JPH0356263Y2 - - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) This invention relates to a protective cap that has an inner cylinder fixed to the container and a rotatable outer cylinder to protect the injection head of an aerosol injection container when not in use. The purpose is to simplify the production of such a double-barreled protective cap and to provide a means by which protection of the injection head can be reliably achieved when using the injection container.

The inventor developed an aerosol injection head with a double-tube protective cap that has an inner tube that is fixed to the container and an outer tube that can be rotated, and has filed several utility model registration applications, including Utility Model Application No. 17437-1983. Needless to say, it is best to manufacture these inner and outer cylinders by molding elastic plastic, but the inner cylinder requires a fixing device to attach to the container, and the outer cylinder must be used when not in use or when not in use. I don't want it to fall off the inner tube, so
A breakaway prevention device is required.

A conventional example of such an aerosol injection head with a protective cap is shown in FIG. 7, in which the hem edge of the inner cylinder designated by reference numeral 14 is the above-described locking fixture. That is, the shoulder surface of the injection container 4 and the mountain cap 31
By press-fitting the hem edge 14 having hooks 12 between the edges 32 of the inner cylinder 1, the inner cylinder 1 is fixedly fixed to the injection container 4. In Figure 7, the hem edge 1
4 is shown already press-fitted between the edge 32 of the mountain cap and the shoulder surface of the container 4, the hook 12 appears sharp at first glance, but its shape before press-fitting is similar to that of the hem edge 14 in FIG. Similarly, the top surface of the hook 12 is tapered, and its protrusion in the radial direction is 0.2 to 0.3 mm, corresponding to the thickness of the material of the mountain cap 31, 0.3 mm. On the other hand, the detachment prevention device described above includes a convex ring 15 formed on the outer peripheral surface of the inner cylinder 1 and an annular groove 2 recessed in the inner peripheral surface of the outer cylinder 2.
It consists of 8. Of course, instead of such a convex ring 15 and annular groove 28, although not shown, the inner cylinder 1
An annular groove may be formed on the outer cylinder 2, and a convex ring may be formed on the outer cylinder 2.

Since the hem edge 14 of the inner cylinder is unsupported by its own elasticity between the edge 32 of the mountain cap and the shoulder surface of the container 4, the protruding length of the hook 12 is 0.2 to 0.3.
Although there is no risk of the inner cylinder 1 falling off even if it is as small as mm, the molding error in the ring diameters of the convex ring 15 and the ring groove 28 that constitute the above-mentioned detachment prevention device is quite large, and the outer cylinder 2 is manually rotated, so the height of the convex ring 15 and the depth of the ring groove 28 must be considerably large, for example, 0.5 to 1 mm.
There is a danger that the outer cylinder 2 will fall off, especially during use.

Thus, since it is necessary to form uneven parts on the inner and outer circumferential surfaces of the inner cylinder 1, a split mold must be used for molding. In other words, if there are small irregularities on only one of the inner and outer circumferential surfaces, it is possible to perform molding by removing the mold for the smooth circumferential surface and then pulling out the other mold using what is called a burr removal process. If there are irregularities on both the inner and outer circumferential surfaces, it is impossible to remove the excess from both the inner and outer molds at the same time, so a split mold must be used. Accordingly, deburring and precision grinding are required for split molding, which inevitably increases the number of work steps significantly, which has been a significant hindrance in the production of aerosol injection containers, which should be mass-produced at low cost. This invention eliminates the above-mentioned obstacles in the mass production of protective caps made of double tubes, and also provides an excellent means that does not have the drawback of the outer tube falling off during use. This invention will be explained by an example.

(Structure of the invention) In FIGS. 1, 2, 5, and 6, reference numeral 1 denotes an inner cylinder made of elastic plastic, and has a cylinder diameter that allows the injection head to be accommodated. According to the illustration, the injection head consists of a push button with a nozzle 51 which is mounted on the valve stem 41 of the injection container 4. As shown in the figure, this inner cylinder 1 has a first window hole 11 for passage of the propellant, and a latch 12 for engaging with the edge 32 of the mountain cap 31 is attached to the upper inner periphery of the hem edge 14. It is installed protrudingly. 2 is an outer cylinder made of elastic plastic similar to the inner cylinder 1, and like the inner cylinder 1, a second window hole 21 for passage of the propellant is bored in the cylinder wall, and it can rotate with respect to the inner cylinder 1. It is fitted externally. The hook 13 and the arc-shaped hook receiving hole 23 constitute a detachment prevention device that makes it difficult for the outer cylinder 2 to come off from the inner cylinder 1. The hook 13 is integrally molded so that it can be inserted upward from the top end of the inner cylinder 1. On the other hand, the claw receiving hole 23 is an annular shelf 22 that protrudes from the inner periphery of the outer cylinder 2 by integral molding.
It is worn by. The arc length of the claw receiving hole 23 is the outer cylinder 1.
is determined according to the range of rotation. That is,
In Figures 1 and 2, the second window hole 21 of the outer cylinder is located in the inner cylinder 1.
Although the first window hole 11 is depicted as being in a non-overlapping position, if the outer cylinder 2 is rotated in the direction of the arrow in FIG. 2, the second window hole 21 will become the first window hole. 11
It will be understood that a position is reached where polymerization occurs. The claw receiving hole 23 is bored with an arc length corresponding to the rotation range of the outer cylinder 2.

This invention is made as described above, and the inner cylinder 1 is made of plastic and the edge 3 of the mountain cap 31 is made of plastic.
2 is provided on the inner periphery for engagement and fixation, and a first window hole 11 for passage of the projectile is bored in the cylinder wall.The position of the first window hole 11 is shown in FIG. , as shown in Figure 2, position it according to the injection direction of the injection head,
The hem edge 14 is pushed between the edge 32 of the mountain cap and the shoulder surface of the injection container 4 and fixed. In the embodiment, a shallow notch 33 is provided in the mountain cap 31.
are provided to facilitate this alignment and to ensure securement to the edge 32 of the mountain cap, but are not essential.

Next, the outer cylinder 2 is fitted into the inner cylinder 1. Inner cylinder 1
A detachment mechanism that prevents detachment of the outer cylinder 2 by a hook 13 that extends upward from the top end of the outer cylinder 2 by integral molding, and an arcuate claw receiving hole 23 bored in an annular shelf 22 that extends from the inner periphery of the outer cylinder 2 by integral molding. Since a preventive device is formed, the key pawl 13 is inserted into the pawl receiving hole 2 during the above-mentioned fitting.
3, the outer cylinder 2 can be rotated, but can be fitted in such a way that it cannot be easily removed.

Since the outer cylinder 2 has a second window hole 21 for passing the propellant similar to the first window hole 11, the outer cylinder 2 can be rotated to open the first window hole 11 and the second window hole 21. window hole 21
Injection can be performed by polymerizing and operating the injection head. When the injection container is not used, rotate the outer cylinder 2 in the opposite direction and close the second window hole 21 to the first one.
When the injection head is placed in a position where it does not overlap with the window hole 11, the cylinder wall in front of the injection head is closed.

Regarding the embodiment shown in FIGS. 1 and 2, since the tip of the claw 13 is formed quite long, the hole width at one end of the claw receiving hole 23 is made large as shown in the figure, This makes it easy to insert the hook 13 or remove the hook 13 as required. A small protrusion 24 provided on the inner edge of the claw receiving hole 23
When the outer cylinder 2 is rotated for injection and the second window hole 21 is overlapped with the first window hole 11, the small protrusion 24 presses the hook 13 and passes over the outer cylinder 2, temporarily closing the outer cylinder 2. It is designed to be fixed. Further, according to the embodiment, a slightly soft pusher cover 25 is fitted to cover the top surface of the outer cylinder 2, and a pusher plate 26 hangs down from the lower surface of the pusher cover 25. On the other hand, a deep groove 52 is formed on the top surface of the push button 5 of the injection head. Figures 1 and 2 show the injection container not in use.
The second window hole 21 is shown in a non-polymerized position. In such an unused state, even if the push plate 26 is lowered by pressing the push cover 25, the push plate 26 does not engage with the push button 5 because of the groove 52, and therefore, injection is prevented. The tube 2 is rotated in the direction of the arrow in FIG. 2 to open the first window hole 11 and the second window hole 21.
It will be understood that at the position where the windows overlap, the pushbutton 5 is pressed through the push plate 26 by the pressure of the pusher cover 25, and the projectile is ejected from the overlapped aperture. Note that the small protrusion 27 provided on the inner peripheral surface of the outer cylinder 2 fits into a recess provided in a part of the periphery of the pusher cover 25 to facilitate indexing of the corner position of the pusher plate 26. .

