CN110331881A - A kind of parking blocking mechanism - Google Patents
A kind of parking blocking mechanism Download PDFInfo
- Publication number
- CN110331881A CN110331881A CN201910669610.3A CN201910669610A CN110331881A CN 110331881 A CN110331881 A CN 110331881A CN 201910669610 A CN201910669610 A CN 201910669610A CN 110331881 A CN110331881 A CN 110331881A
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- China
- Prior art keywords
- shaft
- blocking mechanism
- gear
- crawler belt
- parking
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/42—Devices or arrangements peculiar to garages, not covered elsewhere, e.g. securing devices, safety devices, monitoring and operating schemes; centering devices
- E04H6/422—Automatically operated car-parks
- E04H6/424—Positioning devices
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The present invention discloses a kind of parking blocking mechanism, comprising: floor, fixed bar, feedback drag release gear.Fixed bar is fixed on floor, and feedback drag release gear is installed on floor.Feedback drag release gear includes: pedestal, free shaft, unidirectional shaft, crawler belt；Free shaft and the rotation of unidirectional shaft are set on pedestal；Crawler belt is end to end to be surrounded in free shaft and unidirectional shaft；The both ends of free shaft are equipped with first gear, and first gear is engaged with crawler belt；The both ends of unidirectional shaft are equipped with second gear, and second gear is engaged with crawler belt；Fixing sleeve is connected to ratchet on the axis body of unidirectional shaft, and rotation is equipped with one-way check piece on pedestal, and one end of one-way check piece is pressed on the wheel face of ratchet.Parking blocking mechanism of the invention, may be implemented the release of feedback resistance, on the one hand, reduce many and diverse operating procedure for having experience driver, on the other hand, the maloperation for reducing new hand driver is damaged to vehicle bring.
Description
Technical field
The present invention relates to parking lot technical fields, more particularly to a kind of parking blocking mechanism.
Background technique
As shown in Figure 1, its schematic diagram for the parking storage of automobile 10.In general, people can be by parking area in parking lot
Setting-out processing is carried out, to obtain multiple independent parking stalls, each independent parking stall is for parking a trolley.
During parking, in order to allow driver whether in place can to perceive vehicle that it is driven, especially exist
A parking countercheck rod 20 is provided on parking stall.After the front-wheel or rear-wheel of vehicle touch this parking countercheck rod 20, parking
Countercheck rod 20 can generate a feedback resistance to the front-wheel or rear-wheel of vehicle, and the driver being sitting in driver's cabin can perceive this time
Resistance is presented, in this way, driver will know that current vehicle has stopped in place.
It can be seen from the above, parking countercheck rod 20 can generate one to the front-wheel or rear-wheel of vehicle and return during parking
Resistance is presented, although this feedback resistance can help driver to incude whether vehicle has stopped in place, this feedback resistance
It can make troubles to vehicle, exclude this feedback resistance if do not taken appropriate measures, vehicle can be by during parking
To the influence of this feedback resistance, so that the external force that vehicle is applied when parking for a long time by parking countercheck rod 20, long and long
It, the related device on vehicle can occur relaxation or damage.
Since traditional parking countercheck rod 20 is fixedly mounted, for example, parking countercheck rod 20 is usually circular tube shaped steel knot
The parking countercheck rod 20 of such circular tube shaped steel construction is directly fixed on ground 30 by structure design in the way of lock screw, from
And realize fixed immovable installation.
Then, in order to lay down above-mentioned feedback resistance, it is necessary to which driver makes adjustment to vehicle itself, unloads to realize
Power.
For experienced driver, they are at frequent way: drive vehicle storage, when vehicle front-wheel or
When rear-wheel touches parking countercheck rod 20, service brake is stepped on, hangs N grades, loose service brake hangs P grades, pulls the hand brake, and stops working.It can be seen from the above, working as
For experienced driver when loose service brake, vehicle would be at freely unbonded state, and then, parking countercheck rod 20 is right
Feedback resistance caused by front-wheel or rear-wheel will be released.
And for new hand driver, they are at frequent way: drive vehicle storage, when vehicle front-wheel or after
When wheel touches parking countercheck rod 20, service brake is stepped on, P grades is hung, pulls the hand brake, is stopped working.It follows that new hand driver compared to have through
The driver tested, the step for having lacked N grades of extension and loose service brake, then, parking countercheck rod 20 is returned to caused by front-wheel or rear-wheel
Feedback resistance just cannot access effective release.
