FR2722733A1 - Spiral binding assembly for loose-leaf pages - Google Patents

Abstract

The spiral is defined by a series of identical helical turns (a-d) extending along its length, with an end turn (e) of different configuration. The main group of turns are of identical thickness (l) which is less than the thickness (L) of the end turn. The end turn extends round cylindrically to define a slot (f) whose edge faces are parallel to each other. A group of pages to be bound by the spiral are formed with a series of identical holes (m-p) and a larger end slot (k). When the spiral is inserted through the page holes, one edge (g) of its end turn contacts the front face of the front page, while the other edge (h) contacts the rear face of the rear page above the slot.

Description

 The metal helical scrolls of page binders as they are currently manufactured require their ends to be folded back to prevent them from being unscrewed and emerging from the perforations of the pages where they are installed.

 Folded towards the axis of the spiral, it becomes difficult to get hurt with the ends of the thread that is sharp.

 Such spirals are of delicate construction requiring specific tools for forming and setting up. They are fragile because they deform easily with the crash. In addition, it is necessary to provide a protection of the wire to prevent it from being corroded following contact with perspiration of the hands.

The present invention relates to a spiral helicoidal plastic material for making a binding
Binding is understood to mean any product of the type book, notebook, binder, notepad, diary, whose binding is feasible with a helical spiral.

This invention overcomes the disadvantages of the existing metal spiral spiral.

 The accompanying drawings illustrate an embodiment of the invention applied to booklet pages.

 Figure 1 shows the spiral alone seen from the front.

 Figure 2 shows the perforations of a page.

 Figure 3 shows the spiral in the mounting course.

 Figure 4 shows the spiral mounted on a book with the book closed.

 Figure 5 shows the spiral mounted on a book with the book open.

 Figure 6 shows in section a mold used for the implementation of the molding process designed specifically for the manufacture of the spiral according to the invention.

 The description of the invention is made from a helical spiral rotating on the left, comprising a ribbon of a thickness, a height, a number of turns may be different from the characteristics of the one chosen for the presentation, while remaining within the scope of the invention.

Figure 1 includes a spiral pattern (A) binding
page with four turns (a), (b), (c), (d) identical
extended by a turn ive).

The turns (a), (b), (c), (d) have an identical height (1)
and measuring less than the height (L) of the turn (e).

The turn (e) has a slot (f) delimited by the
sides (g) and (h).

These sides (g) and (h) are inclined with respect to the axis
(i) helical turn.

Figure 2 has a page (j) pierced with holes
(k), (m), (n), (o), (p) which will respectively receive, once
the coil placed, the sections of the turns (e), (a), (b), (c), (d).

The holes (m), (n), (o), (p), are of widths
(q), (r), (s), (t) increasing in this representation,
(q <r <s <t) to facilitate the setting up of the spire
by limiting its longitudinal twist as it is
shown in Figure 3. This feature is not
limiting.

The spiral (A) is introduced by its end (u)
, rounded to avoid being hurtful, in the hole (m), then
rotation through the holes (n), (o) and (p) until the
flange (g) comes into contact with a set of pages (j).

At this stage, the slot (f) is opened by spacing its
sides (g) and (h) using the elasticity of the material
spire plastic (e), the plastic material
the turn being chosen for its ductility, its memory at the
deformation, its resistance to corrosion: characteristics
filled for example with a polyurethane.

When the slot (f) is sufficiently open, the side (h) is
introduced by the holes (k) of the different pages (j).

The effort to maintain the gap of the slot (f) is
released.

The slot finds by elasticity its initial configuration
and the spiral is held in place figure, 4 and 5.

 Free in rotation, this spiral is locked in one direction, the side (g) comes into contact with a face of the first page (j), below the hole (k), between the holes (k) and (m), and in the other direction when the face (h) comes into contact with the opposite side of the last page (j) above the hole (k).

 This spiral can be installed both by hand and with a specific machine setting up.

 The spire (e) can be given a dimension sufficient for the spiral to be personalized by a specific marking. This marking can come directly from molding and / or be reported by screen printing, adhesive label, paint, etc.

 Figure 6 comprises a sectional representation of an injection mold of the spiral (A) consisting of three parts (s), (C), (D). The piece (B) is fixed and has the imprint of the spiral (A) to its generator.

 The piece (D) is movable according to the movements (E1) and (E2) opening and closing of the mold and comprises the other half of the spiral impression (A) to its generator. The piece (C) is a cylindrical core movable according to the movements (F1) and (F2). The diameter of this core (C) corresponds to the inner diameter of the spiral (A).

 First, the three pieces (B), (C), (D), are assembled as in FIG. 6, the plastic is injected via the channel (G) into the housing of the spiral (A) that delimit the three pieces (B), (C), (D).

 After cooling the workpiece (D) is moved away according to the movement (El), the core (C) is removed according to the movement (F1) and the workpiece (A) is removed from the workpiece (B) via the ejectors ( H) according to their movement (I1).

 The ejectors (H), the core (C), the part (D) return to their initial position according to the respective movements (I2), (F2), (E2); At this point the injection cycle can start again.

Claims (3)

REVEDDICATIONS 1- helical spiral for making a binding and binding comprising this spiral characterized by the fact that the spiral (A) consists of the turns (a), (b), (c), (d), etc. a turn (e), that the turns (a), (b), (c), (d), etc. have a height (1) identical and measuring less than the height (L) of the turn (e), that the turn (e) has a slot (f) delimited by the sides (g) and (h) such that, free in rotation, this spiral is locked in one direction, the side (g) coming into contact with a face of the first page (j), below the hole (k), between the holes (k) and (m), and in the other direction when the face (h) comes into contact with the opposite side of the last page (j) above the hole (k) of the pages (j) of the binding that it makes. 2- helical spiral for making a binding and binding comprising this spiral, according to the preceding claim, characterized in that the pages (j) are pierced with holes (k), (m), (n), (o), (p), etc.and that the spiral (A) is introduced through its end (u), into the hole (m), then by rotation through the holes (n), (o), (p), etc.  until the rim (g) comes into contact with a set of pages (j), that the slot (f) is opened by spacing its sides (g) and (h) using the elasticity of the plastic material of the turn (e), that the slot (f) is sufficiently open so that the sides (h) are introduced through the holes (k) of the different pages (j), that the effort to maintain the spacing of the slot (f) ) is released, and that the slot (f) regains elasticity by its initial configuration 3- Spiral helical for making a binding and binding comprising this spiral, according to claim 1 or 2, characterized in that the sides (g) and (h) are inclined with respect to the axis (i) of the helical turn. 4- helical spiral for making a binding and binding comprising this spiral, according to claim 2, characterized in that the holes (m), (n), (o), (p), etc. are of widths (q), (r), (s), (t), etc. increasing, (q <r <s <t) to facilitate the establishment of the turn by limiting its longitudinal twist. 5. helical spiral for making a binding and binding comprising this spiral, according to claim 1, characterized in that it is made with an injection mold consisting of three pieces (B), (C), (D) , that the part (B) is fixed and has the impression of the spiral (A) to its generator, that the part (D) is movable according to the movements (E1) and (E2) opening and closing of the mold and comprises the other half imprint of the spiral (A) to its generatrix and that the part (C) is a cylindrical core movable following the movements (F1) and (F2).