|Publication number||US3731760 A|
|Publication date||May 8, 1973|
|Filing date||Dec 16, 1971|
|Priority date||Dec 16, 1971|
|Also published as||CA958340A, CA958340A1|
|Publication number||US 3731760 A, US 3731760A, US-A-3731760, US3731760 A, US3731760A|
|Original Assignee||Lowe Manuf Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (11), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
0 I United States Patent 1 [111 3,731,760 Hammes [451 May 8, 1973  HIGH SECURITY LOUD SPEAKER 2,949,163 8/1960 Friedman ..I8l/3l 'B BAFFLE Primary ExaminerStephen J. Tomsky  Inventor. Josef J. l-lammes, St. Louis, Mo. Atmmey Glenn K Robbins  Assignee: Lowe Manufacturing Company, St.
Louis, Mo.  ABSTRACT  Filed: Dec. 16, 1971 A high security loud speaker baffle for use in institutions such as prisons and the like to resist vandalism.  Appl' 208779 The baffle is comprised of a pair of concave castings constituting a hollow baffle receiving a loud speaker. 52 us. or. ..1s1/31 B, 206/15, 220/18, Each of the Castings has a rim p one of which is 248/203 exterior and the other interior, interfitting with one 51 Int. c|...- ..G10k 13/00 H04r 1/28 another and butting against Shwlders- The  Field of Search l l 181/31 B 31 fitted concave castings can be supported within a cra- 'EI 2418/2023 dle receiving the rim portion and connected by tamper-proof screws to resist removal. The hollow loud speaker baffle comprised of the interfitted con-  References Cited cave castings in addition to being used as a UNITED STATES PATENTS bidirectional baffle with the cradle can be simply em- I ployed by connecting one of the castings directly to a 2,718,931 9/1955 Boudouns ..l8ll3l B l surface to provide a unidirectional f 2,821,260 l/l958 Shaffer 2,829,728 4/1958 Brown ..181/31 B 9 Claims, 19 Drawing Figures Patented May 8, 1973 2 SheetsSheet 1 Patented May 8, 1973 3,731,760
2 Sheets-Sheet 2 -54 figja HIGH SECURITY LOUD SPEAKER BAFFLE SUMMARY OF THE INVENTION In the past various types of institutional loud speaker baffles have been employed. These have been both unidirectional for mounting directly to a wall or bidirectional for mounting upon a cradle. The problem has always existed to provide a high degree of security to resist vandalism.
By means of the instant invention there has been provided a strong, durable, rugged, and simply installed high security loud speaker baffle which can be employed both as a bidirectional baffle with a specially designed cradle or as a unidirectional baffle for mounting directly upon a wall surface.
The high security loud speaker baffle of this invention is comprised of a pair of concave castings each having a peripheral rim portion. The rim portions are specially designed so that one is an exterior portion and the other casting has an interior rim portion, which portions interfit and abut against shoulders. The rim portions are raised and are seated within a specially designed cradle with aflixation being provided from the interior of the cradle. The cradle is adapted to be connected to a junction box or mounting box by tamper proof screws. In the installation of the baffle, a loud speaker can first be connected to one of the concave castings with the connecting wire being interfitted through a hole, and the other casting then affixed to the first, the wiring being accommodated in the second casting by means of a notch in the rim that registers with the hole in the first casting.
The loud speaker baffle may also be simply connected to a wall surface to provide a unidirectional baffle without the use of a cradle. This is accomplished by affixing one of the concave castings directly to the mounting box or other base on the wall surface and then simply connecting the other half of the loud speaker baffle constituting the mating concave casting.
The above features are objects of this invention and other objects will appear in the detailed description which follows and will be otherwise apparent to those skilled in the art.
For the purpose of example there is shown in the accompanying drawings a preferred embodiment of this invention. It is to be understood that these drawings are for the purpose of illustration only and that the invention is not limited thereto.
In the drawings:
FIG. 1 is a view in front elevation of the cradle mounted baffle.
FIG. 2 is a view in side elevation thereof.
FIG. 3 is a view in rear elevation of the cradle mounted baffle.
FIG. 4 is an enlarged view in section taken on the line 4-4 of FIG. 1.
FIG. 5 is an enlarged view in section taken on the line 5-5 of FIG. 1.
FIG. 6 is a fragmentary plan view of the front baffle showing the perforated screen holes.
FIG. 7 is an enlarged view in section taken on the line 7-7 of FIG. 6 showing the connection of the screen.
FIG. 8 is a top plan view partially broken away of the mounting or junction box.
FIG. 9 is a view in side elevation partially broken away of the mounting or junction box.
FIG. 10 is a bottom plan view of the cradle.
FIG. 11 is a view in section taken on the line ll-l1 of FIG. 10.
FIG. 12 is a top plan view of the cradle.
FIG. 13 is a fragmentary plan view of a specialized tool used for the security screws.
FIG. 14 is a view in end elevation taken from the right hand of the tool of FIG. 13.
FIG. 15 is a fragmentary exploded view in axial cross-section showing the interfitting of the front and rear baffles.
FIG. 16 is a fragmentary exploded plan view showing the interfitting of the front and rear baffles.
FIG. 17 is a plan view showing the unidirectional mounting of the baffle to a wall.
FIG. 18 is a view in side elevation of the mounted baffle of FIG. 17 partially broken away in section.
FIG. 19 is a view in section taken on the line 19-19 of FIG. 18.
DESCRIPTION OF THE INVENTION The loud speaker baffle of this invention is generally identified by reference numeral 20 in FIGS. 1 through 4. As there shown, it is connected to a specially designed cradle22 affixed to a ceiling 24 through a mounting box 26 to provide for bidirectional emanation of sound waves from a conventional loud speaker 28 mounted within the loud speaker baffle.
The loud speaker baffle 20 is comprised of a front baffle housing 30 and a rear baffle housing 32. The front housing 30 is formed of a generally dish shaped or concave casting of aluminum or other metal to provide a rectangular protective grid 34. A rim 36 protrudes from the exterior of the casting for better seating within the cradle as will be described. The rim 36 of the front casting is formed as an exterior rim to interfit with the interior rim 38 of the rear casting. The rim 36 has an interior shoulder 40 and a' square end 42 to provide for mating and seating with the shoulder 44 and the square end 46 of the interior rimof the rear baffle. At the bottom of the baffle rim portions as best shown in FIG. 4 registering holes are provided in the exterior and interior rims designated by the reference numeral 48 to receive a tamper-proof screw 50 to connect the baffles together.
The front baffle rim at the top has an opening 52 to receive a wire for connection of the loud speaker which in the assembly of the housingmay be first connected to the front portion of the baffle. The mating portion of the interior rim 38 of the rear baffle as best shown in FIG. 15 and 16' is provided with a notch 54 to receive the connecting wire (not shown) in the installation.
The front baffle as shown in FIG. 4 is provided with openings 56 in the face of the casting to receive additional tamper proof screws 57 for affixation of a perforated metallic screen 58. The rear baffle is provided with threaded studs 60 integrally formed with the interior of the rear baffle casting to receive a perforated metallic screen 62. Both the screens 58 and 62 can be conventionally secured in place by Tinnerman nuts 64.
The cradle 22 is comprised of a rectangular box-like base 68 provided with openings 70 at the end for affixation to the junction box 26. The'affixation is provided by tamper-proof bolts 72. Supported upon the base 68 is an arcuate cradle 76 which has a central groove 78 receiving the exterior rim 36 of the front baffle when the front and rear baffle are connected together as shown in FIG. 4. An opening 80 is provided in the central portion of the cradle and the groove to receive an electrical lead wire and additional openings 82 are provided at the opposite ends of the cradle for reception of bolts 84vadapted to connect the baffle to the cradle as best shown in FIG. 4.
The junction box 26 is best shown in FIGS. 4, 5, 8, and 9. It is a box-like structure having a base 86 and end walls 88 and side walls 90. A central Opening 92 is provided for the loud speaker electrical connecting wire. Openings 94 are additionally provided in the base for connecting the box to the ceiling or wall through screws 96 as shown in FIG. 4. Threaded openings 98 are provided in the ends for reception of the tamperproof bolts fitting through the registering openings in the ends of the base of the cradle as shown in FIG. 5.
The tamper-proof screws used to prevent unathorized tampering are shown in FIGS. 6 and 7. They may take the form of either a screw or a bolt and are provided with a fiat beveled head having a pair of openings 100 instead of the usual diametrical slot. The openings 100 are adapted to be engaged by a specially designed tamper-proof screw driver shown in FIGS. 13 and 14 and identified by the reference numeral 102. This screw driver with a conventional handle (not shown) and a pair of prongs 104 at the end which are received by the openings 100 in the heads of the tamper proof screws and it is apparent that the screws or bolts can be threaded only by the use of the specially designed tamper-proof screw driver as shown.
