A rafter angle square door clamp stand system functions like a truss, utilizing tension and compression. A horizontal tension base is suspended off of the ground by rotatable support members, one at each end of the base. The tension base has a T shaped slot that runs the length of the base. Two rafter angle squares, each having a T shaped member, slide into the slot of the base, one from each end of the base, with the vertical edges of the angle squares facing each other. The weight of the door on the tension base causes the base to flex downward, and the rafter squares to compress, holding the door in an upright position. Stop elements prevent the angle squares from moving backwards when the door is compressed and clamped. The system can be converted to support cylindrical objects, by reversing the positions of the angle squares.

Provided is a clamp that includes a rail with a track region, a first clamping jaw that is to be maintained at a first clamping location along the rail while a plurality of edge-aligned objects are clamped together. A second clamping jaw is adjustable along the track region of the rail and is to be maintained at a second clamping location along the rail on an opposite side of the plurality of edge-aligned objects from the first clamping jaw. A clamping mechanism urges a face of the second clamping jaw toward the first clamping jaw to impart a compressive force on the plurality of edge-aligned objects. A caul extends between the first and second clamping jaws and exerts a compressive force on the plurality of edge-aligned objects disposed between the caul and the rail.

A rapid assembly system includes a mounting and a plate removably mounted onto the mounting. The system has connection devices between the plate and the mounting. Each device also includes a clamping means for holding the plate against the mounting; a tooth having a pair of tooth engagement surfaces arranged in a V-shape, the theoretical intersection of which extends in a tooth direction; and a groove with a pair of groove engagement surfaces for engaging the tooth engagement surfaces.

A clamper actuation mechanism contains: a fixed clamper, a drive handle, and a movable clamper. The fixed clamper includes a fixed defining sheet, two first pieces, two elongated slots, two first locating orifices, and two second locating orifices. The drive handle includes a press extension, a third locating orifice, a fourth locating orifice, and a first stem. The movable clamper includes a movable defining sheet and two second pieces. Two fifth locating orifices are formed on the two first pieces, two limiting grooves are defined on the movable clamper, and a second stem is inserted through the two fifth locating orifices and the two elongated slots to rotatably connect the movable clamper and the fixed clamper. A control bar is inserted through the two limiting grooves, the two second locating orifices and the fourth locating orifice to rotatably connect the movable clamper, the drive handle, and the fixed clamper.

A work piece holder including, but not limited to, a bracket having a first arm, a second arm, and a gap between the first arm and the second arm. A first portion of the second arm is non-parallel with a first portion of the first arm such that a lower portion of the gap is narrower than an upper portion. The work piece holder further includes a wedge having a first side and a second side. The second side is configured to engage the first portion of the second arm. The wedge is configured to move along the first portion of the second arm. The wedge and the first arm support the work piece when the work piece is positioned in the gap and the wedge has moved along the first portion of the second arm to a position where it engages the work piece.

A device for holding a door in a stable position while the hinges which affix the door to the door frame are either replaced or initially installed. The basic features of the device consist of a base to which two side panels are affixed opposite each other. One of the sides is equipped with one or more clamping mechanism with the other side equipped with cushioning pads aligned opposite of the clamping mechanism. Stabilizing rotatable outriggers are attached to each side panel to assist in the restriction of movement of the device relative to the floor. The device may be used in either a vertical or horizontal position depending upon the clearance between the door and the floor.

A retrievable shaft locking mechanism for axial and rotational locking on smooth round shafts with a lever providing tensioning of the clamping ring and vectorially supporting a clamping action through a horizontal dowel pin.

A rafter angle square door clamp stand system functions like a truss, utilizing tension and compression. A horizontal tension base is suspended off of the ground by rotatable support members, one at each end of the base. The tension base has a T shaped slot that runs the length of the base. Two rafter angle squares, each having a T shaped member, slide into the slot of the base, one from each end of the base, with the vertical edges of the angle squares facing each other. The weight of the door on the tension base causes the base to flex downward, and the rafter squares to compress, holding the door in an upright position. Stop elements prevent the angle squares from moving backwards when the door is compressed and clamped. The system can be converted to support cylindrical objects, by reversing the positions of the angle squares.

A multi-functional clamping device is disclosed. The multi-functional clamping device includes a handle portion having a vice grip handle, and a clamping portion coupled to the handle portion. The clamping portion includes opposing clamps. The multi-functional clamping device also includes an accessory mount coupled to the clamping portion. The position of the accessory mount is adjustable or non-adjustable with respect to the clamping portion. Further, the multi-functional clamping device includes an accessory locking fixture coupled to the accessory mount.

A hold-down clamping apparatus comprising a hold-down clamp with body having a top lip and pair of guide legs disposed between a central screw in the body and a support having holes in vertical alignment with the legs and the screw for securing and holding down a sheet material for processing. The screw is threaded through the support screw hole as the legs are inserted within support holes until the top lips contacts the sheet material to hold down the material and to prevent twisting of the hold-down clamp. Supports with clamps may be fastened to tools or supports. In one embodiment, the support has a grid of holes for securing a plurality of materials with hold-down clamps. In another embodiment, the hold-down clamp comprises a top lip and a guide beam slotted in a support and secured.