SCREW COUPLING STRIP USE IN A CONTINOUS SCREW TIGHTENING MACHINE
To present a screw coupling strip having a drill screw and a seal washer assembled in a screw holding belt, capable of tightening the screw by using an existing screw holding belt assembling only the drill screw and an existing continuous screw tightening machine, in which the screw holding belt has enough size and strength for allowing to pass the screw head part. A screw coupling strip 1 includes a screw holding belt 2 having intermittent feed notches 22 provided at specified pitches along the lateral edge of a belt main body 21 made of a belt-like body of synthetic resin, and having screw holding parts 23 provided at same pitches as the intermittent feed notches 22 in the longitudinal direction of the belt main body 21, a drill screw 3 having a screw shaft part 31 inserted in the screw holding parts 23, and having a screw head part 33 held passably in the screw holding parts 23, and a washer 4 assembled in the screw shaft part 31 inserted in the screw holding parts 23, in which the holding belt 2 is disposed between the screw head part 33 and the washer 4. FIG. 2.
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1. Field of the Invention
The present invention relates to a screw coupling strip assembled in a screw holding belt at a specified pitch and used in a continuous screw tightening machine, and more particularly to a screw coupling strip having a drill screw, and a seal washer (known as bonded washer) having a sealing member adhered to a metal washer, both assembled in a screw holding belt.
2. Background Art
Drill screws are often used for fixing a roofing material or an outer wall material made of a thin metal plate to a support member such as column or beam of steel structure such as steel house or metal building.
Such drill screws for outdoor applications are drill screws assembling a seal washer (known as bonded washer) having a sealing member of rubber or neoprene adhered to a metal washer, in order to prevent invasion of rainwater. Such drill screw with seal washer is known to include a screw coupling strip assembled in a screw holding belt made of synthetic resin at a specified pitch so that the screw may be tightened continuously by using a continuous screw tightening machine (see, for example, patent document 1 and patent document 2).
However, such conventional screw coupling strip is large in the diameter of the seal washer, and it is difficult to pass the seal washer from the screw holding belt in the screw tightening process by the continuous screw tightening machine, and especially in the process of drilling a metal plate by rotating the drill screw at high speed, various problems have been known such as frictional heat occurring between the seal washer and the screw holding belt to wear out the seal member of the seal washer, or thermal deformation of the screw holding belt made of resin to cause troubles in pitch feeding of the screw holding belt and pushing and passing of the seal washer. To eliminate such problems, it has been hitherto attempted to increase the width and thickness of the screw holding belt, use a belt of a reinforced structure, or employ a cassette type of larger rigidity, but the belt weight is increased, and the continuous tightening machine is increased in size and weight, and it is not suited to field works.
- Patent document 1: Japanese Patent Publication No. 2880703
- Patent document 2: Japanese Patent Application Laid-Open No. 2003-336614
The present invention is intended to solve the conventional problems, and it is hence an object thereof to present a screw coupling strip having a drill screw and a seal washer assembled in a screw holding belt, capable of tightening the screw by using an existing screw holding belt assembling only the drill screw and an existing continuous screw tightening machine, in which the screw holding belt has enough size and strength for allowing to pass the screw head part.
To achieve the object, the screw coupling strip used in a continuous screw tightening machine of the present invention includes a screw holding belt having intermittent feed notches provided at specified pitches along the lateral edge of a belt main body made of a belt-like body of synthetic resin, and having screw holding parts provided at same pitches as the intermittent feed notches in the longitudinal direction of the belt main body, a drill screw having a screw shaft part inserted in the screw holding parts, and having a screw head part held passably in the screw holding parts, and a washer assembled in the screw shaft part inserted in the screw holding parts, in which the holding belt is disposed between the screw head part and the washer.
When using an existing continuous screw tightening machine, an interval for allowing the screw coupling strip to pass through a belt guide part of the continuous screw tightening machine is provided between the downside of the screw holding belt and the washer. However, the washer may be assembled adjacently to the downside of the screw holding belt so far as there is no problem for passing the screw coupling strip into the belt guide part of the continuous screw tightening machine.
