Vibration-Absorbing Construction - Hitachi H 90SE Technical Data And Service Manual

8-3. Vibration-Absorbing Construction

(1) Vibration-absorbing construction
A hole passing through the housing ass'y houses a handle shaft which in turn supports a switch handle and
side handle which are mounted in a T shape, at right angles to the operating direction of the main body of
the tool. The handle shaft can be turned and is installed in a position slightly deviated from the handle
operating point. Both ends of the handle shaft are equipped with Neidhart Springs, each of which consists
of four rubber handle dampers inserted between a handle holder (B) and a handle holder (A). Each handle
holder (A) has four involute-type, wing-shaped appendages. When the operator pushes down on the
handles, each holder (A) rotates, bending the handle dampers and reducing vibration. Also, the angle of
rotation of the handles is controlled by stoppers. Through adoption of this type of vibration-absorbing handle
construction, the Model H 90SE causes much less operator fatigue and can be comfortably operated for
significantly longer periods than conventional products.
SW lever
Handle (A)
(B)
Handle (A)
Handle (B)
SW lever
Housing
Handle
holder (B)
Handle damper (4 pcs.)
Handle damper (4 pcs.)
Holder (A)
Handle holder (B)
Handle shaft
Holder (B)
Side handle
Handle
holder (A)
Holder (A)
Handle holder (A)
Hole
Involute Neidhart Spring
Fig. 7
Holder (B)
Handle shaft
Stopper
Housing
Handle holder (A)
Fig. 8
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Stopper
Holder (A)
Holder (B)
Handle shaft
Stopper
Hole
Holder (B)
Handle damper (4 pcs.)
Holder (A)
Side handle