Fig. 624.
Fig. 625.
Fig. [625] represents the Trimo pipe wrench. This name is an abbreviation of the word Tremont from the street in Boston of that name. It is adjusted to its work by a milled nut in the pivoted jaw; the latter is brought into position at each stroke by a leaf spring attached to the main lever. In the larger sizes the steel jaws are removable or can be detached and replaced after being repaired. The lower engraving, Fig. [626], is a chain tongs with removable, tool-steel jaws. The hard scale on the piping rapidly destroys the sharp edges on these jaws so that they require frequent sharpening. The links of the chain have a peculiar hook form so that they cannot slip.
Fig. 626.
A spanner, shown in Fig. [627], is a special form of wrench, which circles or spans around; generally used for twisting a circular-shaped portion, provided with holes in its circumference.
