Joints and connections – Rod end to transverse side of member – Corner joint
Patent
1998-02-26
2000-04-04
Browne, Lynne H.
Joints and connections
Rod end to transverse side of member
Corner joint
403230, 4034081, F16B 1202
Patent
active
060452900
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a corner joint between the end portions of two board-like members made of wood or woodlike material in a frame for joining furniture parts, the end portion of the first member being provided with at least one projecting part substantially parallel to one of the long end edges of said member and engaging in one or more corresponding mortises in the end portion of the second member, said members being held together by means of one or more securing means in the form of one or more stud means, whereby the projecting part or parts of the first member and the corresponding mortise or mortises of the second member are substantially wedge-shaped, and that the end portion of the first member is further provided with a mainly box-type projection adjacent to one end face of the second member.
DESCRIPTION OF THE PRIOR ART
EP patent application 0 479 767 describes a corner joint between two members provided with interacting projecting part and mortise, said members being secured with respect to each other by means of glue or by means of undercutting the mortise. However, this is not a satisfactory solution, as gluing requires the ends to be pressed together while the glue is drying. Moreover, the members are not easily separated once the corner joint is established. If the members of the corner joint are undercut, said members will not be secured in the longitudinal direction of the projecting part or parts, unless said part or parts are directly pressed into the mortise, the latter requiring an exact dimensioning of the members with respect to each other.
U.S. Pat. No. 3,944,310 discloses a joint having a first member with a projection engaging in a mortise in a second member, the projection and mortise being wedge-shaped, a box-shaped projection being provided on the first member and a bolt connecting the members. The corner joint does not work satisfactorily because it cannot be established and separated so quickly. The establishment or separation requires use of a screwdriver. Besides, the stress load on the boly--when the corner joint is exposed to a bending moment--is concentrated to a very limited zone, namely the zone where the bolt is leaving the first member and goes into the other member.
SUMMARY OF THE INVENTION
The object of the invention is to provide a corner joint of the above-mentioned type, said corner joint being able to secure the members with respect to each other against forces in any given direction, while at the same time--if desired--allowing easy separation without damaging the members.
The corner joint according to the invention is characterized in that the stud means is (are) arranged mainly perpendicular to the large outer side face of the box-type projection of the first member and moreover is (are) fixed in drilled holes in said box-type projection and in the end portion of the second member by interference fit, the stud means interseting the projection part or parts. When assembled, the members of the corner joint are thus secured with respect to each other against forces in any given direction. As soon as the securing means are removed, the members are no longer held together. The corner joint is easily assembled and separated and moreover, it is easy to manufacture.
According to the invention, the projection part or parts of the first member can be intersected by the stud means in such a way that the area covered by the separate intersection--seen in cross-section perpendicular to the longitudinal axis of the stud means--corresponds to only part of the cross-sectional area of the stud means. This embodiment allows for a greater degree of constructional freedom.
According to the invention, the projecting parts of the first member can be present in a number of two or three and together define a zigzag shape. This is a particularly advantageous embodiment, if the first member is considerably thicker relative to the second member, since the contact area between the two members can be significantly enlarged thus increasing the rigidity
REFERENCES:
patent: 16557 (1857-02-01), Stimpson
patent: 637212 (1899-11-01), McCune
patent: 1110009 (1914-09-01), Ritter
patent: 1335554 (1920-03-01), Callahan
patent: 1533099 (1925-04-01), Carroll
patent: 5536108 (1996-07-01), Kvalheim
MI, A Woodworker's Guide to Joinery by Thomas H. Jones, Sep. 1983.
The Carpenters and Joiners Assistance, Joints in Joinery by Newlands, 1860.
Backus Richard E.
Browne Lynne H.
IKEA International A/S
Thompson Kenneth
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