DK149179B - CIRCUIT WITH LOCKABLE DRIVE CLUTCH - Google Patents
CIRCUIT WITH LOCKABLE DRIVE CLUTCH Download PDFInfo
- Publication number
- DK149179B DK149179B DK294283A DK294283A DK149179B DK 149179 B DK149179 B DK 149179B DK 294283 A DK294283 A DK 294283A DK 294283 A DK294283 A DK 294283A DK 149179 B DK149179 B DK 149179B
- Authority
- DK
- Denmark
- Prior art keywords
- saw blade
- brake
- saw
- circuit
- drive clutch
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D67/00—Combinations of couplings and brakes; Combinations of clutches and brakes
- F16D67/02—Clutch-brake combinations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/29—Details; Component parts; Accessories
- B27B5/38—Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
Description
U9179U9179
Den foreliggende opfindelse angår en rundsav til træ, navnlig til brænde eller brædder, og af den art, der har et stativ og et savbord, og hvis motor eller kraftindtag er drivforbundet med savbladet gennem en udløselig kobling, der har et let tilgængeligt betjeningselement. Rundsave af denne art er typisk beregnet til at drivforbindes med det roterende akseludtag, på en traktor, og savbladet holdes normalt i konstant drift over længere arbejdsperioder. For dog at muliggøre en hurtig standsning af savningen i påkommende tilfælde er netop den nævnte kobling påkrævet, og oftest består betydningselementet af en således anbragt sparkebøjle, at operatøren i sin arbejdspo-sition ved saven let og hurtigt kan udløse koblingen med foden. Normalt består koblingen af et simpelt kileremtræk, hvis kilerem blot slækkes ved brugen af betjeningselementet, der altså fungerer som et nødstop.The present invention relates to a circular saw for wood, in particular for firewood or boards, and of the kind having a stand and a saw table, and whose motor or power intake is driven by the saw blade through a releasable coupling having an easily accessible control element. Circular saws of this kind are typically intended to be driven with the rotary shaft socket, on a tractor, and the saw blade is usually kept in constant operation over extended working periods. However, in order to enable a rapid stop of the saw in the case where necessary, the said coupling is required, and most often the important element consists of a kicking bracket so arranged that the operator in his working position at the saw can easily and quickly release the coupling with the foot. Normally, the clutch consists of a simple V-belt pull, whose V-belt is only extinguished by the use of the control element, which thus acts as an emergency stop.
Ved save af den betragtede art er der normalt tale om ganske store savblade, som har en betragtelig inerti. Hvis koblingen udløses, medens der saves, vil savbladet nok standse næsten omgående ved friktionen med arbejdstryk-ket, men hvis udløsningen sker med savbladet i tomgang, vil bladet ved sin inerti fortsætte sin rotation og derved frembyde en fare for operatøren eller andre.For saws of the kind considered, these are usually very large saw blades which have a considerable inertia. If the clutch is released while sawing, the saw blade will probably stop almost immediately upon friction with the working pressure, but if the release occurs with the saw blade idling, the blade will continue its rotation during its inertia, thus presenting a danger to the operator or others.
Opfindelsen har til formål at angive en rundsav, hvor denne fare er imødegået.The invention aims to provide a circular saw where this danger is met.
Dette er ifølge opfindelsen opnået ved, at der ud for den ene side af savbladet er anbragt en bremsesko som er således betjeningsmæssigt sammenkoblet med den udløselige drivkobling, at bremseskoen trykkes an mod savbladet i afhængighed af en udløsning af drivkoblingen.This is achieved according to the invention in that, on one side of the saw blade, a brake shoe is arranged which is operably coupled to the releasable drive clutch, that the brake shoe is pressed against the saw blade in response to a release of the drive clutch.
En udløsning af koblingen vil således automatisk medføre en hurtig standsning af savbladet, også når dette arbejder i tomgang. Ved opfindelsen kan således opnås en yderst effektiv nødbremse på yderst enkel måde, nemlig blot ved 149179 2 indskydning af en simpel bremseklods mod en i forvejen eksisterende bremseskive, nemlig savbladet selv, i dettes nedre, inoperative område.Thus, releasing the clutch will automatically result in a quick stop of the saw blade, even when it is idling. Thus, the invention provides a highly effective emergency brake in a very simple manner, namely simply by pushing a simple brake pad against a pre-existing brake disk, namely the saw blade itself, in its lower, inoperative area.
