US2905210A - Bench saw attachments for multiple angle cutting - Google Patents

Description

Sept. 22, 1959 D. THOMAS 2,905,210

BENCH SAW ATTACHMENTS FOR MULTIPLE ANGLE CUTTING 2 Sheets-Sheet 1 Filed Oct. 8, 1958 Sept. 22, 1959 D. THOMAS 2,905,210

BENCH SAW ATTACHMENTS FOR MULTIPLE ANGLE CUTTING Filed Oct. 8, 1958 2 Sheets-Sheet 2 4/ 3/ 3949 Egg BENCH SAW ATTACHMENTS FOR MULTIPLE ANGLE CUTTING Dimitri Thomas, Blue Island, Ill.

Application October 8, 1958, Serial No. 766,089

3 Claims. (Cl. 143-169) The present invention relates to bench saw attachments for multiple angle cutting, and is particularly concerned with attachments which are adapted to be used with any bench saw, having a table provided with a rectangular groove extending parallel to the rotary saw blade.

One of the objects of the invention is the provision of an improved compact and simple attachment for a bench saw by means of which pieces of lumber, such as molding, trim, picture framing, plywood, and other special pieces of lumber may be cut accurately at any angle so that the parts will fit together smoothly to provide a finished job in the making of door ornaments or pieces of inlay or cabinet work.

Another object of the invention is the provision of an improved attachment of the class described which is compact, simple, capable of economical manufacture, and adapted to be used in factory production for making a multiplicity of identical wooden parts with a minimum amount of time and labor.

Another object of the invention is the provision of an improved attachment of the class described which will fit any bench saw by merely adjusting the guide bar to conform to the distance between the guide groove on the saw table and the slot for the saw blade.

Another object of the invention is the provision of an improved attachment which may be used to cut at any degree to a high degree of accuracy, and which has a pair of guides that may be set at different or complementary angles to manufacture Wooden parts without changing the setting of the guides.

Another object of the invention is the provision of an attachment of the class described which has a maximum safety for the user, being provided with a guard that covers the saw blade at all times from both sides and the top so that the fingers of the user cannot come close to the saw blade or touch it, and which is provided with handles located on the plate and the guard for convenient manipulation.

Another object of the invention is the provision of an attachment of the class described which is limited in its sliding movement so that the metal parts can never come into contact with the saw blade to damage its teeth or sharpness.

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings, in which similar characters of reference indicate similar parts throughout the several views.

Referring to the drawings, of which there are two sheets,

Fig. 1 is a top plan View of the attachment embodying my invention;

Fig. '2 is a fragmentary front elevational view;

Fig. 3 (sheet 1) is a bottom plan view;

Fig. 4 is a sectional View on the plane of the line 44 of Fig. 1, looking in the direction of the arrows;

Fig. 5 is a fragmentary sectional view taken on the Patented Sept. 22, 1959 2 plane of the line 55 of Fig. 1, looking in the direction of the arrows;

Fig. 6 is a fragmentary sectional view taken on the plane of the line 66 of Fig. 1, looking in the direction of the arrows;

Fig. 7 is a fragmentary sectional view taken on the plane of the line 77 of Fig. 1, looking in the direction of the arrows;

Fig. 8 is a fragmentary sectional view taken on the plane of the line 88 of Fig. 1, looking in the direction of the arrows;

Fig. 9 is a fragmentary sectional view taken on the plane of the line 99 of Fig. 1, looking in the direction of the arrows;

Figs. 10-14 are plan views of various types of assemblies of ornamental moldings made, using the present attachment.

Referring to Figs. 1 and 2, 10 indicates in its entirety a conventional bench saw which is provided with a metal table 11, having an upper plane surface 12, which is provided with a rectangular groove 13 extending from front to back of the bench saw table 11 parallel to the rotary saw blade 14, which is mounted upon a shaft 15 to rotate in a slot 16 in the bench or table 11 and to have its upper edge 17 projecting above the bench saw table 11.

The present attachment preferably comprises a relatively thick plywood board 18, which is generally circular in shape, and which serves as a support for an aluminum plate 19 serving as a gauge plate for indicating the degrees setting for various cuts.

The diameter of the board 18 is preferably about sixteen to eighteen inches; and that of the gauge plate 19 is preferably larger so that the guage plate may have its outer edge 20 projecting beyond the edge 21 of the board to provide space for the clamping members 22, which are used to secure the guide rails 42 and 43 in any adjusted position.

The gauge plate 19 is fixedly secured to the table board 18 by a plurality of screw bolts having heads and nuts countersunk therein or by wood screws; and both the gauge plate 19 and the table board 18 are provided with a transversely extending saw blade slot 24 of sufl'icient width to pass any saw blade that is to be used, without contact.

The slots 24 in plate and board register with each other and are Wide enough to permit the use of relatively thick saw blades so that saw blades of different thickness may be employed.

In order to provide a still wider range of movement for the attachment, the board and plate may be provided with a forwardly extending integral radial extension 25, 26, into which the slot 24 extends; and this extension may have its end rounded to serve as a handle and may have an angle projecting upward to serve as a second handle 36A.

The bottom of the board 18 is provided with a guide bar 27, comprising a rectangular bar of brass, which fits in the slot 13 in the bench saw table and slides freely therein.

The guide bar 27 preferably has a laterally turned end 28 which is adapted to strike the rear edge of the bench saw table 11 to limit the forward movement of the at tachment so that the saw blade will never strike the end 29 of the slot 24.

A brass bar is preferably employed to avoid any possibility of the bar getting rusty and sticking in the groove 13.

The bar 27 is secured to the board 18 by a plurality of countersunk screw bolts or wood screws 29A, having both heads and nuts countersunk therein.

The table board 18 serves as a support to which the bar may be secured without any securing members being visible from the top of the gauge plate, which may be kept smooth and unobstructed.

The attachment is provided with a guard 30, comprising a top plate 31 and a pair of side plates 32,v 33 bent to conform to the shape of the top plate 31, which may be tapered at 34. The top plate 31 has a pair of securing bolts 35, which extend through it and are provided with cap nuts 36 and with spacing tubes 37, see Fig. 9.

The bolts 35 extend through the top plate and spacing tubes 37 and through apertures in the gauge plate and the table board 18, and are provided with countersunk nuts 38 below the table board 18, supporting the guard 30 at its rear end.

At its forward end the guard is supported by a pair of pivot bolts 39 and 40 having nuts clamping the top plate of the guard to the pivot bolts; and each pivot bolt has its side welded to a guide rail 41 or 42 at the end of the vertical flange 4-3 of each guide rail.

The bolts 39 and 40 extend downward through the gauge plate 19 and table board 18 and are provided with countersunk heads or nuts below the board 18. The bolts 39 and 40 extend normal to or at right angles to the plane of the top of the gauge plate 19.

The guide rails 41 and 42 comprise angle members which preferably extend beyond the edge 20 of the gauge plate 19 so that the end portions may serve as handles 43A. Each guide rail has a horizontal flange 4 i and a vertical flange 43 at right angles to each other; and the vertical flange 43 serves as the guiding surface against which workpieces are held while they rest on the gauge plate 19, which also has an upper plane surface.

Each guide rail is preferably tapered at the edge of its horizontal flange 44 inwardly to the bolt 39 or 40 so that the guide rails may come closer to the guard 36, permitting the setting at angles as small as five degrees or smaller.

The guide rails 41 and 42 may also be pivoted forward until the flat guide surfaces of the vertical flange 45 come into paralleiism with the slot 24 for angular settings down to zero.

Each guide rail 41 or 42 is provided with a clamping member 22 of substantially rectangular U-shape, see Figure 6. The yoke 46 of the clamping member 22. extends through an aperture 47 in the horizontal flange 43 of each rail; and the lower leg 48 of each clamping member is located below the outer edge of the gauge plate 19.

The upper leg 49 of each clamping member is located above the horizontal flange 43 of each guide rail and has a threaded aperture for a clamping screw bolt t which may have its head 51 provided with a transverse pin 52; and it may have its threaded shank 53 threaded in the bore 54 of the leg 49 and provided with a rotatable head 55 engaging the horizontal flange 43.

Thus the guide rails 41 and 42 pivot at their inner ends and may be clamped at their outer ends at any desired angular setting.

Each guide rail 41, 42 preferably has a sliding stop member 56, including a foot flange 57 that slides on the gauge plate 19, see Fig. 5. A right angle flange 58 has a stop and a U-shaped portion 59 that embraces the top edge of the vertical flange 45 and is clamped to the guide rail by a set screw 60.

The stop member 56 determines the length of the pieces which engage the vertical flange 53 and extend toward the saw blade.

The guard 31 may have an angle member 61 secured to its end with one flange projecting inwardly and serving as a handle.

The board 18 and the gauge plate 19 have circular 'e'dg'e's, but do not comprise a complete circle. Instead they are formed on two arcs, using the axis of the pivot bolts 39 and 40 as centers; and each arc describes slightly more than a half circle.

Each pivot bolt is slightly spaced from the edge of the slot, such as, for example, one-eighth of an inch; and a line drawn through the axis of each pivot bolt 39 and 40, parallel to the walls of the slot 24, is in each case a diameter of the left half and the right half of the gauge plate.

Adjacent its outer edge the gauge plate is provided with a circular are that is divided up into scale divisions, comprising radial marks separated by five degrees and by additional scale divisions indicating two degrees each.

By interpolating between these division marks, one degree may be accurately determined; and the guide rails may be set at any desired degree. As the scale markings are located at the outer edge of the gauge plate, a high degree of accuracy may be attained.

One of the most important uses of the present attachment is for the making of ornaments of molding for flush type doors.

Figs. 1014 are examples of the type of ornaments that may be manufactured by using the present attachment. The variations and shapes that may be manufactured with a minimum amount of time and labor are infinite; and the fit of the parts is exact, without divergence or grooves between the parts.

For making larger parts the guide rails may be provided with an extension 62, comprising an angle which has a groove 63 and a set screw 64 for clamping the extension 62 on either one or both of the guide rails, see Figs. 1, 2 and 4.

The method of operation of the present attachment will be apparent from the foregoing description.

The attachment is applied to the top .of the bench saw table, where it slides freely with the saw blade 14 in the slot 24.

The guide rails may be set at any desired angle; and the workpieces may be held against the vertical flange of the guide rail while the attachment is slid from the front toward the back or from the back toward the front with the saw blade cutting the workpiece at the desired angle.

It will thus be observed that I have invented a bench saw attachment which is adapted to saw moldings, picture frames, inlaid parts, and any pieces of lumber that may be laid on the gauge plate, at angles which are extremely accurate, so that the parts may be fitted together to make ornaments, frames, and the like.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

l. A bench saw attachment, adapted to be readily mounted or dismounted on a saw table, having a rotating blade projecting upwardly through a slot, and having a rectangular guide groove extending from front to back of said table, parallel to said blade, comprising a near circular plywood table top of maximum diameter with relation to the size of the table, and having a non-rusting non-ferrous guide bar fitting in said guide groove and secured to the bottom of said table top, to be placed in said guide groove for free sliding movement of the table top, said table top having a thin sheet metal gauge plate secured to the upper side of the table top, and provided with arcuate degree indicia and scale divisions over 360 degrees of arcuate edge, said table top and gauge plate both having registering through slots, closed at each end, and parallel to and receiving the saw blade, and extending from points adjacent the edge at the front and back, said table top and gauge plate comprising integral members formed with arcuate edges of slightly more than degrees each on a pair of axes located adjacent the through slot but spaced from each other and located on opposite sides of the through slot, a guard carried by the table top and the gauge plate over the rear part of the through slot, and comprising a guard top plate and a pair of guard side plates enclosing said blade, said guard being secured to the table top by through bolts located in said axes, binding the top guard plate and side plates to the gauge plate, and passing through the ends of a pair of guide rails of angular shape, outside the guard, each guide rail having a vertical flange, the front of which registers with an angular gauge setting at the outer edge of the gauge plate for providing maximum angular accuracy, and means for securing both guide rails in adjusted position.

2. A bench saw attachment according to claim 1, in which the securing means comprises a C shaped screw clamp passing through an aperture in the guide rail angle flange in each case and open inwardly toward the axes so that the screw clamp may engage over and clamp the arcuate edge of the gauge plate which extends beyond the table top.

3. A bench saw attachment according to claim 2, in which the guide bar is provided at its rear end with a laterally turned portion acting as a stop in limiting the forward motion of the table top and the table top has a forward handle extension containing the end of the through slot, and providing means for the user to grasp said extension to move the table top.

References Cited in the file of this patent UNITED STATES PATENTS 2,237,556 Hedgpeth Apr. 8, 1941 2,606,580 Johnson Aug. 12, 1952 2,667,190 Delano Jan. 26, 1954 2,680,458 Grammar June 8, 1954 2,696,854 Woodrufi Dec. 14, 1954 FOREIGN PATENTS 83,727 Switzerland May 17, 1920

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