CN2231141Y - Airless spraying machine - Google Patents
Airless spraying machine Download PDFInfo
- Publication number
- CN2231141Y CN2231141Y CN 95244683 CN95244683U CN2231141Y CN 2231141 Y CN2231141 Y CN 2231141Y CN 95244683 CN95244683 CN 95244683 CN 95244683 U CN95244683 U CN 95244683U CN 2231141 Y CN2231141 Y CN 2231141Y
- Authority
- CN
- China
- Prior art keywords
- shunting
- commutation
- reversing
- groove
- slide block
- 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
Links
- 238000005507 spraying Methods 0.000 title abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 230000002411 adverse Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000002560 therapeutic procedure Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000008520 organization Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 31
- 230000000694 effects Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Reciprocating Pumps (AREA)
Abstract
A kind of airless spray coater, the shunting distributing reversing arrangement linking with air cylinder has double two-position three-way structure, namely on the left and right shunting side plate (15), there are upper and lower air channels (21), correspond to and switch on with the left and right and upper and lower air channel (13) on the shunting reversing valve body (7) separately; the reversing piston (1) is arranged in the central hole (8), the reversing slide block (23) reciprocates in the sliding groove (12) along with the reversing piston, and the reversing groove (24) leads an air inlet channel (18) on the shunt side plate (15) to be communicated with an air channel (19) or an air channel (17). A fine adjustment device and a sealing device are additionally arranged to ensure the air tightness; is provided with a wearing part which is wear-resistant and easy to replace. Can be used for various spraying occasions.
Description
The utility model relates to a kind of rust cleaning coating equipment, and relates more specifically to a kind of airless sprayer.
The anticorrosive measure of metallic article, comparatively effective method is at its surperficial coated one coating, with contacting of isolated metallic article and outside air, thus the slowly corrosion of metal level, the service life of raising metallic article.The method that the coating coated is commonly used has brushing, dip-coating, roller coating, spraying etc., especially spraying method, in view of it is to utilize equipment that coating is in high pressure conditions, by nozzle it is sprayed into mist again and coated in the surface of required coated, and form evenly attractive in appearance filming of one deck, and the thickness of filming can be controlled as required; Add that spraying coating process has that equipment is simple, easy construction, adaptability are strong, reduce the material consumption, reduce advantages such as pollution, so spraying method is well received a kind of coating method.But in background technology, as the commutating structure of flush coater critical component, Japan adopts the strength commutation, and beautiful, moral then adopts mechanical commutation, unfortunately " dead point " accident defect in their all unresolved commutation, and the defective that lack of uniformity caused that unidirectional air inlet brought.In the prior art at home and abroad, the integraty of changement and cylinder more makes spraying equipment because of the not interchangeable loss from spoilage that has caused the reduction in service life and caused complete machine.
Primary and foremost purpose of the present utility model, but be to be to design a kind of airless sprayer with two two-position three way structure reversing arrangements of two-way simultaneous air inlet.Another purpose of the present utility model is to be to design a kind of airless sprayer with split type replaceable fragile part reversing arrangement.Another purpose of the present utility model is to be to design a kind ofly to have micro-adjusting mechanism and guarantee the airtight airless sprayer that requires reversing arrangement.Another purpose of the present utility model is to be to design a kind of anticlogging stifled airless sprayer of releasing the control structure reversing arrangement that has.
