JPH07272936A - Tubular core holder - Google Patents

Abstract

PURPOSE:To avoid damaging core-locking protrusions formed in a synthetic resin-made holder, thereby reducing the material cost and improving the working efficiency. CONSTITUTION:A holder is composed of a pair of box-like cases to house a pair of semi-tubular cores 3. A semicircular window 8 exists at a central opening of the side wall 6 of the case 11, facing at the core end face. A protrusion 9 corresponding to a coupling recess 5 of the core 3 exists at the inner wall of the lowest part of the window. Cuts 12 reaching the bottom of the case are formed into both sides of the protrusion 9, so that the protrusion 9 is formed at the free end of a thin and erected square rod 13, thus increasing the degree of freedom of the protrusion 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a resin holder for installing a signal line through a split type cylindrical core.

[0002]

2. Description of the Related Art A conventional example of a tubular core holder is shown in FIG. 2 together with a split type tubular core.

The holder has a shape in which a pair of box-shaped containers 1 are connected by a hinge 2 at the edges of the opening surface. Box-shaped container 1
This is a shape in which the core 3 obtained by splitting the tubular core into two equal parts can be housed with the split surface facing the opening surface. One (the left side in the figure) box-shaped container 1 is shown with the core 3 housed therein. Core 3
Is an octagonal outer peripheral tube equally divided along the axis, and has a groove-shaped engaging recess 5 in the center of both ends of a groove 4 having a semicircular cross section.

The box-shaped container 1 comprises a side wall 6 and a peripheral wall 7 corresponding to the end surface of the core 3. The semicircular window portion 8 of the side wall 6 corresponds to the groove 4 having a semicircular cross section of the core 3. The inner dimension between both sidewalls is almost the same as the outer dimension in the axial direction of the core 3. A projecting piece 9 for locking the core 3 is provided in the center of the inner surface of the side wall 6 close to the semi-circular window portion 8 so as to correspond to the engaging recess 5 of the core 3.
By thinning the inner wall surfaces of the side walls on both sides of the projecting piece 9 toward the bottom 18 of the box-shaped container with a narrow width, thin portions 19 are formed on both sides of the projecting piece 9. The bottom portion 18 is provided with a pair of cantilevered spring pieces 10 (only one of which is shown) formed by a U-shaped cut. The free end of the spring piece 10 slightly protrudes inward of the box-shaped container 1, and when the core 3 is housed in the box-shaped container 1, the split surface of the core 3 is slightly separated from the opening surface of the box-shaped container 1. Protrude (illustrated in container on the left). The projecting piece 9 is fitted into the engaging concave portion 5 of the core 3 either in contact with the bottom of the concave portion 5 or slightly apart from the bottom, and when the box-shaped container 1 is turned upside down. Prevents falling out of the box-shaped container 1.

[0005]

When the core 3 is housed in the box-shaped container 1 having the conventional structure, first, the tip of the projecting piece 9 is brought into contact with the end surface of the core 3, and then the core 3 is boxed. The protruding piece 9 was pressed against the bottom portion 18 of the shaped container 1 and slid on the end surface of the core to engage with the engaging recessed portion 5. Due to the elasticity of the thin portions 19 of the side walls 6 on both sides of the projecting piece 9, the projecting piece 9 opens slightly outward, and the inner dimension between the projecting pieces 9 expands to increase the core 3
The structure was such that it could be brought into contact with the end face of and could slide. Since the elasticity based on this thin portion is strong, the degree of freedom of the projecting piece 9 is small, and if the attitude of the core 3 or the way of pressing is bad, force is applied only to the projecting piece 9 and the projecting piece 9 may be chipped or broken. There was an occasion.

An object of the present invention is to prevent damage to the projecting piece provided on the box-shaped container of the cylindrical core holder.

[0007]

Means for Solving the Problems A notch reaching both sides of a core container provided on the inner surface of a side wall near a lowermost portion of a semi-circular window part on a side wall of a box container made of resin and reaching a bottom part of the box container. To provide. That is, according to the present invention, the core has a groove having a semicircular cross section in the central portion, and a pair of cores provided with engaging recesses at the central portions of both end edges of the groove are joined together in a tubular shape to hold the core. In a tubular core holder consisting of a pair of box-shaped containers provided with a semi-circular window portion corresponding to the groove of and a projecting piece that engages with the engaging recess of the core, on both sides of the projecting piece of the box-shaped container The cylindrical core holder is characterized in that a notch reaching the inner bottom is provided.

[0008]

The side wall portion between the cuts functions as an upright rectangular rod-shaped member having a protruding piece at the free end,
The degree of freedom of the protruding piece to the outside is increased, and the concentration of load on the protruding piece is eliminated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a pair of box-shaped containers 11 connected by a hinge 2 corresponds to an engaging recess 5 of a core 3 provided in the center of an inner surface of a side wall 6 close to a semi-circular window 8. A notch 12 that reaches the inner bottom of the box-shaped container 11 is formed on both sides of the protruding piece 9. Due to the notch 12, the side wall portion having the protruding piece 9 becomes independent from the other portions of the side wall 6. The side wall portion on which the projecting piece 9 is present has a thin upright rectangular bar shape, and the tip of this square bar 13 is the projecting piece 9.
As it faces inward of the box-shaped container.

When the core 3 is stored in the box-shaped container 11, even if the posture of the core 3 is bad, first, when the core 3 is slightly pushed down, the edge of the end face of the core 3 is inclined at the top of the projecting piece 9. The square bar 13 bends outward, the gap between the projecting pieces 9 on both side walls widens, and the projecting pieces 9 come into contact with the end surface of the core 3. The core is pressed until the projecting piece 9 fits into the engaging recess 5 of the core 3 to the state shown in the box-shaped container 11 on the left side of FIG. Since the rectangular bar 13 is bent and the projecting piece 9 elastically contacts the core 3 and freely moves, the pressing force is not concentrated only on the projecting piece 9 and the projecting piece 9 is not broken.

[0011]

According to the core holder of the present invention, the core can be stored more easily than before and the projecting piece is not damaged. Therefore, the waste of work and materials can be reduced, and the finished size of the core can be reduced. The effect that can alleviate is also produced.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention together with a core before use.

FIG. 2 is an external perspective view similar to FIG. 1 showing a conventional example.

[Explanation of symbols]

 1, 11 Box-shaped container 2 Crown 3 Core 4 Groove 5 Engagement recess 6 Side wall 7 Peripheral wall 8 Semi-circular window 9 Projecting piece 10 Spring piece 12 Notch 13 Square bar 18 Bottom 19 Thin section

Claims (1)

[Claims] 1. A core having a groove having a semicircular cross section at the center thereof, and a pair of cores having engaging recesses at the center of both end edges of the groove, which are joined together in a tubular shape to hold the core, and the core is provided on the side wall. In a tubular core holder consisting of a pair of box-shaped containers provided with a semi-circular window portion corresponding to the groove of and a projecting piece that engages with the engaging recess of the core, on both sides of the projecting piece of the box-shaped container A cylindrical core holder, characterized in that a notch reaching the inner bottom is provided.