Auxiliary system for relieving limb load

Abstract

The invention relates to the technical field of human health auxiliary equipment, in particular to an auxiliary system for relieving limb load. The system comprises an upper limb burden alleviating mechanism and a movable seat mechanism. The upper limb load reducing mechanism balances the dead weight of the operation tool and reduces the continuous load of the upper limbs through a supporting frame, a fixed pulley, a connecting rope and an adjustable counterweight assembly; the mechanism further comprises an arm fixing assembly used for fixing the tool and a friction thrust baffle. The movable seat mechanism achieves convenient switching between movement and stability through a chassis, universal wheels, a cushion assembly and a linkage locking assembly. When an operator leans backwards on a seat, supporting legs are automatically driven to swing downwards to be locked through mechanical linkage. And when inclining forwards or leaving, the device automatically unlocks and recovers movement. The device adopts a pure mechanical structure, is low in cost and convenient to maintain, can provide full-dimensional load reduction for upper limbs and lower limbs without modifying a production line, can effectively reduce the occupational disease risk of operators, and improves the operation comfort and continuity.

Description

Technical Field

[0001] This invention relates to the field of assistive devices for human health, and in particular to an assistive system for reducing the load on limbs. Background Technology

[0002] In modern industrial production, especially in industries such as machinery manufacturing and food processing, assembly line operations are prevalent. These operations typically require operators to perform the same actions repeatedly for extended periods or to remain standing or walking for long periods. This high-intensity, repetitive work pattern easily leads to strain on the upper limbs such as fingers, arms, and shoulders, as well as fatigue in the lower limbs such as feet and legs. It can even cause occupational diseases such as tenosynovitis, frozen shoulder, and varicose veins in the lower limbs, seriously affecting the operator's health and work efficiency.

[0003] Existing industrial auxiliary load reduction equipment is mostly a complex electronic control or intelligent system, which is expensive and requires large-scale transformation of existing production lines. This is difficult for many small and medium-sized enterprises to afford, both economically and technically, resulting in significant barriers to the popularization and implementation of load reduction equipment.

[0004] Meanwhile, many assembly line workstations are cramped, requiring operators to move frequently between workstations. Traditional fixed chairs are unsuitable for this "small space + frequent movement" scenario, making it difficult for operators to find a comfortable and convenient working posture during long hours, and also hindering their movement.

[0005] Therefore, there is an urgent need for a tool to reduce the burden on the upper and lower limbs of operators, while being adaptable to narrow, frequently moving assembly line workstations, and a cost-effective and easy-to-implement auxiliary system to improve operators' working conditions, reduce the risk of occupational diseases, and enhance the sustainability of operations. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary system for reducing limb load. This system can effectively reduce the continuous force burden on the upper limbs, provide lower limb support for operators who move frequently in confined assembly line operations, and is cost-effective, thereby improving the working conditions of operators, reducing the risk of occupational diseases, and enhancing the sustainability of operations.

[0007] The technical solution adopted in this invention is: an assistive system for reducing limb load, the assistive system including an upper limb load reduction mechanism and a movable seat mechanism.

[0008] The upper limb load reduction mechanism includes: a support frame, on which at least one set of fixed pulleys is provided, each set of fixed pulleys including at least two fixed pulleys and a connecting rope wound around it.

[0009] The first end of the connecting rope is connected to a counterweight assembly, and the second end of the connecting rope is used to connect to the operating tool via a connecting assembly.

[0010] The weight of the counterweight assembly is configured to balance the weight of the operating tool and the connecting assembly, thereby offsetting most of the operating tool's own weight.

[0011] The movable seat mechanism includes: a chassis, a lifting column mounted on the chassis, a seat cushion assembly mounted on the upper end of the lifting column, and a linkage locking assembly mounted on the seat cushion assembly.

[0012] The chassis is equipped with multiple casters at the bottom.

[0013] The linkage locking component is configured to: trigger a locking action to fix the movable seat mechanism in response to a user sitting on the seat cushion component and leaning back; and release the lock to allow the movable seat mechanism to move in response to a user leaning forward or leaving the seat cushion component.

[0014] The seat cushion assembly includes a base plate, a seat cushion disposed on the base plate, and a backrest.

[0015] The backrest is fixedly connected to the rear of the base plate by at least one L-shaped connecting plate; two backrests are symmetrically arranged, and a pivot is provided between the backrests.

[0016] The linkage locking component includes: Support legs, the lower end of which is used to contact the ground.

