US3418877A

US3418877A - Musical instrument construction

Info

Publication number: US3418877A
Application number: US598801A
Authority: US
Inventors: Ito Michio
Original assignee: Individual
Current assignee: Individual
Priority date: 1966-06-07
Filing date: 1966-12-02
Publication date: 1968-12-31
Anticipated expiration: 1985-12-31

Description

Dec. 31, 1968 MICHIO rro 3,413,877

1 MUSICAL INSTRUMENT CONSTRUCTION Filed Dec. 2, 1966 Sheet Z/ERA J INVENTOR. F I62 M/cw/a 170 Dec. 31, 1968 MICHIO rro 3,413,377

MUSICAL INSTRUMENT CONSTRUCTION Filed Dec. 2, 1966 Sheet 2 of 5 INVENTOR. M/(f/l/O I70 w gw M Dec. 31, 1968 MICHIO' rro 3,418,377

MUSICAL INSTRUMENT CONSTRUCTION Filed D90. 2, 1966 Sheet 3 of 5 INVENTOR. MIC/U0 170 A TIURIIEYS.

United States Patent MUSICAL INSTRUMENT CONSTRUCTION Michio Ito, 3094, Kasuga-cho, 2-chome, Nerima-ku, Tokyo, Japan Filed Dec. 2, 1966, Ser. No. 598,801

Claims priority, application Japan, June 7, 1966,

41/ 53,005 5 Claims. (Cl. 84-414) This invention relates, in general, to the construction of musical instruments and method of forming such instruments, and, in particular, to a new and useful drum construction in which the end portion includes a film or layer of a material such as plastic having a marginal peripheral area which is directed into a synthetic resin layer which is formed between two rigid frame members and including a thread passed through the frames and the film to secure the assembly in place.

The present invention is an improvement over the prior art particularly in the fact that a drum may be constructed in a simple manner such that the timbre thereof will remain substantially unchanged during its useful life and in which the end pieces will be held in a tightened condition permanently. In accordance with the method of the invention, the drum is constructed by arranging two annular frames of different dimensions one within the other to leave a defined space therebetween which is filled with a resin material. An adhesive synthetic resin is then poured into the space between the frame elements and a plastic film such as Mylar which forms the end cover or end surface of the drum is arranged so that its peripheral edges are folded downwardly into the resin material before the latter is solidified. In addition, a thread is secured through the frames and the synthetic material and the marginal edge of the end cover which is held therein, to secure this assembly tightly together. Thereafter the resin material is permitted to solidify to form an assembly in which the Mylar film is held tightly in a permanent manner. An additional synthetic resin is applied around the frame elements in order to prevent the sewing thread and the Mylar film 3 from loosening in the assembly and also to beautify the outward appearance of the drum.

Accordingly it is an object of the invention to provide a drum of improved construction in which the end pieces are held securely in a frame assembly which includes a hardened synthetic resin material.

A further object of the invention is to provide a method of forming a drum which comprises arranging two substantially rigid annular frame members of slightly different dimensions one within the other, filling the space between the frame members with a synthetic resin material, thereafter applying an end cover over the innermost frame and directing its marginal periphery into the synthetic resin, sewing the frame members, the synthetic resin and the end covering into an assembly, and thereafter finishing the frame assemblies to form the completed drum.

A further object of the invention is to provide a drum construction which is simple in design, rugged in construction and economical to manufacture.

The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.

In the drawings:

FIG. 1 is a partial sectional and partial plan view of a drum constructed in accordance with the invention;

FIG. 2 is a partial sectional and partial elevational view of the drum of FIG. 1;

FIG. 3 is an enlarged partial sectional and partial plan view similar to FIG. 1; and

FIG. 4 is an enlarged sectional view of the end cover construction of the drum.

Referring to the drawings in particular, the invention embodied therein comprises a drum generally designated 10 which includes a cylindrical body generally designated .12 and end member assemblies generally designated 1-4 and 16, respectively, which are tensioned together by tensioning rod assemblies generally designated 18. The tensioning rod assemblies 18 include rod members 20 which extend through

collars

22 and 24 and which are threaded at their outer ends. Wing nuts 26 are threaded downwardly over the rods 20 to cause projections 28 formed on the collars to bear against an annular rigid member 30 of the end piece assembly 14.

In accordance with the invention, the end piece assembly 14 includes an end cover member 3 which is assembled at its peripheral ends into an annular frame assembly generally designated 32.

In accordance with the preferred method of the invention, the end piece 14 is formed by first arranging two annular members of different dimension 1 and 1' one within the other. Thereafter, the space between the annular members 1 and 1' is filled with a thick layer of an adhesive synthetic resin material 2. Before the resin material 2 becomes solidified, an end cover 3 made of a material such as Mylar is stretched over the inner frame 1 and its marginal edge is directed downwardly into the synthetic resin preferably to an extent to cause a slight portion of the lower end of the Mylar film 3 to project beneath the frames 1 and 1'.

The inner and outer surfaces of the frames 1 and 1' are provided with a plurality of circumferentially elongated recesses and through the frame openings at each end of each recess to permit the insertion of a sewing thread 4 through the frames and through the synthetic resin and the Mylar film 3 before the synthetic resin is completely solidified. The sewing thread is arranged to go through the holes and along the recess to the next hole and to extend all around the periphery of the annular members to hold the assembly together along with the synthetic resin material 2 after it becomes solidified.

After the sewing thread is secured and adhered in the assembly 30, a suitable resin solution 5 is applied around the exposed

frame elements

1 and 1 and the ends of the solidified plastic layer 2. This layer of resin solution 5 is then smoothly polished and it provides a covering to insure that the sewing thread and the Mylar film will be retained in the assembly.

Thus, with the invention construction, it is a simple matter to form the end piece assemblies 14 for the drum and the resultant structure is durable and will remain tight throughout the useful life.

While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

What is claimed is:

1. An end piece construction for a drum having a tubular body comprising first and second annular frame members of slightly different dimensions arranged one within the other and defining a space therebetween, an end cover member stretched over the inner one of said first and second frame members and having a marginal peripheral edge which is directed into the space between said first and second frame members, a synthetic resin material bonding the marginal edge of said cover member and said first and second frame members together, and a thread extending through said frame members, said marginal edge of said cover member and said synthetic resin material to additionally secure said cover and said frame members together.

2. A drum construction according to claim 1, wherein said frame members include holes defined therethrough for the passage of the therad therethrough, and recesses defined at the exit ends of each pair of said holes for recessing said thread therein.

3. A drum construction according to claim 1, including a covering of synthetic material extending around the exterior of said frames to engage said cover member at each end.

4. A method of forming a drum end cover assembly comprising arranging first and second annular members of different dimensions one within the other to define a space therebetween, pouring a synthetic resin material into the space between the annular members, stretching 4 a cover member of the inner one of said first and second annular members and directing its marginal periphery into the resin material before it is solidified, sewing through the end frame members, the resin material and the marginal edge of the cover member to secure the cover member to said end frame members and permitting the assembly to solidify.

5. A method according to claim 4, including adding an additional layer of synthetic material over the external surfaces of the frame members and said synthetic mate rial.

References Cited UNITED STATES PATENTS 5/1960 Belli et al. 84414 11/1966 Cheslow 84-414

Claims

4. A METHOD OF FORMING A DRUM END COVER ASSEMBLY COMPRISING ARRANGING FIRST AND SECOND ANNULAR MEMBERS OF DIFFERENT DIMENSIONS ONE WITHIN THE OTHER TO DEFINE A SPACE THEREBETWEEN, POURING A SYNTHETIC RESIN MATERIAL INTO THE SPACE BETWEEN THE ANNULAR MEMBERS, STRETCHING A COVER MEMBER OF THE INNER ONE OF SAID FIRST AND SECOND ANNULAR MEMBERS AND DIRECTING ITS MARGINAL PERIPHERY INTO THE RESIN MATERIAL BEFORE IT IS SOLIDIFIED, SEWING THROUGH THE END FRAME MEMBERS, THE RESIN MATERIAL AND THE MARGINAL EDGE OF THE COVER MEMBER TO SECURE THE COVER MEMBER TO SAID END FRAME MEMBERS AND PERMITTING THE ASSEMBLY TO SOLIDIFY.