For experienced driver, although they can during parking will caused by
Feedback resistance is discharged, but the step of operating is unavoidably many and diverse；And for new hand driver, their operating procedure is not
Feedback resistance can be made effectively to be discharged, over time, the performance of vehicle will receive influence.
Therefore, a kind of parking blocking mechanism how is designed and developed, takes on extraneous parking blocking mechanism and arranges accordingly
It applies, realizes the release of feedback resistance, on the one hand, reduce many and diverse operating procedure for having experience driver, on the other hand, reduce new hand
The maloperation of driver is damaged to vehicle bring, this is to design and develop personnel's technical issues that need to address.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of parking blocking mechanism is provided, in the external world
It takes appropriate measures on parking blocking mechanism, realizes the release of feedback resistance, on the one hand, reduction has that experience driver's is many and diverse
Operating procedure, on the other hand, the maloperation for reducing new hand driver are damaged to vehicle bring.
The purpose of the present invention is achieved through the following technical solutions:
A kind of parking blocking mechanism, comprising: floor, fixed bar, feedback drag release gear；The fixed bar
It is fixed on the floor, the feedback drag release gear is installed on the floor；
The feedback drag release gear includes: pedestal, free shaft, unidirectional shaft, crawler belt；The free shaft and institute
It states unidirectional shaft rotation to be set on the pedestal, the rotation axis of the rotation axis of the free shaft and the unidirectional shaft is mutually flat
Row, the free shaft and the unidirectional shaft are spaced apart from each other setting；The crawler belt is end to end to be surrounded on the free shaft
In the unidirectional shaft；
The both ends of the free shaft are equipped with first gear, and the first gear is engaged with the crawler belt；Described unidirectional turn
The both ends of axis are equipped with second gear, and the second gear is engaged with the crawler belt；
Fixing sleeve is connected to ratchet on the axis body of the unidirectional shaft, and rotation is equipped with one-way check piece on the pedestal, described
One end of one-way check piece is pressed on the wheel face of the ratchet.
The floor has smooth plate face in one of the embodiments,.
The fixed bar is cylinder rod-like structure in one of the embodiments,.
The fixed bar is screwed in the plate face on the floor in one of the embodiments,.
Installation groove, the feedback resistance release dress are offered in the plate face on the floor in one of the embodiments,
It sets and is contained in the installation groove, the transmission plane of the crawler belt is concordant with the plate face on the floor.
The pedestal is square frame structure in one of the embodiments,.
The middle part of the pedestal is equipped with reinforcing rib in one of the embodiments,.
The pedestal is equipped with support wheel group in one of the embodiments, and the crawler belt wraps up the support wheel group.
The support wheel group includes multiple idler wheels being successively intervally arranged in the horizontal direction in one of the embodiments,
The medial surface of the wheel face and the crawler belt of each idler wheel supports.
The rotation axis of the free shaft is parallel to the horizontal plane in one of the embodiments, and the unidirectional shaft turns
Moving axis is parallel to the horizontal plane.
A kind of parking blocking mechanism of the invention takes appropriate measures on extraneous parking blocking mechanism, realizes back
Present the release of resistance, on the one hand, reduce many and diverse operating procedure for having experience driver, on the other hand, reduce new hand driver's
Maloperation is damaged to vehicle bring.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the schematic diagram that the parking of automobile of traditional approach is put in storage；
Fig. 2 is the structure chart of the parking blocking mechanism of one embodiment of the invention；
Fig. 3 is the plan view of the feedback drag release gear of parking blocking mechanism shown in Fig. 2；
Fig. 4 is the perspective view of the feedback drag release gear of parking blocking mechanism shown in Fig. 2；
Fig. 5 is the exploded view of the feedback drag release gear of parking blocking mechanism shown in Fig. 4；
Fig. 6 is the Local map of feedback drag release gear shown in fig. 5；
Fig. 7 is enlarged drawing of the Fig. 6 at A；
Fig. 8 is cross-sectional view of the Fig. 3 along line A-A；
Fig. 9 is the active state figure of wheel and parking blocking mechanism when vehicle parking is put in storage；
Figure 10 is the partial structurtes active state figure of parking blocking mechanism when vehicle parking shown in Fig. 9 is put in storage；
The active state figure of wheel and parking blocking mechanism when Figure 11 is vehicle outbound；
The partial structurtes active state figure of parking blocking mechanism when Figure 12 is vehicle outbound shown in Figure 11；
Figure 13 is the active state figure that wheel hits parking blocking mechanism after fixed bar when vehicle parking is put in storage；
Wheel hits the part of the parking blocking mechanism after fixed bar when Figure 14 is the storage of vehicle parking shown in Figure 13
Structure movement state diagram.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
As shown in Fig. 2, a kind of parking blocking mechanism 40, comprising: floor 41, fixed bar 42, feedback resistance release dress
Set 43.
Fixed bar 42 is fixed on floor 41, and feedback drag release gear 43 is installed on floor 41.In this implementation
In example, floor 41 has smooth plate face 41a (as shown in Figure 2), and fixed bar 42 is cylinder rod-like structure, fixed type block
Bar 42 is screwed on the plate face 41a on floor 41, to realize the fixed installation of fixed bar 42.Thus may be used
Know, fixed bar 42 is on the plate face 41a for protrude from floor 41
Also referring to Fig. 3, Fig. 4 and Fig. 5, specifically, feedback drag release gear 43 includes: pedestal 100, free shaft
200, unidirectional shaft 300, crawler belt 400.Free shaft 200 and the unidirectional rotation of shaft 300 are set on pedestal 100, free shaft 200
The rotation axis of rotation axis and unidirectional shaft 300 be parallel to each other, free shaft 200 is spaced apart from each other setting with unidirectional shaft 300.Into
One step, the rotation axis of free shaft 200 is parallel to the horizontal plane, and the rotation axis of unidirectional shaft 300 is parallel to the horizontal plane.
Crawler belt 400 is end to end to be surrounded in free shaft 200 and unidirectional shaft 300.In the present embodiment, floor 41
Installation groove (not shown) is offered on plate face 41a, feedback drag release gear 43 is contained in installation groove, crawler belt 400
Transmission plane is concordant with the plate face 41a on floor 41, it follows that feedback drag release gear 43 is that entirety is contained in installation groove
It is interior, in this way, can be so that the transmission plane of crawler belt 400 and the plate face 41a on floor 41 be concordant.
It is noted that offering installation groove on the plate face 41a on floor 41, feedback drag release gear 43 can be complete
It is contained in installation groove entirely, also, the transmission plane of crawler belt 400 is concordant with the plate face 41a on floor 41, it is known that, crawler belt 400 will pacify
The notch of dress groove covers, and extraneous sundries can be effectively prevented and fall into installation groove.
Further, pedestal 100 is square frame structure, and the middle part of pedestal 100 is equipped with reinforcing rib 110 (such as Fig. 5 institute
Show), pedestal 100 is equipped with support wheel group 120 (as shown in Figure 6), and crawler belt 400 wraps up support wheel group 120, by the way that reinforcing rib is arranged
110 can be improved the structural strength of entire pedestal 100, and be provided with support wheel group 120, and the crushing resistance of crawler belt 400 can be improved
With transmission smoothness.In the present embodiment, support wheel group 120 includes multiple idler wheels being successively intervally arranged in the horizontal direction, often
The wheel face of one idler wheel and the medial surface of crawler belt 400 support.
As shown in fig. 6, the both ends of free shaft 200 are equipped with first gear 210, first gear 210 is engaged with crawler belt 400；
The both ends of unidirectional shaft 300 are equipped with second gear 310, and second gear 310 is engaged with crawler belt 400.
As shown in Figures 7 and 8, fixing sleeve is connected to ratchet 500 on the axis body of unidirectional shaft 300, rotates and is equipped on pedestal 100
One end of one-way check piece 600, one-way check piece 600 is pressed on the wheel face of ratchet 500.
Here, to be illustrated: if vehicle is to belong to front drive vehicle (i.e. front-wheel offer driving force), vehicle
During parking, it is necessary to which contacting the front-wheel of vehicle with feedback drag release gear 43, (such as vehicle passes through
The mode of straight trip is opened in parking stall, so that front-wheel is contacted with feedback drag release gear 43), it is just able to achieve feedback resistance in this way
The release of power；If vehicle is drive after belonging to (i.e. rear-wheel offer driving force), vehicle just needs during parking
The rear-wheel of vehicle is contacted with feedback drag release gear 43, and (such as vehicle is opened by way of reversing into parking stall
In, so that rear-wheel is contacted with feedback drag release gear 43), it is just able to achieve the release of feedback resistance in this way；If vehicle is
Belong to 4-wheel driven car (i.e. four wheels all provide driving force) and feedback resistance is not achieved then this parking blocking mechanism 40 is then not suitable for
The purpose of release.
