spiral ratchet screwdriver
Noun: A spiral ratchet screwdriver is a hand tool designed for driving screws. It incorporates two key mechanisms: a ratchet, which allows the blade to turn in only one direction, and a spiral (or spiral drive) inside the handle, which converts downward pressure on the handle into a rotating motion of the blade.
This tool is used for installing or removing screws. The user applies downward force on the handle, which causes the internal spiral mechanism to turn the bit. The ratchet mechanism allows the user to choose the driving direction (tighten or loosen) and prevents backward motion, making it efficient for repetitive tasks.
- Noun:
- The old carpenter reached for his trusted spiral ratchet screwdriver to secure the hinge.
- For assembling the flat-pack furniture quickly, a spiral ratchet screwdriver is more efficient than a standard one.
- Mechanical Principle: The tool operates on a "push-to-turn" principle. The internal spiral groove acts like a screw thread; pushing the handle down forces a pin along the groove, causing the shaft and bit to rotate.
- Directional Control: The ratchet typically has three settings: forward (for driving screws in), reverse (for removing screws), and locked (which functions like a standard fixed screwdriver).
- Ratchet Screwdriver: A more general term for any screwdriver with a ratcheting mechanism, which may or may not include a spiral/push-drive feature.
- Push-Drive Screwdriver: Another name highlighting the spiral mechanism that converts linear push into rotation.
- Yankee Screwdriver: A historical brand name that became a common term for this type of spiral ratchet screwdriver.
- Automatic screwdriver (though this can also refer to powered tools).
- Push screwdriver.
No specific idioms are associated with this tool name. It is a technical term for a specific device.
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a screwdriver with a ratchet (so the blade turns in only one direction) and a spiral in the handle (so the blade rotates) with downward pressure on the handle
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