[0017] An L-shaped connecting vertical plate is fixed to the rear end of the base plate. The upper end of the support leg is tightly connected to the connecting vertical plate by bolts and pressure plates. Loosening the bolts and pressure plates allows adjustment of the ground clearance of the lower end of the support leg to coordinate forward and backward tilting movements.

[0018] A swing arm, the middle of which is rotatably connected to the pivot, the swing arm having an upper trigger portion located above the pivot and a lower linkage portion located below the pivot.

[0019] The connecting ring is a rectangular ring structure. One end of the connecting ring is rotatably connected to the lower linkage part, and the other end is rotatably connected to the upper part of the support leg.

[0020] Both the base plate and the connecting vertical plate are elastic.

[0021] When a user sits on the seat cushion assembly and leans back, the rear end of the base plate is pressed down and moves in a circular motion around the connection point between the base plate and the lifting column, thereby causing the lower end of the support leg to move downward and closer to the lifting column. At the same time, the user's back applies pressure to the upper trigger part of the swing rod, forcing the swing rod to rotate around the pivot. The rotation of the swing rod is transmitted through its lower linkage and the connecting ring, pulling the support leg so that the lower end of the support leg moves away from the lifting column. The two actions work together until the lower end of the support leg firmly contacts the ground, thereby achieving mechanical locking of the entire movable seat mechanism. When the user leans forward, the supporting leg lifts up under the deformation restoring force of the base plate and the connecting vertical plate, and the swing rod returns to its original position, releasing the lock.

[0022] The connection component may include: At least two long hoops are used to clamp the operating tool, and the long hoops are locked in place by fasteners. A connecting loop is provided on the long hoop at the front end for connecting the second end of the connecting rope.

[0023] It also includes an arm fixation mechanism, which comprises at least one pair of clamping sleeves, the rear ends of which are hinged together, and the front ends of which are provided with interlocking buckles for opening and closing. The arm fixation mechanism is connected to the long hoop or the fastener located at the rear end via a connecting arm, for binding and fixing the operating tool to the user's arm. A cushioning pad is provided on the inner side of the clamping sleeve.

[0024] The upper limb load-bearing mechanism may also include a locking device, which is disposed on the support frame and acts on the connecting rope to fix the position of the connecting rope.

[0025] It also includes a friction thrust baffle, which is disposed below the support frame; the friction thrust baffle includes a base plate, two diagonal bolts and two straight bolts, a friction rubber pad is provided at the bottom of the base plate, and four threaded holes are provided on the base plate, distributed in pairs at both ends of the base plate, and rubber buffer sleeves are fitted on the surface of the two diagonal bolts.

[0026] Furthermore, the support frame is equipped with a multi-functional panel.

[0027] Furthermore, the support frame is provided with an air outlet.

[0028] Compared with the prior art, the beneficial effects of the present invention are: 1. The upper limb load-bearing mechanism uses counterweights to offset the weight of the operating tools, significantly reducing the continuous strain on the fingers, arms, and shoulders, and alleviating strain caused by holding tools and repetitive operations. The movable seat mechanism solves the fatigue of prolonged standing / walking in the feet and legs, and supports multiple postures for stable working while seated and moving. Because the operator straddles the seat with their feet on either side, the seat is very stable with leg support. Its relatively small chassis dimensions make it suitable for confined spaces and assembly line scenarios. Overall, it reduces the labor intensity of the operator's hands, fingers, arms, shoulders, legs, and feet without affecting the original work efficiency.

[0029] 2. To address the high demand for long-term work, this invention employs a simple and reliable mechanical structure, eliminating the need for complex electrical controls and ensuring stable support for extended operations. Its movable design perfectly complements the rhythm of frequently moving assembly lines, occupying minimal space while moving synchronously with the operator. This avoids the space limitations of fixed seating, guaranteeing operational continuity and efficiency.

[0030] 3. Due to its design primarily based on mechanical components, the system's structure and maintenance are relatively simple, resulting in low overall manufacturing costs. This design requires minimal modification to existing production lines and allows for flexible deployment.

[0031] 4. It directly relieves upper limb strain and lower limb fatigue caused by prolonged repetitive operations, standing / walking, etc., thereby helping to reduce the risk of related occupational diseases and improve the working conditions of operators. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the connection component and the arm fixing mechanism. Figure 4 This is a front view of the seat cushion assembly and the linkage locking assembly; Figure 5 This is a schematic diagram of the seat cushion assembly and the linkage locking assembly. Figure 6 This is a schematic diagram of the friction thrust baffle structure; Figure 7 This is a schematic diagram of a support frame structure with two horizontal bars; Figure 8 Schematic diagram of the modified pneumatic hammer structure; Figure 9 This is a schematic diagram of the internal structure of the movable hammer; Figure 10 A schematic diagram of the push plate as a suspended working platform; Figure 11 This is a schematic diagram of the electromagnetic hammer structure.

