JPS58196663A - Productin of storing case of magnetic tape cartridge - Google Patents

Abstract

PURPOSE:To increase the strength of a storing case of a magnetic tape cartridge and to improve the external esthetic appearance of the case, by using a die provided within a region formed by connecting a gate position having an intersection between a rotary bottom and a coupling plate with the tangent line of a through hole, and producing a rotary cover. CONSTITUTION:A gate J is set within a region 2 which is formed by connecting an intersection 23 between a rotary bottom 13, a coupling plate 14 and an end plate 16 and the tangent line of a through hole 15. Therefore the synthetic resin injected from the gate position M touches a slide pin K inserted for drilling the hole 15 and is branched to upward and downward parts. These upward and downward flows of resin join together at the downstream of the pin K to form a weldline from the intersection 23 through a ridge line 25. The line 25 corresponds to the position where the strength of the cover 3 is maximum. Therefore the weldline never cracks by an impact. In addition, a gate track L is covered by a side wall 7 of a case main body 2. As a result, the strength of a storing case is increased for a magnetic tape cartridge along with improvement of the external esthetic appearance of the case.

Description

[Detailed Description of the Invention] The present invention relates to a storage case for magnetic tape cartridges.
In particular, the present invention relates to a method of manufacturing the rotating lid.

FIG. 1 shows this storage case and the index cards and magnetic tape cartridges stored in it.The storage case 1 is composed of a case body 2 and a rotating lid 3 pivotally attached to the case body 2. The rotating lid body 3 is both molded from synthetic resin.

The case body 2Fi, with a trapezoidal fitting recess 4t on one side, is composed of a fixed bottom 5, a front wall 6 and a pair of opposing side walls 7. The front wall 6 and side wall 7 are integrally connected. A drive shaft insertion hole 9K for a magnetic tape cartridge 8, which will be described later, is provided at a predetermined location on the fixed bottom 5, and a projecting piece lO for inserting a drive shaft into a magnetic tape cartridge 8, which will be described later, is provided at a predetermined location on the opposite front side of the side walls 7, 7. Bottles 11,11 each project inwardly.

The rotating lid body 3 includes a lid part 12 that opens and closes the opening of the case body 2 formed by a front wall 6 and side walls 7.7, and the fitting recess 4.
a trapezoidal rotating bottom 13 that is fitted into the base and whose edge 13A joins the edge 5A of the fixed bottom 5; a connecting plate 14 that connects the lid 12 and the rotating bottom 13; An end plate 1 connected to both end faces and formed with a pair of through holes 15.1st at appropriate locations.
6.16. Bin 1 of case body 2
1.11 into the through hole 15.15 of the rotating lid 3, the rotating lid 3 is pivotally attached to the case body 2.

A pocket 17 is formed by the lid portion 12, the rotary bottom 13, the connecting plate 14, and the end plates 16, 16 of the rotary lid body 3.
The one-track section 19 of the index card 18 and the front part of the magnetic tape cartridge 8 are inserted into this pocket 17.

Index card 18Fi is made of relatively stiff paper, etc. 9 It is bent to almost the same shape as the outer shape of the rotary lid body 3, and the 0 is printed on it. There are 6 self-listed Gt. The magnetic tape cartridge 8 has a head insertion date 21 formed on the front surface of a pair of 7.-720 and 20, and a half 20.20 has an internal cutout so that an Fi magnetic data 22 can run.

An index card 1 is placed in the pocket 17 of the rotating body 3.
Insert the magnetic tape cartridge 8 through the magnetic tape cartridge 8, then rotate the rotary lid 3 toward the case body 2 around the bottle 11, and close the opening of the case body 2 with the lid 12. Projecting pieces 10, 10 provided on the main body 2 fit into the drive shaft insertion hole 9.9 of the magnetic tape cartridge 8. When the rotating lid 3 is closed, the edge 13A of the rotating bottom 13 joins the edge 5A of the fixed bottom 5, and the rotating bottom 13 connects to the fixed bottom 5.
and #t are designed to be flush.

The rotating lid body 3 was manufactured using gold m as shown in FIGS. 3 and 4.

3 and 4 show the arrangement of the molds, with FIG. 3 being a side view and FIG. 4 being a top view of FIG. 3'. 1 In Figs. 3 and 4, A, B, C, D, and E indicate the rotating lid body 3.
F is a slide core that molds the inner peripheral surface of the rotating lid 3, G is a fixed mold, B, C, D, E, I'J movement. Gold mA and slide core F
The rotating lid body 3 is formed in this space G.

H and J are the runner and gate for injecting the molten synthetic resin into this space G, K is the slide pin for forming the through hole 15, I is the remains of the Fi gate, and N is the gate position.

In other words, the outer circumferential surfaces of the lid part 12, rotating bottom 13, and end plates 16, 16 of the #I cover body 3 are fixed to the outer circumferential surface of the connecting plate 14 by the fixed molds B, D, E and the movable molds. - The inner peripheral surface of the rotating lid body 3 is molded by the slide core F using the foot mold C.

In such a structure, if molten synthetic resin is injected into the inner hole H and gate J as shown in FIGS. 3 and 4, the fixed metals BIB, C, D, E, movable mold M, and slide core Synthetic resin is injected into the FKIItt space G,
The rotary lid 3t shown in FIGS. 1 and 2 can be integrally molded. Furthermore, the fixed mold E for molding the end plates 16 and 16t is shown in FIG. In the slide bin
Because of the position of K, even if synthetic resin is injected, it will not be injected into the slide pin and into K, so the through hole] 5゜1
5 is molded.

In this way, in manufacturing the rotary lid body 3 of the past 7 years, the third
As shown in the figure and FIG. 4, the gate position 11s of game 1-J
t, it had good moldability and was located almost in the center of the connecting plate 14, which was easy to process with a mold.

For this purpose, the hexagonal distortion body 3 is molded with a gate L mark 9 remaining approximately in the center of the connecting plate 14 shown in the perspective view of FIG. 5, and this gate mark Ltj is molded with transparent synthetic resin. This is undesirable from a design point of view because it remains on the outer surface of the rotary lid 3. In particular, the connecting plate 14 of the rotary lid 3 is also used as a back cover for recording and playing back magnetic tape cartridges. Therefore, the aesthetic sense of the appearance of this gate ruin L4-1 will be spoiled.

The present invention aims to eliminate such conventional drawbacks, and its purpose is to manufacture the gate position S at the substantial inner surface VC of the rotary attached body, thereby improving the aesthetic sense. This is an attempt to obtain an IJ storage case (Improved Magnetic Tape Car).

In order to achieve the above-mentioned object, the present invention uses a mold in which the turn 1IIb turner body is provided in a region where the gate position fIt connects the intersection of the movable bottom and the connecting plate and the tangent line of the through hole. The weld line that occurs during manufacturing is formed along the ridgeline of the rotating bottom and the connecting plate.

Hereinafter, the manufacturing method of the rotating lid body 3 of the present invention will be explained using FIGS. 6 to 9. FIG. 6 is a top view and a mirror γ view of the metal used in the manufacturing method of the present invention. Figure gold I
A perspective view of the rotary lid body 3 manufactured by NK, Figure 8 is an enlarged perspective view of the main part of Figure 7, and Figure 8 is a side view of Figure 8.・In FIGS. 6 to 911, 23 is an intersection point where the rotating bottom 13 intersects with the connecting plate 14 and the end plate 16, 24 is a region connecting the intersection point 23 and the tangent of the through hole 15, and this region 24 is where the gate J is. This is the range in which it will be placed. 25tI'i The ridgeline of the rotating bottom 13 and the connecting plate 14, M is the gate position, and the explanations of other symbols are the same as in the conventional one.

The fourth metal bottle shown in FIG. 6 is different from the conventional one shown in FIG. 4 only in the position of the gate J.

In other words, in the conventional mold of Section 4, since #1 of the connecting plate 14 of the rotary lid body 3 at the gate position NFi of the gate J was located in the center, the #1 of the connecting plate 14 of the rotary lid body 3 Although gate marks were formed as shown in Figure 5, mold K of the present invention
If s=・, then the gate position fliMFi of gate J is the 6th
Place t1t on either one of the fixed molds or fixed metal molds E as indicated by the one dotted line in the figure, Fig. 7, 8th
At the point where the rotating lid body 3 is placed in the shaded area 24 in the figure,
This is a portion of the end plate 16 of.

In other words, the fixed amount in Figure 6! As shown in Figure 7, IID and E, K is placed in a slide bin in order to form the through hole 15t at the same time during the molding process, and this slide bin is filled with molten metal. What if 1 synthetic resin is injected from Ge) J? = creates a weld line by dividing and merging the flow of synthetic resin.

The situation will be explained using FIG. 9. In FIG. 9, it is assumed that the gate is provided in the Mt-region 24, and the through hole 1 is
5, as mentioned before, corresponds to the slide bottle K inserted for the stone to be drilled in the hole 15 in Figure 6, and the flow will be divided above and below the through hole 15 as shown by the arrows in the figure. . The divided synthetic resin flows merge downstream of the slide bin during the molding process to form a weld line along the ridgeline 25 from the intersection 23.

In other words, if the gate position M is provided in a region other than the area 24 in FIGS.
Since it is formed in a place other than 5, it is not a good trench.

The reason is that the weld line is sensitive to impact, and the impact value drops to below 50 - that of the area without the weld line.If you drop the magnetic tape cartridge storage case, the impact of the drop will cause cracks to form at the weld line. It is.

In addition, this Weldry product can be easily distinguished from scratches and streaks on the product due to its appearance, which may lead to consumers feeling suspicious of the product as a whole.

