CA1087498A - Method and apparatus for manufacturing wood mouldings - Google Patents
Method and apparatus for manufacturing wood mouldingsInfo
- Publication number
- CA1087498A CA1087498A CA321,660A CA321660A CA1087498A CA 1087498 A CA1087498 A CA 1087498A CA 321660 A CA321660 A CA 321660A CA 1087498 A CA1087498 A CA 1087498A
- Authority
- CA
- Canada
- Prior art keywords
- rip
- flawless
- flaw
- moulding
- portion containing
- 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
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title description 6
- 239000002023 wood Substances 0.000 title description 6
- 210000001503 joint Anatomy 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 230000000295 complement effect Effects 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- OYFJQPXVCSSHAI-QFPUQLAESA-N enalapril maleate Chemical compound OC(=O)\C=C/C(O)=O.C([C@@H](C(=O)OCC)N[C@@H](C)C(=O)N1[C@@H](CCC1)C(O)=O)CC1=CC=CC=C1 OYFJQPXVCSSHAI-QFPUQLAESA-N 0.000 description 2
- 210000001145 finger joint Anatomy 0.000 description 2
- 235000007173 Abies balsamea Nutrition 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 241000353097 Molva molva Species 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000218685 Tsuga Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- GFWRVVCDTLRWPK-KPKJPENVSA-N sofalcone Chemical compound C1=CC(OCC=C(C)C)=CC=C1\C=C\C(=O)C1=CC=C(OCC=C(C)C)C=C1OCC(O)=O GFWRVVCDTLRWPK-KPKJPENVSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
- B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
- B27M3/002—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected at their ends
-
- 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
- B27G1/00—Machines or devices for removing knots or other irregularities or for filling-up holes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
Abstract
A B S T R A C T
A method of converting a longitudinally elongated moulding rip having a portion containing a flaw such as a knot which is unacceptable in clear grade mouldinqs, into a substantially flawless premium length clear grade moulding, the rip having first and second flawless portions of substantially matching grain and a length less than a premium length, on either side of the portion containing the flaw, comprises the steps of cutting said rip transversely of its longitudinally elongated extent at both ends of the portion containing the flaw to provide smooth complemen-tary first and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, removing the portion containing the flaw from between said first and second scarf joint faces, bonding said first and second scarf joint faces of said first and second flawless portions to one another to form a scarf joint connecting said first and second flawless portions to form a rip having a premium length, working the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
A method of converting a longitudinally elongated moulding rip having a portion containing a flaw such as a knot which is unacceptable in clear grade mouldinqs, into a substantially flawless premium length clear grade moulding, the rip having first and second flawless portions of substantially matching grain and a length less than a premium length, on either side of the portion containing the flaw, comprises the steps of cutting said rip transversely of its longitudinally elongated extent at both ends of the portion containing the flaw to provide smooth complemen-tary first and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, removing the portion containing the flaw from between said first and second scarf joint faces, bonding said first and second scarf joint faces of said first and second flawless portions to one another to form a scarf joint connecting said first and second flawless portions to form a rip having a premium length, working the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
Description
~ 87~
l~IELD OF IL~ JTI;):~
This invention relates to tsle ~anufacture of clear grade wood mouldings. In particular, this invention relates to a method of convertin~ a longitudinally elongated moulding rip having a flaw containin~ portion therein into a flawless premi~ length clear grade moulding.
PRIOR ART
~ ood mouldings are currently manufactured in both "paint grade" and "clear grade" quality. The "paint ~rade" mouldings are mouldings which are intended to be painted upon installation~and consequently the quality of the surface finish of the moulding is not important.
Paintgrade mouldings tend to be inexpensive mouldings and are not the type of moulding to which the present invention relates. "Clear grade`' or '`natural grade"
mouldings are mouldings in which the surface finish must be substantially free of flaws such as those resulting from the presence of a '`knot'`.
Moulding manufacturerc; customarily obtain good quality lumber for use in the ~anufacture of "clear grade"
- mouldings, Generally, the moulding rip of the quality used for producing clear ~rade mouldin~ will have an avera~e length of aboutt~elve feet and will contain no more than two flaws.
