SI22920A2

SI22920A2 - Pistol for feeding of polyurethane foam

Info

Publication number: SI22920A2
Application number: SI200800273A
Authority: SI
Inventors: VEDRAL@Miha
Original assignee: MVA@d@o@o
Priority date: 2008-11-10
Filing date: 2008-11-10
Publication date: 2010-05-31

Abstract

A pistol for feeding of polyurethane foam consists of a housing (1) which is prolonged by an effusion pipe (2) at the front end and fitted with a handle (3) at the rear end. The said housing (1) comprises, in addition to a pivotable trigger (13), a reception assembly (10) to attach a can containing components for the preparation of the polyurethane foam, which is connected, via a passage (11), with a chamber (12) inside of the housing (1), to which the said pipe (2), terminated by a nozzle (21), is attached. Into the latter, a tip (141) is optionally inserted of a needle (14) which leads through the said pipe (2), the chamber (12) and a gasket (16) within the housing (1) to a controlling screw (17), which is screwed with its threaded stem (171) into a threaded housing's (1) hole (18) which lies coaxially with the said needle (14). The said needle (14) is further fitted with a widening (142) whose towards-the- pipe (2) turned end represents a striker face (140) of the trigger (13), and whose opposite end is supported by a compression spring (16) which is abutted to the controlling screw (17). On the controlling screw (17), a radial recess (172) is provided, into the range of which a radial safety catch (19) protrudes to prevent any unintentional unscrewing of the screw (17) out of the hole (18).

Description

Pištola za dovajanje poliuretanske penePolyurethane foam feed gun

Izum se nanaša na pištolo za dovajanje poliuretanske pene. Pri tem gre za pištolo, h kateri je mogoče priključiti ustrezno dozo, napolnjeno s komponentami za pripravo poliuretanske pene in hkrati tudi s primernim potisnim plinom. Med iztekanjem komponent iz omenjene doze se v območju pištole tvori poliuretanska pena, ki jo je mogoče nanašati na določeno mesto, npr. v fuge pri vgradnji oken ali vrat med zaključnimi deli v gradbeništvu ali tudi drugod. Pištola po eni strani omogoča regulacijo iztekanja komponent in s tem določanje količine ustvarjene pene, hkrati pa tudi usmerjanje le-te na vsakokrat želeno mesto.The invention relates to a polyurethane foam feed gun. This is a gun to which a suitable dose can be attached, filled with components for the preparation of polyurethane foam and at the same time with a suitable propellant. During leakage of components from said dose, a polyurethane foam is formed in the area of the gun, which can be applied to a particular site, e.g. in joints when installing windows or doors between finishes in construction or elsewhere. On the one hand, the gun regulates the leakage of components, thereby determining the amount of foam created, while also directing the foam to the desired location.

Tovrstni izumi so po mednarodni patentni klasifikaciji razvrščeni na področje delovnih procesov, zlasti na področje predelave umetnih mas, še zlasti pa na pripravo umetnih mas. Prav tako jih je mogoče v okviru delovnih procesov uvrstiti tudi na področje pripomočkov za brizganje oz. distribucijo umetnih mas, ki so značilni po možnosti spreminjanja izstopne količine. Še nadalje je mogoče tovrstne izume spet v okviru delovnih procesov razvrstiti na področje pištol za nanašanje tekočin ali drugih tekočih snovi, pri čemer te pištole lahko uporabnik prenaša s seboj.According to the international patent classification, such inventions are classified in the field of work processes, in particular in the field of plastics processing, and in particular in the preparation of plastics. They can also be classified into the field of injection molding or injection molding as part of work processes. distribution of plastics, characterized by the possibility of varying the output quantity. It is further possible to classify such inventions again within the scope of work processes into the field of guns for the application of liquids or other liquid substances, whereby these guns may be carried with the user.

Izum temelji na problemu, kako pri pištoli preprečiti možnost nehotene odstranitve regulacijskega vijaka iz ohišja in posledično nekontrolirano uhajanje pene v primeru odstranitve regulacijskega gumba ali v drugih primerih neustreznega ravnanja z omenjenim gumbom.The invention is based on the problem of how to prevent the gun from accidentally removing the control screw from the housing and the consequent uncontrolled leakage of foam in case of removal of the control knob or in other cases of improper handling of the said knob.

