DK174427B1

DK174427B1 - Handheld, motor driven work-tool

Info

Publication number: DK174427B1
Application number: DK200000528A
Authority: DK
Inventors: Gert LASSEN
Original assignee: Gert LASSEN
Priority date: 2000-03-29
Filing date: 2000-03-29
Publication date: 2003-02-24
Also published as: DK200000528A

Abstract

A handheld work-tool, which has one or more rotating working elements (1), and is coupled to a motor (5) via a gear (4), and is, furthermore, designed with one or more gripping elements (2), which can engage the object or material to be worked upon, and is affected by a torque M3, which is contra flow and lower than, or equal to, the torque M2 applied to the working elements. The work-tool is easy to control, handles and works effectively.<IMAGE>

Description

-1- DK 174427 B1 BESKRIVELSE.-1- DK 174427 B1 DESCRIPTION.

Den foreliggende opfindelse omhandler et arbejdsredskab af den i indledningen til krav 1 omhandlede art.The present invention relates to a working tool of the kind referred to in the preamble of claim 1.

5 Der findes arbejdsredskaber i form af havefræsere af forskellig type. Ved en type roterer arbejdsorganeme i arbejdsstillingen om en lodret akse. Ved en anden type roterer arbejdsorganeme om en vandret akse. Det er en ulempe ved den første type, at der skal holdes igen på redskabet i forskellige retninger for at opnå en effektiv fræsning. Ved den anden type trækker arbejdsorganeme redskabet 10 fremad i fræseretningen, og også her skal der udøves en betydelig modsat rettet kraft på redskabet for at opnå et tilfredsstillende resultat.5 Work tools are available in the form of garden cutters of different types. In one type, the working members rotate in the working position about a vertical axis. In another type, the working members rotate about a horizontal axis. It is a disadvantage of the first type that the tool has to be held in different directions again in order to achieve efficient milling. In the second type, the working members pull the implement 10 forward in the milling direction, and here too, a considerable opposite directed force must be exerted on the implement to achieve a satisfactory result.

Fra fransk patentskrift nr. 1.236.119 kendes en havefræser, der omfatter et sæt roterende arbejdsorganer og et sæt roterende holdeorganer, der roterer i modsat retning om den samme akse og drives af en motor gennem et gear.French Patent Specification No. 1,236,119 discloses a garden cutter comprising a set of rotary working members and a set of rotating holding means rotating in the opposite direction about the same axis and driven by a motor through a gear.

15 Det er en ulempe ved denne kendte fræser, at drivakselen er vinkelret eller tilnærmelsesvis vinkelret på rotationsaksen for arbejds- og holdeorganerne.It is a disadvantage of this known cutter that the drive shaft is perpendicular or approximately perpendicular to the axis of rotation of the working and holding means.

Motoren og fræseren er udformet som to særskilte enheder, og kraftoverføringen fra motor til fræser sker gennem en fleksibel aksel. Gearet består af koniske tandhjul med en lille udveksling. Der skal derfor enten anvendes en kraftig motor, 20 eller gearet bliver tilsvarende stort og tungt. Denne kendte fræser er derfor besværlig at anvende og dyr at fremstille.The motor and the cutter are designed as two separate units, and the transfer of power from the motor to the cutter takes place through a flexible shaft. The gear consists of tapered gears with a small gear. Therefore, either a powerful engine must be used, 20 or the gear will be correspondingly large and heavy. This known cutter is therefore difficult to use and expensive to manufacture.

Det er formålet med den foreliggende opfindelse at anvise et arbejdsredskab, der ikke har ulemperne ved de kendte redskaber.It is the object of the present invention to provide a working tool which does not have the disadvantages of the known tools.

Dette opnås ved at udforme arbejdsredskabet som angivet i den kendetegnende 25 del af krav 1. Herved opnås, at motor og fræser kan opbygges som en enhed.This is achieved by designing the working tool as set forth in the characterizing part of claim 1. Hereby it is achieved that the motor and cutter can be constructed as a unit.

-2- DK 174427 B1-2- DK 174427 B1

Endvidere kan der opnås stor udveksling i gearet, og motoren kan derfor gøres tilsvarende mindre.Furthermore, great gearing can be achieved in the gear, and the engine can therefore be reduced accordingly.

