CN106827903A - It is a kind of can be with the blackboard eraser of automatic dust removing - Google Patents
It is a kind of can be with the blackboard eraser of automatic dust removing Download PDFInfo
- Publication number
- CN106827903A CN106827903A CN201611185585.4A CN201611185585A CN106827903A CN 106827903 A CN106827903 A CN 106827903A CN 201611185585 A CN201611185585 A CN 201611185585A CN 106827903 A CN106827903 A CN 106827903A
- Authority
- CN
- China
- Prior art keywords
- blackboard eraser
- back box
- eraser body
- dust removing
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
The invention discloses it is a kind of can be with the blackboard eraser of automatic dust removing, it is related to teaching aid field, the blackboard eraser includes water tank, water pipe, back box, blackboard eraser body and blow-dry device, blackboard eraser body is fixed at the top of back box, blow-dry device is fixed at the top of blackboard eraser body, one end connection water tank of water pipe, the other end enters in blackboard eraser body through back box, insert at least one sliding bar in back box side, the other end of sliding bar stretches out back box and is detachably connected dust-collecting box, when dust-collecting box is moved by the power in spring direction, the front end face of dust-collecting box is flushed with blackboard eraser body surface；The side of blackboard eraser body is provided with multiple shower nozzles, and blackboard eraser body is provided with shower nozzle side and is removably connected with sponge wiper；Blackboard eraser body also includes cleaning plant, and cleaning plant includes support bar, connecting rod and brush.By the airborne dust problem sprayed water when wiping is reduced with drying function in the present invention, and blackboard eraser surface is cleared up, centralized collection dust, it is ensured that teachers and students are healthy.
Description
Technical field
The present invention relates to teaching aid technical field, more particularly relate to it is a kind of can be with the blackboard eraser of automatic dust removing.
Background technology
Blackboard eraser is the necessary article of classroom teaching, and common blackboard eraser is bristle structure by a housing and below
Can be kicked up when in use many dust into, this blackboard eraser so that Faculty and Students suck dust to lung for a long time, seriously
Influence is healthy, or even can cause disease, and the blackboard eraser cannot be cleared up in time, cause blackboard wiping effect bad..
The content of the invention
The present invention provide it is a kind of can be with the blackboard eraser of automatic dust removing, in can solve the problem that blackboard eraser wiping process in the prior art
Easy airborne dust, and can not clear up in time, cause to wipe the bad problem of blackboard effect.
Specifically, the present invention provide can with the blackboard eraser of automatic dust removing, including：
Blackboard eraser body, blackboard eraser sheet are fixed in water tank, water pipe, back box, blackboard eraser body and blow-dry device, the top of back box
Blow-dry device is fixed at the top of body, and one end connection water tank of water pipe, the other end enters in blackboard eraser body through back box；
At least one sliding bar is inserted in back box side, and with respect to back box slidably, sliding bar stretches into back box to sliding bar
End is connected by spring with the inwall of back box, and the other end of sliding bar stretches out back box and is detachably connected dust-collecting box, dust-collecting box
When being moved by the power in spring direction, the front end face of dust-collecting box is flushed with blackboard eraser body surface；
The side of blackboard eraser body is provided with multiple shower nozzles, and each shower nozzle is connected with the water pipe stretched into blackboard eraser body,
Blackboard eraser body is provided with shower nozzle side and is removably connected with sponge wiper, and sponge wiper is located at the top of dust-collecting box；
Blackboard eraser body also includes cleaning plant, and cleaning plant includes support bar, connecting rod and brush, sponge wiper side
Blackboard eraser body be provided with chute, support bar is limited in chute, and relative chute is slidably, and connecting rod is L-type, connecting rod
Quarter butt one end rotates with the top of support bar and is connected, and connecting rod stock one end is fixedly connected with brush, the length of connecting rod quarter butt
More than 1/2 width of brush.
Preferably, blow-dry device includes heating wire, fan, switch and battery, heating wire, fan, switch and battery
Pass sequentially through wire connection.
Preferably, water inlet is provided with the top of water tank, the side of water tank is provided with snap ring, water pump, water are provided with water tank
The output end of pump is connected with water pipe, and the bottom of water tank is provided with universal wheel, and universal wheel is provided with self-locking structure.
