Patent Publication Number: US-2020277979-A1

Title: Screw comprising associated screwdriver or bit

Description:
FIELD OF THE INVENTION 
     The invention relates to a screw having an associated screwdriver or bit. 
     Prior Art 
     DE 20 2007 016 004 U1 has disclosed screws with different screw heads, for example with a slot, a cross slot, a Torx head or an Inbus head. In order for it to be possible for said screws to be screwed into or out of a workpiece, four different screwdrivers or bits are required which fit into the different screw heads. 
     OBJECT OF THE INVENTION 
     Proceeding from said prior art, the invention is based on the object of providing a screw of the type mentioned at the outset, the screw head of which screw is designed in such a way that the screw can be screwed in or out by way of most of the known screwdrivers or bits, namely a slot, a tamperproof slot, a cross slot (Phillips), a Torx head, a square drive (Robertson), a hexagon socket (Inbus), a Torq-set, a Pozidriv head or a Spanner head. 
     Achievement of the Object 
     Said object is achieved by way of a screw having the features of the characterizing part of claim  1 . 
     Further advantageous refinements of the invention are indicated in the subclaims. 
     Advantages of the Invention 
     The advantages which are achieved by way of the invention consist, in particular, in that the screw can be screwed in and/or out by way of most of the standardized screwdrivers or bits. A further advantage consists in the high drive force on the contact faces between the screw and each of said screwdrivers or bits, even if smaller sizes of screwdrivers or bits are used. 
    
    
     
       DESCRIPTION OF THE INVENTION 
       One exemplary embodiment of the invention is shown in the drawing and will be described in detail in the following text. 
       In the drawing: 
         FIG. 1  shows a view from above of a screw head in accordance with the invention, 
         FIG. 2  shows a perspective sectional drawing of the screw head on an enlarged scale, 
         FIG. 3  shows a perspective view of one quarter of a negative impression of the screw head, 
         FIG. 4  shows a perspective view of that quarter of the negative impression of the screw head which lies next to the quarter in  FIG. 3 , 
         FIG. 5  shows a perspective view of the one half of the negative impression of the screw head, and 
         FIG. 6  shows a perspective view of the complete negative impression of the screw head. 
     
    
    
       FIG. 1  shows a view from above of a screw head in accordance with the invention which is shown in  FIG. 2  as a perspective section on an enlarged scale. 
       FIGS. 3 to 5  in each case show two different quarters and one half of the screw head, to be precise as a negative impression which is obtained when the screw head is filled to the brim with a curable casting compound and the latter is removed after curing. In this way, the course of the various faces can be seen in an improved manner, in particular if said negative impression is halved and quartered.  FIGS. 3 and 4  in each case show two quarters which lie next to one another and are shown in  FIG. 5  as one of the two identical halves. The quarters which in each case lie diagonally opposite one another are identical to one another. 
     When the figures are considered, it can be seen clearly that the screw head is configured in such a way that there are contact faces which are sufficient for the transmission of the torque from the screwdriver or the bit to the screw head for screwdrivers with most bits, namely with a slot, a tamperproof slot, a cross slot (Phillips), a Torx head, a square drive (Robertson), a hexagon socket (Inbus), a Torq-set, a Pozidriv head or a Spanner head. 
       FIG. 6  indicates letters which relate to measurements, the ratios of which to one another are identical for all standardized screw sizes, to be precise as follows: 
     b=0.813 a
 
c=0.250 a
 
d=0.125 a
 
e=0.188 a
 
f=0.238 a
 
g=0.200 a
 
h=0.563 a
 
i=0.475 a
 
m=0.150 a
 
n=0.163 a
 
o=0.175 a
 
p=0.263 a
 
q=0.288 a
 
u=0.213 a
 
y=0.338 a
 
     A further special feature consists in that screwdrivers or bits with the next smaller standard size, or else with even smaller standard sizes in the case of some screw types, also fit with sufficient rotary force into a screw head of a certain standard size, as indicated in the following tables for screws of the sizes T 40 and T 25. 
     
       
         
           
               
               
             
               
                   
                   
               
               
                   
                 The following screwdrivers 
               
               
                   
                 with smaller sizes fit 
               
               
                   
                 for a screw of the size 
               
               
                   
                 T 40 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                   
                 Torx 
                 T 35 
                 T 30 
                 T 27 
               
               
                   
                 Cross slot (Phillips) 
                 PH 4 
                 PH 3 
                 PH 2 
               
               
                   
                 Pozidriv 
                 PZ 3 
                 PZ 2 
               
               
                   
                 Hexagon socket (Inbus) 
                 H 5 
               
               
                   
                 Square drive (Robertson) 
                 S 4 
                 S 3 
               
               
                   
                 Slot 
                 1.2 × 7 
                 1 × 6.5 
                 1 × 6 
               
               
                   
                 Torq-set 
                 10 
                 8 
               
               
                   
                 Tamperproof slot 
                 C 3 
                 C 2 
               
               
                   
                   
               
            
           
         
       
     
     
       
         
           
               
               
             
               
                   
                   
               
               
                   
                 The following screwdrivers 
               
               
                   
                 with smaller sizes fit 
               
               
                   
                 for a screw of the size 
               
               
                   
                 T 25 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 Torx 
                 T 20 
                 T 15 
                 AZ 25 
                   
               
               
                   
                 Cross slot (Phillips) 
                 PH 3 
                 PH 2 
                 PH 1 
               
               
                   
                 Pozidriv 
                 PZ 2 
                 PZ 1 
               
               
                   
                 Hexagon socket (Inbus) 
                 V 1.8 
                 S 3 
                 K 3 
               
               
                   
                 Square drive (Robertson) 
                 R 3 
                 S 1 
               
               
                   
                 Slot 
                 5.5 
                 5 
                 4.5 
                 4 
               
               
                   
                 Torq-set 
                 8 
                 7 
                 6 
               
               
                   
                 Tamperproof slot 
                 C 1