US1802069A - Machine for treating wood to produce a weathered or antique appearance - Google Patents

Description

April 21, 1931- E. SCHMIVD 1,802,069

MACHINE FOR TREATING WOOD TO PRODUCE A WEATHERED OR ANTIQUE APPEARANCE Filed Oct. 24. 1929 5 Sheets-Sheet 1 INVENTOR. EM/L SCHM/D,

A TTORNE Y.

Apnl 21, 1931. E. SCHMID- 1,802,069

MACHINE FOR TREATING WOOD T0 PRODUCE A WEATHERED OH ANTIQUE APPEARANCE Filed Oct. 24. 1929 5 Sheets-Sheet- 2 INVENTOR. v IM/L S HM/ BY v A TTORNEY.

April 21, 1931. E sc MACHINE FOR TREATING WOOD TO PRODUCE A WEATHERED OR ANTIQUE APPEARANCE Filed Oct. 24. 1929 5 Sheets-Sheet [.VVENTOR. EM/L ScHM/D, BY 6% WW ATTORNEY.

p 21, 1931. E. SCHMID 1,802,069

MACHINE FOR- TREATING WOOD TO PRODUCE A WEATHERED OR ANTIQUE APPEARANCE Filed Oct. 24. 1929 5 Sheets-Sheet 4 39 INVENTOR.

EM/L SCH/W0,

ATTORNEY.-

E. SCHMID 1,802,069

MACHINE FOR TREATING WOOD TO PRODUCE A WEATHERED OR ANTIQUE APPEARANCE Filed Oct. 24. 1929 5 Sheets-Sheet 5 April 21, 1931.

[.Vl "EN TOR. ZM/L 5CHM/D, [6 /6 BY ITTORNEY.

Patented Apr. 21, 1931 UNITED STATES PATENT OFFICE EMIL SCHMID, OF WASHINGTON, DISTRICT OF COLUMBIA MACHINE roRTEEArINe woon T PRODUCE A WEATHERED on ANTIQUE PPEARANCE I Original application filed November 28, 1928, Serial No. 322,386. Divided and this application filed October '24, 1929. Serial No, 402,222.

The present invention relates to a machine for treating wood, to produce a weathered'or antique appearance.

' It is old to produce a weathered or antique g, appearance upon lumber by burning or charring the surface of the same and then removing the charred portion by means of a brush. This method has heretofore been practiced by hand, and consists in supporting a board or the like in a horizontal position with the surfaceto be treated arranged uppermost. A torch or burner providing a flame is then shifted over the upper horizontal surface of the board and the. Home is played upon the board. "After the surface has been burned or charred, the charred portion is brushed by hand to remove the same. This operation is I slow and expensive and the treatment of wood by this method has not gone into extensive use. Further, by the practiceof the method,

as explained, the board is arranged horizontally and only one side burned or charred. Due to the action of heat upon one side only of the board, the board will invariably Warp A transversely. To straighten the board, it is necessary to subse uently burn or char the opposite face of the board, audit is frequently difficult, if not impossible, to subject both faces of the board to the same degree of heat o whereby the board will again become perfectly fiat.

In accordance with my invention, I pro vide a method which is continuous, and a machine whereby the continuous method may be successfully practiced. The.b oard or the like to be treated is supported and preferably held on edge so that its opposite faces are substantially vertical. The holding and supporting means also tend to prevent the so board from warping transversely. As the opposite faces of the board are vertical, 1 am able to simultaneously apply substantially the'same degree of heat to the opposite faces, and hence the tendency of the board to transversely warpis entirely eliminated, and tests which I have made clearly shoW'that a truly fiat board treated by my method retains its precise flatness after the treatment. The

board is held and supported on edge with its opposite faces vertical, in such a manner that the portions of such opposite faces are entirely uncovered, and hence have free access to the atmosphere. The flame from the burners or torches directly impinge upon such uncovered portions, in freeaccess with the atmosphere. Furthermore, the holding and supporting means are not heated to a burning temperature. Tests which I have made show that if the holding and engaging means, such as rollers become heated'to a burning temperature, while engaging the board, that the rollers will burn into the board for a substantial depth and thus destroy the same. The burning or charring action by my method is uniformly distributed over the entire faces or sides, but penetrates for only a slight distance, ordinarily not more than one-thirty-seco-nd of an inch. The burning being effected rapidly by the flame directly impinging against the uncovered portions of the board in free access to the atmosphere',a charred surface or coating is immediately produced, and this coatin g serves as a heat insulator, to a considerable extent, in preventing the burning action penetrating too deeply into the board. I have found that the burning or'charring of the two surfaces of the board,-in no way effect the characteror quality of the board inwardly of the charred surfaces. After the two surfaces have become charred, they are preferably simultaneously subjected to a brushing action, Which is preferably transversely of the grain of the board. During the burning and brushing actions, the board is continuously fed longitudinally at a proper co-related speed, thus producing a' continuous method. When the board disboard is thus produced flames to the opposite sides of the board,-

