DK9400350U3

DK9400350U3 - Drilling setup for hammer machines

Info

Publication number: DK9400350U3
Application number: DK9400350U
Authority: DK
Inventors: Mogens B Nielsen
Original assignee: American Tool Comp Inc
Priority date: 1994-09-13
Filing date: 1994-09-13
Publication date: 1995-12-13
Also published as: EP0777556A1; WO1996008343A1

Description

DK 94 00350 U3DK 94 00350 U3

Boreopsætning for hammerboremaskiner.Drilling setup for hammer drills.

Denne frembringelse vedrører et opsætningssystem for hammer og rotationsbor i håndboremaskiner af den .type der er forsynet med et elpneumatisk slagværk.This production relates to a hammer and rotary drill set-up system in hand drills of the type provided with an electric pneumatic percussion.

Systemet består af en borholder som er indbygget i boremaskinen og et samvirkende skaft. Boremaskiner af denne type anvendes i bygge og anlægsindustrien til fremstilling af huller i hårde stenmaterialer.The system consists of a drill holder built into the drill and a cooperating shaft. Drills of this type are used in the construction and civil engineering industries to make holes in hard stone materials.

Borholder og borskaft er Udformet således at borskaftet under boreprocessen kan bevæge sig axialt i forhold til hinanden, hvilket er nødvendig grundet, den kraftige slagenergi der af det pneumatiske slagværk påføres boret, og som ved en fast forbindelse ville overføres til borholderen med deraf følgende energitab. Drejemomentet overføres fra borholder til borskaft ved hjælp af radiale medbringerlister anbragt indvendigt i borholderen og som samvirker med notspor i borskaft.Drill holder and drill shaft are Designed so that the drill shaft during the drilling process can move axially relative to each other, which is necessary due to the strong impact energy applied to the drill by the pneumatic percussion and which would be transmitted to the drill holder with a consequent loss of energy. The torque is transferred from the drill holder to the drill shaft by means of radial guide strips placed inside the drill holder and which cooperate with groove grooves in the drill shaft.

Opsætningssystemer af denne art er kendt. I et tysk patent DE - PS 2551125 er der beskrevet et system der består af en borholder og et sammenvirkende skaft. Borholderen består af en bøsning som indvendigt har 1 eller 2 medbringerlister for radial medbringning, til fastholdelse af borskaftet i axial retning er der i bøsningens væg 1 eller 2 tværsgående huller for placering af radialt forskydelige låseruller eller kugler. Borskaftet er forsynet med, i retning mod borskaftets slagende, 1 eller 2 lukkede notspor for axial fastholdelse, samt 1 eller 2 imod slagenden åbne notspor for radial medbringning.Set-up systems of this kind are known. A German patent DE-PS 2551125 discloses a system consisting of a drill holder and a cooperating shaft. The drill holder consists of a sleeve having 1 or 2 guide rails for radial engagement, for holding the drill shaft in axial direction, in the wall of the sleeve there are 1 or 2 transverse holes for placement of radially displaceable locking rolls or balls. The drill shaft is provided with 1 or 2 closed grooves for axial retention in the direction of the striking shaft of the drill shaft, and 1 or 2 slots open for the radial bearing towards the impact end.

Den axiale forskydning mellem borholder og bor som opstår for hvert eneste slag under hele boreprocessen vil i samvirkning med drejemomentet forårsage et betydeligt slid på medbringer-fladerne hvilket efter en tid medfører at boret vil kante sig i forhold borets akse. Dette forårsager en delvis overførelse af slagenergi til borholder som betyder tab af energi til boreproces, samt beskadigelse af borholder.The axial displacement between the drill holder and drill which occurs for each stroke during the entire drilling process will, in conjunction with the torque, cause considerable wear on the guide surfaces, which will eventually cause the drill to tilt in relation to the drill axis. This causes a partial transfer of impact energy to the drill holder, which means loss of energy for the drilling process, as well as damage to the drill holder.

Den kendte borholder er beregnet for fastholdelse af hammerbor til boring i stenmaterialer. Dette betyder at håndværkere må medbringe en ekstra boremaskine med et andet opsætningssystem som kan fastholde og eksakt styre de bortyper der anvendes til rotationsboring af huller i andre materialer.The known drill holder is intended for retaining hammer drills for drilling into stone materials. This means that craftsmen must bring an extra drill with another set-up system that can maintain and precisely control the types of drills used for rotary drilling of holes in other materials.

Formålet med opfindelsen er at frembringe et opsætningssystem der mindsker slidet ved hammerboreprocessen, samt at muliggøre en nøjagtig og eksakt opsætning af andre bortyper i hammerboremaskinen således at håndværkeren kun skal bruge en maskine til borearbejder i forskellige materialer.The object of the invention is to provide a set-up system that reduces wear and tear during the hammer drilling process, and to enable an accurate and precise set-up of other types of drills in the hammer drill so that the craftsman will only use a machine for drilling in different materials.

Det nye ved opfindelsen er en stor forøgelse af den samlede medbringerkontaktflade mellem bor og borholder, samt en konisk DK 94 00350 U3 udformet centrering og boretryksoptager anordning beregnet for rotationsboring.The new feature of the invention is a large increase in the total carrier contact surface between drill and drill holder, as well as a tapered centering and drill pressure pickup device intended for rotary drilling.

