EP0101734B1 - Chevalet de sciage - Google Patents

Chevalet de sciage Download PDF

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Publication number
EP0101734B1
EP0101734B1 EP19830901932 EP83901932A EP0101734B1 EP 0101734 B1 EP0101734 B1 EP 0101734B1 EP 19830901932 EP19830901932 EP 19830901932 EP 83901932 A EP83901932 A EP 83901932A EP 0101734 B1 EP0101734 B1 EP 0101734B1
Authority
EP
European Patent Office
Prior art keywords
saw
board
guide member
jig
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.)
Expired
Application number
EP19830901932
Other languages
German (de)
English (en)
Other versions
EP0101734A1 (fr
Inventor
Anthony Frederick Blaine
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.)
Prutec Ltd
Original Assignee
Prutec Ltd
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 Prutec Ltd filed Critical Prutec Ltd
Priority to AT83901932T priority Critical patent/ATE21060T1/de
Publication of EP0101734A1 publication Critical patent/EP0101734A1/fr
Application granted granted Critical
Publication of EP0101734B1 publication Critical patent/EP0101734B1/fr
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
    • B27G19/10—Measures preventing splintering of sawn portions of wood
    • 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
    • B27G5/00—Machines or devices for working mitre joints with even abutting ends
    • B27G5/02—Machines or devices for working mitre joints with even abutting ends for sawing mitre joints; Mitre boxes

