Film stretching structure
First Claim
1. A film stretching structure for stretching a film or a sheet comprising:
- a frame structure having a support surface for supporting a film to be stretched at an end edge portion thereof;
gap forming means for forming a gap in the support surface of the frame structure;
stretching means associated with said frame structure, said stretching means being adapted to be forced into the gap together with the end edge portion of the film placed on the support surface of the frame structure so as to tar cover the gap; and
holding means for securely holding the stretching means in place in the gap so that the film is pulled toward the gap and kept taut by the stretching means forced into the gap.
1 Assignment
0 Petitions
Accused Products
Abstract
A film stretching structure holds a non-self-supporting film, sheet or the like taut so that the film, sheet or the like may not crease or slacken. The film stretching structure comprises a frame structure having, as principal components, a quadrangular outer frame having two opposite side members for supporting a film, a sheet or the like thereon, and an inner frame having side members substantially parallel to those of the outer frame, respectively, and disposed inside the outer frame so as to form gaps between the side members of the outer frame and the corresponding side frames of the inner frame, respectively, and bar-shaped stretching members. A film, a sheet or the like is supported on the two opposite side members of the outer frame, and the stretching members are pushed together with portions of the film, the sheet or the like into the gaps contiguous with the opposite side members of the outer frame supporting the film, the sheet or the like to stretch the same. The film stretching structure has a relatively simple construction and is capable of holding the film, the sheet or the like taut without allowing the same to crease or slacken.
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Citations
24 Claims
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1. A film stretching structure for stretching a film or a sheet comprising:
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a frame structure having a support surface for supporting a film to be stretched at an end edge portion thereof; gap forming means for forming a gap in the support surface of the frame structure; stretching means associated with said frame structure, said stretching means being adapted to be forced into the gap together with the end edge portion of the film placed on the support surface of the frame structure so as to tar cover the gap; and holding means for securely holding the stretching means in place in the gap so that the film is pulled toward the gap and kept taut by the stretching means forced into the gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification