CN220447948U - Unpowered running gear and automatic brake mechanism thereof - Google Patents
Unpowered running gear and automatic brake mechanism thereof Download PDFInfo
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- CN220447948U CN220447948U CN202321776008.8U CN202321776008U CN220447948U CN 220447948 U CN220447948 U CN 220447948U CN 202321776008 U CN202321776008 U CN 202321776008U CN 220447948 U CN220447948 U CN 220447948U
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- 230000007246 mechanism Effects 0.000 title claims abstract description 97
- 239000007788 liquid Substances 0.000 claims abstract description 106
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000002441 reversible effect Effects 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 2
- 230000000670 limiting effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The utility model relates to the field of wheelchair travel control devices, and discloses an unpowered walking device and an automatic braking mechanism thereof, wherein the unpowered walking device comprises a medium liquid storage box body, a hydraulic pump, a plurality of one-way valves, a flow control valve and a hydraulic braking mechanism; the hydraulic pump is connected with the wheel shaft of the unpowered running device through the transmission mechanism, and the forward running direction of the hydraulic pump is consistent with the running direction of the wheels of the unpowered running device; the hydraulic pump is connected with the medium liquid storage box body through a liquid inlet pipeline, and the hydraulic pump is connected with the hydraulic braking mechanism through a liquid outlet pipeline, and the hydraulic braking mechanism is used for realizing braking of the unpowered running device; and a return pipeline is connected between the forward outlet of the hydraulic pump and a connecting node of the hydraulic braking mechanism and the medium liquid storage box body, and a flow control valve is arranged on the return pipeline. The automatic braking mechanism provided by the utility model can output different braking forces according to different travelling speeds, so that the danger caused by too high travelling speed is avoided.
Description
Technical Field
The utility model relates to the field of wheelchair travel control devices, in particular to an unpowered walking device and an automatic braking mechanism thereof.
Background
Hand push wheelchairs, shopping carts, elderly rollator, child scooters and the like are very common unpowered running devices. The hand push wheelchair is a walking tool used for people with inconvenient legs and feet, such as the elderly and disabled, and has been widely used at present. In order to improve the use safety of unpowered walking devices such as hand-push wheelchairs and the like, some devices are provided with downhill speed limiting devices.
The automatic speed limiting device for the wheelchair comprises a frame and an arc sleeve, wherein one side of the frame is fixedly provided with the arc sleeve, the bottom of the frame is rotatably provided with a clutch which can perform stable closing linkage along with the increase of speed, the top of the frame is provided with an opening and closing device which can stably change the resistance, and the opening and closing device is in transmission connection with the clutch; the automatic speed limiting device for the wheelchair is fixedly arranged with the wheelchair through the arc sleeve, when the wheelchair moves in an overspeed manner, the clutch is pushed by air flow to rotate at a high speed, and accordingly the touch-control opening and closing device opens the windward side, and resistance of the device is increased. The utility model has the function of automatically limiting the wheelchair, but the wind resistance is utilized to limit the speed, so that the braking speed limiting effect is not ideal, the sensitivity is not high, and the braking force cannot be increased along with the increase of the travelling speed.
As another example, chinese patent application publication No. CN112914861a and publication No. 2021.06.08 discloses a downhill speed-limiting anti-falling wheelchair, which comprises a chassis, a riding component disposed on the upper side of the chassis, a reinforcing advancing component disposed on the front and rear sides of the chassis, and a power generation testing component disposed in the middle of the chassis, wherein the riding component comprises a riding mechanism for a user to ride, and an anti-falling mechanism for preventing the passenger from falling forward when braking, and the reinforcing advancing component comprises a advancing mechanism for advancing the wheelchair and a stabilizing mechanism for stabilizing the wheelchair when braking. This can utilize the rotation of wheel to generate electricity to store the electricity, can incline the wheel when the speed is too fast, thereby increase the stability of vehicle, prevent the occurence of failure that sends the roll-over, the seat back rotates backward simultaneously, makes the human body lean back backward, prevents to lead to the passenger to be fallen out because of speed variation, thereby restriction is carried out the speed reduction to the rotational speed of wheel when doing above-mentioned two points. However, the specific brake speed limiting structure is not involved, and the aim of preventing falling is achieved only by improving the wheelchair structure.
