US2920150A

US2920150A - Support for microphones

Info

Publication number: US2920150A
Application number: US430498A
Authority: US
Inventors: Louis R Burroughs
Original assignee: Electro Voice Inc
Current assignee: Bosch Security Systems Inc
Priority date: 1954-05-18
Filing date: 1954-05-18
Publication date: 1960-01-05
Anticipated expiration: 1977-01-05

Description

Jan. 5, 1960 L. R. BURROUGHS 2,920,150

SUPPORT FOR MICROPHONES Filed May 18, 1954 2 Sheets-Sheet 1 Jan. 5, 1960 L. R. BURROUGHS SUPPORT FOR MICROPHONES 2 Sheets-Sheet 2 Filed May 18, 1954 United States Patent O SUPPORT FOR MICROPHONES.

Louis R. Burroughs, Buchanan, Mich., assignor to Electro- Voice, Incorporated; Buchanan, Mich..

Application May 18, .1954, Serial No. 430,498

3 Claims. (Cl. 179-146) This invention relatesgenerally to devices for supporting microphones, or similar transducers, and more particularly to devices for supporting sensitive microphones in such a fashion as to eliminate pick up of unwanted or extraneous sounds.

In carrying out the invention, amounting bracket is connected to a microphone boom and is arranged to be oriented with respect thereto in any desired position. The mounting bracket is provided with spaced arms which extend in directions substantially to define elements of a right rectangular base pyramid. The microphone is located substantially in the plane defined by the ends of these arms and is held in a fixture clamped to the'microphone and having stub mounting arms which extend in a plane and in directions corresponding to the ends of the aforesaid arms, the distance between each pair of the stub and the aforesaid arms being spanned by a length of resilient material of low natural resonant frequency, as for example, an elastomer like a rubber band or the like.

One of the principal objects of this invention is to provide a microphone support characterized by absence of any substantial tendencyto transmit unwanted vibrations to the microphone, even though it may be mounted at an end of a long goom which-must be moved rapidly in following the action of a television program, or the like.

Another object of the invention is tosupport a microphone in a manner sotha-tit will be isolated from any vibrations or shocks resulting from rapid movement of the microphone, and toprovide a microphone support having a natural resonance frequency outside the normal frequency response range of the microphone, the vibrations of which may be damped rapidly.

Other objects and important features of the invention will be apparent from a study of the following specification taken with the drawings, which together show a preferred embodiment of the invention and what is now considered to be the best mode of practicing the principles thereof. Other embodiments of the invention may be suggested to those having the benefit of the teachings herein, and it is therefore intended that the scope of the invention not be limited by the precise embodiment herein shown,'the scope of the invention being intended to be limited only by that defined in the subjoined claims.

In the drawings:

Figure 1 is a front elevation of a microphone support according to the present invention, said support being shown with a microphone supported thereby;

Figure 2 is a side elevation view of the support seen in Figure 1;

Figure 3 is a sectional view of the support seen in Figure 1 taken along the line 3-3 of Figure 1;

Figure 4 is an enlarged vertical sectional view taken through the support seen in Figure 1, taken along the line 44 thereof, and looking in the direction of the arrows;

Figure 5 is an enlarged fragmentary front elevation view showing the manner in which the support may be adjusted in position with respect to a microphone boom o'r-the like, said view beingtaken along the--line'55' details of a construction for clamping the microphone v supported by the apparatus accordingto thepresent'invention.

Referring now to the'drawings, the microphone sup-- port according to the present invention is referred to I generally by the reference numeral 10 and consists of a depending bracket 11 having a mounting ear 12 to be secured to a'boom 13 by means of a mounting stub 14 and a wing nut 16. As seen in Figure 4, the bracket 11 is ofiset as at 17 sothat a vertical limb 18 thereof lies on the same'axis-as the depending portion 13'of the microphone boom.

The depending limb 18 provides a place of support

formicrophone support arms

19, 21, 22 and 23. Mounting arms 19 and 23-extend as shown from a central mount 24 and are integral therewith, while mounting arms 21' and 22 extend as shown from a similar central mount 26 and are also integral therewith.

The

center mounting members

24 and 26 for the

respective arms

19, 23 and 21, 22 are held to the depending limb 18 by means of a bolt 27 and a nut 28 threaded thereto, the bolt 27 passing through aligned apertures 29 in the

center mounting members

26, 24 and the depending'limb 18; The two

center mounts

24 and 26 are arranged to pivotas-a unit about the bolt 27 by means" of

rivets

31 and 32. See also Figure 5, which shows how the assembly thusfar described'may be so swiveled with respect to the depending arm 13.

As seen particularly with respect to Figures 1, 2 and 3, the

arms

19, 21, 22 and 23 define in space elements scribed substantially in the plane defined by the ends of the spaced

arms

19, 21, 22 and 23.

