CA1211234A - Seat cushion spring assembly - Google Patents
Seat cushion spring assemblyInfo
- Publication number
- CA1211234A CA1211234A CA000451679A CA451679A CA1211234A CA 1211234 A CA1211234 A CA 1211234A CA 000451679 A CA000451679 A CA 000451679A CA 451679 A CA451679 A CA 451679A CA 1211234 A CA1211234 A CA 1211234A
- Authority
- CA
- Canada
- Prior art keywords
- spring
- cover
- coil spring
- length
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/04—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with spring inlays
- A47C27/06—Spring inlays
- A47C27/063—Spring inlays wrapped or otherwise protected
- A47C27/064—Pocketed springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
- A47C27/20—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays with springs moulded in, or situated in cavities or openings in foamed material
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/02—Seat parts
- A47C7/34—Seat parts with springs in compression, e.g. coiled
Landscapes
- Mattresses And Other Support Structures For Chairs And Beds (AREA)
Abstract
ABSTRACT
A spring assembly for a seat cushion or the like. The assembly consists of a flexible cover and a coil spring. The flexible cover has a pocket proportioned to receive the coil spring. The coil spring comprises a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns. The turns of the spring have a radius generated from the longitudinal axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
A spring assembly for a seat cushion or the like. The assembly consists of a flexible cover and a coil spring. The flexible cover has a pocket proportioned to receive the coil spring. The coil spring comprises a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns. The turns of the spring have a radius generated from the longitudinal axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
Description
3~
This invention relates to spring cushions~ In particular, this invention relates -to spring cushions in which pocket springs are located.
PRIOR ART
For many years, springs which are used in upholstered furniture have been located in a pocket of a fabric cover to prevent direct contact between the wire body of the spring and the surrounding seat. The cover which has conventionally been used as a simple cheesecloth cover serves to protect the surrounding fabric of the cushion and provide increased wear characteristics to the cushion. ~he covers themselves are, however, subject to wear and when worn -through, the spring can make contact with the fabric of the seat and ultimately wear through the fabric of the seat.
To avoid any reduction in the effectiveness of the spring, it is necessary to avoid the use of a heavy fabric cover and consequently, the difficulties which are being experienced as a result of wear of the cover cannot be effectively overcome merely by using a heavier cover.
I have found that I can retain the lightweight cover which is conventionally used and increase the useful life of the spring assembly by designing the spring so that it does not nip or pinch the cover when it is compressed.
This invention relates to spring cushions~ In particular, this invention relates -to spring cushions in which pocket springs are located.
PRIOR ART
For many years, springs which are used in upholstered furniture have been located in a pocket of a fabric cover to prevent direct contact between the wire body of the spring and the surrounding seat. The cover which has conventionally been used as a simple cheesecloth cover serves to protect the surrounding fabric of the cushion and provide increased wear characteristics to the cushion. ~he covers themselves are, however, subject to wear and when worn -through, the spring can make contact with the fabric of the seat and ultimately wear through the fabric of the seat.
To avoid any reduction in the effectiveness of the spring, it is necessary to avoid the use of a heavy fabric cover and consequently, the difficulties which are being experienced as a result of wear of the cover cannot be effectively overcome merely by using a heavier cover.
I have found that I can retain the lightweight cover which is conventionally used and increase the useful life of the spring assembly by designing the spring so that it does not nip or pinch the cover when it is compressed.
2~
3'~
According to one aspect of the present invention, a spring assembly for a seat cushion or the like which comprises a flexible cover having a wall defining a pocket proportioned to receive one coil spring, and a coil spring comprising; a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns, the turns of said spring having a radius generated from said axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another, said coil spring being located in said pocket of said cover, the radial spacing of said turns of the compression spring being sufficient to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
The invention will be more clearly understood after reference to the following detailed specification read in conjunction with the drawings wherein;
Figure 1 is an exploded view of a seat cushion constructed in accordance with an embodiment of the present invention, Figure 2 is a partially sectioned view of a coil spring enclosed ln a cover in accordance with an embodiment of the present invention, Figure 3 is a sectional side view of the spring of Figure 2 in a partially compressed configuration.
~Xll~
With reference to Figure 1 of the drawings, the reference numeral 10 refers ~enerally to a cushion construc-ted in accordance with an embodiment of the present inventionO The cushion comprises a central body portion 12 and a pair of end panels 14. A plurality of circular passages 16 extend through the central body portion 12 and a spring assembly 18 is located in each passage 16.
