US2316628A - Laminated flexwood spring for chair seats - Google Patents

Laminated flexwood spring for chair seats Download PDF

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Publication number
US2316628A
US2316628A US443249A US44324942A US2316628A US 2316628 A US2316628 A US 2316628A US 443249 A US443249 A US 443249A US 44324942 A US44324942 A US 44324942A US 2316628 A US2316628 A US 2316628A
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Prior art keywords
spring
leaves
spring member
flexwood
laminated
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Expired - Lifetime
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US443249A
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Alvin J Schaffner
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Kroehler Manufacturing Co
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Kroehler Manufacturing Co
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Priority to US443249A priority Critical patent/US2316628A/en
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    • 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
    • A47C7/025—Springs not otherwise provided for in A47C7/22 - A47C7/35
    • A47C7/028—Springs not otherwise provided for in A47C7/22 - A47C7/35 with wooden springs, e.g. slated type

Definitions

  • This invention relates to a laminated flexwood spring for chair-seats and consists of the matters hereinafter describe and more particularly pointed out in the appendedclaims.
  • the object of the invention is to provide a novel and improved leaf spring construction made of laminated wood or flexwood which may be readily applied to a chair seat and which will give to said seat the required resilient flexibility heretofore provided by the use .ofsteel coiled .or other steel springs.
  • Another object of the invention is to provide a construction of chair seat, including flexwood springs, which is capable of ready and easy assembly and which may be produced .at a small cost.
  • Another object of the invention is to provide a flexwood spring unit which is so assembled and so applied to the frame by which it iscarried that it has no .fixed anchorage and will give free movement.
  • Figure 1 is a perspectiveview of a chairof any familiar construction, with the .seat upholstered in the usual manner and containingtheimproved flexwood spring of the invention.
  • Figure 2 is a vertical section, in a plane indicated by the line 2-2 of Figurel, with the outline of the upholstery of the seat indicated by dotted lines.
  • Figure 3 is a perspective view of the spring unit.
  • Figure 4 is a perspective view of a pair of the upper and lower leaves of the flexwoodspring unit shown applied to the front and back rails .of the seat of th chair.
  • Figure 5 is a top plan view of the spring unit shown in Figure 3 in perspective.
  • Figure 6 in view representing a section through Figure 5 in a plane indicated by the line 6-6 in Figure 5.
  • Figure 7 is a view representing a section through Figure 6 in a plane indicated by the line 1-1 of Figure 6.
  • Figure 8 is a front elevation of the spring unit shown in Figure 5.
  • Figure 9 is a view representing a section through Figure 6 in a plane indicated by the line 99 of Figure 6. s
  • Figure 10 is a rear elevation of the spring unit as shown in Figure 5.
  • ll indicates the seat of a chair mad of wood in the usual manner.
  • I2 indicates the front rail
  • i3 indicates the back rail of the chair seat.
  • I4 indicates the spring unit.
  • Said springunit comprises an upper member l5 and a lower member 15.
  • the upperspring member l5 consists of a plurality .of laterally spaced parallel flexwood spring leaves l5 attached at their rear ends to a depending rocker bar I! which extends transversely of said leaves and are attached at their front ends to a flat plywoodstrip l8 extending transversely across their top faces.
  • the lower spring member It consists of a plurality of laterally spaced parallel flexwood spring leaves I 6 attached at their front ends. to a depending rocker 'bar I 9 which extends transversely of and depends below said leaves.
