The present invention relates generally to the field of finger rings, and more particularly to finger rings that are constructed to facilitate accommodation of multiple finger sizes and/or address sizing issues caused by aging, weight gain or loss, injury, arthritic conditions, etc.
The ability to properly size a finger ring has been a longstanding unresolved problem. Human body types can vary widely. Although largely determined by genetics, the size and shape of a person's hands and fingers can change substantially over time as a result of aging, diet and other conditions such as injury, arthritis, etc. The distal and proximal interphalangeal joints connecting the phalanges of the fingers can vary significantly in size. For various reasons, the proximal interphalangeal joint (i.e., the “knuckle joint”) is oftentimes substantially enlarged relative to the finger phalanges it connects, thereby causing a significant disparity in finger diameter. For typical finger rings of fixed diameter, this can be problematic in that the ring is either too tight to slide over the knuckle, or too loose on the proximal phalanx where the ring seats, resulting in constant irritation from undesirable persistent rotation of the ring on the finger.
Many attempts have heretofore been made to resolve the above problem. The use of an adhesive tape wrapped around the base (palm side) of the ring is often used to provide a better fit of a ring and prevent rotation on the finger. However, the tape is unsightly, usually absorbs water and perspiration, and eventually wears out and becomes compressed through repeated passage over the knuckle. Thus, frequent and time consuming replacement of the tape is required. Various mechanical devices have also been employed in an attempt to account for variations in finger size and prevent unwanted rotation of the ring on the finger. For example, ring inserts utilizing mechanical leaf springs and resilient deformable materials have been known to be installed on the inner ring surface to help account for and adjust to the variations in finger size.
Such mechanical devices, however, are oftentimes uncomfortable and susceptible to breakage through repeated placement and removal of the ring upon the finger. Such devices are typically mounted to the base of the ring, exerting pressure only to a localized region of the finger, which causes discomfort. Repeated transition of the ring over the knuckle also imparts a repeated transverse or axial “shearing” force to such devices that tends to dislodge them from the inner surface of the ring over time. This, along with everyday wear and tear on the ring, eventually causes the device to shear or pull away from the inner ring surface to which it has been mounted. Other sizing devices have been implemented which extend completely around the inner perimeter of a ring for better comfort, but have also proven to be susceptible to damage from transitional shearing forces and/or are complicated in design.
These aforementioned problems with finger rings have frustrated the jewelry industry for many years. With myriad finger sizes and shapes, manufacturers and retailers alike have found it necessary to carry large inventories of different and varying ring sizes to accommodate the needs of the industry. These large inventories are costly to maintain. Consequently, it is evident that there is a distinct need for a finger ring that is capable of accommodating reasonable variances in ring size, is comfortable and easy to put on and take off, is durable for extended use without degradation, and is aesthetically pleasing to the eye.
In the present invention, a finger ring is provided which includes a size-accommodating inner liner formed substantially throughout of a pliable, flexible and resilient material. The inner liner is adhered to and extends at least partly around the inner diametrical surface of the outer substrate or band of a finger ring. Although it is preferred that the liner extend completely around the inner diametrical surface of the finger ring, with the improved comfort and structural integrity provided by the liner design, it is contemplated that the liner could extend only partly around and still provide the benefits described herein.
In one exemplary embodiment, the outer substrate of the ring may be formed of a substantially rigid material, comprising without limitation, a suitable metal or plastic material, or a combination of both. The inner liner may be formed throughout of a relatively flexible, pliable elastomeric material, such as silicone rubber, although it is also conceivable that the liner could be formed of other flexible plastics or thermoplastic elastomers, or a combination thereof, without departing from the invention herein. The liner is preferably constructed of a self-adhering material having a high resistance to the aggressive additives typically found in hand lotions, such as Stearic Acid and Glycol. The liner may then be overmolded to the inner surface of the outer ring substrate, thereby causing the liner to adhere to and extend peripherally around the inner diametrical surface thereof. The liner may also extend substantially across the entire axial width of the ring substrate to enhance the comfort of the ring, which will be described in more detail hereafter.
A plurality of peripherally spaced flexible ribs or protuberances are formed on the liner and extend radially inward therefrom to help facilitate ease of placement and removal of the ring from a person's finger, and to facilitate adjustment to and/or accommodation of variances in ring sizes. In one embodiment, each of the ribs extends generally longitudinally across at least a portion of the axial width of the liner. Each rib is constructed with a generally thin profile that tapers radially inwardly from the inner peripheral surface of the liner, thereby forming a plurality of flexible, resilient rib elements that are configured to readily fold or roll over upon rotation of the ring during placement or removal of the ring upon a finger. By folding over, the flexible ribs facilitate passage of the ring over the generally enlarged knuckle joint of the finger. After passing over the knuckle region, the ribs tend to relax to their original state. This prevents rotation and facilitates proper seating of the ring on the proximal phalanx of the finger; it also enhances the ability for the finger to breathe better underneath the ring.
In another exemplary embodiment, the inner diametrical surface of the outer ring substrate is configured with a liner retention shoulder formed adjacent at least one of the peripheral axial edges of the substrate for helping to retain the liner and resist the “shearing” forces subjected thereto upon transition of the ring on and off the finger. In one embodiment, a liner retention shoulder is formed adjacent each opposite peripheral edge portion of the outer ring substrate, thereby defining a central plateau that extends peripherally around the inner diametrical surface of the ring substrate. The liner then contours and adheres to the profile of the inner diametrical surface of the outer substrate of the ring in interengaging relation, so that much of the “shearing” forces imparted to the liner upon placement or removal of the ring upon the finger are directed into and absorbed by the shoulders formed in the ring substrate.
In still another exemplary embodiment, the outer diametrical surface of the ring substrate may be formed with one or more channel regions or depressions that form an aesthetically pleasing design of choice. These channels may then be configured to connect with one or more flow-through weep holes extending between the inner and outer diametrical surfaces of the ring substrate. This allows the liner material, while in its molten state during the overmolding process, to freely flow from one surface of the substrate to the other. Consequently, the molten liner material is permitted to flow into the channel regions in the outer surface of the ring substrate and adhere thereto to form an outer aesthetically pleasing design to the ring. Notably, once the liner material cures into a hardened state, the liner material extending through the weep holes to the outer surface of the ring will also function as an added retention member helping to secure the liner to the inner diametrical surface of the ring substrate and further prevent dislodgement therefrom.
Example embodiments are also provided herewith for methods for accommodating ring transition and ring fit on fingers of varying sizes. In one example embodiment, a method generally includes providing a ring with an inner diametrical liner having a plurality of flexible, resilient ribs or protuberances which tend to roll over upon rotation of the ring during placement or removal thereof from a finger. In another embodiment, the method generally includes providing an outer ring substrate with a liner retention shoulder that will help to absorb potential “shearing” forces and improve comfort upon placement or removal of the ring upon a finger.
Further areas of applicability will also become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
These and other objects and advantages of the invention will more fully appear from the following description, made in connection with the accompanying drawings, wherein like reference characters refer to the same or similar parts throughout the several views, and in which:
With reference to
In one exemplary embodiment, it is contemplated that the outer substrate 3 of ring 1 be formed of a substantially rigid metallic material, such as gold, platinum or titanium. Here again, however, it is conceivable that other substantially rigid materials could be used in the formation of substrate 3, such has a relatively rigid plastic material, ceramic, or any combination of such materials. For purposes of the intended invention, it is desirable that inner liner 5 be formed throughout of a relatively flexible, pliable and resilient material, such as a thermoplastic elastomer (TPE). In a preferred embodiment of the invention, the use of a self-adhering silicone rubber is contemplated because it exhibits each of these characteristics. Silicone rubber is also known for its superior durability and ability to be formulated to resist aggressive additives that are often found in hand lotions, etc., such as Stearic Acid and Glycol; and, silicone rubber is also a readily moldable plastic material that is suitable for use in an overmolding process such as that preferred for adhering liner 5 to substrate 3 of ring 1 (discussed in more detail hereafter).
A plurality of flexible ribs or protuberances 11 are formed on the inner diametrical surface 13 of liner 5 to help facilitate ease of placement and removal of the ring from a person's finger 12 (see,
Each of the plurality of ribs 11 extends generally longitudinally across at least a portion of the axial width of the liner 5. As shown, in one embodiment, each rib 11 extends axially across the central portion of the liner 5, but stops short of either opposing axial edge 15 or 17 thereof. It has been found that this helps to avoid the potential for any showing of visible markings on the finger 12 caused by such ribs outside the confines of the ring 1. It has been found that shortening the extension of the ribs 11 to terminate approximately 1.00 mm from the liner edges 15 and 17 will prevent any showing of finger markings outside the confines of ring 1. Notwithstanding the above, it is certainly contemplated that such ribs 11 could extend completely to edges 15 and 17 without affecting the functional aspects or departing from the spirit of the invention herein.
