JPS61217357A - Cap for vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to caps for containers, and has particular advantageous application for, but not limited to, types of containers, such as foodstuffs, for example due to vibrations and/or temperature changes. Relating to interchangeable screw caps that tend to loosen due to

In one aspect, the present invention provides a container cap comprising a top and a depending skirt, the inner surface of the skirt comprising an inner protrusion for threaded engagement with the container neck, each of the protrusions having a surface generally facing toward the top. The surface is provided with a front portion that extends circumferentially in the direction of rotation when the cap is installed and a rear portion that slopes toward the top.

Another aspect of the invention is a container cap comprising a top and a depending skirt, the inside surface of the skirt extending helically away from the top at a first helical angle and within a smaller helical corner. formed by a threaded ridge terminating in .

Preferably, the small helical angle is zero or approximately equal to zero.

The present invention also relates to a combination of a container and a cap therefor, wherein the container has a neck whose outer surface defines a mouth formed by a plurality of external threaded projections, each of which faces in a direction away from the mouth. a rear portion having a helical angle of zero when considered in the direction of rotation when the cap is installed, and a front portion inclined toward the mouth; The cap consists of a top portion and a depending skirt, the inner surface of the skirt is formed by an inner protrusion for threaded engagement with the container neck, and each of the inner protrusions is zero when considered according to the direction of rotation when the cap is installed. The present invention provides a front part having a helical angle of , and a rear part sloping toward the top.

The present invention further provides a container and molded plastic cap combination in which the outer surface of the container neck is formed from a plurality of ridges with circumferentially spaced multi-thread threads, each ridge remote from the top of the neck. The lower surface of the end of the cap has a substantially zero helical angle, and the cap is removably mounted on the neck of the closure and consists of a top and a depending skirt, the inner surface of which has a multi-thread thread corresponding to that of the container. formed by ridge lines on the cap each extending helically away from the top and terminating in a portion having a zero or near-zero helical angle, both portions forming a ridge line on the container that provides each ridge line on the container. The lower surface of the end portion is engaged so that the sealing surface of the cap enters into engagement with the cooperating surface of the container when the cap is screwed together.

From this point of view, the front surface of the threaded ridge line or the equivalent inner protrusion on the cap becomes a surface that engages with the threaded ridge line surface on the container or the outer protrusion on the container that is equivalent to it when the cap is installed, and The front surface of the outer protrusion on the cap becomes a ridgeline surface that engages with the front surface of the inner protrusion on the cap.One embodiment of the present invention will be described below with reference to the accompanying drawings.

Referring first to FIG. 3, the neck of a glass container of the known type is depicted with a triple thread screw for attaching a cap. Each thread has a ridgeline 10 having a horizontal top surface 11, an upper surface 12 inclined in a helical manner, and a lower surface of which a portion 13 thereof is inclined in a helical manner and a portion 14 thereof has a zero winding angle. It is composed of protrusions.

The surface portion 14 terminates in a circumferentially facing surface 15. With respect to the relative rotational movement of the cap and the container during application of the cap, the surface portion 13 constitutes the front face of the thread ridge and the surface 12 It forms the back of the ridge. Surface 12.1
3 are skewed at the same angle to the central axis of the container and can be considered parallel to each other for practical purposes. At the bottom of the ridge line is a rib 1 known as a transfer ring, which is used in a well-known method in the manufacture of glass containers.
There are 6.

1 and 2 show, to a different scale than in FIG. 3, a cap molded from elastic plastic material and designed for a container neck. The cap has a top 18 and a depending skirt 19. Immediately below the top, the skirt is provided with a recess 20 for receiving a sealing gasket held by integrally molded lugs 21 uniformly distributed around the recess.

The inner surface of the skirt is formed by three inner protrusions in the form of ridges 24 forming a triple thread. The top 25 of each threaded ridge is helical shaped, while the bottom end 26 of each ridge has a zero helix angle. The bottom part 26 is connected to the top part 25 by a smoothly curved transition part 27. The upper and lower surfaces of each ridgeline 24 constitute the front and rear surfaces of the ridgeline, respectively.

