NO760616L

NO760616L -

Info

Publication number: NO760616L
Application number: NO760616A
Authority: NO
Inventors: Knud Helge Nielsen; Poul Erik Korsman Carlsen
Original assignee: Knud Helge Nielsen; Poul Erik Korsman Carlsen
Priority date: 1975-02-25
Filing date: 1976-02-24
Publication date: 1976-08-26
Also published as: DE2607081A1; GB1538564A; DK136763B; IT1056187B; DK73575A; DK136763C

Description

"Skjæreapparat for plastrør" "Cutting device for plastic pipes"

Oppfinnelsen angår et skjæreapparat for plastrør og av den art hvor røret fastholdes av to spennbakker, mens det eller de skjærende organer er montert på en holder, som er innrettet til å kretse omkring røret, styrt av en sirkulær skive. The invention relates to a cutting device for plastic pipes and of the kind where the pipe is held by two clamping jaws, while the cutting member(s) are mounted on a holder, which is arranged to revolve around the pipe, guided by a circular disc.

De kjente skjæreapparater av denne art er beregnet til å skjære metallrør eller - stenger og kan ikke anvendes for kloak- eller trykkrør av plast, dels fordi de anvendte spennbakker lett kan deformere røret på grunn av den normalt lille vegg-. tykkelse, dels som følge av at skjæreorganenes omkretsbevegelse ikke er tilstrekkelig nøyaktig sentrert i forhold til det fast-holdte rør, slik at skjæreorganene lett. vil hugge fast i plast-materialet med risiko for å ødelegge røret totalt. The known cutting devices of this kind are intended to cut metal pipes or rods and cannot be used for sewage or pressure pipes made of plastic, partly because the clamping jaws used can easily deform the pipe due to the normally small wall. thickness, partly as a result of the circumferential movement of the cutting members not being sufficiently accurately centered in relation to the fixed pipe, so that the cutting members easily. will bite into the plastic material with the risk of destroying the pipe completely.

I dansk patent nr. 11820 er beskrevet et skjæreapparat hvor skjæreorganenes fastspenning automatisk justeres ved hjelp av en sporskive og et bremseorgan, men heller ikke dette apparat vil kunne anvendes for plastrør, fordi bremseorganet vil deformere røret umiddelbart opp til snittflaten, og bremseklossens rota-sjon med skjæreorganet vil være problematisk. In Danish patent no. 11820, a cutting device is described where the tension of the cutting devices is automatically adjusted by means of a slot disc and a brake device, but this device will not be usable for plastic pipes either, because the brake device will deform the pipe immediately up to the cut surface, and the rotation of the brake pad with the cutting member will be problematic.

Manglene ved de eksisterende rørskjærere har medført at det'er alminnelig praksis å sage rørene over med f. eks. en baufil. Dette innebærer imidlertid at endekantene av rørdelene blir skjeve og forsynt med gråter, slik at de for det første ikke passer nøyaktig inn i en muffe og for det annet må files til for å fjerne gråtene og for å avfase kanten, for at den kan gli tett inn i en muffe med 0-ring, uten at 0-ringen rives med av rørkanten. The shortcomings of the existing pipe cutters have meant that it is common practice to saw the pipes with e.g. a hacksaw. However, this means that the end edges of the pipe parts become crooked and provided with burrs, so that, firstly, they do not fit exactly into a sleeve and, secondly, they have to be filed to remove the burrs and to chamfer the edge, so that it can slide tightly into a sleeve with an 0-ring, without the 0-ring being pulled along by the pipe edge.

Formålet med foreliggende oppfinnelse er å tilveiebrin-ge et skjæreapparat, hvor ulempene ved de hittil kjente apparater er eliminert. The purpose of the present invention is to provide a cutting apparatus, where the disadvantages of the previously known apparatus are eliminated.

Dette oppnåes ved skjæreapparatet ifølge oppfinnelsen, som erkarakterisert veddet som er angitt i karakteristikken til krav 1. This is achieved by the cutting device according to the invention, which is characterized by the characteristics stated in claim 1.

Herved fåes en nøyaktig lagring av skjæreorganet i forhold til det rør som skal skjæres over, idet skjæreorganets omdreinings-akse faller sammen med røraksen. This results in an accurate positioning of the cutting element in relation to the pipe to be cut, as the axis of rotation of the cutting element coincides with the axis of the pipe.

