SI25888A

SI25888A - Chainsaw

Info

Publication number: SI25888A
Application number: SI201900182A
Authority: SI
Inventors: Rajko Bernik; Ivan DemĹˇar
Original assignee: UNIVERZA V LJUBLJANI BiotehniĹˇka fakulteta
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-03-31

Abstract

Namen izuma je pri motorni žagi med uporabo le-te preprečiti nehoteno uhajanje brezkončne verige (4) z rezili (40) iz uprijema s pogonskim verižnim kolesom (20) zaradi vdora ostankov lesa, zlasti drobnega vejevja in listja, v notranjost okrova žage, namreč v območje med omenjeno verigo (4) in pogonskim verižnim kolesom (20). V ta namen je omenjeno pogonsko verižno kolo (20) žage na svoji vstran od okrova (1) obrnjeni pročelni površini (201) opremljeno z vsaj dvema v obodni smeri omenjenega pogonskegaverižnega kolesa (20) simetrično razporejenima rebroma (202), z debelino (H), ki štrli od pročelne površine (201) in dolžino (L), ki vsaj deloma sega preko oboda (201') verižnega kolesa (20), pri čemer je vsako od omenjenih reber (202) razporejeno na pročelni površini (201) verižnega kolesa (20) pod kotom (a), pri čemer je na vsakem izmed omenjenih reber (202) na voljo vsaj en rezalni rob (202'), ki med vrtenjem pogonskega verižnega kolesa (20) zagotavlja rezanje lesenih predmetov v primeru vdora le-teh vneposredno bližino omenjenega pogonskega verižnega kolesa (20).The purpose of the invention is to prevent inadvertent leakage of the endless chain (4) with blades (40) from the grip of the drive chain wheel (20) due to the intrusion of wood residues, especially small branches and leaves, into the saw body, into the area between said chain (4) and the drive sprocket (20). For this purpose, said saw chain drive wheel (20) is provided on its frontal surface (201) facing away from the housing (1) with at least two ribs (202) symmetrically arranged in the circumferential direction of said drive chain wheel (20). ) projecting from the front surface (201) and a length (L) extending at least in part over the circumference (201 ') of the chain wheel (20), each of said ribs (202) being arranged on the front surface (201) of the chain wheel (201). the wheel (20) at an angle (a), wherein at least one cutting edge (202 ') is provided on each of said ribs (202), which ensures the cutting of wooden objects in the event of intrusion of the lever during the rotation of the drive chain wheel (20). these in the immediate vicinity of said drive sprocket (20).

Description

Verižna motorna žagaChainsaw

Izum se nanaša na verižno motorno žago, opremljeno z brezkončno verigo iz členov z ustreznimi rezili, omenjena veriga pa je vodena vzdolž primernega vodila in gnana s pomočjo pogonskega verižnega kolesa, ki je gnano s pomočjo primernega pogonskega sredstva, npr. motorja z notranjim izgorevanjem ali elektromotorja.The invention relates to a chainsaw equipped with an endless chain of links with suitable blades, said chain being guided along a suitable guide and driven by a drive chain wheel driven by a suitable drive means, e.g. internal combustion engine or electric motor.

Tovrstni izumi po Mednarodni klasifikaciji patentov spadajo na področje obdelave, konkretno pa na področje obdelave lesa, in sicer k žagam za les, namreč k verižnim žagam in priboru zanje.According to the International Classification of Patents, such inventions belong to the field of processing, and more specifically to the field of wood processing, namely to wood saws, namely to chain saws and accessories therefor.

Pri tem je izum osnovan na problemu, kako pri motorni žagi uvodoma opisane vrste med uporabo preprečiti nehoteno uhajanje brezkončne verige iz uprijema s pogonskim verižnim kolesom zaradi vdora ostankov lesa, zlasti drobnega vejevja in listja, v notranjost okrova žage, namreč v območje med brezkončno verigo in pogonskim verižnim kolesom.The invention is based on the problem of how to prevent inadvertent leakage of the endless chain from the grip of the drive chain wheel due to the intrusion of wood residues, especially small branches and leaves, into the interior of the saw body, namely into the area between the endless chain. and drive sprocket.

Verižna motoma žaga je opisana med drugim v EP 0 955 139 A2 in DE 10 2004 021 080 Al. Tovrstna motoma žaga obsega okrov, v katerem je vgrajen pogonski motor, npr. motor z notranjim zgorevanjem ali elektromotor, na katerega izstopni gredi je nameščeno pogonsko verižno kolo za pogon brezkončne verige. Brezkončna veriga je smiselno podobna običajni lamelni verigi in sestoji iz množice med seboj zavihtljivo povezanih členov, na lamelah omenjenih členov pa so oblikovana rezila, ki so prirejena za rezanje vsakokrat ustreznega materiala, v tem primeru lesa. Veriga j e nameščena na meču, katerega obodni rob je prirejen za vodenje verige, tako da pretežni del brezkončne verige nalega na omenjenem meču, določeno število členov verige pa sega preko omenjenega meča in nalega na pogonskem verižnem kolesu, ob katerem se nahaja omenjeni meč. Meč je s pomočjo primernega mehanizma in vodil do določene mere premakljiv glede na omenjen okvir in omenjeno pogonsko verižno kolo, s čimer je zagotovljena možnost napenjanja verige, obenem pa tudi možnost nameščanja ali odstranjevanja verige zaradi ostrenja rezil ali zamenjave poškodovane ali dotrajane verige. Iz varnostnih in estetskih razlogov je na okrovu motorne žage predviden odstranljiv pokrov, ki je nameščen preko pogonskega verižnega kolesa in preko vsaj tolikšnega območja meča za vodenje verige, ki se nahaja v bližini omenjenega pogonskega kolesa, da je s pokrovom preprečen dostop do vrtečih se delov in mehanizma za napenjanje verige, tako da iz okrova in izpod pokrova štrli zgolj delovno območje omenjenega meča z na sebi nameščeno brezkončno verigo. Ker se med delovanjem žage členi verige z razmeroma veliko hitrostjo premikajo vzdolž oboda omenjenega meča, je med mečem z verigo in okrovom žage po eni strani ter med mečem z verigo in pokrovom okrova po drugi strani na voljo določena špranja, skozi katero lahko v notranjost okrova, zlasti pod omenjeni pokrov, vdirajo manjši delci lesa, zlasti žago vina, med klestenjem oz. obžagovanjem drevja pa tudi lubje, drobno vejevje in listje. Vdiranje žagovine načeloma ne predstavlja večjega problema, ker gre za manjše delce, ki na sodelovanje med verigo in pogonskim verižnim kolesom običajno nimajo večjega vpliva. Problem se pojavi, kadar v območje med okrovom in pokrovom in še zlasti v območje sodelovanja med verigo in pogonskim verižnim kolesom vdre tanjše vejevje, ki postopoma zapolni prostor okoli pogonskega verižnega kolesa in se potem zagozdi še med pogonsko verižno kolo in verigo, zaradi česar mehanizem za napenjanje verige postane preobremenjen, veriga postane ohlapna in potem zaradi tujkov med njo in verižnim kolesom uide iz uprijema s slednjim. Problem je sicer načeloma rešljiv, vendar je treba v ta namen prekiniti z delom, ustaviti motor, odstraniti pokrov z okrova, očistiti območje okoli pogonskega verižnega kolesa pod pokrovom, namestiti verigo nazaj na pogonsko verižno kolo, uravnati napetost verige, namestiti pokrov in znova zagnati pogonski motor. Problem pa postane neznosno pereč v primeru, ko se med delom z motorno žago omenjeni problem vedno znova ponavlja, saj se že po nekaj minutah uporabe žage pod pokrovom spet nakopiči toliko tujkov, da to neizogibno privede do ponovne onesposobitve žage. To je ob bistvenem zmanjšanju učinkovitosti uporabe žage povezano tudi s tveganjem okvar posameznih delov zaradi pogostega sestavljanja in razstavljanja na terenu, obenem pa zaradi frustracij, katerim je pri tovrstnem režimu dela izpostavljen uporabnik, tudi možnost poškodb pri delu, ki pa so pri uporabi motorne žage lahko zelo resne.The chain saw is described, inter alia, in EP 0 955 139 A2 and DE 10 2004 021 080 A1. Such a motoma saw comprises a housing in which a drive motor is installed, e.g. an internal combustion engine or electric motor on which the output shaft is fitted with a drive chain wheel to drive the endless chain. The endless chain is reasonably similar to a conventional lamellar chain and consists of a plurality of hingedly connected links, and on the lamellae of said links are formed blades adapted to cut the appropriate material, in this case wood. The chain is mounted on a sword, the circumferential edge of which is adapted to guide the chain so that the bulk of the endless chain rests on said sword, and a number of chain links extend over said sword and rest on the drive sprocket next to said sword. The sword is movable to a certain extent with respect to said frame and said drive sprocket by means of a suitable mechanism and guides, thus providing the possibility of chain tensioning, as well as the possibility of installing or removing the chain due to sharpening blades or replacing damaged or worn chain. For safety and aesthetic reasons, a removable cover is provided on the chainsaw housing, which is mounted over the drive chain wheel and over at least the area of the chain guide sword located near said drive wheel so that the cover prevents access to rotating parts. and a chain tensioning mechanism so that only the working area of said sword with the endless chain mounted on it protrudes from the housing and under the cover. Since during the operation of the saw the chain links move at a relatively high speed along the circumference of said sword, there is a certain slit between the sword with the chain and the saw casing on the one hand and between the sword with the chain and the casing cover on the other. , especially under the mentioned cover, small particles of wood, especially the saw of wine, penetrate during pruning or. by sawing trees as well as bark, small branches and leaves. The penetration of sawdust is in principle not a major problem, as these are smaller particles that do not usually have a major impact on the cooperation between the chain and the drive sprocket. The problem arises when a thinner branch enters the area between the housing and the cover, and in particular the area of cooperation between the chain and the drive sprocket, which gradually fills the space around the drive sprocket and then gets stuck between the drive sprocket and the chain. for tensioning the chain it becomes overloaded, the chain becomes loose and then due to foreign bodies between it and the sprocket it escapes from the grip with the latter. The problem can be solved in principle, but for this purpose it is necessary to stop work, stop the engine, remove the cover from the housing, clean the area around the drive sprocket under the cover, install the chain back on the drive sprocket, adjust the chain tension, install the cover and restart drive motor. However, the problem becomes unbearably burning when the problem is repeated over and over again when working with a chainsaw, because after a few minutes of using the saw under the cover, so many foreign bodies accumulate again that it inevitably leads to re-disabling of the saw. This is associated with a significant reduction in the efficiency of the saw due to the risk of failure of individual parts due to frequent assembly and disassembly in the field, but also due to frustrations to which the user is exposed in this mode of work, the possibility of injuries at work. can be very serious.

Obravnavani izum se nanaša na verižno motorno žaga, ki obsega primerno oblikovan okrov s primernimi prijemali za rokovanje z žago, v omenjenem okrovu pa je vgrajen pogonski motor s pogonsko gredjo, na kateri je vgrajeno pogonsko verižno kolo. Tovrstna žaga je nadalje obsega v smeri vstran od omenjenega okrova štrleč meč, kije odstranljivo pritrdljiv na omenjen okrov v bližini omenjenega pogonskega verižnega kolesa in obsega vsaj vzdolž pretežnega dela njegovega oboda potekajoče vodilo za vodenje primemo napete brezkončne verige, ki je opremljena s primernimi rezili in nameščena preko omenjenega pogonskega verižnega kolesa in obenem tudi okoli omenjenega meča v območju na njem razpoložljivega vodila. Omenjeni meč je s pomočjo primernega napenjalnega mehanizma po izbiri premakljiv relativno glede na omenjeni okrov žage vsaj v tolikšni meri, da je s tem omogočeno nameščanje in napenjanje oz. popuščanje in odstranjevanje omenjene verige. Nadalje je na omenjenem okrovu predviden zaščitni pokrov, ki v stanju pripravljenosti žage za uporabo sega vsaj preko omenjenega pogonskega verižnega kolesa in v območju okrova razporejenega dela meča.The present invention relates to a chainsaw, comprising a suitably shaped housing with suitable grips for handling the saw, and in said housing a drive motor with a drive shaft on which the drive chain wheel is mounted is installed. This type of saw further comprises a protruding sword protruding away from said housing, which can be removably attached to said housing near said drive sprocket and comprises at least a guide guide extending a taut endless chain equipped with suitable blades and running along a substantially portion of its circumference. mounted over said drive sprocket and at the same time around said sword in the area of the guide available thereon. Said sword is, with the aid of a suitable tensioning mechanism, optionally movable relative to said saw housing at least to the extent that it enables the installation and tensioning or. loosening and removing said chain. Furthermore, a protective cover is provided on said housing, which in the state of readiness of the saw for use extends at least over said drive sprocket and in the area of the housing of the arranged part of the sword.

