The present invention is in the field of solder-less electrical assemblies.
Electrical assemblies have long used lead solder to help make and keep electrical connections. However, use of solder, and especially lead solder, has come under increasing criticism due to environmental concerns.
The present invention is especially well-suited for, but not limited to use in, footwear, wearing apparel and toys. For an electrical assembly to be useful in such fields it must be compact and inexpensive to manufacture. This means that both the number of parts, as well as the number of manufacturing steps, must be kept to the bare minimum if one is to be competitive in the world today.
The present invention advances simple, compact and easy to manufacture electrical assemblies that are well-suited for use in a variety of applications, including footwear, apparel and toys.
The present invention improves upon prior inventions of the same inventor, including U.S. Pat. Nos. 7,147,337 and 8,004,856.
The present invention is generally directed to a solder-less electrical assembly in which an electrical component with two conductive leads, as well as two conductive wires with a conductor and an insulator, are held within a housing. The conductive wires are inserted into and held by a wire cavity of the housing while each of the two conductive leads is inserted into a lead hole of the housing so that an electrical contact is made with a conductor of one of the conductive wires.
Each of the two conductive leads of the electrical component can have a sharp point which penetrates the insulator when the electrical component is inserted into the housing to create an interference fit between the electrical component and the housing, and the two lead holes can be two channels that guide the two conductive leads into alignment with the conductor to create an electrical contact in which the conductor is compressed against the housing to help secure the electrical contact.
The assembly can include multiple additional electrical components (which may or may not be LEDs) held in similar housings attached their own pairs of wires. When LEDs are to be included in the assembly, multiple LEDs can be included on a single pair of conductive wires, and multiple wires with multiple strings of LEDs that will light in parallel can be included in the assembly, so that more than 6 LEDs and four or more strings of multiple LEDs can be energized by a single battery included within the assembly,
A PCB assembly can be attached to one or more pairs of conductive wires that hold one or more electrical assemblies. A PCB is held in a resilient PCB housing by an interference fit without the use of any solder. The one or more pairs of conductive wires are inserted into a wire cavity of the PCB housing so that exposed portions of the conductor of the conductive wires makes electrical contact with an electrical trace of the PCB and insulation of the wires biases the exposed portions of the conductors into electrical contact with the traces.
A pair of conductors can be held by the PCB housing such that insertion of the PCB into a PCB cavity to form the PCB interference fit forces the conductors into electrical contact with the PCB while the resilient PCB housing biases such contacts and each of the conductors can each be held within a unique channel of the resilient PCB housing which is independently resilient. A battery can be inserted into the PCB housing where it is held by a battery interference fit without the use of any solder and insertion of such battery can cause each of the conductors (which can have a u shape before assembly and then have one or more leads bend over during assembly) make mechanical and electrical contact with the battery to complete an electrical powered circuit. A switch can also be held by a switch interference fit with the resilient PCB housing such that its leads are biased against the PCB by the resilient PCB housing.
Accordingly, it is a primary object of the present invention to provide an improved solder-less electrical assembly.
This and further objects and advantages will be apparent to those skilled in the art in connection with the drawings and the detailed description of the invention set forth below.
The present invention details how various parts can easily be assembled without the use of solder. Although not limited to a final assembly, the present invention is especially well suited to assembly of a package useful for controlling lighting of multiple light emitting diodes (“LEDs”) through movement, which itself is useful in a variety of products, such as, for example, footwear, clothing and toys. It bears note, however, that techniques and assemblies described herein in connection with such usage can be applied to many additional fields.
In the Figures and the following description, number designations indicate various features of the invention, with like number designations referring to like features throughout both the drawings and the description. Although the Figures are described in greater detail below, the following is a glossary of the elements identified in the Figures.
Battery 10, in an especially preferred embodiment, is a lithium 3 volt button cell battery. This type of battery allows positive electrical contact to be made with its upper negative surface 10n and positive electrical contact to be made with either its side surfaces 10s or its bottom surface 10b. In an alternative embodiment, more than one battery can be stacked on top of each other.
Battery block 11, shown in
After conductors 15 and 16 have been assembled to battery block 11, battery 10 is inserted into battery opening 12 formed in battery block 11 where it will be held in place by an interference fit. During insertion of battery 10 into battery opening 12, first lead 15.1 of conductor 15 will come into contact with negative surface ion of battery 10 and be bent over due to the insertion process (see
After battery 10 is inserted into battery block 11, switch assembly 20 can be assembled to battery block 11. Switch assembly 20 can be designed so that it fits into an opening in battery block 11 and can be held in place by an interference fit. Switch assembly 20 has first and second switch assembly leads 20.1 and 20.2 that extend into PCB opening 19 in battery block 11. Switch assembly 20 can be constructed so that it extends above battery block 11, as shown in
After switch assembly 20 has been assembled to battery block 11 (see
After PCB 30 is inserted into PCB opening 19 of battery block 11 it is then inserted into PCB opening 42 of ribbon block 41, although the order of such assembly steps can be reversed.
Ribbon block assembly 40 is an assembly of ribbon block 41 and ribbon wire assembly 50. Ribbon wire assembly 50 has at least one conductive wire 51, and usually groups of multiple conductive wires 51, each of which has an insulative covering 52 surrounding it, with a portion of insulative covering 52 being stripped away (shown as 53 in
Ribbon block assembly 40 is inserted into ribbon opening 43 of ribbon block 41 where it is held in place by an interference fit. Once PCB 30 is fully inserted into PCB opening 42, conductive traces 32 will make electrical contact with conductive wires 51 at exposed portions 53 of insulative covering 52 (see
Electrical assembly 1 of the present invention has many distinct advantages.
One major advantage of electrical assembly 1 is that it can be assembled without the use of any solder. This represents a significant advantage, especially as there is more and more concern about environmental effects of solder.
Another major advantage of electrical assembly 1 is ease of manufacturing and assembly, which greatly reduces cost. Because solder is not required, no soldering iron steps are required, thus reducing cost. Also, electrical assembly 1 can be manufactured from subcomponents with just six assembly steps without using separate connecting parts, which greatly reduces its cost of manufacture. In a similar fashion, multiple PCBs can be electrically connected together in a single electrical assembly in which multiple PCBS are interconnected by use of one or more ribbon block assemblies.
Electrical assembly 1 is particularly well suited for use in applications where it can be used to power LEDs, some examples of which include footwear, clothing and strings of LEDs. In such a use one or more LEDs 60 can be assembled to electrical assembly 1, without the use of solder, by using a wire block assembly for each LED, which will now be described.
Each LED 60 can be assembled to its own pair of conductive wires 51 or multiple LEDs can be assembled on a single pair of conductive wires 51 (see
In accordance with an especially preferred embodiment of the present invention, an LED block 70 (see
After a pair of conductive wires 51 is firmly in place in an LED block 70, first and second LED leads 61.1 and 61.2 of an LED 60 are each brought down and inserted into LED lead cavities 72 of LED block 70. LED lead cavities 72 can be designed to adjust the spacing of LED leads 61.1 and 61.2 and self-align them for insertion into a pair of conductive wires 51. Such self-alignment can be accomplished, for example, by forcing LED leads 61.1 and 61.2 together by narrowing the width of LED lead cavities 72 when the width between LED leads 61.1 and 61.2 is greater than the width of the pair of conductive wires 51 where they will make contact (see
Accordingly, the present invention allows many LEDs to be used in a variety of applications without the need for any solder whatsoever and such construction can be achieved by a simple assembly process that greatly reduces manufacturing cost. This represents a significant advantage over prior art techniques, especially when many LEDs are being combined and electrically connected in parallel on a single pair of conductive wires 51.
