This is an American Heavy Door Clamp. The purpose of the clamp is to close joints and hold for wedging, pinning, or gluing. The left and right hand wheels together move the back rail back and forth to suit door (or sash) width.

The foot pedal, a stout forging, leverages links that make the final pinch. A small foot pedal pushes the links back over the over-center locking point and releases the clamp.

There are several sets of dogs for the rails. Heavy for doors, light for blinds (seen here with sash), and a set of self squaring sash clamps. There is also a heavy clamp that fits in brackets and presses between the rails parallel to the bars.

Machines like this make light work of door and sash assembly.

This is the clamp set up for four panel doors. Dogs are doubled for the bottom rail. The squeezer is in place in its brackets. I always work from the right. The clamp rails are a foot longer on the other so that always seemed the place for the easier load. And I’m right handed.

Sash in clamp. In this case the muntin squeezer is pinching the bars which are vertical on this awning sash. The machine is so powerful that I believe it to be no harm working small items to the side where all the controls are easily reached and where little of its leverage is required to compress the joints.

This is another way to use the clamp. These are the sash attachments. They self center, usually. Always good to check. Only worth setting up with a number of multiple lite sash of the same size. Trammel point the pivot centers or set to a pre-squared sash. Must be bars and muntins in the field for these to work.

This is an unusual set up for me – sashes rotated – as the sash are too wide to do by my preferred method shown second photo above.

Close up of the sash attachment. Pivots at the screw. Too much pressure will open the bottom the joint. The set screw to the clamp rail is a must. Once set, these four corners need to stay put. Use the foot pedal as normal to press.


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