The spring assembly 18 comprises a coil spring 20 and a fabric cover 22. The coil spring 20 co~prises a single leng-th of wire 24 in which is wound upon itself and which has a radius of revolution Rl generated from the axis R which varies continuously over the full length of the spring such that it i5 at a maximum radius Rl substantially centrally of the length of the spring, ~he radius decreasing progressively from each side of the center of the length of the spring toward each end convolution.
As a result of this structure, when the spring is compressed as shown in Figure 3, a narrow gap will always exist between adjacent turns of the spring. This narrow gap provides a space into which the cover 22 may buckle without being pinched between the adjacent turns of the spring.
I have found that this spring configuration serves to reduce wear and tear on the cover which in turn, reduces wear and tear on the structure of the cushion.
The spring 20 is located in the pocket 21 of the cover 22 so as to be completely enclosed by the cover 22.
l~ L~L
The spring ~0 is made from a single length of spring steel and the cover 22 .is preferably made from a conventional cover forming material such as cheesecloth or the like.
These and other advantages of the spring assembly of the present .invention will be apparent to those skilled in -the art.
According to one aspect of the present invention, a spring assembly for a seat cushion or the like which comprises a flexible cover having a wall defining a pocket proportioned to receive one coil spring, and a coil spring comprising; a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns, the turns of said spring having a radius generated from said axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another, said coil spring being located in said pocket of said cover, the radial spacing of said turns of the compression spring being sufficient to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
The invention will be more clearly understood after reference to the following detailed specification read in conjunction with the drawings wherein;
Figure 1 is an exploded view of a seat cushion constructed in accordance with an embodiment of the present invention, Figure 2 is a partially sectioned view of a coil spring enclosed ln a cover in accordance with an embodiment of the present invention, Figure 3 is a sectional side view of the spring of Figure 2 in a partially compressed configuration.
~Xll~
With reference to Figure 1 of the drawings, the reference numeral 10 refers ~enerally to a cushion construc-ted in accordance with an embodiment of the present inventionO The cushion comprises a central body portion 12 and a pair of end panels 14. A plurality of circular passages 16 extend through the central body portion 12 and a spring assembly 18 is located in each passage 16.
The spring assembly 18 comprises a coil spring 20 and a fabric cover 22. The coil spring 20 co~prises a single leng-th of wire 24 in which is wound upon itself and which has a radius of revolution Rl generated from the axis R which varies continuously over the full length of the spring such that it i5 at a maximum radius Rl substantially centrally of the length of the spring, ~he radius decreasing progressively from each side of the center of the length of the spring toward each end convolution.
As a result of this structure, when the spring is compressed as shown in Figure 3, a narrow gap will always exist between adjacent turns of the spring. This narrow gap provides a space into which the cover 22 may buckle without being pinched between the adjacent turns of the spring.
I have found that this spring configuration serves to reduce wear and tear on the cover which in turn, reduces wear and tear on the structure of the cushion.
The spring 20 is located in the pocket 21 of the cover 22 so as to be completely enclosed by the cover 22.
l~ L~L
The spring ~0 is made from a single length of spring steel and the cover 22 .is preferably made from a conventional cover forming material such as cheesecloth or the like.
These and other advantages of the spring assembly of the present .invention will be apparent to those skilled in -the art.
Claims (3)
1. A spring assembly for a seat cushion or the like comprising:
a) a flexible cover having a wall defining a pocket proportioned to receive one coil spring, and b) a coil spring comprising;
a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns, the turns of said spring having a radius generated from said axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another, said coil spring being located in said pocket of said cover, the radial spacing of said turns of the compression spring being sufficient to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
a) a flexible cover having a wall defining a pocket proportioned to receive one coil spring, and b) a coil spring comprising;
a length of wire wound upon itself about a longitudinal axis to form an open coil spring having a plurality of turns, the turns of said spring having a radius generated from said axis which varies continuously along the length of the spring and is a maximum at the center of the length of the spring and decreases progressively toward each end of the spring such that, upon compression of the spring adjacent turns are radially spaced from one another, said coil spring being located in said pocket of said cover, the radial spacing of said turns of the compression spring being sufficient to provide clearance therebetween to accommodate buckling of the wall of the cover without pinching of the cover therebetween.