[0033] In the diagram: 1-Support frame; 2-Fixed pulley; 3-Connecting rope; 4-Counterweight assembly; 5-Connecting assembly; 51-Long hoop; 52-Fastener; 53-Connecting ring; 6-Chassis; 61-Universal wheel; 7-Lifting column; 8-Seat cushion assembly; 81-Base plate; 82-Seat cushion; 83-Backrest; 84-Connecting plate; 9-Linkage locking assembly; 91-Support leg; 92-Swing rod; 921-Rotating shaft; 922-Upper trigger part; 923-Lower linkage part; 93-Connecting rotating ring; 94-Pressure plate; 95-Connecting vertical plate; 10-Arm fixing mechanism; 101-Clamping sleeve; 102-Connecting... 103-Blocking arm; 104-Snap fastener; 11-Locking device; 12-Friction rubber pad; 13-Friction thrust baffle; 131-Base plate; 132-Angled bolt; 133-Blocking sleeve; 134-Straight bolt; 14-Modified pneumatic hammer; 141-Pneumatic hammer body; 142-Hammer body shell; 143-Moving hammer; 144-Hammer handle; 145-Check block; 146-Return spring; 147-Positioning spring; 148-Button switch; 15-Multi-function panel; 16-Air outlet; 17-Electromagnetic hammer; 171-Push-pull electromagnet; 172-Positioning spring two. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] As shown in the figure, an assistive system for reducing limb load is mainly composed of an upper limb load reduction mechanism and a movable seat mechanism.

[0036] The upper limb load reduction mechanism is used to reduce the burden on the operator's upper limbs caused by the weight of the operating tool.

[0037] like Figure 1 and Figure 2 As shown, its core components include a support frame 1. A support plate is provided at the bottom of the support frame 1, allowing it to be stably placed on the workbench. A crossbar is provided at the top of the support frame 1 for mounting a fixed pulley 2.

[0038] like Figure 1 As shown, in one embodiment of the present invention, a horizontal single crossbar is provided at the top of the support frame 1. This structure is simple, has low manufacturing cost, occupies little longitudinal space, and is suitable for scenarios with relatively light loads or extremely compact working spaces. At least two fixed pulleys 2 are provided on the single crossbar.

[0039] A connecting rope 3 is wound around the selected fixed pulley 2. When multiple sets of fixed pulleys are used, each set of fixed pulleys corresponds to an independent connecting rope and counterweight assembly.

[0040] The first end of the connecting rope 3 is connected to a counterweight assembly 4. The second end of the connecting rope 3 is used to connect the operating tool via a connecting assembly 5. The weight configuration of the counterweight assembly 4 is designed to basically balance the weight of the operating tool and the connecting assembly 5, thereby significantly reducing the load borne by the operator. The counterweight assembly is typically a sandbag filled with sand, and its weight can be easily and quickly adjusted by adding or removing sand.

[0041] like Figure 7 As shown, in another embodiment of the invention, the top of the support frame 1 is provided with multiple (e.g., two) crossbars arranged in a cross configuration. Two sets of independent fixed pulleys 2 can be installed on the two crossbars. For example, one set of fixed pulleys is installed on one crossbar for use with an angle grinder, and another set of fixed pulleys is installed on the other crossbar for use with a pneumatic hammer. This layout allows multiple tools to be suspended independently and switched quickly, adapting to complex work processes that require the alternating use of multiple heavy tools.

[0042] As a preferred passive safety design, when installing the fixed pulley 2, the horizontal distance from the intersection of the crossbar and the support column of the support frame 1 to the working position of the operating tool should be less than the horizontal distance from the suspension position of the counterweight assembly 4. In extreme cases, if the support frame 1 accidentally becomes unstable, it will naturally tilt towards the counterweight assembly 4 (i.e., away from the operator), thereby greatly reducing the risk of injuring the operator.

[0043] like Figure 3 As shown, the function of the connecting component 5 is to securely and reliably fix the connecting rope 3 to the operating tool.

[0044] In a preferred embodiment, the connecting assembly 5 includes at least two long hoops 51, which can tighten the operating tool. The long hoops 51 are locked by fasteners 52 (e.g., bolts, clips, etc.) to ensure a secure connection. A connecting ring 53 is provided on the long hoop 51 at the front end, which is used to connect the second end of the connecting rope 3.

[0045] To further distribute the force and alleviate the burden on the operator's fingers, an arm fixation mechanism 10 can also be installed.

[0046] The arm securing mechanism 10 includes at least one pair of clamping sleeves 101. The rear ends of the pair of clamping sleeves 101 are hinged together, allowing them to open and close around the hinge point; their front ends are provided with interlocking buckles 104 for easy opening and closing, facilitating the operator's donning and removal. The clamping sleeves 101 are connected to the long hoop 51 or the fastener 52 located at the rear end via a connecting arm 102, thereby securing the operating tool to the user's arm. To improve wearing comfort, a cushioning pad 103 is provided on the inner side of the clamping sleeves 101.

[0047] like Figure 1 As shown, the upper limb load-reducing mechanism may further include a locking device 11. This locking device 11 is mounted on the support frame 1 and acts on the connecting rope 3. Its function is to fix the position of the connecting rope 3. When the operator needs to change operating tools or adjust the weight of the sandbag, the locking device 11 can be used to lock it, preventing the connecting rope 3 from slipping out of the pulley or the counterweight sandbag from suddenly falling. The locking device can be a push-pull type locking clamp.

[0048] like Figure 8 and Figure 9As shown, as a specific example of tool application, the operating tool can be a modified pneumatic hammer 14. The modified pneumatic hammer 14 includes a pneumatic hammer body 141, a hammer shell 142, a movable hammer 143, and a hammer handle 144. The movable hammer 143 is disposed inside the hammer shell 142, with its upper and lower ends extending to the outer sides of the upper and lower ends of the hammer shell 142. A check block 145 is provided on the movable hammer 143, and the bottom of the check block 145 is connected to the inside of the hammer shell 142 via a return spring 146. The upper part of the hammer shell 142 is fixed to the outer side of the output end of the pneumatic hammer body 141. A positioning spring 147 is also provided on the lower part of the hammer shell 142. The hammer handle 144 is disposed on the hammer shell 142 for the operator to hold. A push-button switch 148 is provided on the hammer handle 144, and the push-button switch 148 is electrically connected to the solenoid valve at the input end of the pneumatic hammer body 141. The upper hammer inside the pneumatic hammer body 141 is short and thick, and is an integral structure with the piston. Its return spring is relatively thick. Due to the large contact area between the upper hammer piston and the outer shell, its stroke is designed to be small in order to protect the piston and the return spring. The movable hammer 143 is long and thin, and is located inside the hammer body shell 142, with its upper and lower ends extending to the outer sides of the upper and lower ends of the hammer body shell 142. The long and thin movable hammer 143 has a small contact area with the inner wall of the hammer body shell 142 when it moves, thus allowing for a larger stroke. A check block 145 is provided on the movable hammer 143, and the bottom of the check block 145 is connected to the inside of the hammer body shell 142 through a return spring 146. The upper part of the hammer body shell 142 is fixed to the outside of the output end of the pneumatic hammer body 141, and the diameter of the lower end of the upper hammer at the output end of the pneumatic hammer body 141 is larger than the top opening diameter of the hammer body shell 142, so that the stroke of the upper hammer is limited by this shell structure. Through the above design, the upper hammer piston stroke inside the pneumatic hammer body 141 is short, reducing the heat generated by motion friction and preventing damage to the upper hammer return spring 146 due to excessive compression. The impact energy is transferred through the short-stroke, large-contact-area upper hammer to the slender, long-stroke movable hammer 143, ultimately striking the workpiece. A positioning spring 147 is also provided at the lower part of the hammer body shell 142. This positioning spring 147 has a dual function: first, it is used to adjust the hammering force. When the spring is lightly pressed, the movable hammer stroke is large, and the kinetic energy consumed to overcome the return spring 146 is large. When the spring is pressed down forcefully, the movable hammer stroke is small, and the kinetic energy consumed to overcome the return spring 146 is small. Second, it is used for aiming and maintaining a stable point of force. The hammer handle 144 is set on the hammer body shell 142 for the operator to hold. A push-button switch 148 is provided on the hammer handle 144. The push-button switch 148 is fixedly connected to the solenoid valve at the input end of the pneumatic hammer body 141 and is used to control the hammering action. This structure, through the cooperation of the hammer shell 142 and the movable hammer 143, enables the controllable transmission and adjustment of the output impact of the pneumatic hammer body 141, achieving a striking effect that reduces impact force, makes the force gentler and easier to control, and effectively prevents the workpiece from being damaged during operation.

[0049] Furthermore, considering that some delicate operations or assembly processes require a gentler, more controlled striking force, this system can also be adapted to an electromagnetic hammer 17. For example... Figure 11 As shown, the electromagnetic hammer 17 includes a push-pull electromagnet 171 and a positioning spring 172 fixed to the output end of the electromagnet. Because the electromagnetic hammer 17 is lightweight and compact, it typically does not require a connecting rope 3 for suspension and counterweight balance; the operator can directly hold the hammer body for operation. When precise, low-force hammering of a workpiece is required, the operator controls the push-pull electromagnet 171 to generate magnetic force to drive the output end. The positioning spring 172 at the front end of the output end acts as a buffer and adjusts the stroke during hammering, thereby achieving precise control of the hammering force, facilitating aiming and force application by the operator. The electromagnetic hammer 17 can be powered by connecting to the power interface of the multi-functional panel 15 on the support frame 1 via a power cord. The introduction of the electromagnetic hammer 17 provides a better force control solution for scenarios such as precision assembly and electronic component shaping where the impact force of the pneumatic hammer 14 is still too large, further expanding the applicability of this auxiliary system.

[0050] Because the human arm is very dexterous, the hammering force can be precisely controlled from small to large. A single pneumatic hammer or electromagnetic hammer cannot completely replace the human arm. Two hammers must be used together to replace the arm and achieve the purpose of reducing the burden on the limb.

[0051] The support frame 1 is equipped with a multi-functional panel 15, which can integrate a power interface and an air duct interface. The angle grinder can be powered by connecting to the power interface via a power cord, while the modified pneumatic hammer can obtain compressed air by connecting to the air duct interface via an air pipe. This design centralizes the energy supply to the support frame 1, effectively reducing the clutter of ground pipelines and improving the safety and tidiness of the workspace. A leakage current protector, clock, workpiece counter, etc., can also be integrated as needed.

[0052] The support frame 1 may also be provided with an air outlet 16 for connecting to an external air supply device to provide local warm or cold air to the operator.

[0053] The movable seat mechanism supports the operator's lower limbs and generates a backward thrust when using both hands. It provides stable support when the seat has a tendency to slide backward, while allowing the operator to move on the ground.

[0054] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, its specific components include: A chassis 6 serves as the bottom support for the entire seat mechanism. Multiple casters 61 are installed at the bottom of the chassis 6, allowing the seat mechanism to move freely along the ground. A lifting column 7 is mounted on the chassis 6. A seat cushion assembly 8 is located at the upper end of the lifting column 7, providing seating support for the operator. A linkage locking assembly 9 is mounted on the seat cushion assembly 8, used to control the movement and fixation of the seat mechanism.

[0055] In a preferred embodiment, the seat cushion assembly 8 includes: a highly elastic base plate 81, a seat cushion 82 disposed on the base plate 81, and a backrest 83 for supporting the back. The backrest 83 is fixedly connected to the rear of the base plate 81 by at least one L-shaped connecting plate 84. Two backrests 83 are symmetrically arranged, and a pivot 921 is fixed between the two backrests 83.

[0056] The seat 2 is an electric vehicle seat, forming a straddle-style seat mechanism. The operator's two feet are positioned on both sides of the chassis 6, which provides left and right balance support. The straddle-style movable seat reduces the load on the operator's feet and legs.

[0057] The linkage locking component 9 includes: A support leg 91 has its lower end designed to contact the ground. A highly elastic connecting vertical plate 95 is fixed to the rear end of the base plate 81. The upper end of the support leg 91 is bolted to a pressure plate 94 and tightly connected to the connecting vertical plate 95. The installation height of the support leg 91 can be finely adjusted by turning the bolts, thereby cooperating with the height-adjustable lifting column 7 to ensure that the support leg can effectively contact the ground and lock at different seat heights. A swing rod 92 has its middle part rotatably connected between the two backrests 83 via a pivot 921. The swing rod 92 has an upper trigger part 922 located above the pivot 921 and a lower linkage part 923 located below the pivot 921. A connecting ring 93 is a rectangular ring structure. One end of the connecting ring 93 is rotatably connected to the lower linkage part 923, and the other end is rotatably connected to the upper part of the support leg 91.

[0058] The working principle of the interlock is as follows: When the user sits on the seat cushion assembly 8 and leans back, their center of gravity shifts backward. First, the rear end of the base plate 81 is pressed down by the force and rotates around the connection point between the base plate 81 and the lifting column 7, thereby driving the support leg 91, which is fixedly connected to it via the connecting vertical plate 95, to move as a whole, causing the lower end of the support leg 91 to move downward and closer to the lifting column 7. At the same time, the operator's back presses against the inclined backrest 83, applying pressure to the upper trigger part 922 of the swing rod 92, forcing the swing rod 92 to rotate around the pivot 921. The rotation of the swing rod 92 is transmitted through its lower linkage part 923 and connecting ring 93, pulling the upper part of the support leg 91, causing the lower end of the support leg 91 to move away from the lifting column 7.

[0059] The two actions described above (the lower end of the support leg first moves towards the lifting column, and then is pulled away from the lifting column) work together to efficiently drive the lower end of the support leg 91 to swing rapidly backward and downward at an optimized angle until its lower end firmly contacts the ground, thus achieving a reliable mechanical lock on the entire movable seat mechanism and providing support when the operator's hands generate a backward thrust.

[0060] When the user needs to move, they lean forward. The pressure applied to the trigger 922 on the swing arm 92 disappears. At this time, under the deformation restoring force of the base plate 81 and the connecting vertical plate 95, the entire linkage mechanism is driven back to its initial position. The lower end of the support leg 91 lifts off the ground, and the lock is released. At this time, the operator can easily push the entire seat mechanism to the target position via the casters 61 by applying slight force with their feet.

[0061] like Figure 6 and Figure 10 As shown, it may also include a friction thrust baffle 13, which is disposed below the support frame 1; the friction thrust baffle 13 includes a base plate 131, two diagonal bolts 132 and two straight bolts 134, a friction rubber pad 12 is provided at the bottom of the base plate 131, and four threaded holes are provided on the base plate 131, which are distributed in pairs at both ends of the base plate 131, and rubber buffer sleeves 133 are sleeved on the surface of the two diagonal bolts 132.

[0062] The core function of the friction thrust baffle 13 is to utilize the friction of the friction rubber pad 12 to counteract the horizontal thrust, thereby reducing the gripping force of the hand holding the workpiece and thus lessening its load. In typical operations, the left hand is often used to hold the workpiece or product. When the right hand uses a tool to process the workpiece, a thrust is generated in the direction of the left hand. At this time, the operator can stably abut the workpiece against the diagonal bolt 132 of the friction thrust baffle 13. A large static friction is generated between the operating table surface and the friction rubber pad 12 at the bottom of the base plate 131, so that the positive thrust is effectively counteracted by the baffle. This means that the left hand no longer needs to rely entirely on gripping force to resist the horizontal thrust of the tool, thereby significantly reducing the muscle load on the left hand fingers and forearm.

[0063] The substrate 131 is designed with four threaded holes and a straight edge. Its multi-functionality is reflected in: As a thrust stop: the base plate 131 is laid flat, with the diagonal bolts positioned near the point where horizontal thrust is generated. One or two diagonal bolts 132 can be used. When machining small workpieces, one diagonal bolt is typically used for positioning and stopping the workpiece; when machining large workpieces, two diagonal bolts can be used to provide a wider support surface. The rubber buffer sleeve 133 fitted onto the diagonal bolt 132 protects the workpiece surface and increases friction, preventing workpiece slippage.

[0064] As a suspended worktable: When performing tasks that easily generate debris, such as grinding, the buffer sleeve 133 of the diagonal bolt 132 can be removed, and two straight bolts 134 can be installed in another set of threaded holes. Then, the base plate 131 is inverted, with the threaded ends of the straight bolts 134 acting as support legs facing downwards on the worktable. At this point, the inverted base plate 131 becomes a suspended work platform with a straight edge. The workpiece protrudes beyond the straight edge of the platform, making it convenient for the operator to place the workpiece on this platform for angle grinder grinding operations.

[0065] Working principle: In the initial state, the operator is not wearing the arm restraint mechanism 10 and is not leaning against the backrest 83 of the seat cushion assembly 8. The casters 61 at the bottom of the chassis 6 can rotate freely, and the entire seat mechanism is in a movable and unlocked state. In the upper limb load reduction mechanism, the weight of the counterweight assembly 4 has been adjusted to balance the total weight of the operating tools and connecting assembly 5.