  • Each spring .member contains .a like number of leaves, :and the leaves .of the upper member are disposed upon and engage theleaves of the lower member.
  • the leaves l5 .of the upper spring member are formed with a slight downward curvature.
  • the vspringe leaves l6? of the lower spring member are straight at the ends, but are formed with a reverse curve towards the main body of the .leaf which is straight and is incontact with an associated leaf Iii of the upper spring .member as clearlyshown. in- Figures 2, .3 and 4.
  • the leaves 1.6! of the lower spring member are extended somewhat. beyond the, rocker bar i! of the upper spring member as shown in Figures 2 and 3.
  • the front rail l2 of thechair seat is provided at .its upper edge with a rounded groove 20 in which .seats the rocker bar i9 which has a correspondingly transversely rounded bottom edge 13*. 1
  • the rearrail ,l3 of the chair seat is provided with a plurality of slots 2
  • the back rail of the chair seat is formed in two pieces l3, Iii disposed edge to edge, one upon the other, and one or the other, the upper piece as shown, is notched to provide, together with the proximate edge of the other piece, the slots 2
  • the rocker bar I1 has a rounded bottom ll and rests in one or more notched cradle blocks 22 disposed between the slots 2
  • the spring unit is capable of a free rocking movement upon the front seat rail I2 and also on the back rail l3, such movement being permitted by the fact that the ends W of the leaves of the bottom spring member l6 extend through the slots 2
  • a paper cord 23 is attached to the fiexwood strip I8 at the front end of the upper spring member, as shown in Figure 2. This provides a seat roll to support and round out the cover sheet of the'upholstery at the front edge of the seat.
  • Straight grain woods and semi-flexible waterproof glue are used in the manufacture of the laminated spring leaves. They are given the required form or shape and are so treated in a familiar manner, that when finished they will maintain their shape and form equally as well as similar springs manufactured from steel.
  • a laminated fiexwood spring construction comprised of upper and lower members, each having a like number of laterally spaced flex wood spring leaves, the leaves of the upper spring member ⁇ being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depend ing rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, and a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member.
  • a laminated fiexwood spring construction comprising an open frame having front and back rails, a spring unit comprised of upper and. lowermembers each having a like number of laterally spaced fiexwood spring leaves, the leaves of the upper springmember being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent up wardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member, and means on said frame providing seats for said rocker bars, and said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project,
  • a laminated flexwood spring chair seat construction comprising an open chair seat frame having front and back rails, a spring unit comprised of upper and lower members each having a like number of laterally spaced flexwood spring leaves, the leaves of the upper spring member being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member, and said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project.
  • Alaminated fiexwood spring chair seat construction comprising an open chair seat frame having front and back rails, a spring unit comprised of upper and lower members each having a like number of laterally spaced flexwood spring leaves, the leaves of the upper spring member being bent downwardly intermediate their ends, and. the leavesof the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed tothe rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends .of the leaves of the upper spring member, the
  • said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project, the