Ved en foretrukket udførelse benyttes en aksialtforskyde-lig bremsestang, som rager ind mod siden af savbladet nede under savbordet og af en fjeder holdes således tilbageskudt, at en bremsesko på enden af stangen ligger i kort afstand fra savbladsiden, medens den anden ende af stangen samvirker på kamstyret måde med koblingens betjeningselement, således at bremsestangen påvirkes til fremskydning mod savbladet, når betjeningselementet påvirkes til udløsning af koblingen. Herved fremstår en enkel og robust og sikkert virkende konstruktion.In a preferred embodiment, an axially displaceable brake rod is used which protrudes against the side of the saw blade below the saw table and is held back by a spring such that a brake shoe at one end of the rod is at a short distance from the saw blade side while the other end of the rod cooperates. in a cam controlled manner with the clutch actuator so that the brake rod is actuated to advance toward the saw blade when the actuator is actuated to release the clutch. This results in a simple and robust and safe-acting construction.
Opfindelsen forklares i det følgende nærmere under henvisning til tegningen, der i perspektiv, delvis i snit, viser en rundsav ifølge opfindelsen.The invention is explained in more detail below with reference to the drawing, which shows in perspective, partly in section, a circular saw according to the invention.
Rundsaven omfatter på sædvanlig måde et stativ med en overramme 2 og ben 4. Det med 6 betegnede rundsavblad er anbragt på en aksel 8, som drives af en kileremskive 10. Denne drives gennem en rem 12 fra en remskive 14, som på ikke nærmere vist måde selv er drevet af en motor eller drivforbundet med et aggregat for tilkobling til et roterende akseludtag på en traktor. Remmen 12 er af overlængde, men holdes stram af en trykrulle 16, således at savbladet kan drives kontinuerligt.The circular saw usually comprises a frame with an upper frame 2 and legs 4. The circular saw blade indicated with 6 is mounted on a shaft 8 driven by a V-belt pulley 10. This is driven through a belt 12 from a pulley 14, as not shown in detail. way itself is driven by a motor or drive union with an assembly for connection to a rotary shaft outlet on a tractor. The belt 12 is of overlength, but is held tight by a pressure roller 16 so that the saw blade can be driven continuously.
På overrammen er anbragt nogle opragende ruller 18 til understøtning af et forskydeligt savbord på velkendt og ikke nærmere vist måde. Savbordet har en opstående halvskærm, som normalt dækker den bageste halvdel af savbladet.On the upper frame are placed some upright rollers 18 to support a slidable saw table in a well known and not shown manner. The saw table has an upright half screen, which usually covers the back half of the saw blade.
Trykrullen 16 er lejret ved den ydre ende af en svingarm 20, der er fast anbragt på en drejelig tværaksel 22, der også er fast forbundet med en nedragende aktiveringsarm 3 149179 24. Denne har ved sin nedre ende en krogdel 26, der samvirker med en pal 28 på en derfra fremadragende udløser-arm 30, som fortil er fast lejret på en drejelig tværstang 32, der har en udadragende trædebøjle 34. Når denne bøjle trædes ned, vil udløserarmen 30 svinge opad og derved bringe palen 28 fri af krogen 26, hvorved trykrullen 16 på grund af sin egen og svingarmen 20's tyngde, eventuelt bistået af en fjederkraft, svinger nedad under fremsvingning af aktiveringsarmen 24. Ved denne nedsvingning af trykrullen slækkes remmen 12 tilstrækkeligt til, at drivforbindelsen i remtrækket straks brydes.The pressure roller 16 is mounted at the outer end of a pivot arm 20 which is fixedly mounted on a pivotal transverse shaft 22 which is also firmly connected to a downwardly extending actuating arm 3. This at its lower end has a hook portion 26 cooperating with a pawl 28 on a protruding trigger arm 30 thereto, which is fixedly fixed on a pivotal transverse rod 32 having an outwardly extending strut 34. When this strut is pulled down, the trigger arm 30 will pivot upward thereby freeing pawl 28 from the hook 26, whereby the pressure roller 16, due to its own weight and the swing arm 20, possibly assisted by a spring force, swings downwardly as the actuating arm 24. oscillates. In this swing of the pressure roller, the belt 12 is sufficiently relaxed that the drive connection in the belt pull is immediately broken.