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Another significant advantage provided by ribs 11 is the ability for each ring 1 to accommodate multiple finger sizes comfortably, and account for changes or variances in finger size due to aging, weight gain or loss, arthritic conditions, injury, etc. Ring sizing varies between countries, but in the United States, rings are typically sized in ¼ increments (e.g., size 6, 6¼, 6½, 6¾, 7, etc.). Each sizing increment correlates to approximately 0.008 inch variance in inside diameter, or about 0.32 inch total for each full size range (e.g., size 6 through 6¾). Because of the highly pliable, flexible and resilient nature of ribs 11 and their ability to readily fold over when transitioning over the knuckle, it has been found that by appropriately dimensioning the height of each rib 11 (from the inner surface 13 of liner 5 to its apex 19) to be in the approximate range of about 0.06 to 0.07 inch, each ring 1 incorporating liner 5 with ribs 11 can be utilized to comfortably accommodate a full range of at least two (2) complete finger sizes (e.g., size 6 through 7¾). This is significant in that heretofore ring manufacturers and retailers have been required to carry enormous inventories of rings covering all different sizes, in every style, to ensure that they can meet the needs of their customers. With the use of the present invention, the size of these massive inventories can be significantly reduced.
To provide the benefits and advantages described herein, it has been found that the use of silicone rubber having Durometer hardness value falling within the approximate range of 20 to 70 Duro Shore A is acceptable for use in the formation of liner 5; however, for optimal conditions, it is preferred that the hardness value be about 40 Duro Shore A. Although the use of silicone rubber is deemed preferable, it will be understood that the use of other materials is also conceivable, provided such materials are flexible, pliable and sufficiently resilient to facilitate performance of the present invention for its intended purpose. For instance, it is contemplated that other TPE materials or thermoset rubber materials, such as ethylene propylene diene monomer (EPDM), Nitrile, etc., having a similar hardness value range may also be suitable for use in the present invention. Also, it is possible that thermoplastic urethane (TPU) materials of similar hardness may be capable of providing the flexibility and resiliency to adequately function in the present invention. It is also conceivable that any combination of the above materials, or other known flexible and resilient materials, could be utilized in the formation of liner 5 without departing from the invention herein.
In another exemplary embodiment, as shown best in
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As previously noted, in one embodiment, liner 5 is adhered to the substrate 3 of ring 1 through the use of an overmolding process. For purposes of illustration, this overmolding process will now be described in reference to the use of silicone rubber as the material for liner 5, and a metallic material, such as titanium or gold for substrate 3. It is to be understood, however, that other materials and processes known to those skilled in the relevant art are also available for adhering liner 5 to the substrate 3 of ring 1. To overmold liner 5 to substrate 3, it is first noted that it is possible for either a standard or self-adhering formulation of silicone rubber to be utilized in the overmolding process. If a standard silicone formulation is used, at least the inner diametrical surface 7 of substrate 3 is preferably cleaned and prepped with a suitable bonding primer. If the silicone being used is a self-bonding formulation, at least the inner diametrical surface 7 of the substrate 3 preferably undergoes a surface modification process to increase the surface energy of the metal substrate, which helps to promote bonding between the liner 5 and substrate 3. After the substrate 3 is properly prepared for the molding process, it is loaded into a steel overmold tool (not shown). The tool is then loaded into a molding press and, depending on the molding process used (compression, transfer, or injection), silicone rubber is then transferred in its molten state into the cavity where the substrate 3 resides, thereby forming liner 5 and bonding it to the substrate 3.
If the ring requires silicone on the outside surface 9 of substrate 3, as shown in
It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of the invention which comprises the matter shown and described herein and set forth in the appended claims.
This application claims the benefit of U.S. Provisional patent application No. 61/348,897, filed on May 27, 2010 by the same inventors, namely, Ted E. Ahrenholtz and Justin P. Boortz, and entitled “FINGER RING WITH SIZE-ACCOMODATING INNER LINER,”, the entire disclosure of which is incorporated herein by reference thereto.
Number | Date | Country | |
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61348897 | May 2010 | US |