Loose-leaf binder

Abstract

The invention provides a binder integrally made of plastic, performing opening action divided into two stages in rotor ring and preventing the binder from being fallen off, as well as providing a narrow first opening state capable of inserting few binders and wider second opening state capable of inserting a plurality of binders.

Description

technical field [0001] The invention relates to a binder. Background technique [0002] Conventionally, there are a large number of binders in which a plurality of fixing rings are provided on one side of an elongated plastic substrate, and a ring supported by a shaft member is arranged on the other side. A plurality of movable rings are rotatable and can be freely opened and closed by locking with a fixed ring. Loose-leaf papers provided with insertion holes corresponding to the rings are detachably stapled to such rings. [0003] Such prior binders include the following binders, etc., as described in Japanese Patent No. 3749893 (Patent Document 1), attached to this specification Figure 24 as well as Figure 25 As shown in the number 400, the shaft member is packed into a metal coil spring 408, so that when the movable second half-ring element 402 with a hook-shaped engaging means 405 is twisted with a finger, the first half-ring element 402 can be moved from the fixed fi...

AI Technical Summary

Problems solved by technology

[0004] However, in the binder of this structure, in addition to preparing spring members with different sizes and spring forces or lengths for the binder, a more complicated structural part must be carefully designed so that on the shaft member and the base material, Assembling the above-mentioned spring member without detaching from the base material and without impairing the effective spring action, there is a problem in terms of manufacturing time or cost, and there is also a problem that a metallic shaft is used in order to improve the durability of the coil spring-related members. component, which can cause weight gain or rust

In addition, it takes labor and time to sort metal springs when they are discarded

In addition, especially the technology of the above-mentioned Japanese Patent No. 3749893 has the following problem. If the ring is opened, the semi-rings will be opened suddenly, causing the bound loose-leaf to be scattered.

[0005] On the one hand, although as explained in Japanese Patent No. 3407672 (Patent Document 2), especially paragraph (0024), the following binder is proposed, which is provided with a low protrusion on the outer periphery of the shaft body, and the bearing A concave-convex sliding joint corresponding to the low protrusion is formed on the inner periphery of the part. Through the contact action between the low protrusion and the sliding joint, the rotation of the shaft body has a moderate sense, but the low protrusion is only used to make the shaft body Although it is described that paper can be taken out or put in at a predetermined position (paragraph 0032), it does not have sufficient braking force to stop at a predetermined position, and cannot provide a substitute for promoting ring opening. previous spring force for closing action

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