Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1983-04-06
1984-08-21
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428179, 428332, 428600, B32B 300, B32B 330
Patent
active
044670087
DESCRIPTION:
BRIEF SUMMARY
It is previously known to increase the stiffness in wood constructions joined together by bolts by inserting metallic elements between the wood parts, which elements on both sides are provided with a plurality of points, which are forced into the wood parts to a considerable depth. Elements of this type are not suitable for demountable constructions, since the surfaces of the construction parts are damaged by repeated demounting. The mentioned elements can neither be used for constructions of material having hard surfaces, which cannot be penetrated by the points, as for instance metals, or materials which should be subjected to cracks or burstings when penetrated by the points, as for instance hard plastic materials and ceramic materials. For such constructions it is previously known to use metallic elements which are bent in such a way at their periphery or at the edge of apertures being punched out that the bent parts form resilient tongues. When the construction parts are forced against each other, the corners or the edges of the resilient tongues are pressing against the construction parts with a force dependent on the stiffness of the tongues. These elements, however, do not function very well for hard construction parts, since said tongues only rest against the construction parts without penetrating the same. Therefore, there has been a strong desire in the market for an element, which shall hold not only construction parts made of soft material, as for instance wood, but especially construction parts made of hard material, as for instance steel.
The present invention is intended to satisfy these desires and hereafter shall be described more closely.
The invention constitutes a frictional element, which is produced by etching thin strips or sheets of material, which is hardened or is capable of being hardened. In this connection the production occurs in the following way (FIGS. 1-3).
A strip 1 is on both sides covered by "screen-printing", another printing method or in a photographic way with a colour according to a certain pattern, which colour prevents etching, the patterns being so adapted that a covered area 2 on one side always corresponds to an uncovered area on the other side (FIG. 1). The strip is etched on both sides by spraying with or immersion into an etching liquid, for instance ferrous chloride dissolved in water, the surface layer of the strip being removed in the areas that are not covered by colour. The etching depth is made equal on both sides of the strip by symmetrical arrangement of the etching device or by adapting the conditions of spraying. A certain etching occurs also under the colour on the covered parts, the width of which shall be so large that parts of the original surface of the strip remain after etching, undercut, flat pointed teeth 3 or teeth having the form of flat pointed cones, wedges or pyramids being received. After the etching the colour layer is removed, whereafter frictional elements of desired form can be cut or punched out from the strip (FIG. 2). These frictional elements, if wished, can be given an increased hardness by hardening, chromium-plating or another hard metallic layer.
When applying an element between two construction parts 4, 5, which are forced together against flat outer faces 8 of the teeth 3, the thin part or deformation section 6 of the element will be bent so that the compressive force against every standing pattern detail is distributed over a substantially larger, smooth surface portion 7 on the opposite side of the strip (FIG. 3). Due to that fact considerable shearing forces can be transmitted without giving dangerous concentrations of flexural tensions in the frictional element and with a minimal mutual movement between the construction parts.
The frictional element has the following advantages in relation to previously known technics:
1. The points can be very closely located so that the power transmission is distributed on a large number of points, the penetrating depth of which can be made small. Due to that fact the damages on t
REFERENCES:
patent: 2099273 (1937-11-01), Myer
patent: 2811108 (1941-06-01), Whalen
patent: 3961104 (1976-06-01), Tanner
patent: 4264410 (1981-04-01), Frantzen
patent: 4268564 (1981-05-01), Narashiman
Santrade Ltd.
Thibodeau Paul J.
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