Quick clamping vice structure for circular saw

A quick clamping vice structure for a circular saw comprising a vice seat, a fixed seat, a screw rod, a seat member, a base and an electric saw, wherein:

• said vice seat is disposed in opposition to said fixed seat and is combined with said base, said vice seat is connected with said screw rod, while said screw rod is connected with said seat member, said vice structure is used to movably clamp firm a workpiece in position, said electric saw is provided on said base, said vice structure is characterized by that:
• said seat member has a receiving chamber with an elastic member therein to abut against a screw guiding block, and an engaging groove is provided on the lateral wall of said screw guiding block, an engaging portion is provided on the bottom of said screw guiding block, a hole is provided on said seat member and extending through said receiving chamber for mounting therein said screw rod;
• and said engaging portion on the bottom of said screw guiding block is cooperatively arranged with said screw rod, a through hole is provided nearby said hole on said seat member and is communicated with said receiving chamber, a shifting rod is provided in said through hole of which the front end is provided with an engaging block which is abutted against said engaging groove on the wall of said screw guiding block, so that said vice structure has an effect of quick clamping and positioning as well as stable and firm clamping.