CN109044748B

CN109044748B - Walking vehicle for assisting patient/old man to walk outdoors

Info

Publication number: CN109044748B
Application number: CN201810910242.2A
Authority: CN
Inventors: 王刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2024-04-26
Anticipated expiration: 2038-08-10
Also published as: CN109044748A

Abstract

The invention relates to a walking vehicle for assisting a patient/old person to walk outdoors, which belongs to the field of auxiliary walking equipment and mainly solves the problem that the old person or the patient with poor balance but powerful legs and feet do not have proper auxiliary walking equipment. The walker is more suitable for old people or patients with poor balance but powerful legs and feet.

Description

Walking vehicle for assisting patient/old man to walk outdoors

Technical Field

The invention relates to the field of auxiliary walking equipment, in particular to a walking vehicle for assisting a patient/the old to walk outdoors.

Background

When the elderly or patients have inconvenient walking due to physical reasons, the walking is generally performed by aid of auxiliary tools. At present, the wheelchair and the walking stick are auxiliary walking tools commonly used by the old or patients, the auxiliary walking tools can be used selectively according to the conditions of the old or patients, the wheelchair is generally used for supporting the body in the condition that the legs and the feet are weak and can not stand, and the walking stick needs to have certain supporting force for the body coordination of the user.

The aged and elderly people with encephalopathy and cerebellum have the balance function of being blocked to cause unstable standing, the walking stick is difficult to sufficiently support a patient because of forward inclination of self-protection consciousness, and the walking stick cannot be used under the condition, especially the weight of the body cannot be supported under the condition that the weight of the patient is large or the leg strength is weak. Under the condition that people often choose to use the wheelchair to push or hand by oneself to drive the wheelchair, but the problem is that people sit on the wheelchair for a long time and cannot exercise for a long time to easily cause muscular atrophy and other health problems, and patients/old people are difficult to control and fall down once trying to stand up to hold the wheelchair for walking, because the wheelchair rollers are large and the whole weight of the wheelchair is lighter (the wheelchair is designed for people who cannot walk on standing, the design of the diameter of the wheels is also good, the wheelchair material and the whole weight are both good, and the design is light), and the old people with poor leg and foot body balance and the patient are difficult to control.

At present, no device capable of assisting the legs and feet and also having certain strength to walk by the patient/the old with poor body balance exists in the prior art, and development of a substitute tool between a wheelchair and a crutch is a problem to be solved in the prior art.

Disclosure of Invention

The purpose of the invention is that: provided is a walking vehicle for assisting an old person or a patient to walk outdoors, which can assist the old person or the patient who cannot walk in balance and has a certain strength in their legs. The auxiliary walking device is arranged between the wheelchair and the crutch, not only can enable a patient and the old to walk by pushing the cart by himself, but also can be conveniently assisted by a person to walk by pushing the cart by himself by means of friction force between feet and the ground, and can enable the patient/the old to walk by driving the cart by himself by means of the friction force between feet and the ground.

In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides an auxiliary patient/old man's outdoor walking car, includes frame, seat portion, roller train, and wherein roller train sets up in the frame below, and the frame is whole to be approximately long U-shaped structure encloses into the open space of approximately long U-shaped, and seat portion sets up in the long U-shaped open space of frame and is close to the arc section of frame, and patient/old man can stand hand frame open side with the health support on the frame towards arc section shallow walking, also can sit on seat portion back towards arc section and face open side bicycle pedal ground drive car walking.

Preferably, the frame comprises an upper support frame with an approximate long U shape and a lower support frame with an approximate long U shape.

Preferably, the upper support frame and the lower support frame are respectively composed of an elliptic arc section, a first straight section and a second straight section which are positioned on two sides of the elliptic arc section, and form an approximately long U-shaped axisymmetric opening structure, and on the overlook projection, the symmetry axis of the lower support frame is coincident with the symmetry axis of the upper support frame and the direction of the opening end is consistent, so that the stability of the walking vehicle is maintained.

Preferably, a plurality of support rods connected between the upper support frame and the lower support frame are further arranged between the upper support frame and the lower support frame.

Preferably, the height between the upper and lower support frames is in the range of 50 cm to 70 cm.