In the present method of manufacturing mouldings, the board which is purchased by the moulding manufacturer is cut into rips of approximate width required by the moulding, the rips are then worked to provide the required mould profile and if flaws are present, the portions`
~0 containing the flaws are cut out of the length. Conse-quently, the manufacturer finds that from any particular batch o~ lumber wh:ich he machines in tAe conventional - , , : . - , . - ~ :~
7~
manner he produces a nun~er o~ leng~hs measuring seven feet and over, all of whicll he can classify as "premium lenath" lur~er and a number of lengtns which are less than seven feet but fall within the range of about three to six feet whicn are ~nown as "shorts", If the purchaser is prepared to pay a premium price, which may be about 20% greater than the standard lineal price for mouldings, he may be able to obtain mouldings all of which are of the "premium length" that is to say, seven feet or over. In some instances, a purchaser may be prepared to pay this additional price ~nowing that "shorts" are no value to him in a particular application.
By far the greatest volume of moulding sales are those in which the purchaser i5 prepared to pay the standard lineal price for mouldings ancl as a result of which he is required to accept up to 20Q shorts in any one order, As previously indicated, shorts are lengths measuring from tnree to six feet. Irhe remainder of the load will be of the "premium len~th".
In n~st instances, the purchaser would prefer to receive all of the order in units o the'premium length", however, he accepts the load including the silorts in order to avoid payment of the "premium price". In many instances, the shorts cannot be ef~ectively used and are merely discarded as waste~
Despite the fact that the desirability of providing mouldings in the "premi~ length" has been ~nown for some considerable time, the industry has continued to accept the practice of including "shorts" in a standard load.
: . . ' : - -.. . . . ' , . .:
In the production of "paint grade" mouldings, - it is known to use a "finger joint'` to connect "shorts`'.
The "finger joint" is however quite unsuitable for use in the production of clear grade mouldings because in tne forming of the profile of ~e moulding, various portions of the mating fingers of the joint are exposed thereby creating a disruption in the pattern at tne face of ~le moulding which is not acceptable in "clear grade'` mouldings becaus~ these mouldings are generally finished in a manner which will permit the grain of the ~ood to be visible at the surface of the moulding.
~ "scarf joint" is a joint w;~ich is known to s~illed carpenters and has been used by s~illed carpenters for connec:ting lengths o mouldings at a job site in order to provide lengths suitable for use in finishing a room or the like, particularly where the length required is greater than the "premium length'`. This practice has, however, relied to a very large extent on ~le s~ill of the individual carpenter and is not widely used because considera~le skill i5 required in order to make an effective scarf joint. Consequently, in most cases a simple butt joint is made by a carpenter in present day installation where a joint is necessary. The scarf joint requires a very precise cutting of ~le moulding in a plane which is ~` angularly inclined in two directions with respect to the lon~itudinal extent of the moulding. Because of the complexity of the scarf joint, it is not widely used in the installation of mouldings. It is to be noted that the use of a scarf joint in this application is limited to a joint made by a carpenter in a finisiled moulding. To the best of my knowledge a scarf joint has not previously .: -. - . .. . .- . ... . . - . -..... . -. . , :. . : , . : .
: : . - . . , . ~ , ~Q8791~
been use~ in a preliminary step in the manufacture of moulding prior to the machining of the required mouldiny contour.
The present invention overcomes the difficulties of the prior art described above and provides a method of manufacturing substantially flawless premium length mouldings from moulding rips Aaviny portions containing a flaw which is unacceptable in a clear grade moulding.
According to one aspect of the present invention there i5 provided a method of converting a longitudinally elon~ated moulding rip having a portion containing a flaw such as a knot which is unacceptable in clear grade mouldings, into a substantially flawless premium length mouldincl, the rip having first and second flawless portions of substantially matching grain and a length less than a premium length, on either side of the portion containing the flaw, comprising tlle steps of; cutting said rip trans-versely of its longitudinally elon~ated extent at both ends of the portion containing theflaw to provide smooth complPmentary ~irst and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, removing ` the portion containing the flaw from between said first and second scarf joint faces, bonding said first and second scarf joint faces d said first and second flawless portions to one another to form a scarf joint connecting said irst and second flawless portions to form a rip havin~ a premi-u~l length, wor~ing the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
.; ';',. ~,.
, ' ; r ~7~
The invention will be more clearly understood ~-after reference to the following detailed specification read in conjunction with ~le drawings wherein;
Figure 1 is a pictorial view of a longitudinally elon~ated moulding rip in which flaws are present;
Figure 2 is a plan view of a portion of tne rip of Figure 1 after ~le removal of the portion containing the flaw;
Figure 3 is a side view of the rip of Figure 1;
Figure 4 is a pictorial view of the first and second flawless portions arranyed with the scarf joint faces disposed in abutting relationship;
Figure 5 i5 a pictorial view of a finished moulding :Eormed from the rip of Figure l;
Figure 6 is a pictorial view of an apparatus ..
for use in positioning the scarf joint faces OL the ends of adjacent flawless portions in an ~uttin~ relationship and forming a ~ond therebetween, With raference to Figure 1 of the drawings, the reference numeral 10 refers generally to a longitudinally elongated moulding rip. Moulding rip 10 has two portions containing flaws which are identified by the reference numeral 14 and three flawless portions 12a, 12b and 12c.
The flaw in the portions 14 may ~e in the form of a knot or a surface damage of the type which would make it impossible to conver.t the rip into a premium length moulding. To be acceptable for conversion by the method of the present invelltion, the length Ll must be greater than the premium length, which is generally about seven feet, ~08 ~498 by an amount equal to tne sum of the length L2 and L3 which must be removed in order to remove the portions 1~.
~ lavin~ determined that a sufficient len~th may remain after the removal of the portions containing the flaw, the rip is then cut on either side of the flaw to form s~ooth complementary first and second scarf joint faces 18 and 20. Preferably the scarf joint aces 18 and 20 are angularly inclined to the width of ~e rip at an angle O~ of about 45 and through the thic~ness of the rip at an angle ~ of about 45.
~n adhesive is then applied to one or both of the scarf joint faces 18 and 20 o adjacent flawless portions 12a and 12b or of adjacent flawless portions 12b and 12c.
e flawless portions 12a are preferably connected to the flawless portions 12b rather than to the flawless portions 12c so that there is a minimum disrruption in the natural grain pattern of the wood at each joint.
This is im~ortant because of the desire to provide mouldin~s of a clear grade.
The portions 12a and 12b are positioned as illustrated in Fig. 4 of the drawings with the scarf faces 18 and 20 in abutting relationship. As will be described hereinafter the machine used to form the bond provides clamping forces in the direction of the arrows 22, 24 and ' 26 which serve to maintain a pressure a-t the interface ; until the ~ond ~ormed therebetween is set~ It has been found ~lat with present technology a satisfactory bond can be obtained in a very short period of time hence by the use of a hi~h frequency gluing technique. A
suitable adhesive for use in forming the required bond is ' ~ .
.: . .
available from Borden Chemicals, Division of Borden Inc., and identified by the trade marks CASCO-P~SI.~ 5~1, CASCO-~ESI-~595, CASC~IIT~ 12 and I~ONDER BO'~ !B-90~.
The flawless portions 12b and 12c are bonded to one ano~ler in the manner previously described with respect to flawless portions l a and 12b.
Tile rip thus formed will have a lengtn which is at least equal to the required "premium lensth" of the moulding to be produced ~erefrom. Tlle xip is then worked in conventiO ~ mould ~rming machinery to the required contour. Because ~e joints previously forr,~ed in the rip are scarf joints the only evidence of the joint which is visible at the surface of the moulding is a simple hair line 21 which will extend obliquely across t:he finished face in attrusive straight line. It will be noted that one attempt has been made to illustrate the normal grain pattern of a wood moulding in Figure 5 with the result that the hair line 21 is much more conspicuous in tllis illustration than it is in a wood moulding h~ving a normal wood grain finish. It has been found that tne joint produced in this manner is totally acceptable in most mouldings as being less of a disruption in the face of the moulding that natural imperfections and variations in grain C}laracter o mouldings.
