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Jiffy Latch-Lok Assemblies FAQs

Can Jiffy Latch-Lok Assemblies be used for die casting or transfer molding applications?

The Latch-Lok is not recommended for die cast or transfer molding applications due to the higher temperatures encountered in these processes. The custom internal spring that applies pressure to the rocker may begin to anneal.

How should timing of the Jiffy Latch-Lok Assemblies be handled?

Timing of the Latch-Lok Assemblies should be within +/-.005 of each other for release bars and latch bars. This will prevent one bar from latching or releasing ahead of another assembly and causing deflection of the plate or the creation of an overload condition on the latch bar. Shock loads can adversely affect the ultimate strength of the latch bar. Therefore, mold open speeds may need to be reduced.

What are the design guidelines and major considerations for use Jiffy Latch-Lok Assemblies?

A minimum of two Jiffy Latch-Lok Assemblies per mold are required. However, four units are preferred. Larger molds may require six, eight or more assemblies.
The Latch-Lok should not be used to overcome springs. Springs can cause the plate to deflect and bind as soon as one latch bar is released, even if only the slightest timing difference is present. Latch bars and release bars must be properly aligned with the body. The bars should enter the body freely. The latch bar should be fully released prior to the stripper bolts starting to pull the plate. Check the stripper bolt length. There should be no preload on the latch bars in the locked position. Latch-Loks should only be used in a horizontal press; they are not recommended for use in a vertical press; Otherwise, the weight of the entire plate must be lifted.

When only two units are used, the bodies should be mounted on the centerline of the mold for balanced operation. If using more than two assemblies, symmetric positioning of the Jiffy Latch Lok assemblies about the mold centerline is recommended. Balance is critical in so the mold design should be symmetrical. If not, be aware of any binding that may take place.

What size Jiffy Latch-Lok should be used?

The following is based on usage of four Jiffy Latch-Lok assemblies in the mold.

  • a) Mold Base Width of 7-7/8 and under use LL-050 assembly
  • b) Mold Base Width of 9-7/8 to 14-7/8 use LL-101 assembly
  • c) Mold Base Width of 15-7/8 and larger use LL-201 assembly.

Please note that the desired speed for the mold open sequence can affect the recommended size of Jiffy Latch-Lok assembly used. Also, the above mold base sizes consider standard offering for each size. If you are intending to use a special over-sized mold base, and/or if you are intending to use in a high-speed injection machine, it is recommended that either larger or more assemblies (more than four assemblies) be used.

What type of maintenance is recommended for Jiffy Latch-Lok Assemblies?

Lubricate the rockers periodically with a light lubricant such as lithium or oil containing P.T.F.E.