2012 series Tooling
(HK969)
Alcoa Fastening Systems
7
P
P
RINCIPLE
RINCIPLE
OF
OF
O
O
PERATION
PERATION
PULL Piston
Spring
Damper
Valve
Exhaust
Muffler
Air
Piston
Hydraulic Oil
Air Pressure
Exhaust Air
Hydraulic
Piston Rod
Throttle Valve
(PULL position)
Hydraulic
Piston Rod
Throttle Valve
(RETURN position)
Fig. 2
When the tool is connected to the air supply, air
pressure holds the
Throttle Valve
in the UP
position, and air pressure is directed to the top of
the
Air Piston
keeping it down.
When the trigger is depressed, the
Throttle
Valve
moves to the DOWN position, and pres-
surized air is directed to the bottom of the
Air
Piston
, causing the it to move upward (Fig.2a).
The air above the piston is exhausted and direct-
ed through the center of the
Throttle Valve
and
out the bottom of the tool through the
Muffler
.
As the
Hydraulic Piston Rod
moves upward, a
column of fluid is forced into the tool head,
which moves the
PULL Piston
rearward. The
attached nose assembly moves with the
PULL
Piston
to start fastener installation.
When fastener installation is completed, and
upon trigger release, air pressure with the assis-
tance of a spring causes the
Throttle Valve
to
return to its UP position.
Pressurized air is re-directed to the top of the
Air Piston
(Fig.2b), causing the
Air Piston
and
Hydraulic Piston Rod
to move downward. The
air from below the piston is exhausted through
the
Muffler
at the bottom of the tool.
As the
Hydraulic Piston Rod
moves downward
and hydraulic pressure is released from the
PULL Piston
, a
Spring
behind the
PULL
Piston
returns it to its forward position. The
Damper Valve
impedes oil flow at pinbreak
helping prevent “Tool Kick”.
Fig. 2a
Fig. 2b