DE1927065C - Arrangement for attaching a fastening element in at least one workpiece - Google Patents

Description

Exercise the driving force can be kept lower. Once the fastener is driven the tip will be torn off. Only then does the actual spreading occur to form a counter bracket one.

For example, embodiments of the invention are explained in more detail with reference to the drawing.

Fig. 1 shows schematically in section the inventive Arrangement before driving in;

F i g. FIG. 2 is a section taken along line 2-2 of FIG

Fig. 1;

F i g. 3 is a section along line 3-3 of FIG

Fig. 1;

F i g. 4 shows schematically in section the arrangement after driving in and before spreading;

F i g. 5 shows schematically in section the arrangement after spreading;

F i g. 6 shows another embodiment of a

Drive bolts.

With the arrangement shown in the figures, two relatively thin flat pieces 6, 8 made of metal, Wood or the like. Be connected to one another.

The fastening element 2 has a conical tip 10 and converging to a point 12 an expanding flange 14 on its other- »5 Ren end, the flat end face 16 of which runs perpendicular to the axis of the fastening element 2. Between the flange 14 and the tip 10 extends an intermediate section forming the actual expansion sleeve 18 with a cylindrical outer surface which is connected to the tip 10 via a predetermined breaking point 20 is. The fastening element 2 has a central bore 28, the flange-side part 34 of which over an inner shoulder 36 merges into a front part 32, the diameter of which is smaller than that of the flanschseiügen part 34. The front bore part runs in a closed, tapered End 30 in the tip 10, the predetermined breaking point 20 being arranged around the front bore part 32.

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The drive pin 4 consists of a cylindrical portion 38, the diameter of which is that of the Fknsches 14 corresponds. In front of the section 38, the shaft 40 protrudes centrally, its tapering Tip 42 in a front cylindrical part 44 goes over, which over a shoulder 48 with a second cylindrical part 46 is connected, which sits on the portion 38. The diameter of part 46 is larger than that of the part 44, the shaft 40 being designed so that it is in frictional engagement in the Bore 28 of the fastening element 2 is seated.

For driving in a fastening element 2 by hand, the section 38 of the drive pin 4 has a flat end face 50 which is hit with a hammer. When the drive bolt 4 interacts with an internal combustion bolt setting device, the shaft 40 opens into a flange 52, the diameter of which corresponds to that of the piston 54, so that the flange 52 fits into the socket of the internal combustion bolt setting device.

The driving a fastening element 2 is made such that after the placing of a fastening element 2 to the drive bolt 4, the arrangement by pressure force by the flange pieces 6 • · - -1 ... ci _'ncn |, 14 at the upstream

tion by UrucKKrau umm v «~.

and 8 is driven until the flange 14 rests against the front plate piece 6 (FIG. 4). Through more The tip 10 is exerted by force through the engagement of the shaft tip 42 with the bore end 30 torn off at the predetermined breaking point 20, with the flange 14 resting on the I-mat piece 6, the counter bracket forms, and the inner shoulder 48 of the shaft 40 spreads the intermediate portion 18 between the predetermined breaking point 20 and the inner shoulder 36 of the fastening element 2 to the outside, whereby the two plate pieces 6 and 8 between the flange 14 and the expanded intermediate piece 18 are held. The drive pin 4 is then withdrawn, with the tip 10 being stripped off will.

1 sheet of drawings

Claims (2)

ρ ... In a further known bolt. 1. Arrangement for attaching a fastening of the bolt, creating a tubular rivet connection transmission element is caused in at least one workpiece of two workpieces, the BoI-by Driving in from one side, consisting of 5 zen can be canceled at the predetermined breaking point from a fastener that is attached to a. and thereby its end with the one rivet head bün-end one flange and one of the flange side is dig (German patent 661 357). te hole going into the fastener Another known fastener has has, which is at one point to form a tip that is made with the shaft of this element an inner shoulder tapered, and consists of a xo one piece The fastener that Drive bolt that is driven into the hole of the fastening with a nail gun element insertable and with an outer school slot at its tip, making the inside ter which are keyed to the inner shoulder of the hollow bolt after driving Drill hole for spreading the fastening element by driving a wedge into the slot Mentes is engageable, as well as from a 15, thereby reducing the friction of the bolt in the wall interacting with the driving tool is increased and its seat is improved (German Pa-tip for driving in, thus marked 884090). draws that the tip (10) with the fastening element has the disadvantage that transmission element (2) forms a piece, between which the driving is made difficult by the slots. Tip (10) and an intermediate section (18) 20 Finally, there is one more point provided Fastening elements (2) in front of the inner part, which can be driven into a workpiece, are known shoulder (36) a predetermined breaking point (20) is provided running from the tip to the drive-in side is, the bore (32) in the fastener has a slot which ends in a web portion. After (2) The web part tapers towards the drive-in side towards a closed end (30) and the recess provided protruding from the drive pin (4). Driving into a factory Shank (40) is designed so that it takes place at the piece by hammer blows. Subsequently Driving in at the tapered end (30) is also done by hitting the hammer in the the bore rests and before the spreading recess seated part to be driven, for example through the inner shoulder (36) the tip (10) as a nail or screw, the web through the The predetermined breaking point (20) tears off. 30 broke, so that the slotted tip parts 2. Arrangement according to claim I, thereby spreading (USA.-Patent 3 188 905). indicates that the diameter of the This type of fastening has the disadvantage that the shaft (40) adjoining section (38, a permanent in-engagement of the driven 52) of the drive pin (4) the diameter of the fastening part with the flange entered into this part (14) of the fastening element (2) a pin is required. speaks. The object underlying the invention be is therefore to create an arrangement of the type mentioned, with which one from one Piece of existing fastener with a 40, likewise consisting of only one piece, can be driven in in one operation, with after The invention relates to a reusable arrangement for driving in the driving bolts Bringing a fastening element in should at least be without making any changes to it must be carried out on a workpiece by driving in from one side, consisting of a fastening element that 45 This task is performed in the arrangement of the one one end a flange and one of the type described above solved in that the Flange side in the fastener going tip forms one piece with the fastener, Has bore that is at a point under BiI- between the tip and an Zwischenabschnitl tion of an inner shoulder tapers, and one of the fastening element in front of the inner shoulder one Drive bolt, which is provided in the hole of the fastening element 50 predetermined breaking point, the hole in the Mentes insertable and with an outer shoulder connecting element to form a closed can be seen that tapers with the inner shoulder of the hole for the end and that vorstcdas from the drive pin Spreading of the fastening element in the single shaft is designed so that it is engaged when engaged can be brought, as well as from a tool with the driving tool at the tapering end of the bore cooperating tip for the insertion 55 lies and before the spreading through the inner drive. ter tear off the tip at the predetermined breaking point. In such a known arrangement, the expediently corresponds to the diameter Drive bolt in two parts, on the front part of the section adjoining the shaft a tip is attached, the diameter of the flange for the actual insertion of the drive bolt drive (U.S. Patent 2,994,243). This 60 of the fastener. However, the arrangement has the disadvantage that with the This arrangement has the advantage that while The driving tip connected to the pin then cannot be used again of driving the force on the fastening element is when he is in an inaccessible ment mainly in the tapered part Cavity is driven. In addition, the one that is transmitted in the driving direction before the During the entire driving process, the inner shoulder 65 is shoulder. As a result, the fastener in the direction of the spreading, so that when driving in during driving only a very small amount of envy is the result the friction increases and more force is required to expand, d. H. the spreading effect is that becomes. very low, so that due to the lower travel