Page 1
Calculus
Operating Instructions
1 3
2
4
Seat Height
Lift right hand lever. Use body weight
to raise or lower the seat (sit on the
seat to move down, take weight o
to move up). The seat will lock at the
height the lever is released.
Free oat Mechanism
Pull up rear lever to right and side
of seat. The chair back will remain in
permanent contact with the user as
they move throughout the day. To
secure the back at any desired angle
push lever down.
3
1
Please note all instructions are assuming the user is sat in the chair.
2
Back Height
Place hand below back and slowly
lift to desired height using 8-point
ratchet system. When the highest
point is reached the back will drop to
the starting position.
4
Height Adjustable Arm
Pull up button on the inside of the
arm to raise or lower. Release when at
desired position.
Page 2
Calculus
Operating Instructions
5
Optional Extras
8
5
7
Independent Seat Tilt
Lift forward lever on the left
hand side of the seat to tilt
forward. Release to lock in
position.
6
Synchronous Movement
Pull up rear lever to the right hand
side of the seat. The seat and
back will move together in a ratio
of 2.5:1. To secure in any desired
position push down lever. To
adjust the tension to the weight
of the user, adjust the rear knob
situated under the front of the
seat, turn clockwise to increase
resistance and anti-clockwise to
decrease.
Pump-up Lumbar Support
Repeatedly press rubber air
cell located to the left until the
lumbar has reached the required
rmness. To de ate, press the
button on the top of the air cell.
Pronounced Lumbar Roll
This is a xed lumbar cushion
which can only be tted into the
chair at the time of manufacture.
It is not adjustable.
6
6
8
Please note all instructions are assuming the user is sat in the chair.
7
Seat Slide
Lift lever located on the left
under the seat and use weight to
move seat forward. There should
be up to 3 ngers gap between
the front of the seat and behind
your knees when sat all the way
back in the chair.
Extra Height Gas Spindle
& Footring
This base may be tted to the
chair for counter or bench work.
The footring is independently
adjustable to suit the user. All
chairs tted with this option are
supplied with glides instead of
castors
.
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