The use of the loud speaker baffle 20 of this invention has been shown in FIGS. 1 through 4 with the eradle 22 for bidirectional generation of sound waves from the loud speaker 28 through both the associated grids and screens in the front and rear baffle castings. A modified use of the loud speaker baffle for unidirectional employment by direct mounting of the baffle upon a vertical wall surface 110 is shown in FIGS. 17 through 19. In this employment the cradle is not required to be used and the loud speaker baffle can be directly mounted to the wall by the connecting screws 1112 passing through the openings 56 in the front baffle. In this modification, the screen 58 is not required to be used and the loud speaker 28 may be mounted either to the front baffle as shown in FIG. 4 or to the rear baffle upon the threaded studs 60. In the unidirectional employment of the mofidication shown in FIG. 17 through 19, it will be understood that the lead wire opening 52 in the front baffle is plugged. The conventional lead wire for the connection of the loud speaker can be passed through the wall by passing it through the grid openings and the grid of the front baffle casting.
tion box itself. The rear baffle casting 32 is then interfitted with the front baffle casting in the relationship shown in FIGS. 15 and 16 with the exterior rim 36 of the front baffle fitting over the interior rim 38 of the rear baffle and with the notch 54 of the rear baffle registering with the opening 52 of the front baffle. The tamper-proof screw 50 is then fastened through the registering openings in the interfitting rims of the baffle castings as shown at the bottom of FIG. 4 through the use of the specially designed tamper-proof screw driver 102. It will be understood that other types of tamperproof screws and screw drivers can be used as desired as these are conventional in the art.
With the baffle castings connected together the bolts 84 are fitted through the openings 82 at the interior of the cradle and at the opposite ends to affix both the front and the rear baffle firmly to the cradle. Only two such bolts are required with one each being used on the front and rear baffles rims at opposite sides of the cradle. The cradle groove prevents twisting. The raised rim of the front baffle nests within the groove 78 and provides a secure interfit to resist any heavy blows caused by vandalism and the like.
With the baffle castings connected to the cradle, the cradle is then interfitted over the junction box in the relationship shown in FIG. 4 and the tamper proof screws 72 are inter-fitted in the registering holes at the ends of the base of the cradle and the junction box to complete the connection.
For the modification shown in FIGS. 17 through 19 for a unidirectional application, the cradle 22 is not employed. In this modification, the front baffle is used for a direct connection to the wall or a conventional junction box as desired. The loud speaker baffle may be connected either in the fashion shown in FIG. 4 to the front baffle or where desired may be connected to the rear baffle which in a change of relationship is actually used as a front baffle for the unidirectional application.
Various changes and modifications may be made within this invention as will be readily apparent to those skilled in the art. Such changes and modifications are within the scope and teaching of this invention as defined by the claims appended hereto.
What is claimed is:
1. In a high security loud speaker baffleenclosure: fir a d. e n b wkl k Mu in p rt sm a having a rim, the rim of one telescoping into the rim of the other, whereby when the housing portions are te stq her. 1192 idntlxf rm t n losure. the rim portion of at least one housing portion extending outwardly from the periphery of the enclosure providing a ridge; the rims being of rigid material and the t sc pi bein t i b ta tiatwidth to esis 5.69amtionof the parts by noncoaxial warping; at least one housing portion having an openwork grill that cannot be removed from the outside of the housing portion, so that a loudspeakerwithin the enclosure of the housings may be protected; tamper-proof means to hold the housing portions together with their rims telescoped, including a cradle engageable onto the rim of the conjoined housing portions, the cradle having a recess means complementary to the ridge on the one housing portion, and means to secure the enclosure to the cradle fihnly sothatKh e eiieldsacarihei be twisted with respect to the cradle.
2. In the baffle enclosure of claim 1, the telescoping rims both having projections forming at least one peripheral ridge and providing ridge walls facing oppositely, the cradle having its recess means shaped complementary to both ridge walls so that both ridge walls cooperate in resisting twisting.
1 in the baifi'lebfclaiid Lapin 'likeeleinent of the tamper-proof means being located opposite the cradle and joining the telescoping rims.
4. In the baffle 6? claim 1, the cradle comprising a hollow member, and tamper-proof means attaching elements inside the cradle, one extending into each housing element and affixing it to the cradle.
prevent twisting of the housing in the cradle.
7; Ifi't'h'bafile aretatifiieihz'eiaaizsenig' 'hoilow and having walls outwardly projecting from the housing, a bracket attachable to the wall and fitted within the said walls to be concealed by them, and tamperproof connectors between the cradle and the bracket.
'8'. iii the bafilebfilairfi"iTtfibpenii drlZgiilI having relatively large-openings, and a screen back-up in the housing back of the grill.
9. In the baffle of claim 1: both housings having openwork grills, and openings through one housing member to receive screws or the like for fastening it directly to a wall or like support.
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|US20040222038 *||Mar 8, 2004||Nov 11, 2004||Murata Manufacturing Co., Ltd.||Speaker cabinet and speaker device|
|U.S. Classification||181/199, 248/553, 206/1.5|
|Cooperative Classification||H04R1/023, H04R1/021|
|European Classification||H04R1/02A, H04R1/02B|