Striking device of a power tool

Abstract

A striking device of a power tool includes a striking room, two striking blocks and a transmission shaft. The striking room has a pivotal restricting groove at its two sides respectively, and two supporting surfaces formed adjacent to two sides of the pivotal restricting groove. Each striking block has a projected pivot formed axially, pivotally installed between two pin holes of the striking room via two pins. Two sides of the projected pivot are extended with striking portions, and the transmission shaft has two restricting blocks provided with a struck segment and a displacing segment. When one of the striking portion strikes one of the struck segments, the other of the striking portions just leans on the supporting surface to activate the transmission shaft to rotate. When the striking portion moves away after striking, it passes through the corresponding displacing segment to carry out next strike.

1 . A striking device of a power tool, said power tool provided with a striking set installed in its front portion, said striking set comprising:
 a striking room provided with an accommodating space, an opening bored at a center of its upper and lower wall respectively, and a pivotal restricting groove dug vertically in an inner surface of its two sidewall respectively, two supporting surfaces formed as an arc and next to two sides of each of said pivotal restricting grooves, two pin holes bored correspondingly in said upper and said lower wall and located at an axial center of each said pivotal restricting groove, a shift block pivotally fitted in said opening of said lower wall and provided with two engaging members located on a circumference of its upper edge;   two striking blocks respectively provided with a projected pivot formed integrally along their axial central portion, said projected pivots respectively provided with an engaging tail formed at a bottom for engaging with said engaging member, each said projected pivot having its top and bottom pivotally matched with said pin holes of said striking room by being fitted with pins, said projected pivot having its outer surface formed as a pivotal restricting surface to engage pivotally with the pivotal restricting grooves so as to swing bias by pivoting on said pins, a striking portion shaped as an arc to match with that of said supporting surface and extended from two sides of said projected pivot respectively, said striking portions located alternately without interfering with each other; and   a transmission shaft provided with a pivotal engaging portion formed in its intermediate portion with a larger diameter for fitting in said opening of said upper wall of said striking room, a lower shaft extended downward from a bottom of said pivotal engaging portion to be located inside said striking room, and two restricting blocks formed integrally to be located axially and symmetrically around said lower shaft through to its bottom, each said restricting block provided with a struck segment and a displacing segment that are positioned up and down alternately so that one of said striking portions of said striking blocks can rotate with a preset angle in said striking room to hit corresponding said struck segments and the other said striking portion just contacts with said supporting surface to activate said transmission shaft to whirl, said striking blocks then rotating with a preset angle to enable said striking portion of said striking blocks to move away from said struck segment and pass through said displacing segment to carry out next striking, said striking blocks activated by said displacing blocks to rotate with a preset angle so as to hit again said restricting block of said transmission shaft to keep said transmission shaft rotated.   
   
   
       2 . The striking device of a power tool as claimed in  claim 1 , wherein said struck segments are shaped protrudent and said displacing segments are shaped concave, so that said striking blocks can correspondingly strike said struck segments and then pass through said displacing segments to carry out next striking, each said displacing segment of said restricting blocks provided with a guiding corner that is used to keep said striking block move away from said restricting block easily, so that said striking block can be activated by said shift block to turn around with an angle of 360° to hit said restricting block of said transmission shaft again to drive said transmission shaft to rotate. 
   
   
       3 . The striking device of a power tool as claimed in  claim 1 , wherein said projected pivot of each said striking block possesses a broad inner thickness, said projected pivot has a positioning hole bored at its top and bottom to correspond to said pin holes of said striking room, said positioning holes are bored partly in said projected pivots and letting said pins insert from said pin holes through therein, so as to keep said striking blocks installed between said pin holes and inside said striking room.