Operation
A steam shovel comprises:
- a bucket
- boom and 'dipper stick'
- boiler
- water tank and coal bunker
- steam engines and winches
- operator's controls
- a rotating platform on a truck, on which everything is mounted
- wheels (or sometimes caterpillar tracks or railroad wheels)
- a house (on the platform) to contain and protect 'the works'
The shovel has several individual operations: it can raise or luff the boom, rotate the house, or extend the dipper stick with the boom or crowd engine, and raise or lower the dipper stick.
When digging at a rock face, the operator simultaneously raises and extends the dipper stick to fill the bucket with material. When the bucket is full, the shovel is rotated to load a railway car or motor truck. The locking pin on the bucket flap is released and the load drops away. The operator lowers the dipper stick, the bucket mouth self-closes, the pin relocks automatically and the process repeats.
Steam shovels usually had a three-man crew: engineer, fireman and ground man. There was much jockeying to do to move shovels: rails and timber blocks to move; cables and block purchases to attach; chains and slings to rig; and so on. On soft ground, shovels used timber mats to help steady and level the ground. The early models were not self-propelled, rather they would use the boom to manoeuvre themselves.
Read more about this topic: Steam Shovel
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