DESC:Technical Field of Invention

[0001] The present invention relates to method of constructing a pattern for spherical screens.

Background of the Invention

[0002] It is known that there is an increasing trend towards the use of large spherical screens in flight simulation and other like uses. Flight simulation is the generalized term given to the situation where pilots are given on-the-ground training in how to fly aircraft. Typically, the flight simulator pilot is seated in the middle of a large, geodesic dome structure. An image projection system is used to present a highly realistic visual background environment for the flight simulator pilot.

[0003] Manufacturing of such large spherical screens are made using patterns or moulds of plywood or metal or a fibrous material. These approaches are expensive and have the disadvantages of deformation of moulds, time consumption in precise alignment of more number of screen segments and misalignment of more number of screen segments.

[0004] It is therefore desirable to have a pattern for making large spherical screens that would overcome the shortcomings or at least substantially ameliorate the shortcomings and disadvantages of the conventional approaches.

Brief Summary of the Invention

[0005] The present invention has for its object to provide a method for building a concrete enclosure inexpensively such that the resulting enclosed space provides a comfortable, pleasant and safe habitat.

[0006] A feature of the invention is that practically no formwork is used, and the need for scaffolding and cranes is eliminated. This is accomplished by forming the main floor, or suspended floor, on the ground which is shaped preparedly to receive the structure formed with cementitious material.

[0007] It is an object of the present invention to provide a method for constructing a pattern for spherical screens by using the cementitious material with blocks.

[0008] According to an aspect of the invention, a method for constructing a pattern for manufacturing spherical screens is disclosed. The pattern being mounted on a ground comprises steps of forming a base using cementitious material with blocks to a height such that scraper blade is able to rotate more than 1800 when viewing from the front view as shown in Fig.1 from the center of the spindle. Providing a spindle supported with a plurality of bearings parallel to the ground projected from either sides at the centre of the base. Providing a scraper blade at a height such that is able to rotate more than 1800 from a centre of the axis of the spindle. Forming the pattern by filling cementitious material with blocks up to the volume occupied by the scraper blade when it is rotated to 1800 as shown in Fig.2. Applying plastering material to the formed pattern and scraping an extra layer by rotating the scraper blade to get smooth finished curved surface. Increasing the scraper blade length and changing the position of the spindle to form hemispherical patterns as shown in Fig.6 and proceeding with the steps for manufacturing large hemispherical screens that are used in simulation.

[0009] The foregoing and other objects, features, and advantages of the invention will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures.

Brief Description of Drawings

[0010] Specific objects and characteristics of the invention will be more readily understood from the following detailed description and accompanying drawings in which;

[0011] Fig. 1 illustrates a front view of a pattern of the present invention.

[0012] Fig. 2 illustrates a perspective view of the pattern.

[0013] Fig.3 illustrates a side view of the pattern.

[0014] Fig. 4 illustrates a sectional view of the pattern.

[0015] Fig.5 illustrates a top view of the pattern.

[0016] Fig.6 illustrates a hemispherical pattern.

Detailed Description of the Invention

[0017] It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

[0018] On the contrary, it is intended to cover alternatives, modifications and equivalents. Various modifications to the present invention will be readily apparent to a person skilled in the art, and can be made to the present invention within the spirit and scope of the invention.

[0019] In accordance to an exemplary embodiment of the present invention, a method for constructing a pattern for manufacturing spherical screens is disclosed. The pattern being mounted on a ground comprises steps of forming a base using cementitious material with blocks to a height such that scraper blade is able to rotate more than 1800 from centre of the spindle. Providing a spindle supported with a plurality of bearings parallel to the ground projected from either sides at a centre of the base. Providing a scraper blade at a height such that is able to rotate more than 1800 from the centre of the axis of the spindle. Forming the pattern by filling cementitious material with blocks up to the volume occupied by the scraper blade when it is rotated to 1800 as shown in Fig.2. Shaping the surface of the pattern by revolving the scraper blade about a point. Applying plastering material to the formed pattern and scrap the extra layer by rotating the scraper blade to get smooth finished curved surface.

[0020] By Increasing the scraper blade length and changing the position of the spindle to form hemispherical patterns as shown in Fig.6 and proceeding with the steps for manufacturing large hemispherical screens that are used in simulation.

[0021] FIGS. 1 - 6 illustrate views of a pattern 100 - 600 as shown. In these figures, the pattern as disclosed comprises a base on a predetermined area on the ground using cementitious material with blocks (102) to a height such that a scraper blade (104) is able to rotate more than 1800 from the centre of a spindle (406). Spindle (406) with bearings (408) is placed at the central portion of the base and parallel to the ground as shown in Fig.4.

[0022] In accordance to an exemplary embodiment of the present invention, Bearings (408) are rigidly fixed at the centre of the base with cementitious material, spindle (406) can able to rotate. Scraper blade (404) is made by a flat steel plate shaped to the segment of a sphere of required radius and its length equal to the required angle of screen when viewed from side view as shown in Fig.3. Scraper blade (404) is rigidly fixed to the spindle (406) such that the centre of the arc intersecting with the axis of the spindle (406) so as if the spindle (406) rotates the scraper blade (404) also rotates and forms a segment of the sphere as the plane of the scraper blade (404) and plane of rotation of scraper blade (404) are perpendicular.

[0023] In accordance to an exemplary embodiment of the present invention, Form the pattern by filling cementitious material with blocks (402) up to the volume occupied by the scraper blade (404) when it is rotated to 1800 as shown in Fig.1. Scraper blade (404) is rotated over the cementitious material (402) to scrape the extra layer so as to get the curved surface, and then apply plastering material to the pattern and scrape the extra layer by rotating Scraper blade (404) over it to get smooth finished curved surface.

[0024] In accordance to an exemplary embodiment of the present invention, by increasing the scraper blade (604) length and changing the position of spindle (602) with bearings in the above method we can form hemispherical pattern (600) shown in Fig. 6 by which we can manufacture large hemispherical screens.

[0025] With this single pattern, large screens can be made and aligning such less number of large segments of the screen we can make spherical screens with less effort, time and cost which would overcome the disadvantages of conventional approaches of deformation of moulds, time consumption in precise alignment of more number of screen segments and misalignment of more number of screen segments.
,CLAIMS:Claims:
I/We claim
1. A method of constructing a pattern for manufacturing spherical screens, the pattern being mounted on ground, comprises steps of:
forming a base on the ground using cementitious materials with blocks;
providing a spindle supported with a plurality of bearings parallel to the ground projected from either sides at the centre of the base;
providing a scraper blade at a height such that is able to rotate more than 1800 from a centre of the axis of the spindle;
forming the pattern by filling cementitious materials with blocks up to the volume occupied by the scraper blade when it is rotated to 1800;
shaping the surface of the pattern by revolving the scraper blade about a point;
applying plastering material to the formed pattern and scraping the extra layer by rotating the scraper blade to get smooth finished curved surface;
increasing the scraper blade length and changing the position of the spindle to form hemispherical patterns; and
proceeding with the steps for manufacturing large hemispherical screens.

2. The method of claim 1, wherein said base can be formed to a height such that the said scraper blade can able to rotate more than required length of the said screen.

3. The method of claim 1, wherein said bearings are rigidly fixed at centre of said base on which the spindle will rotate.

4. The method of claim 1, wherein said scraper blade forms a segment of a sphere in shape as per a desired angle of the screen.

5. The method of claim 1, wherein the pattern is formed up to a volume of the said scraper blade.

6. The method of claim 1, wherein said scraper blade scrapes an extra layer of the cementitious material to form the desired pattern.

7. The method of claim 1, wherein said spindle, supported with a plurality of bearings rotate about parallel axes and wherein the scraper blade further can be increased in length to form a desired pattern therefore to fabricate a desired screen used in simulation.

8. The method of claim 1, further comprising means for adjusting a normal position of a frame supporting the scrapper blade to vary in length between said spindle and the scrapper blade, and thereby to extend the length of it when making larger patterns.