WO2004054746A1 - Scie a mouvement alternatif - Google Patents

Scie a mouvement alternatif Download PDF

Info

Publication number
WO2004054746A1
WO2004054746A1 PCT/DE2003/003820 DE0303820W WO2004054746A1 WO 2004054746 A1 WO2004054746 A1 WO 2004054746A1 DE 0303820 W DE0303820 W DE 0303820W WO 2004054746 A1 WO2004054746 A1 WO 2004054746A1
Authority
WO
WIPO (PCT)
Prior art keywords
lifting rod
lifting
saw according
saw blade
saw
Prior art date
Application number
PCT/DE2003/003820
Other languages
German (de)
English (en)
Inventor
Beat Gerber
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2004054746A1 publication Critical patent/WO2004054746A1/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
    • B23D51/08—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 devices for mounting straight saw blades or other tools
    • B23D51/10—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 devices for mounting straight saw blades or other tools for hand-held or hand-operated devices

Definitions

  • the present invention is based on a lifting saw machine according to the preamble of claim 1.
  • a lifting saw machine is known, the saw blade of which can be tensioned with spring means at the lower end of a reciprocating lifting rod, the tensioning device consisting of a minimum number of parts.
  • the known clamping device is very inexpensive and has an extremely low weight, the locking and locking function for holding the saw blade can still be improved.
  • the present invention with the features of claim 1 has the advantage that a lifting saw machine is thus created, the clamping device of which holds the saw blade securely in its working position and thereby enables the best sawing performance, the clamping device being an integral part of the lifting rod with only a minimal number of parts is inexpensive to manufacture.
  • the lifting rod has only a minimal weight and thus enables the lifting saw machine to run smoothly and free of vibrations during operation, with better maneuverability and a longer service life.
  • the lifting rod has a prismatic cross section, it is particularly simple and inexpensive to manufacture, in particular stamped from sheet metal, so that it has a weight that can hardly be reduced further. Because the lifting saw machine is intended for operation with a lifting saw blade with a clamping end with lateral cams, the clamping device can be designed particularly simply with high efficiency.
  • the individual parts of the tensioning device can be mounted directly on the lifting bar, secured against loss, without having to provide any noteworthy separate parts for receiving or storing the tensioning device.
  • the pushbutton that actuates the sliding wedge can be moved transversely and at the same time straight to the lifting rod, in particular perpendicularly to the flat side of the saw blade, the tensioning or releasing of the lifting saw blade is particularly simple and handy, and is safe from operator error. Due to the transverse arrangement of the sliding wedge and pushbutton in the lifting rod, the closing function of the tensioning device is not disturbed despite their up and down movement.
  • the sliding wedge is supported in a very secure position against the clamping direction of the saw blade on a frame-like transverse wall or end wall of the lower lifting rod end, it can transmit and hold maximum clamping forces on the lifting saw blade.
  • the lifting rod has a substantially central, axially parallel slot in its lower transverse wall and the side walls, and the slot ends in the side walls form V-shaped centering grooves for the saw blade cams, which can both support the saw blade cams in a centering manner and also secure the flat sides of the saw blade against deflection transverse to the sawing direction.
  • the clamping end of the saw blade can be centered with its tip in the lifting rod, regardless of the thickness of the respective saw blade type.
  • blind hole end is formed by an axially displaceable, elastically preloaded centering or pushing piece, saw blades produced with a large tolerance can also be securely clamped.
  • centering or thrust piece Due to the fact that the centering or thrust piece is preloaded downwards by a spring, it can deflect upwards or slide downwards depending on the tolerance deviations of the saw blade and thus center the saw blade securely.
  • the sliding wedge forms a frame, the front area of which has a clear width that is wider than the saw blade including its cams, this can pass freely through this front area for releasing from the tensioning device or for tensioning.
  • the sliding wedge Due to the fact that the rear area of the sliding wedge has a different internal width, which is only marginally wider than the saw blade and significantly narrower than the cam width, the sliding wedge can support the lower edges of the cams and thus securely clamp the saw blade.
  • FIG. 1 shows a side view of a lifting saw machine according to the invention
  • FIG. 2 shows a perspective view of the lifting rod end with a saw blade as a detail
  • FIG. 3 shows an enlarged illustration of the lifting rod with tensioning device
  • FIG. 4 shows an X-ray representation of FIG. 3
  • Figure 5 is an exploded view of Figure 3 and
  • FIG. 6 shows a saw blade for the saw according to the invention.
  • FIG. 1 shows a lifting saw machine 10 designed as a jigsaw hand-held machine tool with a motor housing 12 serving as a handle, which extends parallel to the feed direction and from which an electric cable 13 emerges from the rear region thereof.
  • the lifting saw machine 10 has a gear housing 14 flanged to the motor housing 12.
  • the motor housing 12, together with the gear housing 14, is mounted such that it can be adjusted in angle with respect to a base plate 16.
  • An unspecified motor transmits its rotary motion to a motor shaft 18, which ends in a shaft pinion 19.
  • a gear 20 meshes with the shaft pinion 19, which is mounted parallel to the motor shaft 18 and which rotatably takes along an eccentric pin serving as a crank 21. This engages in a link-like slider 22, which is firmly connected, in particular welded, to a prismatic lifting rod 24.
  • the lifting rod 24 is mounted in a straight and guided manner in an upper and a lower lifting rod guide 25, 26.
  • a tensioning device 32 for holding a saw blade 27 axially securely and without play. This is supported with the outermost edge or tip of its clamping end 28 at the top against a piston-like displaceable centering piece 33, against which a prestressed compression spring 34 is supported from the opposite side , The centering piece 33 is secured against falling down out of the lifting rod 24 by a transverse stop, not designated in any more detail. The position of this stop is calculated so that even saw blades with rough tolerance deviations resiliently pretensioned in terms of both length and thickness, so that their clamping ends can be tensioned in a centered manner.
