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ELASTIC COMPONENTS FOR MOULDS Jumpy Springs are elastic components in polyurethane for moulds, which can be mounted in parallel or in series. Their high quality and excellent mechanical-dynamic characteristics are due to the special structure of the polyurethane compound employed by Cervellati. You will be provided with the loading tables, in order to facilitate your selection of the most suitable elastic element for the application you might require. Jumpy Springs advantages:  - Functional safety
- Extended life
- Low maintenance
- Reduced operating costs
Technical features:
High tear resistance High oil resistance Excellent abrasion resistance Continuous dynamic functioning
at 80-90° C Low heat accumulation due to
internal friction High breaking loads Elongation 500-600% Low permanent deformation High elastic performance
For technical specifications of Jumpy Springs, such as hardness, weight, height, and abrasion resistance, please, click here 
To view the available diameters and heights, please, click here
MOUNTING INSTRUCTIONS The purpose of this section is to assist technicians in selecting the correct size of the elastic component.
To take full advantage of Jumpy elastic components we recommend the following:
Adjust the Jumpy component's deformation within the allowed values (25-30% of the original height);
The length of the elastic component must not exceed twice its diameter to avoid load loss due to deflection;
Select the frequency of deformation in relation to the percentage of deformation to avoid dangerous overheating;
Ensure proper lubrication of the pilot pin and all work surfaces to reduce friction between the polyurethane and the metal
JUMPY ELASTIC COMPONENTS CAN BE MOUNTED IN TWO WAYS: A) PARALLEL MOUNT
This type of mounting doubles or triples the force necessary for deformation (see Fig. 1)
Total load P = a + b
Total deformation C = C1 = C2 B) SERIES MOUNT
When it is necessary to double or triple the deformation of the unit without varying the force of deformation (see Fig. 2)
Total load P = a = b
Total deformation C = C1 + C2  With both mounting methods, there should be enough space for the lateral expansion of the elastic components during the deformation.
To calculate the space necessary, note that d1 = 1.33 d (see Fig.2)
The deformation characteristics of Jumpy elastic components are a function of the percentage of deformation to be obtained, of the ShºA hardness of the elastomer, and of the form factor.
The form factor is obtained by calculating the ratio between the surfaces under load and the surfaces free to deform (see Fig. 3).
To free the user from making unnecessary calculations, we have supplied the following load tables for standard Jumpy elastic components.
Refer to the tables to make a quick selection of the elastic component best suited to the application.
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Jumpy Springs for moulds 
