NO20210779A1

NO20210779A1 -

Info

Publication number: NO20210779A1
Application number: NO20210779A
Authority: NO
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-06-20
Also published as: NO346350B1

Description

Patentsøknad II: kneleren Patent application II: the kneeler

Oppfinner og søker: Ulf Tolfsen, Torsnesveien 101, 1634 Gamle Fredrikstad Inventor and applicant: Ulf Tolfsen, Torsnesveien 101, 1634 Gamle Fredrikstad

Tittel: Forbedret håndholdt motorsag. Title: Improved handheld chainsaw.

Innledning Introduction

Den foreliggende oppfinnelsen er en håndholdt motorsag. The present invention is a handheld chainsaw.

Bakgrunn Background

Til å kappe trær ble det tidligere benyttet økser, så overtok lange to hånds blad sager og buesager med tynne oppspente sagblad. Begge fellingsmetodene medførte tungt fysisk arbeid. For noen tiår siden kom imidlertid motorsager inn i bildet. Disse blir også benyttet på skogsmaskiner sammen med store runde sagblad og båndsager, men i denne sammenheng snakker vi om håndholdte sager. Av motoriserte typer er det uten unntak snakk om motoriserte kjedesager med sverd som fører sagkjeden. Praktisk talt alle produsenter benytter klassiske relativt brede sagkjeder med skarpe utstikkende små sagtenner. Med «vik» vil kjedene lage et bredt spor mellom ca.4 og 6 mm. Dette krever mye drivkraft og energibehov. Derfor vil en typisk motorisert kjedesag benytte små bensinmotorer mellom 2 og 4 kW. Slike motorsager er meget støyende og kaster ut mye spon ved skjæring. Eksos fra motoren er forurensende og generende. Ergonomien ved bruk er langt fra optimal og sagene er farlige i bruk. Bruk av verneutstyr er som regel påkrevet. Elektrisk drevne motorsager er tilgjengelig for små modeller, men er uegnet ved bruk i skogsområder langt fra noen strømkilde. Små modeller med 18 - 36 V batteri drift er tilgjengelig, men tappes fort på grunn av det store friksjonstapet ved bruk av et bredt sagkjede som løper med friksjon omkring sagsverdet og i virket. Axes were previously used to cut trees, then long two-handed blade saws and bow saws with thin tensioned saw blades took over. Both felling methods entailed heavy physical work. A few decades ago, however, chainsaws entered the picture. These are also used on forestry machines together with large round saw blades and band saws, but in this context we are talking about hand-held saws. Of the motorized types, it is without exception motorized chainsaws with a bar that guides the saw chain. Practically all manufacturers use classic relatively wide saw chains with sharp protruding small saw teeth. With "bend", the chains will create a wide groove between approx. 4 and 6 mm. This requires a lot of drive and energy. Therefore, a typical motorized chainsaw will use small petrol engines between 2 and 4 kW. Such chainsaws are very noisy and throw out a lot of chips when cutting. Exhaust from the engine is polluting and annoying. The ergonomics during use are far from optimal and the saws are dangerous to use. The use of protective equipment is usually required. Electric powered chainsaws are available for small models, but are unsuitable for use in forested areas far from any power source. Small models with 18 - 36 V battery operation are available, but drain quickly due to the large friction loss when using a wide saw chain that runs with friction around the saw blade and in the wood.

Ett formål med foreliggende oppfinnelse er å frembringe en ny sag er å kunne benytte mindre energi, for eksempel slik at man kan basere den på batteridrift. For å makte dette må betydelig smekrere sagelement som medfører mindre friksjon benyttes, fortrinnsvis et tynt, endeløst sagblad. I en utførelse av foreliggende oppfinnelse kan det benyttes tynne endeløse sagblad fortrinnsvis av tykkelse mellom 0,5 mm - 0,8 mm, med tenner designet for å gå én vei, men som også kan reverseres ved fastkjøring. Man kan da oppnå et smalt kutt som avvirker lite spon i sagemnet, og som gir mindre energitap ved avvirkning. One purpose of the present invention is to produce a new saw that is able to use less energy, for example so that it can be based on battery operation. To be able to do this, a significantly smoother saw element that causes less friction must be used, preferably a thin, endless saw blade. In an embodiment of the present invention, thin endless saw blades can be used, preferably of thickness between 0.5 mm - 0.8 mm, with teeth designed to go one way, but which can also be reversed in the event of jamming. You can then achieve a narrow cut that cuts off little shavings in the sawn material, and which results in less energy loss during cutting.

Kort sammenfatning av oppfinnelsen Brief summary of the invention

Problemer ved den kjente teknikk løses ved hjelp av oppfinnelsen som er en håndholdt motorsag omfattende trekkene i det vedlagte krav 1 og understøttet av de vedlagte tegningenep. Utførelser av oppfinnelsen er angitt i de underordnede patentkravene. Problems with the known technique are solved with the help of the invention, which is a hand-held chainsaw comprising the features of the attached claim 1 and supported by the attached drawings. Embodiments of the invention are specified in the subordinate patent claims.

Figurbeskrivelse Figure description

Fig.1 viser et perspektivriss av den foreliggende oppfinnelsen med gjennomskinnelig ytterskall. Fig.1 shows a perspective view of the present invention with a translucent outer shell.

Fig.2 viser et perspektivriss av den foreliggende oppfinnelsen anvendt for å kutte et tre. Fig.2 shows a perspective view of the present invention used to cut a tree.

Fig.3 viser et perspektivriss av den foreliggende oppfinnelsen hvor et øvre deksel er tatt bort, og hvor et trinsesystem montert på en to-armet hovedramme spenner ut et endeløst sagblad som vris mellom et fortrinnsvis horisontalt leie i arbeidsområdet for sagbladet, til en hovedsakelig vertikal stilling rundt et drijvhjul på bakrammen. Fig.3 shows a perspective view of the present invention where an upper cover has been removed, and where a pulley system mounted on a two-arm main frame spans an endless saw blade which twists between a preferably horizontal bearing in the working area of the saw blade, to a mainly vertical position around a drive wheel on the rear frame.

Beskrivelse av utførelser av oppfinnelsen. Description of embodiments of the invention.

Oppfinnelsen frembringer en håndholdt motorsag omfattende følgende trekk: The invention produces a handheld chainsaw comprising the following features:

- Den har en generelt U-formet hovedramme (1) med en høyre arm (1H) og en venstre arm (1V) og med en mellomliggende bakramme (1B). - It has a generally U-shaped main frame (1) with a right arm (1H) and a left arm (1V) and with an intermediate back frame (1B).

- Hovedrammens (1) fremre åpning (1A) mellom høyre og venstre armer (1H, 1V) samt armenes (1H, 1V) lengde er innrettet til å spenne over og romme en diameter av en trestamme eller emne som felles, se Fig.2 som indikerer snittflaten i en kappet trestamme. Diameteren av trestammen kan være for eksempel opp til over 20 cm. - The front opening (1A) of the main frame (1) between the right and left arms (1H, 1V) as well as the length of the arms (1H, 1V) is designed to span over and accommodate a diameter of a tree trunk or workpiece as common, see Fig.2 which indicates the cut surface in a felled tree trunk. The diameter of the tree trunk can be, for example, up to over 20 cm.

- Hovedrammen (1) er utstyrt med et trinsesystem (10, 11, 20, 21, 30) innrettet til å føre et endeløst sagblad (40) rundt på hovedrammen (1) og i et flattliggende, horisontalt arbeidsområde (40A) som strekker seg tvers over den fremre åpningen (1A), se Fig.3. Vi skriver "flattliggende, horisontalt arbeidsområde" fordi man betrakter det slik under normal trefelling, de fleste trær har stort sett vertikale stammer, og i andre tilfeller må man regne snittflaten i forhold til treets orientering. Merk at motorsagen også kan kløyve og kappe i ønsket retning i veden. - The main frame (1) is equipped with a pulley system (10, 11, 20, 21, 30) designed to guide an endless saw blade (40) around the main frame (1) and in a flat, horizontal working area (40A) extending across the front opening (1A), see Fig.3. We write "flat-lying, horizontal working area" because it is considered as such during normal tree felling, most trees have mostly vertical trunks, and in other cases the cut area must be calculated in relation to the orientation of the tree. Note that the chainsaw can also split and cut in the desired direction in the wood.

- Sagbladets arbeidsområde (40A) strekker seg mellom en venstre trinse (10) ved en ytre ende av venstre arm (1V) og en høyre trinse (11) ved en ytre ende av høyre arm (1H), se Fig.1 og 3. - The saw blade's working area (40A) extends between a left pulley (10) at an outer end of the left arm (1V) and a right pulley (11) at an outer end of the right arm (1H), see Fig.1 and 3.

- Bakrammen (1B) er utstyrt med i det minste én drivtrinse (30) drevet av en motor (50) , og hvor drivtrinsen (30) har en tilnærmet vertikal akse (51), regnet under normal trefelling, eller tilnærmet vinkelrett på det flattliggende, horisontale arbeidsområdet (40A). Ved andre orienteringer av emnet som skal kuttes vil altså arbeidsområdet ligge omtrent vinkelrett på drivtrinsens akse. - The rear frame (1B) is equipped with at least one drive pulley (30) driven by a motor (50), and where the drive pulley (30) has an approximately vertical axis (51), calculated under normal tree felling, or approximately perpendicular to the flat , horizontal working area (40A). In other orientations of the workpiece to be cut, the working area will therefore lie roughly perpendicular to the axis of the drive pulley.

- I denne utførelsen av oppfinnelsen har den venstre og høyre arm (1V, 1H) hver en knekket form med det vi kaller en overarm (1HO, 1VO) nærmere bakstykket med motoren, og underarm ( 1VU, 1HU) tilstøtende arbeidsområdet, og utstyrt med hver sin albutrinse (20, 21) ved armenes "albu", altså knekken mellom overarm og underarm, se Fig.1 og 3. - In this embodiment of the invention, the left and right arms (1V, 1H) each have a bent shape with what we call an upper arm (1HO, 1VO) closer to the rear part with the engine, and lower arm (1VU, 1HU) adjacent to the work area, and equipped with each an albutrinse (20, 21) at the "elbow" of the arms, i.e. the bend between the upper arm and forearm, see Fig.1 and 3.

- Albutrinsen (20, 21) er innrettet til å vende sagbladet (40) ved albuen i sagbladets bane mellom henholdsvis den venstre trinsen (10) og drivtrinsen (30), og den høyre trinsen (11) og drivtrinsen (30). - The elbow pulley (20, 21) is designed to turn the saw blade (40) at the elbow in the path of the saw blade between the left pulley (10) and the drive pulley (30), and the right pulley (11) and the drive pulley (30), respectively.

I en utførelse av oppfinnelsen er albutrinsen (20, 21) plassert hovedsakelig midtveis mellom henholdsvis venstre trinse (10) og drivtrinsen (30), og høyre trinse (11) og drivtrinsen (30). In one embodiment of the invention, the albuter pulley (20, 21) is placed mainly midway between the left pulley (10) and the drive pulley (30), and the right pulley (11) and the drive pulley (30), respectively.

En fordel ved å ha albutrinsen plassert hovedsakelig midtveis mellom trinsen (10) og drivtrinsen (30), og likedan på motsatt side, er at man får en relativt lang strekning å vri det endeløse sagbladet (40) over, slik at man forhindrer eller forebygger utmatting fordi man reduserer lokal vridning av sagbladet (40) per lengdeenhet, altså at man fordeler vridningen over et lengre område. Plassering lenger fremme nær den venstre eller høyre trinsen (10, 11) vil gi mer vridning over en kortere avstand, og tilsvarende for plassering lenger bak i retning drivtrinsen (30). An advantage of having the albuter pulley located mainly midway between the pulley (10) and the drive pulley (30), and similarly on the opposite side, is that you get a relatively long stretch to turn the endless saw blade (40) over, so that you prevent or prevent fatigue because local twisting of the saw blade (40) per unit length is reduced, i.e. twisting is distributed over a longer area. Positioning further forward near the left or right pulley (10, 11) will give more twist over a shorter distance, and correspondingly for positioning further back in the direction of the drive pulley (30).