It has been found that clear grade mouldings can be produced by the moulding of the present invention in a wide variety of woods commonly used in clear grade quality includin~ mahogony, walnut, oak and the li]ce and it may also be used in ~he less expensive woods such as ' 30. pine, spruce, fir ~nd hemlock.
:, ' ,, . , . . ~ :
74~
In Figure 6 of tlle dra~7ings, the re~rence numeral 30 refers generally to a machine for positionin~
the sash joint faces in an abuttina relationship in order to Pffect gluin~ thereof. The machine includes a stationary table 3 on wllich a platform 34 is mounted to reciprocate in the direction oE the arrows ~,. A pair of finger3 3G
are arranged to project upwardly through slots 38 and 40 formed in the platform 34 and table 32 respectively. The finse~s 36 are mounted to be reciprocally driven in the direction of the arrows B toward and away from a back stop plate 40. ~ pair of pressure pads 42 are positioned above the~ ta~le 32 and platform 34 respectively and are mounted on reci~rocating drive units 44 so a-. to be recipro-cally driven toward and away from the table 32 and platform 34 respectively in the direction of the arrow C. A high frequency glue head 46 is lacated above the platform 34 so as to dlrect high frequency energy to the scæf joint in use.
In use, a flawless length 12b may be located on the table 32 and a fla~less length l~a may be located on the platform 34 with their scarf joint faces 18 and 20 positioned adjacent one another, preferably in a simple abutting relationship. The various cla7,nping necllanisms are then activated to engage the flawless portions 12a and 12b and to move them toward one another to firmly clamp the scarf faces 18 and 20 against one anotller. The high frequency gluing machine is then activated to form the required bond. Thereafter the rip is removed and a further joint made at the second set ~ ;
of sash joint faces.
~ 3~
:~; From the foregoing it will be apparent that the present invention provides a simple and efficient metilod of convertin~ a longitudinally elonqated mouldins rip havin~ a ~ortion contai.ning a flaw into a flawless premium lengtil mouldins.
.
~` ','' :. ,.
;,. -:
.`, , . ~.
:~ ~ ~ ~ '' '''; ~.
~ i ~, .~ .
~ '' .
l~IELD OF IL~ JTI;):~
This invention relates to tsle ~anufacture of clear grade wood mouldings. In particular, this invention relates to a method of convertin~ a longitudinally elongated moulding rip having a flaw containin~ portion therein into a flawless premi~ length clear grade moulding.
PRIOR ART
~ ood mouldings are currently manufactured in both "paint grade" and "clear grade" quality. The "paint ~rade" mouldings are mouldings which are intended to be painted upon installation~and consequently the quality of the surface finish of the moulding is not important.
Paintgrade mouldings tend to be inexpensive mouldings and are not the type of moulding to which the present invention relates. "Clear grade`' or '`natural grade"
mouldings are mouldings in which the surface finish must be substantially free of flaws such as those resulting from the presence of a '`knot'`.
Moulding manufacturerc; customarily obtain good quality lumber for use in the ~anufacture of "clear grade"
- mouldings, Generally, the moulding rip of the quality used for producing clear ~rade mouldin~ will have an avera~e length of aboutt~elve feet and will contain no more than two flaws.
In the present method of manufacturing mouldings, the board which is purchased by the moulding manufacturer is cut into rips of approximate width required by the moulding, the rips are then worked to provide the required mould profile and if flaws are present, the portions`
~0 containing the flaws are cut out of the length. Conse-quently, the manufacturer finds that from any particular batch o~ lumber wh:ich he machines in tAe conventional - , , : . - , . - ~ :~
7~
manner he produces a nun~er o~ leng~hs measuring seven feet and over, all of whicll he can classify as "premium lenath" lur~er and a number of lengtns which are less than seven feet but fall within the range of about three to six feet whicn are ~nown as "shorts", If the purchaser is prepared to pay a premium price, which may be about 20% greater than the standard lineal price for mouldings, he may be able to obtain mouldings all of which are of the "premium length" that is to say, seven feet or over. In some instances, a purchaser may be prepared to pay this additional price ~nowing that "shorts" are no value to him in a particular application.