Preferably, the shapes of the upper support frame and the lower support frame are approximate, the size of the upper support frame is smaller than that of the lower support frame, and the top view projection of the upper support frame is positioned in the top view projection of the lower support frame; the structure with small upper part and large lower part makes the walking vehicle more stable, and the walking vehicle is not easy to turn over when in use.

Preferably, the distance between the top view projection contour line of the arc-shaped section of the upper support frame and the top view projection contour line of the arc-shaped section of the lower support frame is dn, and the contour line distance between the top view projection of the first straight section of the upper support frame and the top view projection of the first straight section of the lower support frame and the contour line distance between the top view projection of the second straight section of the upper support frame and the top view projection of the second straight section of the lower support frame is dm, wherein dn is greater than or equal to dm.

Preferably, dm is approximately equal to the diameter D2 of the lower support frame, and dn is 1 to 1.3 times D2.

Preferably, the lengths of the first straight section and the second straight section of the upper support frame and the lower support frame are equal, the radian of the arc section is within the range of 124-180 degrees, and the ratio of the chord distance of the arc section of the lower support frame to the lengths of the first straight section and the second straight section is 5: 7-6: 5, the ratio of the chord distance of the arc-shaped section of the upper support frame to the length of the first straight section and the second straight section is 4: 7-1: 1, a step of; the ratio of the chord length of the arc line of the lower support frame to the width of the opening of the first two-way section to the height distance between the upper support frame and the lower support frame is about 5:6: 7-1: 1:1, the ratio of the chord length of the arc line section of the upper supporting frame to the width of the opening of the first two straight sections and the height distance between the upper supporting frame and the lower supporting frame is about 4:6: 7-1: 1:1.

Preferably, the length of the first straight section and the second straight section of the upper support frame is between 50 cm and 70 cm; the width of the opening end of the upper support frame is 45 cm-50 cm, the lengths of the first straight section and the second straight section of the lower support frame are 50 cm-70 cm, and the width of the opening end of the lower support frame is 55 cm-60 cm; the width from the top point to the end point of the arc-shaped section of the lower support frame is 20-30 cm, and the width from the top point to the end point of the arc-shaped section of the upper support frame is 15-25 cm.

Preferably, the weight of the lower support frame is larger than that of the upper support frame, so that the gravity center of the walker is reduced, and the stability of the walker is further improved.

Preferably, the upper and lower support frames are tubular structures.

Preferably, the weight is arranged in the lower support frame and is adjustable, and the weight is adjusted according to the weight of a user, so that the weight and the stability of the walking vehicle are further optimized.

Preferably, the seat part is arranged on the supporting rod in a foldable and liftable manner, and users with different heights can use the seat conveniently by adjusting the height of the seat.

Preferably, the seat part is fixed through the seat cross beam, two ends of the seat cross beam are respectively fixed on two opposite supporting rods, and a user can adjust the height of the seat cross beam according to the height condition to enable the seat part to be in a proper position.

Preferably, the support rod is detachably connected with the upper support frame, the support rod is detachably connected with the lower support frame, and the detachable structure is more convenient for transportation of the vehicle.

Preferably, the number of the support rods is 4, wherein two ends of the two support rods are respectively fixed on the end surfaces of the opening ends of the upper support frame and the lower support frame; two ends of the other two support rods are arranged at the junction of the arc line section and the straight line section close to the upper support frame and the lower support frame.

Preferably, the roller group is provided with 4 rollers and is arranged on the same plane, wherein the first roller and the second roller are symmetrically arranged at the front lower parts of the two sides of the opening end of the lower support frame; the third roller and the fourth roller are symmetrically arranged at the rear lower part of the arc section of the lower support frame.

Preferably, a cross beam is arranged at the arc section of the lower support frame, and the third roller and the fourth roller are symmetrically arranged below the cross beam; further preferably, the outer edges of the first roller and the second roller are flush with the open side end face of the lower support frame, and the outer edges of the third roller and the fourth roller are flush with the outer edge of the arc-shaped section of the lower support frame. Theoretically, the stability of the walker is higher as the rollers get closer to the outer edges of the device, but if the wheels are raised, they can easily collide with the user or another person, so it is preferable to arrange the rollers as far as possible at the edges of the device without being raised.

