MECHANISM THAT ALLOWS THE USE OF INTERCHANGEABLE HEADS

This invention relates to a mechanism. Specifically, but not exclusively, this mechanism is designed in such a way as to receive a variety of interchangeable heads, of different sizes and designs, which form the final, modular structure of the products in which this mechanism is contained. The connection of the mechanism with the interchangeable heads is achieved by the use of a lug, forming part of the interchangeable heads, located at the bottom of the interchangeable heads and which connects the parts securing the interchangeable heads inside the mechanism in one of the two available unequal locking positions.

A corresponding mechanism is known (PCT/EP2019/068912). The known mechanism is applied only to jewelry products and offers the possibility to the user to shape the final image of the jewelry it wears, by applying interchangeable heads to the mechanism. The known mechanism is significantly lagging behind in safety issues as the internal geometry, the general structure and mode of operation of various parts of the mechanism may easily lead to damage or malfunctions of parts of the mechanism which ultimately make the product to which the mechanism has been applied non-functional and therefore non-usable.

In particular, the first of the two locking positions of the interchangeable head in the known mechanism is unstable and not completely secure with a high risk of loss and destruction of the interchangeable head or destruction of the mechanism itself and consequently of the whole jewelry. This is due to the fact that the interchangeable head, in the first locking position is partially encapsulated in a cavity with a very thin roof which is the cover of the mechanism as well. The continuously applied pressure in the first locking position to the lug, forming part of the interchangeable head, by the spring and the spring cover often leads to weakening of the cover resulting in the ejection of the head. This cover is incorporated with the rest of the mechanism after its installation in the recess of the mechanism and through laser welding process. This procedure makes the strength and durability of the cover questionable over time, taking into account any damage or forces exerted on it either by pressure of the spring and the spring cover or by traction received by the interchangeable head from external factors which may destroy it; for example a tangled interchangeable head in a wool clothing or in the hair of a user who then pulls it to release it may result in the destruction primarily of the mechanism and secondarily of the product itself. This malfunction is reinforced by the fact that in the known mechanism, the gap created in the first locking position between the mechanism and the interchangeable head is sufficiently large and allows easier penetration of objects or materials which can exert pressure by pushing the interchangeable head outwards, thereby facilitating the destruction of the mechanism. In addition, the protrusions on both sides of the spring cover and the base of the mechanism create a significant operational problem in the known mechanism. These protrusions were created to ensure that the spring is applied consistently at both ends of the protrusions in order not to lose its stability and balance within the mechanism which leads to a malfunction of the spring, as in this way two of the four coils of the spring are substantially weakened while at the same time the chances of one of these coils being deformed during their oscillation in the use and operation of the product are multiplied. Therefore, in the event that the spring is deformed and partially damaged, due to the above malfunction which is reinforced through the repeated use, and since the cover remains permanently welded to the top of the mechanism, a spring replacement is not possible leading to total damage of both the mechanism and the product bearing the mechanism.

Furthermore, the base's geometry of the known mechanism creates substantial problems during the casting process with the method of the lost wax. Most jewelry is made with this method and this mechanism cannot be made in any other way, regardless of the industry in which it is applied. The base in the model for casting of the known mechanism leads to a significant percentage, during the venting stage, to the phenomenon of accumulated bubbles within the mechanism, making this cast model non-functional. The same phenomenon was observed after thousands of casting tests of mechanisms, using either centrifugal or vacuum pressure casting. The purpose of this invention is to solve all the existing problems of the known mechanism and at the same time to increase to a significant level the ability to produce the mechanism more quickly, qualitatively, successfully and massively. This is achieved through the creation of a new mechanism, the innovations of which lead to a significantly higher degree of durability of the components of the mechanism and a strong increase in the sense of safety developed by the user, for the product. The solution of this problem is achieved according to the invention by means of the features mentioned in claim 1. Multiple tests to solve the above-mentioned problems of the known mechanism showed that, if the cover's functionality is removed and its use as a roof in the first locking position of the lug is ceased and at the same time this functionality is transferred inside the mechanism, then the cover acquires an almost decorative character and solves the most important problem related to the safe operation and preservation of the interchangeable heads and hence, of the product in general.