Definitions

  • the present invention relates to a saw jig to assist in sawing of boards and finds particular application in the sawing of laminated board.
  • the present invention seeks to provide a saw jig which mitigates the above disadvantages and enables a person using a hand saw to produce a clean and straight cut made without damaging the surfaces of the board.
  • a saw jig for cutting a board comprising a member defining a slot for a saw blade, the slot being of substantially the same width as the saw blade, and means for securing the member on the blade exit side of the board, the corners of the member defining the slot being held during use in intimate contact with the surface of the board whereby to prevent chipping, wherein the member is formed in two halves spaced from one another by the slot, whereby the slot may receive the blade of a hand saw and guide the said hand saw to follow the desired line of cut, and wherein the separation between the halves of the guide member is adjustable so as to enable the use of saw blades of differing thicknesses.
  • a saw jig for cutting a board comprising a member defining a slot for a saw blade, the slot being of substantially the same width as the saw blade, and means for holding the member against the blade exit side of the board, the corners of the guide member defining the slot being held during use in intimate contact with the surface of the board so as to prevent chipping.
  • This Patent offers a solution to the problem of the chipping but is only applicable to a power saw because the slot does not extend through the width of the member and cannot consequently be used with a hand saw. Furthermore, the slot does not guide the power saw, which is separately guided, and acts only to inhibit chipping.
  • the saw guide may be used accurately adjusted to the width of the saw blade so that a neat cut may be obtained with saw blades of differing thicknesses.
  • the saw guide is intended to be capable of being use with a hand saw, it can be used with a power saw.
  • the teeth are angled away from the user so that the chipping of the laminate board tends to occur on the undersurface of the board.
  • the teeth are so angled as to pull the board against the circular saw with the result that the chipping tends to occur on the top surface.
  • the term "exit side" of the board is that side at which chipping tends to take place being the side on which the saw leaves the board after performing a cutting stroke.
  • the edges of the guide member for the saw press against the surface of the board which is prone to chipping or splintering and no separation of the laminate from the support board can take place beyond the line of contact between the guide member and the surface of the board.
  • the invention may be used with other boards prone to chipping or splintering including chip board, fibre board, hardboard, plywood and the term "board" as used herein is intended to include all such materials.
  • guide members are provided both on the entry and exit side of the saw blade, the guide member on the entry side having a slot of the substantially the same width as the saw blade aligned with the slot in the guide member on the exit side and ensuring that the blade remains in the desired plane relative to the surface of the board.
  • the slot defining edges of the guide member on the exit side of the board may in time become damaged by the saw blade. It is therefore preferred that the guide members should have replaceable corner strips releasably secured to the body of the guide members.
  • corner strips In order to ensure that the edges of the corner strips are urged into intimate contact with the board surface, it is desirable that the corner strips should be urged resiliently in the direction of the board. This may, for example, be achieved by placing a foamed plastics layer between the guide member and the corner strips.
  • the corner strips may be formed of metal softer than the metal of the blade but it has been found, surprisingly, that a plastics strip is equally effective, causes no damage to the saw blade and is long lasting.
  • the plastics corner strips or inserts may be retained on guide members made of any suitable material, for example the guide members may be formed of aluminium or plastics extrusions, or rolled steel section.
  • the corner inserts may be formed with a bead received in a channel.
  • the shape of the strip may be such that the slot defining edges lie spaced from the surface of the guide member, so as to be urged in the direction of the board surface.
  • the saw guide shown in Figs 1 to 3 comprises a first guide member 10 formed in two halves, designated 10a and 10b, respectively.
  • the two halves are secured to one another at their upper and lower ends by set screws 31 and 30, respectively, shown in more detail in Figures 2 and 3.
  • the upper ends of the guide member halves 10a, 10b are pivotably connected to a generally U-shaped stand 12, which folds flat when the jig is not in use.
  • the two halves 10a and 10b of the guide member 10 when in use, are spaced apart to define a slot 14 having a width equal to the thickness of the saw blade being used.
  • the upper edges of the guide slot 14 are defined by a pair of corner strips 32 which are also shown in more detail in Figure 2.
  • the two halves of the guide member 10 are each provided with two clamping bolts 16, arranged one at each end of the respective guide member half, the bolt 16 being intended to receive clamping nuts 18.
  • the second guide member 20 is made of two halves 20a and 20b which are separable from one another.
  • the first half 20a has holes 26 through which the clamping bolts pass during use, while the second clamping member half 22b has holes 28 which are elongated to form slots which allow lateral movement of the halves relative to one another after the bolts 16 have been passed through the holes 26, 28 but before the clamping nuts 18 have been secured.
  • the clamping nuts 18 have conical seats 40 (see Fig 2) which engage in countersink recesses 42 at the mouths of the holes 26, 28 to ensure alignment of the slot 24 in the upper guide member 20 with the slot 14 on the lower guide member 10 when the clamping nuts 18 are tightened.
  • L-shaped strips 32 of a plastics material are secured over the corners of the guide member halves 10a and 10b, 20a and 20b.
  • the corner strips 32 may be secured to the guide members 10, 20 in any suitable manner such as by adhesive, screws or interlocking engagement.
  • the surface of the corner inserts 32 facing the board 50 to be cut is not flush with the adjacent surface of the guide member so that when the clamping nuts are tightened on a board as shown in Figure 2, the edges of the inserts are firmly clamped against the board surfaces.
  • a rib or the like projection may be formed on the surface of the guide member halves to ensure that the cut remains perpendicular to the board.
  • the set screws 31, 30 pass through the upper and lower ends of the first guide member 10a nd screwed into the second guide member 110b.
  • Springs 35 are provided about the screws 31; 30 to urge the two halves apart when the screws are slackened. By adjusting these screws the separation of the two guide member halves, that is to say the width of the guide slot, may be varied.
  • the clamping nuts have heads 36 which are located in holes in the guide member 20.
  • a cross bore drilled through the guide member and the heads of the clamping bolts receives a pin 38 to prevent rotation of the clamping bolts when the clamping nuts are tightened.
  • the pin 38 also serves to align the two halves 10a and 10b.
  • the same pin 38 also carries a freely rotatable overrun roller 51 (see Fig. 3) located within the guide slot so that after the saw has completed the cut through the board it causes the roller to slip on the pin 38 and prevents accidental damage to the saw jig.
  • the surface of the roller 51 may be serrated to ensure that it rotates with movement of the saw and a click mechanism, similar to a rattle, may be driven by rotation of the same roller so that a clicking noise may indicate to the user that he has sawn through the entire width of the board.
  • the saw jig In order to use the saw jig, it is first set in the attitude shown in Figure 1.
  • the saw jig is intended to be used in the attitude illustrated, that is to say with the saw guide slot substantially vertical with the board leaning back at an angle preferably 70° to the horizontal.
  • the separation of the two guide member halves 10a and 10b at the upper and lower ends is set to match the width of the saw blade cut by altering the set screws 30, 31 as necessary.
  • the board 50 which is to be cut is next slid in position between the two guide members.
  • springs 37 arranged around the clamping bolts 16 urge the two guide members apart.
  • the heads 36 of the lower clamping bolts 16 in Figure 1 are formed with a semi-circular stop 39 projecting into the gap between the two guide members, the purpose of the stops 39 being to support the board and prevent it from resting on the springs 37.
  • the bolts of the first upper guide member half 20a are tightened to grip the board 50 loosely.
  • the clamping nuts of the second half 20b of the guide member have not been tightened, the latter half 20b may be moved slightly aside, on account of the slotted holes receiving the clamping bolts, to allow the user to see clearly that the first guide member half 20a is accurately aligned with a line of cut which has been previously scribed on the board.
  • edges of the slots are.in intimate contact with both the upper and lower surface of the board 50 so that the board 50 may cut either by means of a hand saw or by means of an electrical saw without the risk of the surface on the exit side of the saw blade chipping.
  • the horizontal disposition of the board offers the further advantages that less workspace is required and if the board is wide there is no need to lean in an uncomfortable position over the board while sawing and consequently the user of the jig need not suffer unnecessarily from fatigue.
  • the saw engages the roller 51 lying beneath the lower edge of the board and this roller will commence to turn but will not be damaged by the saw.
  • the roller may be arranged to make a sound as it rotates to warn that the cut is complete.
  • the corner strips 32 secured to the upper and the lower guide members are L-shaped plastics strips secured onto the body of the guide members.
  • the longer limb of the "L” is chamfered at the top to guide the saw into the slot without damage to the strips 32.
  • a plastics material such as PVC
  • PVC polyvinyl styrene
  • the corner strips may be of metal.
  • the corner strips need not be mounted directly on the guide members but a layer of foamed plastics material or a spring may be interposed to urge the strip resiliently in the direction of the board 50.
  • the guide member halves 60 are formed of an aluminium extrusion.
  • the extrusion is formed with a channel 62 which receives a bead 64 on the end of a limb 66 which
  • Th;e corner strip is extruded from a plastics material and in its free state will be spaced from the body of the guide member. As a result, the corner strip is urged resiliently against the board when the clamping nuts 18 are tightened to ensure intimate contact with the surface of the board.
  • parallel ribs may be formed on the guide member halves 20a, 20b to act as a guide for the sole plate of an electrical saw. It is ordinarily difficult to use a jig saw to cut a straight line but such ribs allow the jig to be used with most kinds of power saw.
  • the clamping action in the described embodiments is not as effective if the board is considerably narrower than the distance between the clamping bolts 16. This is because the guide members would need to be very stiff to withstand bending. This problem may be overcome by placing a piece of waste board between the guide members 10, 20 or by means of a washer around the upper clamping bolts. As a further alternative, several holes may be provided along the length of the guide members so that the separation of the clamping nuts may be altered to suit the width of the board being cut.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Claims (12)