Det forøgede kontaktfladeareal medfører et mindsket tryk pr. arealenhed som funktion af drejemomentet og nedsætter det adhæsive slid, den valgte udformning mindsker torsionsspændinger hvilket forbedrer udmattelsesstyrken i bofskaftet som udsættes for axiale slagpåvirkninger, der kunne medføre et udmattelsesbrud såfremt det øgedede kontaktfladeareal blev opnået med en udformning der øgede torsionsspændingerne.Den koniske anordning medfører en nøjagtig centrering af rotationsbor, konusvinklen er så stejl at der ingen kilevirkning er, den fungerer som et stop der optager det axiale boretryk, drejmo-mentet overføres overføres som på hammerbor med medbringer-lister og notspor.,The increased contact surface area results in a reduced pressure per area unit as a function of torque and decreases the adhesive wear, the design selected reduces torsional stresses which improves fatigue strength in the shaft which is subject to axial impact which could cause a fatigue fracture if the increased contact surface area was obtained with a design which increased the torsional tension. exact centering of the rotary drill, the cone angle is so steep that there is no wedge action, it acts as a stop that absorbs the axial drilling pressure, the torque is transmitted as if on a hammer drill with carrier strips and grooves.,

Frembringelsen forklares i det følgende under henvisning til figurerne på tegningerne.The invention is explained below with reference to the figures in the drawings.

Fig.l viser det nye hammerborskaft med dejimod slagenden åbne notspor. Fig. 2 viser det imod slagendén lukkede notspor. Fig. 3 viser et tværsnit af den nye udførelsesform. Fig. 4 det nye rotationsboreskaft. Fig. 5 viser ét tværsnit af skaft og borholderens bøsning. Fig. 6 viser et axialt snit af borholder med et rotationsbor isat.Fig. 1 shows the new hammer drill shaft with the open end groove on the opposite end. FIG. 2 shows the groove closed against the impact. FIG. 3 shows a cross section of the new embodiment. FIG. 4 the new rotary drill shaft. FIG. 5 shows one cross section of the shaft and the drill holder bush. FIG. 6 shows an axial section of the drill holder with a rotary drill inserted.

På fig. 1 ses borskaftet til hammerbor (16) med de imod slagenden åbne notspor (11)(10) sporene (10) er nye i forhold til kendt teknik.In FIG. 1, the drill shaft for hammer drill (16) with the groove grooves (11) (10) open against the impact end (10) is seen to be new in the prior art.

På fig. 2 er borskåftet (16) vist med det lukkede notspor (12) og de nye spor (10).In FIG. 2, the drill bit (16) is shown with the closed groove (12) and the new groove (10).

På fig. 3 ses borskaftet (16) i tværsnit med den indbyrdes placering af de åbne notspor (11)(10) samt djeres udformning, spo-ne (10) er nye og medfører et øget kontak|tareal. I sporene (11) er højden på på flankerne (14) og (13) forskellig således at flanken (13) er højere end (14) dette medfører også en forøgelse af kontaktareal i medbringerretning.In FIG. 3, the drill shaft (16) is seen in cross-section with the mutual positioning of the open groove grooves (11) (10) and the shape of the animals, the coils (10) are new and result in increased contact area. In the grooves (11), the height of the flanks (14) and (13) is different so that the flank (13) is higher than (14) this also causes an increase of contact area in the direction of travel.

På fig. 4 ses borskaftet (17) til rotatioinsbor med notsporene (10) (11) og et imod slagenden lukket spo'r (20) som kan samvirke med låsekuglen (21) for axial fastholdelse, den koniske boretryksoptagelsesdel (19) vil i forbindelse med en rotationsboreproces optage det axiale borjetryk, den koniske udformning centrerer boreværktøjet, indstillingsvinklen på konussen ligger over fastkilingsvinklen slåledes at boret ikke kan sætte sig fast under optagelse af borjetryk, dette medfører en hurtig og bekvem omskiftning af bor uden nogen form for hjælpeværktøj, konussen kan og skal ikke overføre drejemoment, dette gøres af sporene (10) og (11).In FIG. 4, the rotary drill bit (17) is seen with the groove grooves (10) (11) and a groove (20) closed to the impact end which cooperates with the locking ball (21) for axial retention, rotary drilling process takes up the axial drilling pressure, the tapered design centers the drilling tool, the angle of adjustment of the cone is above the wedge angle so that the drill cannot get stuck during recording of drilling pressure, this results in a quick and convenient change of drill without any tool, the cone can and should do not transmit torque, this is done by the grooves (10) and (11).

På fig.5 ses et tværsnit af skaft (17) og bøsning (18). Tværsnittet af skaftet (17) er identisk med tværsnittet af skaftet (16), og de samvirker begge med bøsning (118) som er forsynet 2Figure 5 shows a cross-section of shaft (17) and bushing (18). The cross-section of the shaft (17) is identical to the cross-section of the shaft (16) and they both cooperate with the bush (118) provided 2.

Claims

1. Drill shank for mounting in a drill holder on an electric pneumatic hand drill for stroke rotary drilling, with at least two diametrically and notably closed grooves (20) (12) and at least two diametrically and openly grooved grooves perpendicular to the grooves (11) closed against the impact end and at least four grooves (10) open against the impact end so that they are diametrically located over an axis drawn perpendicular to the axis through the two impact grooves (12) closed against the impact end. Characterized in that the cross-section of the grooves (10) is smaller than the cross-section of the grooves (11).

Tool according to claim 1, characterized in that the length from the impact end (15) of the grooves (10) (11) in the axial direction is at least 4mm longer than the length of the closed groove (12) (20) measured from the impact end (15). .

Tool according to claims 1 and 2, characterized in that the flank (13) in the radial direction is longer than the flank (14).

Tool according to claim 1, characterized in that the shaft (17) is provided with a conically shaped drill press take-up part (19) which cooperates with the conical part (24) of the sleeve (18).

Tool according to Claim 1, characterized in that the smallest diameter of the cone (19) lies in the direction towards the striking (15) of the shank (17).