The utility model is realized by following design: traditional shunting distribution reversing arrangement and cylinder are separated into disome, but can be connected as a body.It will have the structure of two two-position three ways, promptly shunt commutation valve body and two blocks of shunting side plates 15 that are loaded on its left and right sides by comprising, and reversing piston be formed with two that are nested in its left and right sides slide blocks that commutate.On the described left and right shunting side plate, be arranged with upper and lower gas passage, and respectively be located at shunting commutation valve body on the corresponding conducting of left and right and upper and lower gas passage.Described reversing piston then is loaded in the centre bore of shunting on the commutation valve body, and can do upper and lower reciprocal motion therein; Described commutation slide block is provided with groove, can be embedded on the projection in the reversing piston, thereby the commutation slide block can be driven by reversing piston, and with doing upper and lower reciprocal motion in its slide block slot on shunting commutation valve body.At this moment, be located at the commutation groove on the commutation slide block, be located at the gas passage of using for air inlet on the shunting side plate with making in turn, or be conducted with last gas passage or with therapeutic method to keep the adverse qi flowing downward passage.Thereby realize described pair of two-position three way structure of the design.One fine setting through hole is set, and on a projection on the reversing piston in the centre of described reversing piston, then establish one with finely tune through hole perpendicular with the fine setting screw that is connected; A steel ball is respectively put with finely tuning in the screw in two ends at the fine setting through hole, and three diameter of the steel ball sums then are slightly larger than the total length of fine setting through hole.So when a steel ball in the fine setting screw was exerted pressure, it clamp-oned the centre that is put in two steel balls in the fine setting through hole, forces two steel balls outwards to be extruded, and extruding and its commutation slide block that touches mutually, make it realize the effect of finely tuning with shunting side plate driving fit.The two ends of centre bore respectively serve as a contrast an anti-wearing liner on described shunting commutation valve body; In described commutation slide block upper groove and half slot intersection, be provided with the fine setting pad; Be provided with the boss surface place of three gas passages at described shunting side plate, establish an abrasion-proof backing block, thereby damageable zone was both strengthened, be convenient to again change.And shunting distribution reversing arrangement described in the utility model itself separates with cylinder body and interchangeable.On the hexagonal block of described control valve block, stifledly release the hole for three uniformly at intervals, with anti-clogging.
Effect of the present utility model is tangible, as adopted airless sprayer described in the utility model, can reach from the inlet and outlet simultaneously of left and right both sides, the i.e. effect of Yu Ding two two-position three ways, thus can avoid in the traditional product because of the lack of uniformity of monolateral inlet and outlet and the various defectives that produced thus.The design of fine tuning structure makes in assembling and the use and all can be adjusted, and the slide block of guaranteeing to commutate can closely combine all the time with the commutation side sheet room, with the shunting commutation effect that realizes being scheduled to.Damageable zone is provided with wear-resisting and interchangeable parts such as lining, liner plate or pad, not only durable but also interchangeable, the described shunting distribution of the design reversing arrangement particularly, itself separate and interchangeable with cylinder body, no matter thereby be other quick-wear part, still whole reversing arrangement all is removable, has fundamentally avoided the phenomenon with unnecessary waste of scrapping of complete machine.Seal approach has been adopted at main position, can prevent the seepage of gas and influences normal work.The design had then both guaranteed the effect of control to the improvement of control valve structure, can with needing of work or stop up or discharge gas again.In a word, behind employing the utility model, can realize the described expected effect of this specification.
Below in conjunction with accompanying drawing embodiment of the present utility model is described, thereby make CONSTRUCTED SPECIFICATION of the present utility model, characteristics, purpose and advantage clearer and more definite.
Fig. 1 is the structure chart of reversing piston among the utility model embodiment.
Fig. 2 is the structure chart of shunting commutation valve body in the present embodiment.
Fig. 3 is the structure chart of shunting side plate in the present embodiment.
Fig. 4 is the right view of commutation slide block in the present embodiment.
Fig. 5 is the front view of commutation slide block in the present embodiment.
Fig. 6 is the left view of commutation slide block in the present embodiment.
Fig. 7 is the vertical view of commutation slide block in the present embodiment.
Fig. 8 is the A-A cutaway view of reversing piston in the present embodiment.
Among the figure: 1-reversing piston, 2-O shape groove, 3-groove circle, 4-projection, 5-groove circle 6-fine setting 7-shunt reversing valve body, 8-centre bore, 9-anti-wearing liner, 10-frustum, 11-exhaust passage, hole 12-slide block slot, 13-gas passage, the 14-gas passage 15-shunting side plate 16-inlet channel 17-gas passage 18-gas passage 19-gas passage 20-abrasion-proof backing block 21-gas passage 22-seal groove 23-commutation slide block 24-reversing groove 25-groove 26-half slot 27-fine setting pad 28-fine setting screw 29-control spool 30-seal groove 31-centring ring 32-transition face 33-stifled spool 34-control valve block 35-stifled spool slotted eye 36-stifled hole 37-seal groove of releasing of releasing of releasing.
