Patent ID: 6155145
Filing Date: 2000-12-05
Classification: B25B

Abstract:
A screw driving apparatus for use with a screw bit capable of receiving a screw having a head, comprising:a drive shaft having a ring;a first coupling member having a top surface, a first bore at a first end slidably receiving said drive shaft and a second bore at a second end, a first indent and a second indent formed in the second end of said first coupling member;a second coupling member forming a rod at a first end that is slidably received by the second bore of said first coupling member and a bore at a second end for receiving the screw bit;a first cylinder slidably receiving said drive shaft, said first cylinder having a first end connected to the ring of said drive shaft and a second end with first and second through-holes;a second cylinder slidably mounted about said second coupling member and having through-holes;a first spring positioned about said drive shaft, the spring having a first end positioned against the ring of said drive shaft and a second end positioned against said first coupling member;a first collar connected to the first cylinder and forming a space therebetween, said first collar having a ledge;a second spring located within the space formed between said first collar and said first cylinder and positioned against the ledge of said first collar;a washer slidably mounted about said first cylinder within the space formed between the first cylinder and the first collar, said washer positioned against said second spring;a first sleeve slidably mounted about said first cylinder adjacent said washer and having a channel and a gutter;a second sleeve slidably mounted about said second cylinder adjacent said second collar and having a trench;a second collar mounted about said second sleeve and connected to said first sleeve;a first ball mounted in the first through-hole of said first cylinder for operatively engaging the top surface of said first coupling member and the gutter of said first sleeve;a second ball mounted in the second through-hole of said first cylinder for operatively engaging the first and second indents of said first coupling member and the channel of said first sleeve; and,a third ball mounted in the through-hole of said second cylinder for operatively engaging the head of the screw and the trench of said second sleeve.