According to a desirable feature of the invention, the portion 26 with zero helical angle
The length is the circumferential dimension A between the front end of each ridge line 24 and the line 29 on the rear surface of the same ridge line 24, and the circumferential dimension A between the front end of each ridge line 24 and the line 29 on the rear surface of the same ridge line 24.
It is slightly larger than the circumferential dimension A between the following ridge line 100 and the parallel surface 12.

When the cap is screwed onto the container neck, its ridges 24 cooperate with those of the container to force the cap down into sealing engagement with the container. Since the dimension A of the cap is slightly larger than the dimensions B and J of the complementary part of the screw on the container neck, the two surfaces that make up dimension A are tightly fitted between the surfaces that make up dimension B, and the thread ridge line is slightly larger. A slight increase in hand force is required to generate a large elastic strain and thus rotate the cap. The post-curved (lower) surface 27b of the curved transition 27 allows the cap to fall sufficiently to force the upper surface of the portion 26 of the threaded ridge 24 into the correct position to engage the front surface of the ridge 10. There is no need to push the cap downwards, just rotate it. When the front surface 28 reaches the lower end of the surface 13, its threaded ridge portion 26 forms a helical portion 25 of the threaded ridge 13 on the cap.
Engage the surface portion 14 of the ridge on the container until the front surface of the curved transition portion 270 is in contact with the front surface 13 of the ridge 10 on the container up to the curved front surface 27a. This contact constitutes an effective stop for rotational tightening of the cap. However, in some cases, due to manufacturing tolerances, the front end 28
The helical portion 26 may be brought into engagement with the surface 13 after rotational tightening is stopped by bringing the helical portion 5 into contact.

The portion 26 is therefore in close or direct engagement with the surface portion 14 in the event of a movement such as an accidental unscrewing of the cap, for example by vibration. There is then no inherent tendency for the helical sloped surfaces to sag because they are not in contact with each other.

Depending on the shape of the container, the batting material 15 may be omitted.

When unscrewing the cap, the initial rotation is easy, but when the front end 28 and rear surface of the ridge line 24 are between the front and rear surfaces of the ridge line 10 on the container neck, the rotation force of the hand must be increased slightly. It is necessary to do so. As a result, the present arrangement provides a cap that has an inherent resistance to rotation that would loosen the seal even if vibration, temperature changes, or other factors cause the cap to rotate away from its "closed" end position. . The tendency to relax is a particular problem that arises in the case of multi-ply braids due to the helical angle used.

The axial distance between the lower surface of the sealing gasket and the lower surface of the bottom end 26 of the cap lip is between the neck tip and the container ridge 14.
The cap is slightly less than the axial spacing between the bottom surfaces of the container so that engagement between the zero helical portions of the container causes the cap to be pulled down to form a tight seal between the sealing gasket and the neck end. It is desirable to do so. Whenever the shape of the seal between the cap and the container is such that the respective surfaces abut axially on the two members, a similar device may be used to form a tighter seal. can.

Various alternative methods of retaining the sealing gasket within the cap may be used, and the cap may alternatively include a poured gasket, but may also include integrally molded annular sealing ribs, fins or surfaces to form a seal with the container neck. It will be appreciated that it can be configured to

The cap according to the invention can be used on containers with their contents at internal pressure or internal vacuum or atmospheric pressure and is equally suitable for containers made of plastic or metal.

If desired, the end 26 may be thickened axially downwardly to bring its underside into frictional contact with the upper flank of the transfer ring 16 to further resist accidental loosening of the cap. It can be done to create friction.

Instead of being smoothly curved, the transition section can have a constant helical angle intermediate between the upper ridge section 240 angle and zero angle. In the example of a cap with three threads 24, the portion 24 has 12 threads around the central axis of the cap.
with a helical angle of 120° 41' extending over 0°, the transition section extending 10'' around the central axis with a helical angle of 5D, and the non-helical portion 26 extending 120° 41' around the central axis; It extends over ″.

The shape of the thread ridges in the drawing structure is also beneficial in tightening the skirt against forces that tend to distort it. When the cap is tightened on the container, the angle of the flanks of the screw can create a camming action that tends to press the skirt radially outward in the ridge position and pull the skirt inwardly in the open ridge position. The relatively long ridges 25, 26 result in the skirt being reinforced against these deforming forces.

