Title of Invention	AN IMPROVED METHOD OF FORMING JOINTS MADE BY FORCING DOWELS OF WOOD AND OTHER ELASTIC MATERIALS INTO HOLES OF WOOD AND OTHER ELASTIC OR NON-ELASTIC, SIMILAR OR DISSIMILAR MATERIALS.
Abstract	An improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials comprising insertion of the dowels (D) by pressure into the holes (H), characterised in that the method comprises the steps of: (a) fabricating dowels of round or oval cross-section and of diameter exactly equal/or of diameter less to that of the holes at the outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting ths dowels longitudinally along the axis starting from ths tip (T) towards the base (B) thereof, along a part (P) of ths length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon.

Title of Invention

AN IMPROVED METHOD OF FORMING JOINTS MADE BY FORCING DOWELS OF WOOD AND OTHER ELASTIC MATERIALS INTO HOLES OF WOOD AND OTHER ELASTIC OR NON-ELASTIC, SIMILAR OR DISSIMILAR MATERIALS.

Abstract

An improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials comprising insertion of the dowels (D) by pressure into the holes (H), characterised in that the method comprises the steps of: (a) fabricating dowels of round or oval cross-section and of diameter exactly equal/or of diameter less to that of the holes at the outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting ths dowels longitudinally along the axis starting from ths tip (T) towards the base (B) thereof, along a part (P) of ths length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon.

Full Text	The present invention relates to an improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of v/ood and other elastic or non-elastic, similar or dissimilar materials. The joints made by pressing dowels of wood and other materials into holes in bodies of wood and other materials in the existing methods suffer from one drawback that the dowels and holes are required to be of exactly correct size and/or taper to ensure adequate tightness of the joints formed by pressing the dowels into the holes involving an increased cost and time for fabricating the same, and from another drawback that the joints formed at a given humidity and temperature condition of the atmosphere lose their tightness when exposed to a different humidity and temperature condition of the atmosphere because of shrinkage or expansion of wood and other materials with loss or gain of moisture and/or due to thermal effects. One object of the present invention is to provide a relatively fast and inexpensive method of forming joints between dowels of v/ood and other elastic materials, and holes of equal or smaller size, and equal or greater taper, requiring thereby reduced fabrication cost and time. Another object of the invention is to provide a method in which the tightness of the joints formed at a given humidity and temperature condition of atmosphere is not lost when exposed to an atmosphere of lower or higher humidity and temperature condition. Yet another object of the invention is to provide a method in which the tightness of the joints is not lost through - 2 - mechanical handling of the bodies joined by pressing dowels into holes therein. In the existing method the dowels used are incompressible in their lateral directions by the pressure applied thereon when these are forced into the holes in bodies of wood and other materials. In the invented method the dowels have been made laterally compressible by slitting these longitudinally along the axis thereof starting from the end to be entered into the holes upto a part of its length to be inserted into the holes. A lateral compressive force is thereby generated between the outer surface of the dowels and the inner surface of the holes when the dowels are pressed into the suitably tapered holes to maintain the tightness of the joints when exposed to an atmosphere of relatively low or high humidity and temperature condition* In addition, an adhesive of known types is applied on the outer surface of the dowels and, if necessary, also on the inner surface of the holes, immediately before forcing the dowels into the suitably tapered holes to maintain the tightness of the joints during mechanical handling of the bodies joined together. Thus the invention provides an improved method of forming joints by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials, comprising insertion of the dowels by pressure into the holes, characterised in that the method comprises the steps of : (a) fabricating dowels of round or oval cross-section and of diameter exactly equal or of diameter less to that of the holes at the outer end thereof; - 3 - (b) fabricating holes of appoximately round or ovel/cross-section and of diameter tapering from the outer end to the inner end thereof; (c) slitting the dowels longitudinally along the axis starting from the tip towards the base thereof, along a part of the length from the tip to the base, into at least two equal sections; (d) applying an adhesive of known types on the outer surface of the dowels and if necessary, on the inner surface of the holes as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon. The invention is described fully and particularly in an unrestricted manner with reference to the accompanying drawings, in which - Figure 1 illustrates one existing method of forming dowels and holes; Figure 2 illustrates another existing method of forming dowels and holes; Figure 3 illustrates one invented method of forming dowels and holes; and Figure 4 illustrates cross-sections of dowels used in the invented method by splitting the same into longitudinal sections along the axis, into : (A) two equal sections, (B) three equal sections and (C) four equal sections. Multiple sections may also be used. Referring to Figure 1, dowels (D) and holes (H) are each made of round cross-sections of uniform diameter throughout their entire length, the diameter of dowels being made exactly equal to - 4 - that of the outer side of the corresponding holes, to ensure a tight fit between the two, when the dowels are forced into the holes. Referring to Figure 2, while the dowels (D) are made of round cross-section of diameter tapering along the length to be inserted into the holes, the holes (H) are made of round cross-section of diameter tapering from their outer end to the inner end at a predetermined angle, requiring the angle of taper of the dowels and holes to be made exactly equal. Referring to Figure 3, the dowels (D) are made of round cross-section of uniform diameter along their entire length, having an axial slit (s) cut from their tip (T) towards their base (B), extending over a part (P) which is 10% to 100% of their entire length from tip (T) to base (B); and the corresponding holes (H) are made of round cross-section with the diameter at their outer end (0) being either exactly or approximately equal to the diameter of the dowels (D). The dowels after insertion into the holes taper to reduced diameter at their inner end (I) at an angle i.e. 2° to 60° with the axis of the holes. Referring to Figure 4, the number of the axially split up sections in the dowels used in the invented method may be two to four or more. Because of the use of laterally compressible dowels, and the need for fabrication of dowels and holes of only equal or approximately equal size and taper, and because of the application of an adhesive on the surface of the dowels and if necessary, on the inner surface of the holes as well, Joints of durable tightness - 5 - D 11 3-46OO-3-04 are formed at a reduced fabrication cost and at an increased speed in the Invented method. There may be various modifications of the method of forming the joints by forcing dowels of wood and other materials into holes in bodies of wood and other materials following the inventive concept disclosed In the instant application. It Is to be noted that all such modifications will fall within the scope of the inventive concept of the instant application. I Claim :- 1. An improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials, comprising insertion of the dowels (D) by pressure into the holes (H), characterised in that the method comprises the steps of: (a) fabricating dowels of round or oval cross-section and of diameter exactly equal/or of diameter less to that of the holes at the outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting the dov/els longitudinally along the axis starting from the tip (T) towards the base (B) thereof, along a part (P) of the length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon. 2. The improved method as claimed in claim 1, wherein the length of the split up part (P) of dowels (D) is 10% to 100% of the length of dowels from tip (T) to base (B) thereof. 3. The improved method as claimed in claim 1 or 2, wherein the diameter of holes (H) is tapered from the outer end (0) to the inner end (I) at an angle of 2° to 60° with the axis thereof. - 7 - 4. The improved method as claimed in any preceding claims, wherein the number of longitudinal sections in the axial direction of dowels (D) is 2 to 4 or more. 5. An improved method of forming joints by forcing dowels of wood and other materials into holes in bodies of wood and other materials, substantially as herein described and illustrated in Figures 3 and 4 of the accompanying drawings. An improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials comprising insertion of the dowels (D) by pressure into the holes (H), characterised in that the method comprises the steps of: (a) fabricating dowels of round or oval cross-section and of diameter exactly equal/or of diameter less to that of the holes at the outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting ths dowels longitudinally along the axis starting from ths tip (T) towards the base (B) thereof, along a part (P) of ths length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon.

