JPH0335457Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a crimping jig for crimping and fixing the upper edge to a cylindrical inner case, such as in temperature sensors used in jars, rice cookers, etc. Regarding.

[Conventional technology]

A conventional upper cover tightening jig for the opening edge of a cylindrical inner case is provided with a circular recess 4 having a step 11 at the center of the bottom surface 3 of the upper mold 1, as shown in FIG. 4a. Further, as shown in FIG. 4b, a pedestal 7 is provided inside the outer circumferential cylinder 5 of the lower mold 2 and is urged upward by a receiving spring 12, and is moved up and down as the upper mold 1 is pressed and removed. Here, the top cover 10 is placed on the pedestal 7 as shown in FIG.
By pressing the upper mold 1, the pedestal 7 resists the force of the spring 12 and lifts the step 1 of the upper mold 1.
The outer edge of the upper lid 10 is crimped between the edge of the outer cylinder 5 of the lower mold 2 and the inner edge of the outer cylinder 5 of the lower mold 2.

[Problem that the invention attempts to solve]

When the upper lid 10 is placed on the inner case 8 and crimped using the upper mold 1 and the lower mold 2 as shown in FIG. 5, a gap 13 is created between the upper lid 10 and the upper mold 1. , the force that presses the entire periphery of the upper lid 10 by crimping is concentrated on the upper surface of the upper lid 10, and after crimping, the upper lid 10
The disadvantage is that the top surface shape is deformed and a uniform curved surface cannot be obtained.

[Means for solving problems]

The present invention eliminates such drawbacks of the conventional one, and the outer circumferential cylinder 5
In a crimping jig formed by pressing an upper mold 1 onto a lower mold 2 for placing an upper lid 10 on an opening edge 9 of an inner case 8 placed on a pedestal 7 provided inside, the outer circumferential cylinder 5
This crimping jig consists of a lower mold 2 having a plurality of concavities and convexities toward the center on the inner edge, and an upper mold 1 having a shallow arcuate recess in cross section at the center of the bottom surface.

[Effect]

According to the present invention, the concave portion having an arcuate cross section at the center of the upper mold presses the surface of the upper lid in close contact, so that the upper lid has a uniform shape.

〔Example〕

Examples of the tightening jig of the present invention are shown in Figure 1, Figure 2, and Figure 3.
As shown in the figure. As shown in the external view seen from the bottom shown in FIG. 1a or the longitudinal sectional view shown in FIG. Further, as shown in the external view seen from the top shown in FIG. 1b or the vertical sectional view shown in FIG. 2b, a plurality of depressions and depressions 6 are provided on the inner edge of the outer circumferential cylinder 5 of the lower mold 2, which are inclined toward the center.

Now, place the inner case on the pedestal 7 of the lower mold 2 , place the upper cover on the opening edge of the inner case, press the upper mold 1, and swage it.
The portions that were not crimped are the number of unevennesses 6 on the top cover 1.
Occurs on the edge of 0.

In addition, although the center portion of the upper lid 10 is deformed by the force directed toward the center, the force is concentrated on the recess 4 of the upper mold 1, but the shape of the recess 4 uniformly deforms the upper lid 10.
The surface shape of is uniform. Furthermore, since the parts that are not swaged are free, all excess force is concentrated on the parts that are not swaged.

Therefore, the upper cover 10 can be attached to the opening edge of the inner case 8 in the same manner as shown in FIG.

[Effect of idea]

As described above, according to the present invention, by making the shape of the recess 4 of the upper mold 1 arcuate in cross section, the shape of the surface of the upper lid 10 becomes uniform.

[Brief explanation of the drawing]

Fig. 1 is an external view of an embodiment of the crimping jig of the present invention, in which a is an external view of the upper mold seen from the bottom, b is an external view of the lower mold seen from the top, and Fig. 2 is an external view of the upper mold seen from the bottom. 1 is a vertical cross-sectional view of one side of the caulking jig in Figure 1, where a is a vertical cross-sectional view of the upper mold, b is a vertical cross-sectional view of the lower mold,
The figure is a front view of the upper cover fixed to the inner case according to the present invention, and Figure 4 is a longitudinal sectional front view with a part of the conventional caulking jig cut away. FIG. 5 is a longitudinal sectional front view of a portion of the inner case showing a state in which the top cover is pressed and crimped onto the inner case using a conventional crimping jig. In addition, 1... upper mold, 2... lower mold, 3... bottom surface, 4... recessed part, 5... outer circumferential cylinder, 6... unevenness,
7... cradle, 8... inner case, 9... opening edge, 1
0... Upper lid, 11... Step, 12... Spring, 13... Interval.

Claims (1)

[Scope of utility model registration request] A lower mold 2 in which an upper lid can be placed on the opening edge of an inner case 8 placed on a pedestal 7 provided in an outer cylinder 5.
A crimping jig consisting of an upper mold 1 for shaping and pressing the upper lid has a lower mold 2 having a plurality of unevenness 6 toward the center on the inner edge of the outer circumferential cylinder 5, and a cross section at the center of the bottom surface. A caulking jig consisting of the upper mold 1 provided with a shallow arc-shaped recess 4.