Po izumu je v kontekstu rešitve uvodoma zastavljenega tehničnega problema predvideno, da je omenjeno pogonsko verižno kolo na svoji vstran od okrova obrnjeni pročelni površini opremljeno z vsaj dvema v obodni smeri omenjenega pogonskega verižnega kolesa simetrično razporejenima rebroma, z debelino, ki štrli od pročelne površine in rebro sega preko oboda verižnega kolesa za vnaprej določeno dolžino. Vsako od omenjenih reber je razporejeno na pročelni površini verižnega kolesa pod kotom, ki ga na eni strani oklepa poltrak, ki poteka iz središča ploskve vsakokratnega rebra, ki nalega na pročelno površino verižnega kolesa, v radialni smeri verižnega kolesa stran od središča pogonskega verižnega kolesa, in na drugi strani poltrak, ki poteka iz središča ploskve vsakokratnega rebra, ki nalega na pročelno površino verižnega kolesa, v vzdolžni smeri vsakokratnega rebra stran od središča pogonskega verižnega kolesa. Pri tem vsako izmed omenjenih reber po eni strani dopušča sodelovanje verižnega kolesa z omenjeno verigo in po drugi strani vsaj deloma sega preko oboda verižnega kolesa. Nadalje je na vsakem izmed omenjenih reber na voljo vsaj en rezalni rob, ki med vrtenjem pogonskega verižnega kolesa zagotavlja rezanje lesenih predmetov v primeru vdora le-teh v neposredno bližino omenjenega pogonskega verižnega kolesa.According to the invention, in the context of the solution of the technical problem posed by the introduction, said drive chain wheel on its front side facing the housing is provided with at least two ribs symmetrically arranged in the circumferential direction of said drive chain wheel, with a thickness protruding from the front surface and the rib extends beyond the circumference of the sprocket for a predetermined length. Each of said ribs is arranged on the front surface of the sprocket at an angle enclosed on one side by a half-strip extending from the center of the surface of the respective rib abutting the front surface of the sprocket in the radial direction of the sprocket away from the center of the sprocket, and, on the other hand, a half-strip extending from the center of the surface of the respective rib abutting the front surface of the sprocket, in the longitudinal direction of the respective rib away from the center of the drive sprocket. In this case, each of said ribs on the one hand allows the chain wheel to cooperate with said chain and on the other hand extends at least in part beyond the circumference of the sprocket. Furthermore, at least one cutting edge is provided on each of said ribs, which ensures the cutting of wooden objects during the rotation of the drive chain wheel in the event of their intrusion into the immediate vicinity of said drive chain wheel.

Pri prednostni izvedbi izuma so predvidena vsaj tri v obodni smeri omenjenega pogonskega verižnega kolesa simetrično razporejena rebra, ki so na pročelni površini verižnega kolesa razporejena pod določenim kotom in ki s svojo dolžino vsaj deloma segajo preko oboda verižnega kolesa.In a preferred embodiment of the invention, at least three symmetrically arranged ribs are arranged symmetrically in the circumferential direction of said drive sprocket, which are arranged at a certain angle on the front surface of the sprocket and which at least partially extend beyond the circumference of the sprocket.

