WO1993015866A1 - Cadre de scie a section transversale tubulaire comportant un repli interne longitudinal - Google Patents

Cadre de scie a section transversale tubulaire comportant un repli interne longitudinal Download PDF

Info

Publication number
WO1993015866A1
WO1993015866A1 PCT/SE1993/000084 SE9300084W WO9315866A1 WO 1993015866 A1 WO1993015866 A1 WO 1993015866A1 SE 9300084 W SE9300084 W SE 9300084W WO 9315866 A1 WO9315866 A1 WO 9315866A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
tubular member
tube
shaft
cutting head
Prior art date
Application number
PCT/SE1993/000084
Other languages
English (en)
Inventor
Yngve Sonefors
Original Assignee
Sandvik Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandvik Ab filed Critical Sandvik Ab
Publication of WO1993015866A1 publication Critical patent/WO1993015866A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/02—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of beds; of guiding arrangements for work-tables or saw carriers; of frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D49/00—Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
    • B23D49/10—Hand-held or hand-operated sawing devices with straight saw blades
    • B23D49/12—Hacksaws

Definitions

  • the present invention refers to a chamfering device accord ⁇ ing to preamble of claim 1, the object of which is to make 5 possible, in a simple way to attain chamfering, e.g. debur- ring of hole edges and other edges, which from operator's point of view are situated at the rear side or inner side of a workpiece.
  • the invention also incorporates a tool holder for such a chamfering device as defined in the preamble of 10 claim 5.
  • projecting flanges or the like may be accessible only from one direction.
  • the device may be designed as an attachment unit easy to mount and dismount to a power tool of standard type for driving a rotary bur or a milling cutter, whereby the initi ⁇ al costs for the device are reduced and whereby the power tool can be used also without the device according to the invention for performing working operations for which the latter is not intended.
  • the device allows rapid and complete exposure of the chuck or collet of the power tool for moun ⁇ ting or dismounting the rotary bur or the milling cutter.
  • By means of the device it is possible to follow curved working surfaces, such as the entire circumference of a hole, and to machine them without need for the operator to rotate the device in relation to the curvature in order to keep it correctly positioned against the working surface.
  • Fig. 1 is a lateral view, partly in section, of an embodi- ment of the device according to the invention.
  • Fig. 2 is a detail side view, partly in section, of the device equipped with a different additional equipment.
  • Fig. 3 and 4 are detail side views, partly in section show ⁇ ing examples of deburring holes made in the envelope sur-fa- ce of pipes.
  • Fig. 5 shows schematically and in section part of a cham ⁇ fering device in accordance with the invention and being equipped with a particularly favourable arrangement for easily adapting the device for treatment of workpieces of different wall thickness.
  • Fig. 6a - 6c are perspective views showing one member of a two-piece split intermediate spacing ring, forming part of the device according to Fig. 5, in three different axial sizes,
  • Fig. 6d and 6e show a two-piece split intermediate spacer ring, such as used in Fig. 5, in two different axial adjust- ment positions, and
  • Fig. 7 is a schematical sectional view, of part of a cham ⁇ fering device according to the invention, and having an adjustment arrangement of slightly other design than that according to Fig. 5 and being fitted to a chamfering device for deburring front edges.
  • a rotary shaft 2 provided with a key grip 3 for cooperation with a collet 5 having a hexagon head 4 projects from the front end of the power tool.
  • a rotary bur 6 which comprises a shaft 7 and a cutting head 8.
  • the bur shaft is surrounded with small play by a first tube 9, which has a thin-walled portion 9A and a stout portion 9B with larger outer diameter than portion 9A.
  • the cutting head 8 connects with a smaller end portion 8A to bur shaft 7 and increases successively in diameter towards a coarser end portion 8B.
  • the cutting edges of the head are shown curved in arc-form from the narrower portion 8A towards the coarser portion 8B, but they can also be straight, so that the cutting head will be conical, or they can be curved in opposite directions to be approximately ball shaped.
  • a second tube 10 surrounds the first tube 9 and is attached via a thread 11 to the front end of the power tool.
  • the tube 10 has a key grip 12 for tightening the thread joint.
  • the tube 10 adjoins with tight fit the coarse portion 9B of the first tube 9.
  • a groove 12 is machined in said coarse portion for cooperation with a locking ring 13 provided in a groove or in slots 14 in the second tube 10.
  • a third sleeve-formed or tubular member 15 arranged about the second tube 10 is axially displaceable along tube 10.
  • This third tube can be arrested in position relative to the second tube 10 by means of a knob-provided screw 16, acting against a locking ring 17 provided about the second tube.
  • a graduated scale 19 is provided on the second tube 10.
  • An annular support member 20 is provided on the third tube 15, and this is held in position by means of a locking ring 22 provided in a groove 21 therein, and which locking ring cooperates with a groove 23 machined in the third tube.
  • the locking rings 13 and 22 may preferably be provided with portions which deviate in a direction inwards from an other ⁇ wise circular form and thereby engage the grooves 12 and 23 resp., at the same time as their remaining portions engage the grooves 14 and 21 resp.
  • the reference number 24 designates an end surface of the support member 20, while 25 is a workpiece provided with a through-hole 26.
  • Fig. 2 shows the device according to the invention provided with a support member 27, designed differently from support member 20 shown in fig 1.
  • the member 27 has an annular por ⁇ tion 28, which is passed onto the third tube 15.
  • At two dia ⁇ metrically opposed sides of the portion 28 are provided radially extending holes 29. The centres of the holes are positioned so close to a lower end surface 30 of the portion 28, that this is broken through when the holes are made.
  • the support member 27 being made of a plastic material and the pins being inserted into the holes 29 with tight fit which gives high friction.
  • the pins 31 are preferably made of steel.
  • the end surface of the support member 27 can be divided into two portions 30a, 30b forming an angle to each other.
  • the designation 32 refers to the envelope surface of workpieces in the form of tubes, and 33 and 34 refer to the outer and the inner ends of a hole 35 in the different tubes.
  • the inner diameters of the second tube 10 and of the third tube 15 as well as the smallest inner diameters, of the support members 20 and 27 are all chosen so that they exceed the largest diameter of the cutting head 8.
  • Fig. 5 shows schematically in section a tool holder for a chamfering device, shown without power tool and from which portions have been omitted for the sake of clarity.
  • the tool holder according to this embodiment corresponds to that shown in Fig. 1 in that it incorporates a first tube 9, a second tubular element 10, which can be passed over the first tube 9 from the tool side thereof, and a third tubular member 15 which is displaceable on the second tube 10 in the axial direction thereof.
  • a support member 20 having a tubu ⁇ lar portion intended to be slid over and enclose the third tube 15, has a support surface 24 encircling the first tube 9 and being perpendicular thereto.
  • This support member 20 is lockable to the third tube 15 by means of an 0-ring 22 projecting radially above the envelope surface of the third tube 15 from an external peripheral groove 23 in said third tube and entering in a corresponding internal groove 21 in the support member 20.