Så vidt beskrevet er konstruktionen almindelig kendt.As far as described, the construction is well known in the art.
Overrammen 2 omfatter en mellemvange 36, på hvilken hovedlejet for savbladet 6 er anbragt. I henhold til opfindelsen er der ved denne vange anbragt en bremsesko 38 nær den pågældende side af savbladet 6. Bremseskoen 38 er anbragt på en mod venstre udragende bremsestang 40, der strækker sig gennem en fast styrebøsning 42 og ender i en aksial stilleskrue 44. Ud for denne er der på dreje-akslen 22, f.eks. på en del af svingarmen 20 eller armen 24, anbragt en fast kamplade 46, som er således lejret og har et således skråt forløb, at den ved den omtalte udløsningssvingning af armsystemet 20,24 vil vandre fra en inaktiv stilling, hvori den enten er ude af indgreb med enden af bremsestangen 40, idet denne holdes af et separat, fast anslag, eller danner stopanslag for bremsestangen i den viste stilling deraf, til en aktiv stilling, hvori den trykker bremsestangen 40 frem mod savbladet 6, således at dette standses ved friktionsindgrebet med bremseskoen 38.The upper frame 2 comprises a middle member 36 on which the main bearing for the saw blade 6 is arranged. According to the invention, in this vane, a brake shoe 38 is arranged near the respective side of the saw blade 6. The brake shoe 38 is mounted on a left-hand brake rod 40 extending through a fixed guide bush 42 and ending in an axial adjusting screw 44. for this there is on the pivot shaft 22, e.g. mounted on a portion of the pivot arm 20 or arm 24, a fixed cam plate 46 which is so enclosed and so inclined that it will migrate from the idle position of the arm system 20,24 from an inactive position in which it is either out of engagement with the end of the brake rod 40, being held by a separate fixed stop, or forming a stop stop for the brake rod in the position shown therein, to an active position in which it pushes the brake rod 40 forward against the saw blade 6 so that it is stopped by the friction engagement. with the brake shoe 38.
Når driften senere ønskes genoptaget kan operatøren med foden trykke aktiveringsarmen 24 fremad, hvorved palindgrebet 26,28 retableres samtidigt med at kampladen 46 149179 4 tillader bremsestangen at vandre tilbage fra savbladet ved hjælp af den nævnte fjeder, ligesom trykrullen 16 svinges op til genaktivering af remtrækket.When the operation is later desired to resume, the operator can push the actuating lever 24 forward with the foot, thereby restoring the pawl engagement 26,28 while allowing the cam plate 46 149179 4 to travel back from the saw blade by the said spring, as well as pushing roller 16 up to reactivate the belt pull. .
Det ses af figuren, at bremseskoen 38 samvirker med savbladet 6 i god afstand fra bladets centrum, dvs. bremse-momentet kan blive ganske stort uden brug af nogen speciel bremseskive. Det har vist sig, at et almindeligt savblad udmærket kan optage et bremsetryk af den fornødne størrelse uden at kræve en modtryksbremse på den anden side af bladet.It can be seen from the figure that the brake shoe 38 cooperates with the saw blade 6 at a good distance from the center of the blade, ie. the braking torque can be quite large without the use of any special brake disc. It has been found that an ordinary saw blade can very well accommodate a brake pressure of the required size without requiring a backpressure brake on the other side of the blade.
Akslen 22 for svingarmen 16 og kampladen 46 er lejret aksialt uforskydeligt. Når dette er tilfældet, kan konstruktionen i øvrigt fremstilles med ganske grove tolerancer, idet man meget let kan justere bremsestangen 40 til en nøjagtigt korrekt beliggenhed ved at skrue på stilleskruen 44 eller et modsvarende anslagsorgan, der naturligvis skal sikres i sin indjusterede tilstand.The shaft 22 of the pivot arm 16 and the cam plate 46 are mounted axially displaceable. In this case, the construction can otherwise be made with quite coarse tolerances, since it is very easy to adjust the brake rod 40 to the exact position by screwing on the set screw 44 or a corresponding stop means, which of course must be secured in its adjusted state.
Bremseskoen kan aktiveres ved koblingsudløsningen på andre måder end den viste. Specielt skal det her nævnes, at bremsestangen kan være indrettet til at trykkes an mod savbladet med en veldefineret fjederkraft, medens kamstyringen så er indrettet til ved udløsning af koblingen at udløse eller frigøre bremsestangen fra dens normalt tilbagetrukne, af styrekammen fastholdte stilling.The brake shoe can be activated by the clutch release in ways other than the one shown. In particular, it should be mentioned here that the brake rod may be adapted to press against the saw blade with a well-defined spring force, while the cam control is then adapted to release or release the brake rod from its normally retracted position held by the control cam.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK294283A DK149179C (en) | 1983-06-27 | 1983-06-27 | CIRCUIT WITH LOCKABLE DRIVE CLUTCH |
GB08415911A GB2142571B (en) | 1983-06-27 | 1984-06-21 | Circular saws |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK294283 | 1983-06-27 | ||
DK294283A DK149179C (en) | 1983-06-27 | 1983-06-27 | CIRCUIT WITH LOCKABLE DRIVE CLUTCH |
Publications (4)
Publication Number | Publication Date |
---|---|
DK294283D0 DK294283D0 (en) | 1983-06-27 |
DK294283A DK294283A (en) | 1984-12-28 |
DK149179B true DK149179B (en) | 1986-03-10 |
DK149179C DK149179C (en) | 1986-08-25 |
Family
ID=8117391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK294283A DK149179C (en) | 1983-06-27 | 1983-06-27 | CIRCUIT WITH LOCKABLE DRIVE CLUTCH |
Country Status (2)
Country | Link |
---|---|
DK (1) | DK149179C (en) |
GB (1) | GB2142571B (en) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2739586A1 (en) * | 1995-10-06 | 1997-04-11 | Gaubert Ets | Safety cut-out system for interrupting and braking action of circular saw |
US9927796B2 (en) | 2001-05-17 | 2018-03-27 | Sawstop Holding Llc | Band saw with improved safety system |
US7836804B2 (en) | 2003-08-20 | 2010-11-23 | Sd3, Llc | Woodworking machines with overmolded arbors |
US20020017179A1 (en) | 2000-08-14 | 2002-02-14 | Gass Stephen F. | Miter saw with improved safety system |
US7055417B1 (en) * | 1999-10-01 | 2006-06-06 | Sd3, Llc | Safety system for power equipment |
US20030056853A1 (en) | 2001-09-21 | 2003-03-27 | Gass Stephen F. | Router with improved safety system |
US8061245B2 (en) | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
US7600455B2 (en) | 2000-08-14 | 2009-10-13 | Sd3, Llc | Logic control for fast-acting safety system |
US6945148B2 (en) * | 2000-09-29 | 2005-09-20 | Sd3, Llc | Miter saw with improved safety system |
US7225712B2 (en) | 2000-08-14 | 2007-06-05 | Sd3, Llc | Motion detecting system for use in a safety system for power equipment |
US6877410B2 (en) * | 2000-09-29 | 2005-04-12 | Sd3, Llc | Miter saw with improved safety system |
US7377199B2 (en) | 2000-09-29 | 2008-05-27 | Sd3, Llc | Contact detection system for power equipment |
US9724840B2 (en) * | 1999-10-01 | 2017-08-08 | Sd3, Llc | Safety systems for power equipment |
US7827890B2 (en) | 2004-01-29 | 2010-11-09 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US7290472B2 (en) | 2002-01-14 | 2007-11-06 | Sd3, Llc | Miter saw with improved safety system |
US7536238B2 (en) | 2003-12-31 | 2009-05-19 | Sd3, Llc | Detection systems for power equipment |
US7024975B2 (en) * | 2000-08-14 | 2006-04-11 | Sd3, Llc | Brake mechanism for power equipment |
US6857345B2 (en) | 2000-08-14 | 2005-02-22 | Sd3, Llc | Brake positioning system |
US7210383B2 (en) | 2000-08-14 | 2007-05-01 | Sd3, Llc | Detection system for power equipment |
US7707920B2 (en) | 2003-12-31 | 2010-05-04 | Sd3, Llc | Table saws with safety systems |
US7712403B2 (en) | 2001-07-03 | 2010-05-11 | Sd3, Llc | Actuators for use in fast-acting safety systems |
US8065943B2 (en) | 2000-09-18 | 2011-11-29 | Sd3, Llc | Translation stop for use in power equipment |
US8459157B2 (en) | 2003-12-31 | 2013-06-11 | Sd3, Llc | Brake cartridges and mounting systems for brake cartridges |
US7789002B2 (en) | 2000-09-29 | 2010-09-07 | Sd3, Llc | Table saw with improved safety system |
US6826988B2 (en) | 2000-09-29 | 2004-12-07 | Sd3, Llc | Miter saw with improved safety system |
US6813983B2 (en) * | 2000-09-29 | 2004-11-09 | Sd3, Llc | Power saw with improved safety system |
EP4338908A2 (en) | 2016-05-31 | 2024-03-20 | SawStop Holding LLC | Detection systems for power tools with active injury mitigation technology |
IT201600079449A1 (en) * | 2016-07-28 | 2018-01-28 | Collino Costr S R L Con Unico Socio | CIRCULAR SAW BENCH FOR POWER TAKE-OFF WITH SAFETY DEVICE |
IT201800009977A1 (en) * | 2018-10-31 | 2020-05-01 | Ricca Andrea & C Snc | LOG CUTTING MACHINE |
CN111958042B (en) * | 2020-08-06 | 2021-07-27 | 芜湖懒人智能科技有限公司 | Binding type automatic cutting equipment for square tubes |
-
1983
- 1983-06-27 DK DK294283A patent/DK149179C/en active
-
1984
- 1984-06-21 GB GB08415911A patent/GB2142571B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2142571A (en) | 1985-01-23 |
DK149179C (en) | 1986-08-25 |
GB2142571B (en) | 1986-08-28 |
GB8415911D0 (en) | 1984-07-25 |
DK294283A (en) | 1984-12-28 |
DK294283D0 (en) | 1983-06-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK149179B (en) | CIRCUIT WITH LOCKABLE DRIVE CLUTCH | |
US4309862A (en) | Lawn mower and controls therefor | |
US3367459A (en) | Belt tightner and brake for mower | |
US4370810A (en) | Portable motor chain saw | |
US3793727A (en) | Chain saw safety method and apparatus | |
US3991469A (en) | Safety braking mechanism for a portable chain saw | |
CA1052237A (en) | Power saw | |
US4793064A (en) | Chain saw safety braking device | |
US3739475A (en) | Chain saw safety method and apparatus | |
US2530867A (en) | Spreaders for circular saw wood cutting machines | |
US3839795A (en) | Chain saw safety method and apparatus | |
US3937306A (en) | Automatic brake actuator for a chain saw | |
US3731472A (en) | Rotary mower spindle brake | |
US4215612A (en) | Support apparatus for chain saw | |
US2205176A (en) | Power transmitter | |
US4334357A (en) | Safety braking apparatus for a portable chain saw | |
JPH0157641B2 (en) | ||
US4651423A (en) | Chain saw cutting chain safety stop | |
JP2008271830A (en) | Electric bush cutter | |
US4077125A (en) | Automatic safety brake for chain saw | |
US1269883A (en) | Hacksaw-machine. | |
US2985270A (en) | Sewing machine drive | |
US20110247472A1 (en) | Bandwheel and blade brake system | |
US5237752A (en) | Movable control-handle for chainsaw | |
DE139842C (en) |