CN1130161C - Electric dust cleaner - Google Patents
Electric dust cleaner Download PDFInfo
- Publication number
- CN1130161C CN1130161C CN99101035A CN99101035A CN1130161C CN 1130161 C CN1130161 C CN 1130161C CN 99101035 A CN99101035 A CN 99101035A CN 99101035 A CN99101035 A CN 99101035A CN 1130161 C CN1130161 C CN 1130161C
- Authority
- CN
- China
- Prior art keywords
- mentioned
- dust collector
- tube connector
- suction hose
- electric dust
- 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.)
- Expired - Fee Related
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/24—Hoses or pipes; Hose or pipe couplings
- A47L9/242—Hose or pipe couplings
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
- A47L5/362—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back of the horizontal type, e.g. canister or sledge type
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0009—Storing devices ; Supports, stands or holders
- A47L9/0018—Storing devices ; Supports, stands or holders integrated in or removably mounted upon the suction cleaner for storing parts of said suction cleaner
- A47L9/0036—Storing devices ; Supports, stands or holders integrated in or removably mounted upon the suction cleaner for storing parts of said suction cleaner specially adapted for holding the suction hose
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electric Vacuum Cleaner (AREA)
Abstract
An electric dust cleaner may prevent breakage of a terminal generated when a cleaner main body is taken up by grasping a grip of a connecting part from occurring. A rib 22 is projected on the outer peripheral face of a connecting pipe 12 of a connecting part 4 and a recessed part 23 fitting into a rib 22 is formed on the inner peripheral race of a hose cover 15a,15b and a terminal for connecting electrically a wiring provided on a suction hose 3 with a cleaner main body 1 is arranged at a position on the opposite side to the rib 22 and the axial center of the connecting pipe 22 on the side face of the connecting pipe 12 and in the neighborhood of the nail 17a engaging suction port 6 of a cleaner main body 1.
Description
The present invention relates to electric dust collector.Know clearly it, relate to the electric dust collector that can stand type folding and unfolding (erectting folding and unfolding) compactly to call in the following text.
In the past, as erectting the electric dust collector of folding and unfolding compactly various electric dust collectors were proposed once in narrow place.
As shown in figure 13, the electric dust collector that Japanese kokai publication hei 7-39485 communique is put down in writing comprises: body of dust collector 50, and its place ahead contains dust storage chamber, and the rear contains electric blowing machine etc.; Suction hose 51 is connected in the place ahead of this body of dust collector 50 removably; Suction line 52 is connected on this suction hose 51; And suction member 53.And 56 is fastener, is arranged at suction line 52, in order to the recess 57 in following the place ahead of being sticked in body of dust collector 50.
The connecting portion 54 of 51 pairs of body of dust collector 50 of above-mentioned suction hose comprises: the tube connector of tubular (not shown), be fixedly arranged on side face front portion outside this tube connector suction hose 51 the end and by a pair of soft tube cap 58 of the portion that sets firmly of the end of this suction hose 51 of left and right sides clamping and tube connector, and handle 55 is integrally formed at the top of this soft tube cap 58.By this handle 55, and after finishing indoor cleaning, can make body of dust collector 50 become orthostatism, or suction line 52 is being installed on the state carrying down of body of dust collector 50.
And for example shown in Figure 14, the electric dust collector that Japanese kokai publication hei 6-319667 communique is put down in writing comprises: body of dust collector 60, suction hose 61, suction line 62 and suck member 63, and be provided with that carrying and installation has above-mentioned suction hose 61 and handle 65 when making it state body of dust collector 60 on upright in the connecting portion 64 to body of dust collector 60 of above-mentioned suction hose 61.Again, 67 for card ends member, is located at suction line 62, in order to this suction line 62 is limited to body of dust collector 60.
Moreover, be equipped with a pair of fastener 68,69 of the suction inlet 66 that is sticked in above-mentioned body of dust collector 60 in the leading section of connecting portion 64.
As shown in figure 15, fastener 68,69 is by spring 68a, 69a, and only is sticked on the above-mentioned suction inlet 66 with claw 68b, 69b via the card towards the outside pushing.By these fasteners 68,69, and when the dust catcher of conveying upending folding and unfolding, above-mentioned body of dust collector 60 can not come off by connecting portion 64 because of deadweight.Again,, also can depress the taking off button 68c, 69c of fastener 68,69 and remove engaging of claw 68b, 69b and suction inlet 66, after this pull out connecting portion 64 by suction inlet 66 in the occasion that suction hose 61 is taken off by body of dust collector 60.
Existing electric dust collector is being provided with power switch (not shown) in order to handle portion 70 grades of operating suction line shown in Figure 14 62.Power switch is connected electrically on the distribution (not shown) of being located at suction hose 61.This distribution is connected electrically on the body of dust collector 60 via the terminal that is equipped on connecting portion 64 (not shown).
Yet, existing electric dust collector is located at the handle of connecting portion in gripping, and make body of dust collector become orthostatism, or the following occasion of carrying of the state that suction line is installed on body of dust collector, owing to apply crooked loading in connecting portion, reaction force that simultaneously should the bending loading imposes on the terminal of connecting portion, and causes problems such as terminal breakage.
The present invention's purpose is in order to address the above problem, and electric dust collector is provided, the breakage of the terminal that is produced in the time of can preventing to carry body of dust collector at the handle that grips connecting portion.
As Figure 13 and shown in Figure 14, existing electric dust collector is after indoor cleaning, and when making body of dust collector 50,60 become under the state of orthostatism folding and unfolding, suction hose becomes obstruction, and then causes the situation that is difficult for the gap of folding and unfolding in the corner of closet or furniture etc.If be positioned over indoorly, then not only specious poor, and also there is the part of health to touch suction hose and anxiety that dust catcher is fallen down.
Electric dust collector of the present invention comprises: body of dust collector; Suction hose is connected the suction inlet of this body of dust collector removably; And suction line, connect this suction hose and suck member; It is characterized in that: the connecting portion to body of dust collector of above-mentioned suction hose has the tube connector that suction hose is installed and covers the soft tube cap of the portion that sets firmly of this tube connector and suction hose, and the periphery in this soft tube cap forms jug, is provided with the claw of the suction inlet that is sticked in body of dust collector removably simultaneously in the periphery of above-mentioned tube connector; And be formed with the mutual holding section that engages in above-mentioned tube connector and soft tube cap, simultaneously in above-mentioned tube connector, with respect to the axle center of above-mentioned tube connector and at the opposition side of holding section, and near position above-mentioned claw is equipped with the terminal that is connected to body of dust collector in order to the wired electric that will be located at above-mentioned suction hose.
Preferably at least one pair of is configured to clip above-mentioned handle and becomes symmetry substantially above-mentioned claw.
Preferably many of above-mentioned terminals, and be configured to respect to the orientation of above-mentioned at least one pair of claw and substantially orthogonal direction arrange.
Above-mentioned handle is preferably grip portions towards the arched door type that extends with the direction of the axis quadrature of above-mentioned tube connector.
Above-mentioned handle is preferably the T font that grip portions extends towards the axis orthogonal direction with above-mentioned tube connector.
Again, electric dust collector of the present invention comprises: body of dust collector; Suction hose is connected to the suction inlet of this body of dust collector removably; And suction line, connect this suction hose and suck member; It is characterized in that: in this suction line be provided with have be sticked in be formed on above-mentioned body of dust collector by the retaining member of the fastener of fastener, the connecting portion to body of dust collector in above-mentioned suction hose is formed with handle simultaneously, and is formed with the maintaining part that keeps suction hose in this handle.
Above-mentioned maintaining part is preferably the maintenance pawl.
Brief description of drawings is as follows:
The front view of Fig. 1 during for the setting folding and unfolding of the embodiment that shows electric dust collector of the present invention;
Fig. 2 is a view of being observed the connecting portion of Fig. 1 by front;
Fig. 3 is the III-III line profile of the connecting portion of Fig. 2;
Fig. 4 is the IV-IV line profile of the connecting portion of Fig. 3;
Fig. 5 is a view of being observed the tube connector of Fig. 2 by the arrow A direction;
Fig. 6 is the view by the connecting portion with T font handle of another embodiment of front observation demonstration the present invention's electric dust collector;
Fig. 7 is a view of being observed the connecting portion of Fig. 6 by the arrow B direction;
Fig. 8 is the profilograph on square top after the body of dust collector of Fig. 1;
Fig. 9 is the profilograph of the lid on square top before the body of dust collector of Fig. 1;
Figure 10 is the part enlarged drawing in hole of the lid of Fig. 9;
Figure 11 is the side view of another embodiment of demonstration the present invention's electric dust collector;
Figure 12 is the front view of the electric dust collector of Figure 11;
Figure 13 is for showing the stereogram of one of existing electric dust collector example;
Figure 14 is for showing another routine stereogram of existing electric dust collector;
Figure 15 is the profile of the connecting portion of Figure 14.
Below, with reference to accompanying drawing, describe electric dust collector of the present invention in detail.The front view of Fig. 1 during for the setting folding and unfolding of one of the electric dust collector that shows the present invention embodiment; Fig. 2 is a view of being observed the connecting portion of Fig. 1 by front; Fig. 3 is the III-III line profile of the connecting portion of Fig. 2; Fig. 4 is the IV-IV line profile of the connecting portion of Fig. 3; Fig. 5 is a view of being observed the tube connector of Fig. 2 by the arrow A direction; Fig. 6 is the view of the connecting portion with T font handle of another embodiment of front observation demonstration the present invention's electric dust collector; Fig. 7 is a view of being observed the connecting portion of Fig. 6 by the arrow B direction; Fig. 8 is the profilograph on square top after the body of dust collector of Fig. 1; Fig. 9 is the profilograph of the lid on square top before the body of dust collector of Fig. 1; And Figure 10 is the part enlarged drawing in hole of the lid of Fig. 9.
As shown in Figure 1, the electric dust collector according to one embodiment of the invention comprises: body of dust collector 1, suction line 2 and suction hose 3.Be provided with handle 5 at the connecting portion 4 to body of dust collector 1 of suction hose 3 in order to the electric dust collector of conveying upending folding and unfolding state.
Keep electric blowing machine and dust collecting part (all not shown) in the body of dust collector 1, and accommodation bag is installed removably in this dust collecting part.In the front portion of this body of dust collector 1, have the suction inlet 6 that is communicated to above-mentioned dust collecting part, and be connected with the connecting portion 4 of above-mentioned suction hose 3 removably.On the other hand, under body of dust collector 1 in face of the side and below the rear be separately installed with castor 7 and one wheel pairs 8, and make the body of dust collector 1 can be freely mobile on ground etc.And, because the place ahead is formed with recess 15 below body of dust collector 1, thus be sticked in recess 15 by the fastener 10a of the retaining member 10 of being located at suction line 2, and can erect folding and unfolding compactly.
The electric dust collector of present embodiment is provided with power switch (not shown) at handle portion 11.Power switch is electrically connected on the distribution (not shown) of being located at suction hose 3.This distribution is electrically connected to body of dust collector 1 via the terminal 24 of following connecting portion 4.
Shown in Fig. 2～5, the connecting portion 4 of 3 pairs of body of dust collector 1 of above-mentioned suction hose comprises: a pair of soft tube cap 15a, the 15b of the portion that sets firmly 14 of the tube connector 12 of tubular, the end 3a that is fixedly arranged on the above-mentioned suction hose 3 of side face front portion outside this tube connector 12 and left and right sides clamping this end 3a and tube connector 12, and as shown in Figure 2, above side face outside this soft tube cap 15a, the 15b, the part 5a that is divided into two parts, the 5b that constitute handle 5 are integrally formed with soft tube cap 15a, 15b respectively.The right half part 5b of the left-half 5a of soft tube cap 15a and handle and soft tube cap 15b and handle fixes with two places up and down by screw 16 (with reference to Fig. 1).
Fastener 17a, 17b with the pawl 18 that can engage with above-mentioned body of dust collector 1 are located on the outer peripheral face of above-mentioned tube connector 12.Fastener 17a, 17b comprise: claw 18, with this claw 18 integrally formed take off button 19, in order to this claw 18 with take off coil spring 20 and the leaf spring 21 of button 19 towards the outside pushing.Leaf spring 21 and tube connector 12, claw 18 and to take off button 19 integrally formed.
Be equipped with flank 22 at the outer peripheral face of tube connector 12, and be formed with recess 23, and constitute flank 22 and recess 23 mutual chimeric holding sections in the inner peripheral surface of above-mentioned soft tube cap 15a.Chimeric by flank 22 and recess 23, and handle 5 and soft tube cap 15a, 15b are installed in the mode that can not rotate with respect to tube connector 12.By this, relative the departing from about reaching up and down that can suppress handle 5 and 12 of tube connectors, and stable can keep carrying the time.
Again, as shown in Figure 5, side in tube connector 12, with respect to the opposition side of above-mentioned flank 22 in the axle center of tube connector 12, simultaneously near above-mentioned claw 18, with this claw 18 be the center and with the position of above-mentioned flank 22 opposition sides, be equipped with the terminal 24 that is electrically connected to body of dust collector 1 in order to the distribution that will be located at above-mentioned suction hose 3.
In the electric dust collector that is as above constituted, the setting folding and unfolding state that makes body of dust collector 1 become orthostatism in holds handle 5 or suction line 2 is installed on body of dust collector 1 is the occasion of carrying down, the power of drawing handle 5 and soft tube cap 15a, 15b is sent to tube connector 12 via the flank 22 of the recess 23 that is embedded in soft tube cap 15a, and applies crooked loading in tube connector 12.At this moment, because terminal 24 is with respect to flank 22 and at both opposition sides of tube connector 12 and claw 18, and is close to the claw 18 of the fulcrum that becomes crooked loading and disposes, so the reaction force of crooked loading does not put on terminal 24.Therefore, can prevent the breakage of terminal 24.
As long as the axle center that claw 18 clips tube connector 12 is being provided with at least one pair of to being referred to as the position, thereby it is just passable to make tube connector 12 joltily not be connected to body of dust collector 1.
As shown in Figure 2, if at least one pair of claw 18 clips above-mentioned handle 5 and become horizontal arrangement symmetrically substantially, then can eliminate the shaking of left and right directions of Fig. 2.In this occasion, if a plurality of terminals 24 are configured to be arranged in vertical direction (with respect to the orientation of above-mentioned at least one pair of claw 18 direction of quadrature substantially), then because each terminal 24 can be crooked to left and right direction, so more can prevent the breakage of terminal.
Again, also can adopt grip portions 25a shown in Fig. 6～7 form towards with the handle 25 of the T font of direction extensions of the axis quadrature of tube connector 12, to replace the handle 5 of arched door type, so can be easily upright, and the weight balancing when carrying is good.
The lid 25 of the dust storage chamber of body of dust collector 1 shown in Figure 1 can open and close around center of rotation O.Speech in the upper body 26 of body of dust collector 1, is equipped with the axle 27 of semi-circular shape as shown in Figure 8 in both sides along the width of body of dust collector 1 particularly.On the other hand, shown in Fig. 9～10,, be equipped with wrist 28 towards the rear in the both sides, rear portion of lid 25.Be provided with the bearing portion 30 that is embedded in above-mentioned axle 27 with the hole 29 that is 3/4ths circular cross sections in the inboard of this wrist 28.And Fig. 8～10 and Fig. 1 similarly show the center of rotation O of lid 25.
Be embedded under the state in the hole 29 that is 3/4ths circular cross sections at semicircular axle 27, lid 25 can not shake, and can open and close swimmingly.
And when opening 90 ° owing to lid 25, the internal face 31 (with reference to Figure 10) of bearing portion 30 presses on axle 27, so can limit lid 25 it is not opened more than 90 °.Therefore, because need be in order to the stop member of angle of release of restriction lid, so made the simple shape of body of dust collector.Its result can lower the expense of the mould of using in order to making manufacturing body of dust collector, and not damage exterior quality.
Figure 11 and Figure 12 show another embodiment of the present invention, and Figure 11 is the side view of another embodiment of demonstration the present invention's electric dust collector; Figure 12 is the front view of the electric dust collector of Figure 12.And part same as the previously described embodiments is put on same-sign, to omit its explanation.
As shown in figure 11, comprise according to the electric dust collector of another embodiment of the present invention: body of dust collector 1, suction line 2 and suction hose 3, and have maintaining part C in order to prevent that above-mentioned suction hose 3 is loose.
Above-mentioned maintaining part C is formed at the carrying handle 5 of being located at connecting portion 4.In present embodiment,, then be not particularly limited in this structure as long as can prevent, lower the loose of above-mentioned suction hose 3, and can suitably select, for example, be formed with flexible pipe fitting portion 31 in the bottom of handle 5, and form a pair of maintenance pawl 32, suction hose 3 is remained in this fitting portion 31.And the semicircle arcuation that the internal face of these fitting portions 31 and maintenance pawl 32 preferably becomes and suction hose 3 outer shape are identical substantially.Owing to form this kind semicircle arcuation, and make the part of the suction hose 3 that is bent into U word shape can utilize the elasticity of maintenance pawl 32 to push, and fitting portion 31 dismounting relatively swimmingly.
Present embodiment is for being provided with at the handle of attached member by fitting portion and suction hose holding device that maintaining part constituted, thus can reduce number of parts and procedure of processing, and can suppress the increase of production cost.
According to the present invention, do not put on the position configuration terminal that influences of the crooked loading of connecting portion when carrying body of dust collector, and can be prevented the breakage of terminal in the handle that grips connecting portion.
And according to the present invention, remain in the suction hose holding device, and can prevent terminating in the loose of the suction hose of erectting the folding and unfolding state, so can erect folding and unfolding compactly by a part with suction hose.In indoor, outward appearance is clean and tidy again, and appearance is also attractive in appearance.The present invention for the occasion of erectting folding and unfolding under the state that shrinks at telescopic suction line, can prevent the loose of above-mentioned suction hose, and produce effect especially.
Claims (5)
1. electric dust collector comprises:
Body of dust collector;
Suction hose is connected to the suction inlet of this body of dust collector removably; And
Suction line connects this suction hose and sucks member;
It is characterized in that:
The connecting portion to body of dust collector of above-mentioned suction hose has the tube connector that suction hose is installed and covers the soft tube cap of the portion that sets firmly of this tube connector and suction hose, and the periphery in this soft tube cap forms jug, is provided with the claw of the suction inlet that is sticked in body of dust collector removably simultaneously in the periphery of above-mentioned tube connector; And
Be formed with the mutual holding section that engages at above-mentioned tube connector and soft tube cap, simultaneously in above-mentioned tube connector, with respect to the axle center of above-mentioned tube connector and at the opposition side of holding section, and near position above-mentioned claw is equipped with the terminal that is electrically connected to body of dust collector in order to the distribution that will be located at above-mentioned suction hose.
2. electric dust collector as claimed in claim 1, wherein above-mentioned claw is at least one pair of, is configured to clip above-mentioned handle and becomes symmetry substantially.
3. electric dust collector as claimed in claim 2, wherein above-mentioned terminal arrangement has a plurality of, and arranges along the direction of quadrature with respect to the orientation of above-mentioned at least one pair of claw and substantially.
4. as claim 1,2 or 3 described electric dust collectors, wherein above-mentioned handle is the arched door type that grip portions extends towards the axis orthogonal direction with above-mentioned tube connector.
5. as claim 1,2 or 3 described electric dust collectors, wherein above-mentioned handle is the T font that grip portions extends towards the axis orthogonal direction with above-mentioned tube connector.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3154/98 | 1998-01-09 | ||
| JP3154/1998 | 1998-01-09 | ||
| JP10003154A JPH11197076A (en) | 1998-01-09 | 1998-01-09 | Vacuum cleaner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1226414A CN1226414A (en) | 1999-08-25 |
| CN1130161C true CN1130161C (en) | 2003-12-10 |
Family
ID=11549446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99101035A Expired - Fee Related CN1130161C (en) | 1998-01-09 | 1999-01-08 | Electric dust cleaner |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH11197076A (en) |
| KR (1) | KR100284243B1 (en) |
| CN (1) | CN1130161C (en) |
| TW (1) | TW399448U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293608A (en) * | 2010-06-22 | 2011-12-28 | 珍巴多工业股份有限公司 | Vertical electric dust collector |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0228153D0 (en) * | 2002-12-03 | 2003-01-08 | Techtronic Ind Co Ltd | Suction cleaners |
| US11259674B2 (en) * | 2016-09-02 | 2022-03-01 | Sharkninja Operating Llc | Hose clip arrangement for use with cleaning device and/or other devices |
-
1998
- 1998-01-09 JP JP10003154A patent/JPH11197076A/en active Pending
- 1998-12-08 TW TW088216512U patent/TW399448U/en not_active IP Right Cessation
- 1998-12-29 KR KR1019980060282A patent/KR100284243B1/en not_active IP Right Cessation
-
1999
- 1999-01-08 CN CN99101035A patent/CN1130161C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293608A (en) * | 2010-06-22 | 2011-12-28 | 珍巴多工业股份有限公司 | Vertical electric dust collector |
| CN102293608B (en) * | 2010-06-22 | 2015-12-02 | 珍巴多工业股份有限公司 | Vertical electric dust collector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11197076A (en) | 1999-07-27 |
| KR100284243B1 (en) | 2001-03-02 |
| TW399448U (en) | 2000-07-21 |
| CN1226414A (en) | 1999-08-25 |
| KR19990066889A (en) | 1999-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |