JPH11290558A - Thin plate type light spinner and thin plate type back plate used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a spinner light and its manufacture process simple by equipping plural fitting holes corresponding to fitting protruding parts of a spinner cone for fitting onto a thin plate with a thickness having irreducible minimum rigidity and fitting the spinner cone into a back plate. SOLUTION: Plural fitting holes 5a corresponding to fitting protruding parts 2a are equipped on a thin plate with required irreducible minimum rigidity for the thin plate as a back plate to form a thin plate type back plate 5a. A shaft hole 7a is bored in the central part of the thin plate type back plate 71 and about eight circular thinning holes 8a are formed in between the shaft hole 7a and the fitting holes 6a. The fitting protruding parts 2a re fit into the fitting holes 6a to attach the spinner cone 1a to the back plate 5a. By this constitution, the manufacture process can be simplified and the weight of the spinner can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a spinner mounted together with a propeller on an output shaft of a power engine or a motor for the purpose of reducing air resistance at the nose of a model airplane propelled by a propeller.

[0002]

2. Description of the Related Art The structure of a conventional spinner is shown in FIGS.
As shown in FIG. 1, a ring-shaped fitting groove 6j is provided on the back plate 5j to prevent the spinner cone 1j from spreading in the outer circumferential direction due to centrifugal force due to rotation of the spinner. The fitting 2j of the cone 1j is fitted to the fitting, and the back pluto is manufactured by resin molding of plastic or the like or cutting of light alloy such as aluminum by lathe from the structure.

[0003]

The spinner mounted on a model airplane is required to be lightweight and well-balanced in rotation, but the back plate of the conventional resin molded product is deformed due to its low rigidity. Because of this, there is a problem that the rotation axis of the spinner is displaced and the balance of rotation is deteriorated, and since it is necessary to provide a ring-shaped fitting groove for fitting with the fitting projection of the spinner cone,
The thickness of the back plate must be set to about twice the depth of the fitting groove, and there is a problem that it is difficult to reduce the weight of the back plate.

A conventional back plate of a cut product such as aluminum has sufficient rigidity and good rotation balance, but has a ring-shaped fitting groove for fitting with a fitting projection of a spinner cone. Because of the necessity, the thickness must be greater than the actually required rigidity, and as a result, there is a problem that an unnecessary increase in weight is caused.

[0005] As a means of reducing the weight of a back plate of a cut product such as aluminum, there is a method of punching a hole with a drill or the like. However, the number of manufacturing processes is increased and a relatively high cost of a cut product of aluminum or the like is required. However, there is a problem that the disadvantage of the above is further promoted.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a thin plate having a minimum rigidity required for a back plate and a thin plate having a spinner cone. By providing a plurality of fitting holes of the shape,
The structure was such that the spinner cone and the back plate were fitted together, and a hole was provided in the back plate. As a result, it is possible to reduce the weight of the spinner and obtain a good rotation balance.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a spinner cone and a thin plate by providing a plurality of fitting projections on a spinner cone and arranging a fitting hole having a shape corresponding to the fitting projection on a thin plate-type back plate. A mold back plate is fitted to prevent the spinner cone from spreading in the outer peripheral direction due to centrifugal force.

As the spinner cone, a resin molded product such as plastic, a glass fiber molded product, a carbon fiber molded product, or the like is used.

On the back of the spinner cone, a plurality of fitting projections for fitting to a thin plate-type back plate are provided.

A screw hole for fixing the spinner cone is provided at the center of the tip of the spinner cone, and two notches corresponding to the shape of the propeller are provided at the rear side surface.

The thin-type back plate is a disk-shaped one having a size corresponding to the rear diameter of the spinner cone, and is made of, for example, aluminum, duralumin, glass fiber, carbon fiber, etc., which is as rigid and lightweight as possible. It is good to use a board.

The thin back plate is provided with a plurality of fitting holes having a shape corresponding to the fitting projections of the spinner cone. The shape of the fitting hole does not necessarily have to be the same as the shape of the fitting projection, and any shape may be used as long as the spinner cone and the thin back plate are fitted so that the rotation axes thereof coincide. Also, the number of fitting holes does not need to be the same as the number of fitting projections, and it is sufficient that the fitting holes are fitted so that the rotation axes of the spinner cone and the thin plate back plate coincide with each other.

In the center of the thin-plate type back plate, there is provided a circular shaft hole for receiving a shaft portion of a propeller coupling attached to an output shaft of a power engine or an output shaft of a motor.

A plurality of lightening holes are provided between the fitting hole and the shaft hole of the thin-plate type back plate to reduce the weight. The number of the lightening holes is determined by the shape and the size of the lightening holes, and the shape and the size may be any shape such as a circle or a sector as long as the strength and rigidity of the thin plate back plate are not impaired.