[Brief explanation of the drawing]

FIG. 1 is a half axial cross-sectional view of a cap according to the invention; FIG. 2 is a cross-sectional view taken along line 2--2 of FIG. 1; and FIG. 3 is a cross-sectional view of FIGS. A front view depicting the neck of the container to which the cap depicted in is attached. 11...Horizontal top surface 12...Top surface, 10...Edge scarlet, 14...Surface part, 18...Top part, 19...Drooping skirt 21...Lug, 20...Concave Location, 27b...
・Rear surface of the curve 27... Transition part, 25... Helical part (5 other people) Fta, 7 Fta, 2 April 2, 1981 Commissioner of the Patent Office Michibe Uga Tonoi 1, Indication of the case Showa to 2018 Kanguchi Sengandai Par3ffj? Gogo? 1m
To Ntsufu. 3. Relationship with the case of the person making the amendment Applicant's address;? -LY-xh C G Plasty Plus Measurement Do 4, Agent

Claims (10)

[Claims] (1) A container cap consisting of a top portion and a hanging skirt, the inner surface of the skirt being formed by an inner protrusion for screwing into the container neck, each of the protrusions having a surface facing toward the top as a whole. A cap for a container, characterized in that the surface has a front part extending circumferentially with a zero helical angle in the direction of rotation during application of the cap, and a rear part sloped towards the top. (2) Consisting of a top part and a hanging skirt, the inner surface of the skirt is formed by a threaded ridgeline, the first part of which extends in a spiral shape in a direction away from the top part at a first helical angle, and the end of the ridgeline farthest from the top part; A cap for a container, characterized in that a second portion of the portion has a smaller helical angle. (3) The cap according to claim 2, wherein the small helical angle has a value of zero or approximately zero. (4) The container cap according to claim 2 or 3, wherein the two portions of the ridge line meet in a smooth curve. (5) The container according to any one of claims 2 to 4, wherein the second portion of the ridgeline has a greater axial thickness than the first portion. cap. (6) In a combination of a container and a cap for the container, the container has a neck forming a mouth, and an outer surface thereof formed by a plurality of external threaded protrusions each having a surface facing away from the mouth. each of said surfaces has a rear portion having a helical angle of zero when considered in the direction of rotation when the cap is put on, and a front portion inclined toward the mouth; The cap consists of a top and a depending skirt, the inner surface of the skirt being formed by an inner protrusion for threaded engagement with the outer protrusion on the container neck, each of the inner protrusions having a surface facing towards the top; A combination of a container and a cap for a container, characterized in that it has a front part with a zero helical angle when considered according to the direction of rotation when worn, and a corrugated end part inclined towards the top. (7) having a neck whose outer surface is constituted by a plurality of circumferentially spaced ridges with a large number of threads, the lower surface of each ridge spiraling in a direction away from the top of the neck; and a molded plastic cap removably mounted on the closure neck. wherein the cap comprises a top and a depending skirt, the inside surface of the skirt providing each of a plurality of threads corresponding to that of the container, and each of the ridges on the cap having a first spiral extending away from the top; and a second portion having a zero or nearly zero helical angle at its end furthest from the top, when both portions engage the ridge on the container and the cap is fully screwed on. A combination of a container and a molded plastic cap, characterized in that the sealing surface of the cap is configured to enter into engagement with a cooperating surface of the container. (8) A transfer ring is provided at the bottom of the threaded ridge line, and the axial thickness of the second portion of the ridge line on the cap is slightly smaller than the distance between the lower surface of the end of each ridge line on the container and the upper surface of the transfer ring. The combination according to claim 7, characterized in that it is large. (9) The combination according to claim 7 or 8, wherein the two portions of the ridgeline meet in a smooth curve. (10) Container neck where the circumferential spacing between the front end of each threaded ridgeline on the cap and the rear face of the helical portion of the threaded ridgeline is measured at the position closest to the front face of each ridgeline on the container neck and the top of the neck. 10. A combination according to claim 9, characterized in that the circumferential spacing between the rear surfaces of the upper succeeding ridges is slightly greater.