SE175755C1

SE175755C1 -

Info

Publication number: SE175755C1
Authority: SE
Publication date: 1961-01-01

Description

Uppfinnare: S H Hedvall Foreliggande uppfinning hanfor sig till bagsagblad for sagning i tra och dylikt, vilka blad aro forsedda med skar- eller Hy-Lander, vilka aro indelade i grupper atskilda av spanluekor storre an tandluekorna. Sadana blad ha sin kanske framsta anvandning for sagning av tuft virke, exempelvis sagning av torr ved. Dylika blad aro kanda i ett stort antal typer, exempelvis med tanderna uppdelade i olika grupper med olika tanddelning mom samma grupp, varvid tanddelningen kan variera efter olika monster, sasom successivt tilltagande eller avtagande i shgens langdriktning. Hit-tills Hilda sagar av ovan anforda typer ha ofta visat sig behaftade med diverse ofullkomligheter, ,sasom olika skarmotstand for olika sagningsriktning, forekomsten av kritiska vibrationssvangningstal m. m. Inventor: S H Hedvall The present invention relates to back-saw blades for sawing in wood and the like, which blades are provided with cutting or Hy-Lander, which are divided into groups separated by span hatches larger than the toothed hatches. Sadana leaves have their perhaps foremost use for sawing tufted wood, for example sawing dry wood. Such blades are known in a large number of types, for example with the teeth divided into different groups with different tooth division in the same group, whereby the tooth division can vary according to different monsters, such as successively increasing or decreasing in the longitudinal direction of the tooth. Hitherto, Hilda's saws of the above-mentioned types have often proved to be fraught with various imperfections, such as different shear resistance for different sawing directions, the occurrence of critical vibration oscillation numbers, etc.

Uppfinningen, som avser ett overvinnande av hi. a. dessa svarigheter, hanfor sig till den bagsagbladstyp, vid vilken tanderna Oro indelade i grupper, atskilda av spanluckor storre On tandluckorna. Uppfinningen kannetecknas darav, att varje grupp bestar av minst tre tander, saint att tanddelningen inom varje grupp Or konstant samt av annat -aide On motsvarande far atminstone en angransande tandgrupp. D. lika tanddelning ger i b.uvudsak lika skarmotstand vid samma slag och dimension av Under kommer skarmotstandet all bliva lika fOr bagge sagningsriktningarna, vilket ju Or av stor vikt for sagningsarbetet. Vid olika tanddelning inom en grupp kommer skarmotstandskurvorna for olika shgriktning att bli olika, vilket ju Oven p0 ett oformanligt satt skulle paverka sagningsarbetet, nagot som undvikes genom uppfinningen. Enligt uppfinningen later man tanddelningen variera mellan grupperna, varigenom nagot speciellt >egensvangniugstah for hela bladet icke kommer att forefinnas, varf Or man vid sagbladet enligt uppfinningen forutom ovan namnda fordel har vinner fOrdelen av en eli- minering av de vid manga sagbladstyper alltf Or kanda, obehagliga vibrationerna under sagarbetet. Samtidigt med en jamn och vibrationsfri gang sagar dessutom bladet rakt utan avvikelser i sidled och har en hag avverkningsformaga. The invention, which relates to the overcoming of hi. a. these similarities, hanfor sig to the type of saw blade, in which the teeth Oro divided into groups, separated by span hatches larger On the tooth hatches. The invention can be characterized in that each group consists of at least three teeth, saint that the tooth division within each group Or is constant and of another -aide On correspondingly has at least one adjacent tooth group. D. equal tooth pitch gives essentially equal cutting resistance at the same stroke and dimension of Under, the cutting resistance will all be the same for the sawing directions, which of course is of great importance for the sawing work. With different tooth divisions within a group, the screen resistance curves for different shear directions will be different, which of course would also in an unforgivable way affect the sawing work, something which is avoided by the invention. According to the invention, the tooth division is allowed to vary between the groups, whereby no special property for the whole blade will be present, where in the saw blade according to the invention, in addition to the above-mentioned advantage, one has the advantage of eliminating the many saw blade types. unpleasant vibrations during sawing. At the same time as a smooth and vibration-free gait, the blade also saws straight without deviations laterally and has a clear felling shape.

Man later vanligtvis vid sagbladet enligt uppfinningen tanddelningen vara atminstone i huvudsak lika for varannan tandgrupp, vilket Oven ur tillverkningsteknisk synpunkt medfor vissa fordelar. Skrankning av tva grupper kan ske samtidigt och med konstant frammatning Indian varje arbetsslag av skrankmaskinen, och Oven stansningen och filningen bli relativt enkla ph grund av symmetrien hos bladet och det jamfOrelsevis ringa antalet olika tanddelningar. Ett blad med tanddelning enligt uppfinningen ger alltsa. hag sagningseffekt samt jamn och vibrationsfri gang, samtidigt som det Or relativt billigt i framstallning. In the case of the saw blade according to the invention, the tooth pitch is usually left at least substantially equal for every other tooth group, which also has certain advantages from a manufacturing point of view. Countering of two groups can take place simultaneously and with constant feed Indian each working stroke of the counter machine, and Oven punching and filing become relatively simple ph due to the symmetry of the blade and the comparatively small number of different tooth divisions. A blade with tooth pitch according to the invention provides thus. hag sawing effect as well as smooth and vibration-free running, while it Or relatively cheap in manufacture.

Olika utforingsformer for bladet framga narmare nedan i samband flied beskrivningen av de bifogade figurerna. Fig. 1 visar ett bagsagblad av en typ med lika stor spanlueka och fig. 2 visar en annan typ med olika stor spanlueka. Various embodiments of the blade appear in more detail below in connection with the description of the accompanying figures. Fig. 1 shows a bag saw blade of a type with the same size spanlueka and Fig. 2 shows another type with different size spanlueka.

I fig. 1 visas ett bagsagblad 11 med tre rivthnder 12, 13 etc. inom varje grupp. Tanddelningen Or som sagts konstant inom varje grupp (exempelvis 13), men skiljer sig ifran motsvarande varde for atminstone en, i det visade fallet bagge, angransande grupperna 12, 14. Grupperna Oro atskilda av spanluckor 15 av konstant (fig. 1) eller varierande (fig. 2) bredd och bagge dessa forhallanden Oro applicerbara pa olika inom ramen for uppfinningen fOrekommande bagsaghladstyper. (Spanluckorna ha storre bredd och i vissa fall Oven starre djup On tandluckorna.) Skrankningen Or har utfard med varannan tand skrankt i motsatt riktning, men detta kan givetvis utforas annorlunda vid delar av bladet. 2— — Hela delar av bladet kunna Liven vara skrankta i enlighet med fig. 2 vid vilken narliggande tander i angransande tandgrupper skrankts omvaxlande i samma och i motsatt riktning. liven annan typ av skrankning är givetvis tankbar. Antalet tander mom vane grupp ãr i de valda fallen ire, men aven annat antal kan givetvis i vissa fall vara lampligt, och I. ö. kan det i vissa fall vara fOrdelaktigt med olika antal for olika grupper. I dylika fall kan det ofta vara lampligt med annat skrankningsmOnster an ovan anforda (se 16, 17 i figurerna). Fig. 1 shows a backsaw blade 11 with three tearing hands 12, 13 etc. within each group. The tooth division Or which is said to be constant within each group (for example 13), but differs from the corresponding value for at least one, in the case shown ram, adjacent groups 12, 14. The groups Oro separated by chip hatches 15 of constant (Fig. 1) or varying (Fig. 2) width and ram these ratios are applicable to various types of bag saw blades occurring within the scope of the invention. (The chip hatches have a larger width and in some cases even stiffer depths on the tooth hatches.) The counter Or has a slope with every other tooth tilted in the opposite direction, but this can of course be done differently at parts of the blade. 2— - Entire parts of the blade may be slanted in accordance with Fig. 2 in which adjacent teeth in adjacent tooth groups are slanted alternately in the same and in the opposite direction. life other type of counter is of course conceivable. The number tander mom vane group is in the selected cases ire, but also another number can of course in some cases be appropriate, and I. ö. It can in some cases be advantageous with different numbers for different groups. In such cases, it may often be appropriate to use a different counter-pattern than above (see 16, 17 in the figures).

De olika bladen kunna vara ohardade eller hardade till samma hardhet over hela bladet och darefter ev. extrahardade vid tandspetsarna. Skrankningen forlagges darvid mellan den vid extrahardningen uppkommande mjukzonen och tandbasen eller i denna zon. Ett vanligt aktuellt matt pa skrankvidden är 1,20-1,40 mm, foretradesvis 1,30 mm mellan tandspetsarnas bra sammanbindningslinjer, men man kan i vissa fall ha olika skrankvidd vid olika Under eller vid olika delar av bladet. The different blades can be uncured or hardened to the same hardness over the entire blade and then possibly. extra hardened at the tooth tips. The counter is then located between the soft zone arising during the extra hardening and the tooth base or in this zone. A common current mat on the counter width is 1.20-1.40 mm, preferably 1.30 mm between the good connecting lines of the tooth tips, but you can in some cases have different counter widths at different Under or at different parts of the blade.

Uppfinningen am- i forsta hand avsedd att appliceras pa blad av tjockleken 0,65-0,80 mm, fOretradesvis 0,73 -± 0,03 mm och med bredden liggande mellan 15 och 25 mm, foretradesvis vid 20 mm. Uppfinningen am- dock ej hegransad enbart till ovan namnda utforingsform, utan kan aven tankas applicerad vid andra typer av sagblad, ev. med annan typ av tandning, mom ramen for de uppstallda patentanspraken. The invention is primarily intended to be applied to sheets of thickness 0.65-0.80 mm, preferably 0.73 - ± 0.03 mm and with a width of between 15 and 25 mm, preferably at 20 mm. However, the invention is not limited only to the above-mentioned embodiment, but can also be refueled and applied to other types of saw blades, possibly. with another type of ignition, within the framework of the filed patent claims.

V V

Claims

Patent claim:

Bagsaw blades for sawing in tra and the like, which blade is provided with rake or goiter teeth, which are divided into groups, separated by racks larger than the tooth gaps, can be drawn ddrav, that each group consists of at least three Wonders, and that the tooth division within habit group an constant and of other value an equivalent for at least one adjacent tooth group.

Bagsdgblad according to claim 1, characterized in that the tooth pitch is substantially the same for every other tooth group.

3. Bigsagblad according to patent claims 1-2, may be characterized by the fact that adjacent teeth within different tooth groups are concerned, at least for certain groups, that each of them has its own hall.

4. Bagsagblad efter patentanspraken 1-2, lannetecknat darav, att narlignad lander i different tandgrouper aro atmin for certain grupp er skrankta at samma Anforda Publikationer: Patents krif ter! N Sverige 68031; Norway 452 &7; U. S. A. 1 512 62

5. Other publications: Handbok for huggare. Sthlm 1053. p. 18. Studies in forestry arhetslara. Sthlm 1943. pp. 54-55.