JP3219985B2 - Synthetic resin shaped material having screw holes and connecting device for synthetic resin shaped material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin shape used for a frame such as a sash window frame, a sash shoji or a large forehead, in particular, a material having a screw hole and a synthetic resin having a screw hole. The present invention relates to a connecting device for a profile.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing an example in which a screw hole 21 formed in a conventional synthetic resin shape member 20 is formed in a lower frame of a sash window frame. As shown in the figure, a conventional screw hole 21 has a projection 22 at the center of each side of a rectangle.
And has a substantially rectangular cross-sectional shape.

[0003] As shown in FIG.
In the case where the profile 20 having the shape 1 is connected to the other profile 30 at right angles to the connection, the end face of the profile 20 abuts at right angles to the wall 31 of the profile 30, and the screw penetration provided on the wall 31 is provided. The tapping screw 40 is screwed into the screw hole 21 of the profile 20 while strongly pressing the screw from the hole 32.

At this time, as shown in FIG. 7, the tapping screws 40 are provided at respective convex portions of the screw holes 21 in four axially continuous linear regions of the outer peripheral surface of the male screw portion. 22 is pressed and screwed into this while turning the female thread.

[0005]

However, the screw hole 21 having a substantially rectangular cross section has the following problems.
That is, first, since the cross-sectional shape of the screw hole is a complicated shape having four projections, the number of manufacturing steps of the die for extruding the profile is extremely large, and therefore, the die manufacturing cost is high. Become.

Second, since the cross-sectional shape of the screw hole is complicated, when the resin material is extruded by the mold, the flow of the resin material is likely to be swirled. As a result, the shape of the screw hole after molding is completely as designed. The shape is not stable because it does not become a rectangular shape and is distorted into a parallelogram.

Therefore, as shown in FIG. 5, when connecting a profile 20 having two or more screw holes 21 to a profile 30, two holes corresponding to the screw holes are formed in a wall 31 of the profile 30. After screwing a tapping screw (hereinafter simply referred to as a screw) from one screw through hole into one screw hole, another screw from the other screw through hole is screwed into the other screw hole. However, when the shape of the previous screw hole is distorted, the center of the screw and the center of the screw through hole do not match, so the screw to be screwed is difficult to enter the center of the screw hole, and screwing work of the screw If the screw is forcibly screwed in, the periphery of the screw through hole will be destroyed, or the amount of thread cut for each convex portion 22 of the screw hole will be uneven, and the screw will not be easily screwed. Incomplete bond strength with screw hole Or becomes, a variety of problems, such as had occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has improved the shape stability of a screw hole at the time of extruding a profile and the assembling accuracy of a frame made of the profile, and has a screw screwing operation. It is a first object of the present invention to provide a shape of a screw hole in which a screw can be easily formed and connection strength of a shape member by the screw is increased. It is a second object of the present invention to provide a connection device that can securely and firmly connect the synthetic resin shaped material having the screw holes.

[0009]

In order to achieve the first object, a synthetic resin profile according to the present invention is characterized in that the cross section of the hollow portion of the screw hole is substantially triangular.

In order to achieve the second object, the connecting device according to the present invention comprises a synthetic resin shaped member having a screw hole having a hollow portion having a substantially triangular cross section, and a male screw having an outer diameter of the screw. A screw having a diameter larger than the diameter of a circle inscribed on the three sides of the triangle of the hole and having a common center with the inscribed circle and smaller than the diameter of a circle passing from the center to the nearest vertex of the triangle. It is characterized by becoming.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an end view of an example of a profile, and FIG. 2 is an end view of another example of a profile. INDUSTRIAL APPLICABILITY The present invention can be applied to various synthetic resin profiles used for the framework, such as sash window frames, sash shojis, and large foreheads.

FIG. 1 shows an example in which two screw holes BH according to the present invention are formed in a profile 1 used for a lower frame of a sash window frame. FIG. 2 shows an example in which a screw hole BH according to the present invention is formed in a shape member 2 used for a lower frame of a sash shoji.

The screw hole BH of the synthetic resin material according to the present invention
Has a substantially triangular cross section. Most preferably, the triangle is an equilateral triangle. But,
It may be an isosceles triangle or another triangle. Since the cross-sectional shape is a relatively simple triangle, the shape stability during and after molding of the resin material is high. Further, it is effective that each vertex of the triangle has a rounded shape as in the illustrated example, in order to enhance the fluidity of the resin material at the time of molding and further enhance the shape stability.