1. Un chevalet de sciage pour la coupe d'un panneau, comprenant un élément (10) définissant une fente (14) pour une lame de scie, la fente ayant à peu près la même largeur que la lame de scie, et des moyens (16, 18) pour fixer l'élément (10) sur le côté de sortie de lame du panneau, les' angles de l'élément qui définissent la fente (14) étant maintenus en contact étroit avec la surface du panneau pendant l'utilisation, pour éviter une fragmentation, caractérisé en ce que l'élément (10) est composé de deux moitiés (10a, 10b) espacées l'une de l'autre par la fente (14), de sorte que la fente (14) peut recevoir la lame d'une scie à main et guider cette scie à main pour suivre la ligne de coupe désirée, et en ce que l'écartement entre les deux moitiés (10a, 10b) de l'élément de guidage est réglable de manière à permettre d'utiliser des lames de scies d'épaisseurs différentes.
2. Chevalet de sciage selon la revendication 1, dans lequel des éléments de guidage (10, 20) sont prévus à la fois sur le côté d'entrée de la lame de scie et sur le côté de sortie de la lame de scie, l'élément de guidage (20) situé sur le côté d'entrée comportant une fente (24) ayant à peu près la même largeur que la lame de scie, alignée sur la fente (14) de l'élément de guidage (10) du côté de sortie, et garantissant que la lame reste dans le plan désiré par rapport à la surface du panneau.
3. Un chevalet de sciage selon la revendication 1 ou 2, dans lequel chaque élément de guidage (10, 20) comporte des bandes d'angle amovibles (32).
4. Un chevalet de sciage selon la revendication 3, dans lequel les bandes d'angle amovibles (32) sont formées d'une matière plastique.
5. Un chevalet de sciage selon la revendication 3 ou 4, dans lequel les bandes d'angle (32) sont montées sur le corps de chaque élément de guidage (10, 20) de manière à faire saillie élastiquement au-delà de la surface du corps de l'élément de guidage.
6. Un chevalet de sciage selon la revendication 2 ou l'une des revendications qui en dépendent, dans lequel les moyens de fixation des éléments de guidage comprennent des boulons (16) fixées à un élément de guidage (10) èt traversant l'autre élément de guidage (20) et des écrous (18) pour serrer les éléments de guidage sur un panneau disposé entre les deux éléments de guidage.
7. Un chevalet de sciage selon la revendication 6, dans lequel les trous d'au moins une moitié d'élément de guidage (20b) sont allongés de manière à permettre un déplacement latéral des moitiés d'un élément de guidage l'une par rapport à l'autre avant le serrage des boulons de serrage.
8. Un chevalet de sciage selon la revendication 6 ou 7, dans lequel les écrous de serrage ont une portée conique et les trous de l'élément de guidage sont évasés à la fraise de manière à permettre un alignement automatique des éléments de guidage sur les deux faces du panneau à couper.
9. Un chevalet de sciage selon l'une des revendications précédentes, dans lequel un pied (12) est prévu pour supporter le chevalet avec le panneau à couper dans un plan incliné d'un angle faible sur la verticale.
10. Un chevalet de sciage selon la revendication 9, dans lequel le pied (12) a une forme générale en U et est articulé sur un élément de guidage (10), de sorte que le chevalet peut se replier à plat.
11. Un chevalet de sciage selon l'une des revendications précédentes, dans lequel chaque élément de guidage a la forme d'un profilé (60).
12. Un chevalet de sciage selon la revendication 11, dans lequel le profilé comprend une rainure (62) adjacente à l'un de ses angles, et une bande d'angle amovible est formé comme un deuxième profilé ayant un bourrelet (64) logé dans la rainure (62).
EP19830901932 1982-02-19 1983-02-18 Chevalet de sciage Expired EP0101734B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83901932T ATE21060T1 (de) 1982-02-19 1983-02-18 Saegefuehrung.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB8204873 1982-02-19
GB8204873 1982-02-19
GB8217650 1982-06-18
GB8217650 1982-06-18
GB8219583 1982-07-08
GB8219583 1982-07-08

Publications (2)

Publication Number Publication Date
EP0101734A1 EP0101734A1 (fr) 1984-03-07
EP0101734B1 true EP0101734B1 (fr) 1986-07-30

Family

ID=27261481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901932 Expired EP0101734B1 (fr) 1982-02-19 1983-02-18 Chevalet de sciage

Country Status (3)

Country Link
EP (1) EP0101734B1 (fr)
DE (1) DE3364819D1 (fr)
WO (1) WO1983002917A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015079253A1 (fr) * 2013-11-29 2015-06-04 Andrew Fitzmaurice Guide pour couper des dalles de pavage

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2127996C (fr) * 1992-01-14 1998-04-07 Gerhard Kalber Dispositif anti-fragmentation pour machines a scier
GB9205657D0 (en) * 1992-03-14 1992-04-29 Charlton Leigh A Safety cut
AU706189B3 (en) * 1999-02-19 1999-06-10 Moncreiff, Lois Tile profiling device
AUPP879099A0 (en) * 1999-02-19 1999-03-18 Moncrieff, William Tile profiling device
GB2358832A (en) * 2000-02-03 2001-08-08 Brendan Long Portable mitre clamp
US8950459B2 (en) 2009-04-16 2015-02-10 Suss Microtec Lithography Gmbh Debonding temporarily bonded semiconductor wafers
CA2832314C (fr) 2013-11-06 2014-07-29 Timothy G. Harlos Gabarit pour coupe transversale d'une piece a travailler allongee utilisant des elements de guidage a fentes separes sur les cotes opposes de celle-ci

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT255107B (de) * 1964-10-23 1967-06-26 Eisele Maschf Chr Werkstückspanneinrichtung für Sägemaschinen
US3403709A (en) * 1965-08-16 1968-10-01 Curtis A. Retherford Panel board power saw apparatus
US3389724A (en) * 1966-06-27 1968-06-25 Bryant M. Paul Saw guide
AT283704B (de) * 1966-07-09 1970-08-25 Gino Benuzzi Tischkreissäge
US3830130A (en) * 1971-01-21 1974-08-20 H Moore Guide for portable power saws
FR2248903A1 (en) * 1973-10-26 1975-05-23 Testas Etienne Saw cut guide for metal frame sections - is metal channel with grooves for section positioning and locking devices
DE2522750A1 (de) * 1975-05-22 1976-12-09 Scheer & Cie C F Saegemaschine zum durchtrennen plattenfoermiger werkstuecke
US4123846A (en) * 1977-05-03 1978-11-07 Manuel Parras Framing square guide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015079253A1 (fr) * 2013-11-29 2015-06-04 Andrew Fitzmaurice Guide pour couper des dalles de pavage
US9981354B2 (en) 2013-11-29 2018-05-29 Andrew Fitzmaurice Guide for cutting paving slabs

Also Published As

Publication number Publication date
DE3364819D1 (en) 1986-09-04
EP0101734A1 (fr) 1984-03-07
WO1983002917A1 (fr) 1983-09-01

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