Round Latch Pull – Compact Control for Precise Mold Movements

The round latch pull (Rundklinkenzug) from KNARR is a specially designed mechanical latch lock used in injection mold tooling to control the movement of mold plates during opening and part ejection. Its compact, internally mountable design makes it ideal for applications where space is limited, allowing reliable motion control without increasing tool size or complexity. It ensures that specific plates in a mold only move when a defined sequence is reached, improving process reliability. 

Key Design Features and Benefits

The round latch pull features a space-saving configuration that can be used centrally or decentrally within the mold base, providing flexibility across many tooling setups. Its easily adjustable stroke and optional DLC-coated components enhance wear resistance and performance over long production cycles. The latch’s robust construction and integrated design support precise, repeatable motion, which is crucial for maintaining quality in high-speed molding processes. 

Typical Applications in Mold Construction

Round latch pulls are widely used in tooling that requires controlled multi-stage ejection or when a secondary sequence must occur before full mold opening. For example, they are used to hold one ejector set in position while another moves forward for part demolding, enabling complex part geometries and multi-stage motion without external drives. 

Installation and Customization Options

The design allows the rod length to be trimmed to the desired size, and threading can be added to fit specific mold requirements. This adaptability makes the round latch pull suitable for a range of applications, from simple single-stage actions to more complex multi-stage movements in larger tooling systems. 

Benefits for Manufacturing Efficiency

Using a round latch pull improves production reliability by providing consistent motion control without complex hydraulic or servo systems. Its compact form factor helps keep tooling costs down and simplifies maintenance, while the robust latch mechanism reduces cycle-to-cycle variability—key for high efficiency in injection molding operations. 

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