Effects of the invention This invention is as described above, and after the injection container is used, the outer cylinder 2 is rotated and the first window hole 11 and the second window hole 21 are placed in a non-overlapping position, so that the injection can be performed. It protects the head, and when in use, the outer cylinder 2 is rotated in the opposite direction so that the windows overlap, thereby opening the passage for the ejected material and making it possible to spray, as well as removing the outer cylinder 2. The preventive tool is the above-mentioned hook 13.
and a pawl receiving hole 23, by setting the length of the pawl of the key pawl 13 as necessary, even if the rotation operation of the outer cylinder 2 is rough, the dimensions of the inner cylinder 1 and the outer cylinder 2 can be adjusted. Even if there is some error in the outer cylinder 2
It can eliminate the accident of accidental falling off,
The purpose of protecting the jet head can be definitely achieved. In addition, according to this invention, the only protrusion that needs to be provided on the inner circumferential surface of both the inner cylinder 1 and the outer cylinder 2 is the hook 12 that can be used to remove the excess from the mold during molding. Since there is no need to provide any unevenness on the circumferential surface, everything can be manufactured by cutting molding, and there is no need for split molding.

Thus, according to this invention, the purpose of protecting the aerosol jet head using the double tube as described above can be definitely achieved, and at the same time, the production of such a protective cap can be simplified, making it inexpensive and easy to use. This greatly contributes to the provision of a widely used aerosol injection device.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of this device attached to an injection container, Fig. 2 is a plan view with the lid removed, and Fig. 3 is an example of the embodiment shown in Figs. 1 and 2. FIG. 4 is a partially omitted longitudinal cross-sectional view of the outer cylinder, FIG. 5 is a partially omitted longitudinal cross-sectional view of the inner cylinder of the embodiment shown in FIGS. 1 and 2, FIG.
The same figure is a half-cut plan view of the inner cylinder, and FIG. 7 is a longitudinal cross-sectional view of a conventional example of a protective cap attached to an injection container. 1 is the inner cylinder, 11 is the first window hole, 12 is the hook, 1
3 is a hook, 14 is a hem edge, 15 is a convex ring, 2 is an outer cylinder, 21 is a second window hole, 22 is an annular shelf, 23 is a claw receiving hole, 24 and 27 are small protrusions, and 25 is a pusher. Lid, 26 is a push plate, 28 is an annular groove, 31 is a mountain cap,
32 is an edge, 33 is a notch, 4 is an injection container, 41
is the valve stem, 5 is the push button, 51 is the nozzle,
52 is a concave groove.

Claims (1)

[Scope of utility model registration request] The cylinder has a diameter that can accommodate the jet head, a first window hole 11 for passage of the jet is bored in the cylinder wall, and a hook 12 for engaging and fixing the end edge 32 of the mountain cap 31 is provided at the hem. A second inner cylinder 1 made of elastic plastic protrudes from the inner periphery of the upper part of the edge 14 for passage of the propellant.
An outer cylinder 2 made of elastic plastic with a window hole 21 bored in the cylinder wall is rotatably fitted onto the outside, and a device is provided to prevent the outer cylinder 2 from separating from the inner cylinder 1.
In the protective cap that can be sprayed at a position where the first and second window holes 21 are overlapped, the detachment prevention device includes a hook 13 that is integrally molded and extends upward from the top end of the inner cylinder 1, and a hook 13 that is integrally molded and extends upward from the top end of the inner cylinder 1. An annular shelf 22 protruding from the inner periphery of the cylinder 2 is bored corresponding to the rotation range of the outer cylinder 2 from the overlapping position of the first window hole 11 and the second window hole 21 to their non-overlapping position. A protective cap for an aerosol injection tube consisting of an arc-shaped claw receiving hole 23.