CN111213997A

CN111213997A - Suspension knapsack with prestretching type flexible connection system

Info

Publication number: CN111213997A
Application number: CN202010073447.7A
Authority: CN
Inventors: 苏业旺; 张懋熠; 郭亮; 魏延鹏
Original assignee: China Science And Technology Co Ltd
Current assignee: China Science And Technology Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-06-02

Abstract

The invention discloses a suspension backpack with a pre-stretching flexible connecting system, which comprises a backpack body carrying a load, a body side device connecting a body and the flexible connecting system connecting the backpack body and the body side device, wherein the backpack body can slide relative to the body side device through the flexible connecting system. The flexible connection system is a pre-stretched system, wherein the elastic assembly comprises at least a rotating turntable, a pre-stretched elastic element and a connection rope. The pre-stretching elastic element can drive the rotating turntable to rotate, so that the total stretching amount of the elastic component is increased and the total friction force of the elastic component is reduced in a limited space. The invention brings large pretension amount and small friction force for the flexible connection system, so that the load-reducing suspension backpack can bear small load (below 5 kg) and large load (above 5 kg), is suitable for full-frequency walking, and has obvious load-reducing effect.

Description

Suspension knapsack with prestretching type flexible connection system

Technical Field

The present invention relates to an ergonomic backpack, and more particularly, to a suspension backpack.

Background

When walking or running with a conventional backpack, the force exerted by the backpack on the body will have an acceleration force of the backpack in addition to the weight of the backpack. The acceleration force may be 2-3 times greater than gravity at maximum. Thus, when walking or running the joints are subjected to greater forces than when at rest, the muscles and joints are more susceptible to damage.

The acceleration force is related to the rolling motion of the buttocks. The up and down movement of the hips during walking can result in vertical movement of the backpack. The peak value of the acceleration force is related to the magnitude of the vertical movement of the backpack. Thus, the acceleration forces acting on the wearer can be reduced by reducing the amplitude of the vertical movement of the backpack. The acceleration force is reduced, so that the stress of joints can be reduced, the muscle damage can be avoided, the energy consumption of a bearer is reduced during walking, and the burden of the bearer is reduced.

The foreign scholars Rome developed a load reduction suspension backpack using bungee cords and pulleys as a flexible connection system (Rome, l.c., Rubber bands reduction of the cost of bearing loads. nature,444(7122),1023-1024, 2006). The related results have been applied for patent of invention by LIGHTNING PACKS corporation in 2007 (US2008185411A 1). The load-reducing suspension backpack is suitable for loads above 20 kg. Because the elastic rope and the pulley are adopted, the situation that one section of the elastic rope wound on the pulley is stretched and the other section of the elastic rope is not stretched can occur under small load, so that the natural frequency of the burden-reducing suspension backpack is increased, and the burden-reducing effect is reduced. Under the condition of small load, the flexible connecting system is blocked because the small load can not overcome the friction force of the flexible connecting system, namely, the load-reducing suspension backpack is degraded into a common backpack. Under heavy load, the elastic component has insufficient stretching space, so that a good load reduction effect cannot be easily obtained when the user walks at low frequency.

In China, south China university of Engineers applied for several inventions (CN107588312A, CN107594857A, CN107616617A, CN108887863A) with similar structure for burden-reducing backpacks or devices, which are basically consistent with the principle adopted by US patent 2008185411A1, and the adopted flexible connection system has a structure similar to that of US patent US2008185411A 3538, so that the inventions not only have the defects in US patent US2008185411A1, but also have other problems. For example, when the backpack is stationary, the stretching length of the spring is too long, the backpack can fall from the position of the back to the position of the hip, or the total length of the stretching rope and the stretching spring is at most as long as that of the back plate after stretching, so that the stretching space is limited, and good load reduction effect cannot be achieved at all.

In the prior application CN110150840A of the present applicant, a precompression type compression spring is used as an elastic element, which saves space and can achieve a good suspension effect. However, the compression state of the compression spring still occupies a certain space, so that the amount of expansion and contraction of the compression spring as the elastic element is limited, and it is difficult to achieve a good suspension effect when walking slowly. Although the use of a fixed pulley is avoided and a part of friction force is reduced, friction exists between the compression spring and the support rod, and the device is not well suitable for the condition of small load.

