US20050229533A1 - Method of strengthening a wood piece - Google Patents
Method of strengthening a wood piece Download PDFInfo
- Publication number
- US20050229533A1 US20050229533A1 US11/061,306 US6130605A US2005229533A1 US 20050229533 A1 US20050229533 A1 US 20050229533A1 US 6130605 A US6130605 A US 6130605A US 2005229533 A1 US2005229533 A1 US 2005229533A1
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- Prior art keywords
- wood piece
- strengthening
- wood
- reinforcing member
- piece
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- 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
- B27M3/0006—Devices for fixing fittings into holes
-
- 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
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
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- 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
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
Definitions
- the present invention relates to a method of strengthening a wood piece by which, for example, a covering member for an industrial product may be obtained.
- a covering member for a device which is intended to be operated by a user while being held in his hand such as a camera, a portable telephone, an IC recorder, a PDA, a remote control for a household electronic product, or the like
- a covering member in consideration of the mechanical aspect such as formability, solidity and corrosion resistance, and in consideration of the design aspect such as quality of appearance and designability, and from the point of view of the demands made by industrial mass production, it is normal for such a covering member to be made generally of a material which is suitable for mass production, like a synthetic resin such as ABS, polycarbonate, acryl or the like or a light metal such as aluminum, stainless steel, titanium, magnesium or the like.
- a material such as a synthetic resin or a light metal is subject to the deficiency that, it may not be satisfactorily gripped by the human hand, since it does not absorb moisture.
- a natural material such as wood or bamboo or the like is endowed with an excellent feeling which appeals to the human sense of touch, since it is excellent at absorbing moisture and is easily gripped in the hand.
- a method of strengthening a wood piece of the present invention comprising the steps of: superimposing the wood piece upon a metallic reinforcing member; and compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
- a direction along which the reinforcing member extends and a direction of the grain of the wood piece cross one another.
- the reinforcing member is made in the form of a grating or a net.
- a step of forming a carbonized layer upon the surface of the wood piece where the reinforcing member is provided it is preferable that a step of forming a carbonized layer upon the surface of the wood piece where the reinforcing member is provided.
- the reinforcing member is quenched.
- a method of strengthening a wood piece of the present invention comprising the steps of: making a high density portion of the wood piece thin, and a low density portion of the wood piece thick; and compressing the wood piece having the high density portion and the low density portion.
- a method of strengthening a wood piece of the present invention comprising the steps of: making a portion of the wood piece at which high strength must be ensured thicker than a surrounding portion thereof; and compressing the wood piece having the portion at which the high strength must be ensured.
- a method of strengthening a wood piece of the present invention comprising the steps of: adhering another wood piece to a portion of the wood piece at which high strength must be ensured; and compressing the wood piece to which the another wood piece has been adhered.
- the direction of the grain of the wood piece and the direction of the grain of the another wood piece are different.
- a method of strengthening a wood piece of the present invention comprising the steps of: disposing a reinforcing member which is harder than the wood piece on a portion of the wood piece at which the high strength must be ensured; and compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
- FIG. 1 is a figure for explanation of the first preferred embodiment of the present invention, and is a perspective view showing a wood piece which is to be strengthened, and several rod shaped members made of metal, which is the reinforcing member.
- FIG. 2 through FIG. 5 are explanatory figures showing certain situations during the process of strengthening the wood piece.
- FIG. 6 is a perspective view showing a wood piece which has been compressed and strengthened with reinforcing member.
- FIG. 7 is a figure showing a variant example of this preferred embodiment of the present invention, and is a perspective view showing a wood piece which utilizes a net made of metal as a reinforcing member.
- FIG. 8 is a figure for explanation of the second preferred embodiment of the present invention, and is a cross sectional view showing a wood piece which is to be compressed, and upper and lower molds for compressing the wood piece.
- FIG. 9 is a figure for explanation of the second preferred embodiment of the present invention, and is a cross sectional view showing the situation where a wood piece has been compressed by the upper and lower molds.
- FIG. 10 is a cross sectional view showing a wood piece which has been compressed and strengthened with reinforcing material.
- FIG. 11 is a figure for explanation of the third preferred embodiment of the present invention, and is a cross sectional view showing a wood piece which has been integrated into reinforcing member and upon whose surface a carbonized layer has been formed.
- FIG. 12 is a figure for explanation of the fourth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece whose thickness has been made to vary according to the density of its grain.
- FIG. 13 is a figure for explanation of the fourth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece when it has been compressed and strengthened.
- FIG. 14 is a figure for explanation of the fifth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece of which a portion for which high strength must be ensured has been made thicker than its surroundings.
- FIG. 15 is a figure for explanation of the fifth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece strengthened by compressing the wood piece which includes a portion made thicker than its surroundings.
- FIG. 16 is a figure for explanation of the sixth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece to which, at a portion for which high strength must be ensured, another wedge of wood has been adhered.
