US 4,227,051 AGranted

Loud speaker and enclosure system

OwnerWayne W. Thomas, Walter C. Thomasinventors

Life of this patent

Estimating the term…

Loading patent…

Abstract

A loud speaker and enclosure system that has improved acoustical properties, comprises a cubical frame composed of two sidewalls, a top and a bottom, having an open front and back. The frame is made of substantially rigid material. The backwall is closed by means of a panel of styro-foam. An acoustical horn in the form of a truncated square pyramid is molded from foamed plastic and is of such size as to be fitted into the inner space of the frame with the wide end of the pyramid at the front end of the frame. Means are provided at the corners of the pyramid, for attachment to the frame. Along the walls of the horn there is a space between the walls of the horn and the walls of the frame, of selected dimension. At the small end of the horn is a transverse wall, which has a circular opening. A low frequency, large diameter, cone type speaker is fastened to this wall, mounted inside of the horn, with the cone facing toward the back of the frame. A structure, is mounted to the loud speaker and supports one or more higher frequency, smaller speakers, which are faced toward the front of the frame.

Claims15

Dependent claims

A loud speaker assembly and enclosure system, comprising;

(a) a three dimensional frame enclosing a volume of selected shape, and having an open front and back;
said frame, made of substantially rigid material;
(b) means to enclose said back of said frame with a planar sheet of foamed material of selected composition and thickness, attached to said frame;
(c) a truncated tapering horn, of overall dimension across the large end, a selected dimension less than the internal dimension of said frame;
said horn made of foamed material of selected composition and wall thickness;
and small end of said horn closed with a wall of said foamed material;
and means to support said horn to said frame at a plurality of points around the perimeter of said horn, near the front end of said frame, such that when said horn is positioned inside said frame, the space between said horn and said back closure communicates with the front of said frame through openings of selected width over at least a portion of its perimeter;
(d) a circular opening in the transverse wall across the small end of said horn, and means to mount a large diameter cone speaker, inside said horn, across said circular opening, facing to the back of said frame;
and
(e) means to mount at least one high frequency speaker, inside said horn, facing toward the front of said frame.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/014,908Filed 26 Feb 1979
Granted: 7 Oct 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04R 1/24
For obtaining desired frequency characteristic only: structural combinations of separate transducers or of two parts of the same transducer and…
H04R 1/2819
Of the bass reflex type: for loudspeaker transducers
H04R 1/288
By means of damping material, e.g. as cladding: for loudspeaker transducers
H04R 1/30
For obtaining desired frequency characteristic only: combinations of transducers with horns, e.g. with mechanical matching means , i.e.…