Po izumu je nadalje smotrno, če širina vsakega izmed omenjenih reber na pogonskem verižnem kolesu znaša od 5 do 20 % premera pogonskega verižnega kolesa, debelina vsakega izmed omenjenih reber na pogonskem verižnem kolesu, namreč višina rebra glede na zunanjo površino v aksialni smeri pogonskega verižnega kolesa znaša vsaj od 2 do 10% premera pogonskega verižnega kolesa, dolžina vsakega izmed omenjenih reber znaša od 40 do 75% premera pogonskega verižnega kolesa, razen tega pa vsakokratno rebro sega preko oboda verižnega kolesa za vnaprej določeno dolžino, ki znaša od 2 do 40% premera pogonskega verižnega kolesa. Kot pod katerim je vsako od omenjenih reber razporejeno na pročelni površini verižnega kolesa je med 5 do 30°, pri čemer je v prednostni izvedbi vsakokratno rebro zasukano pod navedenim kotom v nasprotni smeri glede na smer vrtenja verižnega kolesa.According to the invention, it is further expedient if the width of each of said ribs on the drive sprocket is from 5 to 20% of the diameter of the drive sprocket, the thickness of each of said ribs on the drive sprocket, namely the height of the rib relative to the outer surface in the axial direction of the drive sprocket is at least 2 to 10% of the diameter of the drive sprocket, the length of each of said ribs is from 40 to 75% of the diameter of the drive sprocket, in addition, each rib extends beyond the circumference of the sprocket for a predetermined length of 2 to 40% the diameter of the drive sprocket. The angle at which each of said ribs is arranged on the front surface of the sprocket is between 5 and 30 °, wherein in a preferred embodiment each rib is rotated at said angle in the opposite direction with respect to the direction of rotation of the sprocket.

Po izumu je nadalje dopuščena možnost, da pogonski motor predstavlja bodisi motor z notranjim izgorevanjem ali pa električni motor, načeloma pa lahko kakršno koli drugo pogonsko sredstvo, ki zagotavlja vrtenje pogonske gredi s pogonskim verižnim kolesom s primernim navorom in vrtilno hitrostjo.According to the invention, it is further possible for the drive motor to be either an internal combustion engine or an electric motor, but in principle any other drive means can be provided to rotate the drive shaft with a drive chain wheel of suitable torque and rotational speed.

Nadalje obseg predloženega izuma vključuje tudi možnost, da pogonsko verižno kolo motorne žage s prej opisanimi značilnostmi predstavlja rezervni ali nadomestni del za naknadno vgradnjo ali zamenjavo prvotno vgrajenega pogonskega verižnega kolesa, s čimer je možno tudi pri že obstoječi motorni žagi zgolj z zamenjavo pogonskega verižnega kolesa rešiti uvodoma zastavljeni problem.Furthermore, the scope of the present invention also includes the possibility that the chainsaw drive chain with the previously described characteristics is a spare or replacement part for retrofitting or replacing the originally installed drive chain wheel, which is possible with an existing chainsaw only by replacing the drive chain wheel. to solve the problem posed in the introduction.

Izum bo v nadaljevanju obrazložen s primerom izvedbe in v povezavi s priloženo skico, kjer kažeThe invention will be explained below with an example of an embodiment and in connection with the attached sketch, where it shows

Sl. 1 verižno motorno žago v izometriji in z odstranjenim pokrovom okrova,Sl. 1 chainsaw in isometry and with the cover removed,

Sl. 2 žago po Sl. 1 v narisu,Sl. 2 saw according to FIG. 1 in the sketch,

Sl. 3 pa podrobnost A po Sl. 2Sl. 3 and detail A according to FIG. 2

Sl.4 podrobnosti pogonskega verižnega kolesa z rebriFig.4 details of the drive sprocket with ribs

Kot je razvidno na Sl. 1 - 4 verižna motorna žaga po izumu obsega primemo oblikovan okrov 1, na katerem sta na voljo primerni prijemali 11, 12 za rokovanje z žago. V omenjenem okrovu 1 je vgrajen pogonski motor 2 s pogonsko gredjo, ki na skici sicer ni posebej prikazana, na njej pa je vgrajeno pogonsko verižno kolo 20. Žaga nadalje obsega v smeri stran od omenjenega okrova 1 štrleč meč 3, ki je razstavljivo povezljiv z omenjenim okrovom 1 v bližini omenjenega pogonskega verižnega kolesa 20. Omenjeni meč 3 obsega vsaj vzdolž pretežnega dela njegovega oboda potekajoče vodilo 30 za vodenje primemo napete brezkončne verige 4, ki je opremljena s primernimi rezili 40 in nameščena po eni strani preko omenjenega pogonskega verižnega kolesa 20 in po drugi strani okoli omenjenega meča 3 v območju na njem razpoložljivega vodila 30. Omenjeni meč 3 je s pomočjo primernega napenjalnega mehanizma po izbiri premakljiv relativno glede na omenjeni okrov 1 žage vsaj do te mere, da je možno nameščanje in napenjanje oz. popuščanje in odstranjevanje omenjene verige 4. Razen tega je na omenjenem okrovu 1 žage predviden zaščitni pokrov, ki v stanju, pripravljenosti žage za uporabo sega vsaj preko omenjenega pogonskega verižnega kolesa 20 in v območju okrova 1 razporejenega dela meča 3.As can be seen in FIG. 1 - 4, the chainsaw according to the invention comprises a molded housing 1, on which suitable grips 11, 12 for handling the saw are available. In said housing 1 there is a drive motor 2 with a drive shaft, which is not shown separately in the sketch, but on which a drive chain wheel 20 is mounted. The saw further comprises a protruding sword 3 in the direction away from said housing 1, which can be detachably connected to said housing 1 in the vicinity of said drive sprocket 20. Said sword 3 comprises at least a guide guide tensioned endless chain 4 extending along a substantial part of its circumference, guided by suitable blades 40 and mounted on one side via said drive sprocket 20. and on the other hand about said sword 3 in the area of the guide available therein. Said sword 3 is optionally movable relative to said saw housing 1 by means of a suitable tensioning mechanism at least to the extent that it is possible to install and tension or. loosening and removing said chain 4. In addition, a protective cover is provided on said saw housing 1 which, in the state of readiness of the saw for use, extends at least over said drive chain wheel 20 and in the area of housing 1 of the sword part 3.

Omenjeno pogonsko verižno kolo 20 je na svoji vstran od okrova 1 obrnjeni pročelni površini 201 opremljeno z vsaj dvema v obodni smeri omenjenega pogonskega verižnega kolesa 20 simetrično razporejenima in z omenjene površine 201 v smeri vstran od okrova 1 štrlečima rebroma 202. Vsako izmed vsakokrat razpoložljivih reber 202 po eni strani dopušča sodelovanje verižnega kolesa 20 z omenjeno verigo 4 in po drugi strani vsaj deloma sega preko oboda 201' verižnega kolesa 20.Said drive sprocket 20 is provided on its front surface 201 facing away from the housing 1 with at least two in the circumferential direction of said drive sprocket 20 symmetrically arranged and from said surface 201 in the direction away from the housing 1 protruding ribs 202. Each of the available ribs 202 on the one hand allows the chain wheel 20 to engage with said chain 4 and on the other hand extends at least partially beyond the circumference 201 'of the chain wheel 20.

Nadalje je na vsakem izmed omenjenih reber 202 na voljo vsaj en rezalni rob 202', ki med vrtenjem pogonskega verižnega kolesa 20 zagotavlja rezanje lesenih predmetov v primeru vdora le-teh v neposredno bližino omenjenega pogonskega verižnega kolesa 20.Furthermore, at least one cutting edge 202 'is provided on each of said ribs 202, which provides for cutting wooden objects during rotation of the drive chain wheel 20 in the event of their intrusion into the immediate vicinity of said drive chain wheel 20.

Uvodoma naveden tehnični problem je po izumu še zlasti optimalno rešljivi v primeru, kadar je vsako od omenjenih reber 202 razporejeno na pročelni površini 201 verižnega kolesa pod kotom a, ki ga na eni strani oklepa poltrak Tl, ki poteka iz središča S ploskve P vsakokratnega rebra 202, ki nalega na pročelno površino 201 verižnega kolesa 20 v radialni smeri verižnega kolesa 20 stran od središča pogonskega verižnega kolesa 20, in na drugi strani poltrak T2, ki poteka iz središča S ploskve P vsakokratnega rebra 202, ki nalega na pročelno površino 201 verižnega kolesa 20 v vzdolžni smeri vsakokratnega rebra 202 stran od središča pogonskega verižnega kolesa 20.According to the invention, the technical problem mentioned in the introduction is particularly optimally solvable in the case where each of said ribs 202 is arranged on the front surface 201 of a sprocket at an angle a surrounded on one side by a half-strip T1 extending from the center S of the surface P of each rib. 202 abutting the front surface 201 of the sprocket 20 in the radial direction of the sprocket 20 away from the center of the drive sprocket 20, and on the other hand a half-strip T2 extending from the center S of the surface P of each rib 202 abutting the front surface 201 of the sprocket wheels 20 in the longitudinal direction of each rib 202 away from the center of the drive chain wheel 20.

Pri prednostni izvedbi je vsakokratno rebro 202 zasukano pod kotom a v nasprotni smeri glede na smer vrtenja verižnega kolesa 20 in je kot a med 5° in 30°.In a preferred embodiment, the rib 202 is rotated at an angle a in the opposite direction with respect to the direction of rotation of the sprocket 20 and the angle a is between 5 ° and 30 °.

Pri prednostni izvedbi so načeloma predvidena vsaj tri v obodni smeri omenjenega pogonskega verižnega kolesa 20 simetrično razporejena in pod kotom a v nasprotni smeri glede na smer vrtenja verižnega kolesa 20 zasukana ter preko oboda 20Γ omenjenega pogonskega verižnega kolesa 20 segajoča rebra 202.In a preferred embodiment, at least three at least three ribs 202 extending symmetrically in the circumferential direction of said drive sprocket 20 are provided symmetrically arranged at an angle a in the opposite direction to the direction of rotation of the sprocket 20 and over the circumference 20 of said drive sprocket 20.

Pri izvedbi po Sl. 1 - 4 so na voljo štiri rebra 202.In the embodiment according to FIG. 1 - 4 four ribs 202 are available.

Širina B vsakega izmed omenjenih reber 202 na pogonskem verižnem kolesu 20 znaša od 5 do 20% premera D pogonskega verižnega kolesa 20, debelina H vsakega izmed omenjenih reber 202 na pogonskem verižnem kolesu 20, namreč višina vsakokratnega rebra 202 glede na pročelno površino 201 v aksialni smeri verižnega kolesa znaša vsaj od 2 do 10% premera D pogonskega verižnega kolesa 20, dolžina L vsakega izmed omenjenih reber 202 znaša od 40 do 75% premera D pogonskega verižnega kolesa 20, razen tega pa vsakokratno rebro 202 sega preko oboda 201' verižnega kolesa 20 za dolžino Ll, ki znaša od 2 do 40% premera D pogonskega verižnega kolesa 20.The width B of each of said ribs 202 on the drive sprocket 20 is from 5 to 20% of the diameter D of the drive sprocket 20, the thickness H of each of said ribs 202 on the drive sprocket 20, namely the height of each rib 202 relative to the front surface 201 in the axial the direction of the sprocket is at least 2 to 10% of the diameter D of the drive sprocket 20, the length L of each of said ribs 202 is 40 to 75% of the diameter D of the sprocket 20, and the rib 202 extends beyond the circumference 201 'of the sprocket For a length L1 of 2 to 40% of the diameter D of the drive sprocket.

Omenjen pogonski motor 2 prednostno predstavlja bodisi motor z notranjim izgorevanjema ali pa elektromotor, dasiravno je funkcionalnost žage v kontekstu rešitve tehničnega problema možno doseči s katerim koli pogonskim sredstvom 2, ki zagotavlja rotacijo pogonske gredi s pogonskim verižnim kolesom 20 za pogon brezkončne verige 4 z rezili 40. Pri tem velja poudariti, da obseg varstva izuma ni omejen zgolj na motorno žago, marveč vključuje tudi pogonsko verižno kolo 20 s prej opisanimi značilnostmi, in sicer še zlasti v primeru, kadar pogonsko verižno kolo 20 z rebri 202 in rezili 202' predstavlja rezervni ali nadomestni del za naknadno vgradnjo ali pa za zamenjavo prvotno vgrajenega pogonskega verižnega kolesa 20 brez reber 202 in rezil 202' z verižnim kolesom 20 po izumu zaradi izboljšanja funkcionalnosti celotne motorne žage.Said drive motor 2 preferably represents either an internal combustion engine or an electric motor. In addition, the functionality of the saw in the context of solving the technical problem can be achieved by any drive means 2 providing rotation of the drive shaft with the drive chain wheel 20 to drive the endless chain 4 with blades. 40. It should be noted that the scope of protection of the invention is not limited to the chainsaw, but also includes the drive chain wheel 20 with the previously described characteristics, especially in the case where the drive chain wheel 20 with ribs 202 and blades 202 'represents a spare or replacement part for retrofitting or for replacing the originally installed drive chain wheel 20 without ribs 202 and blades 202 'with a chain wheel 20 according to the invention in order to improve the functionality of the entire chainsaw.