2. A spring assembly for a seat cushion or the like comprising:
a) a flexible cover having wall defining a pocket proportioned to receive one coil spring, b) a coil spring comprising;
a length of wire wound upon itself to form a coil spring which has at least one open central convolution and end convolutions extending from opposite ends of the central convolution, said spring being located in said pocket of said cover, the radius of said convolutions decreasing progressively from the center of the central convolution toward each end of the spring such that upon compression of the spring, adjacent convolutions are radially spaced from one another to provide clearance therebetween to accommodate buckled portions of the wall of the cover therebetween without damage to the wall of the cover in use.
a) a flexible cover having wall defining a pocket proportioned to receive one coil spring, b) a coil spring comprising;
a length of wire wound upon itself to form a coil spring which has at least one open central convolution and end convolutions extending from opposite ends of the central convolution, said spring being located in said pocket of said cover, the radius of said convolutions decreasing progressively from the center of the central convolution toward each end of the spring such that upon compression of the spring, adjacent convolutions are radially spaced from one another to provide clearance therebetween to accommodate buckled portions of the wall of the cover therebetween without damage to the wall of the cover in use.
3. A cushion for a seat comprising:
a) a body of foamed plastic material having a plurality of spring chambers formed therein, b) a spring assembly in each of said chambers, said spring assembly comprising;
i) a flexible cover having wall defining a pocket proportioned to receive one coil spring, ii) a coil spring comprising;
a length of wire wound upon itself to form a coil spring which has at least one open central convolution and end convolutions extending from opposite ends of the central convolution, said spring being located in said pocket of said cover, the radius of said convolutions decreasing progressively from the center of the central convolution toward each end of the spring such that upon compression of the spring, adjacent convolutions are radially spaced from one another to provide clearance therebetween to accommodate buckled portions of the wall of the cover therebetween without damage to the wall of the cover in use.
a) a body of foamed plastic material having a plurality of spring chambers formed therein, b) a spring assembly in each of said chambers, said spring assembly comprising;
i) a flexible cover having wall defining a pocket proportioned to receive one coil spring, ii) a coil spring comprising;
a length of wire wound upon itself to form a coil spring which has at least one open central convolution and end convolutions extending from opposite ends of the central convolution, said spring being located in said pocket of said cover, the radius of said convolutions decreasing progressively from the center of the central convolution toward each end of the spring such that upon compression of the spring, adjacent convolutions are radially spaced from one another to provide clearance therebetween to accommodate buckled portions of the wall of the cover therebetween without damage to the wall of the cover in use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000451679A CA1211234A (en) | 1984-04-10 | 1984-04-10 | Seat cushion spring assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000451679A CA1211234A (en) | 1984-04-10 | 1984-04-10 | Seat cushion spring assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211234A true CA1211234A (en) | 1986-09-09 |
Family
ID=4127620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000451679A Expired CA1211234A (en) | 1984-04-10 | 1984-04-10 | Seat cushion spring assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1211234A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2633565A1 (en) * | 1988-06-29 | 1990-01-05 | Daimler Benz Ag | VEHICLE SEAT COMPRISING AN ELASTIC CORE BASED ON A LOWER CHASSIS |
| EP0629369A1 (en) * | 1993-06-18 | 1994-12-21 | Giancarlo Mariani | Flexible cushion particularly for armchairs, couches and pieces of furniture in general |
| FR2737096A1 (en) * | 1995-07-26 | 1997-01-31 | Simmons Cie Continentale | Mattress with springs held in foam plate - has pocketed springs held in calls of upper foam plate and cells closed by lower plate fixed to upper plate |
| WO2010110732A1 (en) * | 2009-03-25 | 2010-09-30 | Malmstolen Ab | Seat backrest |
| CN102631093A (en) * | 2011-02-11 | 2012-08-15 | 许汉忠 | Seat |
-
1984
- 1984-04-10 CA CA000451679A patent/CA1211234A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2633565A1 (en) * | 1988-06-29 | 1990-01-05 | Daimler Benz Ag | VEHICLE SEAT COMPRISING AN ELASTIC CORE BASED ON A LOWER CHASSIS |
| EP0629369A1 (en) * | 1993-06-18 | 1994-12-21 | Giancarlo Mariani | Flexible cushion particularly for armchairs, couches and pieces of furniture in general |
| FR2737096A1 (en) * | 1995-07-26 | 1997-01-31 | Simmons Cie Continentale | Mattress with springs held in foam plate - has pocketed springs held in calls of upper foam plate and cells closed by lower plate fixed to upper plate |
| WO2010110732A1 (en) * | 2009-03-25 | 2010-09-30 | Malmstolen Ab | Seat backrest |
| CN102631093A (en) * | 2011-02-11 | 2012-08-15 | 许汉忠 | Seat |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |