JPH07280331A - Air conditioning duct elbow - Google Patents

Abstract

PURPOSE:To eiliminate separation of a junction part and fabricate an elbow simply and inexpensively by tightening right and left junction parts of a corner part and a fitting part so as to enclose the tip end of a lower member with the tip end of an upper member. CONSTITUTION:An elbow comprises a corner part 1a and a fitting part at opposite ends of the corner part 1a for joining another duct. The corner part la and the fitting part are fabricated by joining an upper member 4 and a lower member 5 both formed into a semi-circular shape in their cross sectional one so as to tighten these members with right and left junction parts 2, 3. Although the upper and lower members 4, 5 are joined by a caulking method, the method determines the strength of an elbow and whether or not the fabrication cost can be reduced. The drawing illustrates a junction state between the right and left junction parts 2, 3 of the corner part 1a. Hereby, separation of the junction parts 2, 3 is eliminated even with use of the elbow for a long time. Further, the elbow can be fabricated very simply and inexpensively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in elbows used in air conditioning ducts.

[0002]

2. Description of the Related Art Conventionally, regarding inventions and devices relating to elbows, Japanese Patent Application Laid-Open No. 2-17293 "Air Conditioning Duct Muffling Elbow", Utility Model Application Publication Sho 62-195033.
No. “Duct silencer rectifying elbow” and utility model application publication No. 5
-79340 "Adiabatic elbow duct for adiabatic muffling" and the like exist.

However, these known "ducts"
Has a drawback that the manufacturing cost is high due to its relatively complicated structure and the large number of parts.

[0004]

SUMMARY OF THE INVENTION The present invention is an air-conditioning duct which overcomes the above-mentioned drawbacks and which can be manufactured extremely easily and at low cost without peeling of the joint even after long-term use. The purpose is to provide an elbow for use.

[0005]

According to the present invention, in an elbow for an air-conditioning duct, the left and right joints of a corner portion and a fitting portion are brought into contact with the tips of the upper and lower members so that the tip of the upper member is connected to the tip of the lower member. In an elbow for an air-conditioning duct, or an elbow for an air-conditioning duct, which is swaged so as to wrap it, the left and right joints of the corner portion and the fitting portion are aligned with the tips of the upper and lower members and are lowered by the tip of the upper member. An elbow for an air conditioning duct is characterized in that after crimping so as to wrap the tip of the member, the joint portion is pressed from the outside.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 is a front view of an elbow for an air conditioning duct according to the present invention, FIG. 2 is a vertical sectional view taken along the line AA in FIG. 1, and FIG. 3 is a vertical sectional view taken along the line BB in FIG. The present invention comprises a corner portion 1a and fitting portions 1b and 1c at both ends for connecting other ducts of the corner portion 1a. The corner portion 1a and both fitting portions are shown. 1b and 1c are joined by a method in which the upper member 4 and the lower member 5 and 10, both of which have a semicircular cross-section, are caulked by the left and right joints 2, 3, 8, 9, 11, and 12. Elbows are manufactured. Upper and lower members 4.5
The 7 and 10 are joined by the caulking method. The caulking method determines whether or not the strength of the elbow is affected and the manufacturing cost is significantly reduced. FIG. 2 shows the left and right joint portions 2 of the corner portion 1a.
3 shows the joined state, and FIG. 3 is a view showing the joined state of the fitting portions 1b and 1c. The corner portion 1a and the fitting portions 1b and 1c are joined by the tip 4c of the left and right end portions 4a, 4b, 7a, 7b of the upper member 4 and 7, respectively.
4d and the left and right end portions 5a, 5b, 10a of the lower member 5/10
This is a method of caulking the tips 5c, 5d, 10c, 10d of 10b so as to be wound around each other.

4 to 10 are partial longitudinal sectional views showing a joining process of the left and right joint portions 2, 3, 8, 9 of the corner portion 1a and both fitting portions 1b, 1c. In the first step,
As shown in FIG. 4, the tip end 4c of the left end portion 4a of the upper member 4 is outwardly stepped so that the angle with respect to the left end portion 4a is approximately 90 degrees, and the left end portion of the lower member 5 is formed. 5a
Similarly, the tip 5c is also processed and formed so that the angle is about 90 degrees outward. In the second step, as shown in FIG. 5, a part of the tip 4c of the left end portion 4a of the upper member 4 is cut and the tip 4c is cut.
Form so that it hangs. In the third step, as shown in FIG. 6, the tip 4c of the left end 4 of the upper member 4 and the tip 5c of the left end 5a of the lower member 5, and the tip 4c of the upper member 4 is the tip of the left end 5a of the lower member. Match so as to wrap 5c. Fourth
In the step, as shown in FIG. 7, the tip 4c of the left end 4 of the upper member 4 is bent so that the tip 4c of the left end 4 of the upper member 4 completely wraps the tip 5c of the left end 5a of the lower member 5. In the fifth step, as shown in FIG. 8, the left end 4 tip 4 of the upper member 4 is such that the left end 4 tip 4c of the upper member 4 completely wraps the tip 5c of the left end 5a of the lower member 5.
After c is bent, the tip 4c of the upper member 4 completely wraps the tip 5c of the lower member 5, and the tip 4c of the upper member 4 and the tip 5c of the lower member 5 are both bent and crimped downward. In the sixth step, as shown in FIG. 9, with the tip 4c of the upper member 4 completely enclosing the tip 5c of the lower member 5, both the tip 4c of the upper member 4 and the tip 5c of the lower member 5 are moved downward. Processing is performed so that the bent joint portion 2 does not project to the outside too much, that is, the left end portion 4a of the upper member 4 and the left end portion 5a of the lower member 5 are positioned on a substantially vertical line. In the seventh step, as shown in FIG. 10, the fitting portion 1b.
1c further requires a processing step, and the joint portion 2 is formed until the outer wall surface of the left end portion 4a of the upper member 4 and the outer wall surface of the joint portion and the outer wall surface of the left end portion 5a of the lower member 5 are flush with each other. Is pressed from the outside.

FIG. 11 is a diagram showing a partial vertical cross-sectional view showing another embodiment of the joining method of the joining portion 2 of the corner portion 1a. In the joining process shown in FIGS. In addition, external pressure is applied to increase the bonding strength. That is, the joining process is completed in the joining state shown in FIG.
When a part of the tips 4c and 5c of the upper and lower members 4 and 5 of the joining portion 2 shown in FIG.
5e is formed, and projections 4f and 5f are formed on the back surface of the tips 4c and 5c. The projections 4f and 5f stick to a part of the tips 4c and 5c of the upper and lower members 4.5, so that the joint portion is formed. 2 is stronger.

FIG. 12 is a diagram showing a partial vertical cross-sectional view showing another embodiment of the joining method of the joining portion 8 of the fitting portions 1b and 1c. In the joining process shown in FIGS. Further, an external pressure is applied to increase the bonding strength. That is, the joining process of the fitting portions 1b and 1c is completed in the joining state shown in FIG. 10, but the tip portions 7c and 10c of the upper and lower members 7 and 10 of the joining portion 8 shown in FIG. When pressed from above, pressing grooves 7e / 10e are formed in the tips 7c / 10c, and projections 7f / 1 are formed on the back surface of the tips 7c / 10c.
0f is formed, and the protrusions 7f and 10f are attached to the upper and lower members 7
Since it sticks to a part of the tips 7c and 10c of the joint 10, the joint portion 8 becomes stronger.

13 to 16 show another embodiment of the joining method. In the first step, as shown in FIG. 13, the tip 4c of the left end 4a of the upper member 4 is moved to the left end 4a.
A stepwise outward process is performed so that the angle is about 90 degrees with respect to a, and the tip 5 of the left end 5a of the lower member 5 is formed.
Similarly, c is also processed and formed so that the angle is approximately 90 degrees outward. In the second step, as shown in FIG. 14, a part of the tip 4c of the left end portion 4a of the upper member 4 is cut so that the tip 4c hangs down, and the tip 5c of the left end portion 5a of the lower member 5 is also formed. Bend slightly downward. In the third step, as shown in FIG. 15, the left end portion 4 tip 4c of the upper member 4 and the left end portion 5 of the lower member 5
The tip 5c of a is aligned with the tip 4c of the upper member 4 and the tip 5c of the left end 5a of the lower member. In the fourth step, as shown in FIG. 16, the tip 4c of the left end 4 of the upper member 4 completely joins the tip 5c of the left end 5a of the lower member 5 and crimps them into a curl shape to join them.

Although the method of joining the left joint portions 2, 8 and 11 has been mainly described, the right joint portions 3, 9 and 12 are joined in the same manner. Further, the corner portion 1a and the fitting portions 1b and 1c
All of the joining portions 2, 3, 8, 9, 11, 12 may be joined by the same joining method. Further, the left and right joint portions 3 and 4 of the corner portion 1a are joined by the same joining method to form the fitting portions 1b and 1c.
May be joined by a method according to another embodiment.

FIG. 17 is a partial vertical sectional view showing another embodiment of the joining step of the joining portion, and the joining portion 8 shown in FIG.
When a part of the tip 7c of the upper and lower members 7 and 10 of the upper and lower members 7 and 10 is pressed from the outside by the outer die press 13 from the inside by the inner press die 14 from the inside and the outside at the same time, the pressing groove 7 is formed in the tip 7c.
e is formed, and the joint portion 8 becomes stronger.

[0013]

Since the present invention has the structure as described above, the following effects can be obtained. First, the effect is obtained that the bonded portion does not peel off even after long-term use. Secondly, there is an effect that it can be manufactured extremely easily and at low cost.

[Brief description of drawings]

FIG. 1 is a front view of an elbow for an air conditioning duct according to the present invention.

FIG. 2 is a vertical sectional view taken along the line AA in FIG.

3 is a vertical cross-sectional view taken along the line BB and the line CC of FIG.

FIG. 4 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 5 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 6 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 7 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 8 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 9 is a partial vertical cross-sectional view showing a joining step of joining portions.

FIG. 10 is a partial vertical cross-sectional view showing a joining step of fitting portions.

FIG. 11 is a partial vertical cross-sectional view showing another embodiment of the joining step of the joining portion.

FIG. 12 is a vertical cross-sectional view showing another embodiment of the process of joining the fitting portions.

FIG. 13 is a partial vertical cross-sectional view showing another embodiment of the joining step of joining portions. FIG. 14 is a partial vertical cross-sectional view showing another embodiment of the joining step of joining portions.

FIG. 15 is a partial vertical cross-sectional view showing another embodiment of the joining step of the joining portion.

FIG. 16 is a partial vertical cross-sectional view showing the steps of the joining method for joining portions.

FIG. 17 is a partial vertical cross-sectional view showing another example of the joining step of the joining portion.

[Explanation of symbols]

 1 Elbow 2 Left Joined Part 3 Right Joined Part 4 Upper Member 4a Left End 4b Right End 4c Tip 4d Tip 4e Pressing Groove 4f Protrusion 5 Lower Member 5a Left End 5b Right End 5c Tip 5d Tip 5e Pressing Groove 5f Projection 6 Depth 7 Upper End 7a Left 7b Right end portion 7c Tip 7d Tip 8 Left joining portion 9 Right joining portion 10 Lower member 10a Left end portion 10b Right end portion 10c Tip 10d Tip 10e Pressing groove 10f Protrusion 11 Left joining portion 12 Right joining portion 13 Outer press die 14 Inner press die 14 Type

Claims (4)

[Claims] 1. A corner of an elbow for an air conditioning duct.
An elbow for an air conditioning duct, characterized in that the left and right joints of the insertion portion and the fitting portion are caulked so that the tips of the upper and lower members are aligned and the tip of the upper member wraps around the tip of the lower member. 2. A corner of an elbow for an air conditioning duct.
Air-conditioning, characterized in that the left and right joints of the insertion portion and the fitting portion are crimped so that the tips of the upper and lower members are aligned and the tip of the upper member is wrapped around the tip of the lower member, and then the joints are pressed from the outside. Elbow for duct. 3. The elbow for an air-conditioning duct according to claim 1, wherein the left and right joints of each fitting portion are flush with each other. 4. A corner in an elbow for an air conditioning duct.
An elbow for an air-conditioning duct, characterized in that the left and right joints of the insertion portion and the fitting portion are joined together by the tips of the upper and lower members, and the tip of the lower member is wound by the tip of the upper member and crimped in a curl shape.