So far the present disclosure has disclosed how a number of sub-assemblies can be assembled quickly, simply, and economically without the use of solder. A further embodiment will now be disclosed in which electrical assembly 1 is placed inside of an outer case 100 which can conveniently be constructed of plastic. As illustrated in FIG. 2, outer case 100 has case bottom 102 in which electrical assembly 1 is placed and case cover 101 which is then closed complete a sealed case. In an especially preferred embodiment, either case cover 101 or case bottom 102 has one or male members 103 designed to mate with counterpart one or more female members 104 found in its opposite member. The mating of one or more male and female members serves as an alignment guide as well as increasing structural integrity of a sealed case. After electrical assembly 1 is inserted into case bottom 102 and case cover 101 is closed, the case can be sonic welded. Wires 50 extend out of the sealed case, with the case acting both to insulate electrical assembly 1 and also to help insure the structural integrity of ribbon block assembly 40 which is now bent over ninety degrees by closing of case cover 101 and held in place by the sonic welding (see
While the foregoing disclosure has used the example of an LED as an example of an electrical component held in a housing attached to a pair of conductive wires, the present invention is not limited to only using LEDs, and is meant to cover any electrical component with two conductive leads. Thus, for example, a speaker or audio producing device or some other electrical component such as a sensor, a transducer, a potentiometer, a switch, a motor, a thermocouple or a variable capacitor could be used instead of an LED, and the leads of such components can be constructed and inserted into a suitable housing in the same fashion as the LED leads described in the above disclosure. Accordingly, the disclosure of the present invention can be used to create a variety of assemblies in which multiple electrical components are connected to pairs of conductive wires that are gathered in a ribbon block that is then connected to an assembly which includes a PCB. The assembly which includes the PCB can be constructed to include a battery, in which case it can function as the battery block described above, or it can be constructed so as to not include a battery if the application for the assembly does not require a battery for its source of power. If a battery is included, assemblies can be created in which multiple electrical components, and multiple strings of LEDs that can be energized to emit light in parallel, can all be powered from a single battery source, all of which can be assembled without the use of any solder.
It should also be noted that the teachings of the present invention can also be applied to any electrical component that has three or more conductive leads that are to be connected to three or more conductive wires. In such an embodiment, the housing will have additional lead holes to accommodate the additional leads which will then be guided toward their additional conductive wires in the same fashion that the present disclosures sets forth for two conductive leads and two conductive wires.
Accordingly, the present invention discloses a simple, cost-effective electrical assembly and process of manufacture that is environmentally friendly and, in an especially preferred embodiment, well suited for use with LEDs. Moreover, the electrical assembly is compact and sturdy and well suited for use in a variety of applications, including for use in footwear and clothing.
Although the foregoing detailed description is illustrative of preferred embodiments of the present invention, it is to be understood that additional embodiments thereof will be obvious to those skilled in the art. For example, it is possible to connect multiple electrical assemblies 1 together so that a single switch assembly 20 triggers multiple chains of LEDs to activate at the same time Such an assembly will be particularly useful for footwear and other applications where size and cost is important, but it is desired that a large number of LEDs (e.g., twelve), light at the same time. In addition, it is possible that multiple batteries can be aligned next to each other, instead of on top of each other, where there is more concern about vertical height of an assembled unit than horizontal length of the unit. Also, electrical components with multiple leads, instead of LEDs, can be connected to a pair of conductive wires using an electrical component block that applies the principals stated herein to such components. Further modifications are also possible in alternative embodiments without departing from the inventive concept.
Accordingly, it will be readily apparent to those skilled in the art that still further changes and modifications in the actual concepts described herein can readily be made without departing from the spirit and scope of the disclosed inventions as defined by the following claims.
This application is a continuation-in-part of U.S. Ser. No. 13/294,095, filed Nov. 10, 2011, entitled Solder-Less Electrical Assembly and Process for its Manufacture, the disclosure of which is specifically incorporated herein by reference. This application is also a continuation-in-part U.S. Ser. Nos. 13/646,311, 13/646,376 and 13/646,393, all of which were filed Oct. 5, 2012, the disclosures of which are also incorporated herein by reference.
Number | Date | Country | |
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Parent | 13294095 | Nov 2011 | US |
Child | 13646489 | US | |
Parent | 13646311 | Oct 2012 | US |
Child | 13294095 | US | |
Parent | 13646376 | Oct 2012 | US |
Child | 13646311 | US | |
Parent | 13646393 | Oct 2012 | US |
Child | 13646376 | US |