Claims

PATENT APPLICATIONS

A chain saw, comprising a grip-shaped housing (1) with suitable grips (11, 12) for handling the saw, and in said housing (1) a drive motor (2) is mounted and a drive shaft on which the drive chain is mounted a wheel (20) as well as a protruding sword (3) in the direction away from said housing (1), which can be removably attached to said housing (1) in the vicinity of said drive chain wheel (20) and comprises a guide extending at least along the majority of its circumference (30) for guiding a suitably tensioned endless chain (4) equipped with suitable blades (40) and mounted on one side via said drive chain wheel (20) and on the other side around said sword (3) in the area of the available guide (30), and said sword (3) is optionally movable relative to said saw housing (1) by means of a suitable tensioning mechanism at least to the extent that it is possible to install and tension it. loosening and removing said chain (4), in addition, a protective cover is provided on said saw housing (1) which, in the state of readiness of the saw for use, extends at least over said drive chain wheel (20) and arranged in the area of the housing (1) part of the sword (3), characterized in that said drive chain wheel (20) is provided with at least two ribs symmetrically arranged in the circumferential direction of said drive chain wheel (20) on its front side facing the housing (1). 202), with a thickness (H) projecting from the front surface (201) and a length (L), at least one cutting edge (202 ') being provided on each of said ribs (202), which during rotation of the drive chain the wheel (20) provides for cutting wooden objects in the event of intrusion into the immediate vicinity of said drive chain wheel (20), each of said ribs (202) being arranged on the front surface (201) of the chain wheel (20) at an angle (a) , which is enclosed on one side a half-strip (T1) extending from the center (S) of the surface (P) of each rib (202) abutting the front surface (201) of the sprocket (20), in the radial direction of the sprocket (20) away from the center of the drive sprocket (20), and on the other hand a half-strip (T2) extending from the center (S) of the surface (P) of each rib (202) abutting the front surface (201) of the sprocket (20), in the longitudinal direction of the respective rib ( 202) away from the center of the drive sprocket (20) and the angle (a) is between 5 ° and 30 °.

Chainsaw according to claim 1, characterized in that the rib (202) is rotated at an angle (a) in the opposite direction with respect to the direction of rotation of the chain wheel (20).

Chainsaw according to claim 1, characterized in that the rib (202) extends at least in part along the circumference (201 ') of the chain wheel (20) in each case,

Chainsaw according to claims 1 to 3, characterized in that the width (B) of each of said ribs (202) on the drive chain wheel (20) is from 5 to 20% of the diameter (D) of the drive chain wheel (20). ), the thickness (H) of each of said ribs (202) on the drive chain wheel (20), namely the height of each rib (202) relative to the outer surface (201) in the axial direction of the chain wheel (20) is at least 2 to 10% the diameter (D) of the drive chain wheel (20), the length (L) of each of said ribs (202) is from 40 to 75% of the diameter (D) of the drive chain wheel (20), in addition each time the rib (202) extends beyond the circumference (20Γ) of the sprocket (20) for a length (L1) of 2 to 40% of the diameter (D) of the drive sprocket (20).

Chain saw saw 1 to 4, characterized in that at least three are provided in the circumferential direction of said drive chain wheel (20) symmetrically arranged and at an angle (a) in the opposite direction with respect to the direction of rotation of the chain wheel (20) twisted ribs (202) extending over the circumference (20Γ) of said drive chain wheel (20).

Chainsaw saw according to any one of claims 1 to 5, characterized in that the drive motor (2) is an internal combustion engine.

Chainsaw saw according to any one of claims 1 to 5, characterized in that the drive motor (2) is an electric motor.

A chainsaw drive chain wheel (202) according to any one of claims 1-7, wherein the drive chain wheel (20) is a spare or replacement part for retrofitting or replacing the originally installed drive chain wheel (20).