EP0642895A1 - Kombinierte Tisch- und Gehrungssäge - Google Patents

Kombinierte Tisch- und Gehrungssäge Download PDF

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Publication number
EP0642895A1
EP0642895A1 EP94305874A EP94305874A EP0642895A1 EP 0642895 A1 EP0642895 A1 EP 0642895A1 EP 94305874 A EP94305874 A EP 94305874A EP 94305874 A EP94305874 A EP 94305874A EP 0642895 A1 EP0642895 A1 EP 0642895A1
Authority
EP
European Patent Office
Prior art keywords
pivot
saw
axis
pivot member
slot
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.)
Granted
Application number
EP94305874A
Other languages
English (en)
French (fr)
Other versions
EP0642895B1 (de
Inventor
Andrea Garuglieri
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0642895A1 publication Critical patent/EP0642895A1/de
Application granted granted Critical
Publication of EP0642895B1 publication Critical patent/EP0642895B1/de
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/165—Convertible sawing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/18—Saw benches with feedable circular saw blade, e.g. arranged on a carriage
    • B27B5/20—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage

Definitions

  • This invention relates to chop saws and particularly to a combination mitre and table saw, otherwise known as a flip-over saw.
  • the invention relates to such a saw which is capable of making bevel cuts in both its table saw mode and mitre saw mode.
  • Mitre saws usually, and table saws always, require a slot to be provided in the workpiece support or table, through which the saw blade will pass.
  • the saw blade passes through the slot in the workpiece support once it has cut through the workpiece; in a table saw, the saw blade is mounted below the workpiece support and passes through the slot so as to present a cutting edge above the workpiece support, to which the workpiece may be presented.
  • the slot in the workpiece support is generally to be kept as narrow as possible.
  • the slot in the workpiece support When a saw, whether it be a mitre saw or a table saw, is capable of making bevel cuts at a variety of different bevel angles, the slot in the workpiece support must be capable of accommodating the saw blade at any one of that variety of angles. Since the critical width of the slot in the workpiece support is its width at the surface of the workpiece support which is actually supporting the workpiece, namely the upper surface, the requirement for minimal damage to the workpiece has led to the axis about which the saw blade pivots, in order to alter the bevel angle at which it is cutting, being arranged to coincide with the upper surface of the workpiece support. An example of a mitre saw which includes such an arrangement is described and illustrated in US-A-4537105.
  • the workpiece support includes a bearing block having a part circular guide slot.
  • the saw blade mounting includes a similar bearing block and the two bearing blocks co-operate to allow relative arcuate movement about the centre of curvature of the guide slot.
  • the centre of curvature of the guide slot coincides with the top of the slot in the workpiece support.
  • US-A-4531441 illustrates and describes a combination table and mitre saw, i.e. a flip-over saw, which utilizes a similar bevel pivot arrangement.
  • the bevel axis of the saw blade is arranged to coincide with the upper surface of the workpiece support when the saw is operating as a table saw. Consequently, when the saw is operating as a mitre saw, the bevel pivot axis coincides with the lower surface of the workpiece support. Accordingly, when operating as a mitre saw, this saw gives relatively poor protection to the workpiece against damage caused by emergence of the saw blade.
  • the bevel angle is adjustable between ⁇ 45° from the vertical, this will require that the slot in the workpiece support, when the saw is operating as a mitre saw, being at least twice as wide as the workpiece support is thick.
  • the present invention provides a saw comprising a frame, a table mounted in the frame having first and second substantially planar parallel opposed table surfaces, the table being pivotable in the frame between two positions, a pivot block mounted on said first surface, a pivot member pivotally mounted on said pivot block for pivoting about a first axis substantially parallel and within the confines of said first and second surfaces, a saw assembly mounted on said pivot member and comprising a saw blade lying in a plane containing said first axis, a slot in the table adapted to receive said blade to enable cutting of workpieces supported on either surface of the table, and clamp means to clamp said pivot member and block together, wherein said first axis is defined by first and second opposed arcuate pivot surfaces between said pivot member and one or both of said table and pivot block, at least the first pivot surface being defined between said first and second table surfaces.
  • Said pivot surfaces may comprise a bore in a projection of said pivot member and a pin spanning a slot in the table, said projection being received in said slot.
  • said first pivot surface is defined by a part substantially cylindrical surface of a projection of said pivot member and a part substantially cylindrical surface of a recess formed in said table, said projection being received in said slot.
  • said second pivot surface may comprise another part substantially cylindrical surface on said projection and a part substantially cylindrical surface on said pivot block above said first surface.
  • pivot axis is intermediate said first and second surfaces and most preferably centrally between them so that the slot entrance at either surface can be minimised.
  • said part substantially cylindrical surface of the recess subtends an angle of 180° less the angle of pivot required of the pivot member about said first axis.
  • said projection is supported axially against movement thereof.
  • Said axial support may comprise a radial surface with respect to said first axis being formed in said recess. Adjustment means may be provided to adjust axially said radial surface.
  • Said adjustment means may comprise a wedge section received in said table at the end of said recess and forming said first radial surface, and screw means received in said wedge section and adapted to draw said section axially with respect to said first axis.