Opfindelsen skal forklares nærmere i det følgende under henvisning til tegningen, 5 på hvilken fig. 1 viser, set i perspektiv og i delvist snit, et arbejdsradskab ifølge opfindelsen, der er udformet som en havefræser, hvor arbejds- og holdeorganeme roterer om en lodret akse i arbejdsstillingen, 10 fig. 2 viser et lodret snit gennem den i fig. 1 viste havefræser, .1 fig. 3 viser et vandret snit efter linien l-l i fig. 2, fig. 4 viser i perspektiv og i split-view et gear til et arbejdsredskab ifølge opfindelsen, fig. 5 viser i perspektiv et arbejdsredskab ifølge opfindelsen i form af en anden 15 type havefræser, hvor arbejds- og holdeorganeme roterer om en vandret akse, fig. 6 viser et snit gennem den i fig. 5 viste fræser, og fig. 7 viseret arbejdsredskab ifølge opfindelsen, der er udformet som en blenderThe invention will be explained in more detail below with reference to the drawing, in which 1 shows, in perspective and in partial section, a working tool according to the invention, which is designed as a garden cutter in which the working and holding means rotate about a vertical axis in the working position; FIG. 2 shows a vertical section through the embodiment of FIG. 1 garden cutter, FIG. 3 is a horizontal sectional view taken along line 1--1 of FIG. 2, FIG. Figure 4 is a perspective view of a gear for a working tool according to the invention in perspective and in split view; Figure 5 is a perspective view of a working tool according to the invention in the form of another type of garden cutter, the working and holding means rotating about a horizontal axis; 6 is a sectional view of the one shown in FIG. 5, and FIG. 7 illustrates a working tool according to the invention, which is designed as a blender

Som vist på fig. 1 og 2 kan et arbejdsredskab ifølge opfindelsen være en 20 havefræser, der er udformet med et antal roterende arbejdsorganer 1 og et antal holdeorganer 2.As shown in FIG. 1 and 2, a working tool according to the invention may be a garden cutter, which is formed with a number of rotating working members 1 and a number of holding means 2.

Arbejdsiorganeme roterer om en i arbejdsstillingen lodret eller tilnærmelsesvis lodret akse c-c.The working members rotate about a vertical axis or approximately vertical axis c-c.

-3- DK 174427 B1-3- DK 174427 B1

Arbejdsorganerne er monteret på en aksel 3, der er koblet til udgangsenden af et planetgear 4, hvis indgangsende er koblet til en motor 5. Gearet består af et antal trin 6, 7 og 8.The working members are mounted on a shaft 3 coupled to the output end of a planetary gear 4 whose input end is coupled to a motor 5. The gear unit consists of a plurality of steps 6, 7 and 8.

5 Som vist på fig. 3 og 4 består hvert trin i et planetgear 4 af et centralt tandhjul 9, der er i indgreb med et antal mellemhjul 10, der er drejeligt monteret på aksler 11, der er fast monteret på en cirkulær skive 12, til hvilken der på den til akslerne modstående side - i trin 6 og 7 - er monteret en centralt tandhjul 9. På skiven 12 i det sidste trin 8 er der monteret en udgangsaksel 3. Mellemhjulene 10 i det sidste 10 trin er i indgreb med en tandkrans 13, der er koblet til en muffe 14, på hvilken der forneden er monteret en skærm 15, på hvis underside hoideorganerne 2 er monteret. Som vist på fig. 2 er akselen 3 og gearet 4 er ophængt i kuglelejer 16 og 17, og muffen 14 er ophængt i kuglelejet 16 og i et kugleleje 18. Motor, gear, lejer og aksler er ophængt i et hus 19 med en skrå arm 20 for et ikke vist håndtag.5 As shown in FIG. 3 and 4, each step of a planetary gear 4 consists of a central sprocket 9 which engages a plurality of center wheels 10 pivotally mounted on shafts 11 fixedly mounted on a circular disc 12 to which the opposite side of the shafts - in steps 6 and 7 - is mounted a central sprocket 9. On the disc 12 in the last step 8 an output shaft 3 is mounted. The intermediate wheels 10 in the last 10 steps are engaged by a gear ring 13 which is coupled to a sleeve 14 on which a screen 15 is mounted at the bottom, on which the underside of the hoist means 2 is mounted. As shown in FIG. 2, the shaft 3 and the gear 4 are suspended in ball bearings 16 and 17 and the sleeve 14 is suspended in the ball bearing 16 and in a ball bearing 18. The motor, gear, bearings and shafts are suspended in a housing 19 with an inclined arm 20 for a non-bearing shown handle.

15 Som vist roterer arbejdsorganeme 1 og hoideorganerne 2 om samme omdrejningsakse c-c.As shown, the working members 1 and the hoisting means 2 rotate about the same axis of rotation c-c.

På fig. 4 er angivet omdrejningstal n og drejningsmomenter M ved indgangsaksel og udgangsaksler i gearet.In FIG. 4, the rpm and torque M are indicated at the input shaft and output shafts of the gear unit.

Dersom gearet har en udveksling på 80:1, og motoren 5 har en effekt på 500 W 20 og et omdrejningstal på 24000 o/m, fås et drejningsmoment Mi på motorens udgangsaksel 5’, der er bestemt ved 2 x 24000 x Mi /60 = 500, hvoraf fås Mi = 0,2 Nm, M2 = 80 x 0,2 = 16 Nm, n2 =300 o/m, 25 M3 = 16-0,2 = 15,8 Nm, og n3 =300 o/m.If the gear has a gear ratio of 80: 1 and the motor 5 has a power of 500 W 20 and a speed of 24000 rpm, a torque Mi is obtained on the output shaft 5 'of the motor determined at 2 x 24000 x Mi / 60 = 500, of which Mi = 0.2 Nm, M2 = 80 x 0.2 = 16 Nm, n2 = 300 rpm, 25 M3 = 16-0.2 = 15.8 Nm, and n3 = 300 rpm m.

