CA2138867C - Stairtread made of a combination of high quality wood and low quality material - Google Patents
Stairtread made of a combination of high quality wood and low quality material Download PDFInfo
- Publication number
- CA2138867C CA2138867C CA 2138867 CA2138867A CA2138867C CA 2138867 C CA2138867 C CA 2138867C CA 2138867 CA2138867 CA 2138867 CA 2138867 A CA2138867 A CA 2138867A CA 2138867 C CA2138867 C CA 2138867C
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- Prior art keywords
- elongate
- stairtread
- lamellas
- high quality
- core
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/04—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
- E04F15/048—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members with a top surface of assembled elongated wooden strip type
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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
- B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
- B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
- B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue
-
- 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
- B27M3/12—Manufacture or reconditioning of specific semi-finished or finished articles of railings, stairs, stair stringers, ladders, or parts thereof
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/104—Treads
- E04F11/1045—Treads composed of several layers, e.g. sandwich panels
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/104—Treads
- E04F11/108—Treads of wood or with an upper layer of wood
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Forests & Forestry (AREA)
- Steps, Ramps, And Handrails (AREA)
Abstract
The wooden stairtread has the aesthetic appearance of a solid wood stairtread and presents a structural stability comparable to that of wood treads, but comprises a core layer consisting of lamellas of low quality material glued laterally adjacent to each other. On the top surface of the core layer are glued laterally adjacent to each other top lamellas of high quality wood. Underneath lamellas consisting of high quality wood may also be glued laterally adjacent to each other on the bottom surface of the core layer to form a tread of which the underside is made of high quality wood covering the low quality core. Finally an elongate nose member is applied and glued to a longitudinal edge surface of the core layer.
Use of low quality material such as low quality wood helps to preserve our natural resources and to reduce consumption of high quality wood material becoming every day more rare and difficult to obtain.
Use of low quality material such as low quality wood helps to preserve our natural resources and to reduce consumption of high quality wood material becoming every day more rare and difficult to obtain.
Description
S STAIRTREAD MADE OF A COMBINATION OF HIGH QUALITY WOOD AND
LOW QUALITY MATERIAL
BACKGROUND OF THE INVENTION
1. Field of the invention:
The present invention relates to a stairtread comprising a core layer consisting of low quality material, in particular but not exclusively low quality wood, and a top layer and nose member made of solid high quality wood.
LOW QUALITY MATERIAL
BACKGROUND OF THE INVENTION
1. Field of the invention:
The present invention relates to a stairtread comprising a core layer consisting of low quality material, in particular but not exclusively low quality wood, and a top layer and nose member made of solid high quality wood.
2. Brief description of the prior art:
Conventional wooden stairtreads are made of elongate wooden lamellas each made of a single solid piece of high quality wood, these elongate wooden lamellas being assembled, i.e. glued laterally adjacent to each other to form the tread.
This structure has the drawback of requiring a large quantity of high quality wood.
In the present disclosure and in the appended claims, the expression "high quality wood" is intended to designate wood of sufficient quality to be used in making the elongate wooden lamellas of conventional wooden treads, while the expression "low quality wood" relates to wood of insufficient quality and usually discarded upon manufacture of conventional wooden treads. Regarding the expression "low quality material" it includes low quality wood and secondary materials such as medium or high density fibre materials.
OBJECTS OF THE INVENTION
An object of the present invention is therefore to provide a stairtread having the aesthetic appearance of a solid wood stairtread and presenting a structural stability comparable to that of conventional wood treads, but having a core layer composed of low quality material, in particular but not exclusively low quality wood usually disposed of. Accordingly, low quality wood normally discarded finds application in the stairtread of the invention to help to preserve our natural resources and to reduce consumption of high quality wood material becoming every day more rare and difficult to obtain.
SUMMARY OF THE INVENTION
More specifically, in accordance with the present invention, there is provided a stairtread comprising an elongate nose member consisting of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose, and an elongate tread body comprising a core layer having a top face and a top layer having a bottom face applied and glued to the top face of the core layer. The core layer is made of a plurality of elongate thick lamellas made of low quality material and glued laterally adjacent to each other, the top layer is made of a plurality of elongate thin lamellas made of high quality wood and glued laterally adjacent to each other, the tread body comprises a longitudinal edge surface applied and glued to the first longitudinal edge surface of the nose member, and the top layer and nose member define high quality wooden and apparent top and nose surfaces of the stairtread.
Preferably, the first elongate thick lamellas of the core layer are made of low quality wood, at least one of the elongate thick lamellas of the core layer comprises a plurality of sections of low quality wood assembled end to end, the elongate nose member and each elongate thin lamella of the top layer is made of a single solid piece of high quality wood.
Conventional wooden stairtreads are made of elongate wooden lamellas each made of a single solid piece of high quality wood, these elongate wooden lamellas being assembled, i.e. glued laterally adjacent to each other to form the tread.
This structure has the drawback of requiring a large quantity of high quality wood.
In the present disclosure and in the appended claims, the expression "high quality wood" is intended to designate wood of sufficient quality to be used in making the elongate wooden lamellas of conventional wooden treads, while the expression "low quality wood" relates to wood of insufficient quality and usually discarded upon manufacture of conventional wooden treads. Regarding the expression "low quality material" it includes low quality wood and secondary materials such as medium or high density fibre materials.
OBJECTS OF THE INVENTION
An object of the present invention is therefore to provide a stairtread having the aesthetic appearance of a solid wood stairtread and presenting a structural stability comparable to that of conventional wood treads, but having a core layer composed of low quality material, in particular but not exclusively low quality wood usually disposed of. Accordingly, low quality wood normally discarded finds application in the stairtread of the invention to help to preserve our natural resources and to reduce consumption of high quality wood material becoming every day more rare and difficult to obtain.
SUMMARY OF THE INVENTION
More specifically, in accordance with the present invention, there is provided a stairtread comprising an elongate nose member consisting of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose, and an elongate tread body comprising a core layer having a top face and a top layer having a bottom face applied and glued to the top face of the core layer. The core layer is made of a plurality of elongate thick lamellas made of low quality material and glued laterally adjacent to each other, the top layer is made of a plurality of elongate thin lamellas made of high quality wood and glued laterally adjacent to each other, the tread body comprises a longitudinal edge surface applied and glued to the first longitudinal edge surface of the nose member, and the top layer and nose member define high quality wooden and apparent top and nose surfaces of the stairtread.
Preferably, the first elongate thick lamellas of the core layer are made of low quality wood, at least one of the elongate thick lamellas of the core layer comprises a plurality of sections of low quality wood assembled end to end, the elongate nose member and each elongate thin lamella of the top layer is made of a single solid piece of high quality wood.
According to other preferred embodiments, the stairtread further comprises a bottom layer made of high quality wood and having a top face applied and glued to the bottom face of the elongate tread body, and the bottom layer comprises a plurality of laterally adjacent thin elongate lamellas each cut in a single solid piece of high quality wood.
Also in accordance with the present invention, there is provided a method of fabricating a stairtread, comprising the steps of:
- making an elongate nose member made of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose;
- making elongate thicker core lamellas of low quality material;
- making elongate top lamellas of high quality wood having respective bottom faces;
- gluing the elongate thicker core lamellas laterally adjacent to each other to form an elongate core layer of low quality material having a top face;
- assembling the elongate thin lamellas to form an elongate top layer of high quality wood, the assembling step comprising gluing the elongate thin top lamellas laterally adjacent to each other and gluing the bottom faces of the top lamellas to the top face of the core layer;
and - applying and gluing the first longitudinal edge surf ace of the nose member to a longitudinal edge surface of the core body.
Also in accordance with the present invention, there is provided a method of fabricating a stairtread, comprising the steps of:
- making an elongate nose member made of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose;
- making elongate thicker core lamellas of low quality material;
- making elongate top lamellas of high quality wood having respective bottom faces;
- gluing the elongate thicker core lamellas laterally adjacent to each other to form an elongate core layer of low quality material having a top face;
- assembling the elongate thin lamellas to form an elongate top layer of high quality wood, the assembling step comprising gluing the elongate thin top lamellas laterally adjacent to each other and gluing the bottom faces of the top lamellas to the top face of the core layer;
and - applying and gluing the first longitudinal edge surf ace of the nose member to a longitudinal edge surface of the core body.
Therefore, the top layer and nose member define high quality wooden apparent top and nose surfaces of the stairtread.
The present invention further relates to a stairtread comprising a plurality of elongate members assembled laterally adjacent to each other, each of the elongate members comprising a core lamella made of low quality material and having a top face. Each elongate member also comprises a top lamella made of high quality wood and having a bottom face applied and glued to the top face of the core lamella. Also, each pair of laterally adjacent elongate members have respective edge surfaces applied and glued to each other, the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and the core lamellas of the laterally adjacent elongate members define a low quality, non apparent bottom surface of the stairtread.
According to another aspect of the subject invention, there is provided a method of fabricating a stairtread, comprising the steps of:
- making elongate core lamellas of low quality material having respective top faces;
- making elongate top lamellas of high quality wood having respective bottom faces;
- applying and gluing the bottom faces of the top lamellas to the top faces of the core lamellas, respectively, to form elongate members;
and - assembling the elongate members laterally adjacent to each other, the assembling step comprising applying and gluing to each other respective edge surfaces of each pair of laterally adjacent elongate members.
The present invention further relates to a stairtread comprising a plurality of elongate members assembled laterally adjacent to each other, each of the elongate members comprising a core lamella made of low quality material and having a top face. Each elongate member also comprises a top lamella made of high quality wood and having a bottom face applied and glued to the top face of the core lamella. Also, each pair of laterally adjacent elongate members have respective edge surfaces applied and glued to each other, the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and the core lamellas of the laterally adjacent elongate members define a low quality, non apparent bottom surface of the stairtread.
According to another aspect of the subject invention, there is provided a method of fabricating a stairtread, comprising the steps of:
- making elongate core lamellas of low quality material having respective top faces;
- making elongate top lamellas of high quality wood having respective bottom faces;
- applying and gluing the bottom faces of the top lamellas to the top faces of the core lamellas, respectively, to form elongate members;
and - assembling the elongate members laterally adjacent to each other, the assembling step comprising applying and gluing to each other respective edge surfaces of each pair of laterally adjacent elongate members.
5 wherein (a) the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and (b) the core lamellas of the laterally adjacent elongate members define a low quality non apparent bottom surface of the stairtread.
By using core layers made of low quality wood, the stairtread structure in accordance with the present invention reduces the quantity of high quality wood required to construct the stairtread, but does not affect the aesthetic appearance of that stairtread.
The objects, advantages and other features of the present invention will become more apparent upon reading of the following non restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
By using core layers made of low quality wood, the stairtread structure in accordance with the present invention reduces the quantity of high quality wood required to construct the stairtread, but does not affect the aesthetic appearance of that stairtread.
The objects, advantages and other features of the present invention will become more apparent upon reading of the following non restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
- Figure 1 is an exploded, perspective view of a preferred embodiment of a wooden stairtread in accordance with the present invention;
- Figure 2 is a top, rear perspective view of the wooden stairtread of Figure 1;
- Figure 3 is a bottom, rear perspective view of the wooden stairtread of Figures 1 and 2;
- Figure 4a is a longitudinal, cross sectional view showing a butt joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4b is a longitudinal, cross sectional view showing a finger joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4c is a longitudinal, cross sectional view showing a halved joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4d is a longitudinal, cross sectional view showing a tongue and groove joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4e is a longitudinal, cross sectional view showing a dovetail halved joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 5 is an elevational end view of a second preferred embodiment of the wooden stairtread in accordance with the present invention; and - Figure 6 is an elevational end view of a third preferred embodiment of the wooden stairtread in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the wooden stairtread in accordance with the present invention illustrated in Figures 1-3 is generally identified by the reference 1.
In the embodiment of Figures 1-3, the wooden stairtread 1 comprises four elongate wooden members (lamellas) 2, 3, 4 and 5, and an elongate longitudinal nose member 6, each having a length corresponding to the length of the stairtread 1.
The nose member 6 is cut into a single solid piece of high quality wood and comprises a longitudinal edge surface 7 which is rounded in cross section to form the nose of the stairtread. The nose member 6 comprises another generally flat longitudinal edge surface 8.
The wooden members 2, 3, 4 and 5 are rectangular in cross section to be g assembled laterally adjacent to each other as will be described hereinafter.
More specifically, wooden member 2 is formed of a core lamella 9 made of low quality wood, and of a top lamella 10 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 9. In the example of Figures 1, 2 and 3, the core lamella 9 is made of three wood sections 11, 12 and 13 assembled (glued or not) end to end. Regarding the top lamella 10, it is cut into a single solid piece of high quality wood. As shown, the core lamella 9 made of low quality wood is well thicker than the top lamella made of high quality wood.
Wooden member 3 is formed of a core lamella 14 made of low quality wood, and of a top lamella 15 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 14. In the example of Figures 1, and 3, the core lamella 14 is made of three wood sections 16, 17 and 18 assembled (glued or not) end to end. Regarding the top lamella 15, it is cut into a single solid piece of high quality wood. Again, the core lamella 14 made of low quality wood is well thicker than the top lamella 15 made of high quality wood.
