1861-03-29 Journal of the Society of Arts - Ferrabee Adjustable Wrench Listing

56. Patent Spanner and Screw Wrench; James Ferrabee and Co., Phoenix Iron Works, Stroud, Gloucestershire, and 75 and 76A, High Holborn, W.C.

The new feature in this spanner is the use of a wedge placed between the back of the stem and the moveable jaw. On this wedge the worm is fitted, which works into the teeth on the stem, and moves the jaw up or down as may be desired. The wedge slides with the jaw, and is made sufficiently taper to prevent the jaw from sticking when the strain is applied. By this arrangement the strain on the worm and the teeth of the stem is removed, and the spanner acquires all the strength of a solid one.