  • the 0-ring 22 When the support member 20 with its tubular portion is slid up on the third tube the 0-ring 22 first will be compressed in its seat or groove 23 in the third tube, whereupon it will again flex out when the sup- port member 20 has been displaced so much that the groove 23 in the third tube and the groove 21 in the support member register. The support member then will be releasably locked in a predetermined position relative to the third tube 15.
  • a mechanism differing from that according to the embodiment of Fig.
  • this mechanism comprises an inter ⁇ mediate spacer ring 36 provided on the second tube 10 bet ⁇ ween a rearward end surface of the third tube 15 and an external, radial stop member 10A fitted to and projecting radially from the second tube 10.
  • the spacer ring 36 is exchangeable and in this embodiment consists of a two-piece ring 36a, 36b, which is split with a division line 37 having two helical portions each covering half the circumference of the ring and being interconnected by axial portions, the helical portions of said division line each having a saw ⁇ tooth shape.
  • the tubular portion of the support member 20 extends in its position, where it is locked to the third tube 15, over the intermediate spacer ring 36 and encloses this, thus that it will be situated between the surface of the second tube 10, the stop member 10A, the end surface of the third tube 15 and the inner surface of the tubular portion of the support member 20.
  • Figs. 6a to 6c show three spacer ring members 36a, 36a' and 36a' ' of the two-piece spacer ring 36 according to Fig. 5, said different spacer ring members having different length.
  • Figs. 6d and 6e show a mated pair of spacer ring members 36a' and 36b in two different mutual adjustment positions, and it is here clearly seen how the axial length of the two- piece spacer ring is different although the spacer ring members are the same in both examples.
  • Fig. 7 shows in a view corresponding to Fig. 5 a chamfering device adapted for deburring front edges of workpieces.
  • the device incorporates a first tube 9, a second tube 10 and a support member 38, interconnected in a manner mainly corre ⁇ sponding to that according to the earlier embodiments, al ⁇ though in this embodiment the third tubular member has been omitted and the different elements are not designed like those according to the embodiments shown in Fig. 1 or in Fig. 5.
  • the support member 38 in this embodiment is designed with a nose portion enclosing the centre of the tool position but leaving free a lateral space through which the side of a rotary bur or the like can be reached with the edge of a workpiece the front edge of which shall be chamfered or deburred.
  • the second tube 10 is fixedly connected to the first tube 9 by a screw joint or the like, whereas the support member 38 is rotatably supported rela ⁇ tive to the second tube 10 via rows of balls 39 provided in seats in the second tube 10, and arranged to act as ball bearings rotatably supporting the support member 38.
  • a steel ball 40 is provided in a circumferential groove in the second tube 10, thus that it projects radially from said groove, and it enters into a radial bore through the side wall of the third tube, thereby to prevent the support member 38 from sliding off the second tube axially.
  • the ball 40 is secured from falling out off the radial bore by a locking 0-ring 41 provided in a circumferential external groove on the third tube crossing the external opening of the said radial bore.
  • an exchangeable spacer ring 42 between the rear end of the second tube 10 and a rearward radial stop member 9C provided at the first tube 9.
  • This spacer ring 42 in this embodiment is shown in undivided form, and may be substituted for other spacer rings of different length.
  • the adjustment length required for chamfering front edges is not so big, whereby a few one-piece substitutable rings 42 mostly will be suffi ⁇ cient, but the spacer ring may also be made in two-piece form such as shown in Fig. 6a to 6e.
  • the first tube 9 is passed over a bur shaft 7 longer than the tube, thus that a rear portion of the bur shaft is free to be inserted in the collet of the power tool, in which it is clamped.
  • the second tube 10 is thereupon passed over the bur and the first tube and is tightened on the thread 11 at the front end 1 of the power tool.
  • the third tube 15 may already be affixed to the second tube, and also to the support member 20 or 27 and to the third tube, or alternatively these parts may be mounted afterwards.
  • the first tube When the second tube is affixed, the first tube will, due to the resistance from the locking ring 13, be pulled along upwards to engagement against the hexagonal head 4 of the collet. After having affixed the second tube the operator seizes, with his fingers, the protruding front portion 9a of the first tube and pulls it in a direction towards the cut- ting head 8, until the locking ring 13 snaps into the groove 12. The first tube is now arrested in position, so that it surrounds the bur shaft 7 with small clearance and with its front end almost reaching the cutting head 8.
  • the device according to the invention can now be used e.g. for deburring the lower or the rearmost edge of a hole 26 in a plane workpiece 25.
  • the position of the third tube 15 is set in relation to the thickness of the work piece, so that a correct distance is obtained between the lower side 24 of the support member 20 and the cutting head 8 of the bur.
  • the device After start of the power tool it is now possible to move the device around the periphery of the hole 26 in the workpiece, whereby the support surface 24 engages the top face of the workpiece and the portion 9A of the first tube engages the side wall of the hole.
  • the axially acting support member 20 and the radially acting support in form of the tube portion 9A thereby together define the depth of the engagement of the cutting head 8 into the hole edge, so that a uniform chamfer of predetermined depth is obtained around the entire periphery of the hole 26.
  • FIG. 3 shows the device according to the invention provided with the same support member 20 as shown in fig. 1.
  • the support member 20 will all the time rest on the highest point of the envelope surface 32 of the work piece. Therefore, if correct working depth has been set for the bur at the side of the hole where the cutting head 8 is indicated in dash lines, then the working depth will become incorrect when the bur has been brought a quar ⁇ ter of a revolution from said side to the position indicated by solid lines.
  • the device with a support means 27 according to the Fig. 2 embodiment. As shown in fig. 4, the device is kept positioned by the pins 31 of the support member being situated in transverse direction of the tubular workpiece. The lower side of the pins then follow the upper edge 33 of the hole 35 and give correct working depth to the cutting head 8 in the position where the pins 31 are shown in dash lines and also where they are shown in solid lines.
  • a support member 27 When using a support member 27 according to the embodiments and application examples in fig. 2 and 4, it may be suitable to mount the chamfering device in a support arm system of parallelogram type, which allows movement of the device in desired directions and at the same time prevents its tilt angle from being changed.
  • a support member 20 When using a support member 20 according to the embodiment in fig. 1, it may be preferable to make the support member, or at least the part of its end surface 24 intended to contact the workpiece, from a plastic material or the like, which does not scratch the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handcart (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Turning (AREA)
  • Sawing (AREA)
  • Clamps And Clips (AREA)

Abstract

L'invention concerne un cadre de scie conçu pour une lame de scie en forme de bande, comportant une partie arrière tubulaire (10) à section transversale fermée et au moins une poignée (11, 12). La partie arrière tubulaire (10) est pourvue d'un repli interne longitudinal (15) sur sa face inférieure (14), au moins au niveau des jonctions avec les poignées, afin d'améliorer la rigidité et la résistance.
PCT/SE1993/000084 1992-02-07 1993-02-03 Cadre de scie a section transversale tubulaire comportant un repli interne longitudinal WO1993015866A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9200351-6 1992-02-07
SE9200351A SE469929B (sv) 1992-02-07 1992-02-07 Sågbåge med sluten tvärsektion, försedd med ett längsgående inåtriktat veck

Publications (1)

Publication Number Publication Date
WO1993015866A1 true WO1993015866A1 (fr) 1993-08-19

Family

ID=20385239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1993/000084 WO1993015866A1 (fr) 1992-02-07 1993-02-03 Cadre de scie a section transversale tubulaire comportant un repli interne longitudinal

Country Status (2)

Country Link
SE (1) SE469929B (fr)
WO (1) WO1993015866A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE572918C (de) * 1933-03-24 Mueller Paul Saegebuegel aus einer im Querschnitt U-foermigen Blechschiene
US2849040A (en) * 1957-09-16 1958-08-26 Tideman Mfg Co Inc Hack saw

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE572918C (de) * 1933-03-24 Mueller Paul Saegebuegel aus einer im Querschnitt U-foermigen Blechschiene
US2849040A (en) * 1957-09-16 1958-08-26 Tideman Mfg Co Inc Hack saw

Also Published As

Publication number Publication date
SE9200351D0 (sv) 1992-02-07
SE469929B (sv) 1993-10-11
SE9200351L (sv) 1993-08-08

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