JPH0753476B2 - Improved backing metal fitting for binder binding and method of processing improved backing metal fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binder binding device, and more particularly to improvement of a binder backing.

[0002]

2. Description of the Related Art Conventionally, a binder binding device 1 as shown in FIG. 8 has been used. The binder binding device 1 is curved at a portion of the spine cover 3 as shown, and is similarly curved as shown by a broken line for inserting a rivet 5 therein and giving strength to the spine cover 3. The back metal fitting 7 is embedded. However, the rivet 5 is attached to the back metal fitting 7 by simply inserting the rivet 5 into the hole 9 as shown in FIG.
It easily slips out of the body, so workability is poor. Further, since the rivet head is still protruding above the surface of the backing metal fitting 7, as shown by numeral 11 in FIG. 8, the portion of the spine cover 3 corresponding to the rivet head is raised, thereby damaging the appearance. It has the drawback of being confused.

[0003]

PROBLEM TO BE SOLVED BY THE INVENTION Provided is an improved backing metal fitting for a binder binding device which improves workability when attaching a rivet to the backing metal fitting and does not cause the above-mentioned appearance problem and a method of processing the same. It is to be.

[0004]

According to the present invention, a back metal fitting for use in a state where it is embedded in the spine of a binder binding, and a fixing means for fixing the binder binding to the back metal fitting. In the combination with the rivet, the back metal fitting has a rivet insertion hole, and the rivet insertion direction is formed so as to form a recessed portion formed around the rivet insertion hole for accommodating the head of the rivet. And a peripheral wall of the rivet insertion hole bites into a peripheral portion of the rivet, whereby the rivet is firmly fixed to the improved backing metal fitting. An improved backing bracket is provided.

Further, according to the present invention, there is provided a method for processing an improved back metal fitting having a rivet insertion hole, which is used in a state where it is embedded in the cover of a binder binding device, comprising: a) inserting the rivet into the back metal fitting. Preparing a die for forming a hole, the lower die including a lower die having a recess capable of partially pushing the periphery of the rivet insertion hole when the rivet insertion hole is opened, and b) using the die. Opening the rivet insertion hole in the backing metal fitting and at the same time partially tapering the periphery in the same first direction as the rivet insertion direction; and c) inserting the rivet insertion hole in the first direction. At the step of inserting a rivet having a head, and d) placing the back seat metal fitting into which the rivet has been inserted on a crimping die having a recessed portion corresponding to the periphery of the rivet, and then rivet the back seat metal fitting. By crimping the rivet and forcibly biasing the tapered portion around the rivet insertion hole with respect to the rivet shaft portion and locking it there, at the same time making the backing metal fitting recessed in the recessed portion of the crimping die. And a step of accommodating a rivet head in the recess, the method for processing the improved backing metal fitting is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The improved backing metal fitting and its processing method of the present invention will be described in detail below with reference to FIGS. As shown in FIG. 1, the improved backing metal fitting 10 of the present invention has a raised portion 14 in which the periphery of the rivet hole 12 is partially tapered.
have. The raised portion 14 includes a back metal fitting and an upper mold 16
And placed in a cutting die 20 constituted by the lower die 18,
When the rivet hole 12 is opened in the backing fitting by the punching die 20, the periphery of the rivet hole 12 is partially pushed into the inside of the recess 22 formed in the lower die 18. The inner diameter of the rivet hole 12 is
It is set to be slightly smaller than the outer diameter of the rivet shaft portion 26 of the rivet 24 as shown in FIG. 2 so that the edge of the rivet hole 12 loosely contacts the outer surface of the rivet shaft portion 26 when the rivet is inserted therein. It

Next, the rivet 24 is inserted into the backing metal fitting 10 having the rivet hole 12 opened as described above. Due to the above-described relationship between the inner diameter of the rivet hole 12 and the outer diameter of the rivet 24, the rivet 24 is in the insertion position. It will be temporarily fixed. As a result, the risk of the rivet 24 coming off the back metal fitting 10 during the subsequent work of handling the back metal fitting is reduced.

The backing metal fitting 10 to which the rivet 24 is temporarily fixed in this way is then arranged on the lower mold 30 of the crimping mold 32 constituted by the upper mold 28 and the lower mold 30 as shown by the phantom line in FIG. To be done. The lower die 30 is formed with a recess 34 similar to the die 20 described with respect to the opening of the rivet holes. As shown in FIG. 4, when the rivet is crimped to the backing metal fitting, the raised portion 14 around the rivet hole 12 abuts the bottom surface of the recess 34, and the edge of the recess 34 is formed by the rivet shaft portion 26. While biting into the rivet head 36
Of the rivet head 36 is forcedly biased toward the back side of the rivet head 36 in the direction indicated by the arrow a, while the part within the peripheral portion 38 of the rivet head 36 is indicated by the arrow b in the figure.
It is pushed down in the direction so that its depth is adjusted so as to form a recess 40 in which the rivet head 36 is just received, as shown.

FIG. 5 illustrates a state in which the backing metal fitting 10 processed by the method of the present invention is embedded in the spine cover 44 of the binder 42. As is clear from this figure, the rivet 24 does not press the spine cover from the inside because the rivet head 36 is housed in the recess 40 as described above, and therefore, after long-term use of the binder binding device 40. Note also that the spine cover 44 is not partially raised outwards.

6 and 7 illustrate another aspect of the present invention. Here, the backing metal fitting 110 has a rivet insertion hole 112 having an inner diameter that is partially larger than the outer diameter of the rivet shaft portion 126 of the rivet 124.
Two ridges 114 taper toward the rivet shaft portion 126 are formed on the ridge. As shown in FIG. 7, in this embodiment, each raised piece 114 is not biased toward the backside of the rivet head during rivet crimping, but simply engages the shank 126 of the rivet 124 and thereby the rivet 124. It is only temporarily fixed to the inserted state.

【The invention's effect】

1. Improves workability with rivets attached to the backing bracket. 2. The appearance of the binder when it is embedded in the spine of the binder is improved.

[Brief description of drawings]

FIG. 1 is an exploded partial sectional view illustrating an improved backing metal fitting according to the present invention and a method for processing the same.

FIG. 2 is a partial cross-sectional view illustrating a state in which a rivet is inserted through the improved backing metal fitting shown in FIG.

FIG. 3 shows the improved backing metal fitting in the state shown in FIG.
It is a fragmentary sectional view showing the state arranged on a crimping die for rivet crimping with an imaginary line.

FIG. 4 is a cross-sectional view illustrating a biased state of each portion during processing with a crimping die.

FIG. 5 is a partial cross-sectional view illustrating a state in which the improved backing metal fitting according to the present invention is embedded in the spine cover of the binder binding device.

FIG. 6 is a plan view illustrating another embodiment of the improved backing metal fitting of the present invention.

7 is a partial cross-sectional view of FIG. 6 taken along line AA.

FIG. 8 is a partial side view of a binder binding device using a conventional backing metal fitting.

FIG. 9 is an exploded cross-sectional view illustrating a processing state of a conventional backing metal fitting when crimping a rivet.

[Explanation of symbols]

 10: Improved back metal fitting 12: Rivet hole 14: Raised part 16: Upper mold 18: Lower mold 20: Punching mold 24: Rivets 26: Rivet shaft part 32: Crimping mold 34: Recess 36: Riveting head 40: Recess 42 : Binder binding 44: Back cover

Claims (2)

[Claims] 1. A combination of a backing metal fitting for use in a state where it is embedded in the spine of a binder binding and a rivet for fixing the binder binding to the backing metal fitting, The back metal fitting has a rivet insertion hole, and is partially raised in the rivet insertion direction so as to form a recessed portion formed in a peripheral portion of the rivet insertion hole to accommodate the head of the rivet. The improved backing metal fitting characterized in that the peripheral wall of the insertion hole bites into the peripheral portion of the rivet, whereby the rivet is firmly fixed to the improved backing metal fitting. 2. A method for processing an improved backing metal fitting having a rivet insertion hole, which is used in a state of being embedded inside the cover of a binder binding, comprising: a) opening a rivet insertion hole in the backing metal fitting. And preparing the die including a lower die having a recess capable of partially pushing the periphery of the rivet insertion hole when the rivet insertion hole is opened, b) At the same time as opening the rivet insertion hole, partially tapering the periphery in the same first direction as the rivet insertion direction; and c) having a head in the rivet insertion hole in the first direction. Inserting the rivet, and d) placing the rivet-inserted backing metal fitting on a crimping mold having a recessed portion in which a portion corresponding to the rivet periphery is recessed, crimping the rivet to the backing metal fitting, and The tapered portion around the bet insertion hole is forcibly biased with respect to the rivet shaft portion and locked there, and at the same time, the lining head metal fitting is recessed in the crimp type recessed portion, so that the rivet head is A method of processing the improved backing metal fitting, including the step of storing in the recessed portion.