Graseby 3000/500, Manual

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5 — 1
G r a s e b y M e d i c a l L t d .
5
3 0 0 0 / 3 1 0 0 a n d 5 0 0 / 5 0 5 S e r v i c e M a n u a l I s s u e A ( A p r i l 2 0 0 2 )
V o l u m e t r i c I n f u s i o n P u m p s
Mechanical Systems
Linkage system
The pumps employ a linkage system to move the cam housing/
pumping mechanism between the load position and the operate
position (see Fig. 5.1). The load position is used to load and unload
the fluid filled cassette.
The operate position brings the pistons and valves of the pumping
mechanism in contact with the cassette, and is monitored by the
microprocessor as it reads a signal from the cam housing switch
positioned on the cam housing.
The pumping mechanism is spring loaded to keep it in the load
position whenever the door is opened. When the door is closed the
linkage mechanism is actuated by the handle/arm assembly and the
pumping mechanism is drawn forward into the operate position.
Once in the operate (door closed) position, the latch lever secures the
pumping mechanism in place.
Figure 5.1 Linkage system and safety clip switch
Linkage
Wedge
Safety Clip
Retention
Slot
Safety Clip
Switch
Cam Housing
Switch