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Device-for-the-fold-free-stretching-and-holding-of-liquid-crystal-films

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Device for the fold-free stretching and holding of liquid crystal films

Details

Inventors: Jennen, Friedrich; Linden, Hermann;
Assignee: Troponwerke Dinklage & Co. (Cologne, DT)
Primary Examiner: Lawson; Patrick D.
Assistant Examiner:
Attorney, Agent or Firm: Burgess, Dinklage & Sprung

A frame for holding and stretching liquid crystal films for thermographic diagnosis of cutaneous and sub-cutaneous disorders. A foil coated with the liquid crystals is held and stretched by the frame. The frame comprises an outer member 1 which is secured to inner member 2 by clips 3 registering in openings 8. The frame members are contoured so the stretching is effected without formation of folds.

DETAILED DESCRIPTION What is claimed is: 1.
A device for the fold-free stretching and holding of liquid crystal films, comprising a substantially rectangular outer frame having an external centering edge and an insertable inner frame comprising an inner centering edge, wherein the inner boundary of the inner frame is in the form of a stretching collar, the surface of the collar facing the inner frame centering edge being bevelled, the lower edge of the stretching collar being rounded off and its surfaces being smooth, the surface of the stretching collar facing away from the inner frame centering edge being bevelled at a steeper angle than that surface facing the inner frame centering edge, and wherein the outer frame comprises a stretching groove which cooperates with the stretching collar and the surface of the outer frame directed towards the inner edge of the inner frame is bevelled parallel to the bevel of the stretching collar, the corners of the inner boundry of the outer and inner frame being rounded off, the outer frame being insertable in the inner frame by cooperation of the inner and external centering edges and cooperation of stretching collar and stretching groove.
2.
A device as claimed in claim 1, wherein clips arranged on the inner frame engage in openings formed in the outer frame.
3.
A device as claimed in claim 1, wherein a double adhesive tape is arranged on the inside of the outer frame.
4.
A device as claimed in claim 2, wherein a double adhesive tape is arranged on the inside of the outer frame.
5.
A device as claimed in claim 1, wherein said corners are rounded with a radius of 20 to 25 mm.
6.
A device as claimed in claim 4 wherein said corners are rounded off with a radius of 20 to 25 mm.
7.
A device as claimed in claim 2, wherein the clips are spaced from and disposed outwardly of the inner frame stretching collar.
8.
A device as claimed in claim 7, wherein the clips are disposed intermediate the inner frame stretching collar and the inner frame centering edge

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