I en utførelse av oppfinnelsen strekker den høyre og venstre overarmen (1HO, 1VO) seg fremover fra bakstykket (1B) med en horisontal åpningsvinkel på mellom 0 og 80 grader, mens høyre og venstre underarm (1HU, 1VU) er tilnærmet vertikale. In one embodiment of the invention, the right and left upper arms (1HO, 1VO) extend forward from the back piece (1B) with a horizontal opening angle of between 0 and 80 degrees, while the right and left lower arms (1HU, 1VU) are approximately vertical.

En fordel ved at den høyre og venstre overarm (1HO, 1VO) strekker seg fremover med en horisontal åpningsvinkel på mellom 0 og 80 grader er at jo mer armene spriker, jo mindre vridning gis på sagbladet (40). En fordel ved at høyre og venstre underarm (1HU, 1VU) er tilnærmet vertikale er at det oppstår en passasje både på tvers av sagbladets plan, og samtidig på langs med sagbladets plan, og da kan motorsagen også brukes til å splitte et liggende bord eller en liggende stokk på langs i et horisontalt snitt. Dette gir en allsidighet for motorsagen. An advantage of the right and left upper arms (1HO, 1VO) extending forward with a horizontal opening angle of between 0 and 80 degrees is that the more the arms spread, the less twist is given to the saw blade (40). An advantage of the right and left forearms (1HU, 1VU) being nearly vertical is that a passage occurs both across the plane of the saw blade, and at the same time along the plane of the saw blade, and then the chainsaw can also be used to split a lying table or a log lying lengthwise in a horizontal section. This gives the chainsaw versatility.

I en utførelse av oppfinnelsen er albutrinsen (20, 21) orientert i albupartiet slik at sagbladet (40) løper parallelt med over- og underarmen (1VO, 1HO, 1VU, 1HU). Med andre ord, albutrinsen (20, 21) er plassert flattliggende i forhold til et plan dannet av over- og underarmen (1HO, 1VO), resp. (1VO, 1VU) hvor det endeløse sagbladet løper inni. In one embodiment of the invention, the elbow washer (20, 21) is oriented in the elbow section so that the saw blade (40) runs parallel to the upper and lower arm (1VO, 1HO, 1VU, 1HU). In other words, the albutrin (20, 21) is placed flat in relation to a plane formed by the upper and lower arm (1HO, 1VO), resp. (1VO, 1VU) where the endless saw blade runs inside.

I en utførelse av oppfinnelsen er motoren (50) en elektromotor, fortrinnsvis drevet av et elektrisk batteri tilknyttet hovedrammen (1), fortrinnsvis innkapslet i bakrammen (1B). Alternativt, for å få ned vektbelastningen på brukerens armer kan batteriet være innrettet til å anbringes for eksempel på brukerens rygg i en bæresele, og tilknyttet via bakrammen til motoren via en frakoblbar elektrisk forbindelsesledning. In one embodiment of the invention, the motor (50) is an electric motor, preferably driven by an electric battery connected to the main frame (1), preferably enclosed in the rear frame (1B). Alternatively, in order to reduce the weight load on the user's arms, the battery can be arranged to be placed, for example, on the user's back in a carrier, and connected via the rear frame to the motor via a detachable electrical connection cable.

Forsøk med en prototyp av motorsagen ifølge oppfinnelsen bruker en elektrisk motor (50) på 300 W for å drive drivtrinsen (30), og snittet ved felling av en trestamme med diameter ca.15 cm ble smalt og rett og etterlot betydelig mindre og finere spon enn tilsvarende snitt i samme stamme gjort med vanlig bensindrevet "sverd"-motorsag. Det smale sagbladet i foreliggende oppfinnelse reduserer altså energiforbruket, den påkrevde motorkraften, sponavvirkningen og støyen betydelig i forhold til en ordinær sverd- motorsag. Tests with a prototype of the chainsaw according to the invention use an electric motor (50) of 300 W to drive the drive pulley (30), and the cut when felling a tree trunk with a diameter of about 15 cm was narrow and straight, leaving significantly smaller and finer chips than equivalent cuts in the same trunk made with a regular petrol-powered "sword" chainsaw. The narrow saw blade in the present invention thus significantly reduces the energy consumption, the required engine power, the chip removal and the noise compared to an ordinary chainsaw.

I en ytterligere alternativ utførelse av oppfinnelsen er motoren (50) i den håndholdte motorsagen en forbrenningsmotor i hovedrammen (1), fortrinnsvis innkapslet i bakrammen (1B), slik at den kan anvendes på steder hvor man ikke har adgang til elektrisk energi. In a further alternative embodiment of the invention, the motor (50) in the hand-held chainsaw is a combustion engine in the main frame (1), preferably enclosed in the rear frame (1B), so that it can be used in places where there is no access to electrical energy.

I en utførelse av oppfinnelsen er det anordnet trust-trinser 61 og 62 ved trinsene (10, 11) og innrettet til å ligge an mot sagbladets (40) bakkant. In one embodiment of the invention, trust pulleys 61 and 62 are arranged at the pulleys (10, 11) and arranged to rest against the rear edge of the saw blade (40).

Claims

Patent claims

1. A handheld chainsaw comprising the following features:

- a generally U-shaped main frame (1) with a right arm (1H) and a left arm (1V) and with an intermediate rear frame (1B),

- where the front opening (1A) of the main frame (1) between the right and left arms (1H, 1V) as well as the length of the arms (1H, 1V) is arranged to span over and accommodate a diameter of a tree trunk or blank as common,

- where the main frame (1) is equipped with a pulley system (10, 11, 20, 21, 30) designed to guide an endless saw blade (40) around the main frame (1) and in a flat, horizontal working area (40A) under normal operation when felling wood, across the front opening (1A),

- where the saw blade's working area (40A) extends between a left pulley (10) at an outer end of the left arm (1V) and a right pulley (11) at an outer end of the right arm (1H),

- where the rear frame (1B) is equipped with at least one drive pulley (30) driven by a motor (50), and where the drive pulley (30) has an approximately vertical axis (51) approximately perpendicular to the flat, horizontal working area (40A) ,

- where the left and right arms (1V, 1H) each have a bent shape with an upper arm (1HO, 1VO) and lower arm (1VU, 1HU), and each equipped with an albuter ring (20, 21) at the arms' knuckles,

- where the albuter pulley (20, 21) is arranged to turn the saw blade (40) between the left pulley (10) and the drive pulley (30), and the right pulley (11) and the drive pulley (30), respectively.

2. The chainsaw according to claim 1, where the albuter pulley (20, 21) is placed midway between the left pulley (10) and the drive pulley (30), and the right pulley (11) and the drive pulley (30), respectively.

3. The chainsaw according to claim 1, where the right and left upper arms (1HO, 1VO) extend forward from each end of the back piece (1B) with a horizontal opening angle of between 0 and 80 degrees, while the right and left lower arms (1HU, 1VU ) are approximately vertical.

4. The chainsaw according to any of the preceding claims, where the elbow pulley (20, 21) is oriented in the elbow section so that the saw blade (40) runs parallel to the upper and lower arm (1VO, 1HO, 1VU, 1HU).

5. The handheld chainsaw according to claims 1 - 4,

- where the motor (50) is an electric motor, preferably powered by an electric battery connected to the main frame (1), preferably enclosed in the rear frame (1B),

6. The handheld chainsaw according to claims 1 - 4,

- where the engine (50) is an internal combustion engine in the main frame (1), preferably enclosed in the rear frame (1B).

7. The hand-held chainsaw according to any of the preceding claims, where trust pulleys 61 and 62 are arranged at the pulleys (10, 11) and arranged to rest against the rear edge of the saw blade (40).

OLD TEXT

We refer to Fig 3. This shows the rigid main frame (Ia, U). The chainsaw, which is preferably hand-held, includes the following main features:

The U-shaped main frame (U) has a right arm (H, Ia) and a left arm (V), and with an intermediate back piece (B). These are in one embodiment made in one continuous piece.

The main frame's (U) opening is designed to accommodate, i.e. span the diameter of, a tree trunk or joint. The main frame (U) is equipped with a pulley system (L1, L2, IIIb, IIId, IIIc, IIIa) designed to guide an endless saw blade (II), see Fig.3.

The saw blade (II) has a continuous working area (IIa) which extends between the right main guide pulley (IIIc) and the left main guide pulley (IIId) arranged respectively. at the far end of the opening between the right arm (H) and the left arm (V). In the version shown in Fig. III, it has a stopper (S) sticking forward in front of the right arm (H) so that the running toothing on the working area pulls the tree trunk towards the stopper.

The front end of the right arm (H) is equipped with a right front pulley (IIIa).

The front end of the left arm (V) is equipped with a left front pulley (IIIb).

The rear part (B) in the version shown is equipped with at least one motorized pulley (L2), here shown at the back of the left arm (V), and which is driven by a motor (M), and preferably a second pulley (L1) , here at the back of the right arm (H), but in one embodiment of the invention there can be only one pulley in the rear part. In this embodiment, the motorized pulley (L2), the left front pulley (IIIb), and the right front pulley (IIIa), as well as the right rear pulley, lie in one and the same first plane with a first axis direction orthogonal to this plane so that the first axis direction is parallel to the axes of the four aforementioned pulleys. We call the part of the endless saw blade that runs over these pulleys the "return loop".

The right main steering pulley (IIIc) and the left main steering pulley (IIId) lie in a common second plane with a second axis direction for the pulleys (IIIc, IIId), where the first and second axis directions form an angle (v) between 15 and 50 degrees,

- where the working part (IIa) of the saw blade (II) between the right main guide pulley (IIIc) and the left main guide pulley (IIId) is continuously twisted by an angle (v) so that the axial direction of the working area (IIa) forms the angle (v) with the first axis direction.

An advantage is that the working area (IIa) is twisted down to the angle (v) so that the main frame can be twisted down with the angle (v) so that the working area (IIa) lies mainly flat and can cut horizontally into the vertical tree trunk. In other words, the return loop is guided behind the log being cut, while the saw blade gets to work straight into the log. Therefore, the return loop must also at least run to an extent equivalent to more than the tree's diameter backwards in the horizontal plane seen in relation to the horizontal saw blade. This consideration applies in relation to the vertical tree trunk and horizontal cutting working area for the saw blade (IIa), for other directions of the tree trunk, the consideration must of course be evaluated in relation to this.

Another advantage is that the angle (v) is not straight, means that the saw blade (2) is not bent unnecessarily much, and is thus less stressed than if it were to turn 90 degrees in relation to the orientation it has in the return loop.

A third advantage is that the angle (v) is not straight, which means that you can also split logs and boards because the return loop will run a distance outside the log. (At V=45 degrees, this is the same for cutting and splitting.)

When the saw blade is laid flat, the main frame will be angled upwards, in a version between 45 and 50 degrees, i.e. corresponding to a 45 degree twist of the saw blade (IIa) in relation to the main frame. On each side of the saw blade's working area (IIa), out on the arms (H, V), there is a pulley (IIIa) and (IIIb), angled at an angle (v) in relation to the saw blade's working area (IIa). In order for the saw blade's working area (IIa) to cut horizontally, the blade is turned 45 degrees over a given distance on each side of the working area using the main guide pulleys (IIIc) and (III)d. In one embodiment of the invention, the rotation of the blade will be forcibly controlled with the smaller guide pulleys (IIIc1) and (IIId1). To support the blade at the trailing edge, i.e. to give forward thrust on the blade to cut, the trust pulleys (T1) and (T2) will be used, which lie against the trailing edge of the saw blade. Further back are one or two guide pulleys L1 and L2. In L2 is the drive motor as explained above. Between these pulleys sits a tension pulley (X), which can of course be located elsewhere in the return loop. In one embodiment of the invention, the main frame (U) comprises a split protective cover where the right and left arms (H, V) comprise hand grips. The endless saw blade thus runs inside the protective cover.