Wireform attachment mechanism
A wireform attachment mechanism, or support arm, that can be used to attach an earcup to a helmet. The outer end of the support arm can be opened to release the earcup, or closed to clamp onto the earcup.
1. A support arm for use in supporting an earcup on a helmet, comprising:
a wireform element having an inner end portion that is connectable with the helmet;
the wireform element having an outer end portion that can be selectively closed to clamp onto the earcup to keep the earcup supported on the helmet, and that can be selectively opened to enable release of the earcup from the helmet, and
a control assembly of at least two parts that are secured onto the wireform element and that are movable relative to each other and relative to the wireform element between a first position blocking opening of the outer end portion of the wireform element and a second position allowing the outer end portion of the wireform element to be opened.
2. A support arm as set forth in claim 1 wherein the wireform element is a single piece that extends through and from opposite ends of the control assembly, the support arm having a fixed overall length.
3. A support arm as set forth in claim 2 wherein the inner end portion of the single piece wireform element is a loop configured for connection with the helmet, and the outer end portion includes two ends of the single piece wireform element that are formed as prongs that can selectively clamp onto the earcup to support the earcup with in the closed position.
4. A support arm as set forth in claim 3 including stop features far limiting opening and closing movement of the control assembly.
5. A support arm as set forth in claim 1 wherein the w reform element is formed as first and second separate wire pieces that extend from opposite ends of the control assembly, the support arm thereby having a variable overall length.
6. A support arm as set forth in claim 5 wherein the overall length of the support arm is varied by moving first and second parts of the control assembly relative to each other; and
the control assembly is movable to the second position by moving a third part of the control assembly relative to the first and second parts of the control assembly to allow the outer end portion of the wireform element to be opened.
7. A support arm as set forth in claim 6 wherein the first part of the control assembly is fixed for movement with the first wire piece, and the second part of the control assembly movably supports the second wire piece, and the third part of the control assembly constitutes a release tab that is supported on the second part of the control assembly for movement relative to the second part thereby to enable movement of the second wire piece relative to the second part thereby to adjust the overall length of the support arm.