[0066] When the operator prepares to work, they first open the interlocking buckles 104 at the front end of the arm fixing mechanism 10, put on and wrap the pair of clamping sleeves 101 with their rear ends hinged together, and then fasten the buckles 104. The clamping sleeves are then connected to the long hoop 51 fastened to the tool via the connecting arm 102, thus fixing the tool and arm together. The cushioning pad 103 on the inner side of the clamping sleeve 101 improves wearing comfort and effectively distributes the local pressure of the tool on the forearm, further reducing the load on the fingers from holding the tool for extended periods.

[0067] When the operator's hands generate a backward pushing force and the seat slides backward, the body actively leans back. First, the body weight causes the rear end of the highly elastic base plate 81 to be pressed down and to make a circular motion around the connection point between the base plate 81 and the lifting column 7. This causes the support leg 91, which is fixedly connected to the vertical plate 95, to move as a whole, so that the lower end of the support leg 91 moves downward and closer to the lifting column 7. At the same time, the operator's back presses against the inclined backrest 83, and the backrest 83 then applies pressure to the upper trigger part 922 of the swing rod 92, forcing the swing rod 92 to rotate around its pivot 921.

[0068] The rotation of the swing arm 92 is transmitted through its lower linkage 923 and connecting ring 93, pulling the upper part of the support leg 91, causing the lower end of the support leg 91 to move away from the lifting column 7. The initial displacement provided by the deformation of the base plate, combined with the active pulling force generated by the push of the backrest, produces a synthetic effect, ultimately efficiently driving the lower end of the support leg 91 to swing backward and downward at an optimized angle until its lower end firmly contacts the ground, achieving reliable mechanical locking of the entire movable seat mechanism and providing the operator with an extremely stable operating platform. The operator performs work on the locked seat platform. The counterweight balancing force of the upper limb load reduction mechanism is transmitted to the operating tool through the connecting rope 3, significantly offsetting its own weight, making the operator feel that the weight of the tool is greatly reduced, thereby effectively reducing the load on the upper limb muscles during static gripping.

[0069] Furthermore, during operations such as grinding and assembly, the operator can actively press the workpiece against the diagonal bolt 132, with additional support provided by the friction thrust plate 13. The friction rubber pad 12 at the bottom of the base plate 131 of the friction thrust plate 13 increases the friction between the workpiece and the worktable surface. The left hand no longer needs to rely entirely on grip strength to resist the horizontal thrust of the tool, thus significantly reducing the muscle load on the left hand fingers and forearm. If temporary adjustment of the counterweight or complete release of the tool for other operations is required, the locking device 11 on the support frame 1 can be used to fix the position of the connecting rope 3.

[0070] When a workstation change or movement is required, the operator naturally leans forward. The pressure applied by the connecting vertical plate 95 to the trigger 922 of the swing rod 92 disappears. At this time, under the deformation restoring force of the base plate 81 and the connecting vertical plate 95, the entire linkage mechanism (including the support leg 91, connecting ring 93, and swing rod 92) is driven back to its initial position. The lower end of the support leg 91 lifts off the ground, and the lock is released. At this time, the operator sits on the seat in a straddle posture, with both feet naturally placed on both sides of the chassis 6. This posture allows the operator to naturally grip the seat with both legs, greatly enhancing the seat's stability in the lateral direction. At the same time, when it is necessary to move to the side or rotate slightly to adjust the orientation, the operator can easily and accurately control the seat to move or rotate to the target position via the casters 61 by alternating force with both feet or twisting the body, making operation very convenient. This design takes into account both the flexibility of movement and the stability of the sitting posture, adapting to the unique need of "sitting and moving" in assembly line operations.

[0071] By controlling the user's posture, the mechanical locking and unlocking of the movable seat mechanism is directly and in conjunction with the user's posture; at the same time, the upper limb load-reducing mechanism continuously counteracts the weight of the operating tool. This design allows the operator to seamlessly and quickly switch between a "stable locked working state" and a "flexibly movable support state" within the workstation, according to the needs of the job.

Claims

1. An assistive system for reducing limb load, characterized in that: Includes an upper limb load-bearing mechanism and a movable seat mechanism; The upper limb load reduction mechanism includes a support frame (1), on which at least one set of fixed pulleys is provided. Each set of fixed pulleys includes at least two fixed pulleys (2) and a connecting rope (3) wound around it. The first end of the connecting rope (3) is connected to a counterweight assembly (4), and the second end of the connecting rope (3) is used to connect to an operating tool via a connecting assembly (5). The weight of the counterweight assembly (4) is configured to balance the weight of the operating tool and the connecting assembly (5) to counteract the weight of the operating tool itself. The movable seat mechanism includes a chassis (6), a lifting column (7) mounted on the chassis (6), a seat cushion assembly (8) mounted on the upper end of the lifting column (7), and a linkage locking assembly (9) mounted on the seat cushion assembly (8). The chassis (6) is provided with multiple casters (61) at the bottom. The linkage locking component (9) is configured to: trigger a locking action to fix the movable seat mechanism in response to the user sitting on the seat cushion component (8) and release the lock to allow the movable seat mechanism to move in response to the user sitting on the seat cushion component (8) and leaning forward.

