US1994866A

US1994866A - Sound radiator

Info

Publication number: US1994866A
Application number: US561973A
Authority: US
Inventors: Ovenhausen Franz
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-09-16
Filing date: 1931-09-09
Publication date: 1935-03-19
Anticipated expiration: 1952-03-19

Description

March 19, 1935. OVENHAUSEN SOUND'RADIATOR Filed Sept. 9, 1931 Z 0mm h a (456/) Patented Mar. 19, 1935 UNITED STATES PATENT OFFICE SOUND RADIATOR Franz Ovenhausen,

Steinheim, Germany 9 Claims.

The present invention relates to a. sound radiator, i. e. particularly to the construction of a sound radiator of wood. Sound radiators of wood are already known. In conjunction with these, however, no attention has been paid to the course taken by the veinage. In accordance with the present invention the sound radiators are made from veneering wood exhibiting a radial veinage. The production of such veneers has been described in my American Patent 1,807,251. The present invention, however, is not to be limited to the employment of veneers being produced in accordance with that patent.

In the drawing the invention has been shown by way of example,

Fig. 1 representing therein a side view of a loudspeaker with a sound radiator in accordance with the invention, partly in section.

Fig. 2 is a plan view of the sound radiator in accordance with Fig. 1.

Fig. 3 diagrammatically illustrates the production of the sound radiator.

In the drawing (1. represents a yoke of an electro-magnet. This electro-magnet has been equipped with coils b. c indicates a metallic diaphragm, freely carrying over a pin d a sound radiator f. Using pressure disks, the sound radiator f is fixed over a screw connection by means of the pin d. The sound radiator 1 consists of veneer wood. As shown by Fig. 2, the veinage of the veneering wood takes a radial course. The entire sound radiator f consists of veneer spirally pared off. Such a spiral-shaped veneer is obtained, for instance, by paring off a wood trunk by means of a cutter which is rotatable conically of the axis of the trunk and slidably mounted in the direction of the axis thereof, as described in United States Patent No. 1,807,251. The principle of producing the spiral-shaped veneer is obvious from Fig. 3. h indicates a blank (workpiece) of wood which may be moved forward in the direction of the arrow A. 2' is a cutter which is secured in a conical holder is adapted to rotate about the axis 102 of the blank (workpiece) by means of a pinion 701. During the simultaneous rotation of the cutter i and forward movement of the blank h, an endless spiral-shaped veneer m is produced which may be suitably cut and shaped in accordance with the diaphragm f. The joint g is of the swallow-tail type. In order to provide a compensation for the joint 9, the sound radiator may be made to consist of two equally shaped veneer disks, the joints of which are staggered by 180.

The mode of acting of the arrangement is as follows:

The alternate current fed to the coils b causes the diaphragm c to vibrate. The vibrations of the diaphragm c are transmitted to the sound radiator f. Owing to the radially running veinage of the sound radiator a particularly pure reproduction of the musical sound is ensured. The sound radiator may also be composed of separate wooden sectors. The only essential feature is that the veinage takes a radial course.

I claim:

1. In a sound generator a support, on the support a sound radiator, means for causing the support to vibrate, said sound radiator consisting of sections of wood, the veinage of each section substantially taking a radial course.

2. In a sound generator in accordance with claim 1, the sound radiator consisting of a veneer leaf with wavy running joint.

3. In a sound generator in accordance with claim 1, said means consisting of an electro-magnetic system.

4. In a sound generator in accordance with claim 1, the support being concentrically fixed to the sound radiator.

5. In combination, a vibratory member, a sound radiator secured centrally to said vibratory member, said radiator being formed of sections of wood, each section having the grain thereof disposed radially from the point of connection of the radiator with the vibratory member.

6. In combination, a sound radiator, means for causing the radiator to vibrate, said radiator containing a diaphragm part of an integral piece of wood, the grain of which is disposed radially.

'7. In combination, a sound radiator, means for causing the radiator to vibrate, said radiator consisting of wood, each grain line of which being substantially disposed radially.

8. A reproducer diaphragm containing an integral sheet of wood, the grain of which being in convergence toward the center for uniform vibration.

9. A reproducer diaphragm containing a sheet of wood symmetrically arranged to the center of vibration, the joint of said sheet running in a wavy line.

FRANZ OVENHAUSEN.