The burden reduction backpack aims at various defects of the burden reduction backpack in the prior art, such as the backpack can only bear heavy load, is only suitable for high-frequency fast walking, and has large occupied space and poor burden reduction effect. The invention designs the load-reducing suspension backpack, which brings large pre-stretching amount and small friction force to the flexible connection system, so that the load-reducing suspension backpack can bear small load (below 5 kg) and large load (above 5 kg), is suitable for full-frequency walking, and has obvious load-reducing effect.

Disclosure of Invention

The invention mainly aims to provide a suspension backpack with a pre-stretching flexible connecting system, which adopts a rotary turntable and a pre-stretching elastic element as the pre-stretching flexible connecting system, and solves the technical problems that the existing load-reducing suspension backpack can only bear small load, is only suitable for high frequency, occupies large space and has poor load-reducing effect.

In order to realize the purpose, the following technical scheme is adopted:

a suspension backpack with a pre-stretched flexible connection system comprising a backpack body carrying a load, a body side device connecting the body and a flexible connection system connecting the backpack body and the body side device, the backpack body being slidable relative to the body side device by the flexible connection system, the flexible connection system comprising an elastic component,

the method is characterized in that: the elastic component at least comprises a rotary turntable, an elastic element and a connecting rope; the connecting rope is wound on the rotary turntable, one end of the connecting rope is fixed on the rotary turntable, the other end of the connecting rope is connected with the backpack body, the rotary turntable is fixed on the body side device, the elastic element is a pre-stretching elastic element and is a force accumulation structure with pre-stretching force initially, the elastic element is connected with the rotary turntable and can drive the rotary turntable to rotate, and the total stretching amount of the elastic assembly is increased and the total friction force of the elastic assembly is reduced in a limited space.

Further, the rotary turntable comprises a rotary turntable inner ring and a rotary turntable outer ring.

Further, the elastic element is connected with the inner ring of the rotary turntable through a pull rope, and the pull rope is wound and fixed on the inner ring of the rotary turntable.

Further, the elastic element is an extension spring or an elastic rope, and preferably, the elastic element is a plurality of elastic elements connected in parallel.

Further, the flexible connection system further comprises a sliding rail assembly, the sliding rail assembly comprises sliding rails and adaptive sliding pieces, the sliding pieces can slide on the sliding rails, the two sliding rail assemblies are respectively located on the left side and the right side of the elastic assembly, and the other end of the connecting rope is specifically connected with the sliding pieces.

Furthermore, the top end of the sliding piece is connected with the backpack body, so that the other end of the connecting rope is connected with the backpack body through the sliding piece, and the sliding rail assembly is fixedly connected with the body side device.

Further, the elastic component further comprises at least one fixed pulley for changing the stretching direction of the connecting rope, the connecting rope is wound on the fixed pulley to connect the rotating turntable and the sliding part, preferably, the connecting rope is a steel wire rope, and more preferably, the number of the fixed pulleys is two.

Further, the flexible connection system further comprises a locking mechanism for realizing the opening and closing of the suspension function of the backpack.

Furthermore, the backpack body comprises a backpack body, a connecting plate and a lining strip, the lining strip is arranged inside the backpack body, the connecting plate is arranged outside the backpack body, and the connecting plate and the lining strip clamp the inner surface of the backpack body to fix the backpack body on the connecting plate.

Further, the body side device comprises a harness, a back panel and a pad, preferably a waist belt.

Furthermore, the burden-reducing suspension backpack is suitable for bearing small loads below 5kg and is suitable for full-frequency walking.

Compared with the prior art, the invention has the following advantages and beneficial effects:

firstly, the flexible connecting system is a pre-stretching system, the core of the elastic component is a rotating turntable and a pre-stretching elastic element, and the total stretching amount of the elastic component determines the burden reduction effect of the burden reduction suspension backpack. The prior art mainly adopts an elastic rope and pulleys as a flexible connecting system, the elastic rope is used as an elastic element in the elastic connecting system and needs to be wound back and forth on a plurality of pulleys, and therefore the total stretching amount of the elastic connecting system is limited by the number of the pulleys and the overall size of the burden-reducing suspension backpack. This application ingenious adoption have the rotatory carousel structure of inner ring and outer loop, and it not only can twine numerous circles and connect the rope, still plays the effect of lever to enlarge elastic element's total tensile volume, consequently compare in prior art rotatory carousel can increase elastic component's total tensile volume by a wide margin in finite space.

Secondly, the prior art mainly adopts stretch cord and pulley as flexible connection system, needs more than 3 pulleys to realize the function basically, and along with the increase of pulley number, frictional force also can increase. The flexible connection system of the invention also adopts a pre-stretching elastic element, in particular to an extension spring, so that the flexible connection system can realize functions only by a small number of pulleys (1-2), the number of the pulleys is obviously reduced, and particularly when the connection rope adopts a steel wire rope, the friction force between the steel wire rope and the pulleys is obviously smaller than the friction force between the elastic rope and the pulleys, thereby effectively reducing the total friction force of the flexible connection system.

Third, the load applied to the load-reducing suspension backpack in the prior art is not explicitly mentioned, and it is known from the literature that the load is generally applied to loads above 20 kg. Because the prior art mainly adopts the elastic rope and the pulley as a flexible connecting system, the situation that one section of the elastic rope wound on the pulley is stretched and the other section is not stretched can occur, so that the natural frequency of the burden-reducing suspension backpack is increased, the burden-reducing effect is reduced, and the situation is more obvious under the condition of small load (below 5 kg). Under the condition of small load, the flexible connecting system is blocked because the small load can not overcome the friction force of the flexible connecting system, namely, the load-reducing suspension backpack is degraded into a common backpack. Therefore, the load-reducing suspension backpack in the prior art is not suitable for bearing small loads. The invention adopts the rotary turntable and the connecting rope as the flexible connecting system, so that the situation of partial failure of the elastic element can not occur even under small load no matter the load is large, and the load-reducing suspension backpack can not be degraded into a common backpack.

Fourth, the prior art mainly uses elastic cords and pulleys as the flexible connection system, so the total tension of the elastic assembly is limited, and the total tension determines the natural frequency of the burden-reducing suspension backpack. To obtain a good burden-reducing effect, the natural frequency of the burden-reducing suspension backpack is required to be far less than the walking frequency. Therefore, the burden-reducing suspension backpack in the prior art cannot achieve an obvious burden-reducing effect under the full-frequency walking. The rotating turntable and the pre-stretching elastic element are adopted as a flexible connection system, the total stretching amount is almost not limited, so that the device can be suitable for the full-frequency walking of a human body, namely all frequencies from slow walking to fast running of the human body are covered, and the load reduction effect is obvious.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic view of the overall construction of the flexible connection system of the present invention;

FIG. 4 is an exploded view of the backpack body of the present invention;

FIG. 5 is a schematic view of a body side assembly according to the present invention;

FIG. 6 is a schematic view of an unlocked state and a locked state of a locking mechanism according to an embodiment of the present invention;

FIG. 7 is an elevation view of the flexible connection system of the present invention with the locking mechanism removed;

FIG. 8 is a front view of the elastomeric component of the present invention;

fig. 9 is a three-view diagram of the rotary disk of the present invention.

In the figure, 101-backpack body; 102-a flexible connection system; 103-a body side device; 1-inclusion; 2-lining strip; 3-connecting the plates; 4-a slide rail; 5-a slide; 6-fixed pulley; 7-a steel wire rope; 8-rotating the turntable; 9-pulling a rope; 10-a fixed shaft; 11-a locking body portion; 12-a locking switch; 13-a back plate; 14-shoulder straps; 15-extension spring; 16-rotating the inner ring of the turntable; 17-rotating the outer ring of the turntable.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The suspension knapsack is a forced vibration system, and its purpose is to reduce the amplitude of the knapsack during walking. The flexible attachment system is the spring element in the spring damping system and the backpack body is the inertial element in the spring damping system. The body on foot exerts an exciting force on the spring damper system, and the backpack is forced to vibrate. The amplitude of the backpack is related to the ratio of the natural frequency to the excitation frequency. The smaller the ratio of the natural frequency of the load-reducing suspension backpack to the walking frequency of the wearer, the smaller the amplitude of the backpack. When the backpack is static, the larger the stretching amount of the elastic element in the flexible connecting system is designed, the smaller the natural frequency of the burden reduction suspension backpack is, the smaller the amplitude of the backpack is, and the better the burden reduction effect is. Therefore, the structural design of the flexible connection system is of great importance.

As shown in fig. 1, the present invention is a suspension backpack having a pre-stretched flexible attachment system.

As shown in fig. 2, the load-reducing suspension backpack includes a body-side device 103 connected to the body, a backpack body 101 for carrying a weight, and a flexible connection system 102 for connecting the two. The backpack body 101 is slidable relative to the body side device 103 by means of a flexible connection system 102.

As shown in fig. 5, the backpack body 101 includes a backpack body 1, a lining strip 2 and a connecting plate 3, the lining strip 2 is disposed at an inner side of the backpack body 1, the lining strip 2 may be disposed at two sides of the backpack body, the connecting plate 3 is fixedly connected to the lining strip 2, and the inner surface of the backpack body is clamped together, so that the backpack body 1 is fixed on the connecting plate 3. Further, the connecting plate 3 is fixedly connected to the sliding member 5 of the flexible connecting system 102 by screws or bolts, so as to realize the connection between the backpack body 101 and the flexible connecting system 102.

As shown in fig. 6, the body-side device 103 includes a back plate 13 and shoulder straps 14, and may be provided with a waist belt. The back plate 13 is provided with a plurality of grooves and holes for corresponding fixed connection with the components in the flexible connection system 102, and the connection manner may be screws or bolts. Shoulder straps 14 are attached directly to back plate 13. Topology optimization techniques can be used to optimize the structure and reduce the weight of the backing plate 14.

As shown in fig. 3, the flexible connection system 102 includes a spring assembly, a track assembly, and a locking mechanism. Wherein, elastic component and slide rail set spare pass through the wire rope 7 in the elastic component and link to each other. The locking mechanism achieves the closing of the suspension function by catching the slider 5 in the slide rail assembly. The elastic assembly, the slide rail assembly and the locking mechanism are all mounted on the back plate 13 of the body side device 103.

As shown in fig. 7, the flexible connection system 102 at least includes an elastic component and two sets of slide rail components, where the two sets of slide rail components include a slide rail 4 and a slide element 5, and the two sets of slide rail components are respectively located at the left and right sides of the elastic component.

As shown in fig. 8, the elastic assembly includes an extension spring 15, a rotary turntable 8, a fixed pulley 6, a wire rope 7 and a pull rope 18, wherein the rotary turntable 8 includes a fixed shaft 10, a rotary turntable inner ring 16 and a rotary turntable outer ring 17, and the wire rope 7 includes a right wire rope 7-1 and a left wire rope 7-2. The fixed pulley 6 includes two pulleys, i.e., a left pulley and a right pulley, which are located on both left and right sides of the rotary table 8 and are located above the guide rail 4.

One end of the tension spring 15 is fixed on the back plate 13 of the body side device 103, the other end is connected with a pull rope 18, and the other end of the pull rope 18 is wound and fixed on the inner ring 16 of the rotary turntable. In this embodiment, the convex part in the middle of the rotary turntable is an inner ring 16 of the rotary turntable, and the outermost periphery of the rotary turntable is an outer ring 17 of the rotary turntable, which is coaxial with the inner ring 16 and rotates synchronously (fig. 9). In order to ensure the stretching length, one end of the right steel wire rope 7-1 is fixed on the outer ring 17 of the rotary turntable and is wound by a plurality of circles. The direction of the right wire rope 7-1 is changed by the fixed pulley 6 on the right side, and finally the other end is tied on the sliding piece 5 on the same side. Similarly, the left side is also provided with a left wire rope 7-2 and a left fixed pulley 6. When the sliding part 5 slides downwards, the steel wire ropes 7-1 and 7-2 on the same side are driven to move downwards, the steel wire ropes 7-1 and 7-2 drive the outer ring 17 of the rotary turntable to rotate, and at the same time, the inner ring 16 of the rotary turntable also rotates synchronously. The rotation of the inner ring 16 of the rotary turntable drives the pull rope 18 to move upwards, and at the same time, the extension spring 15 is stretched. The rotary turntable outer ring 17 and the rotary turntable inner ring 16 have the same action and lever, and are used for amplifying the stroke of the extension spring 15 and reducing the elastic coefficient of the whole elastic assembly. In order to avoid that the backpack is lowered too far when loaded, the tension spring 15 in the flexible connection system is already stretched, i.e. the elastic element is pre-stretched, when the backpack is unloaded, the flexible connection system being of the pre-stretched type.

As shown in fig. 3, the slide rail assembly includes two sets of slide rails 4 and a sliding element 5, the two sets of slide rail assemblies are respectively located at the left and right sides of the elastic assembly, the slide rails 4 are fixed on the back plate 13 of the body side device 103, each slide rail 4 is assembled with the sliding element 5, and the sliding element 5 can slide up and down in the slide rail 4. The top surface of the sliding part 5 is fixedly connected with the connecting plate 3 in the backpack body 101 to drive the backpack body 101 to slide vertically or move vertically.

As shown in fig. 3 and 6, a locking mechanism is also provided in the flexible connection system 102 in order to facilitate the control of the sliding of the slider 5. The locking mechanism comprises a locking main body part 11 and a locking switch 12, wherein the locking main body part 11 comprises a driving lever, a lower cover, a rotating lever, a connecting rod, a positioning clamp, a spring part and clamping tongues, and the four clamping tongues in the locking main body part 11 are driven to extend towards two sides respectively and enter a locking state by downwards shifting the locking switch 12. The protrusion of the sliding member 5, which is still moving up and down, presses the latch, and under the action of the spring member, the latch in the locking mechanism 11 contracts inward, so that the protrusion of the sliding member 5 is caught between the two latches on the same side, locking the slide rail assembly, and preventing the sliding member 5 from sliding (as shown in fig. 6). The locking mechanism is not limited to the above-described configuration described in the embodiment, and any component capable of realizing the locking function may be used.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A suspension backpack with a pre-stretched flexible connection system, comprising a backpack body (101) carrying a load, a body side device (103) connecting the body, and a flexible connection system (102) connecting the backpack body (101) and the body side device (103), the backpack body (101) being slidable relative to the body side device (103) via the flexible connection system (102), the flexible connection system (102) comprising an elastic component,

the method is characterized in that: the elastic component at least comprises a rotary turntable (8), an elastic element and a connecting rope (7); the connecting rope (7) is wound on the rotary turntable (8), one end of the connecting rope (7) is fixed on the rotary turntable (8), the other end of the connecting rope is connected to the backpack body (101), the rotary turntable is fixed on the body side device (103), the elastic element is a pre-stretching elastic element and is a force storage structure with pre-stretching force initially, the elastic element is connected with the rotary turntable and can drive the rotary turntable to rotate, and the total stretching amount of the elastic assembly is increased and the total friction force of the elastic assembly is reduced in a limited space.

2. The suspension backpack with a pre-stretched flexible connection system according to claim 1, characterized in that: the rotary turntable (8) comprises a rotary turntable inner ring and a rotary turntable outer ring.

3. The suspension backpack with a pre-stretched flexible connection system according to claim 2, characterized in that: the elastic element is connected with the inner ring (8) of the rotary turntable through a pull rope (18), and the pull rope (18) is wound and fixed on the inner ring of the rotary turntable.

4. The suspension backpack with a pre-stretched flexible connection system according to claim 1, characterized in that: the elastic element is an extension spring (15) or an elastic rope, and preferably, the elastic element is a plurality of elastic elements connected in parallel.

5. A floating backpack with a pre-stretched flexible connection system according to any of the claims 1-4, characterized in that: the flexible connection system (102) further comprises a sliding rail assembly, the sliding rail assembly comprises sliding rails and adaptive sliding pieces, the sliding pieces can slide on the sliding rails, the two sliding rail assemblies are respectively located on the left side and the right side of the elastic assembly, and the other end of the connection rope (7) is specifically connected with the sliding pieces.

6. The suspension backpack with a pre-stretched flexible connection system according to claim 5, characterized in that: the top end of the sliding part is connected with the backpack body (101), so that the other end of the connecting rope (7) is connected with the backpack body through the sliding part, and the sliding rail assembly is fixedly connected with the body side device (103).

7. The suspension backpack with a pre-stretched flexible connection system according to claim 5, characterized in that: the elastic assembly further comprises at least one fixed pulley (6) for changing the stretching direction of the connecting rope (7), the connecting rope (7) is wound on the fixed pulley (6) to connect the rotary turntable and the sliding piece, preferably, the connecting rope (7) is a steel wire rope, and more preferably, the number of the fixed pulleys (6) is two.

8. A floating backpack with a pre-stretched flexible connection system according to any of the claims 1-4, characterized in that: the flexible connection system (102) further comprises a locking mechanism for enabling the suspension function of the backpack to be turned on and off.

9. A floating backpack with a pre-stretched flexible connection system according to any of the claims 1-4, characterized in that: the backpack body (101) comprises a backpack body, a connecting plate and a lining strip, wherein the lining strip is arranged inside the backpack body, the connecting plate is arranged outside the backpack body, and the connecting plate and the lining strip clamp the inner surface of the backpack body to fix the backpack body on the connecting plate.

10. A floating backpack with a pre-stretched flexible connection system according to any of the claims 1-4, characterized in that: the body side device (103) comprises a harness, a back panel and a pad, preferably a waist belt, more preferably the load reducing suspension backpack is adapted to carry a small load of less than 5kg, suitable for full frequency walking.