However, if the synthetic resin is injected from the gate position M in the region 24 as in the present invention, the weld line is formed along the ridge line 25 from the intersection 23 in FIGS. is the corner between the surface of the rotating bottom 13 and the surface of the connecting plate 14, which is the strongest position of the rotating lid body 3.

Therefore, even if the impact value due to the weld line is reduced by half, the weld line will not cause cracking.

In the case of the one in Figure 5, the gate remains are the rotating lid body 3.
However, in the case of the present invention, as shown in FIGS. 7 and 8, the gate marks are located on the outer surface of the rotating lid body 3, but in the holes 15 and 15. First body 201
1.11 is inserted and combined with the case body 2, it is covered by the side wall 7°7 of the case body 2 and has essentially moved to the inner surface, and the weld line is also formed in a less noticeable place. That will happen.

This increases the strength, and also increases the strength of the connecting plate 14.
Since there is no trace of the gate, it can also be used as the back cover of the case, further improving the aesthetic sense of the exterior. The intersection of the moving bottom and the connecting plate and the tangent to the through hole are −
It is manufactured using a Kertk mold in the connecting area, and the weld line that occurs during manufacturing is formed along the edge of the rotating bottom and connecting plate, making it a stone-like VC, making the magnetic tag cart lithography storage case strong. It can be made stronger and the aesthetic sense of appearance can be further improved.

[Brief explanation of the drawing]

- Figure 1 is a perspective view of storage case 1 and the index card and magnetic tape cartridge inserted into it, Figure 2 is a sectional view of the enclosing lid in the storage case, WtS diagram, Figure 4
The figure shows a conventional metal. Figure 3 is a vertical cross-sectional view,
The figure is a top view of the mold with the fixing lug 9 removed in Figure 3, Figure 5 is a perspective view of the surrounding lid manufactured by the mold tC of Figures 3 and 4, and Figures 6- #! FIG. 9 shows the mold of the present invention and the next moving lid manufactured by the mold. FIG. 6 is a top view of the mold of the present invention corresponding to FIG. 4, and FIG. Perspective view of a rotating lid made of 1llK gold, No. 8
The figure is an enlarged perspective view of the main part of Iris 7, Figure 9 is Figure 7,
This is a side view of the stone illustrating the weld line in Figure 8. A, B, C, D, E...Gold, F...
Slide core, G...Space, J...Gate, K...Slide bin, L...Gate trace, M...Gate position , 3... Rotating lid body, 13... Rotating bottom, 15... Through hole, 16... Connection plate, 23...・Intersection,
24... area, 25... ridgeline. 'r 1 Hollow t3 Figure 74 Draft procedure amendment (voluntary) Director General of the Special Survey Agency 1゜Indication of the case 1982 Patent Commissioner No. 78161 2 Title of invention Method for manufacturing magnetic tape cartridge storage case 8 Make amendments Relationship with the Ministry Case Patent Applicant Address: 1-88 Ushitora-chome, Ibaraki City, Osaka Prefecture 4. Subject of amendment 5, Contents of amendment Tl) 2 lines from the bottom of page 4 The description in the 8th line of Ayu on the 5th page is “...Book BSC, D and...
. . . By the slide core F" is changed to `` . Slide core that forms the surface, G is the same foot mold, remanufactured mold B5C5D
SK and slide core F. (2) Specification stripe 5th page 4th line, 6th line and 1st line
Correct the description “molding” on line 8 to “forming” 0 (3) Clear a=* 6th page mto line, 1111
The description "fixed mold" in the 1st to 12th lines, the 16th line, and the 20th line is corrected to "possible di) J41 is the mold." (4) The description of "movable mold" on page 6, line 11 and line 16 of Akira MJ Hina is corrected to "fixed mold." (5) Change the description “Different” on page 8, line 8 of the specification to “
(6) Correct the ``fixed mold'' on page 8, line 11 and line 15 of ``fixed mold'' to ``movable mold.''

Claims (1)

[Claims] A fitting recess is provided on one side of the fixed bottom, and a pair of opposing side walls and a front wall are respectively erected from the remaining three sides of the case body, and on the side opposite to the front wall of the side wall of the case body. The case body is pivoted and formed by a pair of side walls and a front wall.
- a lid part that opens and closes, a rotating bottom that fits into the fitting recess and whose edge is welded to the edge of the fixed bottom, a stone connecting plate that connects the lid part and the rotating bottom, and these lids. 7. A magnetic tape car equipped with a rotating lid consisting of an end plate connecting a rotating bottom and a connecting plate. The outer w surface of the rotary lid of the IJ Tsuji storage case is covered with gold, and a slide core is inserted into the inner circumferential surface of the case, and molten synthetic resin is injected through the gate into the space formed. , the rotary lid body is manufactured using a mold whose gate position is in a region connecting the intersection of the rotary bottom and the connecting plate and the tangent line of the through hole, and welds caused by synthetic resin generated during manufacturing are avoided. Method for manufacturing a magnetic tape cartridge storage case characterized in that the line is formed along the rotating bottom and the edge I [K of the connecting plate.