- FIG. 17 is a figure for explanation of the sixth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece when it has been compressed and strengthened.
- FIG. 18 is a figure for explanation of the seventh preferred embodiment of the present invention, and is a perspective view showing a separate member which is adhered to a portion of a wood piece for which high strength must be ensured.
- FIG. 19 is a cross sectional view showing a wood piece to which another member has been adhered at a portion for which high strength must be ensured.
- FIG. 20 is a cross sectional view showing the wood piece which has been strengthened by this another member.
- FIG. 1 there are shown a wood piece 1 which is to be strengthened, and several rod shaped members (reinforcing member) 2 made of metal, which are for strengthening the wood piece 1 .
- This wood piece 1 is formed in a rectangular plate shape of approximately even thickness, and it is cut so that its grain faces in its lengthwise direction.
- the rod shaped members 2 are shaped as rods which are triangular in cross section, are divided into several sections of substantially equal dimensions to the width of the wood piece 1 .
- the type for the wood piece 1 there may be suggested, for example, Japanese cypress, paulownia, teak, mahogany, cedar, pine, cherry, bamboo or the like. Furthermore it is possible to utilize, not only proper wood, but also a wooden substance like a material made by compressing waste wood chips or wood sawdust or the like.
- the wood piece 1 is put into a steam atmosphere at high temperature and pressure.
- the wood piece 1 absorbs an excess water component by being thus placed in a steam atmosphere at high temperature and pressure, and accordingly softens.
- the rod shaped members are disposed inside the lower mold A in parallel with one another and with equal spaces being left between them, and the wood piece 1 is laid over these rod shaped members 2 so that its widthwise direction agrees with the lengthwise direction of the rod shaped members 2 .
- Each of the rod shaped members 2 thus comes to be disposed in a direction which is across the grain of the wood piece 1 .
- the upper mold B is shifted so as to be fitted into the interior of the lower mold A, so that the wood piece 1 is compressed between the upper and lower molds A and B, and this state is maintained for a predetermined time period.
- the rod shaped members 2 are pressed into the wood piece 1 which has been sandwiched between the upper and lower molds A and B, so that the sharp angle portions of the triangular shape are stuck into the lower surface of the wood piece 1 .
- the wood piece 1 which has been strengthened in the above described manner takes the form as shown in FIG. 6 .
- This wood piece 1 a greater strength is obtained than in the case of a wood piece that has simply been compressed, since the rod shaped members 2 have been integrated into it by compression.
- FIG. 7 shows a variant example of this first preferred embodiment.
- a net 3 made of metal is used as the reinforcing member in this wood piece 1 .
- This net 3 is made of a plurality of metal wires 3 a which extend in two directions which are almost mutually perpendicular, and, with respect to the wood piece 1 , these metal wires 3 a that extend in each direction are arranged so as to cross the grain of the wood piece 1 , respectively.
- the wood piece 1 of this second preferred embodiment is not simply shaped as a flat plate, but rather is in a box shape, as shown in FIG. 8 .
- this wood piece 1 is processed by cutting off portions from a block shaped wood, so that it consists of a bottom portion 1 a which is connected by smooth curved surfaces to side wall portions 1 b .
- the grain of this wood piece 1 extends in the lengthwise direction of the bottom portion 1 a , and, at the periphery of wall portions 1 b , it faces in the thickness direction of the wall portions 1 b.
- the wood piece 1 is put into a steam atmosphere at high temperature and pressure.
- the wood piece 1 absorbs an excess water component by being thus placed in a steam atmosphere at high temperature and pressure, and accordingly softens.
- the wood piece 1 is placed into the lower mold A, and the net 3 made of metal is placed upon the inner bottom portion of the wood piece 1 .
- the net 3 is curved beforehand so as to agree with the shape of the wood piece 1 .
- the upper mold B is shifted so as to be fitted into the interior of the lower mold A, so that the wood piece 1 is compressed between the upper and lower molds A and B, and this state is maintained for a predetermined time period.
- the net 3 is pressed into the upper surface of the wood piece 1 which has been sandwiched between the upper and lower molds A and B, and furthermore compression force is applied to the bottom portion 1 a and the wall portion 1 b of the wood piece 1 , so that it is compressed to be of thickness from about 1 ⁇ 2 to about 1 ⁇ 3 of its original.
- the wood piece 1 is formed in the shape of the internal space which is defined when the molds A and B are fitted together, and the net 3 is integrated into the upper surface of the wood piece 1 which has thus been formed, in the state of being embedded in the upper surface of the wood piece 1 .
- the bottom portion 1 a and the wall portion 1 b of the wood piece 1 are of almost the same thickness as one another.
- the wood piece 1 which has been strengthened in the above described manner takes the form as shown in FIG. 10 .
- this wood piece 1 in addition to the fact that a high strength is imparted by integrating the net 3 which is made of metal into it by compression, also, since the grain of the wall portion 1 b is bent around into the vertical direction which contributes to the strength of the wall portion 1 b , accordingly it is possible to enhance the strength of the wall portion 1 b up to the same level as that of the other portions of the wood piece 1 .