Preferably, the rollers of the roller group are universal wheels with brake devices. The walker can be fixed in case of need, preventing the movement of the device.

Preferably, the two sides of the opening end of the lower support frame are respectively provided with a pedal, the pedals are horizontally placed towards the inner side of the opening end when in use, and the pedals are vertically placed after being folded when not in use.

Preferably, the opening end part of the upper support frame is provided with a handrail part made of soft materials, so that a user can feel more comfortable.

Preferably, the seat portion is provided with a seat belt.

Preferably, the backrest is arranged on the seat part and perpendicular to the seat part, and the backrest is fixed on the seat part or the support frame, so that the backrest can be more comfortable for a user to rest or use.

Preferably, a storage basket is arranged above the inner side of the lower support frame and is positioned below the seat part.

Preferably, the inner side of the upper support is provided with a foldable shielding part which is made of a soft material for shielding light and rain, and the shielding part is fixed on the upper support frame through a plurality of umbrella ribs. The user can conveniently deal with different weather conditions.

Compared with the prior art, the invention has the advantages that: the utility model provides an auxiliary patient/old man's outdoor walking car, includes frame, seat portion, roller train, and wherein roller train sets up in the frame below, and the frame is whole to be approximately long U-shaped structure encloses into the open space of approximately long U-shaped, and seat portion sets up in the long U-shaped open space of frame and is close to the arc section of frame, and patient/old man can stand hand frame open side with the health support on the frame towards arc section shallow walking, also can sit on seat portion back towards arc section and face open side bicycle pedal ground drive car walking. The auxiliary walking equipment is more suitable than a wheelchair for patients or old people with poor body balance capability and powerful feet.

Drawings

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

FIG. 2 is a top perspective view of the upper and lower support brackets of the present invention;

FIG. 3 is a schematic view of the structure of the lower support frame of the present invention;

FIG. 4 is a schematic view of a frame assembly according to the present invention;

fig. 5 is a schematic structural diagram of the roller set according to the present invention.

In the figure, the frame 1, the upper supporting frame 11, the arc-shaped section 111, the first straight section 112, the second straight section 113, the lower supporting frame 12, the arc-shaped section 121, the first straight section 122, the second straight section 123, the cross beam 123, the supporting rod 13, the supporting rod 14, the armrest part 2, the seat part 21, the backrest 31, the first roller 31, the second roller 32, the third roller 33, the fourth roller 34, the cross beam 4, the foot rest 5, the storage basket 6, the shielding part 7 and the umbrella frame 8.

D2-the pipe diameter of the lower supporting frame;

dn-the distance between the arc section contour line of the upper support frame and the arc section projection contour line of the lower support frame in the overlooking projection;

dm—in top view, the first straight section (second straight section) contour of the upper support frame is distant from the first straight section (second straight section) contour of the lower support frame.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

As shown in figure 1, the walking vehicle for assisting the patient/the old to walk outdoors comprises a vehicle frame 1, a seat part 2 and a roller group, wherein the roller group is arranged below the vehicle frame 1, the whole approximately long U-shaped structure of the vehicle frame 1 encloses an approximately long U-shaped opening space, the seat part 2 is arranged in the approximately long U-shaped opening space of the vehicle frame 1 and is close to an arc section of the vehicle frame 1, the patient/the old can stand up to support the body on the vehicle frame 1 by walking on the opening side of the vehicle frame 1 and walk towards the arc section trolley, and can also sit on the seat part 2 and walk back towards the arc section and face the opening side by using pedals for the bicycle.

Preferably, the shape of the upper support frame and the lower support frame 11, 12 is similar, the size of the upper support frame 11 is smaller than that of the lower support frame 12, and the top view projection of the upper support frame 11 is located in the top view projection of the lower support frame 12, so that the whole frame forms a stable structure with a lower center of gravity and a larger lower upper center. The walking vehicle is more stable, and the vehicle is not easy to turn over when in use.

Preferably, the frame 1 comprises two generally parallel arranged approximately long U-shaped upper support brackets 11, an approximately long U-shaped lower support bracket 12 and a plurality of support rods 13 connected between the upper and lower support brackets.

Preferably, the upper and lower supporting frames 11, 12 are respectively composed of elliptical arc-shaped sections 111, 121, first straight sections 112, 122 and second straight sections 113, 123 positioned at two sides of the elliptical arc-shaped sections 111, 121, which form an approximately long U-shaped axisymmetric opening structure, and the symmetry axis of the lower supporting frame 12 coincides with the symmetry axis A of the upper supporting frame 11 in a top view projection and the direction of the opening end is consistent. The symmetrical structure enables the center of the walking vehicle to be positioned on the symmetrical axis, so that the stability of the walking vehicle can be improved, and the situation that a user turns over when standing to use the walking vehicle is prevented.

Preferably, the height between the upper and lower supporting frames 11, 12 is in the range of 50 cm-70 cm, so that the user can conveniently use the walking vehicle with both hands.

Preferably, the weight of the lower support frame 12 is greater than that of the upper support frame 11, so that the gravity center of the walker can be lowered, and the stability of the walker can be further improved.

Preferably, the upper and lower support frames 11, 12 are tubular in configuration.

Preferably, the lower support frame 12 is internally provided with a counterweight and is adjustable; the counterweight can be disposed in a variety of ways, such as by placing the counterweight in a hollow tubular structure of the lower support frame 12, or by removably sleeving the counterweight on the lower support frame 12. The weight is adjusted according to the weight of the user, so that the weight and the stability of the walking vehicle are optimized. The materials of the upper support frame 11, the lower support frame 12 and the support rods 13 are preferably six-minute galvanized welded steel pipe materials, so that the durability of the frame is improved.

Experiments show that the following parameter refinement can greatly improve the safety and stability of the walking vehicle in different use states of the vehicle:

Preferably, as shown in fig. 2 and 3, in the plan view projection, a distance between a plan view projection contour line of the arc-shaped section 111 of the upper support frame 11 and a plan view projection contour line of the arc-shaped section 121 of the lower support frame 12 is dn, a contour line distance between a plan view projection of the first straight section 112 of the upper support frame 11 and a plan view projection of the first straight section 122 of the lower support frame 12 is dm, and a contour line distance between a plan view projection of the second straight section 113 of the upper support frame 11 and a plan view projection of the second straight section 123 of the lower support frame 12 is dm, where dn is greater than or equal to dm. Further preferably, dm is approximately equal to the pipe diameter D2 of the lower support frame 12, with dn being 1 to 1.3 times D2.

Further preferably, the lengths of the first straight sections 112, 122 and the second straight sections 113, 123 of the upper and lower supporting frames 11, 12 are equal, the radian of the arc sections 111, 121 is in the range of 124 degrees to 180 degrees, and the ratio of the chord distance of the arc section 121 of the lower supporting frame 12 to the lengths of the first and second straight sections is 5: 7-6: 5, the ratio of the chord distance of the arc-shaped section 111 of the upper supporting frame 11 to the lengths of the first straight section and the second straight section is 4: 7-1: 1, a step of; the ratio of the chord length of the arc line 121 of the lower support frame 12 to the opening width of the first two straight sections 122, 123 to the height distance between the upper and lower support frames is about 5:6: 7-1: 1:1, the ratio of the chord length of the arc line 111 of the upper supporting frame 11 to the opening width of the first two straight sections 112 and 113 to the height distance between the upper supporting frame and the lower supporting frame is about 4:6: 7-1: 1:1.

Further preferably, the first straight sections 112, 122 are equal in length to the second straight sections 113, 123, and have a length between 50 cm and 70 cm; the width of the opening end of the upper supporting frame 11 is 45-50 cm, and the width of the opening end of the lower supporting frame 11 is 55-60 cm; the width from the top to the end of the arc-shaped section of the lower support frame 12 is 20-30 cm, and the width from the top to the end of the arc-shaped section of the upper support frame 11 is 15-25 cm.

Preferably, the seat part 2 is arranged on the supporting rod 13 in a foldable and liftable manner, and users with different heights can conveniently use the seat by adjusting the height of the seat.

