JPH0127807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing a base metal for a can opening when forming a can opening at a predetermined position on the top plate of a case, and a base metal for a can opening used to carry out the method. A method for fixing a base metal for a can that does not require rubber lining to obtain airtightness, and a can that is not affected by the type of filling in the can while also providing a base metal for a can. The purpose is to provide the following.

Another object of the present invention is to simplify and speed up the work of caulking the can base metal to the opening of the top plate, and to simplify the structure of the can base metal itself.

Conventionally, the opening of the case is generally secured by caulking the clamping piece 2 of the base metal 1 to the clamping piece 5 provided in the opening 4 of the top plate 3 by the method shown in FIGS. 1 and 2. A method of configuring the structure while firmly fixing it is widely practiced.

However, since it is difficult to expect complete watertightness or airtightness depending on the caulking part 6 between both the clamping pieces 2 and 5, by applying rubber (not shown) between the clamping pieces 2 and 5. However, it is necessary to take into account defects such as the rubber eluting due to the contents filled in the can and changes in the rubber itself over time, so the type of rubber should be selected depending on the type of contents filled in the can. Not only does this depend on the type of contents filled in the housing, but depending on the type, there may be cases where complete watertightness or airtightness cannot be expected.

Therefore, in order to eliminate the defects in the conventional fixing method of can opening base metals, a special public
A method for fixing a base metal for a can opening has just been developed and proposed as described in the 20192 publication, but the present invention provides a base metal for a canister that has a simpler structure and is rich in watertightness and airtightness compared to the method described in the same publication. A method for fixing gold has been developed and proposed here.

Further, the can base metal 5 described in Japanese Patent Publication No. 54-20192 is configured to be caulked to the clamping portion 6a of the top plate 6, in addition to the configuration of the cylindrical portion 5a.
an inclined portion 5b extending diagonally outward from the lower end of a;
This requires a structure having a clamping part 5c extending downward from the inclined part 5b and a bending part 5d extending inwardly and further upward from the clamping part 5c, making it difficult to form the can base metal 5. Since the molding accuracy of each component directly affects the watertight and airtight performance of the caulking part with the top plate and other structural performance, it is required to control the molding accuracy of the can base metal 5, and If the precision is poor, there are problems such as complicating the work of setting the can base metal 5 onto the clamping portion 6a of the top plate 6.

As described above, the present invention solves the complicated structure of the can base metal itself, simplifies the configuration of the can base metal, improves molding accuracy, and also connects the can base metal to the top plate. We are hereby proposing a base metal for can openings that can simplify and speed up the caulking work.

That is, in the method of fixing the base metal of the present invention, an opening is provided at a predetermined position on the top plate, and the rim of the opening is bent downward to form a cylindrical clamping part, and the cap is fixed. An annular locking edge having an outer diameter larger than the inner diameter of the top opening is provided on the cylindrical portion of the base metal that provides the mounting portion, and the lower end of the cylindrical portion is provided with an annular locking edge that is connected to the clamping portion of the top plate opening. After forming the cylindrical clamping part, fit the bottom clamping part of the base metal into the clamping part of the top plate opening while locking the annular locking edge of the base metal to the upper lip of the top plate opening. At the same time, the clamping part of the top plate opening and the clamping part of the base metal are caulked together, and the annular locking edge of the cylindrical part of the base metal is crimped along the upper mouth edge of the top plate opening. The method is characterized in that the base metal is fixed to the top plate opening while sandwiching the edge of the top plate opening between the caulking part and the crimping part of both the clamping parts, and can be used directly for carrying out such a method. The base metal for the can is provided with a cap attachment part, and an annular locking edge having an outer diameter larger than the inner diameter of the top plate opening is provided on the cylindrical part, and a ceiling is provided on the lower side of this annular locking edge. The present invention is characterized in that it is constructed by providing a cylindrical clamping part having an outer diameter that can fit into the clamping part of the plate opening.

Therefore, in the method for fixing a base metal for a can opening of the present invention, the top plate opening and the base metal clamping part are sandwiched together, and the annular locking edge of the base metal is attached to the upper edge of the top plate opening. Since the opening edge of the top plate is clamped between both clamping parts and the crimp part of the annular locking edge, it is possible to secure watertightness and airtightness at the opening of the case. It can be obtained without rubberizing, and since it is rubber-free, it can be used regardless of the type of contents filled in the case.

In addition, by simply providing an annular locking edge on the base metal to be fixed, processing on the top plate can be carried out in exactly the same manner as in the past.
Tokuko Sho 54 as a diagram or its improvement method
This can be carried out using a simple method that does not require complicated bending of the clamping piece, such as the method described in Publication No. When fitting the cylindrical clamping part on the side to the clamping part in the cylindrical part of the top plate, insert the annular locking edge provided on the outside of the cylindrical part of the base metal into the upper opening edge of the top plate opening. By locking the base metal to the fixed part of the top plate, the base metal is always set in the state where the required length of the clamped part is fitted to the clamped part of the top plate cylindrical part. Since the crimping process of both clamping parts and the crimping process of the annular locking edge are carried out, both processes can be carried out accurately. When setting the base metal, the annular locking edge of the cylindrical part of the base metal can be set while being locked to the upper lip of the top plate opening, and the base metal can be set in a set state with respect to the top plate. It can be carried out without requiring special jigs, etc., improves the workability and stability of the fixing work, eliminates variations in the accuracy of the fixed part, and improves the quality of the product itself. be.

Furthermore, the strength of the can opening itself can be improved due to the structure of both the caulking parts of the clamping parts and the crimp part of the annular locking edge, thereby preventing the can opening part from being crushed when the cans are stacked. It is something that can be done.

The fixing method of the present invention will be explained below with reference to the illustrated base used directly for carrying out the fixing method.

10 is a base metal for a can opening according to the present invention, and this base metal 1
0 is a tapered part for guiding the expansion of each elastic hook piece of the cap (cap with elastic hook pieces - a cap with a large number of elastic hooks around a top plate with a bulging part, not shown). 11 and a recess 12 for engaging each elastic hook piece.A cap mounting part 13 is provided, and the inner diameter of a cylindrical clamping part 22 provided in the opening 21 of the top plate 20 is provided on the lower side of this mounting part 13. A cylindrical portion 14 having the same or slightly smaller outer diameter is extended, and an annular locking edge 15 with a V-shaped cross section is protruded from the outer periphery of the cylindrical portion 14. The top plate 20 is formed to have a larger diameter than the inner diameter of the opening 21, and a short clamping part 16 having the same diameter as the cylindrical part 14 is extended below the annular locking edge 15, thereby providing elasticity. It is integrally molded from the material.

Note that the clamping portion 22 of the opening 21 of the top plate 20 described above
is the top plate 2, contrary to the clamping part in the conventional fixing method.
0 (i.e., inside the case when the top plate is attached to the case).

In addition, the length of the clamping part 16 of the base metal 10 is the same as that of the top plate 20.
It is formed longer than the length of the clamping part 22 of the top plate 20 so that the lower end 16a of the clamping part 16 of the base metal 10 can be rolled inside the lower end 22a of the clamping part 22 of the top plate 20 when both are caulked. It is desirable that the structure be configured as follows (see Figures 3 and 4).

Now, the base metal 10 consisting of the above structure is replaced with the top plate 20.
To explain the method of fixing it to the opening 21 of the base metal 10, first, as shown in FIG.
6 is fitted into the clamping portion 22 of the top plate 20, and the alloy 10 is placed and set on the top plate 20.

Furthermore, when placing and setting the base metal 10 on the top plate 20, as shown in FIG. Since it is formed to have a larger diameter, the annular locking edge 1
5 allows the base metal 10 to be placed while being locked to the edge of the opening 21 of the top plate 20. Moreover, the base price is 10
Regarding the lengths of the clamping parts 16 and 22 of the top plate 20, the clamping parts 16 of the base metal 10 are connected to the clamping parts 16 and 22 of the top plate 20 by the length necessary to obtain the desired effect. Regarding the dimensional accuracy of fitting while falling into the clamping part 22, by simply setting the protruding position of the annular locking edge 15 in advance, it is possible to always carry out appropriate caulking, and at the same time The work of setting the metal 10 onto the top plate 20 can be carried out easily and quickly with high precision at all times.

After that, the clamping part 16 of the base metal 10 and the top plate 20 are
The clamping part 22 is rolled inward and crimped, and the annular locking edge 15 of the base metal 10 is crushed and crimped along the upper edge 21a of the opening 20 of the top plate 20, and the crimped part 30 is crimped. The base metal 10 is fixed to the opening 21 of the top plate 20 by sandwiching the opening edge 21a of the top plate 20 between the parts 31. (See Figure 4).

Therefore, in the above method, each of the fitting and setting process of the base metal 10 to the opening of the top plate 20, the caulking process of the caulking part 30, and the crimping process of the annular locking edge 15 is performed by a series of processing processes. However, it is particularly desirable to process both the crimping process and the crimping process at once using a press, but it is of course also possible to perform them in separate processing processes.

In addition, in the construction of the base metal 10, the cross-sectional shape of the annular locking edge is changed to the V-shape shown in the third figure, and the fifth
As shown in Figure a, a bulge 150 formed into a V-shape
In addition to the case where the structure is composed of a double-polymerized piece 151 as shown in FIG.
5. In the illustrated embodiment, the ring is molded integrally with the cylindrical portion 14; This can also be implemented by fitting and fixing a ring-shaped polymer piece that is bent and polymerized to the outside.

For the base metal 10 shown in FIG. 6a, the opening edge 18
When curled inward, base metal 1 shown in figure b
0 shows an embodiment in which the opening edge 19 is curled outward.

