JPS6122828Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixing structure for fixing a bottomed cylindrical case inside a thin-walled cylindrical body.

A conventional fixing structure of this type will be explained with reference to FIG. In the figure, 1 is a thin-walled cylindrical body, 2 is a cylindrical case with a bottom, and 3 is a countersunk screw. After aligning the holes with screw holes provided in the case 2, the case 2 is fixed to the thin-walled cylinder 1 by tightening countersunk screws 3 from the outside of the thin-walled cylinder 1.

However, this fixing structure has the disadvantage that a plurality of countersunk screws are required in order to improve the strength of the countersunk hole provided in the thin-walled cylindrical body, which increases the number of work steps during assembly. In addition, if the machining accuracy of the countersink hole of the thin-walled cylinder and the screw hole of the case is poor, the head of the countersunk screw will protrude from the outer peripheral surface of the thin-walled cylinder, requiring high machining accuracy. It also had the disadvantage of being expensive.

The purpose of the present invention is to solve these drawbacks, and for this purpose, at least two fixing holes are provided in the thin-walled cylindrical body, and the bottomed cylindrical case is divided into two in the vertical direction to form a split case. A fixing convex portion having a thickness equal to or less than the wall thickness of the thin-walled cylindrical body is formed on the outer peripheral surface of both divided cases, and a tapered screw hole is provided in the bottom divided surface, Inserting both divided cases into the thin-walled cylindrical body and tightening the taper screws into the screw holes, the two divided cases are pushed apart, thereby fitting the fixing convex portions of both divided cases into the fixing holes of the thin-walled cylindrical body. It is characterized by being fitted together.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. In the figures, reference numeral 4 denotes a thin-walled cylindrical body, and this thin-walled cylindrical body 4 has at least two fixing holes 5.
a and 5b are each provided at a predetermined position. 6
A and 6b are a pair of divided cases, and the divided cases 6a and 6b are a bottomed cylindrical case divided into two in the vertical direction. Fixing protrusions 7a and 7b having a thickness equal to or less than the thickness of the thin-walled cylinder 4 are formed on the outer peripheries of the divided cases 6a and 6b, respectively, and a central portion of the divided surface at the bottom is formed. A tapered screw hole 8 is provided in the. 9 is a tapered screw.

This configuration consists of a divided case 6 as shown in FIG.
Align parts a and 6b at their split surfaces, insert them into the thin-walled cylindrical body 4, and tighten the tapered screws 9 into the screws 8 provided at the bottoms of both split cases 6a and 6b. Both split cases 6a and 6b are pushed apart vertically, and as a result, both split cases 6
The fixing convex portions 7a and 7b of a and 6b are thin-walled cylindrical body 4
It fits into the fixing holes 5a and 5b. Then, when both divided cases 6a and 6b are further pushed apart with the taper screw 9, both divided cases 6a and 6b are opened as shown in FIG.
The outer circumferential surfaces of a and 6b are in close contact with the inner circumferential surface of the thin-walled cylindrical body 4, and in this state, the fixing protrusions 7a and 7b are completely fitted into the fixing holes 5a and 5b, and both divided cases 6a , 6b are firmly fixed within the thin-walled cylindrical body 4.

In addition, since the fixing convex parts 7a and 7b have a thickness equal to or less than the wall thickness of the thin-walled cylinder 4 as described above, they protrude from the outer peripheral surface of the thin-walled cylinder 4 in the fixed state. Never.

As explained above, the present invention can reliably fix a pair of split cases forming a bottomed cylindrical case inside a thin-walled cylindrical body by simply tightening a single taper screw. The assembly work is easier compared to the conventional method, and the number of assembly steps and number of parts can be reduced.

In addition, the fixing strength is provided by the fixing holes in the thin-walled cylinder and the fixing protrusions on the split case, so in order to improve the strength, these fixing holes and fixing protrusions must be There is also the effect that it is possible to improve the strength without increasing the number of parts or the number of assembly steps.

Furthermore, with respect to the circumferential length of the fixing hole,
Even if the length of the fixing convex part in the circumferential direction is made small enough to create a certain amount of clearance, it will not be a problem for fixing the thin-walled cylindrical body and the split case, so the fixing hole and the fixing convex part can be machined. As for accuracy, only the dimension in the vertical direction is required, and the dimensional accuracy in the circumferential direction, which is difficult to achieve machining accuracy, is greatly relaxed, so manufacturing becomes easier and the manufacturing cost is reduced.

Since it has the above effects, the present invention can be used, for example, to fix a sonobuoy and a component case built therein.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a conventional example, FIG. 2 is a vertical sectional view showing an embodiment of the present invention in a state in the middle of assembly,
Figure 3 is a sectional view taken along the line A-A in Figure 2, Figure 4 is a longitudinal sectional view showing the assembled state, and Figure 5 is a line B--A in Figure 4.
It is a sectional view taken along the B line. 4... Thin wall cylinder body, 5a, 5b... Fixing hole,
6b...Divided case, 7a, 7b...Fixing protrusion, 8...Screw hole, 9...Tapered screw.

Claims (1)

[Scope of utility model registration request] In a structure in which a bottomed cylindrical case is fixed in a thin-walled cylindrical body, at least two fixing holes are provided in the thin-walled cylindrical body, and on the other hand, the case is divided into two in the vertical direction to form a pair of divided cases, and both A fixing convex portion having a thickness equal to or less than the wall thickness of the thin-walled cylinder is formed on the outer circumferential surface of each of the divided cases, and a tapered screw hole is provided in the divided surface at the bottom of the divided case, Inserting both divided cases into the thin-walled cylindrical body, and pushing the two divided cases apart by tightening the taper screws into the screw holes, the respective fixing convex portions are fitted into the fixing holes of the thin-walled cylindrical body. A fixing structure between a thin-walled cylindrical body and a case, which is characterized in that they are fixed together.