  • FIG. 2 shows the lifting rod 24 with its lower lifting rod end 30 and with the clamping device 32 for the saw blade 27 as a detail.
  • the lifting rod 24 is designed as a square tube and thus prismatic. It is partially closed at the bottom by an end wall 31.
  • the lifting rod end 30 carries, on opposite sides, a window-like opening 36 running transversely to the axis.
  • a pushbutton 38 with a sliding wedge 40 is inserted through it and secured against loss.
  • the pushbutton 38, together with the sliding wedge 40 is slidably mounted transversely to the flat side of the saw blade 27 in accordance with the movement arrow 42.
  • the sliding wedge 40 is supported as a flat, drawer-like element downwards on the end wall 31 of the lifting rod end 30 in a positionally secured manner transversely to its lifting direction. Because the actuating direction of the tensioning device 32 extends transversely to the lifting direction of the lifting rod 24, the non-uniform lifting movement does not change the position of the sliding wedge 40 or the button 38, so that the tensioning force remains constant without being disturbed.
  • the lifting rod end 30 carries a central slot 44 which passes through its end wall 31, front wall 23 and rear wall 63 and ends in the front and rear walls 23, 63 in a V-shaped centering groove 46, in each of which a saw blade cam 29 of the saw blade clamping end 28 can be supported in a centered manner is.
  • the slot 44 continues upwards in the front and rear walls 23, 63 in an embossing groove 45.
  • FIG. 3 shows an enlarged X-ray representation of the lower lifting rod end 30 with the tensioning device 32, the frame-like shape of the sliding wedge 40 and its wedge surfaces 41 being particularly clearly recognizable, which engage under the saw blade cam 29 when the saw blade 27 is tensioned and up towards the centering piece 33 try to move, the tops of the saw blade cams 29 being self-centering in the centering grooves 46 of the slots 44.
  • the tip of the saw blade clamping end 28 is supported in a self-centering manner against the centering piece 33, which is prestressed downward elastically from above by means of a compression spring 34, in its centering center groove 35, which holds the tip of the saw blade clamping end 28 and thus fixes the saw blade 27 at three points, so that a optimal sawing with saw blade 27 tensioned without play is possible.
  • the frame-like sliding wedge 27 has a first region of narrow internal width, which is determined by the inner edges of the wedge surfaces 41 or the ramp-like walls carrying it, and a second region of larger internal width, which is larger in that the ramp-like walls carrying the wedge surfaces 41 are left free are.
  • the sliding wedge 40 moves to the left in the viewing direction, so that its first area with the wedge surfaces 41 pushes up under the cams 29 and tries to push the saw blade 27 axially upwards.
  • the tensioning movement of the sliding wedge 40 from right to left is effected by a prestressed compression spring 39 which is supported on the outside, on the right in the viewing direction, on the end wall of the sliding wedge 40.
  • Their pretensioning force is dimensioned such that the wedge surfaces 41 working in the self-locking area hold the saw blade 27 securely in the clamping position against unintentional loosening.
  • the push button 38 is pressed to the right in the viewing direction.
  • the sliding wedge 40 is displaced counter to the compression spring 39 until a stop edge 37 of the pushbutton 38 strikes the lifting rod 24 laterally.
  • the obliquely flat wedge surfaces 41 first detach from the saw blade cams 29 and move away from them. Then the second area of the sliding wedge 40 with the larger clear width comes under the saw blade 27. Then this can emerge from the sliding wedge 41 and thus emerge from the lifting rod 24 downwards, supported by the downward centering piece 33, so that the clamping device thereafter 32 is free to insert another saw blade.
  • FIG. 4 shows an enlargement of the lower lifting rod end 30 with the clamping device 32, the details described above, in particular the lateral openings 36, being particularly clearly recognizable. The other identical details previously described are not to be repeated.
  • the exploded drawing of the lower lifting rod end 30 according to FIG. 5 shows the lower end wall 31 of the lifting rod end 30 in a particularly clear manner. This closes the front side of the rectangular tubular lifting rod 24 at least partially downwards, namely up to the longitudinal slot 44 and gives the lower one Rod end 30 especially great deformation stability.
  • the lateral opening 36 can also be seen particularly clearly, the contour of which corresponds to that of the upper region of the saw blade clamping end 28.
  • FIG. 6 shows the contour of a saw blade 27 with a customary clamping end 28, the laterally projecting saw blade cams 29 of which are particularly advantageously suitable for the clamping device 32 selected here according to FIGS. 1 to 5.
  • Another exemplary embodiment of the invention has a parked or open position of the sliding wedge 40 for a more convenient one-handed saw blade change.
  • the centering piece 33 is displaced with the tip 50 of the clamping end 28 against the spring 34, the arms of the centering piece, not shown, detaching from the sliding wedge 40 so that the latter is returned to the closed position via the compression spring 39, i.e. in the direction of movement to the left.
  • This constructive measure enables one-handed operation of the jigsaw to change the saw blade and the operating convenience is further improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne une scie à mouvement alternatif (10) qui comporte : une tige de piston (24) allongée, effectuant un mouvement alternatif ; et une lame de scie (27) qui est sensiblement parallèle à la tige de piston, qui peut être tendue au moyen d'un dispositif tendeur (32) supporté par l'extrémité de tige de piston (30) et qui présente une extrémité de fixation (28). L'objectif de l'invention est de simplifier la conception de cette scie à mouvement alternatif et de rendre sa production plus économique. A cet effet, le dispositif tendeur (32) est formé uniquement par l'extrémité de tige de piston (30) et les pièces (33, 38, 39, 40) qui sont montées dans cette dernière de manière à effectuer un coulissement rectiligne, notamment un mouvement alternatif, sans aucune autre pièce auxiliaire. Le dispositif tendeur de cette scie à mouvement alternatif présente une fiabilité de fonctionnement, une qualité et une robustesse excellentes.
PCT/DE2003/003820 2002-12-17 2003-11-18 Scie a mouvement alternatif WO2004054746A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10258862.7 2002-12-17
DE2002158862 DE10258862A1 (de) 2002-12-17 2002-12-17 Hubsägemaschine