Disclosure of Invention
The utility model aims to provide an unpowered walking device and an automatic braking mechanism thereof, which can output different braking forces according to different travelling speeds, avoid danger caused by too high travelling speed, and further provide at least one beneficial selection or creation condition for solving one or more technical problems in the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
An automatic braking mechanism of an unpowered walking device comprises a medium liquid storage box body, a hydraulic pump, a plurality of one-way valves, a flow control valve and a hydraulic braking mechanism; the hydraulic pump is connected with the wheel shaft of the unpowered running device through the transmission mechanism, and the forward running direction of the hydraulic pump is consistent with the running direction of the wheels of the unpowered running device; the hydraulic pump comprises a hydraulic pump body, a medium liquid storage box body, a hydraulic braking mechanism, a hydraulic control mechanism and a hydraulic control system, wherein the hydraulic pump body is provided with a hydraulic control system, the medium liquid storage box body is provided with a medium liquid storage box body, a medium liquid storage box is provided with a medium liquid storage box, and a medium liquid storage box is provided with a medium liquid storage box body, and the medium liquid storage box body is provided with a medium liquid storage box body; and a return pipeline is connected between the forward outlet of the hydraulic pump and a connecting node of the hydraulic braking mechanism and the medium liquid storage box body, and the flow control valve is arranged on the return pipeline.
More preferably, the hydraulic pump is a reversible gear pump.
More preferably, a protection pipe is connected between the forward inlet and the forward outlet of the hydraulic pump, and a first check valve is installed on the protection pipe, and the first check valve is in one-way conduction in the direction from the forward inlet to the forward outlet.
More preferably, the medium liquid storage tank is a hydraulic oil tank.
More preferably, the flow control valve is a throttle valve.
More preferably, the hydraulic brake mechanism has a hydraulic chamber, a brake valve stem slidably mounted in the hydraulic chamber and sealed, and a return spring connected to the brake valve stem.
More preferably, the transmission mechanism is a gear transmission mechanism or a connecting transmission mechanism, and the speed change is also carried out according to different actual requirements.
More preferably, a second one-way valve is arranged on the liquid inlet pipeline, and the second one-way valve is conducted unidirectionally from the medium liquid storage box body to the forward inlet direction of the hydraulic pump; a third one-way valve is arranged on the liquid outlet pipeline, the third one-way valve is conducted in a one-way from the forward outlet of the hydraulic pump to the direction of the braking mechanism, and the flow control valve is connected between the outlet of the third one-way valve and the medium liquid storage box body; a second liquid inlet pipeline is further connected between the forward outlet of the hydraulic pump and the medium liquid storage box body, a fourth one-way valve is arranged on the second liquid inlet pipeline, and the fourth one-way valve is conducted in a one-way mode from the medium liquid storage box body to the forward outlet direction of the hydraulic pump.
On the other hand, the utility model also provides an unpowered walking device which is provided with the automatic braking mechanism.
More preferably, the unpowered walking device is a hand push wheelchair, a shopping cart, an elderly walking aid or a child scooter.
The technical scheme provided by the utility model has at least the following technical effects or advantages.
1. The hydraulic pump is linked with the wheel axle of the unpowered running device through the transmission mechanism, and the hydraulic braking principle is combined; when the hydraulic pump works, the hydraulic pump is driven to rotate through the transmission mechanism, and the hydraulic pump conveys liquid to the hydraulic braking mechanism to perform braking action by applying the suction and discharge working principle. When the running speed of the unpowered running device is lower than the set speed, the medium liquid output by the hydraulic pump is small, the medium liquid flows back to the medium liquid storage box body through the flow control valve, and the hydraulic braking mechanism does not act. When the running speed of the unpowered running device is higher than the set speed, the medium liquid output by the hydraulic pump is large, and the medium liquid enters the hydraulic braking mechanism and acts by the hydraulic braking mechanism to brake. In the braking process, if the running speed of the unpowered running device is still increased, the medium liquid amount output by the hydraulic pump is continuously increased, so that more medium liquid enters the hydraulic braking mechanism, the braking force of the hydraulic braking mechanism is increased, and the danger caused by continuously increasing the running speed is avoided; in the braking process, if the walking speed of the unpowered walking device is reduced, the medium liquid output by the hydraulic pump is reduced, so that the medium liquid entering the hydraulic braking mechanism is less, the braking force of the hydraulic braking mechanism is reduced, rollover, sideslip, human body forward flushing and the like caused by excessively rapid deceleration are avoided, and the deceleration process is comfortable and safe.
2. Through setting up second feed liquor pipeline, second check valve, third check valve and fourth check valve etc. realize the two-way braking function of automatic brake mechanism, no matter unpowered running gear is walking in the forward, and the reverse walking all has self-adaptation braking function, safer.
Drawings
Fig. 1 is a schematic structural diagram of an automatic braking mechanism according to embodiment 1 of the present utility model.
Fig. 2 is a schematic diagram showing a forward running state of the automatic braking mechanism according to embodiment 1 of the present utility model.
Fig. 3 is a schematic diagram showing a reverse operation state of the automatic braking mechanism according to embodiment 1 of the present utility model.
Fig. 4 is a schematic structural diagram of an automatic braking mechanism according to embodiment 2 of the present utility model.
Fig. 5 is a schematic diagram showing a forward running state of the automatic braking mechanism according to embodiment 2 of the present utility model.
Fig. 6 is a schematic diagram showing a reverse operation state of the automatic braking mechanism according to embodiment 2 of the present utility model.
Arrows in fig. 3, 4, 5, and 6 represent the flow direction of the medium flow.
Reference numerals illustrate.
1: medium liquid storage box, 2: hydraulic pump, 3: flow control valve, 4: hydraulic brake mechanism, 5: transmission mechanism, 6: liquid inlet pipeline, 7: liquid outlet pipe, 8: reflux pipe, 9: protection pipe, 10: first check valve, 11: second check valve, 12: third check valve, 13: second liquid inlet pipe, 14: and a fourth one-way valve.
Detailed Description
The following description of the specific embodiments of the present utility model is further provided with reference to the accompanying drawings, so that the technical scheme and the beneficial effects of the present utility model are more clear and definite. The embodiments described below are exemplary by referring to the drawings for the purpose of illustrating the utility model and are not to be construed as limiting the utility model.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, or may be learned by practice of the utility model.
Example 1
Referring to fig. 1, an automatic braking mechanism of an unpowered walking device comprises a medium liquid storage box body 1, a hydraulic pump 2, a plurality of one-way valves, a flow control valve 3 and a hydraulic braking mechanism 4; the hydraulic pump 2 is connected with wheel shafts of the unpowered running device through a transmission mechanism 5, and the forward running direction of the hydraulic pump 2 is consistent with the running direction of the wheels of the unpowered running device; the forward inlet of the hydraulic pump 2 is connected with the medium liquid storage box body 1 through a liquid inlet pipeline 6, the forward outlet of the hydraulic pump 2 is connected with the hydraulic braking mechanism 4 through a liquid outlet pipeline 7, and the hydraulic braking mechanism 4 is used for realizing braking of the unpowered running gear; a return line 8 is connected between the connection node of the forward outlet of the hydraulic pump 2 and the hydraulic brake mechanism 4 and the medium liquid storage tank 1, and the flow control valve 3 is mounted on the return line 8.
The medium liquid is preferably brake liquid, which is also called brake liquid, and when the brake liquid is subjected to pressure, all parts of the pressure conduction liquid can be quickly and uniformly conducted, so that hydraulic braking is realized. It is obvious that the person skilled in the art can also replace the brake fluid with other media fluids known in the prior art or available in the future according to the actual needs; the present embodiment is not limited.
In this embodiment, the medium liquid storage tank 1 is preferably a hydraulic tank, and the hydraulic pump 2 is preferably a gear pump capable of performing forward and reverse operations. In order to avoid reverse idle load and damage to the flow control valve 3, a protection pipe 9 is preferably connected between the forward inlet and the forward outlet of the hydraulic pump 2, and a first check valve 10 is mounted on the protection pipe 9, and the first check valve 10 is unidirectional in a direction from the forward inlet to the forward outlet. Thus, when the hydraulic pump 2 is reversed, the medium flows out from the forward inlet, circulates in through the first check valve 10, and flows in from the forward outlet, as shown in fig. 3; further, the problem of avoiding reverse idle load and damage to the flow control valve 3 is solved. Since the first check valve 10 has no resistance in the forward direction, the medium liquid does not enter the brake mechanism 4 for braking.
In this embodiment, the flow control valve 3 may be a throttle valve, and the hydraulic brake mechanism 4 is a brake mechanism, which is known in the art, and has a hydraulic chamber, a brake valve rod slidably mounted in the hydraulic chamber and sealed, and a return spring connected to the brake valve rod. The transmission mechanism 5 may be a gear change transmission mechanism or a chain transmission mechanism or the like which are known in the prior art.
During operation, the hydraulic pump 2 is driven to rotate by the transmission mechanism 5, and the hydraulic pump 2 conveys liquid to the hydraulic braking mechanism 4 for braking action by applying a suction and discharge working principle. When the traveling speed of the unpowered traveling device is lower than the set speed, the medium liquid output by the hydraulic pump 2 is small, the medium liquid flows back to the medium liquid storage box 1 through the flow control valve 3, and the hydraulic braking mechanism 4 does not act. When the traveling speed of the unpowered traveling device is higher than the set speed, the medium liquid output by the hydraulic pump 2 is large, and the medium liquid enters the hydraulic braking mechanism 4 and the hydraulic braking mechanism 4 to act for braking, as shown in fig. 2.
In the braking process, if the running speed of the unpowered running device is still increased, the medium liquid output by the hydraulic pump 2 is continuously increased, so that more medium liquid enters the hydraulic braking mechanism 4, the braking force of the hydraulic braking mechanism 4 is increased, and the danger caused by continuously increasing the running speed is avoided; in the braking process, if the walking speed of the unpowered walking device is reduced, the medium liquid output by the hydraulic pump 2 is reduced, so that the medium liquid entering the hydraulic braking mechanism 4 is less, the braking force of the hydraulic braking mechanism 4 is reduced, rollover, sideslip, human body forward stroke and the like caused by excessively rapid deceleration are avoided, and the deceleration process is comfortable and safe.
Example 2
Referring to fig. 4, an automatic brake mechanism of an unpowered walking device has a structure substantially identical to that of embodiment 1, except that the automatic brake mechanism of an unpowered walking device provided in this embodiment has a bidirectional brake function.
In order to realize the bidirectional braking function, a second one-way valve 11 is arranged on the liquid inlet pipeline 6, and the second one-way valve 11 is communicated in a one-way from the medium liquid storage box body 1 to the forward inlet direction of the hydraulic pump 2; a third one-way valve 12 is arranged on the liquid outlet pipeline 7, the third one-way valve 12 is conducted unidirectionally in the direction from the forward outlet of the hydraulic pump 2 to the braking mechanism 4, and the flow control valve 3 is connected between the outlet of the third one-way valve 12 and the medium liquid storage box 1; a second liquid inlet pipeline 13 is further connected between the forward outlet of the hydraulic pump 2 and the medium liquid storage box 1, a fourth one-way valve 14 is arranged on the second liquid inlet pipeline 13, and the fourth one-way valve 14 is in one-way conduction from the medium liquid storage box 1 to the forward outlet direction of the hydraulic pump 2.
Referring to fig. 5, when the hydraulic pump 2 is operated in the forward direction, the medium liquid is sucked out of the medium liquid storage tank 1 by the hydraulic pump 2, flows through the second check valve 11, the hydraulic pump 2, the third check valve 12, and the flow control valve 3 in this order, and is then discharged back to the medium liquid storage tank 1 to circulate. When the traveling speed of the unpowered traveling device is lower than the set speed, the medium liquid output by the hydraulic pump 2 is small, the medium liquid flows back to the medium liquid storage box 1 through the flow control valve 3, and the hydraulic braking mechanism 4 does not act. When the traveling speed of the unpowered traveling device is higher than the set speed, the medium liquid output by the hydraulic pump 2 is large, and the medium liquid enters the hydraulic braking mechanism 4 and acts on the hydraulic braking mechanism 4 to brake.
Referring to fig. 6, when the hydraulic pump 2 is operated in the reverse direction, the medium liquid is sucked out of the medium liquid storage tank 1 by the hydraulic pump 2, flows through the fourth check valve 14, the hydraulic pump 2, the first check valve 10 and the flow control valve 3 on the second liquid inlet pipe 13 in sequence, and is then discharged back to the medium liquid storage tank 1 to realize circulation. When the traveling speed of the unpowered traveling device is lower than the set speed, the medium liquid output by the hydraulic pump 2 is small, the medium liquid flows back to the medium liquid storage box 1 through the flow control valve 3, and the hydraulic braking mechanism 4 does not act. When the traveling speed of the unpowered traveling device is higher than the set speed, the medium liquid output by the hydraulic pump 2 is large, and the medium liquid enters the hydraulic braking mechanism 4 and acts on the hydraulic braking mechanism 4 to brake.
The automatic braking mechanism of the unpowered walking device provided by the embodiment has all the technical effects of the embodiment 1, and also realizes braking of the unpowered walking device at too high a reverse walking speed.
Example 3
An unpowered walking device is a hand push wheelchair, and the automatic braking mechanism in embodiment 1 is arranged on the hand push wheelchair.
Obviously, the unpowered walking device provided in this embodiment has all the technical effects of embodiment 1, and will not be described in detail herein.
In some embodiments, the unpowered running gear may also be a shopping cart, an elderly walker, a child scooter, or the like; the present embodiment is not limited.
It should be further noted that, in the description of the present utility model, terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. refer to the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features, and in the description of the utility model, "at least" means one or more, unless clearly specifically defined otherwise.