By far the greatest volume of moulding sales are those in which the purchaser i5 prepared to pay the standard lineal price for mouldings ancl as a result of which he is required to accept up to 20Q shorts in any one order, As previously indicated, shorts are lengths measuring from tnree to six feet. Irhe remainder of the load will be of the "premium len~th".
In n~st instances, the purchaser would prefer to receive all of the order in units o the'premium length", however, he accepts the load including the silorts in order to avoid payment of the "premium price". In many instances, the shorts cannot be ef~ectively used and are merely discarded as waste~
Despite the fact that the desirability of providing mouldings in the "premi~ length" has been ~nown for some considerable time, the industry has continued to accept the practice of including "shorts" in a standard load.
: . . ' : - -.. . . . ' , . .:
In the production of "paint grade" mouldings, - it is known to use a "finger joint'` to connect "shorts`'.
The "finger joint" is however quite unsuitable for use in the production of clear grade mouldings because in tne forming of the profile of ~e moulding, various portions of the mating fingers of the joint are exposed thereby creating a disruption in the pattern at tne face of ~le moulding which is not acceptable in "clear grade'` mouldings becaus~ these mouldings are generally finished in a manner which will permit the grain of the ~ood to be visible at the surface of the moulding.
~ "scarf joint" is a joint w;~ich is known to s~illed carpenters and has been used by s~illed carpenters for connec:ting lengths o mouldings at a job site in order to provide lengths suitable for use in finishing a room or the like, particularly where the length required is greater than the "premium length'`. This practice has, however, relied to a very large extent on ~le s~ill of the individual carpenter and is not widely used because considera~le skill i5 required in order to make an effective scarf joint. Consequently, in most cases a simple butt joint is made by a carpenter in present day installation where a joint is necessary. The scarf joint requires a very precise cutting of ~le moulding in a plane which is ~` angularly inclined in two directions with respect to the lon~itudinal extent of the moulding. Because of the complexity of the scarf joint, it is not widely used in the installation of mouldings. It is to be noted that the use of a scarf joint in this application is limited to a joint made by a carpenter in a finisiled moulding. To the best of my knowledge a scarf joint has not previously .: -. - . .. . .- . ... . . - . -..... . -. . , :. . : , . : .
: : . - . . , . ~ , ~Q8791~
been use~ in a preliminary step in the manufacture of moulding prior to the machining of the required mouldiny contour.
The present invention overcomes the difficulties of the prior art described above and provides a method of manufacturing substantially flawless premium length mouldings from moulding rips Aaviny portions containing a flaw which is unacceptable in a clear grade moulding.
According to one aspect of the present invention there i5 provided a method of converting a longitudinally elon~ated moulding rip having a portion containing a flaw such as a knot which is unacceptable in clear grade mouldings, into a substantially flawless premium length mouldincl, the rip having first and second flawless portions of substantially matching grain and a length less than a premium length, on either side of the portion containing the flaw, comprising tlle steps of; cutting said rip trans-versely of its longitudinally elon~ated extent at both ends of the portion containing theflaw to provide smooth complPmentary ~irst and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, removing ` the portion containing the flaw from between said first and second scarf joint faces, bonding said first and second scarf joint faces d said first and second flawless portions to one another to form a scarf joint connecting said irst and second flawless portions to form a rip havin~ a premi-u~l length, wor~ing the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
.; ';',. ~,.
, ' ; r ~7~
The invention will be more clearly understood ~-after reference to the following detailed specification read in conjunction with ~le drawings wherein;
Figure 1 is a pictorial view of a longitudinally elon~ated moulding rip in which flaws are present;
Figure 2 is a plan view of a portion of tne rip of Figure 1 after ~le removal of the portion containing the flaw;
Figure 3 is a side view of the rip of Figure 1;
Figure 4 is a pictorial view of the first and second flawless portions arranyed with the scarf joint faces disposed in abutting relationship;
Figure 5 i5 a pictorial view of a finished moulding :Eormed from the rip of Figure l;
Figure 6 is a pictorial view of an apparatus ..
for use in positioning the scarf joint faces OL the ends of adjacent flawless portions in an ~uttin~ relationship and forming a ~ond therebetween, With raference to Figure 1 of the drawings, the reference numeral 10 refers generally to a longitudinally elongated moulding rip. Moulding rip 10 has two portions containing flaws which are identified by the reference numeral 14 and three flawless portions 12a, 12b and 12c.
The flaw in the portions 14 may ~e in the form of a knot or a surface damage of the type which would make it impossible to conver.t the rip into a premium length moulding. To be acceptable for conversion by the method of the present invelltion, the length Ll must be greater than the premium length, which is generally about seven feet, ~08 ~498 by an amount equal to tne sum of the length L2 and L3 which must be removed in order to remove the portions 1~.
~ lavin~ determined that a sufficient len~th may remain after the removal of the portions containing the flaw, the rip is then cut on either side of the flaw to form s~ooth complementary first and second scarf joint faces 18 and 20. Preferably the scarf joint aces 18 and 20 are angularly inclined to the width of ~e rip at an angle O~ of about 45 and through the thic~ness of the rip at an angle ~ of about 45.
~n adhesive is then applied to one or both of the scarf joint faces 18 and 20 o adjacent flawless portions 12a and 12b or of adjacent flawless portions 12b and 12c.
e flawless portions 12a are preferably connected to the flawless portions 12b rather than to the flawless portions 12c so that there is a minimum disrruption in the natural grain pattern of the wood at each joint.
This is im~ortant because of the desire to provide mouldin~s of a clear grade.
The portions 12a and 12b are positioned as illustrated in Fig. 4 of the drawings with the scarf faces 18 and 20 in abutting relationship. As will be described hereinafter the machine used to form the bond provides clamping forces in the direction of the arrows 22, 24 and ' 26 which serve to maintain a pressure a-t the interface ; until the ~ond ~ormed therebetween is set~ It has been found ~lat with present technology a satisfactory bond can be obtained in a very short period of time hence by the use of a hi~h frequency gluing technique. A
suitable adhesive for use in forming the required bond is ' ~ .
.: . .
available from Borden Chemicals, Division of Borden Inc., and identified by the trade marks CASCO-P~SI.~ 5~1, CASCO-~ESI-~595, CASC~IIT~ 12 and I~ONDER BO'~ !B-90~.
The flawless portions 12b and 12c are bonded to one ano~ler in the manner previously described with respect to flawless portions l a and 12b.
Tile rip thus formed will have a lengtn which is at least equal to the required "premium lensth" of the moulding to be produced ~erefrom. Tlle xip is then worked in conventiO ~ mould ~rming machinery to the required contour. Because ~e joints previously forr,~ed in the rip are scarf joints the only evidence of the joint which is visible at the surface of the moulding is a simple hair line 21 which will extend obliquely across t:he finished face in attrusive straight line. It will be noted that one attempt has been made to illustrate the normal grain pattern of a wood moulding in Figure 5 with the result that the hair line 21 is much more conspicuous in tllis illustration than it is in a wood moulding h~ving a normal wood grain finish. It has been found that tne joint produced in this manner is totally acceptable in most mouldings as being less of a disruption in the face of the moulding that natural imperfections and variations in grain C}laracter o mouldings.
It has been found that clear grade mouldings can be produced by the moulding of the present invention in a wide variety of woods commonly used in clear grade quality includin~ mahogony, walnut, oak and the li]ce and it may also be used in ~he less expensive woods such as ' 30. pine, spruce, fir ~nd hemlock.
:, ' ,, . , . . ~ :
74~
In Figure 6 of tlle dra~7ings, the re~rence numeral 30 refers generally to a machine for positionin~
the sash joint faces in an abuttina relationship in order to Pffect gluin~ thereof. The machine includes a stationary table 3 on wllich a platform 34 is mounted to reciprocate in the direction oE the arrows ~,. A pair of finger3 3G
are arranged to project upwardly through slots 38 and 40 formed in the platform 34 and table 32 respectively. The finse~s 36 are mounted to be reciprocally driven in the direction of the arrows B toward and away from a back stop plate 40. ~ pair of pressure pads 42 are positioned above the~ ta~le 32 and platform 34 respectively and are mounted on reci~rocating drive units 44 so a-. to be recipro-cally driven toward and away from the table 32 and platform 34 respectively in the direction of the arrow C. A high frequency glue head 46 is lacated above the platform 34 so as to dlrect high frequency energy to the scæf joint in use.
In use, a flawless length 12b may be located on the table 32 and a fla~less length l~a may be located on the platform 34 with their scarf joint faces 18 and 20 positioned adjacent one another, preferably in a simple abutting relationship. The various cla7,nping necllanisms are then activated to engage the flawless portions 12a and 12b and to move them toward one another to firmly clamp the scarf faces 18 and 20 against one anotller. The high frequency gluing machine is then activated to form the required bond. Thereafter the rip is removed and a further joint made at the second set ~ ;
of sash joint faces.
~ 3~
:~; From the foregoing it will be apparent that the present invention provides a simple and efficient metilod of convertin~ a longitudinally elonqated mouldins rip havin~ a ~ortion contai.ning a flaw into a flawless premium lengtil mouldins.
.
~` ','' :. ,.
;,. -:
.`, , . ~.
:~ ~ ~ ~ '' '''; ~.
~ i ~, .~ .
~ '' .
Claims (2)
1. A method of converting a longitudinally elongated moulding rip having a portion containing a flaw such as a knot which is unacceptable in clear grade mouldings, into a substantially flawless premium length clear grade moulding, the rip having first and second flawless portions of substantially matching grain and a length less than a premium length, on either side of tile portion containing the flaw, comprising the steps of;
(a) cutting said rip transversely of its longitudinally elongated extent at both ends of the portion containing the flaw to provide smooth complementary first and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, (b) removing the portion containing the flaw from between said first and second scarf joint faces, (c) bonding said first and second scarf joint faces of said first and second flawless portions to one another to form a scarf joint connecting said first and second flawless portions to form a rip having a premium length, (d) working the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
(a) cutting said rip transversely of its longitudinally elongated extent at both ends of the portion containing the flaw to provide smooth complementary first and second scarf joint faces on the ends of the first and second flawless portions respectively disposed adjacent the portion containing the flaw, (b) removing the portion containing the flaw from between said first and second scarf joint faces, (c) bonding said first and second scarf joint faces of said first and second flawless portions to one another to form a scarf joint connecting said first and second flawless portions to form a rip having a premium length, (d) working the rip to produce a profiled moulding having a substantially flawless clear grade surface finish.
2. A method as claimed in Claim 1 wherein the transverse cut which is formed in the rip is angularly inclined with respect to the transverse extent of the rip to provide a greater surface area for bonding than would be available from a cut which extends parallel to the transverse extent of the rip.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA321,660A CA1087498A (en) | 1979-02-16 | 1979-02-16 | Method and apparatus for manufacturing wood mouldings |
| US06/013,897 US4236557A (en) | 1979-02-16 | 1979-02-22 | Method for manufacturing wood mouldings |
| GB7936826A GB2042416B (en) | 1979-02-16 | 1979-10-24 | Method and apparatus for manufacturing wood mouldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA321,660A CA1087498A (en) | 1979-02-16 | 1979-02-16 | Method and apparatus for manufacturing wood mouldings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1087498A true CA1087498A (en) | 1980-10-14 |
Family
ID=4113562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA321,660A Expired CA1087498A (en) | 1979-02-16 | 1979-02-16 | Method and apparatus for manufacturing wood mouldings |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1087498A (en) |
-
1979
- 1979-02-16 CA CA321,660A patent/CA1087498A/en not_active Expired
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