Spring-beam.
1. (Shipbuilding.) The foreand-aft timber uniting the outer ends of the paddle-box beams. The sponsons are curved timbers uniting the spring-beam to the sides, fore and aft of the paddlebox. 2. An elastic bar at the top of a tilt-hammer, mortising-machine, or jig-saw, to accelerate the fall or give the return motion, as the case may be.
3. (Carpentry.) A beam stretching across a barn without a central support, so as to leave the two bents of the barn floor free for various uses.
Spring dirk-knife. |