JPH024451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of joining overlapping portions of binding hoops without the use of seals.

That is, step-like notches forming two protruding corners adjacent to each other in the length direction of the hoop are bored in the overlapping part of the binding hoop, and both the protruding corners are deformed in vertically opposite directions to form a vertically An object of the present invention is to relate to a no-seal joining method for joining both upper and lower hoops by biting the upper protruding corner of the lower hoop onto the lower protruding corner of the upper hoop by means of a tension acting on both hoops. The object of the present invention is to prevent the upper and lower hoops from coming undone even when a force is applied in the direction of deepening the overlapping margin of the hoop overlapping portions, that is, in the direction of loosening the connection of the joint portions.

An embodiment of the present invention will be described below with reference to the attached illustrative drawings. In FIG. It is a type. The movable mold 3 and the receiving mold 4 form incisions 6 and 7 shown in FIG. 2. The notches 6 and 7 are step-shaped with a bent middle part so as to form two protruding corners 8 and 9 adjacent to each other in the hoop length direction,
The protruding corner part 8 is deformed upward and the protruding corner part 9 is deformed downward, so that they are vertically inconsistent with each other. The amount of vertical deformation of both the projecting corner portions 8 and 9 is approximately equal to the thickness of the hoop overlapping portion 5. Moreover, both ends 6a and 6b of the notch 6 are parallel to the hoop length direction,
Only one end 7a of the notch 7 is parallel to the hoop length direction, and the other end 7b is inclined with respect to the hoop length direction as shown.

Once the step-like cuts 6 and 7 have been bored and the protruding corners 8 and 9 have been pressed as described above, the movable mold 3 is moved away from the receiving mold 4, but the binding hoop 1 is not covered. Overlapping part 5 by bundle 2
Since the tension acts in the direction of shallowing the overlapping margin of
The lower hoop 1b moves in the direction of the arrow 10b. Therefore, at each cut 6, 7,
The upper protruding corner 8b of the lower hoop 1b is the upper hoop 1
It bites into the lower protruding corner 9a of a. As a result, both the upper and lower hoops 1a, 1b are connected to each other.

On the other hand, as shown by arrows 11a and 11b in FIG. 6, a force was applied to both the upper and lower hoops 1a and 1b in the direction of deepening the overlapping margin of the overlapping portion 5, that is, in the opposite direction to loosen the bond between the two hoops 1a and 1b. in case of,
At the inclined end portion 7b of the notch 7, the inclined end surface 12a of the upper hoop 1a and the inclined end surface 12b of the lower hoop 1b come into contact with each other, thereby preventing loosening of the bond between the two hoops 1a and 1b.

In the illustrated embodiment, the notches 6 used in the conventional joining method and the notches 7 according to the present invention are used in combination, but only the necessary number of the notches 7 according to the present invention may be provided. Further, although the notches are provided symmetrically near both sides of the hoop, the notches may be provided in a row in the center. In this case, it is desirable to alternately arrange lenses with different refraction directions.

Although the method of the present invention can be carried out as described above, when the upper and lower hoops 1a and 1b are joined by the cut 6 in which both ends 6a and 6b of the cut are parallel to the hoop length direction, the hoops overlap. If the hoop tension is applied in the direction of shallowing the overlapping margin of the hoop overlap portion 5, the joint portion will be strongly tightened and a sufficient bonding effect will be obtained. When a force acts on the hoop in the direction of loosening the connection between the hoops, the force does not prevent the relative movement of the upper and lower hoops in the overlapping portion 5 at all. However, according to the method of the present invention, a force is applied to the hoop in the direction of loosening the bond by using the cut 7 in which one end 7b of the cut ends 7a and 7b is inclined with respect to the hoop length direction. The structure is designed to prevent the relative movement of the hoops stacked above and below due to the force exerted by the binding hoops, so the joints of the binding hoops will not loosen no matter how much force is applied to the items to be bundled. This made it possible to achieve high-quality binding without using seals.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view showing the state during binding, FIG.
The figure is a plan view of the hoop overlapping part in a state where the connection is completed by the hoop tension, FIG. 4 is a sectional view taken along the line A-A in FIG. 3, and FIG.
6 is a rear perspective view of FIG. 5. FIG. 1... Binding hoop, 3... Movable mold, 4... Receiving mold, 5... Hoop overlapping portion, 6, 7... Stepped notch, 8, 9... Extruding corner portion.

Claims (1)

[Claims] 1. In the overlapping part of the binding hoop, step-like cuts are made to form two protruding corners adjacent to each other in the length direction of the hoop, and both the protruding corners are deformed in vertically opposite directions to form both upper and lower ends. In the no-seal joining method, in which both the upper and lower hoops are joined by biting the upper protruding corner of the lower hoop onto the lower protruding corner of the upper hoop by means of a tension acting on the hoop, the inner part of both ends of the stepped notch is , one is formed parallel to the hoop length direction to allow the hoop tension to dig into both the upper and lower projecting corners, and
The other is a no-seal binding method for binding hoops, which is characterized by tilting the hoops in the longitudinal direction to prevent both upper and lower hoops from moving in opposite directions.