US1715305A - Loud-speaker - Google Patents

Description

May 28, 1929. I 5, J OFFERLE 1,715,305

LOUD SPEAKER Filed MarBh s, 1927 Inventor swam CZ 6 5 6716,

Attornqy Patented May 28, 1929.

UNITED STATES SHER-M J. OFFERLE, OF WARREN, PENNSYLVANIA.

LOUD-SPEAKER.

Application filed March 8, 1927. Serial No. 173,738.

This invention relates to loud speakers, particularly adapted for use with radio sets.

An object of the invention resides in providing a radio loud speaker which is constructed so that it may be hung or suspended on the cabinet of a radio set and preferably along the back side thereof, so that the sound outlet opening in the head of the speaker is immediately above the cabinet for directing the sound outwardly, over the front portion of the cabinet, making it considerably easier in operating the set to tune in a station.

A further object of the invention resides 1n providing a loud speaker construction for radio sets which may be hung on the cabinet of the set and is adapted to be constructed and entirely of wood, having a sound amplifying chamber of rectangular section which is hung on the radio cabinet and suitably in sulated therefrom to prevent vibration in the set being transmitted to the sound amplifying chamber.

The invention comprehends numerous other objects which reside in the specific construction and relation of the parts as more particularly pointed out in the following detailed description and in the claims directed to the preferred form of the invention, it being understood, however that various changes 1n the size, shape and relation of the parts may be made without departing from the spirit and scope of the invention as herein set forth.

In the drawings forming part of th1s application;- I

Figure 1 is a front elevation of a radio cabinet having the loud speaker constructed in accordance with the invention applied thereto.

Fig. 2 is an end elevation of the radio cabinet showing the loud speaker construction in vertical transverse section.

Fig. 3 is a detail sectional view taken on the line 3-3 of Fig. 1.

The cabinet of a radio set is indicated at 1 having the top 2 as usual, on the rear edge of which is supported the improved loud speaker construction of this invention, generally indicated by the numeral 3.

This loud speaker construction includes a head 4 which is comprised ofthe front plate member 5 and the rear plate member 6 secured in spaced parallel relation by the frame 7 secured to the edge portions thereof. Felt pads 8 are secured on the lower faces of the 7 frame 7 adjacent the opposite end thereof as shown in Fig. 1, for engagement with the top 2 of the radio cabinet, by which the loud speaker is supported in insulated relation on said cabinet.

The central portion of the head 4 is provided with a rectangular opening, in which is mounted the horn structure 9. The upper enlarged end of the amplifying horn structure is mounted in the head 4 and the open end thereof is provided with a suitable screen or cover of silk or the like indicated at 10, which will not interfere with the sound but prevent dust from entering the interior of the amplifying horn and at the same time improve the appearance of the loud speaker. This horn structure is formed of a main body 11, while the portion secured in the head at extends laterally from the main body as indicated at 12 in Fig. 2. The main body as well as the portion 12 of the horn are of rectangular cross section and of gradually increasing size from the lower toward the upper end thereof. The rear wall 18 is provided with the curved portion 1st at the upper end thereof, merging into the upper wall of the lateral extension 12 secured in the head.

. The lower end of the horn is provided with a suitable opening to receive the extension 15 on the reproducer unit 16 of any suitable and desired character known in the art for electrically reproducing sound waves. The reproducer has communication with the interior of the horn structure 9,.so that the sound waves are provided and projected, and the air column within the horn vibrated in reproducing and amplifying the sound. This horn is constructed preferably, of wood, known to have greater resonance and tone amplifying qualities than other materials, and it is desired to use the types of hardwood which are known to be best adapted in constructing horns of this character.

The tapered structure of the horn body from the lower end to the upper end thereof, is of such a character as to adapt it to properly and uniformly amplify sound waves of audible frequency. A felt pad 17 is secured to the lower end of the horn body 9 and forms a third point ofsuspension for the loud speaker, so that the entire body of the horn is hung in spaced relation on the cabinet of the radio set.

With this construction, a highly novel combination has been provided in which the cabinet of a radio set is used as a base for supporting the loud speakers which is hung instead of mounted on the cabinet, in such a manner that the reproducing body is freely suspended in order that it may have a free, resonating action in the amplification of sound waves produced therein by the operation of the reproducer unit 16. i

WViththe outlet end Opening forwardly at the rear of the radio cabinet, so that in tuning the set to any desired station, the loud speaker unit is in proper position for the operator of the set to conveniently tune in a selected station. This loud speaker construction further cooperates with the radio set to pro duce a compact and novel association of the parts, at the same time presenting ahighly desirable finish and appearance of the set.

Having'thus described my invention, what I claim as new is i l.- Aloud speaker unit comprising a horn having itsbell end disposed horizontally and its. opposite end disposed vertically and adapted for support with respect to the similarly disposed surfaces'of a cabinet,a head extending transversely at opposite sides of 7 said bell end and resilient pads interposed between the ends of the head and the horizontal surface of the cabinet and between the Vertical section of the horn and the vertical surface of the cabinet whereby to suspend the horn in spaced relation therefrom.

2. A loud speaker unit'comprising a horn having its bell end disposed horizontally and its opposite end disposed vertically and adapted for support with respect to the similarly disposed surfaces ofa cabinet, a head formed at the bellend of the horn extending transversely at opposite sides thereof and composed of front and rear spaced parallel vertically extending plate members, open along their lower edges, said rear plate memher having an opening withthe bell'end of the horn fitted therein and said front'plat'e member having .a similar opening alined therewith, said plate members and said vertical section of the horn having a resilient pad interposed between the respective adjacent surfaces of the cabinet whereby to support the unit inspaced relation therefrom.

In testimony SHERM Ji OFFERLE.

whereof I aflix my signature;

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