Iz SI 21210 in tudi iz PCT/SI/03/00015 je znana pištola, pri kateri je v ohišju vpeta v svoji osni smeri s pomočjo petelina in proti sili vzmeti premakljiva zapiralna igla, katere konica sega v območje šobe, s katero je zaključen cevast nastavek s katerim je opremljeno ohišje. Na ohišju je v območju nad petelinom na voljo prirobnica za vpetje tlačne doze s komponentami za pripravo poliuretanske pene. Med omenjeno prirobnico in ohišjem je na voljo prehod, ki od zunaj navznoter vodi v območje komore, ki poteka vzdolž omenjene igel v smeri proti omenjeni šobi, v smeri proti petelinu in ročaju pištole pa je omejena s stavkom tesnil. Petelin, ki je v ohišju zavihtljivo uležiščen, je oprt na naslonu, s katerim je opremljena omenjena igla, ki je po drugi strani v območju omenjenega naslona v aksialni smeri proti šobi podprta s tlačno vzmetjo, ki je oprta na regulacijskem gumbu, ki je privit v omenjeno ohišje v območju nad ročajem pištole. Z vrtenjem omenjenega regulacijskega gumba eno smer je možno ob stiskanju vzmeti čelno ploskev gumba prisloniti ob čelno ploskev igle in slednjo premakniti karseda globoko v šobo oziroma v svetlino šobe, in obrnem onemogočiti premik igle v smeri odpiranja svetline šobe navzlic aktiviranju petelina. Na tak način npr. uporabnik po končani uporabi pištolo zaklene in prepreči dostop zraka v notranjost pištole do komore s še nestrjeno poliuretansko peno. Temu nasprotno je možno z vrtenjem regulacijskega vijaka v drugo smer vijak odmakniti od igle in sprostiti omenjeno vzmet ter na ta način zagotoviti možnost odmika igle iz šobe v primeru premika petelina, s čimer je znova omogočena normalna uporaba pištole za dovajanje poliuretanske pene.A gun is known from SI 21210 and also from PCT / SI / 03/00015, in which a movable locking needle is mounted in its housing in the axial direction by means of a cock and an emergency spring whose tip extends into the area of the nozzle with which the tubular end is terminated. a nozzle that comes with a housing. On the housing in the area above the cock there is a flange for mounting a pressure dose with components for the preparation of polyurethane foam. A passage is provided between said flange and the housing, which leads from the outside to the chamber area, which runs along said needles in the direction of said nozzle, and is limited by a gasket strike in the direction of the cock and the handle of the gun. The cock, which is pivotally restrained in the housing, is supported on a backrest, which is provided with said needle, which, in turn, in the area of said backrest in axial direction towards the nozzle is supported by a pressure spring, which is supported on a control knob that is screwed into said housing in the area above the gun handle. By rotating the aforementioned control knob one direction, it is possible to press the front face of the button against the front face of the needle and move it as far as possible into the nozzle or into the nozzle brightness, and in turn prevent the needle from moving in the direction of opening the nozzle towards the activation of the cock. In this way e.g. the user, after using the gun, locks and prevents the air inside the gun from reaching the chamber with the polyurethane foam still uncured. Alternatively, by turning the control screw in the other direction, it is possible to move the screw away from the needle and release said spring, thereby ensuring that the needle can be moved away from the nozzle in the event of a cock being moved, thus allowing the normal use of the polyurethane foam feed gun again.

Vselej ko po deaktiviranju pištole s privitjem omenjenega vijaka uporabnik želi znova uporabljati pištolo, mora torej odvit omenjeni regulacijski vijak. Nevešči ali malomarni uporabniki pa načeloma lahko vijak odvijejo bistveno preveč, in sicer do te mere, da navoj vijaka izstopi iz navoja v ohišju, s čimer se vijak loči od ohišja in igla zgubi svojo oporo. V takem primeru tudi napetost vzmeti popusti in pritisk pene v notranjosti pištole odrine iglo in/ali tesnilo v smeri proti ročaju ter sprosti prehod pene vzdolž ročaja v smeri proti ročaju, nakar pena prosto izstopa iz ohišja. Če pride do tega, pištola postane praktično neuporabna, možne pa so tudi poškodbe predmetov v okolici pištole. Temu ustrezno bi bilo zelo zaželeno, če bi bilo navzlic možnosti zaklepanja in odklepanja pištole možno preprečiti nehoteno odstranitev regulacijskega vijaka iz ohišja in se s tem vnaprej izogniti sleherni možnosti, da bi do omenjenega izlitja poliuretanske pene sploh lahko prišlo.Whenever after the deactivation of the gun by tightening the said screw, the user wishes to use the gun again, then he must unscrew the said adjustment screw. Inadvertent or negligent users can, in principle, unscrew the screw substantially, to the extent that the thread of the screw exits the thread in the housing, thereby separating the screw from the housing and the needle losing its support. In such a case, the spring tension also loosens and the foam pressure inside the gun pulls the needle and / or gasket towards the handle and releases the foam passage along the handle towards the handle, and then the foam exits the housing freely. If so, the gun becomes practically unusable, and damage to objects in the vicinity of the gun is possible. Accordingly, it would be highly desirable if the possibility of locking and unlocking the gun could be prevented by inadvertently removing the control screw from the housing and thus avoiding any possibility that the polyurethane foam leak would occur at all.

