoid falling off from the end of the column when the wire 3 pulls the winding column, a wire blocking disc is provided at the end of the column facing away from the mounting portion mechanism 7 for preventing the wire 3 from falling off from the column. Preferably, the stand column is also provided with a wire slot, the wire 3 is uniformly wound on the stand column through the wire slot, so that the stand column is uniformly stressed, the wire slot can standardize the winding path of the wire 3, and the winding and unwinding operation of the winding and unwinding device is convenient.

Further, as a preferred embodiment of the present utility model, the winding support structure 5 is a block structure, and a through hole for the lead 3 to pass through is provided at a contact portion of the block structure and the lead 3, so that the traction force on the lead 3 is distributed on the winding support structure 5. Furthermore, in order to facilitate the pulling and retracting operation of the lead 3, the contact portion between the block structure and the lead 3 is configured as an arc surface structure, so as to reduce the sliding friction force between the contact portion between the lead 3 and the block structure. Preferably, a pulley structure is arranged at the contact part of the lead 3 and the block structure so as to convert sliding friction between the lead 3 and the block structure into rolling friction, thereby facilitating the winding and unwinding operation of the lead 3.

Further, as an alternative embodiment of the present utility model, the winding support structure 5 is a block structure, and a ring structure is provided at an end of the block structure, and the lead 3 is threaded through the ring structure to share the traction force on the lead 3 to the winding support structure 5. Of course, the winding support structure 5 may be a pulley structure, and the bottom of the pulley structure is fixed to the mounting portion mechanism 7, so that the traction force of the lead wire 3 is directly decomposed by the pulley structure.

Further, as a preferred embodiment of the present utility model, the mounting portion mechanism 7 is a force-bearing plate, and the force-bearing plate and the upper base 2 are both in a sheet structure, so as to facilitate the fixation of the upper base 2 and the mounting portion mechanism 7, and facilitate the connection and fixation between the mounting portion mechanism 7 and an external member.

Further, the lead 3 is a hauling rope, and the hauling rope is made of one or more of a steel wire rope, a nylon rope and a nanofiber rope. Preferably, the composite structure of various ropes is adopted, such as a steel wire rope is arranged inside the traction rope, the steel wire rope comprises a nylon rope or a nanofiber rope outside, the toughness and the strength of the traction rope are ensured, the light performance of the traction rope can be ensured, and the traction work of the winding and unwinding device is facilitated. The lead 3 is also made of an enhanced material of ACF bionic material.

As one embodiment of the present utility model, since the lead 3 from the first outlet 211 to the first inlet 213 is subjected to a certain level of step height, a protector against abrasion may be further provided.

As one embodiment of the utility model, the thickness of the wrapped ACF bionic material arranged on the adjusting part spool and the spool opening spool 2211 is preferably 0.5 mm-2 mm, and certain adjustment and change are carried out according to the specific adjustment of the object applied by the winding and unwinding device.

Further, the winding and unwinding device further comprises a telescopic structure connected with the lead wire 3, and the telescopic structure is preferably an elastic telescopic belt structure and comprises a telescopic member main body and at least one telescopic belt, wherein the telescopic belt is partially or completely connected with the telescopic member main body, so that the telescopic member main body can be contracted together with the telescopic belt when the adjusting device drives the telescopic belt to stretch. Similarly, the telescopic structure can also be adjusted according to the actual stretching requirement and the weight of the prefabricated connected weight, for example, a plurality of telescopic belts are arranged on the telescopic part main body so as to drive the telescopic part main body to stretch; or the whole telescopic body is wholly provided with an elastic band structure. The former can reduce the bearing force of each telescopic belt so as to avoid the stretching damage of the telescopic belt, and the latter is easy to be subjected to the weight of a heavy object or the change of the use environment in the practical application process so as to cause the telescopic structure to stretch.

Preferably, since the telescopic structure is connected to the lead 3, the lead 3 and the telescopic structure may be directly integrally provided without considering the complexity of the work of the lead 3 itself, that is, the wound portion of the lead 3 and the adjusting portion spool and the spool 2211 is in an inelastic structure, and the connected portion of the lead 3 and the outside is in an elastic rope structure, and the length adjustment and the elastic buffering are directly achieved through the lead 3.

Further, the folding and unfolding device of the utility model can be arranged on the backpack and comprises a backpack main body and shoulder belts arranged in pairs, and the folding and unfolding device is arranged on the backpack main body and is used for adjusting the length of the shoulder belts.

The backpack is a variable suspension backpack, the folding and unfolding device main body of the variable suspension backpack is not fixedly arranged on the backpack main body, the folding and unfolding device is arranged on the elastic structure and is connected with the backpack main body and the backpack shoulder strap through the elastic structure, the whole elastic structure can be lifted along with the backpack shoulder strap in the process of adjusting the backpack shoulder strap, the gravity center position of a user carrying the backpack can be effectively adjusted, and the optimal use comfort level is further achieved, meanwhile, the elastic structure can enable the user to form effective buffering when walking or moving, the instant pressure of the backpack shoulder strap on a human body is reduced, and the use comfort level of the backpack is further improved. Specifically, the specific structure of the changeable suspension backpack can be referred to the specific structure and the setting mode of the backpack and the retraction device in the adjustable suspension schoolbag with the patent number of CN202120914300.6 and the changeable suspension schoolbag with the patent number of CN 202120913064.6.