The microphone 35 is arranged to be held in a split clamp consisting of

members

33 and 34, member 33 having a clamping ear 36 depending therefrom, and

member 34 likewisehaving a clamping ear37 depending therefrom, the two ears being held together by means of a clamping screw 38 as seen particularly in Figure 2 and Figure 4. In order to provide a fulcrum point for the clamping action of the clamping screw 38 upon the microphone 35, each of the

ears

36 and 37 has

small bosses

39 and 41 extending therefrom which also space the two

clamping ears

36 and 37, as shown.

The clamping member 33 has short stub arms 42 and 43 which extend respectively in directions toward the ends of the

arms

22 and 23. Clamping member 34 likewise has stub arms 44 and 46 which extend respectively in the direction of the end of the

arms

23 and 19. Each of the

stub arms

42, 43, 44 and 46 has afiixed thereto respectively hooks 47, 48, 49 and 51. The

respective arms

19, 21, 22 and 23 terminate at each end in a

hook

52, 53, 54 and 56. As seen particularly with reference to the several figures, the hook 51 is joined to the hook 52 at the end of the arm 19 by means of a plurality of resilient strands 57, while hook 49 is joined to the hook 56 at the end of arm 23 by similar strands 58. Hook 47 is likewise joined to the book 54 at the end of arm 22 by means of similar strands 59, while hook 48 is joined to the hook 53 at the end of arm 21 by similar strands 61.

The several

resilient strands

57, 58, 59 and 61 may be made from an elastomer, as for example, rubber bands or the like, such substances having a low natural frequency outside the normal response of the microphone iPatented Jan. 5, 1960 35. Such substances have the property also of damping their vibrations rapidly, so that if the assembly shown with respect to the several figures is moved about rapidly, as would be the case when the boom 13 is moved in following the action of a television program or the like, any oscillation of the microphone 35 by reason of the fact that it is resiliently supported upon the

strandlike members

57, 58, 59 and 61 would be damped rapidly by reasons of the properties of said strands.

The support for the microphone 35 has been shown as mounting the microphone below the substantial plane passing through the ends of the spaced

arms

19, 21, 22 and 23. However, other clamping means than that shown for the microphone may be so arranged so that the microphone is disposed Well below such plane while the resilient support strands seen in the several figures occupy the plane of the ends of the arms. v

While the

support arms

19, 21, 22 and 23 describe elements of a right pyramid with a rectangular base, it is Well within the scope of the invention that such arms describe, by way of example, a right pyramid having a triangular base, and it is contemplated that the strands supporting the microphone will in such case be three in number. However, for purposes of simplicity of construction it is a preferred embodiment to have the arms supporting the microphone described in space, such a right pyramid having a rectangular base.

The structure according to the present invention enables a microphone to be supported in such a fashion that the support therefor will not transmit its natural resonant frequency into the microphone, since it is isolated by resilient strands having a natural resonant frequency well below that of normal response of the microphone 35.

While the invention has been described in terms of an embodiment which it has assumed in practice, the invention is not intended to be limited by the precise embodiment herein shown, nor otherwise than by the claims here appended.

I claim as my invention:

1. A microphone and support assembly comprising a bracket having arms extending in directions defining in space elements of a pyramid and a limb secured to the arms at the vertex of the pyramid and extending therefrom normal to the base of the pyramid, means disposed substantially in a plane parallel to the base of the pyramid defined by said arms for mounting a microphone,

4 said microphone supporting means having stub arms extending in directions toward said first named arms, a microphone having a frequency response range mounted on said mounting means, and a plurality of resilient strands each connecting one of said stub arms and a corresponding one of said arms, said strands and microphone being resonant at a frequency below the response range of the microphone.

2. A microphone and support assembly comprising a bracket having armzs extending in directions defining in space elements of a pyramid, microphone supporting means disposed substantially in' a plane parallel to thebase of the pyramid defined by said arms, a microphone mounted to the microphone supporting means having a frequency response range, and an elastomer strand mounted between the end of each of the arms and the microphone'supporting means, the strands and microphone having a resonant frequency below the response range of the microphone.

3. A sound responsive device comprising a stand having a limb adapted to be vertically disposed, a bracket attached to one end of the limb having four arms extending from the'limb defining in space the elements of a pyramid, the limb being disposed normal to the base of the pyramid, a clamp, a resilient strand attached to the clamp and mounted on the end of each of the arms, each of said strands being disposed on the base of the pyramid parallel to an arm thereof, and a microphone having a response range mounted in the clamp, said strands and microphone being resonant at a frequency below the response range of the microphone.

References Cited in the file of this patent UNITED STATES PATENTS 225,020 Pettengill Mar. 2, 1880 849,975 Carlson Apr. 9, 1907 1,536,407 Pettus May 5, 1925 1,653,109 Krietemeyer Dec. 20, 1927 1,780,719 Price Nov. 4, 1930 1,805,362 Ellis May 12, 1931 1,871,519 Hawley Aug. 16, 1932 2,557,570 Seiger June 19, 1951 2,679,369 Palley May 25, 1954 FOREIGN PATENTS 19,857 Great Britain Sept. 2, 1913