Patent ID: 8556243

Claim:
A bar clamp comprising: a slide bar; a movable housing slidably mounted on the slide bar and comprising a movable jaw carrier including a first jaw at one end, a handgrip extending opposite to the movable jaw carrier, and a trigger handle pivotably disposed in the movable housing; a housing member releasably mounted on a forward end of the slide bar and comprising a fixed jaw carrier and a second jaw at one end of the fixed jaw carrier; and a fastening device comprising a through hole formed through the fixed jaw carrier; a cylindrical urging assembly disposed through the through hole and including a first member having a lengthwise first groove, and a second member having a lengthwise second groove, the second member being a mirror of the first member and spaced from the first member by a gap; and a cam assembly including two arc members wherein one arc member is formed besides one end of the through hole and the other arc member is formed between the other end of the through hole, and a cam member including two spaced, opposite cam rings each having a first portion and a second portion opposing the first portion and larger than the first portion, and a lever formed with the cam rings, wherein each cam ring has an eccentric outer surface, the cam member is put on projecting portions of the first and second members with the cam rings being pivotably contacted the arc members, in an inoperative position the first portions of the cam rings are lockingly engaged with the arc members to allow a slide bar of another bar clamp to freely pass through the first and second grooves, and a clockwise pivotal movement of the lever from the inoperative position lockingly engages the second portions of the cam rings with the arc members by drawing the first member toward the second member, thereby fastening the slide bar of another bar clamp.