Patent GB-191312534-A (GB)
Title: Improvements in and relating to Expansible Files or Binders.
Inventor: PETTY JOHN PAXTON
IPC: B42F13/12
Filed: 1913-05-29
Granted: 1914-05-14
Abstract: 12,534. Petty, J. P. May 29. [Cognate Applications, 15,017/13 and 17,766/13.] Post files; covers.-Relates to expansible files or binders of the type in which the papers, sheets, &c. are gripped between movable clamping-members between which the sheet-engaging posts extend. According to the invention, the posts are detachably combined at their upper ends without endwise fastening with the corresponding clamping-member and are adapted to permit the relative movement of the clamping- members for gripping or releasing the papers, the posts being constructed either of sections having no positive end-to-end connexion, or as a unit length having no positive endwise connexion with its support, or as self-expanding telescopic posts suitable for extension by the addition of sections. The movement of the clamping-members towards or away from each other is admitted either by a telescopic relation between the component parts of the posts, or between the posts and the upper clamping- member. The upper clamping-member is readily detachable from the posts, either for the purpose of attaching additional sections to the posts or for using the binder in connexion with a billing or accounting machine, or for facilitating the removal or addition of papers. In the construction shown in Fig. 3, the posts 1 are constructed in a known manner of telescopic sections 2, 3 normally urged apart by means of a spring, the section 2 engaging a recess 11 in the upper clamping-member 8 without having any positive endwise connexion with this clamping- member. The binder is operated by any convenient means such as a sprocket and chain mechanism 21, and a separation of the clamping- members 5, 8 is automatically accompanied by an expansion of the posts 1 whereby the released papers are always maintained in alinement. The capacity of the binder may be increased by extending the posts by the addition in a known manner of sections 13, Fig. 5, having a non- positive connexion with the section 2 or with each other. The section 2 or the sections 13 are adapted for ready connexion with the swinging arms of a billing or accounting machine. One or more short posts 16 may be attached to the lower clamping-member 5 for the known purpose of ensuring alinement of those sheets which engage the reduced portions 3 of the posts when the posts are in an expanded condition. In the modification shown in Fig. 6, a telescopic relation between the posts 17 and upper clamping- member 8 is obtained by providing the member 8 in a known manner with deep recesses 18 engaging the outer ends 19 of the posts. The posts 17 are either built up in sections or have a non-positive connexion with the lower clamping-member 5 in order that they may be readily interchanged with posts of different lengths. In a further modification, the binder is provided both with self-expanding telescopic posts and also with the non-telescopic posts as shown in Fig. 6, all the posts having no positive endwise connexion with the upper clamping-member 8.