DE511765C - Riveted connection for fastening objects in blind holes - Google Patents

Description

Efforts by technology to find a riveted joint that works well in blind holes creates an insoluble connection, have led to a wide variety of rivet shapes (notched nail, Screw or twist rivets). Except for those already on the market Some riveting methods are also known, but they are just like the aforementioned Form rivets have not led to a satisfactory result.

For example, it is known to force the rivet shaft into the rivet hole to press between To reach rivet shaft and perforated wall. For this purpose the rivet is on his hollowed out lower end; this hollow meets when driving the rivet at the bottom of the hole on a ball previously introduced into the same, which penetrates into the rivet shaft cavity thus creating tension between the rivet shank and rivet hole. However, since the ball is in the The rivet shaft cavity only has line contact, so it can only be done on this contact ring a tension arise. The so narrowly limited tension between the rivet shaft and However, the perforated wall can never achieve so great an adhesion that an insoluble one Riveted connection can be spoken. Such a driven rivet can from the Rivet hole can be pulled out again. The novelty of the riveted connection is that that the free end of the rivet shank is a spherical or similarly shaped extension owns that when hitting the undercut The bottom of the hole penetrates into the rivet shaft and thickens it so that the recess at the bottom of the hole is completely filled. The new riveted connection is in the drawing clarified in more detail.

It shows in section:
Fig. Ι the pre-drilled rivet hole,

Fig. 2 the rivet hole with the screwed-in undercut groove,

Fig. 3 the expansion rivet inserted into the prepared rivet hole,

Fig. 4 how the rivet shaft expands,

Fig. 5 the finished riveted connection with the filled groove.

Fig. 6 shows the expansion rivet in perspective.

Fig. 7 shows the punch in the view,

Fig. 8 like the punch on the bottom of the hole on meets

Fig. 9 the punch at work.

First, the rivet hole is drilled according to the diameter of the rivet shaft α (Fig. Ij, in such a way that the rivet can be inserted into the hole without hammering. This is necessary in order not to impair the expansion effect from the outset Make sure that the rivet hole (Fig. 1) is drilled shorter than the rivet shank length, which corresponds to about 30 to 40% of the rivet shank diameter (Fig. 3) Milled groove (Fig. 2). For this purpose, the piercer (Fig. 7) has an eccentrically mounted tip e on its shaft end, which is centered in the funnel tip when it hits the bottom of the hole (Fig. S) Cutting edge f is pressed against the wall of the hole (Fig. 8) and thus performs a cutting work (Fig. 9). The new rivet α is inserted into this prepared hole (Fig. 2) (Fig. 3). Now the rivet is inserted with the Anvil driven into the rivet hole, the shank tip b penetrating the rivet shank α by hammer blows in such a way that the rivet shank thickens at this end (Fig. 4) and fills the previously milled undercut groove (Fig. 5).

Claims (1)

Claim: • rivet connection for fastening objects in blind holes, characterized in that the free end of the rivet shaft (a) has a conical or similarly shaped extension (δ) which penetrates the rivet shaft when it hits the undercut hole base and thickens it so that the The recess at the bottom of the hole is completely filled. 1 sheet of drawings