Features
- Polycarbonate Construction (hard wearing, non-rusting, lightweight)
- Unique spring-operated, cam lockout mechanism
- Latching and non-latching versions
- Grease-packed pull rope sliders
- Water and dust resistant to IP65 

SOLUS pull keys provide stopping and signalling facilities on stage loaders, haulages and roadway conveyors with a variety of GAI-Tronics and other approved manufacturers' control circuits. Their remarkably low weight combines with their unique resistance to corrosion and impact damage to provide unsurpassed reliability in operation and convenience in installation and maintenance.

At the user's option, SOLUS pull keys can be supplied with:

- latching or non-latching lockout mechanism 
- sealed or unsealed micro-switches with gold-plated contacts 
- an independent signal button

The case and cover are precision-molded from flame-retardant polycarbonate and the interior is of two-part construction to provide isolation between the mechanical, the electrical and the terminations sections. The pull mechanism is mild steel, zinc-plated and passivated, and grease-packed for additional protection. 

The pull ropes and all external screws are stainless.

The cover is secured by four M6 hexagon-head captive screws.

"Cat's Eye" type reflectors in the end of the Lockout/Reset switch are visible along the roadway when the switch is in the 'Lockout' position.

A slotted mounting hole 21 x 11 mm is provided at each end of the unit.

                        [ A Typical Conveyor Control Signaling and Communication System Showing Solus Pullkeys ]

Operation
Running:
Front cover switch in ‘Reset’ position. The circuit is intact with the machine running or ready to run. Signaling
can be performed with the signal button (if fitted). 

Pull Cable Lockout:
Pull and release the pull cable. On a latching pull key the front cover switch remains in the ‘Reset’ position and the lockout is latched electrically at the control unit. In both cases, once lockout has been achieved, further pulls on the cable or operations of the signal button if fitted will cause signal raps to be sent from the pull key to the control unit.

Manual Lockout:
Turn the front cover switch to ‘Lockout’ position. The circuit opens and the machine
stops. Signaling may now be performed by turning the front cover switch further clockwise, or by pressing the signal button (if fitted) or by pulls on the Pull cable.

Reset-Latching Pull Key:
Turn the front cover switch to the ‘Reset’ position. The circuit is now intact and the machine can be started from the control unit.