SI25685A

SI25685A - Chainsaw

Info

Publication number: SI25685A
Application number: SI201800188A
Authority: SI
Inventors: Rajko Bernik
Original assignee: UNIVERZA V LJUBLJANI BiotehniĹˇka fakulteta
Priority date: 2018-08-24
Filing date: 2018-08-24
Publication date: 2020-02-28

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, radialno navzven potekajočima in z omenjene površine (201) v smeri vstran od okrova (1) štrlečima rebroma (202), izmed katerih vsako po eni strani dopušča sodelovanje verižnega kolesa (20) z omenjeno verigo (4) in po drugi strani vsaj deloma štrli preko oboda (201') verižnega kolesa (20), 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 predmetovv primeru vdora le-teh v neposredno bližino omenjenega pogonskega verižnega kolesa (20).The purpose of the invention is to prevent inadvertent leakage of an endless chain (4) by means of blades (40) from holding with a drive chain wheel (20) during the use of a chainsaw, due to the intrusion of wood residues, especially fine branches and leaves, into the saw blade, namely into the area between said chain (4) and the drive wheel (20). For this purpose, said saw chain drive wheel (20) is provided with at least two circumferentially driven drive chains (20) symmetrically arranged radially outwardly extending from said surface (201) on its side facing side (1) facing the face (201). 201), in the direction away from the housing (1), the projecting ribs (202), each of which on one hand permits the engagement of the chain wheel (20) with said chain (4) and, on the other hand, at least partially protrudes over the circumference (201 ') of the chain wheel (20), wherein at least one cutting edge (202 ') is provided on each of said ribs (202), which, while rotating the drive wheel (20), provides cutting of wooden objects in case of their intrusion into the immediate vicinity of said drive chain wheels (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 corresponding blades, said chain being guided along a suitable guide and driven by a drive 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.Such inventions according to the International Patent Classification fall within the field of processing, and more specifically, the field of woodworking, namely saw blades, namely chainsaws and their accessories.

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 preventing inadvertent leakage of an endless chain from a drive chain wheel by the chain saw due to the intrusion of wood residues, especially fine branches and leaves, into the end of the saw chain, namely into the area between the end chain. and the drive wheel.

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 je 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 žagovina, 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 moto saw is described, inter alia, in EP 0 955 139 A2 and DE 10 2004 021 080 Al. Such a moto saw comprises a housing in which a drive motor is mounted, e.g. an internal combustion engine or an electric motor on which the drive chain is mounted on the output shaft to drive the endless chain. The endless chain is meaningfully similar to a conventional lamella chain and consists of a plurality of mutually interconnected members, and the blades of said members have blades adapted to cut the corresponding material, in this case wood. The chain is mounted on a sword, the circumferential edge of which is adapted to guide the chain, such that the majority of the endless chain rests on said sword, and a certain number of chain members extend beyond said sword and rest on the drive chain wheel adjacent to said sword. The sword is movable with a suitable mechanism and guides to a certain extent with respect to said frame and said drive wheel, thereby providing the possibility of tensioning the chain, as well as the possibility of installing or removing the chain by sharpening the blades or replacing a damaged or worn chain. For safety and aesthetic reasons, a removable cover is provided on the chainsaw housing which is mounted over the drive wheel and over at least the area of the chain guide sword located near said drive wheel to prevent access to rotating parts. and a chain tensioning mechanism, so that only the working area of said sword with an endless chain mounted on it protrudes from the housing and from under the cover. Since, during the operation of the saw, the chain members move at a relatively high speed along the circumference of the said sword, there is a certain gap between the sword with the chain and the saw blade on the one hand, and between the sword with the chain and the bonnet cover, on the other. , especially under the aforementioned cover, smaller pieces of wood, especially sawdust, invade during the pruning or sawing. by barking trees, bark, fine branches and leaves. Sawing a saw does not, in principle, pose a major problem, since it is a smaller particle that normally does not have a significant effect on the interaction between the chain and the drive wheel. The problem occurs when a thin branch penetrates into the area between the hood and the hub, and especially into the area of cooperation between the chain and the drive wheel, which gradually fills the space around the drive wheel and then gets stuck between the drive wheel and the chain, causing the mechanism to tighten the chain it becomes congested, the chain becomes loose and then, due to foreign bodies between it and the chain wheel, it escapes from the resistance with the chain. The problem is, in principle, solvable, but for this purpose it is necessary to stop work, stop the engine, remove the cover from the hood, clean the area around the drive chain wheel under the hood, install the chain back onto the drive wheel, adjust the chain tension, install the hood and restart drive motor. However, the problem becomes unbearably urgent when the aforementioned problem is repeated over and over again after working with a chainsaw, since after a few minutes of using the saw under the hood it accumulates so much foreign matter that this will inevitably lead to the saw being disabled again. This, in addition to the significant decrease in the efficiency of the saw, is also associated with the risk of damage to individual parts due to frequent assembly and disassembly in the field, as well as to the frustration to which the user is exposed in this mode of operation, as well as the possibility of injuries at work, which in the use of a chainsaw 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 a pogonsko gredjo, na kateri je vgrajeno pogonsko verižno kolo. Tovrstna žaga je nadalje obsega v smeri vstran od omenjenega okrova štrleč meč, ki je 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 operating a saw, and in said housing a drive motor with a drive shaft on which a drive chain is mounted. Such a saw further comprises a projecting sword which is removably fastened to said housing near said drive chain wheel in the direction of said housing, and comprises at least along the major portion of its circumference a running guide rail receiving a tension endless chain provided with suitable blades. and mounted over said drive chain wheel and at the same time around said sword in the region of the guide provided therein. Said sword is, by means of a suitable tensioning mechanism, optionally movable relative to said saw blade, at least to the extent that it permits installation and tensioning of the saw. loosening and removing said chain. Further, a protective cover is provided on said housing, which in standby mode of the saw extends at least over said drive chain wheel and within the area of the housing of the disposed sword portion.

Po izumu je v kontekstu rešitve uvodoma zastavljenega tehničnega problema predvideno, daje omenjeno pogonsko verižno kolo na svoji vstran od okrova obrnjeni pročelni površini opremljeno z vsaj dvema v obodni smeri omenjenega verižnega kolesa simetrično razporejenima, radialno navzven potekajočima in z omenjene površine v smeri vstran od okrova štrlečima rebroma. Pri tem vsako izmed omenjenih reber po eni strani dopušča sodelovanje verižnega kolesa z omenjeno verigo in po drugi strani vsaj deloma štrli 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 set forth above, it is provided that said drive chain wheel is provided with at least two symmetrically spaced, circularly extending and radially outwardly extending radially outward and said sideways sides of said chain wheel on its side facing side. ribs protruding. In doing so, each of said ribs on the one hand allows the chain wheel to cooperate with said chain, and on the other hand, at least partially protrudes over the circumference of the chain wheel. Furthermore, at least one cutting edge is provided on each of said ribs, which, while rotating the drive wheel, ensures the cutting of wooden objects in the event of their intrusion into the immediate vicinity of said drive wheel.

Pri prednostni izvedbi izuma so predvidena vsaj tri v obodni smeri omenjenega pogonskega verižnega kolesa simetrično razporejena in radialno navzven potekajoča ter preko oboda omenjenega kolesa štrleča rebra.In a preferred embodiment of the invention, at least three circumferentially driven drive chain wheels are arranged in a circumferential direction and projecting ribs extending radially outward and projecting over the circumference of said wheel.

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 štrli preko oboda verižnega kolesa za vnaprej določeno dolžino, ki znaša od 2 do 40% premera pogonskega verižnega kolesa.According to the invention, it is further advantageous if the width of each of said ribs on the drive chain wheel is from 5 to 20% of the diameter of the drive chain wheel, the thickness of each of said ribs on the drive chain wheel, namely the height of the ribs relative to the outer surface in the axial direction of the drive chain wheel at least 2 to 10% of the diameter of the drive chain, the length of each of said ribs is 40 to 75% of the diameter of the drive chain, except that each rib extends beyond the circumference of the chain wheel for a predetermined length of 2 to 40% drive wheel diameter.

