FI95739C - Double-sided nail plate and method of making it - Google Patents

Description

95 719

Double-sided nail plate and method of making it. Double-sided splinters and frosters for the manufacture.

The invention relates to a double-sided nail plate comprising two opposed plates, both of which have protruding spikes bent from the plate materials, at least some of which are located in holes in the respective plate so that the spikes and holes can transmit shear forces between the plates in different directions by mutual contact pressures. The invention also relates to a method for manufacturing such a nail plate.

A double-sided nail plate is a metal plate generally made of galvanized steel plate with spikes projecting from the plate on both sides of the plate. Structures made using such plates can be given new properties that would otherwise be difficult to achieve. The most important features are the improvement of fire resistance (the connecting members remain under the protection of wooden parts), as well as higher load resistance.

A double-sided nail plate is typically required to have the following characteristics: - the strength properties of the plate must meet the load requirements (shear between the plates) - the plate must have similar strength characteristics on both sides - the plate must be there must be no significant protrusions other than the peaks transferring the loads between the plate and the structure.

Double-sided nail plates are made by welding pins or nails to a steel plate. Such plates are considerably more expensive due to the cumbersome manufacturing technique.

Double-sided nail plates are also made by welding known nail plates back to back. Such plates are expensive because the plates are made of galvanized material and welding of the galvanized plate is cumbersome and expensive.

The plates can advantageously be connected to each other by so-called with stamped rivet. In this case, the protrusion created during stamping prevents the wooden parts from coming into close contact, preventing their fire-protective effect. The joint also cannot withstand perpendicular tensile stress.

The object of the invention is to achieve the properties listed above without said side effects.

This object is achieved on the basis of the features set out in the appended claims.

In the following, the invention will be illustrated with reference to the accompanying drawing, in which Fig. 1 shows a perspective view of a nail plate according to the invention and Fig. 2 shows a section taken therefrom.

The invention uses a technique in which nail plates made of steel plate are joined into a double-sided nail plate by placing two plates 1, 3 opposite each other. Protruding spikes 2, 5 from the sheet material protrude from both plates 1,3. In the case shown, the spikes 5 in the edge areas of the plates 1, 3 are bent in question. to the side of the nail plate on the plate side. In the central region of the plates there are two parallel rows of spikes 2 bent in the opposite direction to the spikes 5, the spikes 3 95739 2 being located in the holes 4 in the opposite plate. 4 can transfer the shear forces generated in all different directions between the plates 1, 3 by means of mutual contact pressures. Correspondingly, the spikes 2 are in each case connected to opposite ends of the parallel punching openings 2a in the same plate (e.g. 1).

The spike 2 piercing the hole 4 is bent over the edge of the hole 4, as shown in Fig. 2, whereby the connection between the plates 1, 3 can also transfer the perpendicular forces applied to it. In the bending of the spikes 2, it is sufficient that the spike 2 is, for example, equal to the material thickness on the edge of the hole 4. In this case, a considerable part of the length of the spike 2 remains for adhesion with the wooden part.

The nail plate according to the invention can be produced in two steps, in the first step single-sided nail plates are made with an intact strip, so that in the second step the above-described spike and hole combination 2, 4 can be made on the intact strip to connect the plates 1, 3 together into a double-sided nail plate. In this case, the nail plates produced in the first step can also be used as single-sided nail plates, the area of use of which thus becomes more versatile.

Claims (3)

1. Double-sided nail plate with two plates (1, 3) arranged against each other, both of which protrude nails (2, 5) of the plate material, of which at least part (2) fits into respective heels (4) of the opposite plate, such that the nails (2) and the heel (4) can, by means of mutual contact pressure, be able to displace in all different directions the created cutting forces between the plates (1, 3), the pitch thereof, that the heel of the opposite plate (4) ) the pierced nail (2) has been bent on the edge of the heel (4) so that the joining between the plates (1, 3) can also displace the applied vertical forces. Nail plate according to claim 1, characterized in that both plates (1, 3) have a first group of nails which have been bent on the side of the questionable plate, and a second group of nails (2) which have been bent through heels. (4) of the opposite plate on the edge of the heel (4) to effect a joint. 3. A process for the manufacture of double-sided nail plates, according to claim 1 or 2, can be characterized in that the manufacture of nail plates takes place in two stages, whereby at the first stage one-sided nail plates are produced, which leave a hot zone and in the second stage, a nail and heel combination (2, 4) is formed on the entire zone to join the plates (1, 3) to a double-sided nail plate.