CN109331352A - A kind of novel drop device - Google Patents
A kind of novel drop device Download PDFInfo
- Publication number
- CN109331352A CN109331352A CN201811219348.4A CN201811219348A CN109331352A CN 109331352 A CN109331352 A CN 109331352A CN 201811219348 A CN201811219348 A CN 201811219348A CN 109331352 A CN109331352 A CN 109331352A
- Authority
- CN
- China
- Prior art keywords
- rope sheave
- rope
- bottom plate
- movable
- connecting rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000000694 effects Effects 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
- A62B1/18—Other single parts for rope lowering-devices, e.g. take-up rollers for ropes, devices for shooting ropes
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B29/00—Apparatus for mountaineering
- A63B29/02—Mountain guy-ropes or accessories, e.g. avalanche ropes; Means for indicating the location of accidentally buried, e.g. snow-buried, persons
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B69/00—Training appliances or apparatus for special sports
- A63B69/0048—Training appliances or apparatus for special sports for mountaineering, e.g. climbing-walls, grip elements for climbing-walls
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Pulmonology (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Lowering Means (AREA)
Abstract
The present invention provides a kind of novel drop devices, including, bottom plate, cover board, fixed rope sheave, first connecting rod, operation handle, the fixed rope wheel are sheathed on first connecting rod and are fixedly connected with cover board, and one end that operation handle is connected with first connecting rod is located at the outside of fixed rope sheave one end；It further include movable rope sheave, the second connecting rod, one end and the rotation connection of the second connecting rod and the movable plate on the inside of bottom plate are equipped with lug boss in the tip inside that movable plate is fixedly connected with movable rope sheave with plate outer surface elastic spacing bolt connected vertically；Described activity rope sheave one end is fixedly connected with movable plate the other end surface；In use state, elastic spacing lock bolt bar telescopic segment passes through bottom plate and is located on the inside of bottom plate；Movable rope sheave is between bottom plate and cover board.It is compared compared with similar product, the present invention is easy to use；Because installation winding rope is not necessarily to open main lock and cover board when on drop device, main lock and drop device are avoided, bottom plate and cover board are detached from, to eliminate safe hidden trouble.
Description
Technical field
The present invention relates to outdoor sports instrument field, in particular to it is a kind of in mountain-climbing, climb rocks, climb tree, exploratory heading, fire-fighting, rescue
It helps etc. simple for structure for the instrument of the functions such as braking protection, decline to can be achieved on rope in projects.
Background technique
In exploration, the outdoor activities such as rock-climbing, climb the mountain, climb tree, drop device can be generally used from eminence decline, drop device is set
In on the rope for hanging on eminence, the downslide stablized, speed is controllable is may be implemented in user's holding drop device；Under currently used
Device drops, when being inserted in rope, need to open drop device wherein the cover board of side and it is main lock a door, not only in use in the presence of not
Just, and there are security risks.
Summary of the invention
Place for overcome the deficiencies in the prior art, it is an object of that present invention to provide one kind when being inserted in rope without opening
Cover board and main lock, and at the same time using the drop device of mono-/bis-rope.
To achieve the above object, the technical solution adopted by the present invention are as follows: a kind of novel drop device, including, bottom plate, cover board,
The fixation rope sheave being fixedly arranged between bottom plate and cover board, the first connecting rod that both ends are fixedly connected with bottom plate and cover board respectively, one end
Operation handle between bottom plate and cover board and with first connecting rod rotation connection, the fixed rope wheel are sheathed on the first connection
It is fixedly connected on bar and with cover board, one end that operation handle is connected with first connecting rod is located at the outside of fixed rope sheave one end；
It further include movable rope sheave, the second connecting rod that both ends are fixedly connected with bottom plate and cover board respectively, one end and the second connecting rod rotate
Connection and the movable plate being located on the inside of bottom plate, and plate outer surface elastic spacing bolt connected vertically, in movable plate and activity
The tip inside that rope sheave is fixedly connected is equipped with lug boss；The fixed company in described activity rope sheave one end and movable plate the other end surface
It connects；In use state, elastic spacing lock bolt bar telescopic segment passes through bottom plate and is located on the inside of bottom plate；Movable rope sheave be located at bottom plate and
Between cover board.Before use, if movable rope sheave needs to pull on elastic spacing bolt in the space between bottom plate and cover board
Pull ring or pin the telescopic segment of pin rod, retract pin rod telescopic segment, then rotary moveable plate, is moved to bottom for movable rope sheave
Except space between plate and cover board, it then will hang on one of eminence or two ropes folded in some position, it will
Gap location at folding between the second connecting rod and fixed rope sheave is imported and is placed on movable rope sheave, and rope is divided by drop device
Three sections, respectively fixed section, friction section and free segment, folding are between movable rope sheave and fixed rope sheave with movable rope sheave, admittedly
Determine rope sheave and squeeze contact for friction catch, which is defined as friction section, and friction section is always located in fixed section and freedom
Between section, rope is bypassed after movable rope sheave further around on fixed rope wheel surface, then rope free segment is pulled to rotate movable plate,
Drive activity rope sheave is moved in the space between bottom plate and cover board, is unclamped pull ring or is unclamped the telescopic segment for pinning pin rod, makes
Pin rod telescopic segment retracts, and pin rod telescopic segment is located on the track that movable plate rotates, and pin rod telescopic segment can limit movable plate can only be
It is rotated between bottom plate and cover board, movable rope sheave is prevented voluntarily to be threaded to except the space between bottom plate and cover board.Under this
Drop device belongs to automatic locking type, and also referred to as self-locking drop device passes through operation handle in use, pinning operation handle makes its rotation
Cam above contacts to adjust fixed rope sheave with the gap between movable rope sheave with the lug boss above movable plate, reaches control
The purpose of decrease speed；After unclamping operation handle, under human bady gravitational effect, movable rope sheave is pulled to fixed rope by rope fixed section
Wheel makes fixed rope sheave become smaller with the gap between movable rope sheave, increases fixed rope sheave between movable rope sheave using extrusion principle
The frictional force of rope reaches locking purpose；Main lock one end is hung on the lockhole of bottom plate lower end, the other end and is fixed on user
Safety rope with it is connected, because installation winding rope when on drop device without opening main lock and cover board, can avoid main lock with
Drop device, bottom plate and cover board are detached from, to eliminate safe hidden trouble.
Preferably, the guide pin being fixedly connected with bottom plate is additionally provided on the inside of bottom plate, the guide pin is located at fixed rope sheave
Side.Rope free segment bypasses the gap being then passed through between fixed rope sheave and guide pin behind fixed rope sheave upper surface and stretches downwards
Out.
Preferably, metallic cylinder is also arranged in the second connecting rod, described metallic cylinder one end and cover inner surface are solid
Fixed connection；One end that movable plate is connected with the second connecting rod is located between the end face and baseplate inner surface of metallic cylinder.
It preferably, further include first point of rope partition being radially set on the fixed rope sheave outer wall, first point of rope
Partition is one piece of arc metal plate, and first point of rope partition is welded on fixed rope sheave outer wall or first point of rope partition and fixed rope
Wheel is integrally formed.
Preferably, be radially installed with one piece of second point of rope partition on the movable rope sheave outer wall, described second point restrict every
Plate is welded on movable rope sheave outer wall or second point of rope partition is integrally formed with movable rope sheave.
It is equipped on the inside of the turning end that operation handle is rotatablely connected with first connecting rod integrally formed convex with operation handle
Wheel；In use, rotation process handle, can be such that cam contacts with the lug boss on movable plate.Gap is adjusted, control decline is reached
The purpose of speed and locking.
Advantageous effects: fixed rope sheave and movable rope sheave are set between bottom plate and cover board, need for rope to be set around
When on drop device, without opening cover board, only it need to pull pull ring or push down lock pin bar, retract the telescopic segment on pin rod, then
Rotation movable plate is moved to movable rope sheave except the space between bottom plate and cover board, the folded section of rope can be passed through second
Connecting rod and the gap fixed between rope sheave are simultaneously placed on movable rope sheave, and then, rotary moveable plate or tow free segment make
Movable rope sheave is moved between bottom plate and cover board, and unclamping pull ring or unclamping the power pushed down at the top of pin rod telescopic segment makes telescopic segment bullet
Out, that is, the connection of rope and drop device is completed；Pinning operation handle makes its rotation, passes through cam above operation handle and activity
Lug boss above plate contacts to adjust fixed rope sheave with the gap between movable rope sheave, achievees the purpose that control decrease speed；
After unclamping operation handle, under human bady gravitational effect, movable rope sheave is pulled to fixed rope sheave by rope fixed section, make fixed rope sheave with
Gap between movable rope sheave becomes smaller, and increases fixed rope sheave using extrusion principle and reaches with the frictional force of rope between movable rope sheave
To locking purpose；It is compared compared with similar product, the present invention is easy to use；Because installation winding rope is not necessarily to beat when on drop device
Main lock and cover board are opened, avoids main lock and drop device, bottom plate and cover board are detached from, to eliminate safe hidden trouble.