Predmetna pištola za dovajanje poliuretanske pene sestoječa iz ohišja (1), ki je na prednjem koncu podaljšano z izlivno cevjo (2) in na zadnjem koncu opremljeno z ročajem (3), omenjeno ohišje (1) pa poleg zasukljivega petelina (13) obsega prejemni sklop (10) za priključitev doze s komponentami za pripravo poliuretanske pene, ki je preko prehoda (11) povezan s komoro (12) v notranjosti ohišja (1), s katero je povezana omenjena cev (2), ki je zaključena s šobo (21), v katero je po izbiri vstavljiva konica (141) igle (14), ki poteka skozi omenjeno cev (2) in komoro (12) ter tesnilo (16) v ohišju (1) do regulacijskega vijaka (17), ki je s svojim navojnim steblom (171) privit v navojno luknjo (18) v ohišju (1), ki poteka soosno z omenjeno iglo (14), pri čemer je igla (14) opremljena z odebelitvijo (142), katere proti cevi (2) obrnjen konec predstavlja nased (140) petelina (13), njen nasprotni konec pa je podprt s tlačno vzmetjo (16), kije oprta na regulacijskem vijaku (17).A subject gun for supplying polyurethane foam consisting of a housing (1) which is extended at the front end by an outlet tube (2) and equipped with a handle (3) at the rear end, said housing (1) having a receiving in addition to a rotatable cock (13) an assembly (10) for connecting a dose to components for the preparation of a polyurethane foam, which is connected via a passage (11) to a chamber (12) inside the housing (1) to which said tube (2) is terminated by a nozzle ( 21) into which is optionally inserted a needle tip (141) (14) extending through said tube (2) and chamber (12) and a seal (16) in the housing (1) to a control screw (17) which is with its threaded stem (171) screwed into a threaded hole (18) in a housing (1) extending co-axially with said needle (14), the needle (14) being provided with a detachment (142) which is against the tube (2) the inverted end represents the seat (140) of the cock (13) and its opposite end is supported by a pressure spring (16) resting on the control screw (17).

Po izumu je na regulacijskem vijaku predvidena radialna vdolbina, v območje katere sega radialno varovalo za preprečevanje nehotenega odvitja regulacijskega vijaka iz luknje. Omenjena vdolbina je prednostno razporejena v območju navojnega stebla regulacijskega vijaka in je prednostno na voljo kot obodni utor na regulacijskem vijaku. Omenjeno radialno varovalo je prednostno na voljo kot vijak ali navojni zatič in je prednostno v ohišje v območju priključitve ročaja na ohišje pištole.According to the invention, a radial recess is provided on the control screw, in the area of which a radial guard extends to prevent inadvertent unwinding of the control screw from the hole. Said recess is preferably arranged in the area of the threaded stem of the control screw and is preferably available as a circumferential groove on the control screw. Said radial guard is preferably provided as a screw or threaded pin and is preferably inserted into a housing within the region of connection of the handle to the gun housing.

Izum bo v nadaljevanju obrazložen na osnovi konkretnega primera izvedbe, ki je prikazan na priloženi skici, kjer kažeThe invention will hereinafter be explained on the basis of a specific embodiment shown in the accompanying drawing showing

Sl. 1 pištolo za dovajanje poliuretanske pene v vzdolžnem prerezu,FIG. 1 gun for supplying polyurethane foam in longitudinal section,

Sl. 2 pa podrobnost A po Sl. 1.FIG. 2 is a detail A according to FIG. 1.

Pištola za dovajanje poliuretanske pene sestoji iz ohišja 1, ki je na prednjem koncu podaljšano z izlivno cevjo 2 in na zadnjem koncu opremljeno z ročajem 3. Ročaj 3 je v prikazanem primeru na razstavljiv način povezan z ohišjem 1, in sicer s pomočjo vijaka 31.The polyurethane foam feed gun consists of a housing 1, which is extended at the front end by an outlet tube 2 and equipped with a handle at the rear end. The handle 3 is, in the example shown, disassembled with the housing 1 by means of a screw 31.

