DE102022003881A1 - 3D printed insole for shoes with chambers/recesses and loose parts. - Google Patents

Abstract

The invention relates to a 3D printed insole with separate empty chambers/recesses, like a missing piece of a puzzle, as well as the individual fitting parts printed in 3D. The chambers of the insole and the loose parts can be manufactured with a straight wall and then possibly connected with auxiliary or operating materials (Fig. 2), as well as in a click system for connection without auxiliary or operating materials.

Description

The invention relates to a 3D printed insole with separate empty chambers/recesses, like a missing piece of a puzzle, as well as the individual fitting parts printed in 3D. The chambers of the insole as well as the loose parts can be manufactured with a straight wall and subsequent possible connection with auxiliary materials ( 2 ), as well as in the click system for connecting without auxiliary materials ( 1 ).

3D printed complete insoles are well known from the state of the art and are made from different materials such as TPU, TPE or rubber in different combinations in order to adapt them to the needs of the wearer.

The object of the present invention is to improve such insoles known from the prior art.

This task is solved by a 3D printed insole for shoes with separate chambers/recesses, as well as the individual fitting parts printed in 3D.

The advantage of this task, among others, is the quick and uncomplicated replacement of individual parts without having to remake the entire insole.

The chambers/recesses as well as the loose parts can be produced in different manufacturing forms.

It is advantageous if the lines of the loose parts and chambers/recesses are slightly concave and tapered downwards. This can be arranged in such a way that when the foot is placed on the ground, the chamber/recess transfers the pressure peaks downwards. This relieves the pressure optimally. Another great advantage of the chambers/recesses is the alternating effect of different heights of loose parts such as longitudinal arch supports, pads, etc. This makes it easy to test and select the right element directly on the foot without having to make a new insole. ( 3 )

The material for the insole can be TPU or TPE of various hardnesses. Here you will find filaments that are flexible, elastic and bendable and can be suitable for different applications. It should be noted that the insole should have a different shore hardness than the 3D printed loose part.

The TPU can be used in 95A and/or other Shore hardnesses. Other materials such as TPE and flexible rubber filaments with a Shore hardness of approximately 25 Shore-A or more for the starting material are also conceivable. Plastic materials are also possible.

It is advantageous if the filament material is a so-called “medical filament”. Antibacterial filaments are perfect for the medical field, especially for feet with open wounds, e.g. diabetes ulcers.

It is advantageous if the filament material has a thickness of 1.75. It should be processed with a hot nozzle of 0.4-0.8, with 0.6 proving to be ideal.

A second aspect of the invention relates to the click system or plug-in system for connecting the insole for shoes and the loose, separately printed part without using adhesive. This can be manufactured in different designs. A very plantar, lateral curvature is recommended, as this increases the cushioning effect without annoying or obstructive pressure points. ( 4 )

This prevents the insole from slipping relative to the loose part and fixes them in a fixed position relative to each other. This allows the insole to work optimally with its counterpart, without any other necessary auxiliary materials. ( 5 )

It is advantageous if the click system has a curvature of at least 5 mm away from the wall line. This allows the parts to be firmly positioned relative to the mold.

It is advantageous if the click system has a radius of at least 6mm along the wall line. Using such a radius can ensure that the loose part remains durable and does not break off, even when subjected to heavy use when walking over long distances.

It is also advantageous if the click area of the loose part has a filling of at least 30% when slicing. This prevents the loose parts from tearing and breaking out, as well as premature wear. In particular, this can prevent distortion in the transverse direction.

It is also advantageous if the strength of the insole and the loose parts differ.

Furthermore, the filling of the 3D printed insole and loose parts is different to By using a less dense filling, the flexibility of the loose parts is increased and improved using the same material as the insole.

A third aspect of the invention relates to the shape of the chamber/recess in the heel area to provide relief in the case of plantar fasciitis. The chamber/recess in the plantar fasciitis area tapers towards the tip of the foot. This provides relief while still ensuring stability of the insole, particularly in the longitudinal arch area. ( 6 )

A uniform arrangement of the walls all the way around the plantar area would also be possible, but would not make sense. This would significantly reduce the shape stability of the insole in the longitudinal arch. This not only reduces the quality of the overall product, but also destroys the effectiveness of the combination of relief and the simultaneous necessary support of the longitudinal arch.

The shapes can also be similar, as well as plantar concave, horizontally straight and tapered.

The invention is explained in more detail below using exemplary embodiments with reference to the drawing:

Here we show

• 1 : Oblique view of an insole with chambers/recesses, straight, concave, slightly inward-running, straight wall, with a click system. The click system is attached as a plantar arch. The oblique line in the direction of the forefoot is clearly visible on the rear foot pad on the heel. This means that the insole does not lose any stability, which must be supported in this area by the high forces of weight.
• 2 : Oblique view of an insole with chambers/recesses, straight, concave, slightly inward-running, straight wall, without a click system. The oblique line towards the forefoot is clearly visible on the rear foot pad on the heel. This means that the insole does not lose any stability, which must be supported in this area by the high forces of weight.
• 3 : Oblique view of an insole with chambers/recesses for built-in parts in the plug-in click system. Individual elements in the plug-in system can be exchanged very easily. The picture shows an example of possible loose parts in a certain position, which can be anywhere on the insole.
• 4 : Oblique view of a loose part with a click system with a lower arch. The lower arch acts as a click system, as the same arch is built into the insole as a negative, and ensures that the loose part is fixed to the insole. The picture shows an example that can also look different in terms of its shape and thickness.
• 5 : Oblique view of an insole and the associated loose parts in the click system. Here the insole is shown with the connected, clicked-in loose parts.
• 6 : Loose part as heel pad, optimal at an angle.

From the arch to the tip of the foot, it tapers upwards. This means that the function of the longitudinal arch support is not restricted. The picture shows an example that can also look different in terms of shape and strength.

Claims (1)

A: 3D printed insoles for shoes with recesses/chambers and one or more 3D printed loose parts. Marked that the loose parts are made to fit the recesses/chambers. B: Insoles according to Claim 1 , characterized in that the loose parts and the insoles are manufactured without a click system. C: Insoles according to Claim 1 , characterized in that the loose parts and the insoles are manufactured with a click system. D: Insoles according to Claim 1 , characterized in that the loose parts and the insoles are manufactured with a plug-in system. E: Heel pad with an angled shape/design to give the longitudinal arch of the insoles optimal stability and yet allow a perfect recess/chamber and loose part.

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