charred surfaces are immediately produced. It is highly advantageous to have the opposite faces of the board vertical, as this produces working conditions which are identical. The heated gases from the two charred surfaces may, therefore, leave such surfaces at the same rate of speed, and it is possible to apply substantially the same degree of heat to the opposite vertical faces. The vertical arrangement of the faces also retains them in ready view of the operator,

so that he may properly observe the action ofthe heat treatment. The vertical arrangement of the faces is also advantageous when they are brushed, allowing of the dropping from the same of the charred material. However, some degree of success may be had by arranging the board sothat its opposite faces are horizontal or inclined. This would necessitate the adjustment of the burners, so that a proper amount of heat would be applied to the upper and lower faces. which would he more difficult, as the heated gases would tend to be held beneath the lower face, while they would freely escape from the upper face.

The present application is a division of and a continuation in part of my co-pending application for process for the ornamental treatment of wood, filed November 28, 1928, Serial No. 322.386 which has matured into Letters Patent No. 1,758,336.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of a machine embodying my invention,

Figure 2 is a central vertical longitudinal section through the same,

Figure 3 is a horizontal section taken on line 33 of Figure 1,

Figure 4 is a transverse section taken on line tl of Figure 1,

Figure 5 is a similar view taken on line 55'of Figure 1,

Figure 6 is an enlarged horizontal section taken through the burner frame on line 66 of Figure 4, and,

Figure 7 is a side elevation of a burner unit.

In the drawings, wherein for the purpose of illustration, is shown a preferred embodiment of my invention, the machine embodies a main stationary frame including a pair of lower horizontal beams 10, rigidly attached to vertical beams 11, extending downwardly below the same in the form of legs. The lower ends of the vertical beams 11 are connec ed by transverse bars 12. The upper ends of the vertical beams 11 are rigidly connected with horizontal longitudinal beams 13, and transverse beams 14.

Arranged within the main frame is the lumber or board supporting, holding and feeding means to effect the longitudinal travel of the board. This means embodies upper and lower pairs of bars 15 and 16, which are horizontally arranged and extend longitudinally of the main frame. These bars carry inwardly projecting brackets 17 and 18, respectively, having openings formed therein to receive the trunnions of transverse pairs of vertical rollers 19, 20, 21 and 22. The rollers in these transverse pairs are transversely spaced so that the board or the like may travel between the same. The pairs of rollers are also longitudinally spaced, as shown. The numeral 23 designates horizontal rollers, suitably mounted upon the beams 10, and arranged near the lower ends of the pairs of vertical rollers. These horizontal rollers serve to support the board during its longitudinal travel and to prevent the same from moving downwardly. Rollers 24 are provided to engage with the top edge of the board and these rollers are mounted in the forked ends 25, carried by vertical rods 26, longitudinally adjustably mounted within openmgs formed in stationary guides 27, and adapted to be clamped therein at selected elevations, by clamping screws 28. The upper horizontal guide rollers 24: are in alinement with, the spaces between the pairs of vertical rollers, and engage with the top edge of the board, and are adjustable to different elevations, depending upon the width of the board to be treated.

Means are provided to adjust the vertical rollers in transverse pairs toward and away from each other, so that they may receive therebetween boards of different thicknesses. To accomplish this, the lower horizontal beams 16 are provided near their ends with openings or bearings to receive transverse shafts 29 and 30, which are suitably journaled in bearings carried by the beams 10. The shafts 29 and 30 are rotatable and serve to support and guide the lower beams 16. These shafts are arranged beneath the end pairs of rollers 19 and 22, as shown. The upper beams 15 are provided near their ends with sockets 31, slidable upon stationary transverse bars 32. Secured to the right ends of the lower beams 16, Figure 3, are sleeves or bearings 33, having right and left lngs or sleeves 42, which have right and left screw-threads, and are rigidly attached to the left ends of the beams 16. It is thus seen that when the hand wheel 36 is turned, the opposite ends of the beams 16 will be simultaneously shiftedtoward or away from each other, in a transverse direction. The upper beams 15"are provided near their ends with bearings 43, having right and left screwthreaded openings to receive theright and left screw-threaded portions of transverse shafts 44. The shafts 44 are provided with sprocket wheels 45, engaged by vertical sprocket chains 46, engaging sprocket wheels 47 upon the shafts 35 and 40. It is thus apparent that the upper and lower pairs of bars 15 and 16 are adjusted transversely in unison, to bringthe vertical rollers in the transverse pairs toward or away from each other.- a g Means are provided to rotate the pairs of end rollers 19 and 22 in a direction to feed the boardlongitudinally of the machine, from left and right. Such means comprises bevel gears 48 and 49, rigidly attached to the lower ends of the rollers 19 and 22, to turn them.

Bevel gears 48, Figure 4, are engaged by bevel gears 50, which are splined upon the shaft 29, to move longitudinally thereof and turn therewith and are confined between beams 16 and the bevel gears 48. The bevel gears 49 are engaged by bevel gears 51, splined upon the shaft 30 to move longitudinally thereof and turn therewith and are confined between the beams 16 and the bevel gears 49, as clearly shown in Figure 5. The shaft 29 has a sprocket wheel 52, rigidly secured thereto, engaged by a horizontal sprocket chain 53, engaging a sprocket wheel 54, rigidly mounted upon the shaft 30. It is thus seen that the shafts 2.9 and 30 are geared together to turn in unison, to rotate the pairs of rollers 19 and 22, to effect the longitudinal travel of the board. While the rollers 20 and 21 are not shown as positively driven but function as idlers, yet the'invention is in no sense restricted to the driving of the end rollers alone, as theintermediate rollers may be driven, if desired. The shaft 29 is connected with and driven-by a motor 55, through the medium-of suitable speed reduction gearing 56, of any well known or preferred type,

Means are provided to simultaneously directly project flames upon opposite sides of the board as it is being fed longitudinally through the machine. This means embodies a reciprocatory support or carriage 57, Figure 4, preferably in the form of an open rectangular frame. This frame or carriage is vertically disposed and extends transversely of the main frame and is positioned between the rollers 19 and 20. The vertical sides of the carriage or frame 57 is equipped with flanges or ribs 58, engaging with grooved Wheels 59, attached to stationary vertical rails 60. The carriage or frame 57 is, therefore, adapted to partake of a vertical reciprocatory movement and is guided in such movement. This carriage or frame extends well below the beams 16 so that it does not strike the same upon its upward movement. Sets of burners 61, of the blow-torch type are arranged upon opposite sides of the rollers 20 and are adapted to directly project flames upon the opposite sides of the board, between the rollers l9 and 20. The opposite faces of the board are vertical, and between rollers 19 and 20 are wholly uncovered, and hence have free access to the atmosphere. Each set of burners embodies a plurality of burners 61, vertically spaced, as shown. The burners are suitably clamped to a vertical. rod 62, which is clamped near its upper and lower ends to U-shaped brackets 63. Short rods 64 are clamped to the end pairs of burners 61 and clamped to the opposite arms of the U-shaped brackets 63. The U-shaped' brackets are pivoted to swing horizontally upon horizontal arms 65, by means of bolts 66, adapted tobe inserted in selected openings 69. The sets of burners may be adjusted towardandaway from each other by inserting the bolts 66 in selected openings 69, and they are further adjustable toward and away fromeach other, without disturbing the pivots 66, by swinging the brackets 63 upon their pivots. As clearly shown in Fig. 6, links 70 are pivoted to the upper ends ofthe'rods 62, and these links are pivoted to a horizontally swinging lever 71- upon opposite sides of its fixed pivot 72.

ence by swinging lever 71 upon its pivot, the two sets of burnersmay be simultaneously shifted toward and away from each other. This adjustment of the burners is necessary to properly apply the flames being project- 7 ed upon the opposite faces of the board. The

it advantageous to feed gas into the opposite ends of the gas pipe inorder that gas may be uniformly distributed to all of the burners. The flexible hose for supplying gas and air to the burners permits of the reciprocatory movement of the burner frame or carriage. The tubes 7 3 and 7 4 are equipped with cut-off valves 79, so that each burner may be cut out of operation, when desired. Thus when a board being treated is narrow, the proper number of upper burners may be closed.

