USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
FIGURE 9.
SPECIAL TIPPED SCREWDRIVER.
(4) Reed
& Prince Screwdrivers (Cross-Point).
Reed & Prince
screwdrivers are
similar to the Phillips type; however, do not confuse them,
for the tip is
different, as shown in figure 9.
These screwdrivers are
issued in 3 to 8
inch sizes.
(5) Clutch-Heed Screwdrivers.
Clutch-head screwdrivers (figure 9)
are used to drive clutch-bit screws.
These screws are commonly called
butterfly or figure 8 screws and have recessed heads.
The clutch-type
screwdriver is issued in 3, 4, 5, and 6 inch sizes.
(6) Offset Screwdrivers. Offset screwdrivers (figure 9) are designed
to drive or remove screws that cannot be lined up with the axis of common
screwdrivers, or are located in tight corners.
An offset screwdriver is
usually made from a piece of steel, round or octagonal in shape, machined so
that the end portion is at right angles to its longitudinal axis. They are
made in a variety of sizes having different width tips.
Some offset
screwdrivers are made with two blades, one of different size at each end. A
double-tip offset screwdriver has four blades.
(7) Ratchet Screwdrivers.
Ratchet screwdrivers (figure 10 on the
following page) are used to drive or remove small screws rapidly.
The
spiral ratchet screwdriver automatically drives or removes screws. It can
be adjusted to turn left, right, or to be
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