DE7424610U - Plastic dowels - Google Patents

Description

PATENT Attorney DIPL-ING. GERD UTERMANN

71 HEILBRONN POST BOX 1145 Moltkestr. 6 (pick of Deutsche Bank) Parking: underground car park Harmonie «■ (07131) 82828 cable: PATU

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Deutsche Bank Heilbronn: 364364 Handelsbank Heilbronn: 230805 Kreissparkasse Hellbronn: 7001 6 Postscheck Stuttgart: 43016-704

K 7. 22 D

July 18, 197V15

Applicant:

company

Gertrud Knapp,

Plastic injection molding

D-7119

Eichendorffstrasse 18-20

Description:

The invention relates to a plastic dowel with a through Longitudinal slots divided into sections, the shaft sections of which are connected to one another at the lower end during insertion and one for receiving screws, hooks or the like Opening.

Plastic dowels are known in various designs, Most common plastic anchors have in the shaft

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two longitudinal slots arranged opposite one another by 180 ° and are connected to one another at the lower end via a small web.

In such expansion dowels, the guide is a screw screwed into the dowel and the lateral support of the screw in many cases not satisfactory, as this is due to the fact that the shaft is halved by the longitudinal slots arranged opposite one another often no satisfactory support of the screw against lateral evasion is achieved. The ones to fix this In the absence of known dowel designs, complicated and expensive tools are required. Demoulding can only be done with additional effort take place.

The invention is based on the object of a plastic dowel to create of the type mentioned, which causes a good centering effect on the screw, but also on the other hand can be easily and economically manufactured from plastic.

According to the invention, this object is achieved in that the opening is designed as a central bore with a longitudinal section of larger diameter extending from the upper end over the length of a cylinder jacket-shaped neck section and with a longitudinal section of smaller diameter extending over the shaft section, and at the lower end in area of the central bore is provided a closure bottom, and three are respectively provided 120 ° circumferentially distributed Langsechlitze _r which continuously extend from the lower end of the neck portion to the bottom plug end.

As a result of the subdivision of the dowel opening into a longitudinal section with a larger and a longitudinal section with a smaller diameter are favorable conditions for the introduction and Tightening the screw created. Due to the longitudinal slots extending over the entire shaft section and the splaying on three sides due to the 120 ° offset

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th longitudinal slots will have both an early spreading effect as well A good load distribution on three sides on the pressure-absorbing masonry is achieved. The fact that the dowel according to the invention has an end base in the area of the central bore results in a considerably more durable connection of the shaft sections at the lower end compared to the previously common ones Stegen reached. On the other hand, since the longitudinal slots are provided continuously to the lower end, it is inexpensive and thus economical production possible.

In an advantageous embodiment of the invention it is provided that J the transition between the longitudinal section with a larger diameter and the longitudinal section with a smaller diameter is conical designed section is. This measure is of advantage in terms of production technology and for screw guidance.

According to a further feature of the invention, the shaft of the plastic dowel is designed to be essentially cylindrical. as It has proven expedient to design the lower end of the shaft to be conically tapered, which in turn, both in terms of production engineering and when the dowel is used for insertion into the dowel hole is advantageous.

The outer contour of the shank can have grooves running in the longitudinal direction and / or arranged transversely to the longitudinal direction of the dowel Have ribs.

Finally, provision can be made for anti-rotation locks designed in a ^{manner known per} se to be provided at the upper end.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings. Show it:

Fig. 1 is a side view of an embodiment of the invention

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proper plastic dowels;

Flg. 2 shows a longitudinal section through the one shown in FIG Plastic dowels;

3 shows a section along the line III-III in FIG. 2;

FIG. 4 shows an end view of the dowel shown in FIG. 1 seen from the upper end;

5 shows the side view of a further exemplary embodiment of the plastic anchor according to the invention »

The plastic anchor shown in Fig. 1 in side view has a neck portion 2 having in the vicinity of the upper end 3 angebrachtlni ^{envy /} 4 anti-rotation-like design, which are each offset from one another by 120 °. A shaft part 6 provided with transverse ribs 5 adjoins the neck part 2. The neck part 2 and the shaft part 6 are essentially cylindrical. The shaft part is conically tapered in the vicinity of the lower end 7 of the dowel (bevel 8). In the interior of the dowel there is an opening 9 extending from the upper end 3 to the lower end 7 and intended to receive a screw, a hook or the like Shank section 6 has a longitudinal section 9b with a smaller inner diameter. The transition 9c between the longitudinal section 9a and 9b is conical. The plastic dowel has an end base in the vicinity of its lower end 7 in the area of the central bore 9. Furthermore, in the area of the shaft part 6 there are three longitudinal slots 11 distributed around 120 ° over the circumference, which extend into the lower area 2a of the neck part 2 and are continuous in the area of the lower end 7 in the longitudinal direction of the dowel.

The plastic dowel 1a shown in Fig. 5 has near its

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nes upper end 5a has a continuously cylindrical neck part 2b, so it is not provided with special anti-rotation devices. The neck part 2b has a slightly smaller outer diameter than the shaft part 6a _t which is provided with grooves 12 arranged in the longitudinal direction. The arrangement of the longitudinal slots 11, the end base 10 and the design of the central bore 9 corresponds to the arrangement shown in FIGS. The neck part 2b can, however, also have the same diameter as the shaft part 6a. The grooves arranged in the longitudinal direction can also be carried out up to the upper end 5a. Anti-rotation locks can also be provided on the neck part of a dowel with longitudinal grooves.

A particular advantage of the plastic dowel according to the invention is that the longitudinal slots can be easily removed from the mold 11 forming tools as a result of the longitudinal slots extending continuously to the lower end of the dowel 7 in the axial direction Direction can be done.

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Claims (7)

PATENT Attorney DIPL-ING. GERD UTERMANN 71 HEILBRONN-POSTFACHIMS Moltkestr. β (Haue der Deutsche Bank) Parking: underground car park Harmonie 9 (07131) 62828 cable: PATU use smu st er anmeldunp; Deutsche Bank Hollbronn: 364364 Handelsbank Heilbronn: 230805 Kreissparkasse Heilbronn: 7001 6 Postscheck Stuttgart: 43016-704 K 7. 22 D July 18, 1974/15 Applicant: Gertrud Knapp, plastic injection molding D-7119 Inge! Fingen Eichendorffstrasse 18 -20 Designation: Plastic dowel Protection claims: 1. Plastic dowel with a shaft divided into sections by longitudinal slots, the shaft sections of which at the bottom Ends are connected to each other during insertion, and one for receiving screws, hooks or the like. opening extending from the upper end into the interior of the DUbel, characterized in that K 7. 22 D 7 '. ::. ·' .. '11.7.74 / 5 · .. · λ Ζ -: the opening (9) as a central bore with one of the upper end (3 »3a) extend over the length of a cylinder jacket-shaped neck section (2, 2b)" the longitudinal section (9a) of larger diameter and with one extending over the shaft section (6, 6a) Longitudinal section (9b) of smaller diameter is formed »and at the lower DUbelende (7) in the area of the central bore (9) an end base (10) is provided, and three longitudinal slots (11) each distributed by 120 ° over the circumference are provided, each of which extends continuously from the lower end (2a) of the neck section (2, 2b) to the lower end of the DU (7). 2. Plastic anchor according to claim 1, characterized in that the transition between the Longitudinal section (9a) with a larger diameter in relation to the longitudinal section (9b) with a smaller diameter is a conically shaped section (9c). 3. Plastic dowel according to claim 1 or 2, characterized characterized in that the shaft (6, 6a) is designed substantially cylindrical. 4. Plastic dowel according to claim 3, characterized in that the shaft at the lower end has a conically tapered section (S). 5. Plastic dowel according to one of claims 1 to 4, characterized in that the shaft part (6a) on the outside in the longitudinal direction arranged grooves (12) having. 6. Plastic dowel according to one of claims 1 to 5, characterized in that the shaft 74246101010.74 K 7. 22 D 11.7.74 / 5 part (6) has ribs (5) arranged on the outside in the transverse direction. 7. Plastic dowel according to one of claims 1 to 6, characterized in that in the vicinity of the upper end (3) on the neck part (2) blade-like anti-rotation devices (4) are provided. 7424610 io.io.74