JPH0236559Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field The present invention relates to a support structure for a glide ski to be attached to a model airplane, and more specifically, the present invention relates to a support structure for a glide ski to be attached to a model airplane. The present invention relates to a support structure for a sliding ski, in which a sliding ski is connected and supported in place of a land wheel to an axle extending substantially horizontally at the tip of a leg to which a wheel is attached.

(b) Prior Art Generally, model airplanes have land wheels, and these wheels are used to take off and land. However, when taking off and landing on a soft, uneven runway such as snow, sand, or mud, these wheels do not provide the desired glide. For this reason, sliding skis (here, sleds and floats are also included) have traditionally been used instead of wheels.

As mentioned above, sliding skis are suitable for sliding on snowy or sandy surfaces, but when the ground surface is flat and firm, it is advantageous to use wheels, and the sliding skis can be removed. It is desirable that the wheels can be easily replaced. In addition, when using skis for skiing, the skis are elastic in the front and back to reduce the snow resistance generated at the rear end of the ski during takeoff skiing, and to prevent damage to the ski due to impact during landing. It is desirable to have a support structure that can swing freely.

A conventional rocking support structure for sliding skis includes, for example, supporting the middle part of a sliding ski on the axle of a land wheel so that it can swing back and forth, and the front and rear parts are supported by coil springs. There was something that I supported.

However, conventional support structures configured in this way require special processing, such as providing members on both the legs (or fuselage or wings) and skis to hang the two coil springs. Furthermore, adjusting the angle at which the skis are attached to the aircraft body is extremely difficult because it involves adjusting the tension of the two coil springs, and furthermore, it is not easy to replace the sliding skis with the wheels.

(c) Purpose The present invention has been developed in view of the above circumstances, and has all the advantages of the conventional swingable ski support structure described above, while also eliminating the need for modifications to the main body or legs of the model airplane. To provide a ski support structure for a model airplane in which it is extremely easy to attach and remove sliding skis in place of land wheels, and in which the attachment angle of the sliding skis to the main body of the model airplane can be easily adjusted. The purpose is

(d) Configuration In order to achieve the above-mentioned purpose, the present invention has an axle that extends approximately horizontally from the tip of the leg whose base end is attached to the lower part of the main body of the model airplane, and is equipped with a planing wheel instead of a land wheel. A ski support structure for connecting and supporting skis includes an elastic support member in which a U-shaped, inverted U-shaped, or annular attachment part is bent on a part of a single elastic wire, and an intermediate part. a sliding ski in which a through hole through which the axle is inserted is bored in a direction perpendicular to the longitudinal direction, and an end of the elastic support member is in contact with or engaged with the upper surface of the sliding ski. The vehicle is characterized in that it includes a screw coupling means for clamping and fixing the mounting portion to the axle shaft portion.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view showing the structure of a first embodiment of the support structure for a sliding ski according to the present invention, and FIG.
is an exploded perspective view showing the configuration of the same embodiment;
FIG. 2b is a partial cross-sectional view showing a state in which a part of the screw coupling member is attached to the axle portion of the same embodiment.

In the figure, reference numeral 1 denotes a linear leg whose base end (upper end) is fixed to the main body or wing of the model airplane, and whose lower part is bent approximately horizontally into an L-shape, and whose axle part 1
a is formed. Usually, a land wheel 2 as shown in FIG. 8a is loosely fitted onto this axle portion 1a, and a wheel stopper 3 is fitted from the outside (end side) and fixed with a set screw 4. The axial position of the land wheel 2 is regulated by the wheel stopper 3. Reference numeral 5 designates a ski for skiing, and a mounting portion 5b is integrally formed in the intermediate portion thereof, in which a shaft hole (through hole) 5a for inserting the axle shaft portion 1a is bored in a direction perpendicular to the longitudinal direction. or fixed together. Reference numeral 6 denotes a coupling fitting as a screw coupling member, and the axle shaft portion 1a is attached to the axis center of the coupling fitting.
A shaft hole 6a is drilled through which the shaft is inserted, a male threaded portion 6b is formed on the outer periphery of one half, a stepped portion 6c is formed with a large diameter on the other half, and a side hole 6c is formed on the other half. A screw hole 6d reaching the shaft hole 6a is drilled from the periphery, and one notch groove 6e into which the leg 1 is fitted is formed at the end of the other half. 7 is a set screw screwed into the screw hole 6d of the coupling fitting 6. 8
This is a grooved washer which is formed into an annular shape, has a vertically bent peripheral edge, and has cutout grooves 8a and 8b formed at two locations on the peripheral edge. 9 is a flat washer that can be substituted for the grooved washer 8. Reference numeral 10 denotes an elastic support member made by bending a single steel wire, and in this example, the middle part is bent into a U-shape and is provided with a mounting part 10a that is fitted into the male threaded part 6b of the coupling fitting 6. The legs are wide open on both sides in the longitudinal direction (the longitudinal direction of the airplane body or the glide ski 5), and both ends are bent approximately horizontally in the left-right direction to form the glide ski 5.
Support portions 10b and 10c are provided to press and support the front and rear portions of the vehicle with a predetermined biasing force.
Moreover, between the attachment part 10a and each support part 10b, 10c, in order to particularly expand the elastic limit, a coil part 10d, each formed by winding one to a plurality of times, is provided.
10e is provided. 11 is a washer, and 12 is a nut that constitutes a screw connection member together with the coupling fitting 6, and is screwed into the male threaded portion 6b. 13 is a ski stopper having a shaft hole 13a to be fitted into the axle portion 1a, and a screw hole 3b extending from the side circumference to the shaft hole 13a, and 14 is a set screw screwed into the screw hole 13b.