Preferably, blackboard eraser body is provided with handle with respect to the side of sponge wiper, and handle can engage with snap ring.
Preferably, blow-dry device is provided with blowing mouth near sponge wiper side.
Preferably, sliding bar stretches out one end of back box and is provided with screw thread, and sliding bar is connected through the side of dust-collecting box by nut
Connect dust-collecting box.
Preferably, shower nozzle is 3.
Preferably, sponge wiper is connected with blackboard eraser body by VELCRO.
Preferably, supporting bar top is provided with two projections, and connecting rod quarter butt one end is arranged between two projections and with two
It is individual to project through rotating shaft connection.
Preferably, brush includes fixed plate and is fixed on the bristle of fixed plate bottom.
The invention has the advantages that：
The dust-removing blackboard eraser provided in the present invention, rationally, simple structure is sprayed water to blackboard by shower nozzle and solved for global design
, in the problem of the easy airborne dust of blackboard wiping process, the sponge wiper in blackboard eraser body is with blackboard eraser body by magic for blackboard eraser
Patch is bonded, and can facilitate disassembly, cleaning, improves wiping effect, when water spray is wiped, can open blowing device, and the hot blast of blowout has baking
Dry function, is easy to reusing for blackboard；In the complete blackboard of sponge wipe, the ash that falls can be collected into dust-collecting box, sponge brush
After cloth has wiped blackboard, the surface of sponge wiper can be cleaned down by the cleaning plant for moving up and down, by sponge wiper surface
Dust is collected into dust-collecting box, is uniformly processed, it is ensured that Faculty and Students it is healthy.
Brief description of the drawings
In order to illustrate more clearly of technical scheme of the invention or of the prior art, below will be to embodiment or prior art
The accompanying drawing to be used needed for description is briefly described, it should be apparent that, drawings in the following description are only of the invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other accompanying drawings.
Fig. 1 be the present invention provide can be with the blackboard eraser general structure schematic diagram of automatic dust removing；
Fig. 2 be the present invention provide can be with back box, blackboard eraser body and blow-dry device structure in the blackboard eraser of automatic dust removing
Schematic diagram；
Fig. 3 be the present invention provide can be with cleaning plant structural representation in the blackboard eraser of automatic dust removing；
Fig. 4 be the present invention provide can be with back box partial enlarged drawing in the blackboard eraser of automatic dust removing.
Description of reference numerals：
1- water tanks, 11- water inlets, 12- universal wheels, 13- snap rings, 2- water pipes, 21- shower nozzles, 3- back box, 31- is slided
Bar, 32- springs, 33- dust-collecting boxes, 34- nuts, 4- blackboard eraser bodies, 41- sponge wipers, 42- chutes, 43- support bars, 44- connects
Extension bar, 45- fixed plates, 46- is raised, 47- rotating shafts, 48- bristles, 49- handles, 5- blow-dry devices, 51- blowing mouths.
Specific embodiment
Below in conjunction with accompanying drawing of the invention, the technical scheme in the present invention is clearly and completely described, it is clear that
Described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of protection of the invention.
Embodiment 1
As Figure 1-Figure 4, it is exemplary present invention offer is provided can be with the blackboard eraser of automatic dust removing, the blackboard eraser
Mainly include：Blackboard eraser body 4 is fixed at water tank 1, water pipe 2, back box 3, blackboard eraser body 4 and blow-dry device 5, the top of back box 3,
Blow-dry device 5 is fixed at the top of blackboard eraser body 4, and one end connection water tank 1 of water pipe 2, the other end enters blackboard eraser through back box 3
In body 4.
2 sliding bars 31 are inserted in the side of back box 3, and with respect to back box 3 slidably, sliding bar 31 is stretched into back box 3 sliding bar 31
One end be connected with the inwall of back box 3 by spring 32, the other end of sliding bar 31 stretches out back box 3 and is detachably connected dust
Box 33, when dust-collecting box 33 is moved by the power in spring direction, the front end face of dust-collecting box 33 is flushed with the surface of blackboard eraser body 4, is made
During with blackboard eraser blackboard wiping, pressure enable dust-collecting box 33 promote sliding bar 31 insert back box 3 in, when blackboard eraser leave it is black
After plate surface, elastic force when spring 32 resiles is so that sliding bar 31 drives dust-collecting box 33 to be displaced outwardly.
