Binder device releasably engaging aperture or notch of sheet – Sheet retainer travels arcuate path – Travel in plane perpendicular to axis of rotation
Patent
1996-04-19
1997-12-16
Howell, Daniel W.
Binder device releasably engaging aperture or notch of sheet
Sheet retainer travels arcuate path
Travel in plane perpendicular to axis of rotation
402 34, 402 69, 402 70, B42F 1324
Patent
active
056977220
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ring binder mechanism with a base plate mountable in a binder or ring binder and at least one spring closure mechanism consisting of a filing pin and a tube, both being perpendicularly secured to the base plate, a closing bow being mounted slidingly in longitudinal direction and being rotatable to open and close the mechanism, and a spring acting on the closing bow.
Such a ring binder mechanism has become known from German patent DE-C 36 856. The tube shows an inner diameter corresponding to the outer diameter of the closing bow. In the tube a compression spring is provided, which is mounted between the base plate and the one end of the closing bow arranged in the tube. On the closing bow there is arranged a pin engaging with a Z-like guiding slot on the tube. Therewith the movement of the closing bow is guided when being opened and closed on the one hand, whereas the closing bow is held in its closed position against the closing force of the spring.
Disadvantageously the compression spring is biased in the opening direction. Thereby there always exists the risk that the closing bows open by an unintentional rotation and are left open by the compression force of the spring.
Common to other known systems is the absence of the guiding slot in the tubular part. This known ring binder mechanisms comprises a relatively complicated construction comprising several component parts. Also increased expenditures for assembling are necessary.
The invention aims at providing a new ring binder mechanism, which avoids the above-mentioned drawbacks of the known ring binder mechanisms, has a simple design, requires reduced expenditures for assembling and can be easily handled.
This aim is achieved with the inventive ring binder mechanism in that the tube is provided with an inner diameter being greater than the diameter of the closing bow, in that the end of the tube being opposite to the base plate is closed, in that the closed part is provided with a bore, through which the closing bow is guided and whose diameter corresponds to the outer diameter of the closing bow, in that the closing bow further comprises a preferably disk-shaped bulge, whose diameter corresponds to the inner diameter of the tube, and in that a pressure spring is mounted between the bulge and the closed part to generate a closing force in the direction of the filing pin.
The invention is described in detail with the aid of the drawings.
FIGS. 1 and 2 show ring binder mechanisms in closed state;
FIG. 3 is the schematic sectional view of the spring system in closed state;
FIGS. 4 and 5 show the ring binder mechanism in open state;
FIG. 6 is the schematic sectional view of the spring system in open state;
FIGS. 7 and 8 show the ring binder mechanism in open state, wherein the closing bows are in a rotated position;
FIG. 9 is the schematic sectional view of the spring system in open state with a rotated position of the closing bow;
FIGS. 10 to 12 are enlarged views of the tube with inserted pressure spring between the closed part of the tube and the disk-shaped bulge at the end of the closing bow as well as of the fixation of the tube on the base plate.
The inventive ring binder mechanism consists preferably of two spring closure mechanisms mounted on a common base plate 7. The spring closure mechanism consists of a filing pin 1 and a tube 3 both being perpendicularly secured to the base plate 7, as well as a closing bow 2 being mounted slidingly in longitudinal direction and being rotatable in the tube 3 to open and close the mechanism, and a pressure spring 4 being mounted between a disk-shaped bulge 5 of the closing bow 2 and the closed part 3" of the tube 3 to generate a closing force in the direction of the filing pin 1.
The tube 3 is fastened to an annular support disk 6 by a screw or rivet 6'. The disk 6 is fastened on the base plate 7 by riveting.
Preferably the disk-shaped bulge 5 of the closing bow 2 is provided with a projection 5' and there is provided a guiding slot 3' in the tube 3, with which engages the p
REFERENCES:
patent: 436533 (1890-09-01), Merk
patent: 1180849 (1916-04-01), Hill
patent: 1705306 (1929-03-01), O'Neil
patent: 3104667 (1963-09-01), Mintz
patent: 3762823 (1973-10-01), Gregson
patent: 3785740 (1974-01-01), Strong
patent: 4009599 (1977-03-01), Patriquin
patent: 5509745 (1996-04-01), Hegarty
Hladik Herta
Igler Hans
Hladik Herta
Howell Daniel W.
Krolikowski Julie A.
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