DE3434469A1 - Workpiece fixture for electric saw - Google Patents

Abstract

A saw accessory for enabling any desired angle of crosscut to be effected in a workpiece (10) by an electric saw of the kind comprising a saw blade which projects through a slot in a sole plate (2), the accessory comprising a first member (5) which can be rested against an edge or surface of the workpiece, and an elongate second member (6) which is arranged to be angularly adjustable realtive to the first member and adapted to be placed on and extend across the upper, working surface (10a) of the workpiece to provide a lateral support for the sole plate of the electric saw during sawing, characterised in that said second member is of such a length relative to the length of the intended crosscut that it provides a sliding surface (6b) on which the sole plate of the electric saw can be placed prior to sawing, moved during sawing and supported after sawing, in that the sliding surface of the second member has slide means (8) associated therewith - to provide said lateral support, against which the rear edge of the sole plateengages and is guided thereby during sawing, and in that an elongate third member (9) is connected to the second member, which in use is pressed directly against said upper surface (10a) of the workpiece by the user so as to hold the first and second members in place against the said workpiece, said third member extending in the same direction as the second member and being spaced beyond the adjacent edge of its sliding surface so that the sawblade of the electric saw cannot combe into contact with the relevant hand (11a) or other limb part of the user during sawing

Description

The invention relates to a saw template for making angle cuts with an electric Hand saw, the saw tool insert from the underside of its base plate, which is used for guidance on the workpiece protrudes. The workpiece can be a board, a beam, a bar, a board or the like.

Saw templates for electric hand saws are already known. However, they are often quite cumbersome and difficult to handle. The invention is based on the object of providing a saw template of the type mentioned at the beginning to create a safe guidance of the electric saw that can be quickly and easily adjusted on the workpiece during its use and facilitates the execution of a smooth and precise cut.

This object is achieved according to the invention in that the angle arm serving as a lateral guide acts as a supporting one Base is designed with a sliding surface for the electric hand saw and at the same time carries a guide bar, that the same angle arm is connected to a holder that the user to hold the two angle arms on the workpiece with part of its body, e.g. a hand, knee or foot, against the top of the Workpiece can be pressed, and that the holder laterally from the sliding surface of the serving as a side guide Angle arm is arranged so that the saw during use does not touch the template on the workpiece gripping body part of the user can come into contact.

Possibilities for an advantageous further embodiment of the invention are given in claims 2 to 10.

For example, the new Template made much easier. The sawing can take place directly at the place of use of the workpieces or also at a pile of boards in the workshop. It is also a processing of such a stack with the saw over possible beyond the edge of the workpiece. With the new template, smooth and precise saw cuts can be made at angles run from 0 to 90 °.

While the saw blade of the electric saw is working on the workpiece, the template ensures that the saw is guided precisely both vertically and laterally. This will start the sawing process relieved. It is used in such a way that the electric saw gently against the side guide bar is pressed and moved over the sliding surface of the template, which preferably consists of a sliding-promoting Material consists or is coated with such a material. In addition, the sliding surface preferably has Such a length that the electric saw is still supported by it even after the saw cut has been completed and this makes it easier to remove the saw from the material of the workpiece. The sawing process can can basically be performed with one hand while

the stencil is simultaneously held in its position of use with the other hand. If necessary, can Both hands can also be used to guide the electric hand saw, for example in the initial phase a sawing process, while the template with a knee, a foot, an elbow or the like. Of the same Person is being held. While the saw blade rotates, the workpiece and the part of the template that carries the sliding surface, pressed tightly against each other, so that no play between this part of the template and the workpiece is present. This creates the prerequisites for trouble-free passage of the saw blade and smooth sliding of the electric saw on the sliding surface is guaranteed. As the electric saw lengthways the sliding surface works against this, are the prerequisites for a straight, smooth saw cut over the whole Saw or cut surface fulfilled.

If desired, the side guides that shape the a rail or ledge can be made adjustable so that they are suitable for all possible widths electric hand saws and the best possible support function for the footplate of the electric Handsaw results.

The new saw template does not require any changes to the electric hand saw itself.

The invention is explained in more detail below with reference to the drawings. This relates to an embodiment of a saw template according to the invention. Show it

Fig. 1 is a perspective view of a Saw template according to the invention in its position of use on a workpiece in the form of a board in connection with an electric hand saw guided on it, FIG. 2 is a plan view of the saw template according to the invention,

Fig. 3 is a sectional view looking in the direction on a sectional plane perpendicular to the guide strip and FIG. 4 shows a sectional view with a viewing direction on the section plane IV-IV of FIG. 2.

The saw 1 shown in Fig. 1 is an electric one Hand saw of the usual type with footplate 2 and circular saw blade 3, which protrudes downward from the footplate. The saw template 4 consists essentially of two angle arms 5, 6. The one angle arm 5 can be attached to a straight edge or surface of the workpiece 10 can be created. The other angle arm 6 has essentially the shape a thin rectangular plate with a thickness of 2 to 6 mm. The angle between the two angle arms 5, 6 is adjustable. For setting a manually operable setting device 7 is provided which has a has unlocked and a locked position. In the unlocked position, the arm 5 is opposite the Arm 6 rotatable, in the locked position the angle between the two arms is fixed unchangeably.

The plate-shaped arm 6 is preferably made of metal, for example aluminum. It has a projection 6a in Shape of a segment of a circle, one attached to it

or has an embossed scale showing the angle between arms 5 and 6.

The angle arm 6 is designed as a sliding surface 6b on its upper side. He also wears a side Support or slide 8 along which the electric hand saw can be guided, the underside of whose underside 2 on the sliding surface 6b and the side edge surface of the footplate on the side surface 8b of the Slide rail 8 can be pushed along.

On the angle arm 6 is a holder 9 in the form of a handle, here in the form of a hollow cylindrical rod, attached, which extends at a distance from and parallel to the angle arm 6. The angle arm 5 carries one on the workpiece 10 overlapping part 5a, the underside of which can rest on the workpiece surface 10a. The template can be placed on the workpiece 10 so that the underside of the angle arm 6 on the workpiece surface 10a rests, while at the same time the bottom of the protruding part 5a and the bottom or a lower edge of the holder 9 rests on the workpiece surface 10a. The template is indicated by the one indicated at 11 User pushed down and forward. The direction of printing is indicated by the arrow F.

The holder 9 is provided with a friction-enhancing coating or profiling in the form of ribs, grooves or the like, which prevent mutual sliding between the template and the workpiece, while the template is brought into its correct position and the sawing process begins.

343U69

The sawing process goes in such a way that the template by the user with one hand 11a by means of Holder 9 held in place on the workpiece 10 and with the other hand the electric hand saw 1 is guided in such a way that the footplate 2 is moved along on the sliding surface 6b, at the same time the footplate of the saw is gently pressed against the surface 8b of the slide rail 8. The length of the angle arm 6 and the sliding surface 6b is preferably larger than the width of the workpiece, so that the guide of the electric hand saw with regard to their height and lateral position before the start and also after the end of the saw cut.

The slide rail 8 is in the exemplary embodiment shown here laterally adjustable so that the width of the sliding surface is adapted to the width of the footplate of the hand saw can be. This means that the saw blade 3 work close to the edge of the sliding surface regardless of the type of hand saw can and the safety shield of the saw can interact with the sliding surface, whereby the start of the sawing process is facilitated. However, the slide rail can also be arranged in a fixed manner and made of a profiled component consist of rectangular or polygonal cross-section of the angle arm 6. The slide rail is preferred attached to the angle arm 6 so that it is stiffened by them. The angle arm 6 and the holder can to be integrated into a combined component which has a bent piece on one of its long sides, so that formed a unit to be held with one hand

will. In this case the angle arm should be provided with through holes for the adjustment device 7 and enable a view of the workpiece below.

It is important that the holder is arranged at a distance from the side of the sliding surface 6b so that the hand 11a or another part of the body such as the user's foot or knee is not in contact with the rotating circular saw blade can occur when the latter is moved along the sliding surface during sawing.

The pivot bearing required for the angle arm 5 on the angle arm 6 is shown in FIG. 2 with the reference number 12 designated. This pivot bearing can in a known manner from a retaining screw penetrating the angle arm 6 12a and a disk 12b on the underside of the arm and a retaining disk 12c on the top. The disk 12c on the upper side is sunk so that it lies below the sliding surface plane 6b. the Washer 12c is mounted on screw or pin 12a to provide a reliable pivot bearing for the angle arm 5 is formed on the angle arm 6. According to Fig. The angle arm 5 consists of an angle profile whose Leg 5b rests with a wider side surface on that part of the workpiece which the user is on next lies.

The manually operated adjusting device 7 contains a lower and an upper locking disc 13 or The upper disk is fastened with the aid of a set screw 15 and two balls 16, 17. The adjusting screw

sets a hole in the arm 5 and holds the washers 14 and 14 together with the arm 5 therebetween. the Balls 16 and 17 engage in recesses in the bottom of the disk 13 and the top of the arm 5. the The adjusting screw and the balls are located at the rear of the discs.

At the front ends of the discs there is a locking device, preferably in the form of a locking screw 18 (Fig. 3) and a locking nut 19. The locking screw goes through a hole in the arm 5 and the Lock washers extend over their front parts 13a and 14a on the angle arm 6. If the wing nut trained lock nut 19 is tightened, the front parts of the washers 13 and 14 on the angle arm 6 clamped so that a reliable locking is obtained. The disc 13 is through the balls in held essentially parallel to the arm 6. The construction shown enables a satisfactory Adjustment and locking for the angle arm 5 in relation to the angle arm 6.

The angle arm 6 has a rectangular horizontal plane (Fig. 2). It has protruding fasteners 6c and 6d which are located near both ends thereof. The holder 9 can take the form have a circular rod or tube, the surface of which bear against the workpiece 10 and in the area of Contact surface can be widened to increase the friction between the holder and the workpiece. The rod-shaped one Holder is at its ends with the help of arms 9a

and 9b attached to the projections 6c and 6d of the angle arm 6. The arms can be made of strip-shaped parts exist, which can be bent back around the ends of the rod-shaped part 9 and on itself.

They can be attached to the angle arm 6 with rivets, screws 20 or similar fasteners. The fastening projections 6c and 6d leave a sufficiently wide space between the holder 9 and him adjacent edge of the angle arm 6 free. This space allows convenient access for the user's hand and makes it easier to hold the template with one hand on the workpiece.

The distance A between the longitudinal axis of the holder 9 and the side edge surface 8b of the slide rail can be used 120 and 200 mm and preferably about 160 mm. The width B is preferably about 200 mm and the length in the embodiment is about 1 m.

The fastening arms 9a and 9b are designed so that a lower edge or surface 9c is flush with the upper side of the workpiece 10a lies when the underside 6a of the angle arm 6 rests on the workpiece surface 10a. It It is important that the part of the holder that interacts with the top of the workpiece rests on this when the bottom 6e of the angle arm 6 is parallel to the workpiece top 10a and rests on this.

The scale on the protruding part 6a of the angle arm 6 acts with a vernier scale attached to the disk 13 together. In the presence of the graduation of the

Nonius scale only everyone needs the scale on part 6a display the fifth graduation to ensure that the setting is still accurate enough for one at a time To allow angular degrees. The display of only every fifth degree of angle has advantages, since the embossed degree lines are denser would require a thicker material for the angle arm 6. The one shown in FIG. 2 on the angle arm 6 Graduation has the zero point in the middle of the scale graduation and 45 graduation degrees on both sides there. But the graduation could of course also start with 90 ° in the middle and gradually up to each 45 ° decrease on both sides.

The slide rail 8 can be adjusted to the side in the embodiment and the various Lateral adjustment options after the outer edge of the angle arm 6 are through rows of holes with a spacing of approximately 240 mm in the longitudinal direction of the angle arm 6 is achieved. The number of holes in the corresponding The row of holes depends on the overall dimensions of the Side shift to be provided and how many widths of base plates of electric saws in Should be considered. The slide rail is attached to the angle arm 6 with retaining screws and associated Retaining nuts or other locking devices of a known type releasably attached. You can also use two or more rows of holes 22 locking balls 23 are provided in pairs; these give the relatively long Angle arm 6 provides the stiffening that is required to connect it to the slide rail 8.

The possibilities for using and carrying out the invention are not limited to what is described here and illustrated embodiment. For example, the sliding surface 6b can be coated with plastic material, such as a plastic strip that is glued or otherwise attached to the rectangular plate 6 to ensure a permanent smooth surface. The angle lever 6, which is used for guidance be provided on its underside or on parts of it with friction-enhancing material, e.g. with a material that has the inclination on the workpiece surface to cling to. The basic idea is that the template 4 should be as easy to use as possible should and that it should allow it to be held with only one hand while sawing. The slide rail 8 can consist of the same material as the rest of the angle arm 6, for example by from this a strip folded over and applied in a punching machine to form a guide bar the angle arm is deformed. The template can in principle also consist of glass fiber reinforced plastic, the angle arms 5 and 6 being produced in a plastic molding press.

Claims (10)

DIPL.-ING. J. JUDGE. PATENTANVVLALJg DIPL.-ING. F. WERDERMANN O 4 O 4 4 D 3 REINS. REPRESENTATIVE AT THE EPO ■ PROFESSIONAL REPRESENTATIVES BEFORE EPO · MANDATAIRES AGREES PRES L1OEB 2OOO HAMBURG 36 Sept. 19, NEW WALL 1O 'S- (O 4O) 34 OO 45/34 OO 56 TELEGRAMS: INVENTIUS HAMBUR6 TELEX 2163 FILE L. 84 3 32 Wdm / Wa APPLICANT: Ο1ο £ Birger Larsson, Jägarvägen 7, S-69154 Karlskoga / Sweden DESCRIPTION: Saw template for an electric hand saw. Claims 1. Saw template for making angle cuts with an electric hand saw, its saw tool insert protrudes from the underside of their base plate serving for guidance on the workpiece, with two angle arms, one of which one of them rest against a straight edge or surface of the workpiece and the other against the former adjustable in angle, placed on top of the work piece and used as a side guide during sawing can serve for the electric hand saw, characterized in that that the angle arm (6) serving as a lateral guide serves as a supporting base with a sliding surface (6b) for the electrical manual saw (1) is formed and at the same time carries a guide bar (8), that the same angle arm (6) is connected to a holder (9), which is used by the user (11) to hold the two angle arms (5, 6) on the workpiece (10) with part of his body, e.g. a hand, a knee or a foot, can be pressed against the top (10a) of the workpiece, and
that the holder (9) is arranged to the side of the sliding surface (6b) of the angle arm (6) serving as a side guide, so that the saw does not get in the way of the part of the user's body holding the template (4) on the workpiece (10) during use Contact can come. 2. Saw template according to claim 1, characterized in that the on a straight edge or surface of the workpiece (10) angled arm (5) to be applied to the straight part closest to the user (11) during sawing of the workpiece (10) is used. 3. Saw template according to claim 1 or 2, characterized in that the holder (9) and / or one in use the saw with the workpiece top (10a) coming into contact with the part of it with friction-enhancing Material coated and / or with a corrugation, grooving or the like. Is provided. ² 343U69 4. Saw template according to one of claims 1 to 3, characterized in that the side guide forming the Angle arm (6) carries a guide bar (8). 5. Saw template according to claim 4, characterized in that the guide bar (8) on the angle arm (6) is adjustable in several positions parallel to itself. 6. Saw template according to one of the preceding claims, characterized in that the guide bar (8) and the sliding surface (6b) is provided with extensions opposite the saw cut, so that the electric hand saw guided both during the sawing and before the start and after the end of the cut in vertical and lateral position will. 7. Saw template according to one of the preceding claims, characterized in that the holder (9) itself extends parallel to the angle arm (6) serving as a lateral guide and its underside in at least approximately is the same height as the underside (6e) of this angle arm (6). 8. Saw template according to one of the preceding claims, characterized in that the to the workpiece Fixed angle arm (5) in a horizontal plane opposite the angle arm serving as a lateral guide (6) arranged pivotably and its pivot angle on a scale on a circular segment (6a) on the angle arm 3434A69 (6) can be read, and that an adjustable setting device (7) is attached next to the scale. 9. Saw template according to one of the preceding claims, characterized in that the side guide serving angle arm (6) is designed essentially as a rectangular plate, which has protruding parts, as a scale carrier (6a) and as a carrier (6c, 6d) for the holder (9) or mounting arms (9a, 9b) serve this. 10. Saw template according to claim 8 or 9, characterized in that the adjusting device (7) clamping disks, Has locking balls, an adjusting screw and a retaining screw, which the angle arm to be placed on the workpiece (5) allow to set in a certain angular position with respect to the angle arm serving as a lateral guide «and that the top disc (13) has a vernier scale on its top (13a).