Detailed description of the invention
Fig. 1 is that operation handle of the invention is located at clockwise extreme position perspective view；
Fig. 2 is that operation handle of the invention is located at anticlockwise extreme position perspective view；
Fig. 3 is perspective view of the invention；
Fig. 4 is another angle perspective view of the invention；
Fig. 5 is the embodiment of the present invention figure.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing with embodiment to this
Invention is described in further detail.
As shown in Figs 1-4, drop device includes, including, bottom plate 1, cover board 2, the fixed rope being fixedly arranged between bottom plate and cover board
Wheel 3, the first connecting rod 4 that both ends are fixedly connected with bottom plate 1 and cover board 2 respectively, one end between bottom plate 1 and cover board 2 and with
The operation handle 5 of first connecting rod rotation connection, the fixed rope sheave 3, which is sheathed on first connecting rod 4 and fixes with cover board 2, to be connected
It connects, one end that operation handle 5 is connected with first connecting rod is located at the outside of one end of fixed rope sheave 3；It further include movable rope sheave
6, the second connecting rod 7 that both ends are fixedly connected with bottom plate and cover board respectively, one end and the second connecting rod are rotatablely connected and are located at bottom
Movable plate 8 on the inside of plate, with plate outer surface elastic spacing bolt 9 connected vertically；It is fixed in movable plate 8 and movable rope sheave 6
The tip inside of connection is equipped with lug boss 801；；Described activity 6 one end of rope sheave is fixedly connected with 8 the other end surface of movable plate.
I.e. lug boss 801 is set on movable plate 8 and the two is integrally formed.
In use state, i.e. drop device is set on rope and is in a falling state, the telescopic segment of the pin rod of elastic spacing bolt 9
901, which pass through bottom plate 1, is located on the inside of bottom plate；Movable rope sheave 6 is between bottom plate 1 and cover board 2.
In the present embodiment, elastic spacing bolt 9 uses commercial product, and the ontology 902 of elastic spacing bolt is using such as
Welding, riveting, silk the modes such as connect and are fixedly arranged on body outer surface, and pull ring 903 is connect with pin rod, and pulling pull ring can make telescopic segment
901 retract in ontology；It is obvious also possible to retract telescopic segment 901 in ontology.
First connecting rod 4, the second connecting rod 7 are all made of the screw rod for having self-locking nut, first connecting rod 4, second
One end that connecting rod 7 is equipped with fixture nut is connect with cover board 2, the other end fixed by a nut after the bottom plate 1 or with
Bottom plate riveting；In batch production, first connecting rod 4, the second connecting rod 7 are welded or riveted with cover board 2 and bottom plate 1 respectively.
Fixed 3 one end of rope sheave is fixed on the inner surface of cover board by welding or forging type, it can also be used certainly
He fixes at mode.Movable 6 one end of rope sheave is equally fixed on movable plate 8 by welding.
In order to be oriented to rope free segment, the guide pin 11 being fixedly connected with bottom plate, institute are additionally provided on the inside of bottom plate 1
State the side that guide pin is located at fixed rope sheave 3.Rope free segment bypass be then passed through behind fixed 3 upper surface of rope sheave fixed rope sheave 3 with
Gap between guide pin 11 extends downwardly.Guide pin 11 has the metallic rod of locking cap using an one end, and the other end passes through
It is riveted after bottom plate 1 with bottom plate；Or 11 other end of guide pin is fixed by a self-locking nut 16 and bottom plate 1 after bottom plate 1
Connection.
Metallic cylinder 12 is also arranged in the second connecting rod 7, described 12 one end of metallic cylinder is fixed with 2 inner surface of cover board
Connection；One end that movable plate 8 is connected with the second connecting rod 7 is located between 1 inner surface of an end face and bottom plate of metallic cylinder 12.
It is equipped on the inside of the turning end that operation handle 5 is rotatablely connected with first connecting rod 4 integrally formed with operation handle 5
Cam 501.
