CN1036984C - Improved Ring Clamp Housing - Google Patents

Abstract

A ring binder for sheet holders, such as binders or folders, in which the ring binder covers a sheet material for shaping and is provided on each side with at least one rib arranged longitudinally, wherein the rib is provided along a substantial part of the length of the sheet material for the cover on each side of the sheet material for the cover so that the carrier strip in the cover is not easily removed during shaping of the turned edge of the ring binder cover.

Description

Improved Ring Clamp Housing

The present invention relates to ring binders for binders, file folders and the like for holding papers and the like.

A problem identified in the prior art in the manufacture of ring clamps is that the flipped edges of the ring clamp housing members have a tendency to spring back as they are formed. The result is that the edges of the housing members are not formed at the correct angle so that the carrier strips positioned within the housing members tend to come out.

GB-A-2209500 discloses a ring binder mechanism for binders, the rings of which are mounted on a carrier strip located in the casing, wherein the casing is provided with longitudinal indentations to enhance the strength of the mechanism and rigid. The number of indentations is recommended to be 2 or more. In particular, the indentations can be two parallel, symmetrically located on both sides of the housing part. The shape and location of each indentation can be selected to obtain the desired firming effect.

It is an object of the present invention to solve the above-mentioned problems, and/or to provide a useful variant.

In accordance with the present invention, a panel is provided for forming a housing member of a ring clamp to support a pivotable substructure within the ring clamp. The panel is provided with at least one rib along each side thereof, and when the panel is formed into a casing member, there is a portion for supporting a pivotable substructure for the casing member, and these The tendon is located under this part.

This arrangement prevents the side edges of the cover member from bouncing back when the cover member is formed.

Preferably, one or more ribs are provided along most of the length of each side of the shell member panel.

This rib enables the sides of the casing to be correctly perpendicular to the rest of the casing so that the carrier strips inserted in the casing cannot come out.

Preferably, one or more indentations are provided adjacent each side of the shell member panel.

This indentation cooperates with the sides perpendicular to the rest of the housing body to completely prevent the carrier strip from coming out of the housing part during assembly.

It is effective to make the direction in which the dimples protrude from the sheet material for the cover member and the direction in which the ribs protrude are opposite.

An embodiment of the present invention is described in conjunction with accompanying drawing now, wherein:

Figure 1 is a perspective view of a ring clamp according to the present invention;

Fig. 2 is a preformed metal plate, is used for making the casing member of prior art ring clip;

Fig. 3 is a preformed metal plate, is used for making the casing member of ring clip shown in Fig. 1;

Fig. 4 is a cross-sectional view of the sheet material shown in Fig. 3 along line A-A in Fig. 3 .

Shown in Fig. 1 is the ring clip 10 that a binder is used, and this ring clip comprises a base member 12, three ring parts (only draw one among Fig. The opening and closing mechanism 20 (also only draws one among Fig. 1) at base part two ends. The base part 12 comprises a casing part 24 of curved cross-section in the form of an upper rigid structure which supports between its two rolled edges 26 a pivotable substructure 30 which 30 includes a pair of carrier strips 32 along the longitudinal axis of ring clamp 10 that can be opened or closed relative to each other.

The rings 14 are mounted on pivotable substructures 30, in particular one assembly (i.e. assembly 14a) of each ring is mounted on a carrier bar (32) and the other assembly (not shown ) on another carrier strip (also not shown).

Fastening means 34 are then provided on the superstructure 24 to secure the ring clip 10 to a paper clip or the like.

Due to the effect of the opening and closing mechanism 20 installed at both ends of the carrier strips, the two carrier strips 32 can be opened or folded between a lowest position and a highest position.

The opening and closing mechanism 20 is pivotally supported at both ends of the upper rigid structure 24 and engaged with the two ends of the pivotable lower structure 30 respectively, so that the opening and closing mechanism 20 is positioned between the upper and lower structures.

The housing member 24 of the ring clamp 10 is formed from a preformed sheet metal stamped with a metal die.

A prior art preformed metal plate 36 is shown in Fig. 2. This plate is a flat strip with six grooves 37 for passing through the ring 14 when the ring clamp is assembled. Each has a notch 41 in which the opening and closing mechanism 20 is seated when the ring clamp is closed. Also on the plate 36 are two holes 39 through which the fastening means 34 attach the ring clip to a paper clip or the like, these holes 39 being punched out only when the casing is formed. Each side of the panel 36 is press-formed with a pair of metal dies such that each side is bent at approximately 90 degrees to the remainder of the panel. However, due to the rebound elasticity of the metal itself, the folded side will deviate from the above-mentioned 90 degrees outward by a slight angle.

In particular, when the metal sheet 36 is forcibly formed into the shell member, its inner and outer faces are respectively subjected to compressive and tensile forces. When the dies separate, the sheet releases from the stress and bounces outward, thus creating a slight deflection angle between the sheet side and the vertical. In this regard, the materials used and the thickness are different, and the elasticity of the rebound is also different.

This unintended deviation angle can affect the efficiency and speed of the assembly process.

In order to solve this problem, it is best to manufacture the desired curved edges while the sheet is still in the die, which can be done by simply forming the edges along each side on the preformed sheet 40 (see Figure 3). Several ribs 38 protruding vertically and protruding outward from the board can be arranged on the side.

When this modified sheet metal 40 is pressed in the die, the upper forming die first contacts the ribs 38 and pushes the sheet into the forming die. In particular, due to the arrangement of the ribs 38, the two sides of the panel can be further bent toward the vertical (inwardly), forming a slight inward deviation from the vertical. When the die is opened, due to the rebounding elasticity of the sheet material 40, it rebounds outward again, so that the deviation angle of the prior art can be reduced or even eliminated, and the sides perpendicular to the remaining parts of the shell are formed. Parallel, which is exactly what needs to be achieved.

When the sides of the housing part are provided exactly perpendicular to the rest of the housing part, assembly is facilitated because the carrier strip 32 inserted into the housing part is no longer easy to come out therefrom.

Four indentations 42 are also provided on the plate 40, and the direction of the indentations protruding from the plate is just opposite to that of the ribs 38 (ie protruding inwardly). The protrusions formed by these indentations 42 together with the sides perpendicular to the rest of the housing part completely prevent the carrier strip 32 inserted in the housing part from coming out of the housing part during assembly.

Claims (8)

1. A sheet of material for forming a casing member (24) for supporting a pivotable substructure (30) in a ring clamp (10), the sheet of material (40 ) is provided with at least one rib (38) along each side thereof, and is characterized in that: when the sheet material (40) is formed into a casing member (24), there is a position for the casing The member (24) supports the pivotable substructure (30), and the ribs (38) are located below this part. 2. Panel according to claim 1, characterized in that said ribs (38) are provided on each side of said panel (40) along most of the cardinality. 3. A panel according to claim 1 or 2, characterized in that at least one indentation (42) is provided in the vicinity of each side of said panel (40). 4. A panel according to claim 3, characterized in that said indentations (42) protrude from the panel (40) in a direction opposite to the direction in which said ribs (38) protrude. 5. A ring clamp formed from sheet metal, comprising a casing member (24) supporting a pivotable lower structure (30), and a plurality of ring members (14) mounted on the lower structure (30) On, this casing member (24) comprises at least one rib (38) along each side thereof, is characterized in that: There is a position for casing member (24) to support pivotable substructure (30) , and these tendons (38) are located below this position. 6. A ring clamp according to claim 5, characterized in that said ribs (38) are provided along most of their length on each side of said housing member (24). 7. A ring clamp according to claim 5 or 6, characterized in that at least one indentation (42) is provided adjacent each side of said casing member (24). 8. A ring clamp according to claim 7, characterized in that said indentations (42) protrude from the housing member (24) in a direction opposite to the direction in which said ribs (38) protrude.

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