Rimlock for eyeglasses
A rimlock for use with an eyeglass frame is provided. The rimlock comprises a pair of flanges which protrude from the frame at a split therein. A spring is fed through a bore passing through the flanges whereby a portion of the spring internal to the rimlock at a widened portion of the bore is in tension thereby biasing the flanges into engagement allowing the frame to hold a lens in position within the frame. By pulling the flanges apart, the lens can be removed.
1. A lens clamping device for an eyeglass frame for holding a lens in place within said frame, said device comprising a pair of abutments on opposite sides of a discontinuity of said frame, said abutments having a bore passing therethrough, said abutments biased into engagement by a spring located in said bore wherein a portion of said spring within said bore is in tension to bias said abutments into engagement, wherein each said abutment comprises a smaller axial bore passing therethrough and a larger axial bore passing through a portion thereof to define a collar of material, said larger bores arranged adjacent one another and said collars arranged remote one another, said spring threading through each said collar to grip said abutments, said portion of said spring in tension between respective collars, and wherein said spring permits said lens to be removed by separation of said abutments.
2. A device according to claim 1 wherein one of said abutments comprises a bevel about the circumference of its smaller bore to encourage threading of said spring into said smaller bore.
3. A device according to claim 1 wherein each said larger bore is approximately one third of the axial length of its respective abutment.
4. A device according to claim 1 wherein said device comprises a total axial length in the range of 3 mm to 10 mm.
5. A device according to claim 4 wherein said length is in the range of 3 mm to 4 mm.
6. A device according to claim 1 wherein said abutments comprise an equal axial length.
7. An eyeglass device comprising the lens clamping device according to claim 1 .