In addition, the ski stopper 13 and set screw 14
It is also possible to use the existing wheel stopper 3 and set screw 4 shown in FIG. 8 instead.

The ski support structure according to this embodiment made of such members is assembled in the following manner.

First, loosen the set screw 4 of the wheel stopper 3 fixed to the axle portion 1a of the leg 1 shown in FIG. Remove. Then, the shaft hole 6a of the coupling fitting 6 is inserted into the axle portion 1a. As shown in FIG. 2b, this coupling fitting 6 is fixed to the axle shaft portion 1a with a set screw 7 with the leg 1 fitted into a notch 6e formed in the other side half (head). Ru. Next, the grooved washer 8 (or flat washer 9) is attached to the male threaded portion 6b of the coupling fitting 6, and the elastic support member 1
After sequentially fitting the mounting part 10a of 0 and the washer 11 and adjusting the mounting angle of the elastic support member 10 to the main body, by screwing and tightening the nut 12,
This elastic support member 10 is fixed to the axle portion 1a. Next, the axle portion 1a protruding from the coupling fitting 6
The shaft hole 5a of the mounting portion 5b formed on the sliding ski 5 is aligned with the shaft hole 5a of the mounting portion 5b formed on the ski 5 to fit them together, and a ski stopper 13 (or wheel stopper 3, hereinafter referred to as the same), and tighten the setscrew 14 (or setscrew 4; the same applies hereinafter) to attach the ski stopper 13 to the axle part 1.
By fixing at point a, the assembly of the ski support structure is completed.

FIG. 1 shows a perspective view of the ski support structure with the sliding skis 5 attached to the legs 1 of the model airplane in this manner.

The overall configuration of the model airplane is shown in Figures 9a and 9b. Among them, the model airplane 15 shown in Figure 9a is a land-type aircraft in order to take off and land on a flat and solid runway. Wheel 2 is attached.
That is, it has two legs 1, 1 whose base ends are attached to the lower part of the main body near the main wings, and one leg 1 whose base end is attached to the lower part of the main body near the nose 16,
A land wheel 2 is loosely fitted into an axle shaft portion extending substantially horizontally at the tip of each leg 1 .

Further, when taking off or landing on a soft and uneven runway such as snow, sand, mud, etc., the skis are replaced with sliding skis 5, as shown in FIG. 9b.

According to the first embodiment configured as described above, the following numerous advantages can be obtained.

That is, first, the runway skis 5 can be attached and detached from the model airplane 15 extremely easily using only a screwdriver or a hexagonal wrench, and the land wheels 2 can be attached or detached from the model airplane 15 using only a screwdriver or a hex wrench. and the sliding skis 5 can be exchanged quickly. Second, the sliding ski 5 is attached to the axle portion 1a to which the land wheel 2 is attached.
Since the ski support structure is simply fitted onto this axle portion 1a or connected with a set screw,
There is no need to make any modifications to the main body side or the legs of the model airplane, and it can be attached to any model airplane as long as it has an axle part 1a, making it extremely versatile. I'm here. Third
Furthermore, the attachment angle of the ski 5 to the airplane body can be freely set by slightly loosening the nut 12. That is, by slightly loosening the nut 12, the supporting parts 10b and 10c of the elastic supporting member 10 are loosened.
The mounting angle of the sliding ski 5 can be adjusted by a simple operation of tightening the nut 12 after setting the sliding ski 5 supported at a predetermined angle with respect to the aircraft body. Fourthly, the axle portion 1a is loosely fitted into the shaft hole 5a in the intermediate portion of the sliding ski 5 so as to be able to swing back and forth, and the movement in the swinging direction is elastically supported by the elastic support member 10. This configuration reduces the snow surface resistance that occurs at the rear end of the skis during takeoff runs, and also prevents damage to the skis or adverse effects on the airplane body even if the model airplane touches down at a steep angle. It can be effectively prevented. Even if the elastic support member should be excessively deformed beyond its elastic limit or broken during landing, it can be easily replaced with another elastic support member as described above.

