Patent ID: 7172183
Filing Date: 2007-02-06
Classification: B25B

Abstract:
1. A hand clamp comprising: a housing including a downwardly extending handle for being held by a hand of a user, and including a channel formed in said housing, a piston rod slidably received in said channel of said housing and movable forwardly and rearwardly relative to said housing, a driving lever engaged in said housing and including an opening for slidably receiving said piston rod when said driving lever is perpendicular to said piston rod, and for selectively engaging and gripping said piston rod when said driving lever is tilted relative to said piston rod, a first biasing means for biasing said driving lever relative to said housing and for forcing said driving lever to be perpendicular to said piston rod, a trigger pivotally attached to said housing, a driving shaft attached to said trigger and moved in concert with said trigger, for being moved to engage with said driving lever and to tilt said driving lever relative to said piston rod against said first biasing means, and for allowing said piston rod to be moved relative to said housing by said trigger and said driving shaft step by step when said trigger is cyclically pulled and released by the user, a braking lever engaged in said housing and including an opening for slidably receiving said piston rod when said braking lever is perpendicular to said piston rod, and for selectively engaging and gripping said piston rod when said braking lever is tilted relative to said piston rod, a second biasing means for biasing said braking lever relative to said housing and for forcing and tilting said braking lever to grip and brake said piston rod to said housing and to prevent said piston rod from sliding relative to said braking lever and said housing, and a hand grip pivotally coupled to said handle, and including an actuating end for selectively forcing and erecting said braking lever against said second biasing means to a position perpendicular to said piston rod, and for selectively releasing said piston rod from said braking lever, and said trigger and said hand grip being operatable with the hand of the user that hold said handle of said housing.