The side of blackboard eraser body 4 is provided with 3 shower nozzles 21, each shower nozzle 21 with the water pipe 2 stretched into blackboard eraser body 4
Connection, blackboard eraser body 4 is provided with the side of shower nozzle 21 and is removably connected with sponge wiper 41, and sponge wiper 41 is located at dust-collecting box 33
Top.
Blackboard eraser body 4 also includes cleaning plant, and cleaning plant includes support bar 43, connecting rod 44 and brush, sponge brush
The blackboard eraser body 4 of the side of cloth 41 is provided with chute 42, and support bar 43 is limited in chute 42, and relative chute 42 is slidably,
Connecting rod 44 is L-type, and the top rotation of the quarter butt one end of connecting rod 44 and support bar 43 is connected, the stock one end of connecting rod 44 and brush
It is fixedly connected, 1/2 width of the length more than the brush of the quarter butt of connecting rod 44.
Wherein, blow-dry device 5 include heating wire, fan, switch and battery, heating wire, fan, switch and battery according to
It is secondary to be connected by wire, after the shower nozzle 21 in blackboard eraser body 4 is wiped to blackboard surface sprinkling, start blow-dry device 5, electric heating
Silk cooperation fan blows out hot blast from air outlet 51, can quickly dry up blackboard surface；The top of water tank 1 is provided with water inlet 11, enters
Added water in the water supply case 1 of the mouth of a river 11, the side of water tank 1 is provided with snap ring 13, and water pump, the output of water pump are provided with water tank 2
End is connected with water pipe 6, and water delivery provides power in water pump water supply pipe, and the bottom of water tank 2 is provided with universal wheel 12, and universal wheel 12 sets
There is self-locking structure, universal wheel 12 enables to water tank 2 to be moved with the movement of people；Blackboard eraser body 4 is with respect to sponge wiper
41 side is provided with handle 49, and handle 49 is easy to user to use blackboard eraser blackboard wiping, handle 49 and the cocker of snap ring 13
Close, after blackboard eraser is using terminating, handle 49 can be such that blackboard eraser is fixed on water tank 2, will not lose or damage.
Further, sliding bar 31 stretches out one end of back box 3 and is provided with screw thread, and sliding bar 31 leads to through the side of dust-collecting box 33
Nut 34 is crossed to connect.
Further, sponge wiper 41 is connected with blackboard eraser body 4 by VELCRO.
Further, the top of support bar 43 is provided with two projections 46, and the quarter butt one end of connecting rod 44 is arranged at two projections 46
Between and be connected by rotating shaft 47 with two projections 46, when connecting rod 44 is turned to be generally aligned in the same plane with support bar 43, even
The brush of the connection of extension bar 44 is capable of the surface of cleaning sponge wiper 41, when blackboard eraser body 4 needs to spray water blackboard to be wiped, will
Support bar 43 moves to the either end of chute 42, rotates connecting rod 44 so that connecting rod 44 be located at the top that wipes sponge or
Lower section, without prejudice to wipes the use of sponge.
Further, brush is made up of fixed plate 45 with the bristle 48 for being fixed on the bottom of fixed plate 45.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of can be with the blackboard eraser of automatic dust removing, it is characterised in that including：
Water tank (1), water pipe (2), back box (3), blackboard eraser body (4) and blow-dry device (5), the top of the back box (3) are fixed
The blow-dry device (5), the one of the water pipe (2) are fixed in the blackboard eraser body (4), the top of the blackboard eraser body (4)
End connection water tank (1), the other end enters in the blackboard eraser body (4) through the back box (3)；
At least one sliding bar (31) is inserted in back box (3) side, and the relatively described back box (3) of the sliding bar (31) can slide
Dynamic, one end that the sliding bar (31) is stretched into the back box (3) is connected by spring (32) with the inwall of the back box (3),
The other end of the sliding bar (31) stretches out the back box (3) and is detachably connected dust-collecting box (33), the dust-collecting box (33)
When being moved by the power in spring direction, the front end face of the dust-collecting box (33) is flushed with the blackboard eraser body (4) surface；
The side of the blackboard eraser body (4) is provided with multiple shower nozzles (21), each described shower nozzle (21) with stretch into the blackboard
Water pipe (2) connection in body (4) is wiped, the blackboard eraser body (4) is provided with shower nozzle (21) side and is removably connected with sponge brush
Cloth (41), top of the sponge wiper (41) positioned at the dust-collecting box (33)；
The blackboard eraser body (4) also includes cleaning plant, and the cleaning plant includes support bar (43), connecting rod (44) and brush
Son, the blackboard eraser body (4) of sponge wiper (41) side is provided with chute (42), and the support bar (43) is limited in
In the chute (42), and relatively described chute (42) is slidably, and the connecting rod (44) is L-type, and the connecting rod (44) is short
Bar one end rotates with the top of the support bar (43) and is connected, and described connecting rod (44) stock one end is fixedly connected with brush, institute
State 1/2 width of the length more than the brush of connecting rod (44) quarter butt.
2. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the blow-dry device (5) includes
Heating wire, fan, switch and battery, the heating wire, fan, switch and battery pass sequentially through wire connection.
3. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that set at the top of the water tank (1)
The side for having water inlet (11), the water tank (1) is provided with snap ring (13), and water pump, the water pump are provided with the water tank (2)
Output end be connected with the water pipe (6), the bottom of the water tank (2) is provided with universal wheel (12), and the universal wheel (12) is provided with
Self-locking structure.
4. according to claim 3 can be with the blackboard eraser of automatic dust removing, it is characterised in that blackboard eraser body (4) phase
Side to the sponge wiper (41) is provided with handle (49), and the handle (49) can engage with the snap ring (13).
5. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the blow-dry device (5) be close to
Sponge wiper (41) side is provided with blowing mouth (51).
6. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the sliding bar (31) stretches out institute
The one end for stating back box (3) is provided with screw thread, and the sliding bar (31) is connected through the side of the dust-collecting box (33) by nut (34)
Connect dust-collecting box (33).
7. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the shower nozzle (21) is 3.
8. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the sponge wiper (41) and institute
Blackboard eraser body (4) is stated to be connected by VELCRO.
9. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that support bar (43) top sets
There are two projections (46), described connecting rod (44) quarter butt one end is arranged between two projections (46) and described with two convex
(46) are played to be connected by rotating shaft (47).
10. according to claim 1 can be with the blackboard eraser of automatic dust removing, it is characterised in that the brush include fixed plate
(45) and it is fixed on the bristle (48) of the fixed plate (45) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185585.4A CN106827903B (en) | 2016-12-20 | 2016-12-20 | It is a kind of can be with the blackboard eraser of automatic dust removing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185585.4A CN106827903B (en) | 2016-12-20 | 2016-12-20 | It is a kind of can be with the blackboard eraser of automatic dust removing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106827903A true CN106827903A (en) | 2017-06-13 |
| CN106827903B CN106827903B (en) | 2018-07-17 |
Family
ID=59139658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611185585.4A Expired - Fee Related CN106827903B (en) | 2016-12-20 | 2016-12-20 | It is a kind of can be with the blackboard eraser of automatic dust removing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106827903B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214114A (en) * | 2017-06-29 | 2017-09-29 | 嘉兴学院 | A kind of cleaning device of blackboard eraser |
| CN107297981A (en) * | 2017-07-27 | 2017-10-27 | 张冬 | A kind of watery chalk blackboard eraser |
| CN107933165A (en) * | 2017-11-15 | 2018-04-20 | 华北科技学院 | A kind of hand-held blackboard-cleaning device |
| CN108099457A (en) * | 2017-12-26 | 2018-06-01 | 方正圆 | A kind of education blackboard cleaning device |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2186669Y (en) * | 1994-04-14 | 1995-01-04 | 但恭泽 | Convenient dust-absorbing blackboard brush |
| CN2228850Y (en) * | 1995-09-29 | 1996-06-12 | 陈秉煌 | Blackboard eraser |
| JP2008254411A (en) * | 2007-04-05 | 2008-10-23 | Masao Tanaka | Eraser |
| CN201165148Y (en) * | 2008-01-30 | 2008-12-17 | 张燕 | Chalk dust absorbing blackboard eraser |
| CN201217342Y (en) * | 2008-05-15 | 2009-04-08 | 陕西科技大学 | Environment-friendly non-dust self-cleaning blackboard eraser |
| KR20100005034U (en) * | 2008-11-06 | 2010-05-14 | 이기성 | A Box for Clearing an eraser of blackbord |
| CN203004855U (en) * | 2012-12-24 | 2013-06-19 | 彭云杉 | Dust-collecting blackboard wiper |
| CN203254837U (en) * | 2013-03-05 | 2013-10-30 | 刘桂龙 | Novel blackboard eraser |
| CN204294594U (en) * | 2014-10-30 | 2015-04-29 | 王海浩 | Blackboard eraser dust remover |
-
2016
- 2016-12-20 CN CN201611185585.4A patent/CN106827903B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2186669Y (en) * | 1994-04-14 | 1995-01-04 | 但恭泽 | Convenient dust-absorbing blackboard brush |
| CN2228850Y (en) * | 1995-09-29 | 1996-06-12 | 陈秉煌 | Blackboard eraser |
| JP2008254411A (en) * | 2007-04-05 | 2008-10-23 | Masao Tanaka | Eraser |
| CN201165148Y (en) * | 2008-01-30 | 2008-12-17 | 张燕 | Chalk dust absorbing blackboard eraser |
| CN201217342Y (en) * | 2008-05-15 | 2009-04-08 | 陕西科技大学 | Environment-friendly non-dust self-cleaning blackboard eraser |
| KR20100005034U (en) * | 2008-11-06 | 2010-05-14 | 이기성 | A Box for Clearing an eraser of blackbord |
| CN203004855U (en) * | 2012-12-24 | 2013-06-19 | 彭云杉 | Dust-collecting blackboard wiper |
| CN203254837U (en) * | 2013-03-05 | 2013-10-30 | 刘桂龙 | Novel blackboard eraser |
| CN204294594U (en) * | 2014-10-30 | 2015-04-29 | 王海浩 | Blackboard eraser dust remover |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107214114A (en) * | 2017-06-29 | 2017-09-29 | 嘉兴学院 | A kind of cleaning device of blackboard eraser |
| CN107297981A (en) * | 2017-07-27 | 2017-10-27 | 张冬 | A kind of watery chalk blackboard eraser |
| CN107933165A (en) * | 2017-11-15 | 2018-04-20 | 华北科技学院 | A kind of hand-held blackboard-cleaning device |
| CN108099457A (en) * | 2017-12-26 | 2018-06-01 | 方正圆 | A kind of education blackboard cleaning device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106827903B (en) | 2018-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106827903A (en) | It is a kind of can be with the blackboard eraser of automatic dust removing | |
| CN207401879U (en) | A kind of test tube automatic washing apparatus | |
| CN204930301U (en) | A kind of water-saving environment-friendly high-efficiency fruit washer | |
| CN107414649B (en) | A kind of metal tube rust-cleaning integrating machine | |
| CN212038864U (en) | Ball belt cleaning device that sports used | |
| CN204274385U (en) | A kind of sole sleet cleaner | |
| CN206315567U (en) | Cleaner for filter element | |
| CN206277844U (en) | One kind improvement dust-free black board eraser | |
| CN207709427U (en) | Liquid crystal display panel cleaning device | |
| CN206170978U (en) | Novel blackboard and teaching system | |
| CN108078510A (en) | A kind of metope swab with spraying function | |
| CN108589604A (en) | A kind of civil construction clean-in-place device | |
| CN204765410U (en) | Sweeper | |
| CN208991309U (en) | A kind of battery dedusting dust-absorbing box | |
| CN2855295Y (en) | Dusting, cleaning, wipping dryer | |
| CN110586325A (en) | Efficient self-cleaning wet-type electric dust removal system | |
| CN208837833U (en) | A kind of metope swab with spraying function | |
| CN206550038U (en) | A kind of cleaning device for photovoltaic module | |
| CN215656896U (en) | Pipeline inner wall belt cleaning device | |
| CN206425270U (en) | One kind cleans thoroughly washing copper strips machine | |
| CN206251724U (en) | Frame is scraped in a kind of self-cleaning of pig house machine for turning up the soil and harrowing | |
| CN111006406B (en) | Cleaning equipment for solar vacuum tube | |
| CN209378698U (en) | A kind of pumping dirt device auxiliary air-washer | |
| CN209186575U (en) | A kind of washroom cleaning device | |
| CN209577184U (en) | A kind of scraper device of coating machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180717 Termination date: 20181220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |