JP2008002651A - Fastener holder and connection fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an approximately U-shaped fastener connector with a number of holding pieces bent and formed on a band-shaped back plate for preventing the bending (bulging) of the back plate. <P>SOLUTION: This fastener holder has a fold line composed of a sectionally V-shaped inner and outer notches 13, 14 and formed at a joint portion of a flat band sheet 11 between the back plate 2 and each holding piece 3. There are only one inner notch 13 and the pair of outer notches 14 arranged on both sides across the inner notch 13. During bending, a wide range between the pair of outer notches 14 is involved in plastic deformation, thus preventing the generation of residual stress in a corner. As a result, the fastener secures smooth feed when loaded in a power driver, while preventing the bending of the back plate 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fastener holder for holding a large number of bar-shaped fasteners with heads such as screws, for example, and a connected fastener comprising a plurality of fasteners attached to the fastener holder. .

  For example, in order to be able to drive a screw (screw) continuously with an electric or pneumatic power driver, a long and flexible plastic screw holder is attached in parallel with a large number of screws. Screws are used. Examples of the screw holder include those described in Patent Documents 1 and 2 and having a U-shaped cross section as shown in FIG.

  That is, this screw holding body 1 ′ is composed of a back plate 2 extending in a strip shape and a group of holding pieces 3 integrally connected to both longitudinal ends of the back plate 2. Is basically crossed at an angle of 90 degrees, and therefore, the screw holder 1 'as a whole has a substantially U-shape when viewed from the side (viewed from the longitudinal direction).

  A pair of holding pieces 3 are set, and each holding piece 3 is formed with a holding hole 7 into which a shaft 6 of a screw 4 having a head 5 is fitted. In a portion corresponding to the pair, a feed engagement hole 8 is formed to fit and remove the guide portion provided in the power driver to the feed member. The holding hole 7 is cut open toward the free end of the holding piece 3 (the cut open portion is indicated by reference numeral 7a).

  Adjacent holding pieces 3 are separated by slits 9 in order to allow the connecting screws to be coiled and to avoid buffering between the adjacent holding pieces 3. The tip of each holding piece 3 is cut into a tapered shape.

  The screw holder 1 ′ is generally made of a band sheet made of a resin such as polyethylene or polypropylene, and is manufactured by punching and bending it. That is, as shown in FIG. 4, the flat strip sheet 11 ′ is punched by a press machine, the holding piece 3 is divided, the holding hole 7 is processed, and the feeding engagement hole 8 is processed. An unfolded intermediate product is manufactured, and then each holding piece 3 in the intermediate product is bent along the fold line 12.

The crease 12 is formed by thinning the connecting portion between the back plate 2 and the holding piece 3. As a specific method for the crease 12, the crease 12 is generally bent as shown in FIG. A method of forming an inner notch 13 ′ having a V-shaped cross section at a portion that becomes an inner corner of the corner portion (the method of Patent Document 1) and an inner corner of the corner portion in a folded state as shown in FIG. A method of forming an inner notch 13 ′ and an outer notch 14 ′ having a V-shaped cross section in each of the portion and the outer peripheral portion has been adopted. On the other hand, Patent Document 2 discloses that only the outer notch 14 ′ is formed without forming the inner notch. Needless to say, the notches 13 'and 14' are formed in the entire length in the longitudinal direction of the belt sheet 11 '.
Japanese Utility Model Publication No. 51-128376 (microfilm) JP 2000-220617 A

  The holding piece 3 is bent by plastically deforming the portion of the crease 12 in the band sheet 11 ', but the resin band sheet 11' is easily returned and deformed unlike a metal plate (the spring back is large). It has the nature of

  That is, when the belt sheet 11 'is bent, a compressive stress is generated inside the corner portion 15 and a tensile stress is generated outside the corner portion 15, but the resin belt sheet 11' is elastically restored to compression and tension. Since the force (residual stress) is large, it tends to return to a flat state. For this reason, the back plate 2 and the holding piece 3 are open, and as a result, as shown in FIG. 5 (B) and FIG. 5 (E). As shown, the back plate 2 may be bent outward (curved) in a bowed state.

  If the back plate 2 is bent, there is a problem that the feed resistance increases when the back plate 2 is loaded in the guide portion of the power driver, or the connecting fastener is held by the guide portion and a feed failure occurs. In addition, when the back plate 2 is bent, the force of trying to return to the extended state by the rib effect of the back plate in the state where the connecting fastener is wound in a coil shape becomes strong, so when winding in a coil shape for packaging in packaging boxes. There are problems such as difficulty in handling and increased feed resistance when loaded into a drum-shaped magazine.

  When the inner notch 13 'and the outer notch 14' are formed as shown in FIG. 5C, the tensile stress at the outer peripheral portion of the corner portion 15 can be suppressed, so that it is better than the case of only the inner notch 13 '. However, if only one inner notch 13 'and one outer notch 14' are provided in parallel, compression and tension are concentrated in a very narrow area between the inner and outer notches 13 'and 14', and plastic deformation occurs. Therefore, it is not possible to prevent a large residual stress from being generated in the corner portion 15, and the phenomenon that the back plate 2 is bent as shown in FIGS. 5D and 5E cannot be prevented.

  Further, when only the outer notch 14 ′ is provided as in Patent Document 2, a large compressive stress is generated in the inner corner portion of the corner portion 15, so that the bending of the back plate 2 cannot be eliminated. In addition, if the depth of the notches 13 'and 14' is increased, plastic deformation is facilitated. However, since the thickness of the corner portion 15 is excessively thinned, the notch 13 'and 14' are easily broken in the processing step. Another problem arises that the stiffness of ′ is significantly reduced.

  This invention is made | formed in view of such a present condition, and makes it a subject to provide the fastener holding body which eliminated the bending of the backplate.

  The present invention is directed to a fastener holder that is manufactured by punching and bending using a flat belt sheet as a raw material, and the fastener holder extends in parallel with each other at both longitudinal edges of a strip-like elongated back plate. A large number of pairs of holding pieces are formed by bending. Therefore, the holding pieces are formed in a substantially U-shape as a whole, and each holding piece has a holding hole into which a shaft of a headed fastener is fitted. Is formed.

  In the invention of claim 1, the fold of the connecting portion between the back plate and the holding piece is an inner notch provided in a portion located inside the corner portion in the folded state, and the outer periphery of the corner portion in the folded state. The inner notch is formed with only one inner notch, while the outer notch is formed in plural on both sides of the inner notch, or the inner notch. There is only one on the opposite side of the notch and it is wide. In the present invention, the notch means a groove or a notch, and the cross-sectional shape is not limited. The term “wide” is used in the sense that the groove width of the notch is several times the depth (for example, three times or more).

  According to a second aspect of the present invention, in the first aspect, each of the inner and outer notches has a substantially V-shaped cross section before being bent. Furthermore, in the invention of claim 3, in the state of claim 1 or 2, the inner notch is closed and the outer notch is expanded by deformation after being bent. It is thinner than the part.

  The invention of the present application also includes a connecting fastener. As described in claim 4, the connecting fastener has a structure in which a large number of fasteners are attached to any one of the fastener holders described in claims 1-3. Yes.

  According to the present invention, since a plurality of outer notches are formed or the outer notches are formed in a wide shape, in forming the holding piece by bending, the range of plastic deformation becomes wider than before, so that it is flat. It is possible to prevent or prevent the stress to return from being left in the corner portion.

  As a result, it is possible to prevent the back plate from bending to the opposite side of the holding piece without incurring a reduction in the strength of the corner portion, thereby ensuring a smooth feed in the guide portion of the power driver, and in packaging boxes. When stored and transported, it can be easily wound in a coil shape, and when loaded in a cylindrical magazine, an increase in feed resistance can be prevented.

  The cross-sectional shape of the notch can be set arbitrarily, but if the inner and outer notches are formed in a substantially V shape as in claim 2, there is an advantage that it can be easily machined using a conventional cross-section chevron. is there.

  Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 and 2). Although this embodiment is applied to a screw holder, the basic configuration is the same as the conventional one (therefore, FIGS. 3 and 4 can also be grasped as an embodiment of the present invention). Will be omitted, and only the characteristic part will be described. Elements that are the same as those in the prior art or that have common uses are the same as those in FIGS.

(1). First embodiment (FIG. 1)
FIG. 1 shows a first embodiment. 1A is a partial side view in a state before bending, FIG. 1B is a partial side view in a bent state, and FIG. 1C is a side view of a connecting screw.

  In this embodiment, as a means for forming a crease line 12 (see FIG. 4) at the connecting portion between the back plate 2 and the holding piece 3, a corner portion 15 (FIG. 3, FIG. 5)), one inner notch 13 is formed in the portion located on the inner corner side, while the inner notch 13 is sandwiched in the portion that becomes the outer periphery (outer corner side) of the corner portion 15 in the folded state. Two outer notches 14 located on both sides are formed. Both notches 13 and 14 are formed in a V-shaped cross section.

  By the way, in the case of FIG. 5C as a conventional example, plastic deformation concentrates only in a small range sandwiched between the apexes (bottom surfaces) of the inner and outer notches 13 'and 14', and thus residual stress is generated. The elastic restoring force makes it easy to return and deform. On the other hand, in this embodiment, a wide range surrounded by the vertices 13a, 14a, and 14b of the three notches 13 and 14 is plastically deformed. Therefore, excessive compression stress and tensile stress are applied to the corner portion 15. As a result, the back plate 2 and the holding piece 3 are prevented from spreading and the bend of the back plate 2 can be prevented.

  Further, in the bent state, the outer periphery of the corner portion 15 extends in a substantially arc-shaped portion between the two outer notches 14, and therefore, when the corner portion 15 is bent, (B) is shown. Thus, the corner portion 15 is thinner than the other portions, and the thin state spreads in a range of about 90 degrees in the outer peripheral direction (in a fan-like state).

  The notches 13 and 14 may be formed by pressing (crushing) together with the punching of the holes 7 and 8, etc., or may be pushed open using a roller or using a cutter before or after the punching. And may be cut. Further, the inner and outer notches 13 and 14 can be processed simultaneously or separately. The depths of the notches 13 and 14 differ depending on the type of material, but in general, they may be about 1/10 to 3/10 of the thickness of the belt sheet 11.

(2). Other embodiment (FIG. 2)
FIG. 2 shows another embodiment. Among these, in 2nd Embodiment shown to (A), the outer notch 14 is formed in the cut shape. It is also possible to form the outer notch 14 directly opposite to the inner notch to form a total of three outer notches 14 (in this case, the depth of the intermediate outer notch 14 is made shallower than the others). Is also good.)

  In the third embodiment shown in FIG. 5B, the inner notch 13 is formed in a V-shaped cross section, and the two outer notches 14 are formed in a semicircular cross section. Moreover, in 4th Embodiment shown to (C), the inner notch 13 is formed in the cross-sectional V shape, and the two outer notches 14 are formed in the cross-sectional trapezoid shape.

  Furthermore, in the fifth embodiment shown in (D), when one trapezoidal notch 13, 14 is formed inside and outside, the inner notch 13 is formed in a shape whose bottom width is smaller than the depth, and the outer notch 14 Is formed in a wide shape having a bottom width several times the depth.

(3). Others The present invention can be embodied in various ways other than the above embodiment. For example, the notch can be formed in other shapes such as a U-shaped cross section. The usage is not limited to screw-type fasteners such as screws, but can also be used for drive-in fasteners such as nails and headed pins. Furthermore, the holding hole of the holding piece does not necessarily have to open outward, and for example, it is possible to allow the head of the fastener to be removed by forming a radially extending slit.

  The means for intermittently feeding the fastener holder is not limited to providing a feed engagement hole, and the fastener itself can be engaged with a sprocket or the like, or a feed engagement projection can be provided. Also good.

It is a figure which shows 1st Embodiment. It is a figure which shows other embodiment. It is a figure which shows the basic composition of a screw holder. It is a figure which shows a part of manufacturing process of a screw holding body. It is a figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw holder as an example of fastener holder 2 Back plate of screw holder 3 Screw holding body 4 Screw 6 Screw shaft 7 Holding hole 8 Feeding engagement hole 11 Band sheet 12 Fold 13 Inner notch 14 Outside notch

Claims (4)

It is manufactured by punching and bending using a flat belt sheet as a material,
A plurality of pairs of holding pieces extending in parallel with each other are formed on the both side edges of the strip-like elongated back plate by bending, so that the whole of the pair of holding pieces has a substantially U-shape. In the piece, a holding hole into which the shaft of the head fastener is fitted is formed.
Zipper holder,
An inner notch provided in a portion located inside the corner portion in a folded state, and an outer notch provided in a portion that becomes the outer periphery of the corner portion in a folded state; And only one inner notch is formed on both sides of the inner notch, or only one on the opposite side of the inner notch. Wide and formed,
Fastener holder. The inner and outer notches are substantially V-shaped in cross-section before being bent,
The screw fastener holder according to claim 1. In the state after bending, the inner notch is closed and the outer notch is deformed so as to spread along the outer periphery of the corner part. Therefore, in the state after bending, the corner part is thinner than the other parts. Has become,
The fastener holder according to claim 1 or 2. A plurality of fasteners are attached to any one of the fastener holders according to claims 1 to 3.
Connecting fastener.

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