The structure of the utility model embodiment now is described in conjunction with the accompanying drawings:
As shown in drawings, the described a kind of airless sprayer of present embodiment is by comprising what coating cylinder, pump seat, the pump housing, cylinder, airless spray gun, vehicle frame, muffler and shunting distribution reversing arrangement were formed.Described shunting distribution reversing arrangement links to each other with cylinder, it has the structure of two two-position three ways, it comprises shunting commutation valve body 7 and is loaded on two blocks of shunting side plates 15 of its left and right sides, and reversing piston 1 is formed with two commutation slide blocks 23 that are nested in its left and right sides.In view of described shunting side plate 15 and commutation slide block 23, all be to adopt left and right two covers respectively, thereby constitute the double split flow structure of left and right equilibrium.Shown in accompanying drawing 3,2, on described left and right shunting side plate 15, respectively be arranged with upper and lower gas passage 21, and respectively be located at left and right shunting commutation valve body 7 on 13 corresponding conductings of upper and lower gas passage.Shown in accompanying drawing 1,2, described reversing piston 1 is loaded in the centre bore 8 of shunting commutation valve body 7, and can be therein up and down reciprocatingly motion.As set groove 25 on the accompanying drawing 5 described commutation slide blocks 23, can be embedded on the projection 4 in the reversing piston 1,23 of slide blocks of commutation are dissolved in the groove circle 5 of projection 4 both sides, thereby described commutation slide block 23 can be driven by reversing piston 1, and with pumping in its slide block slot 12 on shunting commutation valve body 7.At this moment, be located at the commutation groove 24 of commutation on the slide block 23, will back and forth make the gas passage of being located on the shunting side plate 15 18, or be conducted with gas passage 19 or with gas passage 17,, promptly constituted the structure of two-position three way.Whole shunting distribution reversing arrangement has then been realized predetermined two two-position three way requirements.
For example, with present embodiment, when reversing piston 1 moved upward, described reversing piston 1 slide block 23 that will commutate brought to the top, and left and right commutation groove 24 makes the gas passage 18 and 19 conductings of gas passage of oneself side respectively.At this moment, pressure-air enters from the inlet channel of being located on the left and right shunting side plate 15 16, gas passage 21 through gas passage 18, commutation groove 24, gas passage 19 and top enters the gas passage 13 that is located at shunting commutation valve body 7 tops, flows in the cylinder through gas passage 14 again; Waste gas in the cylinder is then pressed above-mentioned reverse discharge from lower channel, promptly extremely shunts commutation valve body 7 from cylinder, and be back to again through shunting side plate 15 and shunt the valve body 7 that commutates, and externally discharging from be located at the exhaust passage 11 of shunting on the commutation valve body 7.Closely to be connected in order guaranteeing to be divided between two gas passages 21 and 13 on the part, to be provided with seal groove 22 in the exit of gas passage 21, for the usefulness of laying sealing ring.When reversing piston 1 moves downward, then press opposite program from below air inlet, top exhaust.The application of the two two-position three way structures of the utility model; realize the thin stream of balance; successfully solved " dead point " problem in the commutation; solved the exhaust position with also being readily solved and absorbed the problem that heat causes " frost " to freeze and shut down, so also can work at sub-zero temperature because of air-flow is prominent quick-fried.The shunting commutating structure also can be reduced to 45 decibels from 75 decibels with the noise of equipment, reduces noise greatly, helps the protection of environment.
Closely cooperating with the shunting side sheet room in order to ensure the commutation slide block, also should be adjustable even wearing and tearing occur, shown in accompanying drawing 1,8, a micromatic setting can be set in the centre of described reversing piston 1.Described micromatic setting comprises by fine setting hole 6, fine setting screw 28, fine adjustment screw and three steel balls and being formed.Two projections 4 and reversing piston 1 intersection are located in described fine setting hole 6, its left and right respectively put a steel ball and with the commutation slide block 23 contact.Described fine setting screw 28 then is located on the projection 4 on the reversing piston 1, and vertical mutually with fine setting hole 6, and a steel ball is housed therebetween, and steel ball then is screwed with fine adjustment screw outward.In view of the diameter summation of described three steel balls is slightly larger than fine setting hole 6 total lengths, so when tightening fine adjustment screw, a fine adjustment screw i.e. steel ball in fine setting screw 28 is exerted pressure, this steel ball is about to clamp-on the centre of other two steel balls, make fine setting in the hole 6 two steel ball pressurizeds and each outside extruding, and its pressure passed to the commutation slide block 23 that is in contact with it, thus make commutation slide block 23 can be close to shunting side plate 15, realize predetermined fine setting purpose.Described micromatic setting can be used for assembling and setting, the adjustment that faces because of wearing and tearing in also can be used for using.
