Binding post construction

Claim 2

In combination with a paper block having bores therethrough, binding posts for binding together the sheets of the block, each post comprising a pair of interengaging, complementary resilient parts, the parts of each post extending into one of said bores from opposite ends of the bore, the outer end of each part having enlarged means engaging the outer face of said block adjacent the bore, the post within a bore with its two parts assembled having a generally cylindrical exterior and a hollow interior formed by a longitudinal passage extending from end to end of the post and through each of said enlarged means and a separate expansion element having a diameter slightly larger than that of the passage, the expansion element being inserted into the post passage to expand the resilient post parts and force them outwardly into tight engagement with the wall of the paper block bore in which the post is positioned, the expansion element being removable from the post passage by pushing it out either end thereof whereby the post parts are allowed to spring back into unexpanded position and can be removed from the paper block.

Claim 3

Structure as defined in claim 1 wherein the posts have a generally tubular cross section, and each part of a post comprises at least one sector shaped piece of the post tubular wall.

Claim 4

Structure as defined in claim 1 together with front and back covers for the paper block, the two parts of each post being respectively connected to the two covers.

Claim 5

In combination with a paper block and front and back covers on opposite sides of said block, the block and covers having bores adjacent one edge thereof; binding posts for binding together the sheets of the block and covers, each post comprising a pair of interengaging, complementary resilient parts connected respectively to the front and back covers, parts of each post extending into one of said bores from opposite ends of the bore, the post with its two parts assembled within a bore having a generally cylindrical exterior of substantially uniform diameter from end to end and a hollow interior formed by a longitudinal bore extending completely through the post and through each cover, and a separate expansion element having a diameter slightly larger than that of the post bore, the expansion element being inserted into the bore to expand the resilient post parts and force them outwardly into tight engagement with the wall of the paper block bore in which the post is positioned so that the sheets of the block and covers are bound together, the expansion element being removable from the post bore by pushing it out either end thereof whereby the post parts are allowed to spring back into unexpanded position and can be removed from the paper block.

Claim 6

In combination with a paper block and front and back covers on opposite sides of said block, the block and covers having bores adjacent one edge thereof; binding posts for binding together the sheets of the block and covers, each post comprising a pair of interengaging, complementary resilient parts connected respectively to the front and back covers, parts of each post extending into one of said bores from opposite ends of the bore, the post with its two parts assembled within a bore having a generally cylindrical exterior of substantially uniform diameter from end to end and a hollow interior formed by a longitudinal bore extending completely through the post and through each cover, and a separate expansion element having a diameter slightly larger than that of the post bore, the expansion element being inserted into the bore to expand the resilient post parts and force them outwardly into tight engagement with the wall of the paper block bore in which the post is positioned so that the sheets of the block and covers are bound together, the expansion element being removable from the post bore by pushing it out either end thereof whereby the post parts are allowed to spring back into unexpanded position and can be removed from the paper block.

Claim 7

A binding post assembly as defined in claim 4 wherein said post parts are formed integrally with their respective covers.

Claim 8

A binding post assembly as defined in claim 4 wherein the hollow posts have a generally tubular cross section, and each post part comprises a plurality of longitudinal sections of the post wall spaced from one another to receive therebetween the spaced longitudinal sections of its complementary post part.