JPH1054410A - Fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening tool effective principally for fastening a work of specific thickness to a thin metal base plate and secondarily for fastening the work to a wooden base plate. SOLUTION: This fastening tool consists of a lengthy shank 22, a head 24 formed on one of the ends of the shank 22, and a tip 28 formed on the other end of the shank 22. In this case, the shank 22 contains a grooved portion 40 including a spiral groove forming a spiral rib and a ring shape groove forming a ring. The ring shape groove has a minor diameter and the ring shape rib has a crest. The minor diameter of the ring shape groove forms a virtual cone expanding toward the tip and the crest of the ring forms a virtual cone converging toward the tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel fastener for fastening a work having a unique shape along a shank and mainly having a predetermined thickness to a thin metal base. This fastener may be used to fasten a workpiece to a wooden base.

[0002]

2. Description of the Related Art Various types of steel fasteners for fastening a relatively hot work such as a plywood or a plaster board to a metal frame member, a wooden frame member, or an underlay of a wooden floorboard are known. . Generally, such fasteners have a central axis and have an elongated shank that is axially driven by a powered tool, such as a pneumatic or combustion powered tool.

The Japanese Utility Model Publication No. 57-356 dated Aug. 6, 1982
No. 93 discloses a long shank, a head formed at one end of the shank, a tip formed at the other end of the shank, and a plurality of annular rings arranged along the shank. A fastener of this type is disclosed having an annular groove and a helical groove forming a helical rib along the shank. The annular groove has a valley that forms a virtual cylinder of a predetermined diameter. The annular groove has a ridge forming a virtual cylinder of larger diameter.

[0004] US Patent No. 4,718,802 discloses a tapered shank, a head formed at one end of the shank,
A tip formed at the other end of the shank, an annular groove forming a plurality of annular rings disposed along the shank, and a spiral groove forming a spiral rib along the shank. Such a fastener is disclosed. The annular groove has a valley that forms a virtual cone that converges toward the tip. The annular groove has a ridge that forms a virtual cone that converges toward the tip.

[0005] US Patent No. 5,489,179 discloses a long shank divided into a plurality of annular portions by one cylindrical land or a plurality of cylindrical lands, a head formed at one end of the shank, A tip formed at the other end of the shank, a plurality of annular grooves forming a ring along the annular portion, and a spiral groove forming a spiral rib along each of the annular portions. A fastener of this type is disclosed. The annular groove has a valley that forms a virtual cylinder of a predetermined diameter. The annular groove has a ridge forming a virtual cylinder of larger diameter.

US patent application Ser. No. 08 / 472,906 discloses an elongated shank, a head formed at one end of the shank, a tip formed at the other end of the shank, and along the shank. This type of fastener has a plurality of annular grooves forming a plurality of annular rings, and a spiral groove forming a spiral rib along the shank, and a polymer is applied to the shank. It has been disclosed. The annular groove has a valley that forms a virtual cylinder of a predetermined diameter. The annular groove has a ridge forming a virtual cylinder.

[0007]

There are problems in manufacturing this type of fastener. In other words, if the peak of the ring near the tip is slightly larger than the other peaks, the holding force of the fastener in the metal base is significantly reduced. It is very difficult to manufacture such a fastener with sufficient precision to eliminate this problem.

The present invention is an improvement of this type of fastener, which is effective mainly for fastening a work of a predetermined thickness to a thin metal base, and for fastening a work to a wooden base as a secondary part. Provide effective fasteners.

US Pat. No. 4,964,774 discloses a metal fastener for use on wooden structures. This fastener is mainly provided with a thermoplastic aliphatic polyurethane film. The nail provided with this coating is aligned and attached to a band-shaped member instead of a coil. This is because the coating crosslinks between the nails attached to the coil and the crosslinked portion cannot be separated when unwinding the coil.

Some pallet nails have a flexible acrylic coating. This nail has a film formed only on a part of the nail to alleviate the problem of crosslinking. Since the film is flexible, it can be separated when the nail is driven.

[0011]

SUMMARY OF THE INVENTION The present invention provides a steel fastener having an elongated shank, a head formed at one end of the shank, and a tip formed at the other end of the shank. The shank has a grooved portion having a spiral groove forming a spiral rib and an annular groove forming a ring portion. Between the groove and the tip in the shank,
In addition, a cylindrical portion can be provided between the groove and the head. The annular groove has a valley and the annular rib has a peak.

According to the present invention, the valley of the annular groove forms a virtual cone expanding toward the front end, and the peak of the ring portion forms a virtual cone converging toward the front end. . Thus, the fastener can be easily manufactured without the problems of the prior art described above. ADVANTAGE OF THE INVENTION The fastener of this invention has a predetermined thickness, but has the effect of fastening effectively to a metal base having a wall of a smaller thickness.

[0013] Preferably, one or more protective layers are provided on the outer surface of said shank to protect it from corrosion.
A polymer coating may be provided on the outer surface of the shank. Preferably, the polymer coating comprises an aqueous composition comprising an aqueous acrylic resin and an aqueous polyurethane resin. Alternatively, the polymer coating can be a powder coating applied as disclosed in US patent application Ser. No. 08 / 472,906.

Preferably, a zinc layer and a chromate conversion layer are provided between the polymer film and the outer surface of the shank. The polymer coating provides lubrication when the fastener is driven into a metal substrate. The zinc and chromate conversion layers and the polymer coating protect against corrosion after the fastener is driven. Other objects, features, and advantages of the present invention will become more apparent from the following description of the embodiments.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The building assembly shown in FIG. 1 comprises a relatively thick plate 10, a metal frame member 12, and a fastener 20 according to an embodiment of the present invention. Frame member 12
Has a relatively thin wall portion 14 and two perpendicular to the wall portion 14.
And two relatively thin flanges 16.

The fastener 20 has an elongated shank 22 having a central axis. The shank 22 has a head portion 24 formed at one end of the shank 22 and a tip portion 26 formed at the other end of the shank 22. The surface of the head 24 facing the shank 22 is chamfered. As shown, the tip 26 preferably has a generally frustoconical shape, except for a rounded tip 28.

The board 10 is a wooden, plywood, directional standard board or other wood material, cement board or plaster board. The frame member 12 can be formed from plated steel. Core is Rockwell C
Hardness is 40 to 45, surface is Rockwell C hardness is 42
From 50 to 50, and can be formed from a 1030 carbon steel cylindrical wire with one or more protective layers formed for corrosion resistance.

The fastener 20 is disclosed in US Pat. No. 4,964,774.
The coating is covered with a continuous inorganic coating consisting of a zinc layer 32 and a chromate conversion layer 34 and an organic coating consisting of a polymer coating 36 by a process similar to that disclosed in US Pat.
Zinc layer 32 and chromate conversion layer 34 are adapted from the zinc and chromate conversion layer disclosed in U.S. Pat. No. 4,964,774. U.S. Pat. No. 4,964,774 is hereby incorporated herein by reference.

Preferably, the polymer film 36 is formed from an aqueous composition containing an aqueous acrylic resin and an aqueous polyurethane resin. This aqueous composition is disclosed in US Pat.
It is applied to the fastener 30 by a process similar to the process disclosed in No. 4774. After drying, a thickness of about 0.0003 to 0.003 in, particularly preferably a thickness of about 0.0005i
A substantially continuous film wraps fastener 30 such that n. Preferably, the aqueous composition is provided by Finnaren & Hurley of Pennsylvania.
aley) and a defoamer such as F & H®. When applied to aligned tethers 20 or similar fasteners, the aqueous composition reduces unwanted cross-links between the aligned tethers, and also tightens the resulting cross-links. It is very weak so as not to affect the operation of the tool driving tool. In order to obtain the desired film characteristics, forced drying may be performed in a high temperature environment for 30 seconds.

A particularly preferred aqueous composition is Ne commercially available from Zeneca Resins of Massachusetts (formally ICI Resins).
oCryl A-550® aqueous acrylic dispersion as the major amount and NeoRez R-9637® aqueous aliphatic polyurethane dispersion as a minor amount. As an example, the aqueous composition may be essentially 3 quarts of NeoCry.
l A-550 aqueous acrylic dispersion and 4.75L (5quarts)
NeoRez R-9637 Aqueous aliphatic polyurethane dispersion and 1
Includes 13 quarts of tap water and 3.5 cc of F & H, 10 before applying to a fastener similar to fastener 30.
Mix for minutes.

The polyurethane component of the polymer coating 36 provides a lubricating effect when the fastener 20 is driven into a metal substrate, such as the wall 14 of the metal frame member 12. The acrylic component of the polymer coating 36 provides a hard surface, which does not at least partially flake when the fastener 20 is driven. Polyurethane and acrylic compositions provide a coating of the fastener that does not allow for cross-linking between the fasteners, but have sufficient strength to adhere to the fastener while the fastener is driven into wood or steel. While the fastener is driven
The coating forms a lubricating action to facilitate the driving and reduces the stress on the holes formed in the steel. The fastener 2 includes a zinc layer 32, a chromate conversion layer 34, and a polymer film 36.
Protected from corrosion even after 0 is implanted.

Alternatively, although less preferred from a cost standpoint, the polymer coating 36 may be a powder coating. If the polymer coating 36 is a powder coating, the powder coating is applied as disclosed in US application Ser. No. 08 / 472,906.

The shank 22 has a grooved portion 40. The grooved portion 40 is formed by a series of annular grooves 42 forming a series of annular rings 44 and a spiral groove 46 forming a spiral rib 48 on the outer periphery. Preferably, as shown, the spiral groove 46 is formed deeper than the annular groove 42. The shank 22 also has a cylindrical portion 50 formed between the grooved portion 40 and the head portion 24, and a cylindrical portion 52 formed between the grooved portion 40 and the tip portion 26. . A connecting wire (not shown) is suitably welded to the cylindrical portions 50, 52, and the fasteners 20 and other similar fasteners (not shown) are aligned and connected in a known manner to form a coil ( Not shown).

Each of the annular grooves 42 has a valley 5 at the deepest part.
Two. When the spiral groove 46 is deep, the annular groove 4
2 is divided by the spiral groove 46. In the axial profile, as shown in FIG. 4, the annular groove 46 is rounded at the valley 52 and the annular groove 46 is rounded at the peak 54.

As shown in FIG. 2, the valley 52 of the annular groove 42 is
It forms a virtual cone, that is, a virtual cone that expands toward the tip 26, converges toward the head 24, and forms an acute angle α with a straight line extending in the axial direction. As shown, the ring portion 44 expands toward a virtual cone, ie, the head 24, and
And forms a virtual cone that forms an acute angle β with a straight line extending in the axial direction. Preferably, the acute angle α is about 0.1 ° and the acute angle β is about 0.1 °.

An example of a method for manufacturing the fastener 20 will be described.
Wafilos is a cylindrical wire made of 1030 carbon steel.
s® nail processing machine to form a head 24 on the fastener 20 and a tip 26 having a rounded tip 28. Next, the fastener 20 is roll-max (Rol
An annular groove 42 forming a ring portion 44 and a spiral groove 46 forming a spiral rib 48 are formed by processing on a lmax® screw making machine. In one embodiment, the virtual cone is formed by a mold that forms the annular groove 44. A mold having a tapered surface may be used. After heat-treating the core to have a Rockwell C hardness of 40 to 45 and a surface of Rockwell C hardness of 42 to 50, the fastener 20 is provided with a zinc layer 32 and a chromate conversion layer 3.
4 are deposited successively. After heating, the connected fasteners 20 are immersed in the aqueous composition to form the polymer film 36, and then heated and dried.

As described above, the shank 22 has a unique shape, and the fastener 20 is easily manufacturable without the problems of the prior art. Fastener 20
Has an effect of effectively fastening a work having a predetermined thickness such as a relatively thick plate 10 to a metal base having a thin wall such as a metal frame member 12 having a relatively thin wall 14. A flange 60 is formed in the wall 14 where the tip 26 penetrates, and this tightly holds the grooved portion 40 of the fastener 20.

The fastener 20 mainly fastens a work having a predetermined thickness to a metal base having a thin wall. The fastener 20 may be used for fastening a work to a wooden base. Obviously, improvements, changes, and modifications may be made without departing from the spirit and scope of the invention.

[Brief description of the drawings]

1 is a cutaway perspective view of a building assembly comprising a relatively thick workpiece or plate, a metal base or thinner frame member having thinner walls, and a fastener according to an embodiment of the present invention. It is.

FIG. 2 is an enlarged view of the fastener of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is an enlarged view of a portion indicated by a chain line in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Plate 12 ... Frame member 14 ... Thin wall 16 ... Frame flange 20 ... Fastener 22 ... Shank 24 ... Head 26 ... Tip part 28 ... Tip 40 ... Grooved part 42 ... Annular groove 44 ... Ring part 46 ... Spiral Groove 48 ... spiral rib

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Elizabeth J. Eckman USA, Illinois, Chicago, West Tough Avenue 2846 (72) Inventor Lawrence S.E. Shelton United States of America, Illinois, Morton Glove, North Marmora 9223

Claims (11)

[Claims] 1. A steel fastener comprising a long shank, a head formed at one end of the shank, and a tip formed at the other end of the shank, wherein the shank includes a spiral rib. A virtual cone having a grooved portion having a helical groove to form and an annular groove to form a ring portion, wherein the annular groove has a valley, and the valley of the annular groove extends toward the tip; Wherein the ring portion has a peak, and the peak of the ring portion forms a virtual cone that converges toward the tip. 2. The fastener according to claim 1, wherein the spiral groove is deeper than the annular groove. 3. The fastener according to claim 1, wherein said shank has a cylindrical portion between said groove and said tip. 4. The fastener according to claim 1, wherein said shank has a cylindrical portion between said groove and said tip and between said groove and said head. 5. The fastener according to claim 4, wherein the spiral groove is deeper than the annular groove. 6. The fastener of claim 1, further comprising one or more protective layers on an outer surface of the shank to protect against corrosion. 7. The fastener according to claim 1, wherein a polymer coating is provided on an outer surface of the shank. 8. The fastener according to claim 7, wherein the polymer film comprises an aqueous composition containing an aqueous acrylic resin and an aqueous polyurethane resin. 9. The fastener according to claim 8, wherein a zinc layer and a chromate conversion layer are provided between the polymer film and an outer surface of the shank. 10. The fastener according to claim 7, wherein said polymer coating is a powder coating. 11. The fastener according to claim 10, wherein a zinc layer and a chromate conversion layer are provided between the polymer film and an outer surface of the shank.