If, in order to avoid two rope runs crosswises are wound, being radially provided with the along fixed rope sheave outer wall using two ropes
One point of rope partition 10, first point of rope partition 10 are one piece of arc metal plate.First point of rope partition 10 is welded in fixed rope sheave 3
On, alternatively, first point of rope partition 10 and fixed rope sheave 3 are integrally formed by techniques such as castings.
Based on same reason, it is radially installed with one piece of second point of rope partition 13 on activity rope sheave 6 outer wall, described the
Two points of rope partitions are one piece of arc metal plate.Second point of rope partition is welded on movable 6 outer wall of rope sheave or second point of rope
Partition and movable rope sheave 6 are integrally formed by techniques such as castings.
The rotation connection mentioned in this document refers to that a part can be connected and inseparable with respect to another part,
The two can relative rotation；Such as, first connecting rod and operation handle 5 are rotatablely connected, can be opposite when referring to that operation handle 5 applies external force
First connecting rod rotation.
As shown in figure 5, before use, if movable rope sheave 6 needs to pull bullet in the space between bottom plate 1 and cover board 2
Property limit bolt on pull ring 903, or directly press telescopic segment 901, retract pin rod telescopic segment 901, then rotary moveable
Movable rope sheave 6 is moved to except the space between bottom plate 1 and cover board 2 by plate 8, then will hang on one or two of eminence
Root rope 14 is folded in some position, and gap location of the friction section 1401 between the second connecting rod 7 and fixed rope sheave 3 is imported
And be placed on movable rope sheave 6, rope is divided into three sections, respectively fixed section 1402, free segment 1403 and friction section by drop device, rope
Rope bypasses after movable rope sheave 6 further around on fixed 3 surface of rope sheave.If using two rope 14, the friction section of two ropes
1401 are located at second point of 13 two sides of rope partition；The free segment 1403 of two ropes is then divided into 10 liang of partition of first point of rope
Side.Then rope free segment 1403 is pulled to rotate movable plate 8, drive activity rope sheave 6 is moved between bottom plate 1 and cover board 2
In space, pull ring 903 is unclamped, pin rod telescopic segment 901 pops up, and pin rod telescopic segment is located on the track of the rotation of movable plate 8, and pin rod is stretched
Contracting section, which can limit movable plate 8, to be rotated between bottom plate 1 and cover board 2, and movable rope sheave 6 is prevented voluntarily to be threaded to bottom plate
Except space between cover board.This drop device belongs to automatic locking type, also referred to as self-locking drop device, in use, pinning operation
Handle 5 contacts the cam 501 above operation handle with the lug boss 801 above movable plate 8 to adjust fixed rope sheave 3 with work
Gap between running rope wheel 6 achievees the purpose that control decrease speed and automatic locking, and process is, in use, in human bady gravitational
Under effect, movable rope sheave 6 is pulled to fixed rope sheave 3 by rope fixed section 1402, and herein, movable rope sheave 6 drives movable plate 8 counterclockwise
Rotation makes fixed rope sheave 3 become smaller with the gap between movable rope sheave 6, is located at fixed rope sheave 3 with part between movable rope sheave 6
The frictional force that rope is subject to becomes larger, so that decrease speed is slack-off, conversely, applying pressure in operation handle 5, pushes away cam 501
Lug boss 801 on dynamic movable plate, and then movable plate rotation is pushed, at this point, movable plate then rotates clockwise and drives movable rope
6 rotation of wheel, makes fixed rope sheave 3 become larger with the gap between movable rope sheave 6, the frictional force that rope is subject to becomes smaller, thus lower reduction of speed
Degree increases；It should be noted that the direction of rotation of movable plate 8 can be according to its mounting means difference during adjusting decrease speed
And it is different.After unclamping operation handle 5, under human bady gravitational effect, movable rope sheave 6 is pulled to fixation by rope fixed section 1402
Rope sheave 3 makes fixed rope sheave 3 become smaller with the gap between movable rope sheave 6, increases fixed rope sheave with movable rope sheave using extrusion principle
Between the frictional force of rope reach locking purpose；15 one end of main lock are hung on the lockhole 101 of bottom plate lower end, the other end and fixation
Safety rope on the user's body is connected, and because winding rope 14 is not necessarily to open main lock 15 when on drop device, can avoid main lock
15 are detached from bottom plate 1, to eliminate safe hidden trouble.
Although depicting the present invention by embodiment, it will be appreciated by the skilled addressee that the present invention there are many deformation and
Variation is without departing from spirit of the invention, it is desirable to which the attached claims include these deformations and change without departing from of the invention
Spirit.
Claims (6)
1. a kind of novel drop device, including, bottom plate, cover board, the fixation rope sheave being fixedly arranged between bottom plate and cover board, both ends respectively with
The first connecting rod that bottom plate is fixedly connected with cover board, what one end was rotatablely connected between bottom plate and cover board and with first connecting rod
Operation handle, the fixed rope wheel are sheathed on first connecting rod and are fixedly connected with cover board, operation handle and first connecting rod
The one end being connected is located at the outside of one end of fixed rope sheave；It is characterized in that, further include movable rope sheave, both ends respectively with bottom
The movable plate that the second connecting rod that plate is fixedly connected with cover board, one end and the second connecting rod are rotatablely connected and are located on the inside of bottom plate,
With plate outer surface elastic spacing bolt connected vertically；It is equipped in the tip inside that movable plate is fixedly connected with movable rope sheave convex
The portion of rising；Described activity rope sheave one end is fixedly connected with movable plate the other end surface；In use state, elastic spacing lock bolt
The telescopic segment of bar passes through bottom plate and is located on the inside of bottom plate；Movable rope sheave is between bottom plate and cover board.
2. a kind of novel drop device as described in claim 1, which is characterized in that be additionally provided on the inside of bottom plate and the fixed company of bottom plate
The guide pin connect, the guide pin are located at the side of fixed rope sheave.
3. a kind of novel drop device as described in claim 1, which is characterized in that be also arranged with round metal in the second connecting rod
Cylinder, described metallic cylinder one end is fixedly connected with cover inner surface；One end that movable plate is connected with the second connecting rod is located at gold
Between the end face and baseplate inner surface for belonging to cylinder.
4. a kind of novel drop device as described in claim 1, which is characterized in that further include radially being set to the fixed rope
First point of rope partition on outer wall is taken turns, first point of rope partition is one piece of arc metal plate, and first point of rope partition is welded in solid
Determine on rope sheave outer wall or first point of rope partition is integrally formed with fixed rope sheave.
5. a kind of novel drop device as described in claim 1, which is characterized in that radially fixed on the activity rope sheave outer wall
There is one piece of second point of rope partition, second point of rope partition is welded on movable rope sheave outer wall or second point of rope partition and activity
Rope sheave is integrally formed.
6. a kind of novel drop device as described in claim 1, which is characterized in that connect in operation handle and first connecting rod rotation
It is equipped with and the integrally formed cam of operation handle on the inside of the turning end connect；In use, rotation process handle, can make cam and protrusion
Portion's contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219348.4A CN109331352A (en) | 2018-10-19 | 2018-10-19 | A kind of novel drop device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219348.4A CN109331352A (en) | 2018-10-19 | 2018-10-19 | A kind of novel drop device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109331352A true CN109331352A (en) | 2019-02-15 |
Family
ID=65310252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811219348.4A Pending CN109331352A (en) | 2018-10-19 | 2018-10-19 | A kind of novel drop device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109331352A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5850893A (en) * | 1995-11-28 | 1998-12-22 | Zedel | Self-locking descender for a rope with an operating lever |
| US20030075392A1 (en) * | 1999-12-15 | 2003-04-24 | Boris Rogelja | Descender with two-way locking lever |
| US20130219671A1 (en) * | 2012-02-23 | 2013-08-29 | Renaud Hutin | Rope adjuster with fast rope replacement device |
| US20180021602A1 (en) * | 2015-02-17 | 2018-01-25 | Boris Rogelja | Descender |
| CN209173254U (en) * | 2018-10-19 | 2019-07-30 | 叶雄辉 | A kind of novel drop device |
-
2018
- 2018-10-19 CN CN201811219348.4A patent/CN109331352A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5850893A (en) * | 1995-11-28 | 1998-12-22 | Zedel | Self-locking descender for a rope with an operating lever |
| US20030075392A1 (en) * | 1999-12-15 | 2003-04-24 | Boris Rogelja | Descender with two-way locking lever |
| US20130219671A1 (en) * | 2012-02-23 | 2013-08-29 | Renaud Hutin | Rope adjuster with fast rope replacement device |
| US20180021602A1 (en) * | 2015-02-17 | 2018-01-25 | Boris Rogelja | Descender |
| CN209173254U (en) * | 2018-10-19 | 2019-07-30 | 叶雄辉 | A kind of novel drop device |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20190215 |