Na ohišju 1 je predviden prejemni sklop 10 za povezavo z vsakokrat razpoložljivo dozo, ki vsebuje komponente za pripravo poliuretanske pene in ustrezen potisni plin, pri čemer omenjena doza na skici ni prikazana. Od omenjenega sklopa 10 v notranjost ohišja 1 vodi prehod 11, ki se steka v komoro 12, ki se nahaja v notranjosti ohišja 1 in s katero je povezana omenjena izlivna cev 2. Nadalje je v ohišju 1 v ustreznem vrtišču 130 zasukljivo vpet petelin 13, ki je prirejen za sodelovanje z iglo 14, ki poteka vzdolž ohišja 1 skozi omenjeno komoro 12 in s svojim koničastim koncem 140 sega v notranjost šobe 21, s katero je zaključena omenjena cev 2.On the housing 1, there is provided a receiving assembly 10 for connection to a dose available at each time comprising components for the preparation of polyurethane foam and a suitable propellant gas, the said dose not being shown in the drawing. From said assembly 10, a passage 11 extends into the interior of the housing 1, which flows into a chamber 12 located inside the housing 1 and to which said outlet pipe 2 is connected. Further, a cock 13 is rotated in the housing 1 in the corresponding pivot 130, adapted to cooperate with a needle 14 extending along said housing 1 through said chamber 12 and with its tapered end 140 extending into the nozzle 21 with which said tube 2 is terminated.

Omenjena komora 12 je na proti ročaju 3 obrnjenem koncu omejena s tesnilom 15, skozi katerega poteka igla 14 naprej proti petelinu 13, ki je oprt na ustreznem nasedu 141, ki je na voljo na odebeljenem odseku 142 igle 14, proti kateremu na nasprotnem koncu pritiska tlačna vzmet 16, ki je podprta z regulacijskim vijakom 17.Said chamber 12 is circumscribed by a seal 15 at the handle 3 facing end, through which a needle 14 extends forward towards the cock 13, which is supported on the corresponding seat 141, which is available at a thickened section 142 of the needle 14, against which at the opposite end of the pressure pressure spring 16 supported by control screw 17.

Omenjeni regulacijski vijak 17 obsega navojno steblo 171, kije privito v navojno luknjo 18 v ohišju 1, ki poteka soosno z omenjeno komoro 12 in iglo 14. Po izumu je steblo 171 regulacijskega vijaka 17 opremljeno z vsaj radialno vdolbino 172, kije prednostno izvedena kot obodni utor in v katero v vsaj približno radialni smeri glede na os vijaka 17 oz. os igle 14 sega radialno varovalo 19, še zlasti varovalni vijak po izbiri pa navoj ni zatič, in s tem preprečuje nehoteno odvitje regulacijskega vijaka 17 iz pripadajoče navojne luknje 18 v ohišju 1. Kadar je omenjeno radialno varovalo 19 na voljo kot vijak ali navojni zatič, ga je možno na preprost način vgraditi med sestavljanjem pištole neposredno pred vzpostavitvijo povezave med ročajem 3 in ohišjem 1.Said control screw 17 comprises a threaded stem 171 which is screwed into a threaded hole 18 in the housing 1, which runs coaxially with said chamber 12 and a needle 14. According to the invention, the stem 171 of the regulation screw 17 is provided with at least a radial recess 172, preferably configured as circumferential groove and in which in at least approximately radial direction with respect to the axis of the screw 17 or. the needle axis 14 extends to the radial retainer 19, and in particular the retaining screw optionally has no thread, thus preventing the control screw 17 from unintentionally unscrewing from the corresponding threaded hole 18 in the housing 1. When said radial retainer 19 is available as a screw or threaded pin , it can be easily installed while assembling the gun just before the connection between the handle 3 and the housing 1 is established.