As is clear from the above description, according to the method of the present invention, compared to the conventional method of this kind, in addition to the caulking part in which both the sandwiched part of the base metal and the top plate are caulked together, An annular locking edge that protrudes from the outer periphery of the cylindrical portion and has an outer diameter larger than the inner diameter of the top plate opening is crimped along the upper edge of the top plate opening, and the crimped portion of the annular locking edge and Since the base metal is fixed to the top plate while being held between the upper and lower parts of the top plate opening by both of the caulking parts, the watertightness and airtightness of the fixed part of the base metal are improved, and the fixed part of the base metal is fixed. This eliminates the need for structural means necessary to obtain watertightness and airtightness, such as applying rubber to the surface of the container, and at the same time eliminates the disadvantages of the types of filling contents that are restricted by applying rubber. The strength of the caulking portion of the base metal can be improved by both the caulking portion and the crimp portion of the annular locking edge.

In particular, with regard to the work of setting the base metal when fixing the base metal to the top plate, the annular locking edge allows the base metal to be set while being locked to the top plate opening, which not only simplifies and speeds up the work. Therefore, the overlapping length of the sandwiched parts of both the base metal and the top plate is always adjusted to the appropriate length by the annular locking edge protruding from the base metal. It is possible to prevent variations in the quality and precision of the fixed state of the base metal, and improve the precision of the product.

In addition, according to the base metal of the present invention, the cylindrical part of the base metal is provided with a protruding annular locking edge having an outer diameter larger than the inner diameter of the opening of the top plate, so that it can be caulked with the top plate. It is possible to form the necessary configuration, just like a conventional base metal.
Since there is no need to form a complicated clamping part, the structure of the base metal itself can be simplified, and the deterioration in quality of the caulked part due to variations in dimensional accuracy between base metals can be extremely minimized, and it is inexpensive. It has the following effects:

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing a conventional method for fixing a base metal, and FIG. 3 is a partially omitted cross-sectional view showing a base metal according to the present invention and a state in which it is fitted into a top plate opening.
Fig. 4 is a sectional view of the main part showing the fixed state, Figs. FIG. 7 is a partially omitted cross-sectional view of an embodiment other than the base metal shown in the third figure. 10 is a base metal, 11 is a tapered part, 12 is an engagement recess, 13 is a cap mounting part, 14 is a cylindrical part,
15, 150, 151 are annular locking edges, 16 is a clamping part, 20 is a top plate, 21 is an opening, 22 is a clamping part,
30 is a caulking part, and 31 is a crimping part.

Claims (1)

[Scope of Claims] 1. A table having an opening at a predetermined position on a top plate, bending the edge of the opening downward to form a cylindrical clamping part, and having a cap mounting part. The gold cylindrical part is provided with an annular locking edge having an outer diameter larger than the inner diameter of the top plate opening, and the lower end of the cylindrical part is provided with a cylindrical clamping edge that connects with the clamping part of the top plate opening. After forming the attachment part, fit the annular locking edge of the base metal to the upper edge of the top plate opening and fit the lower end clamping part of the base metal to the clamping part of the top plate opening. The clamping part of the plate opening and the clamping part of the base metal are caulked together, and the annular locking edge of the cylindrical part of the base metal is crimped along the upper edge of the top plate opening, and both clamping parts are crimped together. 1. A method for fixing a base metal for a can mouth, comprising: fixing the base metal to a top plate opening while sandwiching the edge of the top plate opening between a caulking part and a crimping part. 2. The method for fixing a can base metal according to claim 1, characterized in that the crimping process of both the clamping parts and the crimping process of the annular locking edge are performed in separate processes. 3. The method for fixing a can base metal according to claim 1, characterized in that the crimping process of both the clamping parts and the crimping process of the annular locking edge are carried out simultaneously. 4 In addition to providing a mounting portion for the cap, an annular locking edge having an outer diameter larger than the inner diameter of the top plate opening is provided on the cylindrical portion, and the top plate opening is clamped below the annular locking edge. 1. A base metal for a can opening, characterized in that it is constructed by providing a cylindrical clamping part with an outer diameter that can be fitted into the main part. 5. The base metal for a can opening according to claim 4, characterized in that the annular locking portion is configured by forming a U-shaped cross section. 6. The base metal for a can opening according to claim 4, wherein the annular locking edge is formed by forming a V-shaped cross section. 7. The base metal for a can mouth according to claim 4, wherein the annular locking edge is formed of a double-polymerized piece. 8. The can according to claim 4 or any one of claims 5 to 7, characterized in that the annular locking edge is formed by integrally molding the base metal cylindrical part. Base money for mouth. 9. The annular locking edge is constructed by providing an annular ring having a U-shaped cross section, a V-shaped cross section, or an overlapping piece that is externally fitted and fixed to the cylindrical part of the base metal. The can opening base metal according to item 4 or any one of items 5 to 7.