Publications (1)

Publication Number Publication Date
WO2004054746A1 true WO2004054746A1 (fr) 2004-07-01

Family

ID=32518995

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/003820 WO2004054746A1 (fr) 2002-12-17 2003-11-18 Scie a mouvement alternatif

Country Status (2)

Country Link
DE (1) DE10258862A1 (fr)
WO (1) WO2004054746A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236233A1 (fr) * 2009-04-03 2010-10-06 Mafell AG Scie sauteuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719569A1 (fr) 2005-05-03 2006-11-08 Metabowerke GmbH Dispositif pour serrer un outil à mouvement alternatif et appareil muni d'un tel dispositif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103565A (en) * 1991-09-26 1992-04-14 Skil Corporation Blade holder for reciprocating saws
DE19532494A1 (de) * 1995-09-02 1997-03-06 Festo Tooltechnic Kg Schnellspannvorrichtung an einer Bearbeitungsmaschine
EP0855239A1 (fr) * 1997-01-24 1998-07-29 FESTO Tooltechnic GmbH & Co. Dispositif de serrage rapide pour un outil dans une machine d'usinage
JP2000084729A (ja) * 1998-09-14 2000-03-28 Makita Corp 往復切断工具の刃具クランプ装置
DE10106051A1 (de) * 2001-02-09 2002-08-14 Hilti Ag Schnellspanneinrichtung für Sägeblätter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103565A (en) * 1991-09-26 1992-04-14 Skil Corporation Blade holder for reciprocating saws
DE19532494A1 (de) * 1995-09-02 1997-03-06 Festo Tooltechnic Kg Schnellspannvorrichtung an einer Bearbeitungsmaschine
EP0855239A1 (fr) * 1997-01-24 1998-07-29 FESTO Tooltechnic GmbH & Co. Dispositif de serrage rapide pour un outil dans une machine d'usinage
JP2000084729A (ja) * 1998-09-14 2000-03-28 Makita Corp 往復切断工具の刃具クランプ装置
DE10106051A1 (de) * 2001-02-09 2002-08-14 Hilti Ag Schnellspanneinrichtung für Sägeblätter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 06 22 September 2000 (2000-09-22) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236233A1 (fr) * 2009-04-03 2010-10-06 Mafell AG Scie sauteuse

Also Published As

Publication number Publication date
DE10258862A1 (de) 2004-07-15

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