Kadar je regulacijski vijak 17 privit v navojno luknjo 18, je steblo 171 vijaka 17 oprto proti igli 14, ki je s tem potisnjena v notranjost šobe 21, ki je s tem tesno zaprta. Ko uporabnik na pištolo, namreč na prejemni sklop 10, namesti dozo s komponentami za pripravo poliuretanske pene, slednja vstopi skozi prehod 11 v komoro 12 in zatem v cev 2 vse do šobe 21. S pritiskom na petelina 13 v takem stanju pištole igle 14 ni možno premakniti zaradi naleganja slednje na steblu 171 regulacijskega vijaka 17, zato šoba 21 v vsakem primeru ostane zaprta in iztekanje pene iz cevi 20 je v vsakem primeru preprečeno.When the adjusting screw 17 is screwed into the threaded hole 18, the stem 171 of the screw 17 is propped against the needle 14, which is thereby pushed into the nozzle 21, which is thereby tightly closed. When the user places a dose on the gun, namely the receiving assembly 10, with components for the preparation of the polyurethane foam, the latter enters through the passage 11 into the chamber 12 and then into the tube 2 all the way to the nozzle 21. By pressing the cock 13 in this state of the needle gun 14 there is no it can be moved due to the latter being fixed on the stem 171 of the adjusting screw 17, so the nozzle 21 remains closed in each case and the escape of foam from the tube 20 is prevented in each case.

Šele po zadostnem odvitju regulacijskega vijaka 17 se steblo 171 vijaka 17 odmakne od igle 14 in odtlej dopušča premikanje igle 14 v njeni aksialni smeri. Spočetka igla 14 s svojo konico 141 še vedno tesni šobo 21, ker iglo 14 v smeri proti šobi 21 pritiska vzmet 16. S pritiskom na petelina 13 se igla 14 premakne v aksialni smeri proti regulacijskemu vijaku 17 in odpre prehod skozi šobo 21, s tem pa pena prične iztekati iz cevi 2 skozi omenjeno šobo 21 na prosto. Ko pritisk na petelina 13 popusti, vzmet 16 potisne iglo v smeri proti šobi 21 in konica 141 igle 14 šobo 21 spet zapre.It is only after the screw 17 is sufficiently unwound that the stem 171 of the screw 17 moves away from the needle 14 and hence permits the needle 14 to move in its axial direction. Initially, the needle 14 with its tip 141 still tightens the nozzle 21 because the needle 14 pushes the spring 16 towards the nozzle 21. By pressing the cock 13, the needle 14 moves in the axial direction toward the control screw 17 and opens the passage through the nozzle 21, thereby however, the foam starts to flow out of tube 2 through said nozzle 21 to the open. When the pressure on the cock 13 loosens, the spring 16 pushes the needle towards the nozzle 21 and the tip 141 of the needle 14 closes the nozzle 21 again.

V konte4kstu uvodoma zastavljenega problema torej regulacijskega vijaka 17 v nobenem primeru ni možno odviti do te mere, da bi navojno steblo 171 vijaka 17 izstopilo iz navojne luknje 18, na osnovi česar bi vijak 17 ne mogel več predstavljati potrebne podpore za vzmet 16 in varovala proti izpadanju igle 14 in tesnila 15.In the context of the problem set out in the foregoing, therefore, the adjustment screw 17 cannot in any case be disengaged to such an extent that the threaded stem 171 of the screw 17 exits the threaded hole 18, on the basis of which the screw 17 can no longer provide the necessary support for the spring 16 and protect against needle drop 14 and gasket 15.

Claims

CLAIMS 1. A polyurethane foam feed gun consisting of a housing (1) extended at the front end by an outlet tube (2) and equipped with a handle (3) at the rear end and said housing (1) in addition to a rotatable cock (13) comprising a receiving assembly (10) for connecting a dose to components for the preparation of polyurethane foam, which is connected via a passage (11) to a chamber (12) inside the housing (1) to which said tube (2) is terminated. a nozzle (21) into which the tip (141) of the needle (14) extends through said tube (2) and the chamber (12) and the seal (16) in the housing (1) to the control screw (17) is optionally inserted, which with its threaded stem (171) is screwed into a threaded hole (18) in a housing (1) extending co-axially with said needle (14), the needle (14) being provided with a detachment (142), which against the pipe ( 2) the inverted end represents the seat (140) of the cock (13) and its opposite end is supported by a pressure spring (16) resting on the control screw (17), marked but the radial recess (172) is provided on the control screw (17), in the area of which a radial guard (19) extends to prevent the screw (17) from being accidentally unwound from the hole (18).

Gun according to claim 1, characterized in that the recess (172) is disposed in the area of the threaded stem (171) of the control screw (17).

Gun according to claim 1 or 2, characterized in that the recess (172) is available as a circumferential groove on the control screw (17).

Gun according to one of Claims 1 to 3, characterized in that the radial guard (19) is provided as a screw.

Gun according to one of claims 1 to 3, characterized in that the radial guard (19) is provided as a threaded pin.

Gun according to claim 4 or 5, characterized in that the radial guard (19) is screwed into the housing in the area of connection of the handle (3) to the housing (1).