- wood piece 1 of this preferred embodiment after it has been strengthened by the process which has been explained above with respect to the first preferred embodiment, at its surface where the rod shaped members 2 are provided, a carbonized layer 4 of almost uniform thickness is formed.
- wood is originally a good insulator, it may be converted into a good conductor by being carbonized, and it then exhibits characteristics which are the same as or superior to those of a metal, and moreover this wood piece 1 is extremely effective as a covering member for, for example, an electronic device, since, it becomes a electromagnetic shielding material which is remarkably light in weight, in comparison with a metal.
- this carbonized layer 4 may be formed by burning one side of the wood piece 1
- deformation may occur if only one side of the wood piece 1 is burned, since the portion which has been burned shrinks, so that a dimensional discrepancy arises vis a vis the other side.
- it is effective to burn one side of the wood piece 1 , while drying out the water component which is included in the other side thereof by heating the other side up to the temperature which is required for evaporating the water component, and then both sides of the wood piece 1 shrink together, so that the occurrence of deformation is avoided.
- the wood piece 1 of this fifth preferred embodiment is intended to be used as a casing for a piece of electronic equipment, say a camera, and a hole 1 c is formed through it for, for example, exposing a release button (not shown in the figures). And in the state of this wood piece 1 before it is compressed, as shown in FIG. 14 , a portion thereof around the edge or the like of this hole 1 c (denoted by III in the figure), for which it is required to ensure high strength, is formed to be thicker than portions which surround it.
- the resulting reinforced wood piece 1 comes to be formed in a plate shape of almost uniform thickness as shown in FIG. 15 , and a relatively high strength is ensured for the portion III which originally was formed thicker than its surroundings, since the compression ratio of this portion III is higher, as compared to the compression ratio of its surroundings.
- the wood piece 1 of this sixth preferred embodiment is intended to be used as a casing for a piece of electronic equipment, so that a hole 1 c is formed through it. And in the state of this wood piece 1 before it is compressed, as shown in FIG. 16 , to a portion thereof around the edge or the like of this hole 1 c (denoted by IV in the figure) for which it is required to ensure high strength, there is adhered another wood piece 5 which is formed in a circular wedge shape.
- the resulting reinforced wood piece 1 comes to be formed in a plate shape of almost uniform thickness as shown in FIG. 17 , and a relatively high strength is ensured for the portion IV to which the wedge shaped wood piece 5 was adhered before the compression process, since the compression ratio of this portion IV is higher, as compared to the compression ratio of its surroundings.
- this sixth preferred embodiment it is desirable to arrange for the grain of the main wood piece 1 and the grain of the supplementary wood piece 5 to be almost perpendicular to one another. By doing this, it is possible to ensure even higher strength for the resulting product, since these two pieces of wood mutually reinforce one another in their respective directions where they are each weakest.
- the wood piece 1 of this seventh preferred embodiment is intended to be used as a casing for a piece of electronic equipment, so that a hole 1 c is formed through it. And in the state of this wood piece 1 before it is compressed, as shown in FIG. 19 , at a portion thereof around the edge or the like of this hole 1 c (denoted by V in the figure) for which it is required to ensure high strength, there is positioned another member 6 which is made of a substance which is harder than wood (for example, a metal, a ceramic, or a reinforced plastic). The shape of this other member 6 is as shown in FIG.
- the resulting reinforced wood piece 1 with the embedded member 6 comes to be formed in a plate shape of almost uniform thickness as shown in FIG. 20 , and a relatively high strength is ensured for the portion V into which the other member 6 is embedded, since, along with the portion V being reinforced with the other member 6 , also the compression ratio of this portion V against which the other member 6 has been positioned is higher, as compared to the compression ratio of its surroundings.
- this covering member is satisfactory from the point of view of the mechanical aspects such as formability, durability, corrosion resistance, and so on, and also is satisfactory from the point of view of the design aspects such as quality of appearance and designability and so on, accordingly it is very suitable as a covering member for a device which is intended to be operated by a user while being held in his hand, such as a camera, a portable telephone, an IC recorder, a PDA, a remote control of a household product, and the like.
Abstract
This method of strengthening a wood piece comprises the steps of: superimposing the wood piece upon a reinforcing member; and compressing the wood piece and the reinforcing member.
Description
- This application is continuation application of a PCT Application No. PCT/JP2004/017907, filed Nov. 25, 2004, entitled “METHOD OF STRENGTHENING A WOOD PIECE” whose priority is claimed on Japanese Patent Application No. 2003-396343, filed November 26, 2003. The content of both the PCT Application and Japanese Application is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a method of strengthening a wood piece by which, for example, a covering member for an industrial product may be obtained.