[0015]

First Embodiment An embodiment will be described with reference to the accompanying drawings. FIGS. 1 and 2 show a fitting state of the spinner cone 1a and the thin plate-type back plate 5a. The fitting protrusion 2a of the spinner cone 1a is inserted and fitted into a fitting hole 6a provided in the thin plate-type back plate 5a.

A screw hole 3a for fixing a spinner cone is provided at the tip of the spinner cone 1a.

As shown in FIG. 3, the spinner cone 1a
Notch 4a on rear side corresponding to propeller shape
Are provided at two places.

As shown in FIGS. 2 and 3, four projections 2a are provided on the back of the spinner cone 1a.

As shown in FIGS. 2 and 4, the fitting projection 2a
Are arranged on the thin plate-type back plate 5a. A shaft hole 7a is provided at the center of the thin plate back plate 5a, and eight circular lightening holes 8a are provided between the shaft hole 7a and the fitting hole 6a.

FIG. 5 shows a state where the apparatus is actually mounted on a model airplane and used. The mounting is performed in the following procedure.

First, after the thin back plate 5a is inserted into the propeller coupling 10a attached to the output shaft 9a of the motor, the propeller 11a is further inserted.

Next, through a propeller washer 12a,
The propeller 11a and the thin plate back plate 5a are tightened and fixed by the propeller nut 14a to which the set screw 13a is screwed and fixed in advance.

The fitting projection 2a of the spinner cone 1a
After the spinner cone 1a is fitted so as to fit into the fitting hole 6a of the thin-plate type back plate 5a, the spinner cone 1a is fixed with the screw 15a for fixing the spinner cone.

[0024]

Second Embodiment FIGS. 6 and 7 show an embodiment in which the shape of the fitting projection 2b of the spinner cone 1b is cylindrical.

In the embodiment, fourteen fitting projections 2b of the spinner cone 1b are provided, but correspondingly eighteen fitting holes 6b are arranged in the thin plate back plate 5b. It is sufficient that the number of the fitting holes 6b is the same at the position corresponding to the fitting projection 2b. However, as in the embodiment, the fitting holes 6b are formed on the same circumference at the same pitch as the fitting projection 2b. By arranging them at intervals, the number of combinations of fitting between the fitting projections 2b and the fitting holes 6b increases, and the degree of freedom when fitting the spinner cone 1b and the thin plate-type back plate 5b is increased, so that it is easy to use.

[0026]

Third Embodiment FIGS. 8 and 9 show a thin back plate 5c.
This is an embodiment in which the side surface is not exposed.

[0027]

The present invention is embodied in the form described above, and has the following effects.

Since the thickness of the back plate can be made thinner than in the prior art, weight reduction can be achieved.

The rigidity required for the back plate is ensured in the thin plate type back plate, so that the rotation balance is good.

Since it is not necessary to form grooves on the back plate as in the prior art, and it is possible to manufacture by pressing, the production cost can be kept low.

Since it is possible to manufacture by press working, it is possible to simultaneously form a lightening hole to reduce the weight in one step, so that even if the lightening hole is provided, the production cost can be kept low.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a thin-plate lightweight spinner.

FIG. 2 is a rear view showing the first embodiment of the thin plate type lightweight spinner.

FIG. 3 is a rear view showing the first embodiment of the spinner cone.

FIG. 4 is a front view showing a first embodiment of a thin back plate.

FIG. 5 is a longitudinal sectional view showing a state in which the thin-plate lightweight spinner of the first embodiment is actually used by being mounted on a model airplane.

FIG. 6 is a rear view showing a second embodiment of the spinner cone.

FIG. 7 is a front view showing a second embodiment of the thin plate type back plate.

FIG. 8 is a longitudinal sectional view showing a third embodiment of a thin plate-type lightweight spinner.

FIG. 9 is a rear view showing a third embodiment of the thin plate type lightweight spinner.

FIG. 10 is a longitudinal sectional view of a conventional spinner.

FIG. 11 is a front view of a conventional back plate.

[Explanation of symbols]

1a, 1b, 1c Spinner cone 2a, 2b, 2c Protrusion for fitting 3a, 3b, 3c Screw hole for fixing spinner cone 4a, 4b, 4c Notch corresponding to the shape of propeller 5a, 5b, 5c Thin plate back plate 6a, 6b, 6c Fitting hole 7a, 7b, 7c Shaft hole 8a, 8b, 8c Lightening hole 9a Motor output shaft 10a Propeller coupling 11a Propeller 12a Propeller washer 13a Set screw 14a Propeller nut 15a Spinner cone fixing screw 1j Prior art spinner cone 2j Prior art fitting projection 5j Prior art back plate 6j Prior art fitting groove

Claims (3)

[Claims] 1. A thin-plate-type lightweight spinner characterized in that a fitting projection of a spinner cone is fitted into a plurality of fitting holes provided in a thin-plate type back plate. 2. A thin back plate having a plurality of fitting holes having a shape corresponding to the fitting projections of the spinner cone. 3. The thin plate type back plate according to claim 2, having a plurality of lightening holes for weight reduction.