Leica CM1950 manual Knife guard, Securing/Locking the Handwheel

2. Safety and Design

Knife guard

Prior to manipulating the knife and specimen, changing the speci- men or knife, or taking a break, always lock the handwheel and cover the cutting edge with the knife guard.

The CE, CN and CN-Z knife holders feature knife guards; the glass anti-roll plate of the CE knife holder also serves as a knife guard.

2.4Securing/Locking the Handwheel

12o’clock position

6o’clock position

Fig. 7

1

2

Always lock the handwheel and cover the cutting edge with the knife guard prior to manipulating the knife or specimen, changing the specimen, or taking a break.

To lock the handwheel, press the lever (1) outward. Continue turning the handwheel slowly until the grip is in the upper or lower position and the handwheel is locked. Press the lever fully outward; gently rock the hand- wheel until the locking mechanism clicks into place noticeably.

To release the handwheel, press the lever (2) on the handwheel toward the cryostat housing.

Fig. 8

Fig. 9

Centering of the handwheel (motorized instruments only)

Pull out the handwheel’s handle and position it in the middle of the handwheel. The handle automatically engages in this position.

An important safety device on the cryostat is the centering of the handwheel for motorized instruments.

Rotate the handwheel only if the refrigeration system is on and the cryochamber is cold.

Leica CM1950 – Cryostat 11