Skip`s trap door for extraction from mine shaft, has pneumatic jack for lifting and lowering truck that controls trap door opening mechanism placed at rear of skip, and flap for hopper skip junction controlled by headframe ramp
摘要
<p>The trap door has a pneumatic jack (v) for lifting and lowering a retractable truck that controls a trap door opening mechanism placed at the rear of a skip. The mechanism has a load bearing axle that is lifted and lowered by the truck. Junction connecting rods to control the trap door are placed between cranks and the trap door. A flap for hopper skip junction is controlled by a headframe ramp.</p>
