Patent 1,156,739 · Backus's Locking Clamp · Page 4
inclosed space a short distance from the front wall to form a key space, dogs inclosed within the space and disposed to coact with the toothed segments and having portions extending across the key space and adapted to be engaged by a proper key to effect simultaneous release from the toothed segments, and a spring normally holding the dogs yieldingly in engagement with the toothed segments.
    11. A clamp comprising pivoted jaws, one of such jaws being provided with transversely spaced toothed segments, dogs disposed to coact with the toothed segments and having projecting parts to be engaged by a key to effect release of the dogs from the toothed segments, and a partition disposed between the pivotal ends of the dogs to form a key space and having portions cut away to receive the projecting parts of the dogs.
    12. A clamp comprising pivoted jaws, one of such jaws being provided with transversely spaced toothed segments, dogs disposed to coact with the toothed segments and having projecting parts to be engaged by a key to effect release of the cogs from the toothed segments, a partition disposed between the pivotal ends of the dogs to form a key space and having portions cut away to receive the projecting parts of the dogs, and also formed with a lateral projection intermediate the cut away portions, and a flat spring supported upon the later projection of the partition and having its ends engaging the said dogs.

JOHN CLAYTON BACKUS. [L.S.]