DE1925198U - SCREWDRIVER FOR PHILLIPS SCREWS. - Google Patents

Description

Patent attorney R Ä. 3 5 3 1 Ö3 * "8th 7. 65

r! -A. Bros®

Dip '-Ing,

Munich-PuHach

't «) frSiT.2.-T®l.Munich 790570

W / Hs Munich-Pullach, July 2nd, 1965

GKN SCREWS & FASTENERS LIMITED, Heath Street, Birmingham 18, Warwickshire, England

Screwdriver for cross-head screws,

(2nd separation from the utility model file number P 16 554 / 47a Obm)

The innovation concerns a screwdriver for cross-head screws, consisting of a middle piece from which four radial wings extend.

Such screwdrivers are already known, but they do not guarantee precise and coherent engagement, since the torque that can be achieved when screwing in the screw is also dependent on this precise engagement. The screw is mostly screwed in with the aid of mechanically driven screwdrivers, which in turn increases the demands on the accuracy of the engagement of the screwdriver in the cross-slot-like recess in the screw head. _:

When pressing the cross slits of cross slotted screws, a "fall off" occurs in the side walls of the cross slits of the material that causes these wall parts evade the shaping surfaces of the tool to the outside. As a result of this appearance is a more accurate and conclusive engagement of the well-known screwdrivers

not guaranteed, so that a sliding out of the same from the cross slot is favored. Besides, through it the torque that can be transmitted to the screw is considerably reduced. Attempts have been made to »remedy this disadvantage by increasing the number of seat braces, and the middle one The protrusion of the screwdriver, like the corresponding recess in the screw head, became proportionate in the manner of a pointed cone. In such known screwdrivers and screws there was an additional one Valley between the individual slots of the screw, however, when a valley was formed the screw in the shape of a truncated cone cutout that Screw material displaced only radially outward during manufacture, and the aforementioned drop in the material of the This screw could not be removed, which is appropriate Disadvantages for inserting the screwdriver. This also turned out to be complicated in some cases Shapes for the screwdriver.

The innovation is based on the task of designing a screwdriver of the type mentioned in such a way that it can be used for Insertion of screws is suitable, which prevents falling of the material on the side walls of the slots do not show, and which avoids the disadvantages mentioned.

To solve this problem is according to the innovation in a Phillips screwdriver of the type mentioned is provided that between two wings. ^ On the middle piece a cross-sectionally V-shaped lip is arranged, the side surfaces of which face downwards and towards the screwdriver axis extend inclined at an angle corresponding to an angle of inclination of a line of a valley, and at Insertion into the cross recess in the valleys between the

Engage single slots of a corresponding screw. In this case, the side surfaces of the V-shaped ribs can intersect on a line that connects with the Screwdriver axis forms an angle between 1o and 15 °, and the ribs can terminate just before the lower end of the associated wing. A designed like this Screwdriver not only ensures a safe and secure reliable engagement in the recess of the screw and thus a transmission of a high torque »but also has a long service life, especially since the additional ones V-shaped ribs effectively reinforce the cross-section of the screwdriver especially in the zone of highest stress.

Further advantages and details of the invention result from the following description of two exemplary embodiments with reference to the drawing. In this show!

FIG. 1 shows a side view of the tip of a screwdriver according to the invention;

Figure 2 is a front view of the screwdriver of Figure 1;

Figures 3 and 4 are a side and front view of parts of the tip of an innovation according to the invention Screwdriver.

The screwdriver illustrated in Figures 1 and 2 consists of a shaft 6o with a tip 61, which four shows substantially radially extending projections arranged at an angle to one another, -the; from the middle part 63 to the outside

The screwdriver illustrated in FIGS. 3 and 4

Flight1-passes from a shaft 80 with a point 81, which has lateral surfaces 73 and 74 of the ribs 75. the Ribs 75 end in this embodiment in contrast to the previous jvqr of the tip 83.

Claims (3)

RA. 353103-8.7.65 PROTECTION CLAIMS 1. Screwdriver for cross-head screws, consisting of a middle piece from which four radial wings extend, characterized in that between each two hills (81) on the middle piece a cross-sectionally Y-shaped lip (75) is arranged, the side surfaces of which downward and to the very screwdriver axis at an angle of inclination corresponding to a line of a valley Inclined angles, and when pushed into the cross slot in the valleys between the individual slots engage a corresponding screw. 2. Screwdriver according to claim 1, characterized in that the side surfaces (73, 74) of the V-shaped hips (75) cut on a line that forms an angle between about 10 ° and 15 ° with the screwdriver shaft includes. 3. Screwdriver according to claim 1 and 2, characterized in that the ribs (75) in front of the lower end of the associated wing expire (Figure 3j Figure 4).