Can be in for the purpose of the center position of shunting the centre bore 8 on the commutation valve body 7 in order to ensure reversing piston 1; respectively be provided with an O shape groove 2 at reversing piston 1 two ends as shown in Figure 1; so that can regulate the position of reversing piston 1 in centre bore 8 by it respectively by adorning an O shape circle.Particularly when fine setting was stressed, the effect that described O shape circle is provided with was more obvious.In order to help reversing piston 1 for the purpose of the motion in the centre bore 8, a groove circle 3 is respectively established in the middle section at reversing piston 1 two ends, to reduce resistance and to be beneficial to its motion.
For the purpose of protecting the assembling of shunting commutation valve body 7 and helping reversing piston 1; as shown in Figure 2; centre bore 8 places at described shunting commutation valve body 7; can respectively serve as a contrast an anti-wearing liner 9 at its two ends; adopt copper sheathing as present embodiment; it both had been beneficial to wear-resisting, also was beneficial to the time only need change lining in wearing and tearing and get final product, and need not whole valve body is scrapped.At the relative end of two anti-wearing liners, a circular cone table top 10 then respectively is set, so that assembling the time is beneficial to entering of O shape circle.In the present embodiment, the central angle of described circular cone table top 10 adopts optimum value 30 degree.
In order to protect commutation slide block 23 not to be subjected to the wearing and tearing of steel ball, shown in accompanying drawing 5,6,, be provided with fine setting pad 27 at described commutation slide block 23 upper grooves 25 and half slot 26 intersections.Described fine setting pad 27 both than commutation slide block 23 withstand voltage mills, can be changed again where necessary.
For prevent because of frost freeze influence work normally for the purpose of, shown in accompanying drawing 4,5, the commutation groove 24 on the described commutation slide block 23 can be made one with skewed oval connected in star.Skewed cell wall does not have the dead angle, and when freezing because of frost, the ice crystal of being tied can be blown down along cell wall by air-flow at once to be held, and can not pile up and build-ups ice, thereby reach the purpose of frost protection.
For the purpose of protecting shunting side plate 15; as shown in Figure 3; be provided with the boss surface place of three gas passages at described shunting side plate 15; can establish an abrasion-proof backing block 20 in addition; as present embodiment for having adopted a corrosion resistant plate; directly do not contact commutation slide block 23 and worn and torn by it with protection shunting side plate 15, only need get final product by liner plate of transposing even need to change yet.
For the purpose of the effect that can guarantee at required time to realize to stop up or discharge, be provided with the stifled controlling organization of releasing of gas in the present embodiment.Shown in accompanying drawing 7,8, it is formed by comprising that control spool 29 and control valve are blocked a shot 34.Be provided with to block up on described control spool 29 and release spool 33 and centring ring 31, at it transition face 32 is arranged then between the two, other is provided with-seal groove 30; Be provided with stifled spool slotted eye 35, seal groove 37 and three the stifled holes 36 of releasing on the hexagonal block spaced apart of releasing on the described control valve block 34, the described stifled hole 36 of releasing is released spool slotted eye 35 and is communicated with blocking up.Wherein stifled release spool 33 can be under the effect of air pressure and spring, stretch into or withdraw from the stifled spool slotted eye 35 of releasing, promptly stop up or discharge and release stifled that spool slotted eye 35 communicates and release hole 36, thereby do not allow the outside seepage of gas, or allow unnecessary gas release hole 36 and outwards discharge from blocking up with stifled; Centring ring 31 is to make described spring to be in certain position; Transition face 32 can be curved surface, also can be round table surface, can allow the spring utmost point slip into location on the centring ring 31 easily when purpose is to assemble; Seal groove 30 and seal groove 37 all are in order to lay sealing ring usefulness, to keep airtight requirement; So the compartment of terrain is provided with three and stifled releases hole 36 on hex surface, can prevent from only to have in the traditional product one stifledly to release the hole, just in case the blocked safe handling that is about to the equipment that influences, and three blocked probability of while will greatly be reduced.