As explained herein, in the screw coupling strip of the present invention, only the drill screw is inserted and held in the screw holding part of the screw holding belt, and the washer itself is assembled in the screw shaft part of the drill screw at the downside of the screw holding belt, and therefore the drill screw is rotated at high speed by the continuous screw tightening machine provided with the screw holding belt, and a hole is drilled in a metal plate of a work member, and the screw tightening operation is started, and the screw head part passes by penetrating through the screw holding part, and the washer positioned at the downside of the screw holding belt is pressed and tightened to the metal plate by the screw head part. Therefore, the screw holding belt is enough to have size and strength for allowing easy passing of the screw head part, and by using the screw holding belt provided only with the existing drill screw, and the existing continuous screw tightening machine conforming to the existing screw holding belt, it is possible to tighten easily the drill screw having a washer of a large diameter.
The present invention is particularly applicable to a screw tightening strip having a seal washer (known as bonded washer) having a sealing member adhered to a metal washer assembled in a drill screw.
Referring now to the drawings, preferred embodiments of the present invention are specifically described below.
The screw holding belt 2 has intermittent feed notches 22 provided at specified pitches P along both lateral edges of a belt main body 21 made of a belt-like body of synthetic resin such as polypropylene or polyethylene, and has screw holding parts 23 provided at same pitches as the intermittent feed notches 22 in the longitudinal direction of the belt main body 21. The screw holding part 23 is formed of a short tubular part 24 for inserting and holding a screw shaft part 31 of the drill screw 3 and four support pieces 25 for supporting the tubular part 24, and the four support pieces 25 are disposed in an X-figure crossing 45 degrees to the axial line in the longitudinal direction of the belt main body 21, and are protruded to the downside of the belt main body 21 by forming a contour shape of a circular truncated cone, with the lower end parts coupled to the tubular part 24. At the adjacent position to each support piece 25 coupled to the tubular part 24, a breaking notch 26 for breaking the tubular part 24 easily is provided. The inside diameter of the tubular part 24 is slightly smaller than the outside diameter of the screw shaft part 31.
In the drill screw 3, the leading end of the screw shaft part 31 is consecutively provided with a drill part 32, and the rear end part has a screw head part 33 of a hexagonal head capable of withstanding a strong tightening torque.
The seal washer 4 has a seal member 42 of rubber or neoprene or the like adhered to a metal washer 41, and is also called a bonded washer, and has a high sealing performance. The diameter of a mounting hole 43 of the metal washer 41 is formed slightly larger than the outside diameter of the screw shaft part 31 of the drill screw 3, and the diameter of a mounting hole 44 of the seal member 42 is formed slightly smaller than the screw diameter of the screw shaft part 31, so that the seal washer 4 assembled in the screw shaft 31 is stopped and held by way of the seal member 42.
In the screw holding belt 2 having such configuration, the screw shaft part 31 of the drill screw 3 is inserted into the tubular part 24 of each screw holding part 23, until the screw head part 33 abuts against the upside of the belt main body 21, and then the drill screw 3 is assembled into the screw holding belt 2, and the seal washer 4 is assembled into the screw shaft par 31 inserted into the screw holding part 23, and is stopped and held by the screw shaft part 31 by the elastic restoring force of the seal member 42, so that the screw coupling strip 1 shown in
On the other hand, on the axial line of the drill screw 3 transferred to the screw tightening position A, a driver bit 60 movable back and forth in the axial direction is disposed by penetrating through the belt guide 50.
Claims
1. A screw coupling strip used in a continuous screw tightening machine comprising:
- a screw holding belt having intermittent feed notches provided at specified pitches along the lateral edge of a belt main body made of a belt-like body of synthetic resin, and having screw holding parts provided at the same pitches as the intermittent feed notches in the longitudinal direction of the belt main body,
- a drill screw having a screw shaft part inserted in the screw holding parts, and having a screw head part held passably in the screw holding parts, and
- a washer assembled in the screw shaft part inserted in the screw holding parts,
- wherein the holding belt is disposed between the screw head part and the washer.
2. The screw coupling strip used in a continuous screw tightening machine of claim 1, wherein an interval for allowing the screw coupling strip to pass through a belt guide part of the continuous screw tightening machine is provided between the downside of the screw holding belt and the washer.
3. The screw coupling strip used in a continuous screw tightening machine of claim 1, wherein the washer is a seal washer having a sealing member adhered to a metal washer.
4. The screw coupling strip used in a continuous screw tightening machine of claim 2, wherein the washer is a seal washer having a sealing member adhered to a metal washer.
Type: Application
Filed: Sep 1, 2009
Publication Date: Mar 4, 2010
Applicant:
Inventor: Kimio SHINJO (Osaka)
Application Number: 12/551,847
International Classification: B65D 85/24 (20060101);