JPS61217348A - Pull-tab for opening can body of can body 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 (Field of Industrial Application) The present invention relates to a pull tab for opening the lid of a can body container such as a fully open can.

(Prior art) In general, fully open type negative pressure cans have high rigidity pull tabs, and the pull tabs may be attached to the lid body. Since it is attached closely to the flannel, it is difficult to raise the pull tab and put your finger on it. Therefore, this is a factor, not only from a mechanical point of view of the amount of force required to break the Nononel score line, but also from a sensory point of view, such as whether or not it is easy to raise the pull tab. , the above-mentioned can body gives the impression to the user that opening property is poor.

As a means to improve the pullability of the pull tab, for example, t
However, in this case, when the cans are stacked, the tip-up part of the pull tab touches the bottom of the other can. This is especially noticeable when the lid panel bulges due to bulge pressure.For this reason, if extreme tip-up occurs, no improvement in the pull tab's tendency to cause damage can be expected.

Conventionally, the following methods have already been proposed to improve the pullability of this type of pull tab.

(b) As shown in Figures 12 and 13, 1 tab 3
A bead 32 protruding downward is provided at the tip of the pull tab 31.
The bead 32 comes into contact with the surface of the panel 33 for the first time when the
-22957).

(b) As shown in FIG. 14, the ring portion 35 and flat plate portion 36 of the pull tab 31 are jointly connected via the strap 37, and when the pull tab 31 is raised, the ring portion 35 is moved by the hinge action of the strap 37. It is designed to be easily triggered (Japanese Patent Publication No. 7680/1983).

(c) As shown in FIGS. 15 to 17, the pull tab 3
A line of weakness consisting of a horizontal notch 38 is provided on the upper surface of the ring portion 35 of No. 1, and when the pull tab 31 is pulled up, a part of the ring portion 35 is bent at the notch 38 to make it easier to place a finger on the ring portion 35. (Utility Model Publication No. 47-30057)
.

(Problems to be Solved by the Invention) However, the above-mentioned conventional technology has the following problems.

In the configuration 0), the bead 32 comes into contact with the surface of the nof flannel 33 for the first time when the pull tab 31 is raised to a certain extent. Compared to the case where the pull tab 31 is broken by pressing the pull tab 31, the ability to pull up the pull tab 31 is improved somewhat. However, since the pull tab 31 is integrally formed and has sufficient rigidity, and is fixed to the panel 33 via a rivet 39, the pull tab 31 is still insufficient in terms of its pulling ability. .

In the configuration (b), the ring portion 35 of the pull tab 31
Because it can be easily bent and raised at the strap 37,
Pull tab 31 can be easily raised. However, since the pull tab 31 has a two-piece structure consisting of the ring part 35 and the flat plate part 36, the amount of plate material that makes up the pull tab 31 is large.
In addition to increasing the cost, the pull tab 31 becomes larger due to the provision of the strap 37, making it difficult to use in a small lid body.

In the configuration (c), the ring portion 35 of the pull tab 31
Since it is bent at the line of weakness, the pull tab 31 can be easily raised and the pull tab i1 does not become large. However, as the part forming the line of weakness, that is, the part 40 left by the notch 38, is the part bent on the back side of the ring part 35, as shown in FIG. It becomes brittle due to υ work hardening due to processing, and is more likely to crack than the corresponding portion 40 when opening.

Furthermore, when the ring portion 35 is pulled up, as shown in FIG. 17, both upper ends of the ring portion come into contact with each other via the lines of weakness to prevent further bending. Therefore, tensile stress acts on the portion 40 due to the vertical action using the contact portion as a fulcrum, and there is a risk that the portion 40 is likely to break at the line of weakness, making it impossible to open.

The present invention has been made in order to solve the problems of the conventional example, and its purpose is to have a one-piece structure that can be manufactured at low cost, and - to prevent cracks in the ring part. An object of the present invention is to provide a pull tab for opening a lid of a can which prevents the occurrence of the problem and allows easy finger hooking.

(Means for Solving the Problems) Therefore, in order to achieve the above object, the present invention connects a ring portion having a finger hole and a plate portion fixed to a lid of a can. In the pull tab for opening the lid of a can container, the pull tab for opening the lid of a can is formed integrally with the inner and outer peripheral edges of the ring part and the outer peripheral edge of the plate-like part by bending them downward. A non-bending portion with a flat plate shape in cross section is provided on the upper surface located on the pulling side and at a corresponding position on the straight line, and by bending the ring portion of the pull tab at the non-bending portion, the finger hook can be bent. It is configured such that a part of the hole can be separated largely from the surface of the lid body.