In the following, being illustrated the working principle of the parking blocking mechanism 40 of above structure (here, lifting with front drive vehicle
Example explanation):
As shown in FIG. 9 and 10, during front drive vehicle stops and is put in storage, front drive vehicle is advanced in a manner of keeping straight on, currently
When the front-wheel 11 driven touches crawler belt 400, due to front-drive, front-wheel will drive the rotation of crawler belt 400, crawler belt 400 and then band
Dynamic free shaft 200 and unidirectional shaft 300 rotate, at this point, since the ratchet 500 in unidirectional shaft 300 is not by one-way check piece
600 constraint, crawler belt 400 can make free translatory movement, and then, slipping phenomenon will occur for front-wheel, in this way, front-wheel and solid
Just " feedback resistance " will not be generated between fixed pattern bar 42；When driver perceives vehicle slip, it was demonstrated that vehicle has stopped
In place, it can stop working and leave；
As shown in FIG. 11 and 12, when the above-mentioned front drive vehicle parked needs outbound, side of the front drive vehicle to move backward
Formula is left, and the meeting opposite direction rotation of front-wheel 11 of front drive vehicle, front-wheel can apply the active force of an opposite direction to crawler belt 400, at this point,
Since the ratchet 500 in unidirectional shaft 300 is unable to opposite direction rotation by the constraint of one-way check piece 600, in this way, crawler belt
400 can be also unable to opposite direction rotation indirectly by second gear 310 by the constraint of unidirectional shaft 300, and then, front-wheel is just not
Slipping phenomenon can occur, vehicle can normally sail out of parking stall.
It should also be noted that being especially provided with and feedback drag release gear on parking blocking mechanism 40 of the invention
The fixed bar 42 of 43 cooperations, further ensures stabilization, reliability of the vehicle in parking period.Specific explanations illustrate such as
Under:
As shown in FIG. 13 and 14, during front drive vehicle stops and is put in storage, front drive vehicle is advanced in a manner of keeping straight on, before this
It drives that feedback drag release gear 43 may be crossed due to excessive velocities and quickly, so that the front-wheel of front drive vehicle
11 impinge upon on fixed bar 42 (at this point, driver perceives shock can slam brake in time), the fixed meeting pair of bar 42
The front-wheel of front drive vehicle is stopped, and then, the fixed meeting of bar 42 forms a reaction force to the front-wheel of front drive vehicle, this anti-work
It firmly acts on the front-wheel of front drive vehicle, front-wheel can also apply a reaction force to crawler belt 400, at this point, due to list accordingly
For ratchet 500 in shaft 300 not by the constraint of one-way check piece 600, crawler belt 400 can make free translatory movement, so that
The front-wheel opposite direction of front drive vehicle translates, generated between front-wheel and fixed bar 42 " to return after front-wheel translates a distance
Feedback resistance " will be released.
It follows that can achieve following both sides technical effect: on the one hand, can by the way that fixed bar 42 is arranged
Stopped with the tire of the vehicle to parking storage, prevents vehicle offside；On the other hand, fixed bar 42 provides one instead
Active force to vehicle tire, under the cooperation of feedback drag release gear 43, " feedback resistance " caused by release.
A kind of parking blocking mechanism of the invention takes appropriate measures on extraneous parking blocking mechanism, realizes back
Present the release of resistance, on the one hand, reduce many and diverse operating procedure for having experience driver, on the other hand, reduce new hand driver's
Maloperation is damaged to vehicle bring.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of parking blocking mechanism characterized by comprising floor, fixed bar, feedback drag release gear；It is described
Fixed bar is fixed on the floor, and the feedback drag release gear is installed on the floor；
The drag release gear includes: pedestal, free shaft, unidirectional shaft, crawler belt；The free shaft and described unidirectional turn
Axis rotation is set on the pedestal, and the rotation axis of the free shaft and the rotation axis of the unidirectional shaft are parallel to each other, described
Free shaft and the unidirectional shaft are spaced apart from each other setting；The crawler belt is end to end to be surrounded on the free shaft and the list
To in shaft；
The both ends of the free shaft are equipped with first gear, and the first gear is engaged with the crawler belt；The unidirectional shaft
Both ends are equipped with second gear, and the second gear is engaged with the crawler belt；
Fixing sleeve is connected to ratchet on the axis body of the unidirectional shaft, and rotation is equipped with one-way check piece, the blocking on the pedestal
One end of piece is pressed on the wheel face of the ratchet.
2. parking blocking mechanism according to claim 1, which is characterized in that the floor has smooth plate face.
3. parking blocking mechanism according to claim 2, which is characterized in that the fixed bar is the rod-shaped knot of cylinder
Structure.
4. parking blocking mechanism according to claim 3, which is characterized in that the fixed bar be screwed in
In the plate face on the floor.
5. parking blocking mechanism according to claim 2, which is characterized in that it is recessed to offer installation in the plate face on the floor
Slot, the feedback drag release gear are contained in the groove, and the transmission plane of the crawler belt is concordant with the plate face on the floor.
6. parking blocking mechanism according to claim 1, which is characterized in that the pedestal is square frame structure.
7. parking blocking mechanism according to claim 6, which is characterized in that the middle part of the pedestal is equipped with reinforcing rib.
8. parking blocking mechanism according to claim 7, which is characterized in that the pedestal is equipped with support wheel group, described
Crawler belt wraps up the support wheel group.
9. parking blocking mechanism according to claim 8, which is characterized in that the support wheel group includes multiple along level side
To the idler wheel being successively intervally arranged, the medial surface of the wheel face and the crawler belt of each idler wheel is supported.
10. parking blocking mechanism according to claim 1, which is characterized in that the rotation axis and level of the free shaft
Face is parallel, and the rotation axis of the unidirectional shaft is parallel to the horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669610.3A CN110331881A (en) | 2019-07-24 | 2019-07-24 | A kind of parking blocking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910669610.3A CN110331881A (en) | 2019-07-24 | 2019-07-24 | A kind of parking blocking mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110331881A true CN110331881A (en) | 2019-10-15 |
Family
ID=68147262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910669610.3A Pending CN110331881A (en) | 2019-07-24 | 2019-07-24 | A kind of parking blocking mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110331881A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821226A (en) * | 2019-11-29 | 2020-02-21 | 马鞍山市龙腾机电科技有限公司 | Automatic wheel locking device for parking space |
| CN111305106A (en) * | 2020-03-23 | 2020-06-19 | 东北林业大学 | Ratchet drum type parking limiting and anti-collision device |
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|---|---|---|---|---|
| DE2844428A1 (en) * | 1978-10-12 | 1980-04-24 | Hartmut Saleyka | Wall proximity warning indicator assisting garage parking - has wire contacted by bumper to operate warning lamp |
| GB2152983A (en) * | 1984-01-24 | 1985-08-14 | Coal Ind | Vehicle access barrier |
| JPH03191179A (en) * | 1989-12-19 | 1991-08-21 | Teikin Kk | Car stop and parking space |
| CN101230757A (en) * | 2008-02-25 | 2008-07-30 | 缪慰时 | Tower or storage type parking equipment using link plate conveyer |
| CN204475942U (en) * | 2015-02-03 | 2015-07-15 | 陕西隆翔停车设备集团有限公司 | A kind of parking apparatus safety guard |
| US20180299904A1 (en) * | 2015-02-01 | 2018-10-18 | Prosper Technology, Llc | Cyclic Shuffling for Autonomous Vehicle Parking |
-
2019
- 2019-07-24 CN CN201910669610.3A patent/CN110331881A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2844428A1 (en) * | 1978-10-12 | 1980-04-24 | Hartmut Saleyka | Wall proximity warning indicator assisting garage parking - has wire contacted by bumper to operate warning lamp |
| GB2152983A (en) * | 1984-01-24 | 1985-08-14 | Coal Ind | Vehicle access barrier |
| JPH03191179A (en) * | 1989-12-19 | 1991-08-21 | Teikin Kk | Car stop and parking space |
| CN101230757A (en) * | 2008-02-25 | 2008-07-30 | 缪慰时 | Tower or storage type parking equipment using link plate conveyer |
| US20180299904A1 (en) * | 2015-02-01 | 2018-10-18 | Prosper Technology, Llc | Cyclic Shuffling for Autonomous Vehicle Parking |
| CN204475942U (en) * | 2015-02-03 | 2015-07-15 | 陕西隆翔停车设备集团有限公司 | A kind of parking apparatus safety guard |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821226A (en) * | 2019-11-29 | 2020-02-21 | 马鞍山市龙腾机电科技有限公司 | Automatic wheel locking device for parking space |
| CN111305106A (en) * | 2020-03-23 | 2020-06-19 | 东北林业大学 | Ratchet drum type parking limiting and anti-collision device |
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Application publication date: 20191015 |
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