JPS586833B2 - Lid fastening device for school bags, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention The present invention relates to an improvement in a lid fastening device for school bags and the like.

In other words, there are already known seed cap fastening devices that use the attractive force of a magnet, or those that use a combination of the magnetic attractive force and a latching device, but they are mainly used for school bags in particular. There are drawbacks such as children handling them roughly, and especially if the lid is poorly secured (locked), the lid will inevitably open unnaturally.

For example, in the case of Utility Model 11B50-11041, if an unnatural force is applied to the knob, it may rotate to the left or right and open the lid, and if a large force is applied to the entire device, the magnet will also move in its longitudinal direction. However, it has the disadvantage that it moves unnaturally in the direction of the longitudinal centerline, and since there is no fixing mechanism for the tip of the shaft rod, the shaft rod becomes loose, which naturally weakens the overall function.

The object of the present invention is to eliminate these drawbacks and to enable children to open and close the lid in a fun and complete manner.

(2) Structure of the invention The illustrated embodiment will be described in detail below.

1 is the school bag body, 2 is its lid plate, 3 is a fixed plate fixed to the bottom surface 4 of the main body 1, and a backpack band 6 is attached to both ends 5, 5.
, 6 are tightened.

The fixing plate 3 is formed by molding the following parts simultaneously using a magnetically permeable material such as a die-casting material.In other words, a fitting recess 8 is formed in the center by the left and right bulges 7, A horizontally elongated locking plate stabilizing convex portion 10 having a shaft rod hole 9 is provided at the center of the fixing plate 3, and a fixing groove 12 for the permanent magnet 11 and a fixing groove 12 for the permanent magnet 11 are provided on the lower surface of the fitting recess 8 on the inside of the fixing plate 3. A mounting boss 13 is provided, and a support boss 16 for the elastic body 15 is also provided.

Reference numeral 14 denotes a disc stopper provided adjacent to the lower surface of the fitting recess 8.

The permanent magnet 11 is fitted and fixed in the fixing groove 12, and the fixing boss 13 is used for fixing and reinforcement.

A music box disc 17 is fixed to the disc stopper 14, and an elastic body 15 is fixed to its support boss 16, respectively.

Note that the tip of the elastic body 15 is formed into a hook 23 shape.

On the other hand, a shaft rod 19 made of a non-magnetic material having a knob 18 at its upper end is rotatably inserted and supported in the shaft rod hole 9, and the shaft rod 19 has preliminary closing portions 20A, 20A' positive closing portions on its lower surface. 20B, 20
B' Opening lid part 20C, 20C' Closing lid cam groove 24C, 24σ
, 24D, 24D' are formed on the deformed end face cam consisting of opening cam grooves 24A, 24B, and keys 21,
21. A circular key body 22 having 21' and 21' is inserted and fixed so that it can be rotated simultaneously with the rotation of the shaft 19 by operating the knob 18.

In addition, the preliminary closing lid parts 20A and 20A' have a rotation angle of 30 degrees inside and outside, the regular closing lid parts 20B and 20B' have a rotation angle of 60 degrees and a total of 90 degrees inside and outside, and the opening lid parts 20C and 20C' have a rotation angle of 90 degrees. Divide the circular plane into four equal parts and form each at the target position.

Furthermore, the hook 23 of the elastic body 15 is made to face the cam groove of the end cam.

Reference numeral 25 denotes a cover made of a magnetically permeable material, which is in close contact with the permanent magnet 11 and has a space 26 between it and the end cam that is adapted to the vertical movement of the hook 23, and is fixed at the tip of the fixed boss 13.
The tip end of 9 is rotatably inserted into the steady rest hole 29.

Reference numeral 27 denotes a hanging plate attached to the lid plate 2, which is made of a magnetically conductive material, and has a fitting hole 28 on its vertical center line that is large enough to allow the above-mentioned knob 18 and the hanging plate stabilizing convex portion 10 to pass through. It is formed with a center.

Further, the width of the locking plate 27 is set so as to fit into the fitting recess 8, and the thickness is formed so as to fit with the locking plate stabilizing convex portion 10.

The grip portion 18 and the locking plate stabilizing convex portion 10 have similar shapes and have the same planar area.

(3) Functions and Effects of the Invention The present invention has the above configuration, and its functions and effects will be explained with reference to the drawings. As shown in Figures 3, 4, and 5, permanent magnets 11 is fitted into the fixing groove 12, and the fixing boss 13 prevents it from being displaced due to lateral movement.Furthermore, the close contact of the cover 25 prevents its vertical movement even if an unnatural force is applied. Since the permanent magnets 11 are fixed to the fixed bosses 13, even if any unnatural force is applied to the fixed plate 3, the permanent magnets 11 are always in a fixed position and fully perform their functions without being eccentric.

The fixing boss 13 not only fixes the permanent magnet 11 but also completely fixes the cover 25.

The cover 25 also has the effect of protecting each mechanism.

The circular key body 22 fixed to the shaft 19 has its lower end surface shaped like a cam, and is constructed so that a circular plane of 360° is divided into four equal parts, and the target positions thereof function to close and open the lid, respectively.

That is, the parts that perform the lid-closing action are the preliminary lid-closing part 20A, zoA.
' and a positive closing lid part 20B, 20B', 20C, 2
0σ is the opening portion.

24A, 24B are opening cam grooves, 24C, 24C'24D
, 24D' are lid opening cam grooves.

(Accordingly, the structure is such that each time the end cam 20 (circular key body 22) rotates 90°, the lid is completely closed and the lid is opened.

) The rotation angle of the preliminary closing lid parts 20A, 20A' is around 30 degrees, and the rotation angle of the regular closing lid parts 20B, 20B' is 60 degrees.
Before and after is best.

That is, when rotating the shaft 19 with the knob 18, 90
Even if you don't rotate it, any child will be able to close the lid (lock) by rotating it around 30 degrees.

Conventionally, in this type of device, the spring action does not work in the fully closed state unless the lid is rotated completely 90 degrees, so there is always a risk of the lid opening, and if an unnatural force is applied to the grip or the entire device, the spring will not work. Although there has always been a risk of the lid being closed, this risk is avoided in the present invention.

FIG. 5 shows a state in which the lid is completely opened, and as shown in FIGS. When placed in a position parallel to the stop plate stabilizing convex portion 10, the circular key body 22 rotates at the same time, and the hook 23 of the elastic body 15 slides up the opening lid portion 20C or 20σ of the cam to open the lid opening cam groove 24A or 24B. In such a case, the circular key body 22 is completely prevented from rotating in the opposite direction by the interaction between the lid opening cam groove 24A or 24B, the elasticity of the elastic body 150, and the hook 23.

Next, when the circular key body 22 is rotated back and forth by about 30 degrees with the knob 18, the hook 23 slides up the preliminary closing portion 20A or 20A' and enters the closing cam 4C or 24c to preliminarily close the lid.

In this case, the elastic body 150, the hook 23 and the closing cam groove 24
C or 24C' interaction prevents the circular key body 22 from rotating in the opposite direction.

When the circular key body 22 is further rotated back and forth by approximately 60 degrees, the hook 23 slides up the normal closing lid part 20B or 20B' and enters the closing cam groove 24D or 24, as shown in FIG. It becomes perpendicular to the matching hole 28 and is completely closed.

Of course, the same effect as described above prevents the circular key body 22 from rotating in the opposite direction.

Next, when opening the lid, rotate the knob 18 90 degrees and the hook 2 will open.
3 slides up the opening part 20C or 20σ and opens the opening cam groove 24B.
22 or 24A.
Reverse rotation of is prevented.

The actions of the deformed end cam, the elastic body 15, and the hook 23 are as described above, and this action is repeated to perform preliminary closing, normal closing, and opening of the lid. The key 21 acts on the tone plate 17 to emit a pleasant sound, and the key 21' similarly acts on the tone disk 17 to emit a pleasant sound when the normal closing lid is rotated.

That is, keys 21 and 21' are symmetrically formed on the side surface of the circular key body 22 at positions that match the rotation angle and rotation distance of the circular key body 22 during preliminary closing and normal lid operation, that is, the sliding distance of the hook 23. If the child listens to the fun sound of the music box and remembers that the lid can be closed completely after making two sounds, there is no need to visually confirm that the lid is completely closed.