Lifting and folding can be realized in various modes, in the lifting mode, the seat part 2 is fixed through the seat cross beam 4, two ends of the seat cross beam 4 are respectively fixed on two opposite support rods 13, a plurality of through holes in the vertical direction are formed in the corresponding support rods 13, the seat cross beam 4 is fixed through the through holes by using screws, different through hole fixing cross beams are selected, and a user can adjust the height of the seat cross beam according to the height condition to enable the seat part to be at a proper position; or the two ends of the seat cross beam 4 are respectively fixedly connected with a clamp, the clamp is sleeved on the corresponding supporting rod 13, and the seat is adjusted to a proper height by releasing and screwing the clamp; the two ends of the seat cross beam 4 are respectively fixed with circular rings, the seat cross beam 4 is sleeved on the supporting rod 13 by the circular rings, the circular rings are locked on the supporting rod 13 by the bolts, and the adjustment of the height of the seat is realized by releasing and screwing the bolts; the lifting cylinder can also be utilized to realize seat height adjustment and the like. In the folding mode, the seat part 2 fixed on the seat cross beam 4 is driven to be folded upwards by the rotation of the seat cross beam 4, the seat part 2 is in a vertical state, the folding of the seat part 2 is realized, and the seat cross beam 4 is preferably made of a reinforced material with the diameter of 14 mm.

Preferably, as shown in fig. 4, the supporting rods 13 are detachably connected with the upper supporting frame 11, the supporting rods 13 are detachably connected with the lower supporting frame 11, in a preferred embodiment, a connecting structure 15 is arranged at the connecting position, the supporting rods 13 are sleeved outside the connecting structure 15 or inserted into the connecting structure 15, the supporting rods 13 and the upper and lower supporting frames 11 and 12 are fixed on the connecting structure by using screws, the number of the supporting rods 13 is preferably 4, the connecting positions are shown in fig. 4, and two ends of the two supporting rods are respectively fixed on the end surfaces of the opening ends of the upper and lower supporting frames; the connecting structure 15 of the joint of the arc section and the straight line section of the upper and lower support frames, which is arranged at the two ends of the other two support rods, is preferably made of reinforced steel materials with the diameter of 20 mm. Realize the dismantlement function of frame. The detachable structure is more convenient for transportation of the walking vehicle.

Preferably, the roller group is provided with 4 rollers and is arranged on the same plane, wherein the first roller 31 and the second roller 32 are symmetrically arranged at the front lower parts of the two sides of the opening end of the lower support frame 12; the third roller 33 and the fourth roller 34 are symmetrically arranged at the rear lower part of the arc-shaped section of the lower support frame 12.

Preferably, a cross beam 124 is arranged at the arc-shaped section 121 of the lower support frame 12 as shown in fig. 1 and 5, and the third roller 33 and the fourth roller 34 are symmetrically arranged below the cross beam 124; it is further preferred that the outer edges of the first roller 31 and the second roller 32 are flush with the open side end face of the lower support frame 12, and the outer edges of the third roller 33 and the fourth roller 34 are flush with the outer edge of the arcuate section 121 of the lower support frame 12. Theoretically, the stability of the walker is higher as the roller approaches the outer edge of the device, but if the roller protrudes to easily collide with a user or another person, it is preferable that the roller is disposed at the edge of the device as much as possible without protruding. The material of the cross beam 124 is preferably hexazincified welded steel pipe.

Preferably, the two sides of the opening end of the lower support frame 12 are respectively provided with a pedal 5, when in use, the pedal 5 is horizontally placed towards the inner side of the opening end, and when not in use, the pedal 5 is folded and then vertically placed; the pedal 5 can be folded by connecting the pedal 5 with the lower support frame 12 by a hinge.

Preferably, the open end of the upper support frame 11 is provided with a handrail portion 14 made of soft material, which gives a more comfortable experience to the user.

Preferably, a seat belt (not shown) is provided on the seat part 2.

Preferably, the backrest 21 is arranged on the seat part 2, the backrest 21 is arranged perpendicular to the seat part 2, the backrest 21 is fixed on the seat part 2 or on the frame 1, and the backrest 21 can enable a user to rest or use the seat more comfortably.

Preferably, the storage basket 6 is disposed above the inner side of the lower support frame 12, and the storage basket 6 is located below the seat portion 2.

Preferably, the inner side of the upper supporting frame 11 is provided with a foldable shielding part 7, the shielding part 7 is made of a soft material for shielding light and rain, the shielding part 7 is fixed on the upper frame 1 through a plurality of umbrella ribs 8, and the umbrella ribs 8 are preferably made of steel bars with the diameter of 6 mm.

