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GB1582183A - Construction and transport of loudspeaker cabinets - Google Patents

Construction and transport of loudspeaker cabinets Download PDF

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Publication number
GB1582183A
GB1582183A GB2545377A GB2545377A GB1582183A GB 1582183 A GB1582183 A GB 1582183A GB 2545377 A GB2545377 A GB 2545377A GB 2545377 A GB2545377 A GB 2545377A GB 1582183 A GB1582183 A GB 1582183A
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GB
United Kingdom
Prior art keywords
cabinet
panel
folded
panels
another
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2545377A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB2545377A priority Critical patent/GB1582183A/en
Publication of GB1582183A publication Critical patent/GB1582183A/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/02Casings; Cabinets ; Supports therefor; Mountings therein

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Description

(54) IMPROVEMENTS IN AND RELATING TO THE CONSTRUCTION AND TRANSPORT OF LOUDSPEAKER CABINETS (71) I, ROBERT WALKER, of 8, Bedford Grove, Tinshill, Leeds, Us 16 6DT, West Yorkshire, a British subject, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be par-' ticularly described in and by the following statement: The invention relates to the construction and transport of loudspeaker cabinets.
Loudspeaker cabinets, particularly those used for broadcasting by "pop" groups and containing speakers of high amplifying power, uaditionally take the form of a rectangular closed box and are relatively large and cumbersome to transport and manoeuvre into place. The speaker as such is often fairly small in relation to the size of the cabinet in which it is mounted, and in the case of the pop groups briefly referred to above, this can cause trouble because the speaker cabinets repeatedly need to be assembled, taken down and transported between one place of performance and the next.
The trouble arises, primarily because each pop group has to transport its own musical instruments and speaker cabinets, and in most cases all this equipment must fit into the back of a 15 cwt. van such as that available commercially under the name "Transit" (Trade Mark) and made by the Ford Motor Company. This size of van is the maximum that can be driven on an ordinary motorcar licence without needing a public service vehicle driving licence, and although it is exceptionally roomy for its size, its load-carrying capacity is necessarily limited when faced with these inordinately large loudspeaker cabinets.
My invention seeks to make it possible for these speaker cabinets to be manoeuvred and positioned with the minimum of trouble, and to be transported in a form which takes up the minimum amount of room.
In its broadest aspect, my invention is embodied in a loudspeaker cabinet whose front panel (i.e. the panel actually carrying the speakers) is readily detachable from the rest of the cabinet and in which the panels forming the back and sides of the rest of the cabinet can be folded flat on top of one another, so as effectively to "collapse" the cabinet.
With such a construction, the front board can be then laid or stacked flat on top of or adjacent the folded cabinet panels and the entire cabinet unit and speakers can be transported (for example, in vans of the kind referred to above) and will take up the minimum of room during transport.
It will be understood, of course, that however the panels of the cabinet are arranged to fold flat on top of one another, an adequately sound-proofed seal must exist between abutting edges of the cabinet when the cabinet is folded out and assembled again. If this were not so, the acoustics of the cabinet would be unacceptable and the performance would not be accurately reproduced. I therefore presently prefer to have at least one resilient sealing strip running down the interface between abutting panels, so that when the panels are folded out again and the cabinet is assembled the sealing strip is compressed to give the necessary sound-proof characteristics to the cabinet.
A similarly suitable sealing means would, of course, also be incorporated around the edges of the detachable front panel itself.
Any suitable hinge means can be used two enable the cabinet panels to fold flat on one another but there must be provision for the cabinet panels to be rigidly secured relative to one another when the cabinet is folded out and reassembled. I presently prefer to do this by using what are known as "up and over" fasteners or "over centre" fasteners, but it is conceivable that quick-fastening screws would prove acceptable for this purpose.
Frequently, loudspeaker cabinets are used in pairs. I therefore preferably provide, and describe herein, a wheeled or castored trolley in combination with two loudspeaker cabinets, each embodying my invention and each folded flat, and their associated front speakercarrying boards, carried in back-to-back relation on the trolley. Such a trolley could be made of light-weight tubular metal and would take up a minimum amount of room in, for instance, a "Transit" van of the kind previously referred to.
The accompanying drawings show, by way of example only, these various aspects of my invention. The drawings comprise three Figures, each consisting of a number of diagrams.
Figure 1 illustrates the basic principle of my invention applied to a two-speaker cabinet. The front speaker-carrying panel of the cabinet is detachable and the remaining four side walls of the panel fold flat on top of one another. Two such folded cabinets with their speaker-carrying panels can then be stacked vertically side-by-side in a tubular framed wheeled trolley of the kind shown in Figure 1. To the right hand side of this trolley in Figure 1, there is shown the trolley and the two stacked folded speaker cabinets as viewed from above: the two speaker boards are in the centre of the trolley, and the folded-flat cabinets are on the outside of their respective speaker-carrying panels.
The cabinets thus protect the speakercarrying panels, which in turn protect the speakers themselves, during transport of the trolley. This can prove particularly convenient when transporting two such speaker cabinets in the back of a "Transit" van as previously discussed. The trolley can simply be wheeled from the van, through the hall in which the eventual performance is to be given, and onto the stage where they can then be quickly assembled and positioned. Contrast this with the conventional non-collapsible speaker cabinets with which one has to struggle through the hall and up onto the stage after having manoeuvred them out of the transporting vehicle.
Figure 2 shows in detail the way in which the panels of the cabinet of Figure 1 fold flat on top of one another after the speakercarrying front panel has been removed. The panels are hinged to one another with ordinary butt hinges, but provision has to be made for the thickness of the panels when the hinges are mounted. For this reason an extra spacing strip of (in this particular case) 2" X 1" timber runs along one inside face of the back panel E, and the adjacent side panel A is hinged to that spacing strip with an overlap as shown.
Similarly the opposite side panel B is hinged along the other inside edge region of the back panel E with an overlap, although this time the overlap is only half that of the panel A.
This dictates the order in which the panels can be folded flat on top of one another.
Also illustrated in Figure 2 is my presently preferred method of achieving the necessary sound-proof seal between the folding panel faces. Relatively soft sponge rubber is used, which will easily be compressed when the panels are folded out to assemble the cabinet and which, whilst not obstructing or preventing the folding out process, will provide the necessary acoustic seal along the cabinet edges.
Figure 3 shows a further development of my invention. In this, the speaker-carrying panel can be folded to make for easier transport and storage and to protect the speakers themselves during transport and storage. The idea is shown applied to a four-speaker panel, but clearly the two-speaker panel of Figure 1 could be similarly treated.
Basically, the panel is split longitudinally between the two sets of speakers and is hinged so as to fold back and bring the speakers adjacent one another. Once again, the hinges used are ordinary butt hinges and, as diagrams 1 to 3 show in detail, these are mounted on spacing strips so that the two halves of the panel can fold fully parallel with one another whilst accommodating the depth of the speakers.
Also illustrated in Figure 3 is the use of soft sponge rubber sealing strips between the two panel halves, so that when the panel is folded out into its normal operating position there is a good acoustic seal between the two panel halves down the centre hinge line.
Diagram 6 of Figure 3 shows the provision of a leather carrying handle on the folding speaker panel. The handle is screwed to the outer face of one of the facing strips, and a corresponding recess is cut into the adjacent face of the other strip so that when the panel is folded out into its normal operative position the handle can be accommodated in the recess.
Although the handle in diagram 6 has been shown offset, it would normally be placed centrally. This makes it much easier to carry the panel and its relatively heavy speakers.
Diagram 8 of Figure 3 shows a further development of this aspect of the invention.
If, say, one or both of the short sides of each speaker half-panel were to be boxed in the same way as the hinge-carrying sides, two advantages would follow. Firstly, when the boxed panel halves were folded back on one another the box sides would provide a positive register against one another and prevent the speakers themselves from being damaged; and secondly, latches can be incorporated as shown in diagram 8, the latches being mounted on one half-panel and being spring loaded into engagement with a pin projecting from the other half-panel. When the half-panels are folded flat against one another, the pins override the ends of the latches which then spring into engagement with them, but the latches must be positively released before the halfpanels can be folded out again.
Diagram 9 is intended to show, in end elevation, the provision of a line of metal tabs along all four boxed edges of the speakercarrying panel. These metal tabs, which are not shown in detail, incorporate threaded holes which are continued in clearance size through the box side itself. Corresponding clearance holes are drilled along the edge regions of the panel sides of the main cabinet, so that when the speaker-carrying panel is fitted into the cabinet a series of suitably threaded screws can be used to secure it in place.
As shown in the drawings, the speakercarrying panel is so sized that its boxed edgesfit closely inside the open cabinet whilst the panel itself rests on the edges of the cabinet side panels. The necessary acoustic seal can be achieved by lining the side panel edges, or the appropriate regions of the speakercarrying panel, with soft sponge rubber strip as previously outlined.
I said above that there must be provision for the cabinet panels to be rigidly secured relative to one another when the cabinet is folded out. Threaded screws engaging predrilled and threaded bores could be used, but I presently prefer to use proprietary "over centre" fasteners inside the cabinet. These comprise two co-operating halves, in the form of a tongue engagable with a lever-action clip.
The tongue and the clip could be secured to the inner faces of respective side panels, so that when the panels are folded out the tongue and the clip end up adjacent one another and can be engaged with one another to hold the two panels relatively in place.
The scope of the invention is defined by the

Claims (3)

following claims. WHAT I CLAIM IS:
1. A loudspeaker cabinet whose front panel is readily detachable from the rest of the cabinet and in which the panels forming the back and sides of the rest of the cabinet can be folded flat on top of one another so as effectively to "collapse" the cabinet.
2. A cabinet in accordance with claim 1, in which the front panel itself can also be folded in half in such a way that where two or more speakers are carried by the panel the speakers fold down adjacent to one another and are protected by the folded panel halves.
3. A loudspeaker cabinet constructed and arranged substantially as described herein with reference and as illustrated in the accompanying drawings.
GB2545377A 1978-05-24 1978-05-24 Construction and transport of loudspeaker cabinets Expired GB1582183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2545377A GB1582183A (en) 1978-05-24 1978-05-24 Construction and transport of loudspeaker cabinets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2545377A GB1582183A (en) 1978-05-24 1978-05-24 Construction and transport of loudspeaker cabinets

Publications (1)

Publication Number Publication Date
GB1582183A true GB1582183A (en) 1980-12-31

Family

ID=10227924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2545377A Expired GB1582183A (en) 1978-05-24 1978-05-24 Construction and transport of loudspeaker cabinets

Country Status (1)

Country Link
GB (1) GB1582183A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200014A (en) * 1987-01-15 1988-07-20 Teledyne Ind Enclosure for loudspeaker systems
WO2002082855A2 (en) * 2001-04-05 2002-10-17 New Transducers Limited Loudspeaker
GB2382256A (en) * 2001-11-20 2003-05-21 Ds Smith Collapsible, foldable loudspeaker
WO2004086811A1 (en) * 2003-03-28 2004-10-07 Otto Richter Project Ii Gmbh Loudspeaker body
WO2006095277A1 (en) * 2005-03-08 2006-09-14 Nxp B.V. Loudspeaker enclosure with a closed and an open position
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200014A (en) * 1987-01-15 1988-07-20 Teledyne Ind Enclosure for loudspeaker systems
GB2200014B (en) * 1987-01-15 1990-03-07 Teledyne Ind Enclosure for loudspeaker systems
WO2002082855A2 (en) * 2001-04-05 2002-10-17 New Transducers Limited Loudspeaker
WO2002082855A3 (en) * 2001-04-05 2003-10-16 New Transducers Ltd Loudspeaker
GB2388272B (en) * 2001-04-05 2004-08-25 New Transducers Ltd Loudspeaker
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker
GB2382256A (en) * 2001-11-20 2003-05-21 Ds Smith Collapsible, foldable loudspeaker
WO2004086811A1 (en) * 2003-03-28 2004-10-07 Otto Richter Project Ii Gmbh Loudspeaker body
WO2006095277A1 (en) * 2005-03-08 2006-09-14 Nxp B.V. Loudspeaker enclosure with a closed and an open position

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930524