Foldable wheelchair and folding lock assembly thereof

Abstract

The utility model belongs to the technical field of mobile walking aid equipment, and provides a folding lock assembly which comprises a first connecting piece and a second connecting piece, and an elastic pin is arranged on the first connecting piece; the second connecting piece is connected with the first connecting piece through a rotating shaft, a pre-locking position of the second connecting piece is provided with a fixing part for insertion of the elastic pin, and the pre-locking position at least comprises rotation limit positions of the second connecting piece and the first connecting piece; a first protrusion and a second protrusion are arranged at the positions, corresponding to the pre-locking position, of the second connecting piece, and a guide mechanism is arranged between the first protrusion and the second protrusion. The guide mechanism comprises a guide cone on the first bulge and a guide convex part on the second bulge, and the guide cone and the guide convex part extend oppositely; the guide mechanism is used for guiding the elastic pin to the fixing part so as to lock the relative rotation angle of the second connecting piece and the first connecting piece. The utility model further provides a foldable wheelchair with the folding lock assembly. The problem that an existing up-down folding type wheelchair cannot be locked in a folding state is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of mobile walking aids, and in particular, relates to a foldable wheelchair and a folding lock assembly thereof. Background Art

[0002] Common wheelchairs are designed for disabled people or the elderly. Because lower limb disabilities or aging may cause inconvenience in legs and feet, which is not conducive to daily walking, wheelchairs have become a mobile aid for such people in their daily lives.

[0003] The foldable wheelchairs currently on the market can be divided into two types according to the folding and storage method of the wheelchair: including left-right folding type and up-down folding type. Among them, due to the inherent limitation of the folding method of the left-right folding type wheelchair, the seat and backrest of the wheelchair can only use soft materials, and the seat cannot be provided with too much filler, resulting in poor riding comfort. Up-down folding wheelchairs do not have this disadvantage, but the up-down folding wheelchairs of the prior art can only be locked in the unfolded state, and cannot be effectively locked in the folded state of the wheelchair, which causes inconvenience to the user when carrying the folded wheelchair. Because the folded wheelchair may be unfolded at any time during the process of carrying the wheelchair, there are great inconveniences and risks. Especially for electric wheelchairs, the power wheels are mostly located at the rear wheels, which are heavier and more likely to unfold the folded wheelchair, which is more risky. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a foldable wheelchair and a folding lock assembly thereof, so as to solve the technical problem that the up-and-down folding wheelchair in the prior art cannot be locked in the folded state.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is to provide a folding lock assembly, comprising:

[0006] A first connecting member, provided with an elastic pin;

[0007] A second connecting member is connected to the first connecting member via a rotating shaft, a fixing portion for the elastic pin to be inserted into the pre-locking position of the second connecting member is provided, and the pre-locking position at least includes a rotation limit position of the second connecting member and the first connecting member;

[0008] Wherein, the second connecting member is provided with a first protrusion and a second protrusion for setting the fixing part at a position corresponding to the pre-locking position, and a guide mechanism is provided between the first protrusion and the second protrusion; the guide mechanism comprises a guide cone provided on the first protrusion and a guide convex part provided on the second protrusion, and the guide cone and the guide convex part are extended toward each other;

[0009] The guiding mechanism is used to guide the elastic pin to the fixing portion, so as to lock the relative rotation angle between the second connecting member and the first connecting member.

[0010] In this way, when the elastic pin is plugged into the fixed part in the pre-locking position, the wheelchair can be locked in the folded or unfolded state, ensuring the stability of the wheelchair in the folded or unfolded state. The guide mechanism can guide the elastic pin to the fixed part to complete automatic locking during the state change of the wheelchair, so that the human hand does not need to operate the elastic pin throughout the whole process, effectively simplifying the operation steps and improving the convenience of use.

[0011] In one embodiment, the pre-locking position at least includes the first protrusion abutting against the first connecting member, or the rotation limit position formed by the associated member connected to the first connecting member. That is, when the first protrusion abuts against the first connecting member or the structure connected to the first connecting member, the elastic pin will not be affected by the supporting force or the gravity of the component in this state and will not be deformed under external force. The folding lock assembly of the present application not only plays a locking role, but also plays a supporting role in the actual movement or locking of the entire wheelchair, so that the structure of the entire folding wheelchair can be further simplified.

[0012] In one embodiment, the guide cone has a guide slope, which extends from the fixed portion on the first protrusion to the guide protrusion; the guide protrusion has a guide arc, which extends from the fixed portion on the second protrusion to the guide cone. The plug-in end popped out of the elastic pin can slide on the guide slope and the guide arc, which is conducive to improving the displacement smoothness of the plug-in end.

[0013] In one embodiment, the connection track between the fixing part on the first protrusion, the guide slope on the guide cone, the guide arc on the guide protrusion and the fixing part on the second protrusion intersects with the ejection direction of the plug-in end on the elastic pin. In this way, the plug-in end ejected from the elastic pin can be smoothly transferred between the two fixing parts along the above track and automatically inserted into the target fixing part.

[0014] In one embodiment, the fixing portion on the first protrusion is a fixing groove, which is a rectangular groove that allows the plug-in end of the elastic pin to fine-tune the position in the groove body, so as to fine-tune the relative rotation angle between the second connecting member and the first connecting member, which is beneficial to fine-tune the locking position of the wheelchair in the unfolded state.

[0015] In one embodiment, the fixing portion on the second protrusion is a fixing hole, and the fixing hole matches the shape of the plug-in end of the elastic pin. After the elastic pin is plugged into the fixing hole on the second protrusion, the relative rotation angle between the first connecting member and the second connecting member is directly locked, which is conducive to locking the wheelchair in a folded state.

[0016] The structure of the elastic pin is improved. The elastic pin includes a plug, an elastic member and a hollow fixed cylinder. The fixed cylinder is used to be fixed on the first connecting member. The plug is sleeved with the fixed cylinder. The elastic member is arranged in the fixed cylinder. The elastic member is used to constrain the plug-in end of the plug to remain elastically extended outside the fixed cylinder. In this way, the elastic pin can remain plugged into the fixed part and maintain a locked state under normal conditions.

[0017] In one embodiment, one end of the latch has an operating cap for manual operation; the interior of the fixed tube has a receiving groove for installing the elastic member, the latch is provided with a convex ring located inside the fixed tube, the elastic member is arranged in the receiving groove of the fixed tube and abuts against the convex ring to keep pushing the convex ring, pushing the plug end on the latch toward the outside of the fixed tube, so that the plug end on the elastic pin remains in a pop-up state, which is conducive to automatic plugging with the fixed part and realizing automatic locking. Only when the operating cap is pulled by hand, the convex ring compresses the elastic member to make the plug end retreat from the fixed part to realize the unlocking operation.

[0018] In one embodiment, the first connecting member is provided with a mounting through hole, and the elastic pin is arranged in the mounting through hole through the fixing tube; during the relative rotation process of the first connecting member and the second connecting member, the projection of the mounting through hole can overlap with the position of the fixing portion at the pre-locking position. In this way, during the relative rotation process of the first connecting member and the second connecting member, as long as the fixing portion on the second connecting member corresponds to the position of the mounting through hole, the plug-in end of the elastic pin can be smoothly plugged with the fixing portion, thereby locking the relative rotation angle of the first connecting member and the second connecting member.

[0019] The present application also provides a foldable wheelchair, comprising a backrest assembly, a rear wheel assembly and the folding lock assembly, wherein the folding lock assembly is arranged between the backrest assembly and the rear wheel assembly, wherein a first connecting member in the folding lock assembly is installed and connected to the backrest assembly, and a second connecting member in the folding lock assembly is installed and connected to the rear wheel assembly. The folding state or unfolding state of the wheelchair can be locked by plugging and fixing the elastic pin on the first connecting member with the fixing part at the pre-locking position on the second connecting member.

[0020] The foldable wheelchair and its folding lock assembly provided by the present application have the following beneficial effects: compared with the prior art, the foldable wheelchair of the present application adopts a folding lock assembly, which can be used to fold the wheelchair up and down without tools, and the elastic pin in the folding lock assembly can lock the wheelchair in the folded state or the unfolded state. When unlocking, it is only necessary to pull out the elastic pin and lift the wheelchair to complete the switching between the states of the wheelchair. The guide mechanism in the folding lock assembly can make the plug-in end of the elastic pin automatically move to the fixed part of the pre-locking position and automatically complete the locking, which effectively improves the convenience and safety of the wheelchair during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic diagram of the structure of a foldable wheelchair in an unfolded state provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the three-dimensional structure of a folding lock assembly provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the exploded structure of the folding lock assembly provided in an embodiment of the present application;

[0025] Figure 4 A state view of the elastic pin provided in the embodiment of the present application during the transfer process between two fixing parts;

[0026] Figure 5 A side structural diagram of a second connecting member provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the internal structure of a wheelchair in an unfolded state provided by an embodiment of the present application;

[0028] Figure 7 A schematic diagram of the three-dimensional structure of a second connecting member provided in an embodiment of the present application;

[0029] Figure 8 A structural view of two protrusions and a guide mechanism on a second connecting member provided in an embodiment of the present application;

[0030] Fig. 9 A view of the internal structure of the folding lock assembly of the wheelchair in the unfolded state provided by an embodiment of the present application;

[0031] Fig.10A schematic diagram of the internal structure of the elastic pin provided in an embodiment of the present application;

[0032] Fig.11 An enlarged schematic diagram of a hinged portion between a first connecting member and a second connecting member provided in an embodiment of the present application;

[0033] Fig.12 A schematic diagram of the state structure of a foldable wheelchair during the folding process provided by an embodiment of the present application;

[0034] Fig.13 A schematic diagram of the folded state structure of a foldable wheelchair provided in an embodiment of the present application;

[0035] Fig.14 A schematic diagram of the structure of a folding lock assembly of a wheelchair in an unfolded state provided by an embodiment of the present application;

[0036] Fig.15 A schematic diagram of the structure of a folding lock assembly of a wheelchair during the folding process provided by an embodiment of the present application;

[0037] Fig.16 A schematic diagram of the structure of a folding lock assembly of a wheelchair in a folded state provided by an embodiment of the present application;

[0038] Fig.17 A view of the internal structure of the folding lock assembly of the wheelchair in the folded state provided by an embodiment of the present application;

[0039] Fig.18 A view of the internal structure of the folding lock assembly during the folding process of the wheelchair provided in an embodiment of the present application.

[0040] Among them, the reference numerals in the figure are:

[0041] 100-folding lock assembly; 101-rotating shaft; 102-pull ring;

[0042] 200-backrest assembly; 300-rear wheel assembly; 400-armrest assembly; 500-seat assembly; 600-support assembly; 700-footrest assembly; 800-front wheel assembly;

[0043] 1-first connecting member; 10-first through hole; 11-mounting through hole;

[0044] 2-second connecting member; 20-second through hole; 21-first protrusion; 22-second protrusion;

[0045] 3-elastic pin; 31-plug end; 32-plug pin; 321-operating cap; 322-convex ring; 33-elastic member; 34-fixing cylinder; 341-receiving groove;

[0046] 4-fixing part; 41-first fixing part; 411-fixing groove; 42-second fixing part; 421-fixing hole;

[0047] 5-guiding mechanism; 51-guiding cone; 511-guiding inclined plane; 52-guiding convex part; 521-guiding arc. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] Traditional foldable wheelchairs can only be locked when they are unfolded for use, but cannot be effectively locked when they are folded. This causes inconvenience to users when carrying the folded wheelchair, because the folded wheelchair may be unfolded at any time during the transportation process, which causes great inconvenience and risk of use.

[0053] Herein, the embodiment of the present application provides a new type of foldable wheelchair and its folding lock assembly, which can be folded up and down for storage without tools, and can also be locked in the unfolded and folded states, thereby improving the convenience and safety of the wheelchair during use, and effectively solving the technical problem that the traditional up and down foldable wheelchair cannot be locked in the folded state. It is now described in detail.

[0054] Please also read Figure 1 , Figure 2 and Figure 3 A foldable wheelchair is provided with a folding lock assembly 100 provided in an embodiment of the present application. The folding lock assembly 100 includes a first connecting member 1 and a second connecting member 2.

[0055] The first connecting member 1 can be a component installed and connected to the backrest assembly 200 on the wheelchair. The first connecting member 1 is provided with an elastic pin 3. The elastic pin 3 has a structure similar to a spring pin and can be manually operated to extend and retract the plug end 31 popped out of the elastic pin 3.

[0056] The second connecting member 2 may be a component that is mounted and connected to the rear wheel assembly 300 on the wheelchair, and the second connecting member 2 is connected to the first connecting member 1 via a rotating shaft 101. Figure 3 As shown, a first through hole 10 is provided on the first connecting member 1, and a second through hole 20 is provided on the second connecting member 2. The first through hole 10 and the second through hole 20 overlap each other, and the rotating shaft 101 is connected by passing through the through holes of the two to ensure the connection stability between the first connecting member 1 and the second connecting member 2.

[0057] The second connecting member 2 is provided with a fixing portion 4 for the elastic pin 3 to be inserted at the pre-locking position. Figure 3 The second connecting member 2 is provided with at least two fixing parts 4 for the elastic pins 3 to be inserted on the connecting end for connecting with the first connecting member 1. Thus, the elastic pins 3 can be operably inserted into the fixing parts 4 in the pre-locking position, thereby locking the relative rotation angle between the second connecting member 2 and the first connecting member 1.

[0058] The "pre-locking position" can be understood as a position pre-set in design for the elastic pin 3 to be locked. The pre-locking position at least includes the rotation limit position of the second connecting member 2 and the first connecting member 1. The "rotation limit position" can be understood as the maximum and minimum limit positions of the relative rotation limit range of the first connecting member 1 and the second connecting member 2.

[0059] Please also read Figure 4 and Figure 5 , the second connecting member 2 is provided with a first protrusion 21 and a second protrusion 22 for setting the fixing part 4 at the corresponding pre-locking position. In order to facilitate the identification of each fixing part 4, as shown in FIG. Figure 5As shown, the fixing portion 4 on the first protrusion 21 is defined as the first fixing portion 41, and the fixing portion 4 on the second protrusion 22 is defined as the second fixing portion 42. In this way, when the first connecting member 1 and the second connecting member 2 rotate relative to each other, the elastic pin 3 switches positions between the first protrusion 21 and the second protrusion 22, and is plugged and matched with the first fixing portion 41 on the first protrusion 21 or the second fixing portion 42 on the second protrusion 22.

[0060] A guide mechanism 5 is further provided between the first protrusion 21 and the second protrusion 22, and the guide mechanism 5 comprises a guide cone 51 provided on the first protrusion 21 and a guide protrusion 52 provided on the second protrusion 22, and the guide cone 51 and the guide protrusion 52 are extended toward each other. The guide mechanism 5 is used to guide the plug end 31 popped out of the elastic pin 3 along the track S to the fixing part 4 at the pre-locking position during the relative rotation process between the first connector 1 and the second connector 2, so as to lock the relative rotation angle between the second connector 2 and the first connector 1.

[0061] Compared with the prior art, the folding lock assembly 100 provided in the embodiment of the present application is that the first connecting member 1 and the second connecting member 2 are connected by a rotating shaft 101, wherein the first connecting member 1 is provided with an elastic pin 3, and the connecting end of the second connecting member 2 used for connecting with the first connecting member 1 is provided with at least two fixing parts 4 for inserting the elastic pin 3 in the pre-locking position, and the elastic pin 3 can be operated so that its plug end 31 is elastically inserted into the fixing part 4 in the pre-locking position, thereby locking the relative rotation angle between the first connecting member 1 and the second connecting member 2. This is conducive to cooperating with the locking operation of the wheelchair in the folded or unfolded state, and effectively ensuring the stability of the wheelchair in the folded or unfolded state.

[0062] In actual use, the wheelchair is generally unlocked only when the state needs to be changed. Since the elastic pin 3 has a force to keep the plug end 31 popped out, the elastic pin 3 needs to be manually operated to withdraw its plug end 31 from the fixing part 4 to complete the unlocking, so that the wheelchair state can be changed, that is, the first connecting member 1 and the second connecting member 2 are operated to rotate relative to each other. In this process, the elastic pin 3 needs to be pulled by the human hand to keep the plug end 31 of the elastic pin 3 in a contracted state, and the plug end 31 of the elastic pin 3 is not released until it is transferred to the target fixing part 4, so that the plug end 31 of the elastic pin 3 is inserted into the target fixing part 4; otherwise, during the state change of the wheelchair, the plug end 31 popped out of the elastic pin 3 cannot be automatically inserted into the target fixing part 4.

[0063] To this end, in the folding lock assembly 100 of the present application, a guide mechanism 5 is further provided between the first protrusion 21 and the second protrusion 22 on the second connecting member 2. The guide mechanism 5 is used to allow the plug-in end 31 that pops out of the elastic pin 3 to retreat from the original fixing portion 4 during the relative rotation between the first connecting member 1 and the second connecting member 2, and then be guided along the guide mechanism 5 to the fixing portion 4 at the target position to achieve automatic locking.

[0064] Thus, during the unlocking operation, the plug end 31 of the elastic pin 3 can be released after being manually operated to withdraw from the original fixing portion 4, and the plug end 31 of the elastic pin 3 can slide along the surface of the guide cone 51 to the surface of the guide protrusion 52, and smoothly slide into the second fixing portion 42 of the second protrusion 22; conversely, the plug end 31 of the elastic pin 3 can also be withdrawn from the second fixing portion 42, slide along the surface of the guide protrusion 52 to the surface of the guide cone 51, and smoothly insert into the first fixing portion 41 of the first protrusion 21. It can be seen that the elastic pin 3 does not need to be operated during the entire process of the wheelchair state change. The plug end 31 popped out of the elastic pin 3 can slide smoothly along the guide mechanism 5 to the fixing portion 4 at the target position, and automatically insert into the fixing portion 4 at the target position to automatically complete the locking, which effectively simplifies the operation steps and thus improves the convenience of use.

[0065] The foldable wheelchair of the present application adopts a folding lock assembly 100, which can be used to fold the wheelchair up and down for storage without tools. The elastic pin 3 in the folding lock assembly 100 can lock the wheelchair in the folded state or the unfolded state. In the unlocking operation, it is only necessary to pull up the elastic pin 3 and lift the wheelchair to complete the switching between the states of the wheelchair. The guide mechanism 5 in the folding lock assembly 100 can make the plug-in end 31 of the elastic pin 3 automatically move on the fixing part 4 in the pre-locking position and automatically complete the locking, effectively improving the convenience and safety of the wheelchair during use.

[0066] In the embodiment of the present application, the pre-locking position is preferably a rotation limit position formed by the first protrusion 21 abutting against the associated member connected to the first connecting member 1. Figure 6 The support assembly 600 is a linking member connected to the first connecting member 1. When the wheelchair is in the unfolded state, the second connecting member 2 rotates relative to the first connecting member 1 until the first protrusion 21 on the second connecting member 2 abuts against the portion M of the support assembly 600. At this time, the elastic pin 3 is locked on the first fixing portion 41 of the first protrusion 21 to fix the unfolded state of the wheelchair. The rear wheel assembly 300 supports the backrest assembly 200 and is combined with the above-mentioned abutting structure so that the elastic pin 3 will not be affected by the supporting force or the gravity of the components in this state, and therefore will not be deformed under external force.

[0067] As for when the wheelchair is in the folded state, each upper assembly of the wheelchair is stored and folded to determine another rotation limit position. When not subjected to the force attempting to change the rotation position, the elastic pin 3 is not subjected to force equally.

[0068] Therefore, the folding lock assembly of the present application not only plays a locking role but also a supporting role during the movement or locking of the entire wheelchair, thereby further simplifying the structure of the entire folding wheelchair.

[0069] In other embodiments of the present application, the pre-locking position may also include a rotation limit position formed by the first protrusion 21 abutting against the first connecting member 1. That is, when the first protrusion 21 on the second connecting member 2 abuts against the first connecting member 1 itself, it is the rotation limit, and at this time, the elastic pin 3 is simultaneously plugged into one of the fixing parts 4, and the above-mentioned technical effect is also achieved.

[0070] In one embodiment of the present application, please refer to Figure 7 and Figure 8 The guide cone 51 has a guide slope 511, which extends from the first fixing portion 41 on the first protrusion 21 to the guide protrusion 52. The guide protrusion 52 has a guide arc 521, which extends from the second fixing portion 42 on the second protrusion 22 to the guide cone 51. The plug-in end 31 popped out of the elastic pin 3 can slide on the guide slope 511 and the guide arc 521, which is conducive to improving the displacement smoothness of the plug-in end 31.

[0071] Among them, Fig. 9 As shown, the sequential connection track S between the first fixing portion 41 on the first protrusion 21, the guiding slope 511 on the guiding cone 51, the guiding arc 521 on the guiding protrusion 52 and the second fixing portion 42 on the second protrusion 22 intersects with the ejection direction F1 of the plug end 31 of the elastic pin 3.

[0072] Since the plug end 31 of the elastic pin 3 remains in the pop-up state after the human hand releases, the pop-up plug end 31 on the elastic pin 3 can be smoothly transferred between the two fixing parts 4 along the above-mentioned track S and automatically inserted into the target fixing part 4. In this way, the human hand does not need to operate the elastic pin 3 throughout the whole process, which effectively simplifies the operation steps.

[0073] It should be noted that the setting positions of the guide cone 51 and the guide protrusion 52 of the guide mechanism 5 on the second connecting member 2 can be interchanged according to actual applications, that is, the guide cone 51 can be set on the second protrusion 22, and the guide protrusion 52 can be set on the first protrusion 21, which can be determined according to the setting coordination of the first connecting member 1 and the second connecting member 2.

[0074] For the structure of the fixing portion 4, in one embodiment of the present application, please refer to Figure 5 and Figure 7 The first fixing portion 41 on the first protrusion 21 is a fixing groove 411, and the fixing groove 411 is a rectangular groove. The plug-in end 31 of the elastic pin 3 can be fine-tuned in the groove body, thereby fine-tuning the relative rotation angle between the second connecting member 2 and the first connecting member 1. This is conducive to fine-tuning the support angle of the rear wheel assembly 300 when the wheelchair is in the unfolded state.

[0075] In this embodiment, the fixing groove 411 is preferably a blind groove, which is beneficial to improve the structural strength of the first protrusion 21. In other embodiments, the fixing groove 411 can also be a through groove body, which is beneficial to adapt to the ejection length of the plug end 31 on different elastic pins 3, thereby improving adaptability.

[0076] Please also read Figure 5 and Figure 7 The second fixing portion 42 on the second protrusion 22 is a fixing hole 421, and the fixing hole 421 matches the plug-in end 31 of the elastic pin 3. After the elastic pin 3 is plugged into the fixing hole 421 on the second protrusion 22, the relative rotation angle between the first connecting member 1 and the second connecting member 2 is directly locked. This is conducive to locking the wheelchair in the folded state, preventing the parts on the wheelchair from being easily loosened, and thus improving the stability of the wheelchair in the folded state.

[0077] For the structure of the elastic pin 3, please refer to the embodiment of the present application. Fig. 9 and Fig.10 The elastic pin 3 includes a plug pin 32 , an elastic member 33 and a fixing tube 34 , wherein the fixing tube 34 is preferably a hollow sleeve, and the fixing tube 34 is used to be fixed on the first connecting member 1 .

[0078] The plug pin 32 is sleeved with the fixing tube 34 , so that the plug pin 32 passes through the inside of the fixing tube 34 and comes out from the other end of the fixing tube 34 . The part of the plug pin 32 that passes through the other end of the fixing tube 34 is the plug-in end 31 on the elastic pin 3 .

[0079] The elastic member 33 can preferably be a spring, which is arranged inside the fixed tube 34. The elastic member 33 is used to constrain the plug-in end 31 of the plug pin 32 to remain elastically extended outside the fixed tube 34, so that the elastic pin 3 can remain plugged into the fixed part 4 to maintain a locked state under normal conditions.

[0080] One end of the latch 32 has an operating cap 321 for manual operation, and the diameter of the operating cap 321 is larger than the inner diameter of the fixed tube 34, so that the operating cap 321 is placed outside one end of the fixed tube 34 and limits the length of the plug end 31 of the latch 32 extending from the other end of the fixed tube 34.

[0081] like Fig.10As shown, the interior of the fixing tube 34 has a receiving groove 341 for installing the elastic member 33 , and the outer periphery of the latch 32 is provided with a convex ring 322 located inside the fixing tube 34 , and the convex ring 322 is embedded in the receiving groove 341 inside the fixing tube 34 .

[0082] The elastic member 33 is arranged in the receiving groove 341 of the fixing tube 34 and abuts against the convex ring 322 to keep pushing the convex ring 322, pushing the plug end 31 on the plug pin 32 to the outside of the fixing tube 34, so that the plug end 31 on the elastic pin 3 remains in the pop-up state. This is conducive to automatic plugging with the fixing part 4 and realizing automatic locking. Only when the operating cap 321 is pulled manually can the convex ring 322 compress the elastic member 33 in the receiving groove 341, so that the plug end 31 of the plug pin 32 retreats from the fixing part 4, realizing the unlocking operation.

[0083] For the installation structure of the elastic pin 3 on the first connecting member 1, please refer to the embodiment of the present application. Figure 3 , Fig. 9 and Fig.11 The first connecting member 1 is provided with a mounting through hole 11 , and the elastic pin 3 is arranged on the mounting through hole 11 through a fixing tube 34 .

[0084] like Fig.11 As shown, during the relative rotation of the first connecting member 1 and the second connecting member 2 , the projection of the mounting through hole 11 will fall on the rotation trajectory G and can at least overlap with the first fixing portion 41 or the second fixing portion 42 .

[0085] In this way, the elastic pin 3 is arranged on the mounting through hole 11 of the first connecting member 1. During the relative rotation of the first connecting member 1 and the second connecting member 2, when the fixing portion 4 (the first fixing portion 41 or the second fixing portion 42) on the second connecting member 2 corresponds to the position of the mounting through hole 11, the plug-in end 31 of the elastic pin 3 can be smoothly plugged into the fixing portion 4, thereby locking the relative rotation angle of the first connecting member 1 and the second connecting member 2.

[0086] For the overall structure of the foldable wheelchair, please refer to the embodiments of the present application. Figure 1 , Fig.12 and Fig.13 The foldable wheelchair of the present application is an up-and-down folding wheelchair, including a folding lock assembly 100, a backrest assembly 200, a rear wheel assembly 300, an armrest assembly 400, a seat assembly 500, a support assembly 600, a footrest assembly 700 and a front wheel assembly 800 of the present application.

[0087] The armrest assembly 400 is fixed to the backrest assembly 200 and can rotate around it at a limited angle, making it convenient for the user to sit on the wheelchair from the side.

[0088] The pedal assembly 700 is fixed on the front wheel assembly 800, and the pedal assembly 700 can be rotated and stored around the front wheel assembly 800 to reduce the occupied space.

[0089] The above-mentioned backrest assembly 200, seat assembly 500, support assembly 600, front wheel assembly 800 and rear wheel assembly 300 are all connected by pins or screws, so that the connection parts between the components can rotate around the axis point to achieve overall folding and storage.

[0090] The folding lock assembly 100 provided in the embodiment of the present application is disposed at the connection portion of the rotating shaft 101 between the backrest assembly 200 and the rear wheel assembly 300. Figure 1 , Figure 2 and Figure 3 As shown, the first connecting member 1 in the folding lock assembly 100 is installed and connected with the backrest assembly 200, and the second connecting member 2 in the folding lock assembly 100 is installed and connected with the rear wheel assembly 300. The elastic pin 3 on the first connecting member 1 is plugged and fixed with the fixing portion 4 at the pre-locking position on the second connecting member 2, so that the wheelchair can be locked in the folded state or the unfolded state.

[0091] In the state change operation of the wheelchair, it is only necessary to pull out the plug end 31 of the elastic pin 3 from the fixing part 4 on the second connector 2 and lift the wheelchair to complete the switch between the states of the wheelchair. The guide mechanism 5 in the folding lock assembly 100 can make the plug end 31 of the elastic pin 3 automatically move on the fixing part 4 in the pre-locking position and automatically complete the locking. During this process, the human hand does not need to operate the elastic pin 3 throughout the whole process, which effectively simplifies the operation steps, thereby improving the convenience and safety of the wheelchair during use.

[0092] In this embodiment, please refer to Fig.12 and Fig.13 The folding lock assembly 100 is also provided with a pull ring 102. After the elastic pin 3 is unlocked by manual operation, the wheelchair can be lifted up by the pull ring 102 and the wheelchair state change operation can be performed, which effectively improves the convenience of the wheelchair state change operation.

[0093] The working principle of the entire folding lock assembly 100 is described in detail below in combination with the above overall structure:

[0094] Please also read Figure 1 , Fig. 9 , Fig.14 , the wheelchair is in the unfolded state. Fig. 9 As shown, at this time, the plug-in end 31 on the elastic pin 3 in the folding lock assembly 100 is plugged and fixed with the first fixing portion 41 on the second connecting member 2, thereby locking the unfolded state of the wheelchair.

[0095] Please also read Fig. 9 , Fig.14 and Fig.15 When the operating cap 321 on the elastic pin 3 is manually pulled in the F2 direction, the elastic member 33 in the elastic pin 3 will contract. At this time, the latch 32 of the elastic pin 3 moves in the F2 direction and withdraws from the first fixing portion 41 to release the second connecting member 2. The second connecting member 2 can rotate relative to the first connecting member 1 in the F3 direction. At this time, both the backrest assembly 200 and the rear wheel assembly 300 can be folded in the forward direction of the wheelchair. In actual operation, the entire wheelchair can be lifted up by hand through the pull ring 102, and gravity can be used to naturally fold the backrest assembly 200 and the rear wheel assembly 300, which is conducive to one-handed operation. Other components on the wheelchair can be folded and stored as needed.

[0096] Please also read Fig.16 and Fig.17 When the backrest assembly 200 and the rear wheel assembly 300 are folded into place, the second fixing portion 42 on the second connecting member 2 corresponds to the mounting through hole 11 on the first connecting member 1, and the elastic pin 3 arranged on the mounting through hole 11, its plug end 31 can be inserted into the second fixing portion 42 to lock the folded state of the wheelchair.

[0097] During the above switching process, the user can release the plug end 31 of the elastic pin 3 after withdrawing it from the first fixing portion 41, without having to operate the elastic pin 3 throughout the whole process. The plug end 31 on the elastic pin 3 remains in the popped-out state under the action of the elastic member 33. Fig.18 As shown, the plug end 31 can slide along the trajectory S from the guide slope 511 on the guide cone 51 to the guide arc 521 of the guide protrusion 52, and then reach the second fixing portion 42, and automatically insert into the second fixing portion 42 to complete automatic locking.

