Bump-offs are a clever technique we use when we want to create a part with some kind of undercut, but still want the simplicity of a straight-pull mould. Under normal circumstances these undercuts would catch on the mould when you were ejecting it.
Precision Molds » HB International
Design Tip: 6 ways to achieve undercut success in molded parts
Molds Technologies – Injection Molds – Strip Molds (Bump-Off Molds
Mastering the Undercut in Manufacturing - Natech Plastics
Climbing/Modular Offroad Racing Protective Diving Motorcycle
Undercut Injection Molding: Achieve Undercuts in Injection Molding
Plastic Injection Moulding Terminology Simplified - Part 2
Tricks of the Trade on RTOs and RSOs
Manufacturing Complex Automotive Barbed Hose Connectors