(Example) The present invention will be explained below based on the illustrated example.
1 to 8, reference numeral 1 denotes a pull tab, and this pull tab 1 is attached to a rivet 3 integrally protruding from a 14-channel 2 constituting the lid, so that the rivet 3 can be pulled up. It is located in the inner part of the main score line 4 circularly carved along the outer periphery of the panel 2, that is, within the opening piece 5. In the figure, 6 indicates an auxiliary score line.

The pull tab 1 is composed of a planar substantially annular ring portion 8 having a finger hole 7, and a planar substantially trapezoidal plate portion 9 fixed to the motherboard 2 via a rivet 3.
and the plate-like portion 9 are continuously and integrally formed. The inner and outer peripheries of the ring portion 8 and the outer periphery of the plate-like portion 9 are bent downward along the outer periphery, except for a portion of the tip of the plate-like portion 9 and a non-bending portion 16, which will be described later. It is reinforced by an edge 10 and an edge 11 bent downward along the inner periphery, and the outer periphery edge 10 is continuous from the ring part 8 to the plate-like part 9. The end 12 of the ring part 8 on the raising side is
It is formed thinner than other parts.

The plate-shaped portion 9 is provided with a flat portion 13, and a rivet hole 14 is bored in the center of the tip of the flat portion 13. The peripheral edge of the flat portion 13 is bent upward, and this bent portion 15 is continuous with the upper end surface of the pull tab 1. The bent portion 15 at the tip of the plate-shaped portion stands up slightly from the surface of the panel 2 and has a V-shaped cross section, increasing the rigidity of the tip of the plate-shaped portion 9.

Non-bending portions 16 having a flat cross-section in which the inner and outer peripheral edges of the ring portion 8 are not bent downward are provided on the upper surface located at both ends of the ring portion 8 at corresponding positions on the linear direction line. There is. That is, as shown in FIG. 2, the plate material 17 from which the pull tab 1 is formed by press molding or the like has an inner peripheral edge 1 corresponding to the position where the non-bending portion 16 is provided.
A thousand-sided approximately U-shaped notch 1 on the o and outer peripheral edge 11, respectively.
8.18 is provided. Therefore, when the inner and outer peripheral edges 10.11 of the pull tab 1 are bent by press forming or the like, the non-bending portion 16 is left without being bent and remains flat in cross section. As shown in FIG.
1.10 Bending -l - In order to reliably prevent breakage from the edge of the processed part, a weakened line 19 with a thinner wall thickness in an arcuate cross section is used as a trigger for bending.
is provided.

In the above configuration, the pull tab of the present invention is used in the following manner. That is, 1. As shown in FIG. 6, put your finger on the rear end of the ring part 8 of the pull tab 1 and pull up the
As shown in the figure, the rear side of the ring part 8 is formed into a non-bending part 16.
By doing this, it is made to stand up almost perpendicularly to the 4th channel 2. At this time, since the non-bending portion 16 is not bent, work hardening does not occur due to the stress release effect, and breakage can be prevented. Moreover, since a line of weakness 19 is provided on the back surface of the non-bending portion 16 as a trigger for bending, when the rear side of the ring portion 8 is raised up, it is bent from the non-bending portion 16 and the non-bending portion 16 is bent. Breakage due to bending from the edge of the processed portion 16 can be more reliably prevented. However, some of the /19 channels 2
By hooking a finger into the hole 7 and pulling up the pull tab 1, the main score line 4 and the auxiliary score line 6 of the panel 2 are broken, and the pull tab 1 is pulled up using the inside of the rivet 3 as a fulcrum. is rotated. Then, by pulling the pull tab 1 toward you as shown in FIG.
The entire circumference of the opening piece 5 is broken and removed along the main score line 4 from the mother panel 2.

By the way, in the pull tab of the present invention, since the ring portion 8 is bent toward the outer circumferential side of the lid body, the distance from the fulcrum 20 of the pull tab 1 is shortened, but the opening property is improved as follows. FIG. 9 shows a model of the opening mechanism of the pull tab 1, where 1' indicates a conventional pull tab and 1 indicates the pull tab of the present invention.

In order to open the panel 2, the force applied to the pull tab 1 is F for the conventional pull tab 1' and F for the pull tab 1 of the present invention. - θCo'l is the angle that the forces F and F make with the vertical direction. Since the conventional pull tab 1' has poor pullability, the θ angle becomes larger than that of the θ pull tab 1.

Since the force required to break the panel 2 when the pull tab 1 is pulled up, that is, the moment when the pull tab 1 is opened, is the same for both the conventional pull tab 1' and the pull tab 1 of the present invention, the following equation holds true.