FIG. 3 is an explanatory view for explaining the relationship between the size of the screw hole and the diameter of the male screw portion of the screw, and FIG.
It is sectional drawing which shows the state which screw 3 was screwed in H.

A profile 1 having a screw hole BH having the above shape
As shown in FIG. 3, the screw 3 used to abut the second member 2 at right angles to another shape member to connect it to the other member has an outer diameter of the male screw portion S inscribed on three sides of a triangle on the inner surface of the screw hole BH. It is larger than the diameter of the circle IC, has a common center with the inscribed circle, and has a vertex closest to the center of the triangle (if the screw hole is a regular triangle, all vertices are equidistant from the center). Is smaller than the diameter of the circle OC passing through the given circle.

When the condition of the outer diameter of the screw is set as described above, when screwing the screw 3 into the screw hole BH, the screw 3 shown in FIGS.
As shown in (1), the outer peripheral portion of the external thread portion of the screw is pressed against and touches the central portion of the three sides of the triangle of the screw hole, and the screw is threaded there and the screw is advanced.

If the screw hole is a regular triangle,
The outer peripheral portion of the screw is pressed against the central portion of each side of the triangle with an equal force. Therefore, the screw advances straight along the center line of the screw, that is, without shifting in any direction, when given a pressing rotational force from the driver. Accordingly, there is no relative movement between the connected profile members, so that the assembly accuracy is improved.

The contact position of the screw with the screw hole is as follows:
Since there are three points in the outer circumferential direction, which are smaller than those in the related art, there is little frictional resistance, and since a particularly large force is not required for the screwing work, the work is easy and the fatigue is small.

Further, when the outer diameter condition of the screw is set as described above, when the male screw portion of the screw is screwed into the screw hole, as shown in FIGS. A gap G is formed in the portion at intervals in the outer circumferential direction of the screw. If this gap is present, the cutting chips (cutting chips) of the synthetic resin material generated when the screw is screwed are accommodated in the gap, so that the cutting chips do not become an obstacle to the screwing of the screw afterwards. Therefore, the screwing work of the screw can be performed lightly from the beginning to the end.

[0020]

As described above, according to the profile of the present invention, since the screw holes are triangular, the shape stability of the screw holes at the time of molding or after molding is extremely high. Further, the screw screwed into the screw hole easily and uniformly hits the three sides of the screw hole, and the familiarity between the screw and the resin material of the shape material is improved. Therefore, the screws easily enter the screw holes, and the assembling accuracy of the frame is significantly improved. In addition, since the screw is not forcibly screwed in, the screw through hole of the shape member to be connected is not cracked or the screw hole is partially broken. further,
Since the screw and the inner surface of the screw hole are in three-point contact, the frictional resistance against the rotation of the screw is small, so that the screwing operation can be easily performed.

According to the profile connecting device of the present invention,
At the time of screwing in the screw, the outer circumference of the male screw portion proceeds while cutting the resin material reliably and at an appropriate force at three points, and the cutting waste is stored in the gap at the apex of the screw hole. Can be performed lightly from the beginning to the end.

[Brief description of the drawings]

FIG. 1 is an end view of an example of a profile.

FIG. 2 is an end view of another example of a profile.

FIG. 3 is an explanatory diagram illustrating a relationship between the size of a screw hole and the diameter of a male screw portion of a tapping screw.

FIG. 4 is a sectional view showing a state in which a tapping screw 3 is screwed into the screw hole BH.

FIG. 5 is an end view showing screw holes of a conventional synthetic resin material.

FIG. 6 is a cross-sectional view showing an example of a connection structure of a synthetic resin material.

FIG. 7 is a sectional view showing a state in which a tapping screw is screwed into a screw hole.

[Explanation of symbols]

 1, 2 synthetic resin material 3 tapping screw BH screw hole G void

Claims (2)

(57) [Claims] 1. A synthetic resin shaped material characterized in that a cross section of a hollow portion of a screw hole is substantially triangular. 2. A synthetic resin shaped material having a screw hole having a substantially triangular cross section, and an outer diameter of a male screw portion is larger than a diameter of a circle inscribed in three sides of the triangle of the screw hole. And a tapping screw having a common center with the inscribed circle and having a diameter smaller than the diameter of a circle passing from the center to the nearest vertex of the triangle.