Compared with the prior art, the structure of the invention has the main advantages that:

1) A walking aid for the old and the patient is provided, which is especially suitable for the old and the patient who cannot walk, stand up and walk without being forced, because the cerebellum cannot balance himself and the legs and feet are powerful. The walking vehicle is arranged between the wheelchair and the crutch, so that a patient and the old can walk by pushing the vehicle by himself, other people can conveniently help the patient/the old to walk by pushing the vehicle by himself, the patient/the old can sit on the walking vehicle and walk by pushing the vehicle by means of the friction force between feet and the ground, the vehicle is multipurpose, movable and static, the outdoor walking of the patient/the old is greatly facilitated, no matter what state is adopted, the patient/the old does not lie down forward and fall backward when using the vehicle, the arms can be balanced, the physical health of the patient/the old is greatly promoted, and the dependence on the cart cared by other people is reduced.

2) The integral U-shaped opening structure not only ensures that the integral frame is more stable in operation, but also ensures that patients/old people can conveniently switch to various use states by themselves, and is especially suitable for outdoor walking of the patients/old people.

3) The optimal design of parameters such as big upper part, small lower part, light upper part, heavy upper part, overall structure proportion and the like of the frame further improves the stability and safety of the walker under various use conditions for various patients/old people.

4) The detachable design of the frame of the application can greatly facilitate travel carrying.

5) The height of the frame is adjustable, and the weight is designed, so that the adaptability of the vehicle to people with different heights and weights is greatly improved.

While this structure is simple, it implies many innovative designs. The inventor of the application makes the patients after the operation of the brain tumor, the patients suffering from cerebral apoplexy, the cerebral palsy and the aged people above 80 years suitable for the product model respectively, and has very good effects. The application has great social benefit for 13 hundred million people and increasingly-aged present China.

Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims

1. A walker for assisting a patient/elderly person to walk outdoors, characterized in that: comprises a frame, a seat part and a roller group; the roller set is arranged below the frame, and the whole frame is approximately of a long U-shaped structure and encloses an approximately long U-shaped opening space; the seat part is arranged in the long U-shaped opening space of the frame and is close to the arc-shaped section of the frame;

The patient/old can stand up to walk towards the open side of the frame and support the body above the frame towards the cart of the arc section, or can sit on the seat part to drive the walking cart to walk with the foot pedal by a bicycle facing away from the arc section towards the open side of the frame;

The frame comprises an approximately long U-shaped upper support frame, an approximately long U-shaped lower support frame and a plurality of support rods, wherein the support rods are detachably connected between the upper support frame and the lower support frame;

The outer contour dimension of the upper support frame is smaller than that of the lower support frame, and the top view projection of the upper support frame is positioned in the top view projection of the lower support frame; on the projection of a top view, the symmetry axis of the upper support frame is coincident with the symmetry axis of the lower support frame, and the directions of the opening end are consistent; the weight of the upper supporting frame is smaller than that of the lower supporting frame;

the distance between the upper support frame and the lower support frame is adjustable.

2. The walker as claimed in claim 1 wherein: the upper support frame and the lower support frame are composed of an elliptic arc section, a first straight section and a second straight section which are positioned on two sides of the elliptic arc section, and an approximately-long U-shaped axisymmetric opening structure is formed by the upper support frame and the lower support frame.

3. The walker as claimed in claim 2 wherein: the height between the upper support frame and the lower support frame is in the range of 50 cm-70 cm.

4. A walker as claimed in claim 3 wherein: the distance between the top view projection contour line of the arc-shaped section of the upper support frame and the top view projection contour line of the arc-shaped section of the lower support frame is dn, the distance between the top view projection contour line of the first straight section of the upper support frame and the top view projection contour line of the first straight section of the lower support frame and the distance between the top view projection contour line of the second straight section of the upper support frame and the top view projection contour line of the second straight section of the lower support frame are dm, and dn is greater than or equal to dm.

5. The walker of claim 4 wherein: the pipe diameter of the lower supporting frame is D2; said dm is equal to said D2, said dn=k×d2; wherein k is more than or equal to 1 and less than or equal to 1.3.