Claims (8)
1. airless sprayer, by comprising the coating cylinder, pump seat, the pump housing, cylinder, airless spray gun, vehicle frame, muffler and shunting distribution reversing arrangement are formed, it is characterized in that: the shunting distribution reversing arrangement that links to each other with cylinder has two two-position three way structures, it comprises shunting commutation valve body [7] and is loaded on two blocks of shunting side plates [15] of its left and right sides, reversing piston [1] and be nested in two of its left and right sides commutation slide blocks [23] and form, a described left side, part on the right side on stream side plate [15] on, therapeutic method to keep the adverse qi flowing downward passage [21], then respectively with shunting commutation valve body [7] on a left side, right and last, the corresponding conducting of therapeutic method to keep the adverse qi flowing downward passage [13]; Described reversing piston [1] is loaded in the centre bore [8] of shunting commutation valve body [7], and can pump therein; Groove [25] on the described commutation slide block [23], be embedded on the projection [4] in the reversing piston [1], thereby it can be driven by reversing piston [1], and with pumping in its slide block slot [12] on shunting commutation valve body [7], commutation groove [24] provided thereon, to back and forth make the gas passage [18] on the shunting side plate [15], or be conducted with gas passage [19] or with gas passage [17].
2. by the described airless sprayer of claim 1, it is characterized in that: the centre at described reversing piston [1] is provided with a micromatic setting, described micromatic setting comprises that finely tuning hole [6], fine setting screw [28], fine adjustment screw and three steel balls forms, two projections [4] and reversing piston [1] intersection are located in described fine setting hole [6], its left and right respectively put a steel ball and with the commutation slide block [23] touch mutually; Described fine setting screw [28] is then perpendicular with fine setting hole [6], and on the projection [4] located therein, a steel ball is housed therebetween, and steel ball then is screwed with fine adjustment screw outward.
3. by claim 1,2 described airless sprayers, it is characterized in that: described reversing piston [1] two ends respectively are provided with an O shape groove [2], then respectively establish a groove circle [3] in two ends to the center within it.
4. by the described airless sprayer of claim 3, it is characterized in that: the centre bore [8] at described shunting commutation valve body [7] is located, can respectively serve as a contrast an anti-wearing liner [9] at its two ends, the relative end of two anti-wearing liners then has a circular cone table top [10], and its central angle is good with 30 degree.
5. by the described airless sprayer of claim 4, it is characterized in that:, be provided with fine setting pad [27] in described commutation slide block [23] upper groove [25] and half slot [26] intersection.
6. by the described airless sprayer of claim 5, it is characterized in that: the commutation groove [24] on described commutation slide block [23] is with skewed oval connected in star.
7. by the described airless sprayer of claim 6, it is characterized in that: be provided with the boss surface place of three gas passages at described shunting side plate [15], can establish an abrasion-proof backing block [20] in addition.
8. by the described airless sprayer of claim 7, it is characterized in that: be provided with the stifled controlling organization of releasing of gas, it is by comprising that control spool [29] and control valve block [34] is formed, on described control spool [29], be provided with stifled release spool [33] and centring ring [31], at it transition face [32] is arranged then between the two, other is provided with-seal groove [30]; Be provided with stifled spool slotted eye [35], seal groove [37] and three the stifled holes [36] of releasing on the hexagonal block spaced apart of releasing on the described control valve block [34], the described stifled hole [36] of releasing is released spool slotted eye [35] and is communicated with blocking up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95244683 CN2231141Y (en) | 1995-09-08 | 1995-09-08 | Airless spraying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95244683 CN2231141Y (en) | 1995-09-08 | 1995-09-08 | Airless spraying machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2231141Y true CN2231141Y (en) | 1996-07-17 |
Family
ID=33885022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95244683 Expired - Fee Related CN2231141Y (en) | 1995-09-08 | 1995-09-08 | Airless spraying machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2231141Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101263303B (en) * | 2005-09-23 | 2010-09-29 | 瓦格纳喷涂技术有限公司 | Linear adjustment controller for pressure control of paint pumps |
-
1995
- 1995-09-08 CN CN 95244683 patent/CN2231141Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101263303B (en) * | 2005-09-23 | 2010-09-29 | 瓦格纳喷涂技术有限公司 | Linear adjustment controller for pressure control of paint pumps |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |