-17-
Fig. 11
5. Tool Retainer Section
Fig. 11 shows the structure of the tool retainer.
The tip of the tool retainer is covered with a front cap (made of rubber) to prevent dust and chips from
getting inside. The steel ball falls into the round groove of the bit to prevent the tool from coming off; the two
key rails transmit the rotation torque. To mount the bit, push the bit in the tool retainer as far as it will go.
Push lightly and turn the bit until it is caught. At this position, push the bit in as far as it will go (and note that
mounting the bit requires no sliding of the grip). To remove the bit, fully slide the grip backward and remove
the bit.
6. Dust Collector (B)
When drilling holes overhead, dust collector (B) (an optional accessory) can be mounted on the Model
DH 22PH to prevent dust and chips from falling downward. Dust collector (B) is intended solely for use
when drilling holes into concrete, and cannot be used for drilling holes into steel or wood. It is designed for
use with drill bits with overall lengths of 166 mm, 160 mm and 110 mm, and cannot be used with longer bits.
The use of a drill bit with an overall length of 166 mm with dust collector (B) permits drilling down to a depth
of about 72 mm. When using dust collector (B), be sure to securely fasten it to the grip on the main body
with socket adapter (B). Although socket adapter (B) rotates together with the tool shank, there is a steel
ball between the outer race and socket that serves as a ball bearing. Should the dust cover be forced
against the concrete surface, it will not rotate even though the tool shank continues to rotate. Should the
tool be operated with the dust cover not being held against a concrete surface, friction may disconnect dust
collector (B) from the grip. Accordingly, instruct the customer to press dust collector (B) and the drill bit
firmly against the concrete surface before turning on the switch to start drilling. When dust collector (B) is
used, almost no dust and chips are scattered about. However, since the chips and dust remaining in the
collector may be scattered after drilling operation, the customer should be advised to always wear
protective glasses or goggles. When disassembling dust collector (B) for repair or maintenance, be very
careful to prevent oil or grease from adhering to the steel balls. Grease or oil on the steel balls may cause
concrete dust to enter the unit and cause defective rotation.
Holder spring
Grip
Ball holder
Steel ball
Front cap
Stopper ring
Key rail (2 pcs.)
Holder plate
Cylinder
