A clamping device for adjoining board materials, comprising:
- a C-shaped base having a horizontal base section, a top arm and an upright arm connected between the base section and the top arm;
- the top arm of the base being formed with two through holes passing through the top arm from a top face of the top arm to a bottom face thereof;
- a first press rod and a second press rod, which are identical to each other in structure, the first and second press rods being respectively up and down movably installed in the two through holes of the base, the second press rod being closer to the upright arm of the base, each of the press rods having:
- an outer tube having a solid section disposed in the outer tube, the solid section being formed with a threaded hole in an axial direction of the outer tube;
- at least one passage passing through the solid section in the axial direction of the outer tube;
- a cam mechanism disposed in the outer tube, the cam mechanism including a threaded rod and a cam lever, a front end of the cam lever having a cam section pivotally connected with a top end of the threaded rod, a bottom end of the threaded rod extending from a top end of the outer tube into the outer tube and being screwed in the threaded hole of the solid section;
- the cam lever being positioned outside the top end of the outer tube and shiftable between a releasing position and a pressing position;
- and
- a link assembly mounted in the outer tube and movable along the outer tube, a top end of the link assembly extending through and out of the passage of the solid section, whereby when shifting the cam lever to the pressing position, the cam section pushes the link assembly to move toward a bottom end of the outer tube;
- a clamp head being connected with a bottom end of the link assembly and positioned outside the bottom end of the outer tube;
- two first fastener assemblies respectively installed between the top arm of the base and the press rods, the two first fastener assemblies serving to clamp or release the outer tubes of the press rods;
- a horizontal holder mechanism including:
- a slide seat formed with a second through hole passing through the slide seat from a top face of the slide seat to a bottom face thereof;
- the slide seat being further formed with at least one guide hole passing through the slide seat from a front end face of the slide seat to a rear end face thereof;
- at least one guide pin slidably fitted in the guide hole of the slide seat;
- and an abutment member disposed at a front end of the guide pin;
- the first press rod being fitted through the second through hole of the slide seat, whereby the holder mechanism is up and down movable within the base along the first press rod;
- the abutment member being directed to the upright arm of the base;
- a second fastener assembly disposed between the slide seat and the first press rod for clamping or releasing the first press rod, whereby the holder mechanism can be secured to the first press rod;
- and
- a third fastener assembly disposed between the slide seat and the guide pin for clamping or releasing the guide pin.