Even if the knob 18 is not completely rotated by 90 degrees, the hook 23 always enters the closing cam groove 24C or 24C', so there is no need to open the lid.

Furthermore, because the circular key body 22 does not rotate in the opposite direction due to the action of the cam groove and the hook, damage to the tone plate, which is susceptible to reverse rotation, can be completely prevented.

Further, in the present invention, a shaft rod 19 made of a non-magnetic material having a knob 18 at the upper end is inserted and supported in a shaft hole 9 provided at the center of the stabilizing convex portion 10 of the locking plate, and a swing rod 19 is provided in the cover 25. Stopper hole 2
9, and the cover is fixed with four fixed bosses, the horizontal swing of the shaft rod 19 is completely prevented. The fitting hole 28 is large enough to pass through the stabilizing convex part 10 of the city plate, and is provided so that its center point coincides with the center point of the stabilizing convex part 10 of the hanging plate. Through the operation of fitting into the portion 10, the locking plate 27 can be accurately adsorbed to the central fitting recess 8 of the fixing plate 3 without any deviation in the front, back, left, or right direction. 21 is prevented from shifting from side to side.

Furthermore, as described above, since the lower surface of the fixed plate 3 is covered with the cover 25 which is in close contact with the permanent magnet 11 and fixed to the fixing boss 13, it is easy to handle the internal mechanisms before fixing the fixed plate 3 to a school bag or the like. Protect and permanent magnet 11
In combination with the effect of the magnet fixing groove 12 and the magnet fixing boss 13, the prevention of bias is completely achieved.

[Brief explanation of the drawing]

The drawings show examples, and Figure 1 is a plan view of the fixed plate;
Figure 2 is a plan view showing the lid open state, Figure 3 is A- in Figure 2.
4 is a sectional view taken along the line B-B of FIG. 2, FIG. 5 is a bottom view with the cover removed and shows the open state, and FIG. 6 A is a sectional view taken along line A.
is a side view of the music disc, B is a side view of the elastic body, C is a front view showing the relationship between the deformed end cam and the elastic body when the lid is opened, D is an enlarged plan view of C, E is a plan view of the hanging plate, Fig. 7 is a plan view showing the lid closed state, and Fig. 8 is a diagram showing the unfolded action of the deformed end cam. FIG. 9 is a perspective view of a school bag equipped with the device of the present invention.

Claims (1)

[Claims] 1. On the inside surface of the fixing plate that is fixed to the main body of the school bag, etc.
In addition to providing a permanent magnet fixing groove and a fixing boss, a sound plate stopper and an elastic support boss are provided, and the permanent magnet is fixed in the fixing groove, while the outer surface has left and right bulges in the center of the fixing plate. The part forms a fitting recess for the hanging plate, and the central part thereof is provided with a horizontally elongated hanging plate stabilizing convex part having a shaft rod hole whose center is the same.
A shaft rod made of a non-magnetic material having a knob at the upper end is rotatably inserted into the shaft hole, and the shaft rod has a pre-closing section on the lower surface,
It is formed into a modified end face cam consisting of a normal closing lid part, an opening part, a closing cam groove, and an opening cam groove, and has a key at an appropriate position on the side surface, and an oval key body is inserted and fixed therein, and a hook is attached to the support boss. The above-mentioned hook is placed in the cam groove of the deformed end cam, and the elastic body is supported and fixed, while the tone disk is fixed so as to act on the key, and these mechanisms are tightly attached to the permanent magnet and fixed to the fixed boss. The lower end of the rod is inserted and fixed, and there is a space below the end face cam that accommodates the vertical movement of the elastic hook, and the tip of the shaft rod is covered with a cover made of a magnetically conductive material that is rotatably inserted through it. The hanging plate made of a magnetically conductive material that is attached to the lid plate has a fitting hole large enough to pass through the above-mentioned knob and the stabilizing convex part of the hanging plate, and its center point is set on the hanging plate. A lid fastening device for a school bag, etc., characterized in that it is provided so as to be aligned with the vertical center line.