JPH0636951Y2 - cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cap in which an outer cylinder screwed to a container body is provided with an inner cylinder which is biased by a coil spring and closely adheres to the container body for sealing. .

(Prior Art) In a conventional cap of this type, the inner cylinder is biased by a coil spring of equal pitch. By the way, the spring force of the coil spring increases in proportion to the compression length, and in the case of a coil spring of equal pitch, it increases linearly as shown by the broken line in the graph of FIG. It took a considerable amount of force to screw the threads together. Therefore, when the container body is a makeup tool such as lipstick or manicure which is used especially by women, the work of screwing the screw part of the cap with the screw part of the container body has been difficult for women.

(Problems to be solved by the invention) Therefore, according to the present invention, the spring force of the coil spring is small in the process until the screw part of the cap and the screw part of the container body are screwed together, and a woman can easily handle it. Further, it is an object of the present invention to provide a cap having a required sealing property in which the inner cylinder is brought into close contact with the container body with a sufficient force when the screwing is completed.

(Means for Solving the Problems) The present invention is to provide an inner cylinder for sealing inside an outer cylinder having a threaded portion for screwing with a threaded portion of a container body on an inner surface of an opening end, and The cylinder is biased toward the opening end by a coil spring of unequal pitch having a dense part and a sparse part, and the container body is inserted into the outer cylinder and the inner cylinder is pressed to compress the coil spring. The above object is achieved by providing a cap characterized in that the dense parts of the coil spring are configured to be in close contact with each other in a state where the ends of the screw part and the ends of the screw part of the outer cylinder are screwed together. It is intended.

(Embodiment) The embodiment shown in FIGS. 1 and 2 will be described in detail below. The cap (1) is an outer cylinder (3) having a threaded portion (2) formed on the inner surface of the open end, and a collar (4) disposed inside the outer cylinder (3) and provided in the approximate center of the outer surface. And the top surface (5) of the outer cylinder (3)
A coil spring (6) of unequal pitch interposed between the flange (4) and the outer cylinder (3)
And a sealing inner cylinder (8) which is engaged with a convex portion (7) provided on the inner surface of the container and is prevented from coming off. The coil spring (6) of unequal pitches for urging the inner cylinder (8) has a dense part (9) with small pitch and a sparse part (10) with large pitch. On the other hand, the container body (11) has a brush (13) projecting from the tip of its tip shaft (12) to form a screw portion (14) on the outer surface of the tip shaft (12). When the tip of the container body (11) is inserted into the cap (1), the front part of the brush (13) and the screw part (14) of the tip shaft (12) enters the inside of the inner cylinder (8), Tapered surface of (12) (15)
Comes into contact with the opening edge (16) of the inner cylinder (8). Then, when the container body (11) is pushed further in and the end of the screw part (14) of the tip shaft (12) and the end of the screw part (2) of the cap (1) are screwed together for the first time, The coil springs (6) of unequal pitches are appropriately set so that the entire dense parts (9) are in close contact with each other.

(Operation) While pressing the sealing inner cylinder (8) in the inner direction to compress the coil springs (6) of unequal pitch, the container body (11) is pushed into the outer cylinder (3) and the outer cylinder (3) A coil of unequal pitch is formed in the process until the end of the threaded portion (2) on the open end side of 3) and the tip end of the threaded portion (14) of the front shaft (12) are screwed together for the first time. Since the dense part (9) of the spring (6) is not in close contact, the number of effective turns is large and the spring constant is kept small, and the subsequent process, that is, the screw part (2) of the outer cylinder (3) and the tip The state where the screw part (14) of the shaft (12) is completely screwed (second
(See the figure), since the dense parts (9) of the coil springs (6) of unequal pitch are in close contact with each other, the effective winding number is reduced and the spring constant is increased. Therefore, the spring force of the coil spring (6) of unequal pitch when the cap (1) and the container body (11) are fitted is changed as shown by the solid line in the graph of FIG. Therefore, if the sealing performance of the inner cap of the cap using a coil spring of equal pitch as in the conventional case, that is, the adhesion of the inner cap to the container body and the sealing performance of the inner cap of the present invention are set to be the same, FIG. As shown in the graph, the solid line showing the change of the spring force of the coil spring of the unequal pitch of the present invention is located below the broken line showing the change of the spring force of the coil spring of the conventional equal pitch. The position of a in the graph shows the state where the end of the screw part (2) of the outer cylinder (3) and the end of the screw part (14) of the front shaft (12) are screwed together for the first time, and the position of b Shows a state in which the screw portion (2) of the outer cylinder (3) and the screw portion (14) of the front shaft (12) are completely screwed together. Therefore, the coil of unequal pitch received during the work until the end of the screw part (14) of the container body (11) is screwed into the end of the screw part (2) of the outer cylinder (3) of the cap (1) The resistance of the spring (1) is extremely small compared to the conventional one. Incidentally, the subsequent process until the screw part (2) of the outer cylinder (3) and the screw part (14) of the front shaft (12) are completely screwed is the container body (11) or the cap (1).
The work is easy because the resistance due to the compression of the sparse part (10) of the coil spring (6) of unequal pitch is not directly received only by rotating.

(Effect of the Invention) As described above, the present invention biases the inner cylinder for sealing which is received during the process of screwing the end of the screw part of the cap outer cylinder and the end of the screw part of the container body. There is an effect that the resistance of the spring is reduced to facilitate the fitting work of the cap, and the sealing performance of the sealing inner cylinder in a state where the cap and the container body are completely screwed can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state before fitting to a container body,
FIG. 2 is a cross-sectional view showing a state in which the container body is fitted, and FIG. 3 is a graph showing a change in spring force during the process of fitting the cap and the container body of the embodiment of the present invention and the conventional example. (1) ... cap, (2) ... screw part, (3) ... outer cylinder, (4) ... collar, (5) ... top surface, (6) ... coil spring with unequal pitch, (7) …… Convex part, (8) …… Inner cylinder,
(9) …… Dense part, (10) …… Sparse part, (11) …… Container body, (12) …… Forehead, (13) …… Brush, (14) …… Screw part, (15) …… Tapered surface, (16) …… Opening edge of inner cylinder.

Claims (1)

[Scope of utility model registration request] 1. An inner cylinder for sealing is arranged inside an outer cylinder having a threaded portion for screwing with a threaded portion of a container body on an inner surface of an open end, and the inner cylinder for sealing has a dense portion and a sparse portion. The coil springs of unequal pitch are urged toward the open end, and the container body is inserted into the outer cylinder to press the inner cylinder and compress the coil spring. A cap, characterized in that the dense parts of the coil spring are in close contact with each other when the ends of the screw parts are screwed together.