  • the pivot block preferably also co-operates with the pivot member to allow sliding arcuate relative motion of the pivot block and the pivot support about the first axis.
  • said clamp means comprises the pivot block having an arcuate slot and the pivot member having a locating pin, such as a releasable bolt which is operable to secure the pivot member to the pivot block.
  • said pivot member further comprises a pivot guide mounted on the pivot block on the side thereof remote from the pivot member and between which the pivot block is clamped when said releasable bolt is tightened.
  • Said pivot guide serves, inter alia, to close the arcuate slot in the pivot block and prevent the ingress of dust.
  • the pivot member includes stop surfaces adapted to abut the table to limit the relative rotation of one with respect to the other in both directions.
  • a saw 10 comprises a saw assembly 20 mounted on a workpiece support or table 16.
  • the mounting is such as to allow pivotal motion of the saw assembly 20 relative to the table 16 about two spaced, orthogonal axes 28,92.
  • a pivot support 26 is pivotally mounted on the workpiece support or table 16 about an axis 92 which is parallel to the upper and lower surfaces of the workpiece support 16 and coincident with the plane of the saw blade, in a manner which will be more particularly described with reference to Figures 2 and 3.
  • the saw assembly 20 is itself pivotally mounted on the pivot support 26 about a second axis 28 which is perpendicular both to the first axis 92 and to the plane of the saw blade. Pivoting about the second axis 28 enables the saw assembly 20 to be raised and lowered and to allow a saw blade under a lower guard 36 to engage and cut a workpiece supported on the table 16 against a fence 17.
  • a circular portion of the table 16 is rotatable about a vertical axis with respect to the remainder of the table.
  • the saw assembly 20 rotates with the circular portion of the table 16.
  • the fence 17 is fixed in position on the remainder of the table 16.
  • the saw can be rendered a table saw by plunging the blade into a slot (not shown) in the table and locking the saw assembly in this position.
  • the table 16 is then pivoted by means (not shown) through 180° so that the undersurface of the table is then uppermost and the saw blade protrudes from beneath.
  • Such a saw was first described in DE-A-1628992, although a preferred pivot arrangement for the table 16 is described in our copending British application number 9218363.1.
  • Pivoting of the saw assembly 20 about the first axis 92 enables the saw 10 to make bevel cuts when acting as a mitre saw or when acting as a table saw.
  • pivoting of the pivot support 26, and hence of the saw assembly 20, about the first axis 92 is controlled by two concentric opposing pivot surfaces (described further below) centred on the pivot axis 92.
  • the use of dual concentric pivot surfaces reduces substantially the likelihood of any unwanted floating of the bevel axis.
  • the pivot member 26 has a bolt 17 passing through it and this bolt 170 is received within an arcuate slot 173 in the pivot block 27.
  • the bolt 170 is adapted to secure the pivot support 26 to the pivot block 27, and is releasable.
  • the bolt 170 is provided with a handle 172 and co-operates with a captive nut or other captive thread in known manner.
  • the bolt 170 may be such as is described in our British Patent Application No. 9218366.4.
  • said concentric opposing pivot surfaces are formed by a pin or spindle 92' which is recessed into the rotatable portion of the workpiece support or table 16 and which laterally spans a semicircular recess 90 therein.
  • the pivot support 28 has a corresponding lug or projection 88 which is received in the semicircular recess 90, and through which the spindle 92' passes.
  • This arrangement provides for stable pivoting, and also locates the first axis 92 between the surfaces of the workpiece support 16, in this case centrally between the surfaces, so as to enable the width of the slot (not shown) in the workpiece support 16, which is necessary for passage of the saw blade, to be kept to a minimum.
  • a further degree of stability for the bevel pivot is afforded by the fact that the lug 88 of the pivot support 26 is tightly received within the semicircular recess 90, thereby preventing unwanted axial movement.
  • FIGS. 2b and 3b illustrate a second and preferred bevel pivot arrangement.
  • the pivot lug 88 is simply received in a correspondingly shaped, semicircular recess 90 in the rotatable portion of the table 16.
  • the pivot block 27 and the pivot lug 88 each support a part-cylindrical surface 130,132, the surface 130 carried by the pivot block being press-formed on a plate 134 attached thereto.
  • the surface 130 carried by the pivot block 27 faces towards the first axis 92; the other surface 132 faces away.
  • both the lug 88 and recess 90 arrangement and the pair of part-cylindrical surfaces 130,132 provide for pivoting about the first axis 92 and co-operate to provide a stable pivot axis.
  • the lug 88 is axially supported against movement by the ends of the recess 90. Towards the pivot block 27 there is a small clearance between the lug 88 and end 91 of the recess which is not taken up when the clamp bolt 170 is tightened. However, the lug may abut that end when the saw is in its bench saw mode and the bolt 170 is overly loosened. However the flexibility in the plate 134 in the region of its surface 130 can accommodate torsion loads without permanent damage to the table or lug being caused. At the other end, a nylon or like material wedge 180 is secured by a screw 182.
  • the pivot support 26 is also provided with a pair of stop surfaces 174,176 which respectively limit movement of the pivot support by abutting the table 16 when the pivot support 26 is vertical and inclined at an angle of 45° with respect to the table or workpiece support 16.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
EP19940305874 1993-08-12 1994-08-08 Kombinierte Tisch- und Gehrungssäge Expired - Lifetime EP0642895B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939316730A GB9316730D0 (en) 1993-08-12 1993-08-12 Combination mitre and table saw
GB9316730 1993-08-12

Publications (2)

Publication Number Publication Date
EP0642895A1 true EP0642895A1 (de) 1995-03-15
EP0642895B1 EP0642895B1 (de) 1997-06-04

Family

ID=10740360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940305874 Expired - Lifetime EP0642895B1 (de) 1993-08-12 1994-08-08 Kombinierte Tisch- und Gehrungssäge

Country Status (5)

Country Link
EP (1) EP0642895B1 (de)
JP (1) JPH07148703A (de)
CA (1) CA2129884A1 (de)
DE (1) DE69403591T2 (de)
GB (1) GB9316730D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614493A1 (de) * 2004-07-08 2006-01-11 BLACK & DECKER INC. Gehrungssäge mit einem drehbaren Tisch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7752951B2 (en) 2006-09-18 2010-07-13 Normand Ouellette Convertible circular saw apparatus usable as either a miter saw or a table saw

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028226A (en) * 1978-08-10 1980-03-05 Ottaviani L Rotary table for a power tool especially a saw
US4531441A (en) * 1981-02-19 1985-07-30 Eugen Lutz Gmbh & Co. Maschinenfabrik Combination table and miter saw

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028226A (en) * 1978-08-10 1980-03-05 Ottaviani L Rotary table for a power tool especially a saw
US4531441A (en) * 1981-02-19 1985-07-30 Eugen Lutz Gmbh & Co. Maschinenfabrik Combination table and miter saw

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1614493A1 (de) * 2004-07-08 2006-01-11 BLACK & DECKER INC. Gehrungssäge mit einem drehbaren Tisch
CN100411789C (zh) * 2004-07-08 2008-08-20 布莱克和戴克公司 锯

Also Published As

Publication number Publication date
EP0642895B1 (de) 1997-06-04
DE69403591T2 (de) 1997-09-18
DE69403591D1 (de) 1997-07-10
CA2129884A1 (en) 1995-02-13
GB9316730D0 (en) 1993-09-29
JPH07148703A (ja) 1995-06-13

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