looking for tool name - joist lever clamp

[Frank S]

This might be a little over the top for you it is an adjustable beam clamp that I just designed
it can be adjusted to fit most wood beams, joists or even sheet lumber starting as thin as 1/2" through 6" thick
Its strength is as strong as anything it would be clamped on if properly adjusted.
If clamped on a 4 by 8 beam for instance a load of over 2 tons could be possible

By the way it can not be pulled off accidentally by pulling at angles up to about 45° in any direction
it can only be removed by pushing up on the pull loop to allow the clamp to open