EP0012404B1 - Kreissäge mit einem Spaltkeil - Google Patents

Kreissäge mit einem Spaltkeil Download PDF

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Publication number
EP0012404B1
EP0012404B1 EP79105023A EP79105023A EP0012404B1 EP 0012404 B1 EP0012404 B1 EP 0012404B1 EP 79105023 A EP79105023 A EP 79105023A EP 79105023 A EP79105023 A EP 79105023A EP 0012404 B1 EP0012404 B1 EP 0012404B1
Authority
EP
European Patent Office
Prior art keywords
riving knife
riving
link
saw blade
circular saw
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP79105023A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0012404A1 (de
Inventor
Adolf Zaiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl M Reich Maschinenfabrik GmbH
Original Assignee
Karl M Reich Maschinenfabrik 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 Karl M Reich Maschinenfabrik GmbH filed Critical Karl M Reich Maschinenfabrik GmbH
Priority to AT79105023T priority Critical patent/ATE3382T1/de
Publication of EP0012404A1 publication Critical patent/EP0012404A1/de
Application granted granted Critical
Publication of EP0012404B1 publication Critical patent/EP0012404B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates

Definitions

  • the invention relates to a circular saw according to the preamble of claim 1.
  • a circular saw is known from DE-B-1202964.
  • the riving knife must normally be present for the safety of the operator, there is occasionally a need to remove the riving knife for certain jobs. So e.g. in the production of cutouts in plate-shaped workpieces, the saw blade having to be immersed in the workpiece from the surface. Or if you have to saw backwards on certain occasions.
  • the riving knife would prevent the desired working movement and must therefore be removed.
  • the riving knife would have to be reattached.
  • this is often forgotten or omitted for convenience so that the operator can be seriously endangered and injured by kickback workpieces.
  • FR-A-2 087 454 proposed to arrange the riving knife on a cover plate which is pivotally attached to the protective hood of the saw. In this arrangement, however, there is no compulsory tracking of the riving knife, which only partially covers the saw blade to the rear and is therefore unusable when used with hand-held circular saws.
  • the object of the invention is to design the circular saw of the type under consideration so that the riving knife can perform a pivoting movement that is independent of the forced tracking when the saw blade is pivoted and is able to automatically return to its protective position.
  • the riving knife is pivoted behind the contact surface against the action of a restoring force when the saw blade is immersed in the workpiece and slides into the slot created by the saw blade during further forward sawing. This ensures that the required riving knife is available for further sawing work and that the operator cannot be endangered.
  • the circular saw designed in this way thus has at least one additional degree of freedom in the quadrilateral joint.
  • this additional degree of freedom is formed in that the second rocker of the four-bar linkage has a length that can be changed against a restoring force.
  • a bearing of the four-bar linkage is designed to be movable.
  • a releasable locking between the riving knife and circular saw can be provided, which prevents the free relative movement between the riving knife and the highest point of the saw blade in the locking position.
  • the lock To use such a circular saw for plunge work, the lock must be released so that the riving knife can swing back behind the platen. If the riving knife then slides into the saw slot when sawing further, it can be provided that the locking mechanism engages automatically and must be released again the next time it is immersed. It can also be provided that the riving knife without a restoring force, e.g. Spring, weight, magnetic or hydraulic, can be adjusted by hand and locked at the end points.
  • a restoring force e.g. Spring, weight, magnetic or hydraulic
  • the riving knife according to the invention has the advantage that it can be attached to portable circular saws as well as to stationary table saws.
  • FIG. 1 to 3 schematically show hand-held circular saws with a pivotably mounted motor mount and tracking device for the riving knife, various exemplary embodiments for the movement of the riving knife being shown.
  • the first rocker arm 15 of a motor housing 16 is pivotably mounted on a support plate 11 with a support flange 12 on a bearing 13 or 14 for adjusting the cutting height of the saw blade 17.
  • a riving knife carrier 19 is pivotally mounted on the motor housing 16 concentrically to the axis 18 of the saw blade 17, on which a riving knife 20 is removably fastened.
  • the highest point 21 of saw blade 17 projects beyond riving knife 20 by a certain amount.
  • the riving knife carrier 19 is designed as an angle lever, on the carrier arm 22 of which the riving knife 20 is fastened and the other arm of which Coupling 23 forms, on the joint 24 a second rocker 25 (Fig. 1) or 26 (Fig. 3 and 4) is pivotally attached. Swing arms 25 and 26 are connected at their other end to the support plate 11 via joints 27, 28 and 29, respectively.
  • the imaginary connecting line between the joints 13-27, 14-28 and 13-29 form in a known manner with the driven first rocker 15, the coupling 23 and the second rocker 25 and 26, a quadrilateral joint, which when the motor housing 16 is pivoted to Adjustment of the cutting height of the saw blade 17 tracks the riving knife 20 so that the determined distance between the highest point 21 and the riving knife remains constant.
  • the second rocker 25 has a sleeve 30 which is pivotably attached to the joint 27.
  • a rod 31 is slidably mounted in sleeve 30, a compression spring 34 being arranged between a plate 32 of rod 31 and an end wall 33 of sleeve 30.
  • Rod 31 is pivotally connected to the joint 24 and plate 32 is pressed in the rest position by compression spring 34 against the other end wall 35 of sleeve 30.
  • the arrangement shown in Fig. 1 ensures the tracking of the riving knife 20 when adjusting the cutting height. If the circular saw is used for plunge sawing, the riving knife 20 is pivoted from the surface of the workpiece against the action of the compression spring 34 into the position shown in broken lines in FIG. 1. After a sawing gap has been formed, the compression spring 34 automatically guides the riving knife 20 into this sawing gap.
  • the joint 28 is not connected to the support plate 11, but is pivotally connected to an intermediate member 36 with the bearing 14 attached to the support plate 11.
  • a tension spring 37 is fastened between the intermediate member 36 and the bracket 38 of the support plate 11 and pulls the intermediate member 36 against a stop cam 39 of the bracket 38.
  • the riving knife 20 can be pivoted when immersed in the direction of the support surface 12 and returns automatically after the formation of a sawing gap his rest position back.
  • the joint 29 is mounted in an arcuate slot 40 in a bracket 41 of the support plate 11.
  • a collar bolt 43 engages in a bore 42 of the rocker arm 26, which is slidably mounted in the slot 40 and can be clamped to the bracket 41 with a wing nut 44.
  • the additional degree of frieze can thus be eliminated by an intervention by the operator and the movement of the riving knife can be restricted to the tracking movement.
  • the wing nut 44 is loosened, the displaceable mounting of the joint 29 in the slot 40 allows the riving knife 20 to be pivoted in the direction of the support surface 12 when the saw blade 17 is immersed.
  • FIG. 5 A modification of the embodiment shown in FIG. 2 is shown in FIG. 5.
  • the bearing 14 is designed as a double joint on which both the first rocker arm 15 for which the motor housing 16 and the intermediate member 36 are pivotably mounted.
  • the intermediate member 36 is fastened to a bearing pin 45 which is rotatably mounted in the bracket 38 and with which a setting wheel 47 is fixedly connected with a pin 46.
  • a helical spring 48 is arranged between the adjusting wheel 47 and the bracket 38 and holds the intermediate member 36 in the rest position shown in FIG. 2 via the bearing pin 45.
  • a locking pin 50 is slidably mounted in a bore 49 of the adjusting wheel 47. It has two grooves into which a spring-loaded ball 52 engages, the adjusting wheel 47 being freely rotatable in the release position of locking bolts 50 and the locking bolt 50 engaging in a locking position in a bore 53 in console 38 and thus adjusting wheel 47 with console 38 locked up. In this locking position, the additional degree of freedom of riving knife 20 is canceled again.
  • FIG. 6 The use of the riving knife described in a stationary table saw is shown in FIG. 6.
  • a first rocker 57 of the motor housing 58 with a saw blade 59 is pivotably mounted on a bearing 56 again.
  • the riving knife 60 is detachably fastened to an arm of a riving knife carrier 61, the other arm of which forms a coupling 62 of a four-bar linkage, which is supplemented by a second rocker arm 63, which corresponds to the second rocker arm 25 of FIG. 1 and on the joint 64 of the bracket 54 and Joint 65 of coupling 62 is pivotally mounted.
  • Stationary table saws are usually provided with a protective hood that can be pivotally attached to the end of riving knife 60. This protective hood must be removed to use the riving knife described.
  • the riving knife 60 When a workpiece 66 is folded, the riving knife 60 then assumes the position shown in solid lines in FIG. 6, while it returns to the rest position shown in dash-dot lines after the workpiece has been lifted off.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
EP79105023A 1978-12-16 1979-12-10 Kreissäge mit einem Spaltkeil Expired EP0012404B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79105023T ATE3382T1 (de) 1978-12-16 1979-12-10 Kreissaege mit einem spaltkeil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2854369 1978-12-16
DE2854369A DE2854369C2 (de) 1978-12-16 1978-12-16 Kreissäge mit Spaltkeil

Publications (2)

Publication Number Publication Date
EP0012404A1 EP0012404A1 (de) 1980-06-25
EP0012404B1 true EP0012404B1 (de) 1983-05-18

Family

ID=6057363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79105023A Expired EP0012404B1 (de) 1978-12-16 1979-12-10 Kreissäge mit einem Spaltkeil