FIG. 3 is a perspective view showing the structure of a second embodiment of the present invention, and FIG. 4 is an exploded perspective view showing the structure of the second embodiment.

In this figure, members common to those in FIGS. 1 and 2 a and b are given the same reference numerals.

This second embodiment differs from the configuration of the first embodiment described above in the following points.

That is, the leg 17 is not linear but plate-shaped, the axle portion 18 is constructed separately from the leg 17, and a flange portion 18a is provided in the middle portion near one end, and a flange portion 18a is provided at the end portion on the side of the flange portion 18a. is formed with a male threaded portion (not shown in the figure), and a planar sliding portion 18b is provided in the middle portion near the other end. It is configured such that it can be detachably attached to the leg 17 by inserting the male threaded part from one side into the through hole (not shown in the figure) and screwing and tightening the nut 19 to the male threaded part from the other side. 2a, on the coupling fitting 20.
Unlike the first embodiment, the cutout groove 6e as shown in FIG. Coupling fitting 20 - Grooved washer 8 -
The difference is that the elastic support member 10, washer 11, and nut 12 are assembled in this order.

In the second embodiment configured in this manner, substantially the same effects as in the first embodiment can be obtained.

FIGS. 5a and 5b are a perspective view showing the structure of the third embodiment of the present invention in an assembled state and an exploded perspective view showing the structure in an exploded state.

This third embodiment is different from the first and second embodiments described above in the shapes of the elastic support member, the grooved washer, and the sliding ski. To explain this in more detail, the elastic support member 21 in this third embodiment is provided with an annularly curved attachment portion 21a at one end instead of at the middle portion of the embodiment described above. This is a fundamentally different point. For this reason, the grooved washer 22 that serves as a rotation stopper for the elastic support member 21 has only one cutout groove 22a formed therein, and the elastic support member 21 is designed to prevent the sliding ski 5 from rotating. Since there is no part to support the front part and only the rear part is supported, the difference is that the support part 21b is hooked to a hook part 5c provided on the upper surface of the rear part of the ski 5.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist thereof.

For example, as the shape of the elastic support member 10, the first
Like the one used in the embodiment, the middle part (attachment part 10a) of one wire rod is bent into a U-shape, and both sides of the wire are opened at a sufficiently large angle to form the attachment part 1.
Coil portions 10d and 10e are bent between 0a and support portions 10b and 10c, respectively.
The support portions 10b and 10c are not limited to those in which the support portions 10b and 10c are bent in a substantially horizontal direction (Fig. 6a), but also those in which the support portions 10b and 10c are bent into an annular shape as shown in Fig. 6b, and Fig. 6 As shown in Fig. 6c, the coil portion 10d is provided only on one side (the side located in front of the ski), as shown in Fig. 6d, there is no coil portion at all, as shown in Fig. 6e, The elastic supporting members 10 shown in FIG. 6a may be arranged in parallel. In particular, what is shown in Figure 6e is
Since it has a large elastic support force, it is suitable as an elastic support member for heavy airplanes.

Further, the shape of the attachment portion 10a of the elastic support member 6 is not limited to the U-shape as shown in FIG.
Inverted U-shape as shown in Figure 7b or Figure 7c
There is no problem in forming it in an annular shape as shown in the figure.

Further, the axle portion provided at the end of the leg can also be modified in various ways. For example, as shown in FIG. In addition, a male threaded portion 23b may be provided for attaching the nut 19 to the leg 17 by threading it through the through hole 17a formed in the leg 17. When configured in this way, the coupling fittings 6 (20 in the second embodiment) and set screws 7 used in the first embodiment can be omitted, and the axle portion 23 having a different diameter can be omitted. can be exchanged for.