In particular, the new mechanism eliminates the problematic use of the cover as a roof of the first locking position. The roof of the mechanism (1) has now been transferred to the inner walls of this cylinder which are much more compact and durable than the laser-welded cover. The cover no longer receives any substantial pressure and is mainly decorative. In addition, the gap between the head and the mechanism when the head is locked in the first position is significantly reduced, compared to the known mechanism. This is due to the fact that the first locking position is now much lower, since it has been transferred inside the main body (7) of the mechanism, compared to the position it had in the known mechanism, namely on the inner surface of the cover and thus constitutes a safe choice for the user to lock the interchangeable head. In addition _; in the known mechanism, when the head is in the first locking position, it serves only in terms of safety and avoidance of loss of the interchangeable head, while in the new mechanism it can be a choice of orientation of the interchangeable head by the user since aesthetically the result is much better due to the smaller distance between the interchangeable head and the mechanism.

The need to support the spring led to the creation of the adjacent walls to the base, in the shape of a semi-circle which restrain and direct the spring to the centre of the mechanism allowing its maximum possible deployment within the mechanism and making the experience of the heads' interchange really user-friendly. At the same time, the walls significantly prevent the push of the spring and the spring cover towards the inner walls of the mechanism and, consequently, below the two locking positions, allowing its maximum expansion. In case that the spring is trapped under the walls of the mechanism, as can happen in the known mechanism, there is a possibility that the mechanism itself is not fully functional as the user tries to insert the head while the spring cannot oscillate sufficiently to exert the desired pressure due to the position in which it is located and which forces it to complete its oscillation lower, thereby not holding the interchangeable head in the locking position.

The transformation of the shapes of one side of the spring cover which is placed on one side of the spring, and of the geometry at the center of the base of the mechanism, has greatly helped the mechanism as it does not deform, weaken or destroy the spring in any way. In the new mechanism, both in the spring cover and in the base of the mechanism, a cylindrical protrusion is used that is tangent inside the spring and allows the comfortable and absolutely vertical movement of the spring, while in the known mechanism the spring is wedged in both the spring cover and the base of the mechanism, often resulting in deformations, weakening or even deviation of the direction of the spring inside the mechanism.

The base of the new mechanism is produced separately and not along with the rest of the mechanism as in the case of the known mechanism. The construction of the known mechanism is done only through 3D printing and carries high risks for loss of mechanisms either during the process of 3D printing or during the casting process while the manufacturing cost is much higher as well. In this invention the prototype of the "hollow" mechanism is 3D printed only once, a silicone mold is made out of the casted prototype and multiple, cheap and qualitative wax copies are produced through the silicone mold which are very successfully casted in contrary to the high failure rate of castings observed in the models of the known mechanism due to the phenomenon of accumulated bubbles, created at the venting stage, caused by the presence of the base of the mechanism in the model during the process of casting, centrifugal or vacuum pressure casting. The base of the new mechanism is produced by a special mold, which produces thousands of copies in a very short time and which are welded to the bottom recess of the mechanism with flamethrower, making the model completely durable and safe. In addition, the existence of two holes in parenthesis forming at the bottom of the mechanism after welding allow liquid element to enter and exit to clean and release small particles, such as sand and soil.

Figure 1 shows a perspective view of the mechanism (1) which allows the use of interchangeable heads (2), the spring cover (5) and the mechanism's aperture (21) for receiving in use a lug (3) forming part of interchangeable heads (2).

Figures 2A and 2B show an interchangeable head (2) and the lug (3) forming part of the interchangeable head.

Figure 3 shows an expanded view of the components of the mechanism (1), which are the interchangeable head (2) and the lug (3) forming part of the interchangeable head (2), the cover (4) of the mechanism bearing an aperture (13) in the shape of the lug (3) and 2 protrusions (22) of the cover (4) in its perimeter, the spring cover (5) which has a cylindrical shape and at the bottom bears a spring cover's protrusion

(14) of a smaller diameter, a resilient member which is preferably a spring (6) and yet more a coil spring and alternatively, the spring may be any other resilient member such as a wave spring, torsion spring, or conical spring which is flat on the upper and lower surface, is placed in the mechanism's (1) base protrusion (9) and receives the spring cover (5), the main body (7) of the mechanism (1), the geometry of which bears a cover recess (12) for its complete incorporation, two locking positions (10,11) of the lug (3), and the base (8) of the mechanism (1) which is located at the bottom of the mechanism (1) and bears a base protrusion (9) which receives the spring (6). Figure 4 shows the cover (4) of the mechanism (1) bearing an aperture (13) in the shape of the lug (3) forming part of the interchangeable head (2) and two protrusions (22) in its perimeter.

Figure 5 shows an expanded view of the internal configuration of the main body (7) of the mechanism (1) with the two unequal locking positions (10,11) bearing side walls (15,16) while the second locking position (11) also defines the end-position (17) of the path of the permitted movement of the lug (3) within the main body (7) of the mechanism (1), the inner cavity (18) of the main body (7) of the mechanism (1), the cover recess (12) which is formed in the upper part of the main body (7) of the mechanism (1), the special configuration of the adjacent walls (23) to the base (8) and the bottom recess (24) for incorporating the base (8) of the mechanism (1).

