Trapezoidal Undercut Warding Ribs: Camming Out Lock Picking Tension Wrenches
Engineering Overview: Engineering analysis of trapezoidal undercut keyway warding ribs causing rotational lock pick tension tools to slip and cam out under picking torque.
Technical & Engineering Specifications
| Standard | EN 1303 Key Security Grade 6 |
|---|---|
| Angle of Taper | 15-Degree Inward Warding Chamfer |
| Keyway Geometry | Trapezoidal Undercut Paracentric Broach |
| Security Function | Forces tension wrenches to slip and cam-out |
Tension Tool Lockout Geometry
Single-pin picking requires stable rotational tension. Trapezoidal Undercut Warding Ribs engineer the keyway walls with angled tapers.
Cam-Out Physics
- $15^\circ$ Inward Taper: Keyway side ribs feature a $15^\circ$ inward angle.
- Tool Slippage: When a flat tension wrench applies torque, the angled rib causes the tool to cam out and slip, making it impossible to hold stable picking tension.
Frequently Asked Engineering & Selection Questions
Q1: How do trapezoidal keyway ribs prevent lock picking?
The angled side ribs cause flat lock pick tension wrenches to slip and pop out of the keyhole whenever rotational pressure is applied.