Патент USA US2412212код для вставки
Dec. 10, 1946. E. F‘. GERLAT' 2,412,212 VIBRATO PRODUCING MEANS FOR MUSICAL INSTRUMENTS Filed Sept. 22, 1944 2 Sheets-Sheet l Patented Dec. 10, 1946 2,412,212 UNl'I'ED STATES PATENT OFFICE 2,412,212 VIBRATO PRODUCING MEANS FOR MUSICAL INSTRUMENTS Erving F. Gerlat, Racine, Wis. Application September 22, 1944, Serial No. 555,221 1 Claim. (Cl. 84-189) 1 2 This invention relates to musical instruments and has as .its general object the provision of piano of any conventional type, which, as is cus~ means ior imparting a vibrato quality to the tone of a musical instrument such as a piano. Another object of this invention is to provide a device capable of imparting a vibrato quality to musical instruments, which is especially ap tomary, is equipped with a sounding board 5 at the back thereof. The device of this invention, indicated gener ally by the numeral 1, is applied to the back of the piano and when in position preferably covers the entire back thereof. Essentially the plicable to vertical pianos and when applied device l‘ consists of an open faced chamber greatly improves the appearance of the instru formed by a curved upright wall 8, end walls 9, ment. 10 and a top wall [0. The top wall It has a plural Another object of this invention is to pro ity of ports H, which, together, comprise an out vide a device of the character described which let. When in position overlying the back of the may be constructed in various sizes for applica tion to instruments other than pianos and also piano, where it is held in any suitable manner, to loud speakers, particularly of the type em as by hooks I2 on the piano and brackets l3 on ployed in connection with electric guitars and the side wall 9, the sounding board or back of the piano in general cooperates with the walls similar musical instruments. A further object of this invention is to pro of the chamber to de?ne an air column, the out vide a device of the character described which is simple and readily applied to a piano or other - let or space through which the sound waves move to issue from ports H. The chamber should fit tightly against the back of the piano and preferably, though not necessarily, a felt packing strip or the like is pro vided along the vertical and bottom edges of the chamber to seal the juncture between the back described, and more particularly de?ned by the of the piano and the edges of the open face of appended claim, it being understood that such the chamber. changes in the precise embodiment of the here In the upper portion of the chamber is a ro indisclosed invention may be made as come with tatable butter?y valve I4. This valve extends 30 from end to end of the chamber and is of a size in the scope of the claim. The accompanying drawings illustrate several to substantially wholly close the air passage when compiete examples of the physical embodiment in a transverse position thus blocking the air of the invention constructed in accordance with column. Consequently, by rotation of the valve the best modes so far devised for the practical M the air column is intermittently interrupted to application of the principles thereof, and in impart a vibrato quality to the tone of the piano. which: Rotation is preferably imparted to the butter Figure 1 is a perspective view illustrating the ?y valve by a small electric motor l5 mounted manner of applying the device of this invention. within the chamber and drivingly connected to a vertical piano; thereto by a silent belt drive IS. The motor I5 is Figure 2 is a cross-sectional View taken through 40 adapted to be controlled by the operator or player Figure 1 on the plane of the line 2—2; by means of a switch and control cord not shown. Figure 3 is a top plan view of the vibrato proWhere the device of this invention is to be ap ducing device per se; plied to a horizontally strung or so-called Figure 4 is a view illustrating the application “grand” piano, it is mounted under the sounding of this invention to a horizontally strung piano; board, as shown in Figure 4, with the outlet ports Figure 5 is a bottom view of the installation ll facing the side of the piano. Obviously, of shown in Figure 4; course, the shape of the chamber must be some Figure 6 is a side view with a part broken away what altered to have it ?t the underside of such and in section illustrating the application of this a horizontally strung piano, but in its essential invention to a loud speaker; and 50 characteristics the device is identical with that Figure 7 is a front view of the device shown in illustrated in Figures 1, 2 and 3. Figure 6. In the case of a horizontally strung piano, it is Referring now particularly to the accompany preferable, however, to install a barrier of in ing drawings, in which like numerals indicate sulation material over the strings as indicated at like parts, the numeral 5 designates a vertical 55 ll’ in Figure 4. This insures the major portion instrument with which it is to be used. With the above and other objects in view, which will appear as the description proceeds, this in vention resides in the novel construction and ar rangement of parts substantially as hereinafter 25 2,412,212 3 of the tone being dispelled downwardly by the sounding board and through the vibrato produc ing device. _ The application of the invention to loud speakers, as shown in Figures 6 and 7, is sub stantially the same as that employed in conjunc tion with a vertical piano excepting that the unit is ,of smaller size and made to ?t the front of the cabinet or housing ! 8 in which the speaker is mounted. 4 attachment, comprising: a shallow box-like housing opening at its front and having a height and width substantially corresponding to the height and width of the piano for which the at tachment is intended; means for attaching the housing to the back of the piano with no portion of the attachment projecting over or to the sides of the piano so that the back wall structure of the piano closes the open front of the attach 10 ment by contact with the side and top and bot 'From the foregoing description, taken in con nection with the accompanying drawings, it will be readily apparent to those skilled in the art tom edges of the housing walls at said open front thereof, whereby the attachment covers and con ceals the back of the piano and cooperates there that this invention provides a novel manner of with to de?ne a substantially upright tonal pas imparting a vibrato quality to a musical instru 15 sage, said housing having an upper transversely ment such as a piano, which ordinarily does not extending wall portion thereof provided with a possess this characteristic, and that the device of tonal opening acting as an outlet for said tonal this invention is simple, readily applied and when passage; a rotatable valve extending transversely in position on a vertical piano greatly improves across said tonal passage beneath the tonal open the appearance of its back. ing to intermittently block sound waves moving What I claim as my invention is: An attachment for upright pianos to improve the appearance of the back thereof and to im part a vibrato tone to pianos equipped with the upwardly along the back wall of the housing to wards said tonal opening; and means inside the box-like housing for rotating the valve. ERVING F. GERLAT.