Figures 6A and 6B show a top and a perspective view of the bottom of the main body (7) of the mechanism (1), the two unequal locking positions (10,11) with side walls (15,16) while the second locking position (11) also defines the end-position (17) of the path of the permitted movement of the lug (3) within the main body (7) of the mechanism (1), the inner cavity (18) of the main body (7) of the mechanism (1), the special configuration of the adjacent walls (23) to the base (8) and the bottom recess (24) for incorporating the base (8) of the mechanism (1). Figure 6C shows a top view of the bottom of the mechanism (1), the first locking position (10) with its side walls (15,16) and the two cleaning access holes (25) in the shape of brackets formed at the bottom of the mechanism ( 1) after the incorporation of the base (8) of the mechanism (1) into the main body (7) of the mechanism (1). Figure 7 shows a top view of the upper part of the main body (7) of the mechanism

(1), two locking positions (10,11) of the lug (3) with side walls (15,16) while the second locking position (11) also defines the end-position (17) of the path of the permitted movement of the lug (3) within the main body (7) of the mechanism (1), the special configuration of the adjacent walls (23) to the base (8) of the mechanism (1) and the cover recess (12) of the main body (7) of the mechanism (1) which receives the cover (4) of the mechanism (1).

Figures 8A, 8B and 8C show a top and two perspective views of the geometry of the spring cover (5) and the spring cover's protrusion (14) which the spring cover (5) bears at its bottom and allows it to be placed on the top of the spring (6). Figures 9A and 9B show a top and a perspective view of the base (8) of the mechanism

(1) which is located at the bottom of the mechanism (1) and bears a base protrusion (9) which receives the spring (6).

Figures 10A, 10B, IOC and 10D indicate the orientation (19,20) of the interchangeable heads (2) when they are fastened to either the first locking position (10) or the second locking position (11) of the mechanism (1). The orientation (19) of figures 10A and 10B corresponds to the second locking position (11) while the orientation (20) of figures IOC and 10D corresponds to the first locking position (10).

Figure 11A shows a specialized tool (28) mounted in the position of the interchangeable head (2) which is designed and constructed in such a way that the cover (4) can be laser welded to the main body (7) of the mechanism (1), very easily and fast. The extended length of its lug (3) combined with its small width allows the craftsman to have good visibility and not to obstruct his work the shape of the interchangeable heads (2) which are always located very close to the main body ( 7) of the mechanism (1). Figure 11B shows the specialized tool (28) mounted in one of the two locking positions

(10,11). In this way, the cover (4) is released from the pressure that would otherwise be exerted on it by both the spring (6) and the spring cover (5) and that would make the work of the craftsman much more difficult during the laser welding process.

Figures 12A, 12B, 12C and 12D show in perspective and top view of the silicone mold (26,27) used to imprint the shape of the metallic prototype of the main body (7) of the mechanism (1) on the silicone and then used for the purpose of large-scale production of wax copies of the main body (7) of the mechanism (1).

The mechanism that allows the use of interchangeable heads is specifically, but not exclusively, used in the field of jewelry, offering users the opportunity to become the creators of their own, personalized jewelry. The users, having bought some interchangeable heads as decorative elements but also jewelry with new mechanisms embedded, which are boxed in rings, pendants, earrings, bracelets, cufflinks, pins, etc., have the ability to change their image whenever they wish. In addition, no tool is required for the interchange of the interchangeable heads while the totally safe and user-friendly operation of the mechanism leads to a strong and interactive relationship between the user and the product bearing the mechanism. Furthermore, the interchangeable heads can bear a decorative element on top of them and inside the interchangeable head (2) could be embedded a fully functional microcircuit of various technologies, e.g. NFC, RFID (Near Field Communication, Radio Frequency Identification) which is not visible to the user and alternates among mechanisms (1) that are parts of smart devices and smart accessories. Additionally, the use of the mechanism (1) in multiple products allows the interchange of interchangeable heads (2) and enables a user to give the interchangeable head (2) to another user with the microcircuit it may need. E.g., an interchangeable head with an embedded nfc microcircuit, which operates as a door key and as a decorative element of a piece of jewelry as well, is given by a userto another user who applies it on its own mechanism (1) which is embedded into its own product bearing a mechanism (1) and uses it to open a specific door. The mechanism (1) carried by each user through the product in which it is embedded, is in essence the means of transport of the interchangeable head (2) which is transferred from user to user, at will.