Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
273 words
In a spool for photographic film 1 having a winding shaft 3 for attaching the end of the film 1 and winding the film 1 thereon, and a pair of flanges 4, 4' for checking the movement of the film 1 wound round said winding shaft 3, in the axial direction of the shaft 3, the improvement wherein a film-insertion slit 5 is provided between the two flanges 4, 4' of said winding shaft 3, and two engagement pawls 9, 10 are provided separately from each other in the axial direction of the winding shaft 3, in part of one of the upper and lower walls 6, 7 of said film-insertion slit 5 facing the other wall, while a comparatively narrow film-presser rib 8 is provided in part of the other wall facing the first wall between said two engagement pawls 9, 10; wherein each of said engagement pawls 9, 10 has an inclined part ascending toward the other wall gradually in the direction of film-insertion, and a horizontal pawl part continuing from said inclined part; wherein each of said horizontal pawl parts is shaped in accordance with part of a virtually oval engagement hole 2, 2' formed in the end of the film 1, and has a film engagement section inclined toward the first wall and toward the film-insertion side of the slit 5 and is separated a distance from the first wall slightly larger than the thickness of the film 1; and wherein said film-presser rib 8 has an inclined surface descending toward the first wall gradually in the direction of film-insertion, and a horizontal surface continuing from said inclined surface.
Claim 2
Dependent Claim
273 words
In a spool for photographic film 1 having a winding shaft 3 for attaching the end of the film 1 and winding the film 1 thereon, and a pair of flanges 4, 4' for checking the movement of the film 1 wound round said winding shaft 3, in the axial direction of the shaft 3, the improvement wherein a film-insertion slit 5 is provided between the two flanges 4, 4' of said winding shaft 3, and two engagement pawls 9, 10 are provided separately from each other in the axial direction of the winding shaft 3, in part of one of the upper and lower walls 6, 7 of said film-insertion slit 5 facing the other wall, while a comparatively narrow film-presser rib 8 is provided in part of the other wall facing the first wall between said two engagement pawls 9, 10; wherein each of said engagement pawls 9, 10 has an inclined part ascending toward the other wall gradually in the direction of film-insertion, and a horizontal pawl part continuing from said inclined part; wherein each of said horizontal pawl parts is shaped in accordance with part of a virtually oval engagement hole 2, 2' formed in the end of the film 1, and has a film engagement section inclined toward the first wall and toward the film-insertion side of the slit 5 and is separated a distance from the first wall slightly larger than the thickness of the film 1; and wherein said film-presser rib 8 has an inclined surface descending toward the first wall gradually in the direction of film-insertion, and a horizontal surface continuing from said inclined surface.
Claim 3
Dependent Claim
25 words
The spool for photographic film according to claim 1, in that the side edge of the first wall, on the film-insertion side, is rounded off.
Claim 4
Dependent Claim
33 words
The spool for photographic film according to claim 1, in that the distance from the lower wall 7 to the lower surface of the pawl part 9a is not less than 0.3 mm.