[0098] Please also read Fig.16 and Fig.17 When the wheelchair needs to be unfolded again, the person can manually release the connection between the elastic pin 3 and the second fixing part 42 and then let go. During the relative rotation of the second connecting member 2 and the first connecting member 1 in the opposite direction of F3, the plug-in end 31 on the elastic pin 3 can also automatically return to the first fixing part 41 along the track S on the guide mechanism 5, and automatically insert into the first fixing part 41 to re-lock the unfolded state of the wheelchair.

[0099] It can be seen that on the foldable wheelchair provided in the embodiment of the present application, the structure of the folding lock assembly 100 is very simple, and no auxiliary tools are required, and the unlocking operation can be performed by hand. The unfolded state or folded state of the wheelchair can be locked by manually operating the elastic pin 3 to be plugged and fixed with the fixing part 4 in the pre-locking position. During the state change of the wheelchair, the human hand does not need to operate the elastic pin 3 throughout the whole process, and can be released after unlocking once. The plug-in end 31 of the elastic pin 3 can automatically slide to the target fixing part 4 along the guide mechanism 5 between the two fixing parts 4 to complete the automatic locking, which effectively simplifies the operation and thus improves the convenience and safety of the wheelchair during use.

[0100] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A folding lock assembly, characterized in that: include: A first connecting member, provided with an elastic pin; A second connecting member is connected to the first connecting member via a rotating shaft, a fixing portion for the elastic pin to be inserted into the pre-locking position of the second connecting member is provided, and the pre-locking position at least includes a rotation limit position of the second connecting member and the first connecting member; Wherein, the second connecting member is provided with a first protrusion and a second protrusion for setting the fixing part at a position corresponding to the pre-locking position, and a guide mechanism is provided between the first protrusion and the second protrusion; the guide mechanism comprises a guide cone provided on the first protrusion and a guide convex part provided on the second protrusion, and the guide cone and the guide convex part are extended toward each other; The guiding mechanism is used to guide the elastic pin to the fixing portion, so as to lock the relative rotation angle between the second connecting member and the first connecting member.

2. The folding lock assembly according to claim 1, characterized in that: The pre-locking position at least includes a rotation limit position formed by the first protrusion abutting against the first connecting member, or a related member connected to the first connecting member.

3. The folding lock assembly according to claim 1, characterized in that: The guide cone has a guide slope, which extends from the fixing portion on the first protrusion toward the guide convex portion; the guide convex portion has a guide arc, which extends from the fixing portion on the second protrusion toward the guide cone.

4. The folding lock assembly according to claim 3, characterized in that: The sequential connection tracks among the fixing portion on the first protrusion, the guiding slope on the guiding cone, the guiding arc on the guiding protrusion and the fixing portion on the second protrusion intersect with the ejection direction of the plug-in end on the elastic pin.

5. The folding lock assembly according to claim 1, characterized in that: The fixing portion on the first protrusion is a fixing groove, and the fixing groove is a rectangular groove that allows the plug-in end of the elastic pin to fine-tune the position in the groove body.

6. The folding lock assembly according to claim 1, characterized in that: The fixing portion on the second protrusion is a fixing hole, and the fixing hole matches the plug-in end of the elastic pin in shape.

7. The folding lock assembly according to claim 1, characterized in that: The elastic pin includes a latch, an elastic member and a hollow fixed tube, wherein the fixed tube is used to be fixed on the first connecting member; the latch is sleeved with the fixed tube; the elastic member is arranged in the fixed tube, and the elastic member is used to constrain the plug-in end of the latch to remain elastically extended outside the fixed tube.

8. The folding lock assembly according to claim 7, characterized in that: One end of the latch has an operating cap for manual operation; the interior of the fixed tube has a receiving groove for installing the elastic member, the latch is provided with a convex ring located inside the fixed tube, the elastic member is arranged in the receiving groove of the fixed tube and abuts against the convex ring to keep pushing the convex ring.

9. The folding lock assembly according to claim 7, characterized in that: The first connecting member is provided with a mounting through hole, and the elastic pin is arranged in the mounting through hole through the fixing tube; during the relative rotation of the first connecting member and the second connecting member, the projection of the mounting through hole can overlap with the position of the fixing portion at the pre-locking position.

10. A foldable wheelchair, characterized in that: It comprises a backrest assembly, a rear wheel assembly and a folding lock assembly as described in any one of claims 1 to 9, wherein the folding lock assembly is arranged between the backrest assembly and the rear wheel assembly, a first connecting member in the folding lock assembly is installed and connected to the backrest assembly, and a second connecting member in the folding lock assembly is installed and connected to the rear wheel assembly.

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