Device for locking rip fence of table saw

A table saw, comprising:

• a base assembly;
• a table assembly mounted on the base assembly and including a table and a table saw blade;
• a slide mechanism mounted on the table assembly;
• a rip fence assembly moveably disposed at one of three positions on both sides of the table assembly;
• front and rear outer slide members disposed at front and rear ends of the slide mechanism respectively;
• front and rear inner slide members disposed at front and rear ends of the table assembly respectively wherein the front inner slide member is configured to slide in the front outer slide member, and the rear inner slide member is configured to slide in the rear outer slide member;
• a block member secured to a front end of the rip fence assembly and including a channel, an internal receptacle, and a spring biased member disposed in the internal receptacle;
• and
• a lever pivotably, partially disposed in the channel and including a knurled trigger, a projection, a first recess, and a second recess adjacent to the first recess;
• wherein in a locked position, the spring biased member has one end entered the first recess and the projection enters a lengthwise cavity disposed on an outer surface of the front outer slide member;
• and
• wherein in an unlocked position, the spring biased member has one end entered the second recess and the projection clears the lengthwise cavity.