Country Status (5)

Country Link
EP (1) EP0012404B1 (es)
AT (1) ATE3382T1 (es)
CA (1) CA1113837A (es)
DE (1) DE2854369C2 (es)
ES (1) ES486928A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101903144B (zh) * 2007-12-21 2013-04-24 罗伯特.博世有限公司 圆锯
US12083613B2 (en) 2022-10-18 2024-09-10 Techtronic Cordless Gp Track saw including plunge lockout mechanism

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3206419A1 (de) * 1982-02-23 1983-09-01 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Saegeaggregat
DE3912307A1 (de) * 1989-04-14 1990-10-25 Metabowerke Kg Kreissaege mit spaltkeil
DE3933261A1 (de) * 1989-10-05 1991-04-18 Bosch Gmbh Robert Handkreissaege
DE4010456A1 (de) * 1990-03-31 1991-10-02 Elektra Beckum Lubitz & Co Saegeeinrichtung mit einer um 180(grad) wendbar gelagerten grundplatte
GB2273078A (en) * 1992-12-04 1994-06-08 Black & Decker Inc Adjustable riving knife
US5381233A (en) * 1993-03-03 1995-01-10 National Tsing Hua University Polarized-light scatterometer for measuring the thickness of a film coated on the partial of a substrate
US5481806A (en) * 1994-06-27 1996-01-09 Pratt; Edgar L. Tongue attachment for circular saw
DE19635527A1 (de) * 1996-08-20 1998-02-26 Black & Decker Inc Tauchsäge
US7437981B2 (en) 2005-11-21 2008-10-21 Robert Bosch Gmbh Modular guard system and apparatus for a power saw
US7600456B2 (en) 2005-11-21 2009-10-13 Robert Bosch Gmbh Modular guard system for a power saw
US8127648B2 (en) 2008-07-31 2012-03-06 Robert Bosch Gmbh Table saw guard system
DE102012005165A1 (de) * 2012-03-16 2013-09-19 Festool Group Gmbh & Co. Kg Hand-Trennmaschine
DE102012005173A1 (de) * 2012-03-16 2013-09-19 Festool Group Gmbh & Co. Kg Hand-Trennmaschine
DE102012005169A1 (de) * 2012-03-16 2013-09-19 Festool Group Gmbh & Co. Kg Hand-Trennmaschine
DE102013101480A1 (de) 2013-02-14 2014-08-14 Wolfcraft Gmbh Sägetischplatte mit daran befestigbarem Spaltkeil
DE102016103152A1 (de) * 2016-02-23 2017-08-24 Eberhard Berhalter Werkzeugmaschinenvorrichtung
DE102017201493A1 (de) * 2017-01-31 2018-08-02 Robert Bosch Gmbh Kreissäge, insbesondere Handkreissäge
DE102019119230A1 (de) 2019-07-16 2021-01-21 Homag Gmbh Aggregat für Nut- und Trennschnittbearbeitung mit Späneleitfunktion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202964B (de) * 1957-12-19 1965-10-14 Reich Maschf Gmbh Karl Handkreissaege mit Spaltkeil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1435252A (en) * 1919-12-17 1922-11-14 John C Haswell Separating device for sawing machines
US1602040A (en) * 1925-03-05 1926-10-05 Stover Lumber Company Separating device for resawing machines
US1711490A (en) * 1927-09-12 1929-05-07 William D Drummond Saw guard
US2530867A (en) * 1949-03-28 1950-11-21 Galanga Charles Spreaders for circular saw wood cutting machines
US2518684A (en) * 1949-04-21 1950-08-15 Hyman M Harris Duplex bench saw
US2916062A (en) * 1958-09-18 1959-12-08 Dormeyer Corp Splitter for portable electric saw
CH393716A (de) * 1959-07-24 1965-06-15 Metabowerke Kg Kreissäge mit einem dem Sägeblatt nachgeschalteten Spaltkeil
FR2087454A5 (es) * 1970-05-20 1971-12-31 Guilliet Ets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202964B (de) * 1957-12-19 1965-10-14 Reich Maschf Gmbh Karl Handkreissaege mit Spaltkeil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101903144B (zh) * 2007-12-21 2013-04-24 罗伯特.博世有限公司 圆锯
US12083613B2 (en) 2022-10-18 2024-09-10 Techtronic Cordless Gp Track saw including plunge lockout mechanism

Also Published As

Publication number Publication date
DE2854369C2 (de) 1983-10-20
EP0012404A1 (de) 1980-06-25
DE2854369A1 (de) 1980-06-19
CA1113837A (en) 1981-12-08
ES486928A1 (es) 1980-05-16
ATE3382T1 (de) 1983-06-15

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