sprags
Mining cart brakes
Sprags are wooden or metal props used to prevent movement—especially in mining, where they brace tunnel roofs or block wheels to keep coal carts from rolling.
The singular sprag serves the same function: He jammed a sprag under the wheel.
In British dialect, sprag can also mean a young or lively person, particularly a boy.
Wedges preventing rolling
- bracesDental alignment devices
- strutsWalks with swagger
- shoringTemporary structural support
- buttressesExternal wall supports
wedges · supports · timber · reinforcement · stabilization · underpinning · scaffolding · stanchions
Wedges preventing rolling
- timberingWooden structural reinforcement
- coalCombustible sedimentary rock
- seamJoined fabric edge
- driftGradual movement, no direction
shaft · gallery · face · longwall · miner · excavation · underground · bituminous
Wedges preventing rolling
- wheel stopsBarriers limiting vehicle movement
- skidUncontrolled lateral slide
- brakeDevice to slow motion
- immobilizationPreventing movement entirely
restraint · incline · gradient · rolling stock · tram · cart · wagon · downhill
chocks
Wedges preventing rolling
buttresses · wedges · supports · timber · reinforcement · stabilization · underpinning · scaffolding · stanchions · posts
chocks
Wedges preventing rolling
drift · shaft · gallery · face · longwall · miner · excavation · underground · bituminous · anthracite
chocks
Wedges preventing rolling
- wheel stopsBarriers limiting vehicle movement
- skidUncontrolled lateral slide
- brakeDevice to slow motion
immobilization · restraint · incline · gradient · rolling stock · tram · cart · wagon · downhill · slope