ratchet assembly, which you can adjust to drive or remove screws.
You can also lock it in position and use it as an ordinary
screwdriver.
Figure 2-35.
Automatic screwdriver
b. Phillips Screwdrivers. Phillips screwdrivers are used only
for driving Phillips screws (Figure 236). Phillips screws have a
head with two Vslots, which cross at the center. The tip of the
Phillips screwdriver blade is shaped like a pointed or beveled cross
to fit into these slots. This type of screwdriver cannot slip out of
the slot, therefore preventing damage to expensive finishes.
Figure 2-36.
Phillips screwdriver
2-7. Holding Tools.
a. Supporting Tools. Supporting tools consist of sawhorses or
trestles used to support workers and materials. Figure 237 shows a
pair of sawhorses, which you might use to support a piece of lumber
that you are cutting.
b. Retaining Tools. Retaining tools consist of various types of
clamps, which fall into the following general categories: C clamp,
doublescrew clamp, and bar clamp (Figure 238).
EN5155
2-18
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