Wireless key fob for vehicles
View Patent ↗A key fob assembly comprises an electronic circuit comprising a substrate carrying a plurality of switching elements and a display element. A rear casing member having a first outer rim and receives the electronic circuit. A front casing member has a second outer rim, a plurality of button apertures, and a display window. The button apertures are substantially aligned with the plurality of switching elements and the display window is substantially aligned with the display element. A lens is contained within the display window providing a protective layer over the display element. An elastomeric seal member is provided having an outer periphery captured between the first and second outer rims and having a display aperture defined by an edge wherein the edge is captured between the display element and at least one of the front casing member and the lens. The elastomeric seal member includes a plurality of pedestals aligned with respective ones of the button apertures. A plurality of substantially rigid button caps are each cohered to a respective one of the pedestals and project into a respective one of the button apertures, whereby a button cap can be depressed toward the substrate to actuate a respective one of the switching elements.
1. A key fob assembly comprising:
an electronic circuit comprising a substrate carrying a plurality of switching elements and a display element;
a rear casing member having a first outer rim and receiving said electronic circuit therein;
a front casing member having a second outer rim, a plurality of button apertures, and a display window, wherein said button apertures are substantially aligned with said plurality of switching elements, and wherein said display window is substantially aligned with said display element;
a lens contained within said display window providing a protective layer over said display element;
an elastomeric seal member having an outer periphery captured between said first and second outer rims and having a display aperture defined by an edge wherein said edge is captured between said display element and at least one of said front casing member and said lens, wherein said elastomeric seal member includes a plurality of pedestals aligned with respective ones of said button apertures; and
a plurality of substantially rigid button caps each cohered to a respective one of said pedestals and projecting into a respective one of said button apertures, whereby a button cap can be depressed toward said substrate to actuate a respective one of said switching elements.
2. The assembly of claim 1 wherein said lens is joined with said front casing member by insert molding.
3. The assembly of claim 1 wherein a first side of each of said pedestals facing said button caps includes a respective air relief channel.
4. The assembly of claim 1 wherein a second side of each of said pedestals facing said electronic circuit includes a respective actuator post for actuating a respective switching element.
5. The assembly of claim 4 wherein said elastomeric seal member includes air relief channels interconnecting said second sides of said pedestals.
6. The assembly of claim 1 , wherein each button cap includes a unique graphic appearing thereon, wherein each of said pedestals has a unique keyed shape, and wherein each respective button cap has a matching shape for installing only on a matching pedestal.
7. The assembly of claim 1 wherein said pedestals each include a central cavity, wherein said button caps each include an outer sleeve receiving a respective pedestal, and wherein said button caps each include an inner stem received in a respective central cavity.
8. The assembly of claim 7 further comprising adhesive joining said outer sleeves and said inner stems to respective pedestals.
9. The assembly of claim 1 wherein said front casing member includes a plurality of guide walls defining said button apertures.
10. The assembly of claim 9 wherein said button caps are recessed within respective guide walls.
11. The assembly of claim 9 wherein said button caps are flush with said front casing member.
12. The assembly of claim 1 wherein said elastomeric seal member comprises a flange at said outer periphery.
13. The assembly of claim 12 wherein said front and rear casing members include a plurality of snap tabs for locking said front and rear casing members together and wherein said flange includes a plurality of notches for receiving said snap tabs.
14. The assembly of claim 1 wherein said edge of said display aperture in said elastomeric seal member is beveled and wherein said front casing member includes a matching chamfer around said display window.
15. The assembly of claim 1 further comprising a remote keyless entry antenna coupled to said electronic circuit, wherein said remote keyless entry antenna is comprised of a wire conductor, wherein said front and rear casing members cooperatively define a chamber outside of said first and second outer rims for receiving said antenna, and wherein said flange includes an antenna slot having said wire conductor passing therethrough.
16. The assembly of claim 15 wherein said wire conductor comprises a tapered helix within said chamber.
17. The assembly of claim 16 wherein said helix is substantially rectangular.
18. The assembly of claim 1 wherein said electronic circuit comprises a remote keyless entry transmitter.