6. The walker of claim 4 wherein: the lengths of the first straight section and the second straight section of the upper support frame are equal, and the lengths of the first straight section and the second straight section of the lower support frame are equal; the radian range of the arc sections of the upper support frame and the lower support frame is 124-180 degrees; the length ratio range of the chord distance of the arc-shaped section of the upper support frame to the first straight section is 4:7~1:1, the length ratio range of the chord distance of the arc section of the lower support frame to the first straight section is 5:7~6:5, a step of; the arc chord length, the opening end width and the height distance ratio range between the upper support frame and the lower support frame of the upper support frame are 4:6:7~1:1:1, the arc chord length, the opening end width and the height distance ratio range between the upper support frame and the lower support frame of the lower support frame are 5:6:7~1:1:1.

7. The walker of claim 6 wherein: the lengths of the first straight section and the second straight section of the upper support frame are 50 cm-70 cm, the width of the opening end of the upper support frame is 45 cm-50 cm, and the width from the top point to the end point of the arc-shaped section of the upper support frame is 15 cm-25 cm;

The length of the first straight section and the second straight section of the lower support frame is 50 cm-70 cm, the width of the opening end of the lower support frame is 55 cm-60 cm, and the width from the top point to the end point of the arc-shaped section of the lower support frame is 20 cm-30 cm.

8. The walker as claimed in claim 7 wherein: the upper support frame and the lower support frame are of tubular structures.

9. The walker as claimed in claim 1 wherein: the seat part is arranged on the supporting rod in a foldable and liftable manner.

10. The walker as claimed in claim 9 wherein: the seat part is fixed through the seat crossbeam, and the both ends of seat crossbeam are fixed respectively on two opposite bracing pieces, and the user can be in suitable position according to the height condition height-adjusting seat crossbeam messenger seat part.

11. The walker as claimed in claim 1 wherein: the number of the supporting rods is 4.

12. The walker as claimed in claim 2 wherein: the roller set is provided with 4 rollers and is arranged on the same plane; the first roller and the second roller are symmetrically arranged below the front of the two sides of the opening end of the lower support frame; the third roller and the fourth roller are symmetrically arranged at the rear lower part of the arc-shaped section of the lower supporting frame.

13. The walker as claimed in claim 12 wherein: the arc section department of lower carriage is provided with a crossbeam, and third gyro wheel and fourth gyro wheel symmetry set up in the below of crossbeam and be close to the both ends of crossbeam.

14. The walker of claim 13 wherein: the outer edges of the first roller and the second roller are flush with the end face of the opening side of the lower support frame, and the outer edges of the third roller and the fourth roller are flush with the outer edge of the arc-shaped section of the lower support frame.

15. The walker of any one of claims 1, 12, 13 and 14 wherein: the rollers of the roller group are all universal wheels with braking devices.

16. The walker as claimed in claim 2 wherein: the pedal plates are respectively arranged on two sides of the opening end of the lower support frame, and are horizontally placed towards the inner side of the opening end when in use and vertically placed after being folded when not in use.

17. A walker for assisting a patient/elderly person to walk outdoors, characterized in that: comprises a frame, a seat part and a roller group; the whole frame is approximately long-U-shaped and encloses an approximately long-U-shaped opening space, the seat part is arranged in the long-U-shaped opening space of the frame and is close to an arc section of the frame, and the roller group is provided with 4 rollers; the first roller and the second roller are symmetrically arranged at the front lower parts of two sides of the opening end of the lower support frame, and the third roller and the fourth roller are symmetrically arranged at the rear lower part of the lower support frame; the specific arrangement positions of the four rollers are that the front and the back of the lower support frame are just not extended and the outer edges of the lower support frame are not extended to the two sides of the lower support frame;

The outer contour dimension of the upper support frame is smaller than that of the lower support frame, and the top view projection of the upper support frame is positioned in the top view projection of the lower support frame; on the projection of a top view, the symmetry axis of the upper support frame is coincident with the symmetry axis of the lower support frame, and the directions of the opening end are consistent; the weight of the upper support frame is smaller than that of the lower support frame, so that the whole frame forms a stable structure with lower center of gravity and larger lower part;