Exchangeable work assembly of a screwdriver and the method of using the assembly

Abstract

An exchangeable work assembly of a screwdriver includes a connector partially received in the shank of the screwdriver and including a polygonal block and the polygonal stub longitudinally extending from one end of the polygonal block. The polygonal stub is received in the shank of the screwdriver. A first detaching block has a polygonal hole defined to selectively receive the polygonal block of the connector for detaching the connector from the shank after rotating. A barrel is connected to the polygonal block of the connector and has a polygonal hole defined to receive the polygonal block of the connector. A second detaching block is selectively connected to the barrel and has a hole defined to partially receive the barrel for detaching the barrel from the connector after rotating.

1 . A method of using an exchangeable work assembly of a screwdriver uses the polygonal shape of an element and a polygonal hole in another element, and promotes the friction between the two elements by rotating to make the inner periphery of the hole securely abutting the outer periphery of another element.  
   
   
       2 . An exchangeable work assembly of a screwdriver comprising: 
 a tip with a first end adapted to be longitudinally connected to and partially received in a shank of the screwdriver, and a second end adapted to drive a work piece; and    a detaching block having a hole defined to selectively receive and engaging to the second end of the tip for detaching the tip from the shank of the screwdriver after rotating.    
   
   
       3 . The exchangeable work assembly as claimed in  claim 2 , wherein the hole in the detaching block is polygonal hole and defined to receive the second end of the tip during detaching the tip, the cross-section of the hole corresponds to that of the tip, the hole having an area greater than that of the tip and having multiple sides connected to one another and each being convex relative to the detaching block, the hole being tapered and the enlarged end of the hole facing the tip.  
   
   
       4 . The exchangeable work assembly as claimed in  claim 2 , wherein the tip has an annular groove defined in an outer periphery of the tip and detaching block has a blind hole defined to receive the second end of the tip, the blind hole having a diameter slight greater than a length of each of the diagonals in the tip, the detaching block including two sticks laterally extending through detaching block and partially laterally received in the blind hole wherein a distance between the two sticks is slightly greater than that between two opposite sides of the tip.  
   
   
       5 . The exchangeable work assembly as claimed in  claim 2 , wherein the tip includes multiple edges each having an indentation defined near a middle portion of the tip and the hole in the detaching block has a diameter slightly greater than a length of each of the diagonals of the tip, multiple ratchets formed on an inner periphery of the hole in the detaching block, each corresponding to and selectively engaged to a corresponding one of the indentations.  
   
   
       6 . The exchangeable work assembly as claimed in  claim 2  further comprising: 
 a connector adapted to be partially received in the shank of the screwdriver and including a polygonal block and the polygonal stub longitudinally extending from one end of the polygonal block, the polygonal stub adapted to be received in the shank of the screwdriver;    a first detaching block having a polygonal hole defined to selectively receive the polygonal block of the connector for detaching the connector from the shank after rotating;    a barrel connected to the polygonal block of the connector, the barrel having a polygonal hole defined to receive the polygonal block of the connector; and    a second detaching block selectively connected to the barrel, the barrel having a hole defined to partially receive the barrel for detaching the barrel from the connector after rotating.    
   
   
       7 . The exchangeable work assembly as claimed in  claim 6 , wherein the barrel has a series of notches longitudinally defined in an outer periphery of the barrel and the second detaching block includes a series V-shaped protrusion longitudinally extending form an inner periphery of the hole in the first detaching block, each protrusion complementary to a corresponding one of the series of notches of the first barrel.  
   
   
       8 . The exchangeable work assembly as claimed in  claim 6 , wherein the barrel is cubic and includes four edges each having a cutout longitudinally defined in the outer periphery of the barrel and the hole in the detaching block has a cross-section corresponding to that of the barrel.  
   
   
       9 . An exchangeable work assembly of a screwdriver comprising: 
 a connector adapted to be partially received in the shank of the screwdriver and including a polygonal block and the polygonal stub longitudinally extending from one end of the polygonal block, the polygonal stub adapted to be received in the shank of the screwdriver;    a first detaching block having a polygonal hole defined to selectively receive the polygonal block of the connector for detaching the connector from the shank after rotating;    a barrel connected to the polygonal block of the connector, the barrel having a polygonal hole defined to receive the polygonal block of the connector; and    a second detaching block selectively connected to the barrel, the barrel having a hole defined to partially receive the barrel for detaching the barrel from the connector after rotating.    
   
   
       10 . The exchangeable work assembly as claimed in  claim 9 , wherein the barrel has a series of notches longitudinally defined in an outer periphery of the barrel and the second detaching block includes a series V-shaped protrusion longitudinally extending form an inner periphery of the hole in the first detaching block, each protrusion complementary to a corresponding one of the series of notches of the first barrel.  
   
   
       11 . The exchangeable work assembly as claimed in  claim 9 , wherein the barrel is cubic and includes four edges each having a cutout longitudinally defined in the outer periphery of the barrel and the hole in the detaching block has a cross-section corresponding to that of the barrel.