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 permissible for the propulsion engine to be either an internal combustion engine or an electric motor, and in principle any other propulsion means that can provide a drive shaft with a drive chain with a 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 a chainsaw drive motor with the characteristics described above constitutes a spare or replacement part for retrofitting or replacing the originally installed drive chain, which is also possible with an existing chain saw only by replacing the drive chain. to solve the problem posed initially.

Izum bo v nadaljevanju obrazložen s primerom izvedbe in v povezavi s priloženo skico, kjer kažeThe invention will now be explained by way of example and in connection with the accompanying drawing, where it is shown

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

Sl. 2 žago po Sl. 1 v narisu,FIG. 2 is a saw according to FIG. 1 in the outline,

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

Kot je razvidno na Sl. 1 - 3 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 a pogonsko gredjo, ki na skici sicer ni posebej prikazana, na njej pa je vgrajeno pogonsko verižno kolo 20. Žaga nadalje obsega kot tudi v smeri stran od omenjenega okrova 1 štrleč meč 3, ki je razstavljivo povezljiv z omenjenim okrovom 1 v bližini omenjenega pogonskega verižnega kolesaAs can be seen in FIG. 1 to 3 chain saws according to the invention comprise a suitably shaped housing 1, with suitable grips 11, 12 for operating a saw. In said housing 1 there is a drive motor 2 a mounted drive shaft, which is not otherwise shown in the sketch, and there is a drive chain wheel 20. The saw further comprises, as well as in the direction away from said housing 1, a projecting sword 3 which is detachable. connectable to said housing 1 near said drive chain wheel

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 3.20. The said sword 3 comprises, at least along a major portion of its circumference, an extending guide 30 for guiding a tension endless chain 4 provided with suitable blades 40 and positioned on one side over said drive chain wheel 20 and on the other side around said sword 3 in. said guide 30 is optionally movable relative to said saw blade housing 1 at least to the extent that it is possible to mount and tension or allow the said blade 3 to be moved relative to said saw blade 1. loosening and removing said chain 4. In addition, a protective cover is provided on said saw blade 1 which extends, at least when the saw blade is ready for use, through at least said drive chain wheel 20 and in the region of the blade 1 of the sword portion 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, radialno navzven potekajočima 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 štrli preko oboda 201' verižnega kolesa 20.Said drive wheel 20 is provided with at least two in the circumferential direction of said drive chain wheel 20 symmetrically spaced radially outwardly extending from said surface 201 and with projecting ribs 202. On each side of the housing 1 facing side 201. of the available ribs 202, on the one hand, allows the chain wheel 20 to cooperate with said chain 4 and, on the other, at least partially protrude 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 kolesaFurthermore, at least one cutting edge 202 'is provided on each of said ribs 202', which, while rotating the drive chain wheel 20, provides cutting of wooden objects in the event of their intrusion into the immediate vicinity of said drive chain wheel

20.20.

Pri prednostni izvedbi so načeloma predvidena vsaj tri v obodni smeri omenjenega pogonskega verižnega kolesa 20 simetrično razporejena in radialno navzven potekajoča ter preko oboda 201' omenjenega pogonskega verižnega kolesa 20 štrleča rebra 202. Pri izvedbi po Sl. 1 - 3 so na voljo štiri rebra 202.In a preferred embodiment, at least three circumferentially driven drive chain wheels 20 are arranged symmetrically and radially outwardly extending beyond the circumference 201 'of said drive chain wheel 20. In the embodiment of FIG. 1 - 3 four ribs 202 are available.

Uvodoma naveden tehnični problem je po izumu še zlasti optimalno rešljivi v primeru, kadar 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 zunanjo površino 201 v aksialni smeri verižnega kolesa 20, znaša vsaj od 2 do 10% premera D pogonskega verižnega kolesa 20, dolžina L vsakega izmed omenjenih reber 20) znaša od 40 do 75% premera D pogonskega verižnega kolesa 20, razen tega pa vsakokratno rebro 202 štrli preko oboda 201' verižnega kolesa 20 za dolžino Ll, ki znaša od 2 do 40% premera D pogonskega verižnega kolesa 20.The aforementioned technical problem according to the invention is particularly optimally solved when the width B of each of said ribs 202 on the drive 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% of the diameter D of the drive chain wheel 20, the length L of each of said ribs 20) is 40 to 75% of the diameter D the drive wheel 20, moreover, each rib 202 extends beyond the circumference 201 'of the drive wheel 20 for a length Ll of from 2 to 40% of the diameter D of the drive wheel 20.

Omenjen pogonski motor 2 prednostno predstavlja bodisi motor z notranjim izgorevanjem 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.Said drive motor 2 preferably represents either an internal combustion engine or an electric motor; of course, the functionality of the saw in the context of the solution of the technical problem can be achieved with any drive means 2, which provides rotation of the drive shaft with drive chain wheel 20 for drive endless chain 4 with blades 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 in rezili 202' predstavlja rezervni ali nadomestni del za naknadno vgradnjo ali pa za zamenjavo prvotno vgrajenega pogonskega verižnega kolesa 20 brez reber in rezil 202' s kolesom 20 po izumu zaradi izboljšanja funkcionalnosti celotne motorne žage.It should be noted that the scope of the invention is not limited to a chainsaw, but also includes a drive wheel 20 with the characteristics described above, especially when the drive wheel 20 with ribs and blades 202 'is a spare or replacement a part for retrofitting or replacing the originally installed drive chain 20 without ribs and blades 202 'with the wheel 20 according to the invention in order to improve the functionality of the whole chainsaw.

Claims

PATENT APPLICATIONS

A sawmill chain comprising a suitably shaped housing (1) with suitable grips (11, 12) for sawing, and said drive housing (1) having a drive motor (2) and a drive shaft on which a drive chain is mounted a wheel (20) as well as a projecting sword (3) away from said housing (1), which is removably fastened to said housing (1) near said drive chain wheel (20) and comprises at least along the major portion of its circumference a running guide (30) A tension endless chain (4) is provided to guide it, which is provided with suitable blades (40) and is mounted on one side via said drive chain wheel (20) and on the other around said sword (3) within the area available therein. guides (30), and wherein said sword (3) is optionally movable relative to said saw blade 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), and in addition, a protective cover is provided on said saw housing (1) which extends at least over said drive chain wheel (20) and arranged in the region of the housing (1) in the condition of the saw being ready for use. a portion of the sword (3), characterized in that said drive chain wheel (20) is provided symmetrically arranged at least two in the circumferential direction of said drive chain wheel (20) on its side facing side (1) facing the face surface (201); radially outwardly extending ribs (202) extending from said surface (201) in the direction away from the housing (1), each of which on one side permits the engagement of the chain wheel (20) with said chain (4) and on the other hand at least partially protrudes. through the circumference (20 Γ) of the chain wheel (20), with at least one cutting edge (202 ') being provided on each of said ribs (202), which ensures the cutting of wooden objects while rotating the drive chain wheel (20) in the event of their intrusion into the immediate vicinity of said drive chain wheel (20).

Chainsaw according to claim 1, characterized in that at least three circumferentially driven drive chain wheels (20) are arranged symmetrically and radially outwardly extending and protruding ribs (20) through said circumference (20Γ) of said drive chain wheel (20). 202).

Chainsaw according to claim 1 or 2, 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 the respective rib (202) relative to the outer surface (201) in the axial direction of the chain wheel (20) is at least 2 to 10% in diameter (D) of the drive chain wheel (20), the length (L) of each of said ribs (202) ranges from 40 to 75% of the diameter (D) of the drive chain wheel (20), except that each rib (202) protrudes over the circumference ( 20 Γ) of a chain wheel (20) for a length (Ll) of 2 to 40% of the diameter (D) of the drive chain wheel (20).

Chainsaw according to any one of claims 1 to 3, characterized in that the drive motor (2) is an internal combustion engine.

Chain saw according to any one of claims 1 to 3, characterized in that the drive motor (2) is an electric motor.

A chainsaw drive chain (202) according to any one of claims 1-5, wherein the drive chain (20) is a spare or replacement part for retrofitting or replacing the originally installed drive chain (20).