Photographic film take-up spool

Claim 2

A take-up spool for film having perforations comprising a lower base member rotatable in a forward film take-up direction about a vertical axis and located at an end of said spool, a first wall section exteNding upwardly from said base member parallel to said axis and having an outer cylinderical face and a tail section projecting peripherally, rearwardly, relative to said forward rotation of said base member and having an upper edge which is upwardly, peripherally inclined from the rear end of said tail section, a second wall section extending upwardly from said base member parallel to said axis and having an outer cylindrical face and a tongue section projecting peripherally forwardly beneath and spaced inwardly of said tail section a film perforation engaging tooth projecting radially, outwardly from said second wall section spaced proximate to and rearwardly of the rear end of said tail section and extending outwardly to a point inwardly of a cylindrical plane extending between the outer faces of said wall section, and a shaft extending from said base member above the top of and surrounded by said wall sections and having a peripheral face spaced inwardly from the inside faces of said wall sections.

Claim 3

The take-up spool of claim 1 wherein said shaft includes an enlarged portion disposed above the top of said wall sections and having a peripheral face lying in the curved plane of the outside faces of said wall sections.

Claim 4

The take-up spool of claim 1 wherein the upper edge of said tail section is downwardly, radially inwardly bevelled.

Claim 5

A photographic film take-up spool having a film hodling member comprising: a base member forwardly rotatable in a film take-up forward direction about an axis perpendicular to said base member; a plurality of bent pieces having substantially cylindrical outer faces mounted on and rotatable with said base member and surrounding said axis, each of said bent pieces having rear and forward portions disposed respectively at the rear and front thereof relative to said film take-up forward direction of rotation of said base member and a portion intermediate said forward and rear portions thereof elongated in the axial direction of the spool compared to both front and rear edge portions for forming a mountain-shaped apex on part of said intermediate portion remote from said base member, the rear portion of each of said bent pieces overlapping the forward portion of the next rearwardly disposed bent piece and spaced radially outwardly thereof; a pawl member projecting radially outwardly from the forward portion of each of said bent pieces at a point proximate the rear edge of the next forwardly succeeding bent piece and disposed radially inwardly of the outer face of said rear portion, said pawl being adapted to engage a perforation of the film to be wound; and an inner cylindrical shaft mounted on and projecting from said base member and coaxial with said axis and surrounded by said bent pieces, the peripheral face of said shaft being spaced radially inwardly of the inside faces of said bent pieces.

Claim 6

A photographic film take-up spool having a film hodling member comprising: a base member forwardly rotatable in a film take-up forward direction about an axis perpendicular to said base member; a plurality of bent pieces having substantially cylindrical outer faces mounted on and rotatable with said base member and surrounding said axis, each of said bent pieces having rear and forward portions disposed respectively at the rear and front thereof relative to said film take-up forward direction of rotation of said base member and a portion intermediate said forward and rear portions thereof elongated in the axial direction of the spool compared to both front and rear edge portions for forming a mountain-shaped apex on part of said intermediate portion remote from said base member, the rear portion of each of said bent pieces overlapping the forward portion of the next rearwardly disposed bent piece and spaced radially outwardly thereof; a pawl member projecting radially outwardly from the forward portion of each of said bent pieces at a point proximate the rear edge of the next forwardly succeeding bent piece and disposed radially inwardly of the outer face of said rear portion, said pawl being adapted to engage a perforation of the film to be wound; and an inner cylindrical shaft mounted on and projecting from said base member and coaxial with said axis and surrounded by said bent pieces, the peripheral face of said shaft being spaced radially inwardly of the inside faces of said bent pieces.

Claim 7

A photographic film take-up spool as claimed in claim 4, wherein each bent piece has an end border remote from said base member with an inner periphery tapered radially outwardly towards the upper extremity of the bent piece.

Claim 8

A photographic film take-up spool as claimed in claim 4, wherein said inner cylindrical shaft has a diametrically enlarged portion equal to a radius defined by the outer peripheres of said bent pieces.