Wooden member 4 is formed of a core lamella 19 made of low quality wood, and of a top lamella 20 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 19. In the example of Figures 1, and 3, the core lamella 19 is made of two wood sections 19' and 19" assembled (glued or not) end to end. Regarding the top lamella 20, it is cut into a single solid piece of high quality wood. As shown, the core lamella 19 is well thicker than the top lamella 20.
Outer wooden member 5 is formed of a core lamella 21 made of low quality wood, and of a top lamella 22 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 21. In the example of Figures 1, 2 and 3, the core lamella 21 is cut into single solid piece of low quality wood.
Tests have demonstrated that providing the outer wooden member 5 with a solid core lamella 21 strengthens the stairtread 1. Regarding the top lamella 22, it is cut into a single solid piece of high quality wood. As shown, the core 15 lamella 21 is well thicker than the top lamella 22.
Wooden member 2 comprises a first generally flat longitudinal edge surface 23 applied and glued to the generally flat edge surface 8 of the nose member 6, wooden member 3 comprises a first generally flat longitudinal edge surface 24 applied and glued to a second generally flat edge surface 25 of wooden member 2, wooden member 4 comprises a first generally flat longitudinal edge surface applied and glued to a second generally flat edge surface 27 of wooden member 3, and wooden member 5 comprises a generally flat longitudinal edge surface 28 applied and glued to a second generally flat edge surface 29 of wooden member 4.
The wooden members 2, 3, 4 and 5 and the nose member 6 are therefore assembled laterally adjacent to each other to form the stairtread 1 of Figures 1-3.
As shown in Figure 2, the outer top surfaces 30, 31, 32 and 33 of the top lamellas 10, 15, 20 and 22 of the wooden members 2, 3, 4 and 5, and the outer top surface 34 of the nose member 6 define a 5 high quality wooden apparent top surface of the stairtread 1. As illustrated in Figure 3, the outer bottom surfaces 35, 36, 37 and 38 of the core lamellas 9, 14, 19 and 21 of the wooden members 2, 3, 4 and 5 define a low quality wooden, non apparent bottom surface of the stairtread 1.The outer bottom surface 39 of the nose member 6 defines a high quality wooden apparent front bottom surface of the stairtread 1.
Finally, as mentioned in the foregoing description, the rounded longitudinal edge surface 7 is of member 6 forms a high quality wooden apparent nose surface of the stairtread 1.
As the core lamellas 9, 14, 19 and 21 are made of low quality wood normally disposed of, and since the top lamellas 10, 15, 20 and 22 are thin, the quantity of high quality wood required to fabricate the stairtread 1 in accordance with the 5 present invention is greatly reduced. For these two reasons, the stairtread in accordance with the present invention saves wood, but without affecting the aesthetic appearance of the stairtread or the stability of the staircase.
Figures 4a-4e are longitudinal, cross sectional views showing different joints, 10 glued or not, and usable to assemble end to end the wood sections forming the core lamellas 9, 14 and 19. For example, butt joints (Figure 4a), triangular double notch joints (Figure 4b), halved joints (Figure 4B), tongue and groove joints (Figure 4d) and dovetail halved joints (Figure 4e) can be used.
Figure 5 shows the bottom surfaces of the core lamellas 9, 14, 19 and 21 covered with respective additional lamellas 40, 41, 42 and 43 of high quality wood.
The advantage of the structure of Figure 5 is that the top and bottom surfaces of the tread are both made of high quality wood.
In the embodiment of Figure 6, the stairtread 1 comprises an elongate tread body comprising a core layer made of lamellas 44-47, of low quality wood and of which the width may vary. To the top surface of the core layer are applied and glued top lamellas 48-52 of high quality wood to form a top layer. The core lamellas 44-are glued laterally adjacent to each other. In the same manner, the top lamellas 48-52 are glued laterally adjacent to each other. The width of the top lamellas 48-52 may vary with respect to each other and with respect to the width of the core lamellas 44-47. The number of top 48-52 and core 44-47 lamellas may also vary.
Finally, the elongate tread body comprises a longitudinal edge surface 53 applied and glued to a flat edge surface 54 of an elongate, longitudinal nose member cut into a single solid piece of high quality wood.
Preferably, the high quality wood and low quality wood used to fabricate a stairtread according to the invention will be of the same species. However, it is within the scope of the present invention to use high and low quality wood materials of different species.
It is also within the scope of the present invention to use low quality materials other than low quality wood to fabricate the core lamellas 9, 14, 19, 21 and 44-47.
For example, medium or high density fibre material can be envisaged.
Tests have demonstrated that a stairtread according to Figures 1-3 is 65% to 70%
as solid as a conventional wooden stairtread made of elongate solid wood lamellas glued laterally adjacent to each other. More specifically, a stairtread as illustrated in Figures 1-3 is capable of supporting at least 2000 pounds, which is well sufficient to meet with the standards of the industry.
As the core of the stairtread according to Figures 1-3 is made of solid wood, the balusters or spindles installed on the stairtread are as sturdy as in the case of a conventional wood tread.
Finally it should be mentioned that, in the stairtread as illustrated in Figures 1-3, the quantity of high quality wood required is reduced by 60%.
Although the present invention has been described hereinabove by way of a preferred embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and nature of the subject invention.
In the appended drawings:
- Figure 1 is an exploded, perspective view of a preferred embodiment of a wooden stairtread in accordance with the present invention;
- Figure 2 is a top, rear perspective view of the wooden stairtread of Figure 1;
- Figure 3 is a bottom, rear perspective view of the wooden stairtread of Figures 1 and 2;
- Figure 4a is a longitudinal, cross sectional view showing a butt joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4b is a longitudinal, cross sectional view showing a finger joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4c is a longitudinal, cross sectional view showing a halved joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4d is a longitudinal, cross sectional view showing a tongue and groove joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 4e is a longitudinal, cross sectional view showing a dovetail halved joint for assembling end to end sections of low quality wood and thereby form an elongate wooden lamella usable in the construction of the stairtread of Figures 1-3;
- Figure 5 is an elevational end view of a second preferred embodiment of the wooden stairtread in accordance with the present invention; and - Figure 6 is an elevational end view of a third preferred embodiment of the wooden stairtread in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the wooden stairtread in accordance with the present invention illustrated in Figures 1-3 is generally identified by the reference 1.
In the embodiment of Figures 1-3, the wooden stairtread 1 comprises four elongate wooden members (lamellas) 2, 3, 4 and 5, and an elongate longitudinal nose member 6, each having a length corresponding to the length of the stairtread 1.
The nose member 6 is cut into a single solid piece of high quality wood and comprises a longitudinal edge surface 7 which is rounded in cross section to form the nose of the stairtread. The nose member 6 comprises another generally flat longitudinal edge surface 8.
The wooden members 2, 3, 4 and 5 are rectangular in cross section to be g assembled laterally adjacent to each other as will be described hereinafter.
More specifically, wooden member 2 is formed of a core lamella 9 made of low quality wood, and of a top lamella 10 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 9. In the example of Figures 1, 2 and 3, the core lamella 9 is made of three wood sections 11, 12 and 13 assembled (glued or not) end to end. Regarding the top lamella 10, it is cut into a single solid piece of high quality wood. As shown, the core lamella 9 made of low quality wood is well thicker than the top lamella made of high quality wood.
Wooden member 3 is formed of a core lamella 14 made of low quality wood, and of a top lamella 15 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 14. In the example of Figures 1, and 3, the core lamella 14 is made of three wood sections 16, 17 and 18 assembled (glued or not) end to end. Regarding the top lamella 15, it is cut into a single solid piece of high quality wood. Again, the core lamella 14 made of low quality wood is well thicker than the top lamella 15 made of high quality wood.
Wooden member 4 is formed of a core lamella 19 made of low quality wood, and of a top lamella 20 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 19. In the example of Figures 1, and 3, the core lamella 19 is made of two wood sections 19' and 19" assembled (glued or not) end to end. Regarding the top lamella 20, it is cut into a single solid piece of high quality wood. As shown, the core lamella 19 is well thicker than the top lamella 20.
Outer wooden member 5 is formed of a core lamella 21 made of low quality wood, and of a top lamella 22 made of high quality wood and having a bottom face applied and glued to the top face of the core lamella 21. In the example of Figures 1, 2 and 3, the core lamella 21 is cut into single solid piece of low quality wood.
Tests have demonstrated that providing the outer wooden member 5 with a solid core lamella 21 strengthens the stairtread 1. Regarding the top lamella 22, it is cut into a single solid piece of high quality wood. As shown, the core 15 lamella 21 is well thicker than the top lamella 22.
Wooden member 2 comprises a first generally flat longitudinal edge surface 23 applied and glued to the generally flat edge surface 8 of the nose member 6, wooden member 3 comprises a first generally flat longitudinal edge surface 24 applied and glued to a second generally flat edge surface 25 of wooden member 2, wooden member 4 comprises a first generally flat longitudinal edge surface applied and glued to a second generally flat edge surface 27 of wooden member 3, and wooden member 5 comprises a generally flat longitudinal edge surface 28 applied and glued to a second generally flat edge surface 29 of wooden member 4.
The wooden members 2, 3, 4 and 5 and the nose member 6 are therefore assembled laterally adjacent to each other to form the stairtread 1 of Figures 1-3.
As shown in Figure 2, the outer top surfaces 30, 31, 32 and 33 of the top lamellas 10, 15, 20 and 22 of the wooden members 2, 3, 4 and 5, and the outer top surface 34 of the nose member 6 define a 5 high quality wooden apparent top surface of the stairtread 1. As illustrated in Figure 3, the outer bottom surfaces 35, 36, 37 and 38 of the core lamellas 9, 14, 19 and 21 of the wooden members 2, 3, 4 and 5 define a low quality wooden, non apparent bottom surface of the stairtread 1.The outer bottom surface 39 of the nose member 6 defines a high quality wooden apparent front bottom surface of the stairtread 1.
Finally, as mentioned in the foregoing description, the rounded longitudinal edge surface 7 is of member 6 forms a high quality wooden apparent nose surface of the stairtread 1.
As the core lamellas 9, 14, 19 and 21 are made of low quality wood normally disposed of, and since the top lamellas 10, 15, 20 and 22 are thin, the quantity of high quality wood required to fabricate the stairtread 1 in accordance with the 5 present invention is greatly reduced. For these two reasons, the stairtread in accordance with the present invention saves wood, but without affecting the aesthetic appearance of the stairtread or the stability of the staircase.
Figures 4a-4e are longitudinal, cross sectional views showing different joints, 10 glued or not, and usable to assemble end to end the wood sections forming the core lamellas 9, 14 and 19. For example, butt joints (Figure 4a), triangular double notch joints (Figure 4b), halved joints (Figure 4B), tongue and groove joints (Figure 4d) and dovetail halved joints (Figure 4e) can be used.
Figure 5 shows the bottom surfaces of the core lamellas 9, 14, 19 and 21 covered with respective additional lamellas 40, 41, 42 and 43 of high quality wood.
The advantage of the structure of Figure 5 is that the top and bottom surfaces of the tread are both made of high quality wood.
In the embodiment of Figure 6, the stairtread 1 comprises an elongate tread body comprising a core layer made of lamellas 44-47, of low quality wood and of which the width may vary. To the top surface of the core layer are applied and glued top lamellas 48-52 of high quality wood to form a top layer. The core lamellas 44-are glued laterally adjacent to each other. In the same manner, the top lamellas 48-52 are glued laterally adjacent to each other. The width of the top lamellas 48-52 may vary with respect to each other and with respect to the width of the core lamellas 44-47. The number of top 48-52 and core 44-47 lamellas may also vary.
Finally, the elongate tread body comprises a longitudinal edge surface 53 applied and glued to a flat edge surface 54 of an elongate, longitudinal nose member cut into a single solid piece of high quality wood.
Preferably, the high quality wood and low quality wood used to fabricate a stairtread according to the invention will be of the same species. However, it is within the scope of the present invention to use high and low quality wood materials of different species.
It is also within the scope of the present invention to use low quality materials other than low quality wood to fabricate the core lamellas 9, 14, 19, 21 and 44-47.
For example, medium or high density fibre material can be envisaged.
Tests have demonstrated that a stairtread according to Figures 1-3 is 65% to 70%
as solid as a conventional wooden stairtread made of elongate solid wood lamellas glued laterally adjacent to each other. More specifically, a stairtread as illustrated in Figures 1-3 is capable of supporting at least 2000 pounds, which is well sufficient to meet with the standards of the industry.
As the core of the stairtread according to Figures 1-3 is made of solid wood, the balusters or spindles installed on the stairtread are as sturdy as in the case of a conventional wood tread.
Finally it should be mentioned that, in the stairtread as illustrated in Figures 1-3, the quantity of high quality wood required is reduced by 60%.
Although the present invention has been described hereinabove by way of a preferred embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and nature of the subject invention.
Claims (20)
1. A stairtread comprising:
- an elongate nose member consisting of high quality wood and having a longitudinal edge surface and a longitudinal edge surface which is rounded in cross section to form a tread's nose; and - an elongate tread body comprising a core layer having a top face and a top layer having a bottom face applied and glued to the top face of the core layer;
- wherein (a) the core layer consists of a plurality of elongate thick lamellas consisting of low quality material and glued laterally adjacent to each other, (b) the top layer consisting of a plurality of elongate thin lamellas made of high quality wood and glued laterally adjacent to each other, (c) the tread body comprises a longitudinal edge surface applied and glued to the first longitudinal edge surface of the nose member, and (d) the top layer and nose member define high quality wooden apparent top and nose surfaces of the stairtread.
- an elongate nose member consisting of high quality wood and having a longitudinal edge surface and a longitudinal edge surface which is rounded in cross section to form a tread's nose; and - an elongate tread body comprising a core layer having a top face and a top layer having a bottom face applied and glued to the top face of the core layer;
- wherein (a) the core layer consists of a plurality of elongate thick lamellas consisting of low quality material and glued laterally adjacent to each other, (b) the top layer consisting of a plurality of elongate thin lamellas made of high quality wood and glued laterally adjacent to each other, (c) the tread body comprises a longitudinal edge surface applied and glued to the first longitudinal edge surface of the nose member, and (d) the top layer and nose member define high quality wooden apparent top and nose surfaces of the stairtread.
2. The stairtread of claim 1, in which the first elongate thick lamellas of the core layer consists of low quality wood.
3. The stairtread of claim 2, in which at least one of said elongate thick lamellas of the core layer comprises a plurality of sections of low quality wood assembled end to end.
4. The stairtread of claim 1, wherein the elongate nose member consists of a single solid piece of high quality wood.
5. The stairtread of claim 1, in which each elongate thin lamella of the top layer consists of a single solid piece of high quality wood.
6. The stairtread of claim 1, in which the elongate tread body comprises a bottom face, and in which the stairtread further comprises a bottom layer consisting of high quality wood and having a top face applied and glued to the bottom face of the elongate tread body.
7. The stairtread of claim 6, wherein said bottom layer comprises a plurality of laterally adjacent thin elongate lamellas each cut in a single solid piece of high quality wood.
8. A method of fabricating a stairtread, comprising the steps of:
- making an elongate nose member consisting of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose;
- making elongate thick core lamellas of low quality material;
- making elongate top lamellas of high quality wood having respective bottom faces;
- gluing the elongate thick core lamellas laterally adjacent to each other to form an elongate core layer of low quality material having a top face;
- assembling the elongate thin top lamellas to form an elongate top layer of high quality wood, said assembling step comprising gluing the elongate thin top lamellas laterally adjacent to each other and gluing the bottom faces of the top lamellas to the top face of the core layer; and - applying and gluing the first longitudinal edge surface of the nose member to a longitudinal edge surface of the core layer;
- wherein the top layer and nose member define high quality wooden apparent top and nose surfaces of the stairtread.
- making an elongate nose member consisting of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose;
- making elongate thick core lamellas of low quality material;
- making elongate top lamellas of high quality wood having respective bottom faces;
- gluing the elongate thick core lamellas laterally adjacent to each other to form an elongate core layer of low quality material having a top face;
- assembling the elongate thin top lamellas to form an elongate top layer of high quality wood, said assembling step comprising gluing the elongate thin top lamellas laterally adjacent to each other and gluing the bottom faces of the top lamellas to the top face of the core layer; and - applying and gluing the first longitudinal edge surface of the nose member to a longitudinal edge surface of the core layer;
- wherein the top layer and nose member define high quality wooden apparent top and nose surfaces of the stairtread.
9. A method of fabricating a stairtread as recited in claim 9, in which said step of making elongate thick core lamellas comprises assembling a plurality of sections of low quality wood end to end to form one of said core lamellas.
10. A stairtread comprising a plurality of elongate members assembled laterally adjacent to each other, each of said elongate members comprising a core lamella consisting of low quality material and having a top face, each of said elongate members also comprising a top lamella made of high quality wood and having a bottom face applied and glued to the top face of the core lamella, wherein (a) each pair of laterally adjacent elongate members have respective edge surfaces applied and glued to each other, (b) the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and (c) the core lamellas of the laterally adjacent elongate members define a low quality, non apparent bottom surface of the stairtread, an elongate nose member being applied and glued to the longitudinal edge surface of an elongate member.
11. The stairtread of claim 10, in which the core lamella of each elongate member consists of low quality wood.
12. The stairtread of claim 11, in which the core lamella of at least one of said members comprises a plurality of sections made of low quality wood and assembled end to end.
13. The stairtread of claim 10, wherein in each of said elongate members, the core lamella made of low quality material is thicker than the top lamella made of high quality wood.
14. The stairtread of claim 10, further comprising an elongate, longitudinal nose member made of high quality wood and having (a) a first longitudinal edge surface applied and glued to an exposed longitudinal edge surface of an outermost one of said elongate members and (b) a second longitudinal edge surface which is rounded in cross section to form a tread's nose.
15. The stairtread of claim 14, wherein said nose member consists of a single solid piece of high quality wood.
16. The stairtread of claim 10, in which the top lamella of each elongate member consists of a single solid piece of high quality wood.
17. The stairtread of claim 10, in which the core lamella of each of said elongate members comprises a bottom face, and in which each of said elongate members further comprises a bottom lamella made of high quality wood and having a top face applied and glued to the bottom face of the core lamella.
18. A method of fabricating a stairtread, comprising the steps of:
- making elongate core lamellas of low quality material having respective top faces;
- making elongate top lamellas of high quality wood having respective bottom faces;
- applying and gluing the bottom faces of the top lamellas to the top faces of the core lamellas, respectively, to form elongate members; and - assembling said elongate members laterally adjacent to each other, said assembling step comprising applying and gluing to each other respective edge surfaces of each pair of laterally adjacent elongate members; and - applying and gluing an elongate nose member to a longitudinal edge surface of an elongate member;
- wherein (a) the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and (b) the core lamellas of the laterally adjacent elongate members define a low quality non apparent bottom surface of the stairtread.
- making elongate core lamellas of low quality material having respective top faces;
- making elongate top lamellas of high quality wood having respective bottom faces;
- applying and gluing the bottom faces of the top lamellas to the top faces of the core lamellas, respectively, to form elongate members; and - assembling said elongate members laterally adjacent to each other, said assembling step comprising applying and gluing to each other respective edge surfaces of each pair of laterally adjacent elongate members; and - applying and gluing an elongate nose member to a longitudinal edge surface of an elongate member;
- wherein (a) the top lamellas of the laterally adjacent elongate members define a high quality wooden apparent top surface of the stairtread, and (b) the core lamellas of the laterally adjacent elongate members define a low quality non apparent bottom surface of the stairtread.
19. A method of fabricating a stairtread as recited in claim 18, in which said step of making core lamellas comprises assembling a plurality of sections of low quality wood end to end to form one of said core lamellas.
20. A method of fabricating a stairtread as recited in claim 18, further comprising the step of producing an elongate, longitudinal nose member consisting of high quality wood and having a first longitudinal edge surface and a second longitudinal edge surface which is rounded in cross section to form a tread's nose, and the step of applying and gluing the first longitudinal edge surface to an exposed longitudinal edge surface of an outermost one of said elongate members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2138867 CA2138867C (en) | 1994-12-22 | 1994-12-22 | Stairtread made of a combination of high quality wood and low quality material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2138867 CA2138867C (en) | 1994-12-22 | 1994-12-22 | Stairtread made of a combination of high quality wood and low quality material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2138867A1 CA2138867A1 (en) | 1996-06-23 |
| CA2138867C true CA2138867C (en) | 2001-03-20 |
Family
ID=4154910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2138867 Expired - Fee Related CA2138867C (en) | 1994-12-22 | 1994-12-22 | Stairtread made of a combination of high quality wood and low quality material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2138867C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473293A (en) * | 2013-08-27 | 2016-04-06 | 瓦林格创新股份有限公司 | A method for producing a lamella core |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5985398A (en) | 1994-12-27 | 1999-11-16 | Manufacture De Lambton Ltee | Stairtread made of a combination of higher quality wood and lower quality material |
| RU2624212C2 (en) * | 2012-02-02 | 2017-07-03 | Велинге Инновейшн Аб | Inner layer from lamellas and its manufacturing method |
-
1994
- 1994-12-22 CA CA 2138867 patent/CA2138867C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473293A (en) * | 2013-08-27 | 2016-04-06 | 瓦林格创新股份有限公司 | A method for producing a lamella core |
| CN105473293B (en) * | 2013-08-27 | 2019-05-14 | 瓦林格创新股份有限公司 | Method for producing laminate core |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2138867A1 (en) | 1996-06-23 |
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