In addition, when the leg 1 is made of wire, Fig. 10b
As shown in FIG. 2, a large-diameter portion 24a is provided at the end of the ski axle portion 24, and adjacent to this, a male thread portion 24b for attaching the sliding ski 5 is integrally provided, and further, the large-diameter portion 24a A leg insertion hole 24c penetrating from one side periphery to the opposite side periphery and a screw hole 24d into which the set screw 25 is screwed may be bored.

In the case where the axle is detachably attached to the leg in this way, the axle includes a ski axle 24 as shown in FIG. 11a and a wheel axle 26 as shown in FIG. 11b. If both are prepared, when replacing the wheels and skis, it is only necessary to replace the entire axle, making it possible to replace both more quickly and conveniently. Of course, it is also possible to use this wheel axle 26 as it is and attach the sliding skis 5 using the method of the second embodiment (FIGS. 3 and 4).

Further, although not shown in the drawings, the grooved washer 8 and the coupling fitting 6 (or 20), the washer 11 and the nut 12, etc. can be formed integrally as appropriate.

Furthermore, the present invention can also be applied as a support structure for a float of a model airplane that takes off and lands from water instead of skis.

(e) Effects As is clear from the detailed description above, according to the present invention, there is no need to make any modifications to the main body or the landing gear of the model airplane, and it is possible to attach and remove skis for running instead of wheels for land use. In addition, it is possible to easily adjust the attachment angle of the skis to the main body of the model airplane, and it is also possible to easily adjust the angle at which the skis are attached to the main body of the model airplane. This reduces the contact resistance of the model airplane and effectively prevents damage to the skis when the model airplane touches down at a steep angle. It is possible to provide a ski support structure for a model airplane in which the elastic support member can be easily replaced even if it is deformed or broken.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the structure of the first embodiment of the present invention in an assembled state, Fig. 2a is an exploded perspective view showing the structure of the same embodiment in an exploded state, and Fig. 2b
3 is a partial cross-sectional view showing a state in which a part of the screw coupling member is attached to the axle of the same embodiment, and FIG. 3 is a perspective view showing the structure of the second embodiment of the present invention in an assembled state. FIG. 4 is an exploded perspective view showing the structure of the third embodiment in an exploded state, FIG. 5a is a perspective view showing the structure of the third embodiment in an assembled state, and FIG. FIGS. 6 a to 6 e are perspective views showing different embodiments of the elastic support member, which is one component of the present invention, and FIGS. 7 a to c are exploded perspective views showing the configuration of the example. Partial views showing examples in which the shapes of the mounting portions that are part of the elastic support member are different,
FIG. 8a is an exploded perspective view showing an example of a conventional model airplane wheel support structure, and FIG. 8b is an exploded perspective view showing an example of a conventional model airplane wheel support structure.
Of the conventional wheel support structure, FIG. 9a is a perspective view showing the configuration of the legs and axle, FIG. 9a is a perspective view showing the overall configuration of a model airplane with land wheels attached, and FIG. 9b is FIGS. 10a and 10b are perspective views showing the overall configuration of a model airplane with sliding skis attached using the sliding ski support structure according to the present invention,
FIG. 11a and FIG. 10b are exploded perspective views respectively showing the configurations of two different embodiments in which the function of the screw coupling member according to the present invention is combined with the axle part that can be separated from the leg. Cross-sectional view showing the state in which the ski axle shown in Figure 1 is attached to the leg, No. 11
FIG. b is a sectional view showing a state in which the wheel axle is attached to the leg. 1, 17... Legs, 1a, 18, 23, 24, 2
6... Axle portion, 2... Land wheel, 3... Wheel stopper, 4, 7, 14, 25... Set screw, 5...
Sliding skis, 6, 20... Connecting fittings, 8, 9,
11, 22... Washer, 10, 21... Elastic support member, 10a, 21a... Mounting part, 12, 19...
Natsu, 13...Skistoppa, 15...Model airplane, 16...Near the nose.

Claims (1)

[Scope of utility model registration request] In a ski support structure for connecting and supporting sliding skis instead of land wheels to an axle extending substantially horizontally to the tips of legs whose base ends are attached to the lower part of the main body (including wings) of a model airplane, An elastic support member in which a U-shaped, inverted U-shaped, or annular mounting portion is bent on a part of a single elastic wire, and a through hole through which the axle shaft portion is inserted is provided in the intermediate portion. The mounting portion is clamped and fixed to the axle portion with the end of the elastic support member abutting or engaging the upper surface of the sliding ski that is perforated in a direction perpendicular to the direction of the sliding ski. A ski support structure for a model airplane, characterized by comprising a screw connection means.