JPH0536479Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotor blade for a model helicopter, that is, a rotary wing.

Summary of the invention The present invention relates to a rotor blade for a model helicopter manufactured by vertically joining an upper side shell and a lower side shell, and in particular, the upper side shell and the lower side shell are connected at their leading edge sides. In this state, the lower side shell body is molded integrally with synthetic resin, and the lower side shell body is formed into two parts on the leading edge side.
By folding it in half and joining them together to make the rotor blade, the upper side shell and the lower side shell can be molded simultaneously in a single operation, improving the efficiency of the shell molding process. At the same time, it is possible to prevent burrs from forming on the leading edge sides of the upper side shell and the lower side shell, thereby preventing deterioration in rotor blade performance caused by burrs.

BACKGROUND ART Japanese Utility Model Application Publication No. 113099/1983 is known as a rotor blade for a model helicopter manufactured by vertically joining an upper side shell and a lower side shell.

This means that the upper side shell 102 and the lower side shell 103 of the blade 101 are
R and P are molded, and these are integrally joined to each other on the leading edge side and the trailing edge side, and a non-metallic material is placed inside the joint on the leading edge side, extending in the length direction of the blade along this joint. The weight rod 104 is integrally hardened with resin and attached.

Note that 105 and 106 are glass fiber sheets constituting F.R.P and resin with which the glass fiber sheet 105 is impregnated.

Problems to be Solved by the Invention By the way, in the above-mentioned conventional blade 101, the upper side shell 102 and the lower side shell 103 are separately molded, and the leading and trailing edges of the upper and lower side shells 102 and 103 are F-shaped. Since the resin 106 constituting R and P was configured to be welded and joined together, there were problems as described below.

(1) Since the upper side shell 102 and the lower side shell 103 are formed separately, the manufacturing efficiency of the shell is poor.

(2) When the upper side shell 102 and the lower side shell 103 are joined, the resin 106 protrudes from the leading edge side and the trailing edge side of the blade, causing burrs. Especially, burrs generated on the leading edge side of the blade affect the performance of the blade. have a negative impact on

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a blade that can improve the production efficiency of the shell and the performance of the blade.

Means for solving the problem: In a rotor blade for a model helicopter, which consists of an upper shell and a lower shell and is formed by overlapping and joining the lower shell to the upper shell, the leading edge sides of the upper shell and the lower shell are connected to each other by a bendable connecting portion and molded integrally from synthetic resin.

The blade is formed by folding the upper and lower shells, which are connected to each other, in half at the connecting portion and then overlapping and joining the upper and lower shells. Therefore, no burrs are generated on the front edges of the upper and lower shells (burrs are generated on the periphery of the resin molded product, i.e., the parting line of the mold), preventing deterioration of the blade performance due to burrs, and since the upper and lower shells can be molded simultaneously, the efficiency of the molding work is improved.

EXAMPLE Next, the present invention will be explained with reference to FIGS. As shown in FIG. A first convex portion 5 for coupling provided at approximately the center in the width direction of the body 2 is connected to a first concave portion for coupling 6 provided at approximately the center in the width direction of the lower side shell body 3. At the same time, as shown in FIG. 4, a second convex portion 7 for coupling provided near the rear edge side of the upper side shell body 2 is provided near the rear edge side of the lower side shell body 3. second recess 8 for
... It is formed by fitting into 8. 9
... 9 is a reinforcing rib provided on the upper and lower side shells 2 and 3, respectively; 10 and 11 are long grooves with a semicircular cross section provided on the front edge sides of the upper and lower side shells 2 and 3. These semicircular long grooves 10 and 11 are located on the top,
When the lower side shells 2 and 3 are overlapped and joined, a long hole 12 with a circular cross section is formed, and a round rod-shaped weight 13 can be accommodated therein.

As shown in FIG. 5, the upper and lower side shells 2 and 3 are integrally molded from synthetic resin with their front edges connected by a bendable connecting portion 14.

The connecting portion 14 is formed by utilizing a thin arc-shaped portion formed at the peripheral edge of the semicircular long grooves 10 and 11.

After inserting a round rod-shaped weight 13 into either one of the long grooves 10, 11, both the lower peripheral edge of the upper side shell 2 and the upper peripheral edge of the lower side shell 3 are glued to one of them. 4 is applied, the upper and lower side shells 2 and 3 are folded in half at the connecting portion 14, and the upper surface of the lower side shell 3 is superimposed on the lower surface of the upper side shell 2 to form the first convexity. The portions 5...5 and the first recesses 6...6, and the second protrusions 7...7 and the second recesses 8...8 are fitted into each other, and the adhesive 4 is applied to the upper and lower side shell bodies. 2 and 3 are integrally combined.

The rotor blade 1 of the embodiment has the above-mentioned structure, and has the adhesive effect of the adhesive 4 and the first convex portion 5.
...5 and the first recess 6...6, and the second convex part 7...7 and the second recess 8...8 make the upper and lower side shells 2 and 3 strong. At the same time, the first convex portions 5...5 and the second concave portions 6...6 are joined together, and the second convex portions 7...7 and the second
Rib 11...1 for coupling and auxiliary use of recessed portion 8...8
As a result, the upper and lower side shells 2 and 3 are prevented from being deformed by wind pressure or the like.

Furthermore, the adhesive 4 applied to the peripheral edges of the upper and lower side shells 2 and 3 is pressed when joining the upper and lower side shells 2 and 3, and is pushed out toward the inner and outer peripheries of the joint surfaces. The leading edge sides of the upper and lower side shells 2 and 3 are connected by a connecting part 14, which blocks the flow of the adhesive 4, so that the adhesive 4 is connected to the upper and lower side shells 2 and 3. It is possible to reliably prevent the adhesive from flowing out to the front edge side and causing a so-called burr-like adhesive pool or adhesive dripping.

Effects of the Invention As explained above, the rotor blade of the present invention has the upper side shell body and the lower side shell body integrally molded from synthetic resin with their leading edges connected to each other, so that it has the following effects. .

(1) Since the upper side shell and the lower side shell can be molded simultaneously in a single operation, the efficiency of molding the shell can be improved, and since the upper and lower side shells are integrated, The handling, joining work, etc. will also be convenient.

(2) Since the leading edge sides of the upper side shell and the lower side shell are connected to each other during molding, it is possible to prevent burrs from forming on the leading edge side during molding, thereby preventing deterioration of blade performance due to burrs. can.

[Brief explanation of the drawing]

Figure 1 is a plan view of the rotor blade of the present invention.
Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a cross-sectional view of Figure 2.
FIG. 4 is a cross-sectional view taken along the - line in FIG. 2, FIG. 5 is a developed view of the rotor blade, and FIG. 6 is a cross-sectional view of a conventional example. 1...Rotor blade, 2...Upper side shell,
3...Lower surface side shell body, 14...Connection part.

Claims (1)

[Claims for Utility Model Registration] Consisting of an upper side shell and a lower side shell joined to the bottom surface of the upper side shell, the upper side shell and the lower side shell are bendably connected. A rotor blade for a model helicopter characterized by being integrally molded from synthetic resin with parts connected to each other.