US 1743194 A
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Description (OCR text may contain errors)
Jan. 14, 1930. J. B. DEANE RADIO LOUD SPEAKER Filed May 17, 1927 .237 LTEHE'UIZ 3? Eflsans 6 Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE RADIO LOUD-SPEAKER Applicatibn filed May 17,
My invention relates to improvements in radio loud speakers and the object of the invention is to devise a loud speaker which has an improved clarity of tone and in which the volume of sound therefrom is greater for a given diameter of diaphragm than is at present the case. Conversely where the volume of sound is not to be increased the diameter of the instrument can be reduced.
My invention consists of a loud speaker constructed and arranged all as hereinafter more particularly described and illustrated in the accompanying drawing in which Fig. lrepresents a vertical section through one form of device constructed according to mounted on such rod in like fashion.
Fig. 2 is a vertical section thereof through the line 2-2 (Fig. 1).
' Fig. 3 is a side elevation (partly in section) of a modified form in which no outside casing is used.
*Like characters of reference indicate corresponding parts in the different views.
1 is the base of the instrument. 2 is a reproducer unit or other similar device for transforming electric Waves into sound waves. 3 is a rod connected to the reproducer unit in the orthodox fashion at one end, and its other end connected-to a cone-shaped diaphragm 4 mounted on such rod and held in position by the nuts 5; 6 isa second cone-shaped diaphragm mounted on the rod 3 by further nuts 5, and 7 is a third cone-shaped diaphragm diaphragms 6 and 7 are spaced apart from each other and from the diaphragm 4, said diaphragms preferably being mounted so as- Figs. 1 and 2 enclosed in a casing to simulate the appearance of the ordinary cone loud speaker it is to be understood that they can be mounted in any other type of loud speaker wherein a rod or its equivalent is employed connected to the reproduction unit, and they 1927. Serial N0. 192,108.
can also be used without any casing as depicted in Fig. 3.
By employing a plurality of cone-shaped diaphragms mounted as above described the volume of sound from the instrument can be materially increased Without increasing its diameter and improved tone is achieved. It is well known that the diameter of such instruments is limited and consequently their sound volume is limited owing to diaphragms beyond a certain size developing certain undesirable characteristics. No such defects appear in my construction.
From the above description it will be apparent that I have constructed a device which will be compact as Well as simple and in which the volume of sound therefrom, as well as the clarity of tone, is materially improved.
What I claim as my invention is:
In a radio loud speaker, the combination with a reproducer unit including a rod, of a plurality of spaced apart cone-shaped diaphragms concentrically mounted on the rod, the inclination of all the cone surfaces of the diaphragms being identical, and the diameters of such diaphragms varying to each other, said diaphragms inserted one within the other.
JOHN BRADLEY DEANE.