2. The assistive system for reducing limb load according to claim 1, characterized in that: The seat cushion assembly (8) includes a base plate (81), a seat cushion (82) disposed on the base plate (81), and a backrest (83). The back plate (83) is fixedly connected to the rear of the base plate (81) by at least one L-shaped connecting plate (84); there are two back plates (83) symmetrically arranged, and a pivot (921) is provided between the back plates (83). The linkage locking component (9) includes: Support leg (91), the lower end of which is used to abut against the ground; The L-shaped connecting vertical plate (95) is fixed to the rear end of the base plate (81), and the upper end of the support leg (91) is tightly connected to the connecting vertical plate (95) by bolts and pressure plate (94). A swing arm (92) is rotatably connected to the pivot (921) in its middle part. The swing arm (92) has an upper trigger part (922) located above the pivot (921) and a lower linkage part (923) located below the pivot (921). The connecting ring (93) is a rectangular ring structure; one end of the connecting ring (93) is rotatably connected to the lower linkage part (923), and the other end is rotatably connected to the upper part of the support leg (91); Both the base plate (81) and the connecting vertical plate (95) are elastic; When a user sits on the seat cushion assembly (8) and leans back, the rear end of the base plate (81) is pressed down and rotates around the connection point between the base plate (81) and the lifting column (7), thereby causing the lower end of the support leg (91) to move downward and closer to the lifting column (7); at the same time, the user's back applies pressure to the upper trigger part (922) of the swing rod (92), forcing the swing rod (92) to rotate around the pivot (921); the rotation of the swing rod (92) is transmitted through its lower linkage part (923) and the connecting ring (93), pulling the support leg (91), causing the lower end of the support leg (91) to move away from the lifting column (7); the two actions work together until the lower end of the support leg (91) is firmly in contact with the ground, thereby achieving mechanical locking of the entire movable seat mechanism; When the user leans forward, the support leg (91) is lifted by the deformation restoring force of the base plate (81) and the connecting vertical plate (95), and the swing rod (92) is reset and unlocked.

3. An assistive system for reducing limb load according to claim 1, characterized in that: The connecting assembly (5) includes at least two long hoops (51) for clamping onto the operating tool, the long hoops (51) being locked by fasteners (52); The long hoop (51) located at the front end is provided with a connecting ring (53) for connecting the second end of the connecting rope (3).

4. An assistive system for reducing limb load according to claim 3, characterized in that: It also includes an arm fixing mechanism (10), which includes at least one pair of clamping sleeves (101), the rear ends of which are hinged to each other, and the front ends of which are provided with interlocking buckles (104) to achieve opening and closing; the arm fixing mechanism (10) is connected to the long hoop (51) or the fastener (52) located at the rear end via a connecting arm (102) for binding and fixing the operating tool to the user's arm.

5. An assistive system for reducing limb load according to claim 4, characterized in that: A buffer pad (103) is provided on the inner side of the clamping sleeve (101).

6. An assistive system for reducing limb load according to claim 1, characterized in that: The upper limb load reduction mechanism also includes a locking device (11), which is mounted on the support frame (1) and acts on the connecting rope (3) to fix the position of the connecting rope (3).

7. An assistive system for reducing limb load according to claim 1, characterized in that: It also includes a friction thrust baffle (13), which is located below the support frame (1); the friction thrust baffle (13) includes a base plate (131), two diagonal bolts (132) and two straight bolts (134), a rubber pad is provided at the bottom of the base plate (131), and four threaded holes are provided on the base plate (131), which are distributed in pairs at both ends of the base plate (131), and rubber buffer sleeves (133) are fitted on the surfaces (132) of the two diagonal bolts.

8. An assistive system for reducing limb load according to claim 1, characterized in that: The support frame (1) is provided with a multi-functional panel (15).

9. An assistive system for reducing limb load according to claim 1, characterized in that: An air outlet (16) is provided on the support frame (1).

Images