Patent Application
20120260602
1. Field of Invention
The present invention relates to the method by which the holding steps are formed into the panel grooves of the spring-loaded split-tongue locking tongue connector of utility U.S. patent application Ser. No. 12/705,593, EFS ID 7006498 of Baker and Vitale on a method for “Laying and Mechanically Joining Building Panels or Construction Elements”. The panels of the above application are joined via an auxiliary connector element which engages suitably shaped panel grooves formed in the construction panels as shown schematically below. The resulting connector tongue and panel groove combination is referred to as a “spring-loaded split-tongue locking connector system”. The grooves are fabricated into the construction panels in such a manner as to not result in the loss of panel surface material, or damage to the panel surface material resulting from the use of a through fastener. The tongues on the connector element are split tongues having one or more tongue grooves that divide the split tongue into two or more sub-tongues. The connector sub-tongues are able to flex toward each other to permit ease of installation of the auxiliary connector into the construction panel. The sub-tongues have catches integrated into their distal ends; and the panel grooves have mating steps integrated into their side walls. Upon installation of the split tongue into the panel groove, the spring action of the sub-tongues cause the suitably located and shaped sub-tongue catches to engage the panel groove steps. The sub-tongue catch and panel groove step, once engaged interact with each other in such a manner as to further pull the split-tongue into the panel groove and to hold or lock the auxiliary connector and construction panel together. The resulting connector tongue and panel groove combination is referred to as a “spring-loaded split-tongue locking connector system”. The split tongues on the auxiliary connector and its mating panel groove can be arranged to allow either lateral mating, in which the tongue is inserted into the groove in a direction parallel to the panel surface; or normal mating, in which the tongue is inserted into the groove in a direction that is normal to the panel surface. The insertion and locking operation of spring-loaded split-tongue locking connector system has been demonstrated to operate as described above via number of small (1.5″ long) prototypical demonstrators in both the lateral and normal mating configurations.
2. Description of Related Art
The present invention relates to the fabrication of the sidewall steps in the panel groove are of the panel elements. In the drawings associated with U.S. patent application Ser. No. 12/705,593, the steps are shown as being cut into the panel groove at a large angle of 75° to 85° relative to the groove axis (i.e., the direction of tongue insertion). For economical commercial production, these steps must be cut at high speed, typically 360 linear feet per minute. The geometry of steps in the above referenced patent application limits production fabrication to the use of one of two well-known cutting tools: a rotary router cutter or a linear broach cutter. Unfortunately, both cutting techniques are incapable of cutting the requisite steps at rates approaching those required for economical commercial production rates due to excessive tool heating and cutting chip removal difficulties.
The present invention addresses the primary impediment to economical commercial production of a spring-loaded split-tongue locking connector system, i.e., the large angle of the groove step. Rather than using a large angle relative to the groove axis of 75° to 85°, the angle is reduced to a smaller value of between 20° to 70°. This smaller angle, while still remaining under the cover of the previous patent application claims, allows step fabrication to be performed using a third well-known fabrication tool more suited to economical high-speed production: the rotary circular saw.
It is not obvious that this modification to step angle can be made for two reasons: if the step is made too small the holding feature of the catch and step is compromised, but if the angle is made too large, while still being able to be cut with a circular saw, the panel groove may become excessively wide and the structural integrity of the connector system is compromised.
Finally, it has been observed that a substantial increase in desirable performance characteristics has been realized with the current groove geometry. It is therefore the intention of the inventors to include the fabrication of the aforementioned groove, by any means, whether circular sawblade type cutters, larger more complex rotary cutters, or a rotary router bit type cutter, within the scope of this patent application. In short, no matter the means whereby this groove has been fabricated, it is intended that it remain within the scope of the protection afforded by this invention.
In an exemplary embodiment of the present invention, there is disclosed a method of mechanically joining wood panels side edge to side edge comprises:
cutting grooves into the side edges of at least two panels that are to be joined together with a connector with no loss of top or bottom panel surface;
cutting a first step edge groove into the side edge of a panel at an angle “5”;
cutting a second step edge opposite the first step edge groove into the side edge of the panel at an angle “s” of between 10 degrees and 75 degrees;
cutting an angle “e” of an entrance ramp along the first step edge groove at an angle of between 0 degrees and 45 degrees;
cutting an angle “e” of the entrance ramp along the second step edge groove at an angle of between 0 degrees and 45 degrees; and
The more important features of the invention have thus been outlined in order that the more detailed description that follows may be better understood and in order that the present contribution to the art may better be appreciated. Additional features of the invention will be described hereinafter and will form the subject matter of the claims that follow.
Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
The foregoing has outlined, rather broadly, the preferred feature of the present invention so that those skilled in the art may better understand the detailed description of the invention that follows. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing or modifying other structures for carrying out the same purposes of the present invention and that such other structures do not depart from the spirit and scope of the invention in its broadest form.
Other aspects, features, and advantages of the present invention will become more fully apparent from the following detailed description, the appended claim, and the accompanying drawings in which similar elements are given similar reference numerals.
The fact that the extrapolation of step edge 12 intersects the opposite sidewall precludes the use of a circular saw to cut the step into the sidewall and restricts the step to be cut using a well-known rotary router type cutter 20 as shown in
As shown in
The manner in which reduction of the step angle allows the groove to be cut using a sequence of six high speed circular saw cuts is shown in
It is not obvious that the groove modification shown in
The manner in which the modified groove mates with a corresponding modified connector to form the spring-loaded split-tongue locking connector system is shown in
The upper left detail in
The sidewall edge 12 is at an angle of s=30° above the horizontal and the associated normal force is therefore 60° below the horizontal. The force acting normal to the side wall edge is denoted by Fn, and the resulting friction force resisting removal of the connector from the groove is denoted by Ft in
Looking now at the forces in the upper right detail in
While there have been shown and described and pointed out the fundamental novel features of the invention as applied to the preferred embodiments, it will be understood that the foregoing is considered as illustrative only of the principles of the invention and not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are entitled.