En hensiktsmessig utførelsesform er angitt i krav 2, hvorved det oppnåes en lett betjening av skjæreapparatet,. idet håndtaket for skjæreorganet lett kan dreies rundt om røret, mens håndtaket for spennbakkene holdes fast. An appropriate embodiment is stated in claim 2, whereby easy operation of the cutting apparatus is achieved. as the handle for the cutting device can easily be turned around the pipe, while the handle for the clamping jaws is held firmly.

For å få en nøyaktig sentrering av spennbakkene og dermed røret, som skal skjæres over, er den ene spennbakken lagret som angitt i krav 3. In order to achieve an accurate centering of the clamping jaws and thus the pipe, which is to be cut across, one clamping jaw is stored as specified in claim 3.

Spennbakkenes fastklemning omkring et rør kan foregå som angitt i krav 4, men ved utformningen ifølge krav 5 fåes en parallell-forskyvning av den innstillbare spennbakke og dermed en mere sikker fastklemning av et rør uten at dette deformeres, på grunn av toleran-se—avvikelser i rørets diameter. Clamping of the clamping jaws around a pipe can take place as stated in claim 4, but with the design according to claim 5, a parallel displacement of the adjustable clamping jaw is obtained and thus a more secure clamping of a pipe without it being deformed, due to tolerance deviations in the diameter of the pipe.

Den for rørets innføring i en muffe nødvendige avfasingThe chamfering required for the introduction of the pipe into a sleeve

av kanten kan samtidig med overskjæringen utføres med skjæreorganet, som angitt i krav 6. of the edge can be carried out simultaneously with the overcutting with the cutting device, as specified in claim 6.

Oppfinnelsen skal forklares nærmere i det følgende ved en utførelsesform for skjæreapparatet under henvisning til tegningen, hvor fig. 1 viser et skjæreapparat ifølge oppfinnelsen, sett i aksial retning, og ,y The invention will be explained in more detail in the following by an embodiment of the cutting apparatus with reference to the drawing, where fig. 1 shows a cutting device according to the invention, seen in the axial direction, and ,y

fig. 2 er et snitt etter linjen II-II på fig. 1.fig. 2 is a section along the line II-II in fig. 1.

Skjæreapparatet på tegningen har et skjæreorgan 1, somThe cutting apparatus in the drawing has a cutting means 1, which

er forskyvbart innsatt i en holder 2 med innvendig gjenge, hvoriis displaceably inserted in a holder 2 with internal thread, in which

et tilspenningsorgan 3 er innskrudd. Skjæreorganet 1 holdes i stilling av en stift 4, og tilspenningsorganet 3 er ved hjelp av en stift 5 forbundet med et på skjæreorganet 1 virkende mellomstykke. Holderen til skjæreorganet 1 er ved hjelp av skruer 15 fastspent på en sirkulær lagring 7, med en innvendig neddreiet del, som: med glidepasning opptar en lagerskive 6, som fastholdes i den neddreide del av lagringen 7 ved hjelp av en med skruer 14 til lagringen 7 forbundet hulskive 8. a tensioning member 3 is screwed in. The cutting member 1 is held in position by a pin 4, and the tensioning member 3 is connected by means of a pin 5 to an intermediate piece acting on the cutting member 1. The holder for the cutting device 1 is clamped by means of screws 15 to a circular bearing 7, with an internally turned down part, which: with a sliding fit occupies a bearing disc 6, which is held in the turned down part of the bearing 7 by means of a with screws 14 to the bearing 7 connected hollow disc 8.

Lagerskiven 6 er med skruer 13 fast forbundet med en halvsylindrisk spennbakke 9, hvis innvendige diameter i det vesentlige svarer til den ytre diameter av det rør som skal skjæres over. En annen spennbakke 10 er forbundet med lagerskiven 6 ved hjelp av en dreietapp 16 og med den første spennbakke 9 gjennom et spennorgan 11, som går gjennom et glatt hull i spennbakken 10, og er skrudd inn i et gjenget hull i spennbakken 9. Spennorganet 11 er fiksert The bearing disc 6 is firmly connected with screws 13 to a semi-cylindrical clamping jaw 9, whose inner diameter essentially corresponds to the outer diameter of the pipe to be cut. Another clamping jaw 10 is connected to the bearing disc 6 by means of a pivot pin 16 and to the first clamping jaw 9 through a clamping member 11, which passes through a smooth hole in the clamping jaw 10, and is screwed into a threaded hole in the clamping jaw 9. The clamping member 11 is fixed

i glatthullet ved hjelp av en låsring 12.in the smooth hole using a locking ring 12.

Av hensyn til sentreringen av skjæreorganets bevegelse er den faste spennbakken 9 litt høyere enn den andre spennbakken 10, idet den raker inn i en tilsvarende utsparing i lagerskiven 6. Due to the centering of the cutting member's movement, the fixed clamping jaw 9 is slightly higher than the other clamping jaw 10, as it protrudes into a corresponding recess in the bearing disc 6.

Anvendelsen av det ovenfor beskrevne skjæreapparat er meget enkel, idet apparatet anbringes omkring røret som skal skjæres over, hvoretter den innstillbare spennbakken 10 ved hjelp av håndtaket 11 spennes slik at spennbakkene 9 og 10 fastklemmer røret. The use of the above-described cutting device is very simple, as the device is placed around the pipe to be cut, after which the adjustable clamping jaw 10 is tightened by means of the handle 11 so that the clamping jaws 9 and 10 clamp the pipe.

Ved å fastholde håndtaket 11 og dreie skjæreorganets håndtak 3 rundt om røret under samtidig tilspenning av skjæreorganet 1,oppnåes en overskjæring av røret som er nøyaktig vinkel-rett på dettes akse, slik at det slutter seg tett til den indre kant på en tilsluttet muffe langs hele omkretsen. By holding the handle 11 and rotating the cutting device's handle 3 around the pipe while simultaneously tensioning the cutting device 1, a cut of the pipe is achieved that is exactly perpendicular to its axis, so that it joins tightly to the inner edge of a connected sleeve along the entire circumference.

Skjæreorganet 1 kan som vist på tegningen ha en slik form at det samtidig med overskjæringen oppstår avfasete kanter på de to rørdeler. As shown in the drawing, the cutting member 1 can have such a shape that chamfered edges occur on the two pipe parts at the same time as the cutting.

Kanten på et rør blir på denne måten så ensartet avfaset at det praktisk talt er umulig å rive 0-ringen ut av sin stilling i en muffe under innføringen av rørenden', hvilket har vært det største problem ved den hittil kjente teknikk. The edge of a pipe is in this way so uniformly chamfered that it is practically impossible to tear the 0-ring out of its position in a sleeve during the introduction of the pipe end', which has been the biggest problem with the hitherto known technique.

Claims

1. Cutting device for plastic pipes of the type where the pipe is held between two clamping jaws, while the cutting member(s) is mounted on a holder which is arranged to revolve around the pipe, controlled by a circular disc, characterized in that the clamping jaws are semi-cylindrical bowls (9 ,10) whose internal diameter is substantially equal to the external diameter of the pipe to be cut, one of which bowls is fixedly connected to a circular bearing disc (6) on which is mounted an axially fixed bearing ring (7, 8) which carries a radially adjustable cutting member (1).

2. Cutting device as specified in claim 1, characterized in that the tensioning member (11) for the clamping jaws (9,10) is a rod with a handle protruding from one of the jaws, while the clamping member (3) for the cutting member (1) is a correspondingly protruding rod with handle.

3. Cutting device as stated in claim 1 or 2, characterized in that the clamping tray (9) fixed to the bearing disc (6) is stored in a recess corresponding to the clamping tray in said bearing disc.

4. Cutting device as specified in one of claims 1-3, characterized in that the adjustable clamping jaw on one side is rotatably connected to the bearing disc by means of an axle-t app, while the clamping member is placed in a smooth hole on the other side and screwed into a screw-threaded hole in the solid ground.

5. Cutting apparatus as specified in one of the preceding claims 1 to 3, characterized in that a tubular ring is attached to the fixed clamping jaw which encloses the adjustable clamping jaw and carries the clamping member for this.

6. Cutting device as stated in one of the preceding claims, characterized in that the cutting member is designed in such a way that, simultaneously with the cutting of a pipe, it chamfers the two cutting edges.

7. Cutting device as specified in claim 4, characterized in that there are recesses or such a rounding on the inside along the axial edges of the adjustable clamping jaws that these edges, during the clamping of the clamping jaws around a pipe, do not have the opportunity to go against the wall.