Static structures (e.g. – buildings) – Machine or implement
Reexamination Certificate
2000-06-06
2001-08-21
Callo, Laura A. (Department: 3635)
Static structures (e.g., buildings)
Machine or implement
C052S749100, C052S481100, C052S745190, C144S368000, C144S371000, C144S376000
Reexamination Certificate
active
06276110
ABSTRACT:
The present invention relates to a stud for a timber wall, and also to a method for manufacturing the stud according to the preamble to the appended main claims.
The timber wall which the stud according to the present invention is intended for consists of panels, normally plaster board panels, secured on a wooden frame. The wooden frame normally consists of a sill or a ground plate at the bottom, and a top plate at the top, with studs running between them. Plaster board panels or the like are then secured on this stud frame, on one or both sides. In door openings and the like, so-called nogging pieces are also mounted between the studs. A wall of this type should, int. al., be sound insulating and thermally insulating, this latter being particularly applicable to an outer wall. Naturally, the walls should also be as configurationally stable as possible.
The present invention is based on the concept of making grooves in the stud in order to obtain improved properties as regards straightness, sound insulation and thermal insulation.
It has per se been previously known in the art to make, for different reasons, grooves in studs. But the novel feature according to the present invention resides in the manner in which the grooves are arranged as well as how they are formed.
When sound is generated on one side of a timber wall of the above-described type, the panels on that side of the wall are set in motion. If the studs are homogeneous and relatively rigid, they transmit the oscillation movement to the panel on the other side of the wall without any actual damping. A method of avoiding this sound transmission is to render the studs less homogeneous and weaker so that the oscillations are not transmitted as easily between both sides of the walls. The result of a less homogeneous and weaker stud will be improved sound insulation. In the present invention, by placing grooves alternatingly from different directions, a stud will be obtained with an approximately S-shaped cross section, the S-configuration making the stud resiliently yieldable in the direction between the panels, while the rigidity of the stud in other directions is affected to a lesser extent. Moreover, the grooves are compressed somewhat under the action of physical force, which contributes to the sound insulation properties. As a result of the improved sound insulation, in certain cases the necessity of building a thicker wall in order to give the desired sound insulation is avoided.
Wood always absorbs and gives off water to and from its surroundings depending upon the air humidity, which influences the configurational stability of the stud. When the moist ratio in the wood falls, it shrinks and when the moisture ratio rises the wood swells. These shrinkages and swellings are of different magnitude in different directions because the wood fibres lie in different directions. This in turn results in tension occurring in the wood. Many of these local tensions in the wood counteract one another, for which reason they give no visible result, but a number of the local tensions cooperate which may result in the timber becoming bent and/or warped. By providing grooves in the stud, many of the locally built-up tensions are reduced. Those tensions which remain result, after the provision of the groove, only in the width of the groove varying somewhat, which is of no importance to the function of the stud.
For example, a through-going outer wall stud often acts as a cold bridge even though wood is a relatively good thermal insulator. Air, and particularly motionless air, is however, a considerably better thermal insulator. By providing the stud with grooves according to the present invention, there is at least one air column in every conceivable cross section. This implies that the heat will have a considerably longer distance to go when it must be spread in both the longitudinal and lateral directions.
One object of the present invention has thus been to develop a stud with improved properties as regards straightness, sound insulation and thermal insulation.
REFERENCES:
patent: 2922201 (1960-01-01), Baker
patent: 3159235 (1964-12-01), Young et al.
patent: 3992838 (1976-11-01), Vizziello
patent: 3999343 (1976-12-01), Roberts
patent: 4167961 (1979-09-01), Paris, Jr. et al.
patent: 4235057 (1980-11-01), Teeters
patent: 4344263 (1982-08-01), Farmont
patent: 4909294 (1990-03-01), Gamba
patent: 173068 (1993-07-01), None
patent: 9607802 (1996-03-01), None
patent: 9607519 (1996-03-01), None
Callo Laura A.
Ladas & Parry
Sodra Timber AB
LandOfFree
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