Patent US3497433A successfully refreshed from Google Patents.
Patent US3608245A successfully refreshed from Google Patents.
Patent US4690244A successfully refreshed from Google Patents.
US4690244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker enclosures
Assignee: B&W Loudspeakers Ltd
•
Filing: 1986-02-06
•
Granted: 1987-09-01
•
Expires: 2006-02-06
Abstract
Abstract A loudspeaker enclosure comprises a rectangular box-like housing (100) consisting of top (102) and bottom walls (104), front and back walls (106), left (108) and right (110) side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure (200) located within the housing (100) and extending from the top wall (102) to the bottom wall (104), from the front wall to the back wall (106), and from the left side wall (108) to the right side wall (110), the hollow stiffening structure (200) comprising a first set of spaced-apart stiffening panels (1,2,3) arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair (102, 104) of opposed housing walls, and a second set of spaced-apart stiffening panels (4,5) arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair (108, 110) of opposed housing walls, the stiffening panels (1,2,3) of the first set being secured to stiffening panels (4,5) of the second set and intersecting the substantially orthogonally so that the stiffening panels, together with the housing walls define a multiplicity of rectangular parallelepipedal cells (250), holes (13,23,33,43,53) being provided in the stiffening panels to provide communication between adjacent cells.
Inventors
- 👤 Laurence G. Dickie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:07
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2869; H04R1/2884; H04R1/2888
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
187 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells.
Claim 2
Dependent Claim
187 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells.
Claim 3
Dependent Claim
34 words
A loudspeaker enclosure as claimed in claim 1, wherein the stiffening panels of at least one of the said sets of stiffening panels are of integral construction and span the interior of the housing.
Claim 4
Dependent Claim
86 words
A loudspeaker enclosure as claimed in claim 2, wherein the stiffening panels of one of the said sets of stiffening panels are of integral construction and span the interior of the housing and the stiffening panels of the other of the said sets of stiffening panels are made up of strips of which some extend between, and are secured to, adjacent panels of the said one set and others extend between, and are secured to panels of the said one set and wall of the housing.
Claim 5
Dependent Claim
54 words
A loudspeaker enclosure as claimed in claim 2, wherein the stiffening panels of both of the said sets of stiffening panels are of integral construction and span the interior of the housing, each stiffening panel including slots, and the slots in the stiffening panels of each set receiving stiffening panels of the other set.
Claim 6
Dependent Claim
18 words
A loudspeaker enclosure as claimed in claim 1, wherein the stiffening panels are secured to the housing walls.
Claim 7
Dependent Claim
22 words
A loudspeaker enclosure as claimed in claim 5, wherein the stiffening panels are secured to the housing walls by means of adhesive.
Claim 8
Dependent Claim
24 words
A loudspeaker enclosure as claimed in claim 6, wherein the adhesive used is one that sets to a rubbery rather than a brittle condition.
Claim 9
Dependent Claim
23 words
A loudspeaker enclosure as claimed in claim 1, wherein edge portions of the stiffening panels are received in grooves in the housing walls.
Claim 10
Dependent Claim
26 words
A loudspeaker enclosure as claimed in claim 1, wherein the cells defined by the stiffening panels, together with the housing walls, are of substantially square cross-section.
Claim 11
Dependent Claim
24 words
A loudspeaker enclosure as claimed in claim 1, wherein each of the said sets of stiffening panels consists of at least three stiffening panels.
Claim 12
Dependent Claim
24 words
A loudspeaker enclosure as claimed in claim 10, wherein one of the said sets of stiffening panels consists of at least five stiffening panels.
Claim 13
Dependent Claim
60 words
A loudspeaker enclosure as claimed in claim 1, wherein the front wall of the enclosure is arranged to receive at least one loudspeaker drive unit and the stiffening panels of one set lie parallel to the side walls of the housing, and the stiffening panels of the other set lie parallel to the top and bottom walls of the housing.
Claim 14
Dependent Claim
193 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart wooden stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart wooden stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the wooden stiffening panels of the first set being secured to the wooden stiffening panels of the second set and intersecting them substantially orthogonally so that the wooden stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the wooden stiffening panels to provide communication between adjacent cells.
Claim 15
Dependent Claim
193 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart wooden stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart wooden stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the wooden stiffening panels of the first set being secured to the wooden stiffening panels of the second set and intersecting them substantially orthogonally so that the wooden stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the wooden stiffening panels to provide communication between adjacent cells.
Claim 16
Dependent Claim
16 words
A loudspeaker enclosure as claimed in claim 13, wherein the stiffening panels are made of hardboard.
Claim 17
Dependent Claim
16 words
A loudspeaker enclosure as claimed in claim 13, wherein the stiffening panels are made of plywood.
Claim 18
Dependent Claim
25 words
A loudspeaker enclosure as claimed in claim 13, wherein the stiffening panels of one set are secured to the stiffening panels of the other set.
Claim 19
Dependent Claim
29 words
A loudspeaker enclosure as claimed in claim 16, wherein the stiffening panel of one set are secured to the stiffening panels of the other set by means of adhesive.
Claim 20
Dependent Claim
24 words
A loudspeaker enclosure as claimed in claim 17, wherein the adhesive used is one that sets to a rubbery, rather than a brittle condition.
Claim 21
Dependent Claim
200 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells and at least the majority of the said cells containing acoustically absorbent material.
Claim 22
Dependent Claim
200 words
A loudspeaker enclosure comprising a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells and at least the majority of the said cells containing acoustically absorbent material.
Claim 23
Dependent Claim
23 words
A loudspeaker enclosure as claimed in claim 19, wherein the acoustically absorbent material is in the form of blocks of open-cell plastics material.
Claim 24
Dependent Claim
27 words
A loudspeaker enclosure as claimed in claim 19 wherein the acoustically absorbent material is in the form of blocks of open-cell polyester foam or open-cell polyether foam.
Claim 25
Dependent Claim
28 words
A loudspeaker enclosure as claimed in claim 19 wherein the acoustically absorbent material is selected from the group consisting of bonded acoustic fibre, waste wool, rockwool or fibreglass.
Claim 26
Dependent Claim
207 words
A loudspeaker system comprising: a loudspeaker enclosure having a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, and a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells; and a loudspeaker drive unit mounted in one of said walls of the housing.
Claim 27
Dependent Claim
207 words
A loudspeaker system comprising: a loudspeaker enclosure having a rectangular box-like housing consisting of top and bottom walls, front and back walls, left and right side walls, each of the walls being formed by a wooden panel, and a hollow stiffening structure located within the housing and extending from the top wall to the bottom wall, from the front wall to the back wall, and from the left side wall to the right side wall, the hollow stiffening structure comprising a first set of spaced apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a pair of opposed housing walls, and a second set of spaced-apart stiffening panels arranged with their planes substantially parallel to each other and substantially parallel to the walls of a different pair of opposed housing walls, the stiffening panels of the first set being secured to the stiffening panels of the second set and intersecting them substantially orthogonally so that the stiffening panels, together with the housing walls, define a multiplicity of rectangular parallepipedal cells, holes being provided in the stiffening panels to provide communication between adjacent cells; and a loudspeaker drive unit mounted in one of said walls of the housing.
Claim 28
Dependent Claim
38 words
A loudspeaker enclosure as claimed in claim 23, wherein the stiffening structure and the inner surfaces of at least those housing walls that do not include a drive unit or drive units, are sprayed with a sound-deadening substance.
Claim 29
Dependent Claim
39 words
A loudspeaker system as claimed in claim 23, wherein a wall of the housing having mounted in it one or more loudspeaker drive units is also provided with a vent so that the loudspeaker enclosure constitutes a Helmholtz resonator.
References Cited (Backward Citations)
US2031500A
Cited
GB483745A
Cited
GB793193A
Cited
US2866514A
Cited
US3696886A
Cited
US3953675A
Cited
US4054748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |