DE2319122A1 - FLAT KEYS, IN PARTICULAR FOR MOTOR VEHICLES - Google Patents

Description

Flat keys in particular for motor vehicles The invention relates on a flat wrench in the shape of a hammer, especially for motor vehicles mirror image of the same profile on both flat sides. Such keys will be Called Wendesciilüssel because they are in a slot that corresponds to the length of the slot Position inserted into the channel profile of the lock and in the same position after turning around 1800 Way can be inserted into the I.analprofile of the lock, as the profiles on the two flat sides of the key and the notches on the other two Sides of the key are arranged symmetrically to each other, the previously known and the reversible key used was made from three parts: the actual one Key with the key shaft with the stop and the head in the shape of a hammer, made of steel, a plastic head, in the the Key has been inserted with the key shaft first until the hammer head is in the Found a stop inside the plastic head, and one in the plastic head after the actual key is inserted slide, which is used to lock the three parts clicked into place in the plastic head.

Such keys had the disadvantage that they were made of brittle key material had to be made that could easily break off if handled inappropriately.

Furthermore, the longitudinal grooves in the key material had to be in order to create the key profile to be made in milling operations. The result was a very high one Cutter consumption and, after replacing the cutter, laborious machine setting work. For this reason, the key profile had to be granted corresponding tolerances will. Since the key material was nickel-plated after the profile milling, they were subsequently produced keyhole notches without nickel protection and the nickel layer the flat sides, injured by the notching, can easily peel off and cause defects lead in the key channel. In addition, the keys used so far had the disadvantage that a relatively large amount of material was required for a key, that the whole key consisted of several parts and to assemble and manufacture too much manufacturing and assembly time was required.

The object of the present invention is the production of such To simplify and reduce the cost of keys, the same from less To produce material and use fewer parts for their production. In the end It is also the object of the invention to simplify the assembly of the key and to make it more economical. These objects are thereby achieved by the invention solved that the key shaft with the hammer-shaped head from a grooved drawn profile corresponding to the width of the hammer head and made with the hammer head in a key head, preferably manufactured by die casting is used. The key head itself is made of aluminum or zinc die-cast with a pre-cast profile hole intended for guiding the hammer head. By using die-cast aluminum or zinc for the key head it is also possible to use the hammer head with less lateral expansion than before and to use a drawn material, drs the width from the outset of the hammer head, so it has smaller widths than before used material.

In the rest of the hammer head can have incisions on both sides, in after inserting the hammer head into the wrench head material of the same is pressed in to prevent the hammer head from being pulled out of the wrench head to back up.

To reduce the risk of an accident if the driver bumps into the key -ZU, the key head can be rounded and have a predetermined breaking point.

In the drawing, a previously used key is shown first and compared to a key according to the invention shown. Show it .

Fig. 1 parts of a previously used key, Fig. 2 shows a section of the profile drawn from stainless steel used for key production with drawn Limits for the material to be punched, Fig., The actual punched key and the key head in an exploded view, FIG. 4 the fully assembled Key.

The keys used so far were in accordance with Fig. 1 from three parts composed, the proper key 1 made of brittle metal with the shaft 2 and the hammer head 3.

For the actual key, a relatively wide, the width of the lamb head 3 corresponding N-material can be used. @ Aside from that two grooves 4 had to be milled into the Scliaft on each side. By the pressure that must necessarily be applied to the key scales during milling It was easy to cant, which led to inaccuracies in the key production led.

The finished key 1 was then with the shaft 2 first in a plastic head 5 pushed in until the hammer head 3 on the wall 6 of the plastic head 5 found a stop. In the same slot on the plastic head 5, into which the key 1 has been inserted, becomes the same after it has been inserted the slide 7, which has the same thickness as the key 1, is also inserted. Of the Slider 7 has lugs 8, which are provided in corresponding inside the plastic head 5 Snap 9 into place and thus hold the three parts together tightly.

It is particularly disadvantageous in the production of the be @ annten key the placement of the grooves 4, the necessary width for the raw material of the key, the large number of individual parts used and the relatively complex assembly and the number of parts required.

According to the invention, the key is made from a drawn profile material 11 manufactured. From the outset, this material has that in FIG. 2 in cross section 12 visible profile that even after finishing the entire key in the same Form is used for the finished key.

The parts 13, 1-, 15 have now been removed by punching so that the Form 16 of the key shown in FIG. 3 remains. This key shape also has the required hammer head 17, which is pre-cast in a corresponding one Slot 18 of the key head 19 is inserted, which is made of Ziiff or cast aluminum is made. After the hammer head 17 and key head 19 have been pushed together the key shown in FIG. 4 is produced. This still has indentations 21 on, by pressing the material of the key head 19 into the recesses 14 and 15 has been pressed in, which ensures that the hammer head 17 can no longer be pulled out of the slot 18.

This eliminates the need for profile milling in the manufacture of the key. The profile can be made with greater accuracy getting produced. Since the key is made of stainless steel, there is no need for a surface treatment and thus an inaccuracy caused by galvanic impact. As a result of that the hammer head can be kept narrower than in the previously patented type of Key, there is also less waste material.

To reduce the consequences of accidents, the key head can be rounded as desired and have a predetermined breaking point.

The hammer head Icnnn can also be coated with plastic so that this then forms the key head.

Claims (5)

Expectations 1. Hammer-shaped flat key, especially for cylinder locks of motor vehicles with a mirror image of the same profile on the two flat sides, d a d u r c 11 g e -k e n n n z e i c h n e t that the key shaft (16) with the hammer-shaped head (17) made of a grooved, the width of the hammer head (17) produced corresponding profile and with the hammer head (17) in one, preferably The key head (19) produced in the die-casting process is used. 2. Flat key according to claim 1, d a d u r c 11 g e -k e n n z e i c h n e t that the key head (19) made of die-cast aluminum or zinc with pre-cast profile slot intended for the introduction of the hammer head (17) (18) exists. 3. Flat key according to claims 1 and 2, d a d u r c h g e it is not indicated that the hammer head (17) has incisions (i'i, 15), is pressed into the material of the key head (19). 4. Flat key according to claims 1 to 3, d a d u r c h g e It is not shown that the key head (19) is rounded and has a predetermined breaking point Has. 5. Flat key according to claims l to 4, d a d u r c h S e k It is noted that the hammer head (17) is overmolded with plastic in this way is that this then forms the key head (19).