- 2. Description of Related Art
- With a covering member for a device which is intended to be operated by a user while being held in his hand, such as a camera, a portable telephone, an IC recorder, a PDA, a remote control for a household electronic product, or the like, in consideration of the mechanical aspect such as formability, solidity and corrosion resistance, and in consideration of the design aspect such as quality of appearance and designability, and from the point of view of the demands made by industrial mass production, it is normal for such a covering member to be made generally of a material which is suitable for mass production, like a synthetic resin such as ABS, polycarbonate, acryl or the like or a light metal such as aluminum, stainless steel, titanium, magnesium or the like.
- A material such as a synthetic resin or a light metal is subject to the deficiency that, it may not be satisfactorily gripped by the human hand, since it does not absorb moisture. On the other hand, a natural material such as wood or bamboo or the like is endowed with an excellent feeling which appeals to the human sense of touch, since it is excellent at absorbing moisture and is easily gripped in the hand.
- In the Japanese Examined Patent Application, Second Publication No, H07-2326, there is disclosed a technique in which, with the objective of strengthening a wooden material, first this wooden material is softened by placing it in an atmosphere of steam at high temperature and high pressure, and thereafter this wooden material is compressed mechanically under the same atmospheric conditions.
- Furthermore, in the Japanese Unexamined Patent Application, First Publication No, H11-226915, there is disclosed a technique in which, with the objective of forming a smooth ornamental pattern upon the surface of a wooden material, a cross-grained wooden member is softened with heat, and then its surface is smoothed by pressing.
- A method of strengthening a wood piece of the present invention, comprising the steps of: superimposing the wood piece upon a metallic reinforcing member; and compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
- In the above method of strengthening a wood piece of the present invention, it is preferable that a direction along which the reinforcing member extends and a direction of the grain of the wood piece cross one another.
- In the above method of strengthening a wood piece of the present invention, it is preferable that the reinforcing member is made in the form of a grating or a net.
- In the above method of strengthening a wood piece of the present invention, it is preferable that a step of forming a carbonized layer upon the surface of the wood piece where the reinforcing member is provided.
- In the above method of strengthening a wood piece of the present invention, it is preferable that the reinforcing member is quenched.
- A method of strengthening a wood piece of the present invention, comprising the steps of: making a high density portion of the wood piece thin, and a low density portion of the wood piece thick; and compressing the wood piece having the high density portion and the low density portion.
- A method of strengthening a wood piece of the present invention, comprising the steps of: making a portion of the wood piece at which high strength must be ensured thicker than a surrounding portion thereof; and compressing the wood piece having the portion at which the high strength must be ensured.
- A method of strengthening a wood piece of the present invention, comprising the steps of: adhering another wood piece to a portion of the wood piece at which high strength must be ensured; and compressing the wood piece to which the another wood piece has been adhered.
- In the above method of strengthening a wood piece of the present invention, it is preferable that the direction of the grain of the wood piece and the direction of the grain of the another wood piece are different.
- A method of strengthening a wood piece of the present invention, comprising the steps of: disposing a reinforcing member which is harder than the wood piece on a portion of the wood piece at which the high strength must be ensured; and compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
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FIG. 1 is a figure for explanation of the first preferred embodiment of the present invention, and is a perspective view showing a wood piece which is to be strengthened, and several rod shaped members made of metal, which is the reinforcing member. -
FIG. 2 throughFIG. 5 are explanatory figures showing certain situations during the process of strengthening the wood piece. -
FIG. 6 is a perspective view showing a wood piece which has been compressed and strengthened with reinforcing member. -
FIG. 7 is a figure showing a variant example of this preferred embodiment of the present invention, and is a perspective view showing a wood piece which utilizes a net made of metal as a reinforcing member. -
FIG. 8 is a figure for explanation of the second preferred embodiment of the present invention, and is a cross sectional view showing a wood piece which is to be compressed, and upper and lower molds for compressing the wood piece. -
FIG. 9 is a figure for explanation of the second preferred embodiment of the present invention, and is a cross sectional view showing the situation where a wood piece has been compressed by the upper and lower molds. -
FIG. 10 is a cross sectional view showing a wood piece which has been compressed and strengthened with reinforcing material. -
FIG. 11 is a figure for explanation of the third preferred embodiment of the present invention, and is a cross sectional view showing a wood piece which has been integrated into reinforcing member and upon whose surface a carbonized layer has been formed. -
FIG. 12 is a figure for explanation of the fourth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece whose thickness has been made to vary according to the density of its grain. -
FIG. 13 is a figure for explanation of the fourth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece when it has been compressed and strengthened. -
FIG. 14 is a figure for explanation of the fifth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece of which a portion for which high strength must be ensured has been made thicker than its surroundings. -
FIG. 15 is a figure for explanation of the fifth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece strengthened by compressing the wood piece which includes a portion made thicker than its surroundings. -
FIG. 16 is a figure for explanation of the sixth preferred embodiment of the present invention, and is a cross sectional view showing a wood piece to which, at a portion for which high strength must be ensured, another wedge of wood has been adhered. -
FIG. 17 is a figure for explanation of the sixth preferred embodiment of the present invention, and is a cross sectional view showing the wood piece when it has been compressed and strengthened. -
FIG. 18 is a figure for explanation of the seventh preferred embodiment of the present invention, and is a perspective view showing a separate member which is adhered to a portion of a wood piece for which high strength must be ensured. -
FIG. 19 is a cross sectional view showing a wood piece to which another member has been adhered at a portion for which high strength must be ensured. -
FIG. 20 is a cross sectional view showing the wood piece which has been strengthened by this another member. - The first preferred embodiment of the present invention will now be explained with reference to
FIG. 1 throughFIG. 7 . - In
FIG. 1 , there are shown awood piece 1 which is to be strengthened, and several rod shaped members (reinforcing member) 2 made of metal, which are for strengthening thewood piece 1. Thiswood piece 1 is formed in a rectangular plate shape of approximately even thickness, and it is cut so that its grain faces in its lengthwise direction. And the rod shapedmembers 2 are shaped as rods which are triangular in cross section, are divided into several sections of substantially equal dimensions to the width of thewood piece 1. - It should be understood that, as the type for the
wood piece 1, there may be suggested, for example, Japanese cypress, paulownia, teak, mahogany, cedar, pine, cherry, bamboo or the like. Furthermore it is possible to utilize, not only proper wood, but also a wooden substance like a material made by compressing waste wood chips or wood sawdust or the like. - Next, the various processes involved in reinforcing the
wood piece 1 will be explained with reference toFIG. 2 throughFIG. 5 . - First, as shown in
FIG. 2 , thewood piece 1 is put into a steam atmosphere at high temperature and pressure. Thewood piece 1 absorbs an excess water component by being thus placed in a steam atmosphere at high temperature and pressure, and accordingly softens. - Next, as shown in
FIG. 3 , still in a high temperature high pressure steam atmosphere the same as the one described above, the rod shaped members are disposed inside the lower mold A in parallel with one another and with equal spaces being left between them, and thewood piece 1 is laid over these rod shapedmembers 2 so that its widthwise direction agrees with the lengthwise direction of the rod shapedmembers 2. Each of the rod shapedmembers 2 thus comes to be disposed in a direction which is across the grain of thewood piece 1. - Next, as shown in
FIG. 4 , the upper mold B is shifted so as to be fitted into the interior of the lower mold A, so that thewood piece 1 is compressed between the upper and lower molds A and B, and this state is maintained for a predetermined time period. The rod shapedmembers 2 are pressed into thewood piece 1 which has been sandwiched between the upper and lower molds A and B, so that the sharp angle portions of the triangular shape are stuck into the lower surface of thewood piece 1. - Finally, as shown in
FIG. 5 , when the high temperature high pressure steam atmosphere is released and thewood piece 1 is taken out from between the upper and lower molds A and B, thewood piece 1 is formed in the shape of the internal space which is defined when the molds A and B are fitted together, and the rod shapedmembers 2 are integrated into thewood piece 1 which has thus been formed, in the state of being embedded in the lower surface of thewood piece 1. - The
wood piece 1 which has been strengthened in the above described manner takes the form as shown inFIG. 6 . With thiswood piece 1, a greater strength is obtained than in the case of a wood piece that has simply been compressed, since the rod shapedmembers 2 have been integrated into it by compression. - Furthermore, with this
wood piece 1 which has been strengthened with the rod shapedmembers 2, the workability is also enhanced, because the rod shapedmembers 2 are able to be plastically deformed. - Yet further, by arranging the rod shaped
members 2 so as to cross the grain of thewood piece 1, it becomes difficult for splitting of thewood piece 1 to occur, even if shearing force acts on it in a vertical direction. -
FIG. 7 shows a variant example of this first preferred embodiment. - A net 3 made of metal is used as the reinforcing member in this
wood piece 1. This net 3 is made of a plurality ofmetal wires 3a which extend in two directions which are almost mutually perpendicular, and, with respect to thewood piece 1, thesemetal wires 3 a that extend in each direction are arranged so as to cross the grain of thewood piece 1, respectively. - Since, with this
wood piece 1 which utilizes the net 3 made of metal as its reinforcing member, thenet 3 reinforces thewood piece 1 over a whole surface which is formed as a sheet, accordingly the surface rigidity of thewood piece 1 is enhanced. It should be understood that the same beneficial results would also be obtained from a grating formed by metal punching or the like, instead of the net 3 made of metal. - In this preferred embodiment of the present invention, it may be contemplated enhancing the strength by hardening of the metal, by quenching the metallic rod shaped
members 2 or thenet 3. - Next, the second preferred embodiment of the present invention will be explained with reference to
FIG. 8 throughFIG. 10 . It should be understood that to structural elements which are the same as in the above described first preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - The
wood piece 1 of this second preferred embodiment is not simply shaped as a flat plate, but rather is in a box shape, as shown inFIG. 8 . Before it is strengthened, thiswood piece 1 is processed by cutting off portions from a block shaped wood, so that it consists of abottom portion 1 a which is connected by smooth curved surfaces toside wall portions 1 b. The grain of thiswood piece 1 extends in the lengthwise direction of thebottom portion 1 a, and, at the periphery ofwall portions 1 b, it faces in the thickness direction of thewall portions 1 b. - Next, the various processes involved in strengthening of the
wood piece 1 will be explained. - First, the
wood piece 1 is put into a steam atmosphere at high temperature and pressure. Thewood piece 1 absorbs an excess water component by being thus placed in a steam atmosphere at high temperature and pressure, and accordingly softens. - Next, as shown in
FIG. 8 , still in the same high temperature high pressure steam atmosphere as the one described above, thewood piece 1 is placed into the lower mold A, and the net 3 made of metal is placed upon the inner bottom portion of thewood piece 1. The net 3 is curved beforehand so as to agree with the shape of thewood piece 1. - Here, the relationship between the shape of the lower surface of the wood piece 1 (its outer aspect) and the shape of the lower mold A, and the relationship between the shape of the upper surface of the wood piece 1 (its inner aspect) and the shape of the upper mold B will be explained. As described above, smooth curved surfaces extend from the
bottom portion 1 a of thewood piece 1 to itswall portion 1 b when the radius of curvature of the curved surface of the lower surface of the wood piece 1 (its outer aspect) is termed Ro, the radius of curvature of the curved surface of the upper surface of the wood piece 1 (its inner aspect) is termed Ri, the radius of curvature of the curved surface of the lower mold A which contacts the curved surface of radius of curvature Ro upon thewood piece 1 is termed RA, and the radius of curvature of the curved surface of the upper mold B which contacts the curved surface of radius of curvature Ri upon thewood piece 1 is termed RB, then the relationships Ro>RA and Ri>RB hold between these values. - Next, as shown in
FIG. 9 , the upper mold B is shifted so as to be fitted into the interior of the lower mold A, so that thewood piece 1 is compressed between the upper and lower molds A and B, and this state is maintained for a predetermined time period. The net 3 is pressed into the upper surface of thewood piece 1 which has been sandwiched between the upper and lower molds A and B, and furthermore compression force is applied to thebottom portion 1 a and thewall portion 1 b of thewood piece 1, so that it is compressed to be of thickness from about ½ to about ⅓ of its original. - At this time since, due to the above described relationship between the radii of curvature, at the
wall portion 1 b, the compression force does not act in the direction of the grain of the wood, but rather, on the outside, a frictional force in the upward direction acts so as to shear the outer aspect of thewall portion 1 b in the upward direction, while, on the inside, a frictional force in the downward direction acts so as to shear the inner aspect of thewall portion 1 b in the downward direction, accordingly the grain of thewall portion 1 b, which originally was oriented in a horizontal direction, is deformed so as to be bent in the vertical direction. - Finally, when the high temperature high pressure steam atmosphere is released and the
wood piece 1 is taken out from between the upper and lower molds A and B, thewood piece 1 is formed in the shape of the internal space which is defined when the molds A and B are fitted together, and the net 3 is integrated into the upper surface of thewood piece 1 which has thus been formed, in the state of being embedded in the upper surface of thewood piece 1. After having thus been compressed, thebottom portion 1 a and thewall portion 1 b of thewood piece 1 are of almost the same thickness as one another. - The
wood piece 1 which has been strengthened in the above described manner takes the form as shown inFIG. 10 . With thiswood piece 1, in addition to the fact that a high strength is imparted by integrating the net 3 which is made of metal into it by compression, also, since the grain of thewall portion 1 b is bent around into the vertical direction which contributes to the strength of thewall portion 1 b, accordingly it is possible to enhance the strength of thewall portion 1 b up to the same level as that of the other portions of thewood piece 1. - Next, the third preferred embodiment of the present invention will be explained with reference to
FIG. 11 . It should be understood that to structural elements which are the same as in the above described preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - With the
wood piece 1 of this preferred embodiment, after it has been strengthened by the process which has been explained above with respect to the first preferred embodiment, at its surface where the rod shapedmembers 2 are provided, acarbonized layer 4 of almost uniform thickness is formed. Although wood is originally a good insulator, it may be converted into a good conductor by being carbonized, and it then exhibits characteristics which are the same as or superior to those of a metal, and moreover thiswood piece 1 is extremely effective as a covering member for, for example, an electronic device, since, it becomes a electromagnetic shielding material which is remarkably light in weight, in comparison with a metal. - It should be understood that, while this
carbonized layer 4 may be formed by burning one side of thewood piece 1, it should also be considered that deformation may occur if only one side of thewood piece 1 is burned, since the portion which has been burned shrinks, so that a dimensional discrepancy arises vis a vis the other side. To address this problem, it is effective to burn one side of thewood piece 1, while drying out the water component which is included in the other side thereof by heating the other side up to the temperature which is required for evaporating the water component, and then both sides of thewood piece 1 shrink together, so that the occurrence of deformation is avoided. - Next, the fourth preferred embodiment of the present invention will be explained with reference to
FIG. 12 andFIG. 13 . It should be understood that to structural elements which are the same as in the above described preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - With the
wood piece 1 of this fourth preferred embodiment, in its state before being compressed, as shown inFIG. 12 , a portion which is of high density (denoted by I in the figure) is made to be thin, while a portion which is of low density (denoted by II in the figure) is made to be thick. When awood piece 1 with such shape is strengthened according to the process which has been explained with reference to the above described first preferred embodiment, the resulting reinforcedwood piece 1 comes to be formed in a plate shape of almost uniform thickness as shown inFIG. 13 , and the compression ratio of the portion which originally had a high density is lower, while the compression ratio of the portion which originally had a low density is higher, so that, considering thewood piece 1 after compression as a whole, it has an almost uniform strength, since its density after compression is almost uniform. - Next, the fifth preferred embodiment of the present invention will be explained with reference to
FIG. 14 andFIG. 15 . It should be understood that to structural elements which are the same as in the above described preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - The
wood piece 1 of this fifth preferred embodiment is intended to be used as a casing for a piece of electronic equipment, say a camera, and ahole 1 c is formed through it for, for example, exposing a release button (not shown in the figures). And in the state of thiswood piece 1 before it is compressed, as shown inFIG. 14 , a portion thereof around the edge or the like of thishole 1 c (denoted by III in the figure), for which it is required to ensure high strength, is formed to be thicker than portions which surround it. When awood piece 1 with such shape is strengthened according to the process which has been explained with reference to the above described first preferred embodiment, the resulting reinforcedwood piece 1 comes to be formed in a plate shape of almost uniform thickness as shown inFIG. 15 , and a relatively high strength is ensured for the portion III which originally was formed thicker than its surroundings, since the compression ratio of this portion III is higher, as compared to the compression ratio of its surroundings. - Next, the sixth preferred embodiment of the present invention will be explained with reference to
FIG. 16 andFIG. 17 . It should be understood that to structural elements which are the same as in the above described preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - The
wood piece 1 of this sixth preferred embodiment, just like thewood piece 1 of the fifth preferred embodiment, is intended to be used as a casing for a piece of electronic equipment, so that ahole 1 c is formed through it. And in the state of thiswood piece 1 before it is compressed, as shown inFIG. 16 , to a portion thereof around the edge or the like of thishole 1 c (denoted by IV in the figure) for which it is required to ensure high strength, there is adhered anotherwood piece 5 which is formed in a circular wedge shape. When awood piece 1 with such structure is strengthened according to the process which has been explained with reference to the above described first preferred embodiment, the resulting reinforcedwood piece 1 comes to be formed in a plate shape of almost uniform thickness as shown inFIG. 17 , and a relatively high strength is ensured for the portion IV to which the wedge shapedwood piece 5 was adhered before the compression process, since the compression ratio of this portion IV is higher, as compared to the compression ratio of its surroundings. - In this sixth preferred embodiment, it is desirable to arrange for the grain of the
main wood piece 1 and the grain of thesupplementary wood piece 5 to be almost perpendicular to one another. By doing this, it is possible to ensure even higher strength for the resulting product, since these two pieces of wood mutually reinforce one another in their respective directions where they are each weakest. - Next, the seventh preferred embodiment of the present invention will be explained with reference to
FIG. 18 throughFIG. 20 . It should be understood that to structural elements which are the same as in the above described preferred embodiments and which have already been explained, the same reference symbols are appended, and their explanation will be curtailed. - The
wood piece 1 of this seventh preferred embodiment, just like thewood piece 1 of the fifth preferred embodiment, is intended to be used as a casing for a piece of electronic equipment, so that ahole 1 c is formed through it. And in the state of thiswood piece 1 before it is compressed, as shown inFIG. 19 , at a portion thereof around the edge or the like of thishole 1 c (denoted by V in the figure) for which it is required to ensure high strength, there is positioned anothermember 6 which is made of a substance which is harder than wood (for example, a metal, a ceramic, or a reinforced plastic). The shape of thisother member 6 is as shown inFIG. 18 , it is formed in a circular ring shape, with its portion around its inner peripheral surface being made the thickest, and with its thickness gradually diminishing towards its outer periphery. When awood piece 1 with such structure including theother member 6 is strengthened according to the process which has been explained with reference to the above described first preferred embodiment, the resulting reinforcedwood piece 1 with the embeddedmember 6 comes to be formed in a plate shape of almost uniform thickness as shown inFIG. 20 , and a relatively high strength is ensured for the portion V into which theother member 6 is embedded, since, along with the portion V being reinforced with theother member 6, also the compression ratio of this portion V against which theother member 6 has been positioned is higher, as compared to the compression ratio of its surroundings. - While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present invention. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims.
- Since this covering member is satisfactory from the point of view of the mechanical aspects such as formability, durability, corrosion resistance, and so on, and also is satisfactory from the point of view of the design aspects such as quality of appearance and designability and so on, accordingly it is very suitable as a covering member for a device which is intended to be operated by a user while being held in his hand, such as a camera, a portable telephone, an IC recorder, a PDA, a remote control of a household product, and the like.
Claims (10)
1. A method of strengthening a wood piece, comprising the steps of:
superimposing the wood piece upon a metallic reinforcing member; and
compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
2. A method of strengthening a wood piece according to claim 1 ,
wherein a direction along which the reinforcing member extends and a direction of the grain of the wood piece cross one another.
3. A method of strengthening a wood piece according to claim 1 ,
wherein the reinforcing member is made in the form of a grating or a net.
4. A method of strengthening a wood piece according to claim 1 , further comprising a step of:
forming a carbonized layer upon the surface of the wood piece where the reinforcing member is provided.
5. A method of strengthening a wood piece according to claim 1 ,
wherein the reinforcing member is quenched.
6. A method of strengthening a wood piece, comprising the steps of:
making a high density portion of the wood piece thin, and a low density portion of the wood piece thick; and
compressing the wood piece having the high density portion and the low density portion.
7. A method of strengthening a wood piece, comprising the steps of:
making a portion of the wood piece at which high strength must be ensured thicker than a surrounding portion thereof; and
compressing the wood piece having the portion at which the high strength must be ensured.
8. A method of strengthening a wood piece, comprising the steps of:
adhering another wood piece to a portion of the wood piece at which high strength must be ensured; and
compressing the wood piece to which the another wood piece has been adhered.
9. A method of strengthening a wood piece according to claim 8 ,
wherein the direction of the grain of the wood piece and the direction of the grain of the another wood piece are different.
10. A method of strengthening a wood piece, comprising the steps of:
disposing a reinforcing member which is harder than the wood piece on a portion of the wood piece at which the high strength must be ensured; and
compressing the wood piece and the reinforcing member, so that the wood piece and the reinforcing member are integrated.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003396343A JP2005153364A (en) | 2003-11-26 | 2003-11-26 | Wood reinforcing method |
JPP2003-396343 | 2003-11-26 | ||
PCT/JP2004/017907 WO2005051619A1 (en) | 2003-11-26 | 2004-11-25 | Method of strengthening a wood piece |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/017907 Continuation WO2005051619A1 (en) | 2003-11-26 | 2004-11-25 | Method of strengthening a wood piece |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050229533A1 true US20050229533A1 (en) | 2005-10-20 |
Family
ID=34631513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/061,306 Abandoned US20050229533A1 (en) | 2003-11-26 | 2005-02-18 | Method of strengthening a wood piece |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050229533A1 (en) |
EP (1) | EP1689568A1 (en) |
JP (1) | JP2005153364A (en) |
CN (1) | CN1886240A (en) |
WO (1) | WO2005051619A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120018047A1 (en) * | 2009-04-02 | 2012-01-26 | Olympus Corporation | Method of forming wooden piece |
US20120018046A1 (en) * | 2009-04-02 | 2012-01-26 | Olympus Corporation | Method of manufacturing compressed wood product |
US20230044042A1 (en) * | 2021-08-04 | 2023-02-09 | Hyundai Mobis Co., Ltd. | Wood preforming device for manufacturing crash pad for vehicle including real wood sheet |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4225884B2 (en) * | 2003-12-08 | 2009-02-18 | オリンパス株式会社 | Electronics |
EP1943068A1 (en) | 2005-09-29 | 2008-07-16 | Olympus Corporation | Method of processing wood and compressed wood product |
CN103056947A (en) * | 2011-10-19 | 2013-04-24 | 马伊伍德斯株式会社 | Plastic processed timber and manufacturing method thereof |
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- 2004-11-25 WO PCT/JP2004/017907 patent/WO2005051619A1/en not_active Application Discontinuation
- 2004-11-25 CN CNA2004800346625A patent/CN1886240A/en active Pending
- 2004-11-25 EP EP04799903A patent/EP1689568A1/en not_active Withdrawn
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US20120018046A1 (en) * | 2009-04-02 | 2012-01-26 | Olympus Corporation | Method of manufacturing compressed wood product |
US20230044042A1 (en) * | 2021-08-04 | 2023-02-09 | Hyundai Mobis Co., Ltd. | Wood preforming device for manufacturing crash pad for vehicle including real wood sheet |
Also Published As
Publication number | Publication date |
---|---|
JP2005153364A (en) | 2005-06-16 |
WO2005051619A1 (en) | 2005-06-09 |
CN1886240A (en) | 2006-12-27 |
EP1689568A1 (en) | 2006-08-16 |
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Owner name: OLYMPUS CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUZUKI, TATSUYA;REEL/FRAME:016600/0184 Effective date: 20050222 |
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