Full Text

The present invention relates to an improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of v/ood and other elastic or non-elastic, similar or dissimilar materials.
The joints made by pressing dowels of wood and other materials into holes in bodies of wood and other materials in the existing methods suffer from one drawback that the dowels and holes are required to be of exactly correct size and/or taper to ensure adequate tightness of the joints formed by pressing the dowels into the holes involving an increased cost and time for fabricating the same, and from another drawback that the joints formed at a given humidity and temperature condition of the atmosphere lose their tightness when exposed to a different humidity and temperature condition of the atmosphere because of shrinkage or expansion of wood and other materials with loss or gain of moisture and/or due to thermal effects.
One object of the present invention is to provide a relatively fast and inexpensive method of forming joints between dowels of v/ood and other elastic materials, and holes of equal or smaller size, and equal or greater taper, requiring thereby reduced fabrication cost and time.
Another object of the invention is to provide a method in which the tightness of the joints formed at a given humidity and temperature condition of atmosphere is not lost when exposed to an atmosphere of lower or higher humidity and temperature condition.
Yet another object of the invention is to provide a method in which the tightness of the joints is not lost through
- 2 -
mechanical handling of the bodies joined by pressing dowels into holes therein.
In the existing method the dowels used are incompressible in their lateral directions by the pressure applied thereon when these are forced into the holes in bodies of wood and other materials.
In the invented method the dowels have been made laterally compressible by slitting these longitudinally along the axis thereof starting from the end to be entered into the holes upto a part of its length to be inserted into the holes. A lateral compressive force is thereby generated between the outer surface of the dowels and the inner surface of the holes when the dowels are pressed into the suitably tapered holes to maintain the tightness of the joints when exposed to an atmosphere of relatively low or high humidity and temperature condition*
In addition, an adhesive of known types is applied on the outer surface of the dowels and, if necessary, also on the inner surface of the holes, immediately before forcing the dowels into the suitably tapered holes to maintain the tightness of the joints during mechanical handling of the bodies joined together.
Thus the invention provides an improved method of forming joints by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials, comprising insertion of the dowels by pressure into the holes, characterised in that the method comprises the steps of : (a) fabricating dowels of round or oval cross-section and of diameter exactly equal or of diameter less to that of the holes at the outer end thereof;
- 3 -
(b) fabricating holes of appoximately round or ovel/cross-section and of
diameter tapering from the outer end to the inner end thereof;
(c) slitting the dowels longitudinally along the axis starting
from the tip towards the base thereof, along a part of the length
from the tip to the base, into at least two equal sections;
(d) applying an adhesive of known types on the outer surface of
the dowels and if necessary, on the inner surface of the holes
as well, immediately before forcing the dowels into the holes;
and (e) inserting the dowels into the holes by applying force
thereon.
The invention is described fully and particularly in an unrestricted manner with reference to the accompanying drawings, in which -
Figure 1 illustrates one existing method of forming dowels and holes;
Figure 2 illustrates another existing method of forming dowels and holes;
Figure 3 illustrates one invented method of forming dowels and holes; and
Figure 4 illustrates cross-sections of dowels used in the invented method by splitting the same into longitudinal sections along the axis, into : (A) two equal sections, (B) three equal sections and (C) four equal sections. Multiple sections may also be used.
Referring to Figure 1, dowels (D) and holes (H) are each made of round cross-sections of uniform diameter throughout their entire length, the diameter of dowels being made exactly equal to
- 4 -
that of the outer side of the corresponding holes, to ensure a tight fit between the two, when the dowels are forced into the holes.
Referring to Figure 2, while the dowels (D) are made of round cross-section of diameter tapering along the length to be inserted into the holes, the holes (H) are made of round cross-section of diameter tapering from their outer end to the inner end at a predetermined angle, requiring the angle of taper of the dowels and holes to be made exactly equal.
Referring to Figure 3, the dowels (D) are made of round cross-section of uniform diameter along their entire length, having an axial slit (s) cut from their tip (T) towards their base (B), extending over a part (P) which is 10% to 100% of their entire length from tip (T) to base (B); and the corresponding holes (H) are made of round cross-section with the diameter at their outer end (0) being either exactly or approximately equal to the diameter of the dowels (D). The dowels after insertion into the holes taper to reduced diameter at their inner end (I) at an angle i.e. 2° to 60° with the axis of the holes.
Referring to Figure 4, the number of the axially split up sections in the dowels used in the invented method may be two to four or more.
Because of the use of laterally compressible dowels, and the need for fabrication of dowels and holes of only equal or approximately equal size and taper, and because of the application of an adhesive on the surface of the dowels and if necessary, on the inner surface of the holes as well, Joints of durable tightness
- 5 -
D 11 3-46OO-3-04
are formed at a reduced fabrication cost and at an increased speed in the Invented method.
There may be various modifications of the method of forming the joints by forcing dowels of wood and other materials into holes in bodies of wood and other materials following the
inventive concept disclosed In the instant application. It Is to be noted that all such modifications will fall within the scope of the inventive concept of the instant application.
I Claim :-
1. An improved method of forming joints made by forcing
dowels of wood and other elastic materials into holes of wood and
other elastic or non-elastic, similar or dissimilar materials,
comprising insertion of the dowels (D) by pressure into the holes
(H), characterised in that the method comprises the steps of:
(a) fabricating dowels of round or oval cross-section and of
diameter exactly equal/or of diameter less to that of the holes at the
outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting the dov/els longitudinally along the axis starting from the tip (T) towards the base (B) thereof, along a part (P) of the length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon.
2. The improved method as claimed in claim 1, wherein the
length of the split up part (P) of dowels (D) is 10% to 100% of
the length of dowels from tip (T) to base (B) thereof.
3. The improved method as claimed in claim 1 or 2, wherein
the diameter of holes (H) is tapered from the outer end (0) to
the inner end (I) at an angle of 2° to 60° with the axis thereof.
- 7 -
4. The improved method as claimed in any preceding
claims, wherein the number of longitudinal sections in the
axial direction of dowels (D) is 2 to 4 or more.
5. An improved method of forming joints by forcing dowels
of wood and other materials into holes in bodies of wood and
other materials, substantially as herein described and
illustrated in Figures 3 and 4 of the accompanying drawings.
An improved method of forming joints made by forcing dowels of wood and other elastic materials into holes of wood and other elastic or non-elastic, similar or dissimilar materials comprising insertion of the dowels (D) by pressure into the holes (H), characterised in that the method comprises the steps of:
(a) fabricating dowels of round or oval cross-section and of
diameter exactly equal/or of diameter less to that of the holes at the
outer end (0) thereof; (b) fabricating holes of round or oval cross-section and of diameter tapering from the outer end (0) to the inner end (I) thereof; (c) slitting ths dowels longitudinally along the axis starting from ths tip (T) towards the base (B) thereof, along a part (P) of ths length from the tip (T) to the base (B), into at least two equal sections (1, 2); (d) applying an adhesive of known types on the outer surface of the dowels (D) and if necessary, on the inner surface of the holes (H) as well, immediately before forcing the dowels into the holes; and (e) inserting the dowels into the holes by applying force thereon.

Documents:

00406-kol-2004-abstract.pdf

00406-kol-2004-claims.pdf

00406-kol-2004-correspondence.pdf

00406-kol-2004-description(complete).pdf

00406-kol-2004-drawings.pdf

00406-kol-2004-form-1.pdf

00406-kol-2004-form-18.pdf

00406-kol-2004-form-2.pdf

00406-kol-2004-form-3.pdf

00406-kol-2004-letters patent.pdf

00406-kol-2004-p.a.pdf

406-KOL-2004-CORRESPONDENCE-1.1.pdf

406-KOL-2004-CORRESPONDENCE.pdf

406-KOL-2004-FORM 27.pdf

« Previous Patent

Next Patent »

Patent Number

207167

Indian Patent Application Number

406/KOL/2004

PG Journal Number

21/2007

Publication Date

25-May-2007

Grant Date

23-May-2007

Date of Filing

08-Jul-2004

Name of Patentee

VIJAY TALWAR.

Applicant Address

BB-53, SALT LAKE, SECTOR-I, KOLKATA-64.

Inventors:

#	Inventor's Name	Inventor's Address
1	VIJAY TALWAR.	BB-53, SALT LAKE, SECTOR-I, KOLKATA-64.

PCT International Classification Number

F16B 13/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA