US2344426A - Bevel method sawing - Google Patents

Description

March 14, 1944. E. P. STAMM BEVEL METHOD SAWING 2 Sheets-Sheet 1 Filed Jaln. 12, 1942 March 14, 1944. E P, TAMM 2,344,426

BEVEL METHOD SAWING Filed Jan; 12, 1942 2 Sheets-Sheet 2 Patented Mar. 14, 1944 UNITED STATES PATENT OFFICE BEVEL METHOD SAWING Edward P. Stamm, Portland, Oreg. Application January 12, 1942, Serial No. 426,501

2 Claims.

This invention relates to an improved method of sawing logs into lumber.

An object of this invention is to provide an improved means whereby both rectangular and bevelled lumber may be cut from a log with a minimum amount of waste and a minimum amount of handling of the log and the lumber.

Another object of this invention is to provide an improved method of cutting logs, which is designed particularly for cutting logs so that the grain in the lumber is substantially perpendicular to the opposite faces thereof.

A further object of this invention is to provide an improved method of sawing or cutting logs into lumber which will permit the cutting of the lumber in such a manner that the knots will extend substantially lengthwise of the opposite faces of the boards instead of at a more nearly perpendicular position with respect to the faces of the boards.

A further object of this invention is to provide an improved method of sawing and handling lumber which will permit a small mill using light equipment to cut the logs into the desired boards without the use of expensive equipment.

A further object of this invention is to provide an improved method of radially cutting a log into lumber so as to provide bevelled or tapered side strips with the grain of each strip substantially perpendicular to the opposite faces of the board.

A further object of this invention is to provide an improved method of cutting boards from logs whereby a greater number of boards will have the grain substantially perpendicular to the faces of the boards than is at present the case, and in carrying out this method, the perpendicular or vertical grain is obtained without wastage except for the waste caused by the saw blade moving through the lumber.

To the foregoing objects and others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of-parts as will be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations and modifications may be resorted to. which fall within the scope of the invention as claimed.

In the drawings: M

Figure 1 is a detail end elevation of a log showing the manner of cutting the log according to the present method,

Figure 2 is an end elevation of a log showing the method of cutting the log into rectangular lumber under the practice heretofore obtaining, FigureB is an end elevation of a log showing diagrammatically the positions of the knots in the log, and the manner in which these knots are cut so as to position them lengthwise of the opposite faces of the boards,

Figure 4 is a detail end elevation of a log mounted on a radial sawing apparatus whereby bevelled boards may be cut therefrom, and

Figure 5 is an end elevation showing the manner of cutting thetriangular heart section from the log Referring to the drawing the numeral l0 designates generally a log which is shown in end elevation. When the log I 0 is initially brought into the mill for cutting into boards, this log I!) is cut first into two half sections, and then each half section is cut into quarters I I, l2, l3, and I4. Where it is desired to out only one board of suitable thickness from a quarter section, such as section II, the quarter section is mounted on the saw carriage with one face thereof confronting the saw which is preferably a band saw, and a vertical cut I5 is made through the log section I l. The remaining sector shaped section is then mounted and supported on the saw carriage so that a triangular board I6 is cut through the right angular faces of the log. This provides a truncated sector shaped log body I! as shown in Figure 4. p

The truncated sector shaped section II shown in Figure 4 is then mounted on a radial log supporting device l8. The log section I1 is mounted on the radial sawing device I8 with one fiat face l9 thereof resting on the upper side of the sawing device l8 and the other fiat or right angularly disposed face 20 disposed in a substantially vertical position and at a point forwardly of the axial center 2] of the radial sawing apparatus.

The radial apparatus I8 is then progressively raised, and the saw carriage moved lengthwise past the saw in order to cut Wedge shaped or bevelled boards 22, shown in Figure 1. The radial log supporting apparatus I8 is progressively raised to bring successive portions of the log section I! into cutting position until a final board 23 remains on the radialv sawing. device l8. This final board is of such thickness as to prevent the saw blade from coming in contact with the log clamping hooks 24 and 25 which are a part of the radial sawing device I8.

The log Ill may also have another section thereof cut as shown by section I2 in Fi ure 1 wherein three boards 26, 2'], and 28 are initially cut from the quartered l g; and then the remaining sector shaped section has a triangular heart section 29 cut therefrom so as to form a truncated sector shaped section 30. This truncated sector shaped section 30 is then mounted on the radial sawing device l8, and successive cuts are formed in the sector shaped section 30 in the same manner as with the section l1.

Where an additional number of relatively wide boards are to be cut from the quartered section as shown by the quartered section l3, three vertical cuts 3| and 32 and 33 may be made through the quartered section, thereby forming three boards 34, 35, and 36. The opposite face of the reduced section l3 may also have two cuts 31 and 38 made therein parallel with the adjacent flat face of the initially quartered section therebyforming fiat or rectangular boards 39 and. The remaining sector shaped section is then shifted on the saw carriage so. as to permit the cutting of the heart section 4| from the remaining section. means of a cut 42, which is made at an angle to the adjacent faces of the reduced section after the cuts 33 and 38 have been made therein. The triangular heart sections it, and 4| are cut off for three reasons: first, to provide operating space for the log clamping hook 25. It may easily be seen that this purpose may also be served by chopping or otherwise cutting a notch in the heart corner of the log section at the point where the clamping hooks will engage or end clamping may be used; second, to

save the lumber contained in these heart sec-- tions, which has a value, and which would be cut up into sawdust if left attached to the remaining log section; third,.to lessen the amount of wood through which the saw must cut in sawing the bevel boards, thus reducing the work of the saw and consequently the amount of power required.

' The cutting off of varying numbers and thicknesses of vertical grain boards 26, 21, 28, 34, 35, 35, 39 and 40 is explained to show how any size log section may be made to fit the requirements for the sawing of any width bevel boards without loss or waste of timber and always securing an all vertical grain product.

In Figure 2 there is shown the conventional method hereinbefore used in the cutting of a comparatively large log. In this method the log is initially cut as indicated at thereby removing a small slab 45. The log is then formed with another cut 46 removing a fairly thick slab 41 from which a rectangular board or plank 48 may be cut. The log is then formed with a further vertical cut 49 forming a relatively thick slab or board 50 which is subsequently cut as indicated by the lines 5! to form narrow boards.

After the cut 49 is made in the log, the log is turned at substantially right angles'and a cut '52 is made in the log anda narrow slab 53 removed therefrom. A" second cut 54 is made parallel to the cut 52 thereby removing a slab 55 from which a rectangular board or plank 56 may be out. A further out 51 is made in the log removing a plank 58 having parallel opposite faces and rounded edges. The plank 58 may then be out along the lines 59 ina further sawing operation as to provide narrow boards or planks. An additional cut 60 is then made in the log parallel with the cut 51 removing a further fairly thick plank 6| which may be cut as along the lines 52 so as to form narrow boards of desired thicknesses. After the board or slab Bl has been cut The heart section 4! iscut by a cut 63 being made in the log thereby removing a narrow slab 64.

A cut 65 is then made in the log parallel with the cut 63 removing a slab 66, and a rectangular board or plank 61 may then be cut from the slab'66. A further cut 68 parallel with the cut 65 is made in the log, removing a slab or plank G9 which may then be out along the lines 10 so as to provide narrow planks or boards. A further out H is made in the log parallel with the cut 68 thereby removing a plank or slab 12 which is adapted to be out along the lines 13 so as to form narrow boards or planks.

. The remaining portion of the log is then turned through a further arc of 90 degrees, and a cut 14 is made in the outer side of the log moving a slab section 15. Another cut 16 is made in the reduced log which isparallel with the cut 14 and which forms a fairly thin plank or board 11 from which a rectangular board or plank I8 may be formed. A further out 19 is made through the log removing a slab or plank section which is adapted to be out along the lines 8| to form boards or planks of desired width and thickness. A further out 82 is then made in the remaining portion of the log, thereby removing a rectangular plank 83 which may be out along the lines 84 to provide planks or boards of desired width and thickness.

The remaining portion of the log wil1 be substantially rectangular in transverse section, and this remaining portion may then be cut through the center as indicated by the line 85 and the two halves of the remaining block or plank may then be cut along the lines 85 and 81 to provide planks or boards of the desired width and thickness.

It will be noted from Figure 2 that the log therein shown is formed with a plurality of radially arranged or extending knots 88 which extend radially about the center 89 and that these knots 88 extend angularly with respect to the boards rather than substantially parallel with the opposite faces thereof.

It will be noted from the conventional method shown in Figure 2 that only a very small number of boards cut from th log have the grain substantially perpendicular to the opposite faces thereof. This procedure forms boards which are not desirable for certain purposes, particularly from the log, the log is again turned through an arc of'90 degrees and moved past the saw'with outer surfaces, and in a single log a considerable number of the boards cut therefrom are undesirable and will not meet building specifications calling for the grain of the lumber being disposed within a range of 25 degrees of the vertical.

In Figure 3 there is disclosed th new method of cutting a log which may have considerable knots 90 therein. The log 9| is initially quartered as shown in Figure 1 so as to provide quarter sections 92, 03, 94 and 95. The quarter sections may then be cut parallel with one fiat face thereof as by a cut 96 to form a fiat board 91. The remaining sector shaped log section is then out along an angular cut 98 so as to remove the heart section 09 therefrom. The remaining lo'g section I00 is of truncated sector shape and is mounted on the radial sawing apparatus 18, where the radial cuts l0l may be made through the sector shaped section I00 to form a plurality of wedge shaped or bevelled boards I02. 1

It will be noted that when the bevelled boards I02 are cut from the sector shaped log I00, the knots 90 extend lengthwise or substantially parallel with the opposite faces thereof rather than extending substantially perpendicular to the oppo-site faces thereof, as the knots 88 in the conventional sawing method illustrated in Figure 2.

The hereinbefore described method of sawing or cutting a log provides not only radial cutting of the log, but also combines the radial cutting with the vertical or rectangular cutting of the log so that all of the boards cut from the log will be vertical grain and also a more nearly perpendicular or true vertical grain than is possible by the method heretofore used.

This radial cutting method also makes possible the building up of laminated timbers of any size which will have a true vertical grain throughout. This is done by gluing the desired number of boards together one on top of another, so that their thick and thin edges are alternately turned opposite.

The degree of bevel of the boards is changed by shifting the position in which the log section is held on the bevel sawing device. The changing of this position increases or decreases the radius of the circular arc in which the log section is moved as sawing progresses and consequently changes the degree of beve1 of the faces of the boards.

What I claim is: V

l. A method of cutting rectangular and beveled lumber from a quartered 10g having a pair of right angular flat faces which includes initially positioning the log with one flat face thereof horizontal and the other fiat face thereof vertical and adjacent the saw, making at least one vertical cut parallel with said vertical face to thereby form rectangular lumber, rotating the log to position the heart portion thereof innermost with respect to the saw and with the remaining right angular faces disposed at an obtuse angle to the vertical, cutting a triangular heart portion, again shifting the truncated quartered log to position one of the remaining right angular fiat faces horizontal and the other of the right angular faces vertical with the axial center of the log grain closely adjacent the cutting line, and finally making a series of cuts from the periphery of the log toward the obtuse face formed by removal of the heart section with the log rocked toward the saw after each cut to thereby form beveled boards, each beveled board having the configuration of a truncated V in section.

2. A method of cutting rectangular and beveled lumber having the grain thereof substantially perpendicular to the opposite fiat faces thereof from a quartered log provided with a pair of right angular faces which includes initially making at least one cut parallel with each fiat face, cutting the log at an obtuse angle to said pair of flat faces to thereby remove a triangular heart portion and form a third fiat face, and finally making a series of cuts from the periphery of the log toward the obtuse face formed by removal of the heart section substantially radically of the annular rings through the remaining log to thereby form beveled boards having the configuration of a truncated v in section.

EDWARD P. STAMNE.

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