Inorder that the rollers 19 may not be heated to a burning temperature, I preferably mount heat insulating guards between them and the burners, such guards embodylng sheets of asbestos 81, or the like. These guards are rigidly attached to the upper and lower beams 15 and 16 and are transversely adjustable with them, to provide a suitable space between the same for the passage of the board. While it is preferred to use these heat insulating guards, yet the invention is not restricted to the same, as Satisfactory results are obtainable by arranging the rollers 19 a suitable distance from the burners so that heating of the rollers to a burning temperature is not possible. In the practice of the method, particular care must be taken that none of the rollers engaging the board are heated to a burning temperature, as I have found that should the rollers become heated to a burning temperature, they will burn deep into the wood, thus destroying the same.

Rigidly attached to the top of the reciprocatory frame or carriage 57 is a rigid link 82, having a cross head 83, rigidly secured thereto. This cross head has a horizontal transverse opening 84, receiving the roller 85, car ried by a stud 86. This stud is rigidly secured to a rotatable disc 87, mounted upon a shaft 88, journaled in stationary bearings 89, suitably mounted upon the upper beams 17 of the main frame. The shaft 88 is equipped with a pulley 90, as shown.

Means are provided to simultaneously brush the opposite vertical charred faces of the board, to remove the charred surfaces from the same. This means, Figure 5, embodies a pair of spaced vertical rails or bars 91', provided at their upper and lower ends with bearings 92, having right and left screwthreaded openings to receive right and left screw-threaded portions 93, formed upon the upper and lower shafts 94 and 95. The lower shaft 95 is suitably journaled upon the beams 11 while the upper shaft 94 is suitably journaledwithin an upper frame work 96. The shaft 94 is equipped with a hand wheel 97.

The shaft 94 is provided at its opposite end with a sprocket wheel 98, engaging the vertical sprocket chain 99 extending downwardly to engage a sprocket wheeel 100, rigidly mounted upon the shaft 95. It is thus seen 106, which are U-shaped in cross section, and

receive b u shes 107, having wire bristles. The brushes in each set are arranged in a vertical row, of a length to act upon the board having the maximum width. The inner rails are provided at their ends with openings to receive upper and lower rods 108 and 109. A spring 110 surrounds the rod 109 and tends to force the rails 105 outwardly into engagement with grooved wheels 102. A link 111 is mounted upon the upper rod 108 and springs 112 surround the rod 108 and tend to force the rails 105 outwardly. The link 111 has a longitudinal slot 113 formed therein, for the passage of the shaft 94. The link 111 extends upwardly and is rigidly attached to a cross head 114 equipped with grooved wheels-115, engaging stationary rails 116. The cross head 114 has a transverse horizontal opening 117, receiving a roller 118 carried by a stud 119, secured to a disc 120. This disc is rigidly secured to a shaft 121 mounted in bearings 122, which is suitably mounted upon the upper beams 17, of the frame. The shaft 121 is provided with a pulley 123. Retractile coil springs 124 are connected with the cross heads 83 and 114 and to a frame work 125, and serve to support some of the weight of the cross heads and associated elements. The pulley 123 is engaged by a belt 126, engaging a smaller pulley 127, rigidly mounted upon the shaft 128. The shaft 128 is rotated by a pulley 129 driven by any suitablemeans. The shaft 128 has a small pulley 130, rigidly secured thereto, driving a belt 131, in turn drivlng the pulley 90. The pulley 123 is much smaller than the pulley 90, so that the two sets of brushes are reciprocated at a higher speed than the two sets of burners.

The operation of the machine is as follows:

The sets of-burners 61 are thrown into operation and properly adjusted so that the proper amounts of air and gas are supplied to the same so that hot flames are provided, which are projected inwardly from the sets of burners. The board to be treated is now arranged on edge and supported upon the horizontal rollers 23 to the left, at the rear.

with the opposite sides of the board, when the board reaches the same. The sets of burners are now being reoiprocated relatively slowly while the sets of brushes are reciprocating at a faster rate of speed. The motor 55 is started and the shafts 29 and 30 are rotated at a reduced speed. This rotates the rollers 19 and 22 relatively slow. The speed of rotation of the drive rollers determines speed at which the board is to be fed through the machine, and I have found that satisfactory results are obtainable by feeding a board of about six feet in length through the machine at such a speed that it will pass between the two reciprocatory brushes in about four minutes. As the board passes forwardly of the rear feeding rollers 19, its opposite faces are vertical and wholly uncovered and in free access to the atmosphere. The flames are projected inwardly upon opposite sides of the board and directly impinge upon the vertical uncovered faces of the opposite sides of the board. The burners are reciprocating vertically and the flames are evenly distributed over the surface of the board. The action of the flames is" to quickly burn or char the entire surface upon opposite sides of the board, and I have found that this burning or charring extends inwardly for only a slight distance, such as one-thirty-sec- 0nd of an inch, and the inner portion of the board is not affected or deteriorated by the heat action. The forward end of the board now passes between the guide rollers 20 and then between the guide rollers 21, and then between the reciprocatory brushes 107. The oppositesides of the board are now thoroughly brushed and all of the loose charred surface is removed. The brushing action is transversely or at a right angle to the grain of the wood, which'has been found to be very satisfactory in completely removing all of the loose charred surface. tion occurs and continues while the rear portidnof the board is being burned or charred and the method is, therefore, continuous. The board continues its longitudinal movement and passes between the forward feed rollers 22 before it disengages the rear feed rollers and is finally discharged from the ma chine over the forward horizontal rollers 23.

When theboard is discharged from the ma-.

chine, it will be found that it will be substantially at atmospheric temperature and is ready to be used. It is thus seen that both sides of the board are simultaneously burned or charred and both sides are brushed.- When the board discharges from the machine, it

will be found to be flat and there is no tendency for the board to warp, due to the The brushing ac- It is to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts, may be resorted to without departing from the spirit of my invention, or the scope of the subjoined claims.

Having thus described my invention, I claim: V

1. In a machine for treating wood for producing a weathered or antique appearance, means for supporting and holding aboard so that it may be fed longitudinally, said means also affording uncovered portions of the opposite faces of said board which are in free access to the atmosphere, and means for directly projecting burning heat upon the uncovered portions of said opposite faces so that said faces are simultaneously charred.

2. In a machine for treating wood for producing a weathered or antique'appearance,

means for supporting and holding a board and for effecting the longitudinal feeding of the board, said means holding the board so that portions of the opposite faces ofthe board are uncovered and in free access to the atmosphere, and means to directly project flames upon the uncovered portions of the opposite faces of the board so that both faces are simultaneously, charred.

3. In a machine for treating wood for producing a weathered or antique appearance, substantially vertical guide means for receiving and holding a board upon edge so that its opposite, faces are substantially vertical and so that the board may be fed longitudinally, saidguide means being so constructed that portions .of said faces are uncovered and in free access with the air, and means for directly projecting burning heat upon such uncovered portions of said faces so that both guide means for receiving and holding a board, said guide means being so constructed that portions of the opposite faces of the board are uncovered and in free access to the atmosphere, burner means for directly projecting flames upon such uncovered portions of said faces in the presence of the atmosphere so that both sides of the board are simultaneously charred, and means for removing the charred coating from one side of the board.

5. In a machine for treating wood for pro-- ducing a weathered or antique appearance,

uide means for receiving and holding a floard upon edge so that its opposite faces are substantially vertical, said guide means being so constructed that portions of said faces are uncovered and in free access to the atmosphere, burner means for directly promeans.

6. In a machine for treating wood for producing a weathered'or antique appearance, guide means for receiving and holding a board and so constructed that portions of the opposite faces of the board are uncovered and in free access to the atmosphere, burners arranged upon opposite sides of the board and projecting flames directly upon the uncovered portions of said faces whereby both sides of the board are charred, brushes arranged to engage the charred faces of the board, means to move the brushes, and means whereby the board may be fed longitudinally through the guide means.

7. In a machine for treating wood for producing a weathered or antique appearance, uide means for receiving and holding the board and so constructed that portions of the opposite faces of the board are uncovered and in free access to the atmosphere, burners arranged upon opposite sides of the board and projecting flames directly upon the uncovered portions of said faces whereby both sides of the board are charred, means to shift the burners transversely of the board, and means whereby the board may be fed longitudinally through the guide means.

8. In a machine for treating wood for producing a weathered or antique appearance, guide means for receiving and holding a board, said guide means being so constructed that portions of the opposite faces of the board are uncovered and in free access to the atmosphere, burners arranged upon opposite sides of the board and projecting flames directly upon the uncovered portions of said faces so that both sides of the board are charred, and adjustable means to shift the burners toward or away from said faces.

9. In a machine for treating wood for producing a weathered or antique appearance, uide means for receiving and holding a board upon edge so that its opposite faces are substantially vertical, said guide means being so constructed that portions of said faces are uncovered and in free access to the atmosphere, a vertically movable burner carriage, burners mounted upon the carriage and arranged upon opposite sides of the board to directly project flames upon the uncovered portions of said faces so that both sides of the board are charred, and means to impart a back and forth movement to the burner carriage.

10. In a machine for treating wood for pro-' ducing a weathered or antique appearance, guide means for receiving and holding a board, said guide means being so constructed that portions of said opposite faces of the board are uncovered and in free access to the atmosphere, a reciprocatory burner carriage extending transversely of the board, means to reciprocate the carriage, and burners disposed upon opposite sides of the board and mounted upon the carriage and projecting flames directly upon the uncovered portions of said faces so that both sides of the board are charred.

11. Ina machine for treating wood for producing a weathered or antique appearance, guide means for receiving and holding a board upon edge so that its opposite faces are substantially vertical, said guide means being so constructed that portions of said .faces are uncovered and in free access to the atmosphere, a reciprocatory burner carriage extending transversely of the board, means to reciprocate the carriage, and burner units pivotally mounted upon the carriage upon opposite sides of the board so that they may be swung toward and away from the board.

12. In a machine for treating wood for producing a weathered or antique appearance, guide means-for receiving and holding a board upon edge, said guide means being so constructed that portions of the opposite faces of the board are uncovered and in free access of the atmosphere, a support, burner units disposed upon opposite sides of the board to directly project flames upon said uncovered portions, means to pivotally mount the burner units upon the support so that they may be shifted toward and away from the board, and a common operating device connected with the "burner units to simultaneously swing them toward or away from the board.

13. In a machine for treating wood for producing a weathered or antique appearance, a support, longitudinally spaced transverse pairs of rollers mounted upon the support, the rollers in each transverse pair being spaced to receive a board between the same, the portions of the opposite faces of the board between the pairs of rollers being uncoveredand in free access to the atmosphere, burners arranged upon opposite sides of the board and projecting flames directly upon said uncovered portions of the faces so that both sides of the board are charred, and means to drive certain of the rollers.

14. In a machine for treating wood for pro- ,ducing a weathered or antique appearance,

upon opposite sides of the board and projecting flames directly upon said uncovered portions of the faces so that both sides of the board are charred; 15. In a machine for treating wood for prov ducin g a weathered or antique appearance, a support, longitudinally spaced transverse pairs of rollers mounted upon the support, the rollers in each transverse pair being spaced to receive a board between the same, portions of the opposite faces ofthe board between the pairs of rollers being uncoveredand in free access to the atmosphere, means. to laterally move the rollers in the transverse pairs to bring them into proper engagement with. the

board, means to drive certain of the rollers, Q and burners arranged upon opposite sides of the'board and rojecting flames directly upon said uncovere portions of the faces so that both sides of the board are charred.

16. In a machine for treating wood for producing a vweathered or antique appearance, guide means for receiving and holding a board, the guide means being so constructed that portions of the opposite faces of the.

board are uncovered and in access to the atmos'phere, burners arranged upon opposite sides to the board and directly projecting flames uponthe uncovered portions of, said faces so that both sides of the board are charred, brush elements arrangedupon opposite sides of the board, means to move the brush elements into engagement with the oppositevfaces of v the .board,.and means to move the brush elements with relation to the board. w I l W 17 5 In a machine for treating woodfor producing a weathered or antiqueia'ppearance,i. guide means for receiving and "holding a 40 board upon edge so that its opposite faces. are generally vertically arranged, the guide means being so constructed that portions of said faces are uncovered and in free access to the atmosphere, burners arranged upon opposite sides of the board and directly projecting flames upon the uncovered portions of. said faces so that both sides of the board are charred, reciprocatory brush elements extending transversely of the board upon opposite sidesof the same, means-t0 adjust the brush elements into engagement with the opposite faces of the, board, and means to reciprocate the brush elements. a In testimony whereof I aflix my si ature. EMIL SC

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