In the present utility model, unless explicitly stated and limited otherwise, the terms "assembled," "connected," and "connected" are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; can be directly connected or connected through an intermediate medium, and can be communicated with the inside of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless specified and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "below," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply representing the first feature as having a higher level than the second feature. The first feature being "above," "below," and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or simply indicating that the first feature is level below the second feature.
It will be understood by those skilled in the art from the foregoing description of the structure and principles that the present utility model is not limited to the specific embodiments described above, but is intended to cover modifications and alternatives falling within the spirit and scope of the utility model as defined by the appended claims and their equivalents. The portions of the detailed description that are not presented are all prior art or common general knowledge.
Claims (10)
1. An automatic braking mechanism of an unpowered walking device is characterized by comprising a medium liquid storage box body, a hydraulic pump, a plurality of one-way valves, a flow control valve and a hydraulic braking mechanism; the hydraulic pump is connected with the wheel shaft of the unpowered running device through the transmission mechanism, and the forward running direction of the hydraulic pump is consistent with the running direction of the wheels of the unpowered running device; the hydraulic pump comprises a hydraulic pump body, a medium liquid storage box body, a hydraulic braking mechanism, a hydraulic control mechanism and a hydraulic control system, wherein the hydraulic pump body is provided with a hydraulic control system, the medium liquid storage box body is provided with a medium liquid storage box body, a medium liquid storage box is provided with a medium liquid storage box, and a medium liquid storage box is provided with a medium liquid storage box body, and the medium liquid storage box body is provided with a medium liquid storage box body; and a return pipeline is connected between the forward outlet of the hydraulic pump and a connecting node of the hydraulic braking mechanism and the medium liquid storage box body, and the flow control valve is arranged on the return pipeline.
2. The automatic braking mechanism of an unpowered walking device as set forth in claim 1, wherein the hydraulic pump is a gear pump capable of forward and reverse.
3. The automatic brake mechanism of an unpowered walking device according to claim 1 or 2, wherein a protection pipe is connected between the forward inlet and the forward outlet of the hydraulic pump, and a first check valve is mounted on the protection pipe, and the first check valve is in unidirectional conduction in a direction from the forward inlet to the forward outlet.
4. The automatic braking mechanism of an unpowered walking device as set forth in claim 1, wherein the medium liquid storage tank is a hydraulic oil tank.
5. The automatic brake mechanism of an unpowered walking device of claim 1, wherein the flow control valve is a throttle valve.
6. The automatic brake mechanism of an unpowered walking device as set forth in claim 1, wherein said hydraulic brake mechanism has a hydraulic chamber, a brake valve stem slidably mounted in said hydraulic chamber and sealed, and a return spring connected to said brake valve stem.
7. The automatic braking mechanism of an unpowered walking device as set forth in claim 1, wherein the transmission mechanism is a gear transmission mechanism or a chain transmission mechanism.
8. The automatic brake mechanism of an unpowered walking device according to claim 1, wherein a second one-way valve is arranged on the liquid inlet pipeline, and the second one-way valve is conducted unidirectionally from the medium liquid storage tank body to the forward inlet direction of the hydraulic pump; a third one-way valve is arranged on the liquid outlet pipeline, the third one-way valve is conducted in a one-way from the forward outlet of the hydraulic pump to the direction of the braking mechanism, and the flow control valve is connected between the outlet of the third one-way valve and the medium liquid storage box body; a second liquid inlet pipeline is further connected between the forward outlet of the hydraulic pump and the medium liquid storage box body, a fourth one-way valve is arranged on the second liquid inlet pipeline, and the fourth one-way valve is conducted in a one-way mode from the medium liquid storage box body to the forward outlet direction of the hydraulic pump.
9. An unpowered walking device having an automatic braking mechanism as set forth in any one of claims 1 to 8.
10. The unpowered walking device of claim 9, wherein the unpowered walking device is a push wheelchair, a shopping cart, an elderly walker, or a child scooter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321776008.8U CN220447948U (en) | 2023-07-06 | 2023-07-06 | Unpowered running gear and automatic brake mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321776008.8U CN220447948U (en) | 2023-07-06 | 2023-07-06 | Unpowered running gear and automatic brake mechanism thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220447948U true CN220447948U (en) | 2024-02-06 |
Family
ID=89737933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321776008.8U Active CN220447948U (en) | 2023-07-06 | 2023-07-06 | Unpowered running gear and automatic brake mechanism thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220447948U (en) |
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2023
- 2023-07-06 CN CN202321776008.8U patent/CN220447948U/en active Active
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