Specifically, the base of the retraction device is fixed on the back plate of the backpack, and the telescopic structure is correspondingly arranged with the shoulder straps. Wherein, base structure is fixed to be set up on the backplate of knapsack, but telescopic structure's extensible member main part sets up with the laminating of baldric, and the telescopic band wears to establish in the extensible member main part to when adjusting device adjusts the telescopic band length, the baldric can be together flexible along with the extensible member main part, and then realizes the flexible of baldric, in order to improve the travelling comfort that the user was born the knapsack.

As an alternative embodiment of the utility model, the retraction device can be fixedly arranged on the shoulder strap, and the stress decomposition mechanism is integrally arranged on the retraction device, so that the retraction device can ensure effective decomposition of the traction force by the stress decomposition mechanism in the process of adjusting the shoulder strap. Meanwhile, in order to maintain the balance of the backpack against the forces on the shoulders of the user during use, the retracting devices are preferably arranged in pairs and are respectively arranged on the two shoulder straps of the backpack.

Further, in order to ensure the comfort of the user when using the backpack, to avoid the contact feeling of the folding and unfolding device to the back of the user, a storage structure for accommodating the folding and unfolding device can be arranged on the backpack body, and an elastic cushion layer is arranged on the storage structure, so that the comfort of the backpack is improved. Of course, as an alternative, in order to avoid the contact feeling caused by the retraction device to deviate from the user, the retraction device may be disposed at the bottom of the back plate of the backpack.

The backpack with the folding and unfolding device can effectively adjust the length of the shoulder strap of the backpack by arranging the folding and unfolding device on the backpack main body, so that the backpack is suitable for users of different ages and heights, and the comfort of the backpack in use is ensured. Moreover, through set up telescopic structure on the baldric for but carry out elastic buffering through telescopic structure when the knapsack uses, and then reduce the knapsack and the pressure of the heavy object in the package to user's shoulder, improve the use travelling comfort of knapsack, with the load impact that buffering user bears, the backbone health of protection user.

The backpack in the preferred embodiment of the present utility model comprises a backpack body and two shoulder straps disposed on the back side of the backpack. The "back plate" of the backpack in the present utility model refers to a side that contacts the human body when the backpack is carried.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims (9)

1. A retraction device comprises,

a retraction adjusting part;

one end of the connecting piece is connected with the retraction adjusting part, and the other end of the connecting piece is used for being connected with an external piece to be retracted; and

the winding shaft is used for winding the connecting piece, and the connecting piece can wind around the winding shaft or reversely wind under the adjustment drive of the retraction adjusting part, so that an external piece connected with the connecting piece is driven to move, and retraction adjustment is realized;

it is characterized in that the retraction device further comprises,

an upper base (2), wherein the upper base (2) is provided with at least two wire inlets (213, 214) for receiving the leads (3) extending from the retraction adjusting part;

at least two wire coiling ports (22) are distributed on the upper base (2), the wire coiling ports (22) are provided with wire coiling port winding shafts (2211) for dragging and winding the lead wires (3), and the wire coiling ports are separated from the winding shafts of the winding and unwinding adjusting parts to bear the traction force of the lead wires (3);

the wire coil opening winding shaft (2211) is made of a flexible material with a thickness capable of absorbing and releasing impact force, and/or the first thickness of the flexible material with the impact force capable of absorbing and releasing is arranged on the periphery of the wire coil opening winding shaft (2211);

and/or;

the winding shaft of the winding and unwinding adjusting part is made of a flexible material with a thickness capable of absorbing and releasing impact force, and/or the winding shaft of the winding and unwinding adjusting part is circumferentially provided with a flexible material with a second thickness capable of absorbing and releasing impact force.

2. The winding and unwinding device according to claim 1, characterized in that a mounting part mechanism (7) is arranged under the upper base (2), and a plurality of winding supporting structures (5) are arranged on the mounting part mechanism (7) for carrying out the bearing of the traction force on the lead wires (3) extending from the winding and unwinding device.

3. The retractable device of claim 1 wherein the flexible material having impact absorbing release is ACF.

4. The retractable device of claim 1 wherein the outer layer of flexible material further comprises a housing for supporting the wire.

5. The folding and unfolding apparatus as claimed in any one of claims 1 to 4, characterized in that it is intended to be mounted with a backpack on which the winding support (5) is mounted in a distributed manner.

6. A retraction device according to claim 5, characterized in that the mounting means (7) are mounted to the back panel of the backpack and/or to the bottom surface of the backpack and/or to the shoulder straps of the backpack.

7. The retracting device according to claim 6, wherein the mounting part mechanism (7) is mounted to an upper shoulder strap of the backpack.

8. The retractable device according to any one of claims 6 or 7, wherein the retractable device comprises a lower base (4) for engaging with the upper base (2).

9. The retraction device according to claim 8, characterized in that the wire (3) is a non-elastic cord, an elastic cord, or a combination of non-elastic cords and elastic cords.