Fl・part θ,・4 = F2・shear(ψ−θ,)・t,
...(I) Here, 1. is the distance from the fulcrum 20 of the conventional pull tab 1' to the rear end of the ring portion 8, and t is the distance from the fulcrum 20 of the pull tab 1 of the present invention to the rear end of the ring portion 8.

Furthermore, the following equation holds true from the geometrical relationship.

(2) Hit ψ=/1° Therefore, Equation (11) is transformed as follows.

Fl・Possible, θ, @t, =F,・Width θ,・t2
...(If) Therefore, in the present invention, t2 is 3A4~
%t1, and since 4 is small, the magnitudes of Fl and F are compared by approximating θ and kiO.

(1) t2=%1. In the case of (U), Flcca
θ,=F,xO,5000.

Therefore, since F1=F when θ=60°,
If θr >60', then Ft > F, so
The pull tab 1 of the present invention has a smaller opening force F2 and is easier to open.

-(it) When t, = %t1, from equation (■), F, plane θ, = F, x O, 7115.

Therefore, since F1=F2 when θ is ±45.357°, if the recommendation is >45.357°, Fl>Fl, so the opening force F of the delta buoy of the present invention is smaller. , opening becomes easier.

As is clear from the above consideration, even when t+ = 3A4, if θ is 60″ or more, F is better than F,
It will be bigger. Actually, at the initial opening, θ, 1 is 6
0° or more, and in the case of the pull tab 1 of the present invention, the non-bending portion 16 is easy to bend, so θ is small at about 0 to 90, and the present invention improves the opening property from a mechanical perspective. .

It should be noted that the pull tab with the quick-seat method or lance cut is exactly the same as the above except that the fulcrum 20 is moved to the tip of the pull tab 1, as shown in FIG.

FIG. 11 shows another embodiment of the weakening line, in this embodiment the weakening I! 19 consists of arc-shaped thin wires, and two wires are provided at intervals on the back surface of the non-bending portion 16.

(Effects of the Invention) The present invention has the above-described configuration and operation, and is provided with a non-bending portion having a flat plate shape in cross section on the upper surface of the ring portion of the pull tab located on the tab raising side and at a corresponding position on the straight direction line. By bending the ring part of the pull tab at the non-bending part, a part of the finger hole can be moved far away from the surface of the lid, so it is easy to insert your finger into the finger hole of the ring part. The pull tab can be easily raised by hanging, and since the pull tab has a one-piece structure, it can be manufactured by conventional methods at low cost. Furthermore, since the unbent portion of the ring portion is not bent, there is no risk of cracks occurring in the ring portion due to caroe hardening, etc., and the lid of the can can be opened reliably. be able to.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view showing a pull tab according to the present invention, FIGS. 1-) are sectional views taken along the line ■-n in FIG. , Figure 3 is the same as Figure 1 (
Fig. 4 is a bottom view showing the non-bending portion of a), Fig. 5 is a sectional view taken along the ■-w line in Fig. 4, and Figs. 6 to 8 are cross-sectional views of the can body and container. FIG. 9 is a schematic diagram showing a pull tab opening mechanism according to the present invention; FIG. 10 is a schematic diagram showing another pull tab opening mechanism according to the present invention; FIG. 12 and 13 are longitudinal sectional views showing a conventional pull tab, FIG. 14 is a plan view showing another conventional pull tab, and FIG. 15 is a conventional pull tab. FIG. 16 is a cross-sectional view of a main part of the same pull tab, and FIG. 17 is a vertical cross-sectional view showing the open state of the same pull tab. Explanation of symbols 1...Delta f 7...N hanging hole 8...Ring part ゛ 9...Plate-shaped part 10.11...Inner and outer periphery 16...Non-bending part Fig. 1 (a) 1 Delcube 10 Takuki 16 Kikyoku/Choka/Part 9 grade 4 majors!
Fat hexagram + + bow and ≧ see,
+1 nτ 蓓下 -m-f, / 7' / , /-, 10 edges I l I! ■ 11 shares 1[ll? 1 tsubo Lihe 1 ton) Li2 ゝ-~
, ``LT''''-2, ]g→floor q"addition

Claims (1)

[Claims] A ring part having a finger hook hole and a plate part fixed to the lid of the can are continuous and integrally formed, and the inner and outer peripheries of the ring part and the outer periphery of the plate part are bent downward. In a pull tab for opening the lid of a can that is reinforced by processing, a non-bending process with a flat cross section is applied to the upper surface of the ring portion located on the tab pulling side and at a corresponding position on the linear direction. The can body container is characterized in that by bending the ring part of the pull tab at the non-bending part, a part of the finger hook hole can be separated largely from the surface of the lid body. Pull tab for opening the lid.