US 1558191 A
Description (OCR text may contain errors)
Oct. 20, 1925- B. LINDEMANN -EARPIECE Filed Dec. 27, 1924 INVENTOR ATTORNEY Patented 0a. 20, 1925.
UNITED STATES- BRUNO LINDEMANN, OF HAMBURG, GERMANY.
Application filed December 27, 1924. Serial No. 758,329.
To all whom it may concern:
Be it known that I, BRUNo L NnnMANN,
a citizen ofGermany, residing at- Hamburg,
Germany, have invented new and useful Improvements inEarpie ces, of which the following is a full, clear, and exact specification.
My invention relates to ear pieces and refers particularly to ear pieces adaptable to telephones and similar sound emitting devices,
In the use of telephones, radio receivers and other similar devices, it is frequently necessary to retain the ear pieces of the device against the'ear for a considerable length of time. and the hard ear pieces, usually incident to such devices produce unpleasant and painful results when thus em loyed.
ne object of my invention is a device capable of placement over the usual ear pieceand which will be retained in practically sound-proof position thereon with the exception of an opening therein for the emission of sound waves to an abutting ear.
Another object of my invention is a device of the character described composed of a soft yielding resilient material in a shape of construction which will have a cushion efiect, thus allowing of continued pressure against an ear without discomfort.
I have found "that sponge rubber is parti cularly suitable for this purpose.
My device comprises a hollow, somewhat flattened, spherical member having an opening upon one side for the insertion of the ordinary ear piece and an opening upon the ,other side to allow of the escape of the sound .waves to an ear pressed thereon.
I have found that when my device is composed of two semi-spherical members cemented, or otherwise fastened, together, the line of jointure has an important and valuable etfeot in retaining the device in its original form for purposes of producing themost satisfactory results.
The accompanying drawings and the specification relating thereto will clearly explain the device of my invention.
In the accom anying drawings, showing modifications o my device, similar parts are designated by similar numerals.
Fi re 1 is a front view of one form of the eviceof my invention.
Figure 2 is a rear view of Figure 1.
Figure 3 is a cross-secti0n through the line 3-3 of Figure 1.
Figure 4 is a side view of Figure 1.
Figure 5 is a vertical cross-section illustrating the method of application of my device.
Figure 6 is a perspective view of a modified form of my device.
The particular form of the device of my invention, shown in Fi res 1, 2, 3, 4 and ,5, comprises two approximately semi-spherical members 10 and 11", cemented, or otherwise fastened together, at 12, thus forming a flattened hollow spherical device. The side member 10 has ,an opening 13 and the side member 11 has an opening 14 preferably larger than the opening 13.
The modified form of my device, shown in Figure 6, consists of one element 15 form- I ing the flattened hollow spherical device, the two sides having openings corresponding to thosmshoWn in the other figures.
The device may be composed of any suitable soft, yielding, resilient material, but I prefer to use sponge rubber for this purpose.
In operation, the ear, piece 16 of a telephone, or radio-receiving device, is inserted through the 'o ening 13, the resiliency of the material of t e device holding it in'firm enclosed position.- When the ear 17 ispressed against the member 11, a practically sound proof jointure is formed allowing the full sound waves to pass through the openings 13 and 14.- to the ear.
The cushion-like shape of the device and the softness of the material forming it allow of its continued pressure against the ear without unpleasant effects. 1
.I do not limit myself to the particular size, shape, number, arrangement, or material of parts, as shown and described, as these are given simply as a means for clearly describing the device of my invention.
What I claim is i 1. In an ear piece, a soft hollow somewhat fiattened spherical resilient member, having an opening in one side thereof capable of fixed placement over a telephone receiver and having a smaller opening in the other side thereof.
2. In an ear piece,a hollow somewhat flattened spherical. soft rubber member, having an opening in one side thereof capable of fixed placement over a telephone receiver and having a. smaller openingin the other sponge rubber members cemented together side thereof. around the edge thereof, each member hay- 3. In an ear piece, two semiespherical soft in% a centralg positioned opening therein. 10 resilient members cemented to ether 'around igned at amburg, Germany, this 12th 6 the edge thereof, each member aving a cenday of November, 1924.
trally positioned o ening' therein.
4. In an ear piece, two semi-spherical BRUNO LINDEMANN.