Dersom arbejdsorganeme 1 stoppes i deres bevægelse af et fremmedlegeme, vil hoideorganerne 2 begynde at rotere.If the working members 1 are stopped in their movement by a foreign body, the hoisting means 2 will start to rotate.

DK 174427 B1 -4- På fig. 5 og 6 er vist en anden type havefræser, hvor arbejdsorganerne roterer om en vandret akse. En motor 5 er koblet til et centralt tandhjul 9 i et første trin 6 i et planetgear 4. Et centralt tandhjul 9 i det sidste trin 8 i gearet er koblet til en tromle, 5 der består af et rør 21 med et cirkelringformet endestykke 22 ved hver ende.DK 174427 B1 -4- In FIG. 5 and 6, another type of garden cutter is shown in which the working members rotate about a horizontal axis. A motor 5 is coupled to a central sprocket 9 in a first stage 6 of a planetary gear 4. A central sprocket 9 in the last stage 8 of the gear is coupled to a drum 5 consisting of a tube 21 with a circular end piece 22 at each end.

Mellem endestykkerne 22 er der monteret arbejdsorganer 1. Mellemhjulene 10 i det sidste trin 8 er koblet til en tandkrans 13, der er koblet til en muffe 23, der ved enden er ført over i en cirkelringformet skive 24. Ved den modstående ende er 10 fræseren udformet med en anden cirkelringformet skive 25. Mellem skiverne 24 og 25 er der monteret holdeorganer 2, fig. 5.Between the end pieces 22, working means 1 are mounted. The intermediate wheels 10 in the last step 8 are coupled to a gear ring 13 which is coupled to a sleeve 23 which is passed at the end into a circular disc 24. At the opposite end, the cutter 10 formed with a second circular annular disc 25. Between the discs 24 and 25 are retaining members 2, fig. 5th

Røret 21 med skiverne 22, muffen 23 med skiven 25 og skiven 24 er drejeligt ophængt på en cirkelringformet muffe 26 ved den ene ende og 27 ved den anden 15 ende af fræseren. Som vist på fig. 5 er der monteret en gaffel 28 drejeligt i mufferne 26 og 27. Til gaflen 28 er der monteret arme 29 for et ikke vist håndtag.The tube 21 with the washers 22, the sleeve 23 with the washer 25 and the washer 24 is pivotally suspended on a circular annular sleeve 26 at one end and 27 at the other end of the cutter. As shown in FIG. 5, a fork 28 is rotatably mounted in the sleeves 26 and 27. To the fork 28, arms 29 are mounted for a handle not shown.

Som vist roterer også her arbejdsorganerne 1 og holdeorganeme 2 om samme akse c-c.Here, as shown, the working means 1 and the holding means 2 also rotate about the same axis c-c.

På fig. 7 er vist et tredie eksempel på et arbejdsredskab ifølge opfindelsen. Dette 20 arbejdsredskab er udformet som en blender med arbejdsorganer 1 og holdeorganer 2,In FIG. 7 is a third example of a working tool according to the invention. This working tool is designed as a blender with working means 1 and holding means 2,

De viste og beskrevne arbejdsredskaber skal kun tjene til at anskueliggøre opfindelsen. Der kan inden for opfindelsens rammer tænkes forskellige modifikationer. Således kan arbejdsorganer og holdeorganer rotere om hver sin 25 akse, og andre geartyper end planetgear kan tænkes anvendt. Endvidere kan holdeorganeme tænkes anvendt som arbejdsorganer.The work tools shown and described are intended only to illustrate the invention. Various modifications may be envisaged within the scope of the invention. Thus, working means and retaining means can rotate about their axis 25, and gear types other than planetary gear may be used. Furthermore, the holding means may be used as working means.

Claims

-5- DK 174427 B1 REQUIREMENTS. Work tool, for example, a garden cutter comprising a set of rotary working members (1) and a set of rotating holding means (2) rotating in the opposite direction about the same axis and driven by a motor (5) through a gear (4), characterized the gear (4) being designed as a planetary gear consisting of a plurality of steps (6,7,8), each consisting of a central sprocket (9) engaged by a plurality of center wheels (10), rotatably mounted on shafts (11) driving a circular disc (12), to which the sprocket (9) in steps (6) and (7) is mounted on the side opposite to the shafts (11) ), which intermediate wheels (10) in the last step (8) are engaged by a gear (13) and wherein the central gear (9) in the first step (6) is coupled to the drive shaft (5) of the motor (5) ), and the central sprocket (9) in the last step (8) is coupled to the rotary shaft (3) of the working members (1) and the gear ring (13) in the last step (8) is coupled to the holding means (2).