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  • Special Chairs (AREA)

Description

April 13 1943. A, J. SCHAFFNER LAMINATED FLEXWOOD :SPRING FOR CHAIR SEATS 2 Sheets-Sheet 1 Filed May 16, 1942 P 1943- A. J. SCHAFFNER 2,316,628 Lmxm'mnimaxwobn SPRING FOR CHAIR SEATS Filed May 16, 1942 2 Sheets-Sheet 2 Patented Apr. 13, 1943 LAMINATED FLEXWOOD SPRING FOR CHAIR SEATS Alvin J. Schaffner, Aurora, Ill., assignor to Kroehler Mfg. 00., Naperville, 111., a corporation of Illinois ApplicationMaylfi, 1942, Serial No. 443,249
4 Claims.
This invention relates to a laminated flexwood spring for chair-seats and consists of the matters hereinafter describe and more particularly pointed out in the appendedclaims.
The object of the invention is to provide a novel and improved leaf spring construction made of laminated wood or flexwood which may be readily applied to a chair seat and which will give to said seat the required resilient flexibility heretofore provided by the use .ofsteel coiled .or other steel springs.
Another object of the invention is to provide a construction of chair seat, including flexwood springs, which is capable of ready and easy assembly and which may be produced .at a small cost.
Another object of the invention is to provide a flexwood spring unit which is so assembled and so applied to the frame by which it iscarried that it has no .fixed anchorage and will give free movement.
The advantages of the invention will appear more fully as I proceed with my specification.
In the drawings:
Figure 1 is a perspectiveview of a chairof any familiar construction, with the .seat upholstered in the usual manner and containingtheimproved flexwood spring of the invention.
Figure 2 is a vertical section, in a plane indicated by the line 2-2 of Figurel, with the outline of the upholstery of the seat indicated by dotted lines.
Figure 3 is a perspective view of the spring unit.
Figure 4 is a perspective view of a pair of the upper and lower leaves of the flexwoodspring unit shown applied to the front and back rails .of the seat of th chair.
Figure 5 is a top plan view of the spring unit shown in Figure 3 in perspective.
Figure 6 in view representing a section through Figure 5 in a plane indicated by the line 6-6 in Figure 5.
Figure 7 is a view representing a section through Figure 6 in a plane indicated by the line 1-1 of Figure 6.
Figure 8 is a front elevation of the spring unit shown in Figure 5.
Figure 9 is a view representing a section through Figure 6 in a plane indicated by the line 99 of Figure 6. s
Figure 10 is a rear elevation of the spring unit as shown in Figure 5.
Referring now to that embodiment of the invention illustrated in the drawings: ll indicates the seat of a chair mad of wood in the usual manner. I2 indicates the front rail, and i3 indicates the back rail of the chair seat. I4 indicates the spring unit. Said springunit comprises an upper member l5 and a lower member 15. The upperspring member l5 consists of a plurality .of laterally spaced parallel flexwood spring leaves l5 attached at their rear ends to a depending rocker bar I! which extends transversely of said leaves and are attached at their front ends to a flat plywoodstrip l8 extending transversely across their top faces. The lower spring member It consists of a plurality of laterally spaced parallel flexwood spring leaves I 6 attached at their front ends. to a depending rocker 'bar I 9 which extends transversely of and depends below said leaves. Each spring .member contains .a like number of leaves, :and the leaves .of the upper member are disposed upon and engage theleaves of the lower member.
'The leaves l5 .of the upper spring member are formed with a slight downward curvature. The vspringe leaves l6? of the lower spring member are straight at the ends, but are formed with a reverse curve towards the main body of the .leaf which is straight and is incontact with an associated leaf Iii of the upper spring .member as clearlyshown. in- Figures 2, .3 and 4. The leaves 1.6! of the lower spring member are extended somewhat. beyond the, rocker bar i! of the upper spring member as shown in Figures 2 and 3.
The front rail l2 of thechair seat is provided at .its upper edge with a rounded groove 20 in which .seats the rocker bar i9 which has a correspondingly transversely rounded bottom edge 13*. 1
The rearrail ,l3 of the chair seat is provided with a plurality of slots 2| laterally spaced to correspond with the ,spacing'of theleaves [6 of the bottom spring member, the rear ends 16 of which leaves extend through said slots when the spring assembly is mounted on the chair seat frame. As shown, the back rail of the chair seat is formed in two pieces l3, Iii disposed edge to edge, one upon the other, and one or the other, the upper piece as shown, is notched to provide, together with the proximate edge of the other piece, the slots 2|.
The rocker bar I1 has a rounded bottom ll and rests in one or more notched cradle blocks 22 disposed between the slots 2| and fixed to the inside face of the back seat rail l3. Thus the spring unit is capable of a free rocking movement upon the front seat rail I2 and also on the back rail l3, such movement being permitted by the fact that the ends W of the leaves of the bottom spring member l6 extend through the slots 2|, and that the front ends of the spring leaves l are free as shown in Figures 2 and 6.
A paper cord 23 is attached to the fiexwood strip I8 at the front end of the upper spring member, as shown in Figure 2. This provides a seat roll to support and round out the cover sheet of the'upholstery at the front edge of the seat.
From the foregoing description it will be obvious to those familiar with the art that the novel flexwood spring unit will provide the required elasticity and great freedom of movement without any fixed anchorage.
Straight grain woods and semi-flexible waterproof glue are used in the manufacture of the laminated spring leaves. They are given the required form or shape and are so treated in a familiar manner, that when finished they will maintain their shape and form equally as well as similar springs manufactured from steel.
While in describing my invention I have shown it as applied to a chair seat frame, it is to be understood that the invention is not limited thereto since it may be applied to other frames where its construction and operation may be required.
I claim as my invention:
1. A laminated fiexwood spring construction comprised of upper and lower members, each having a like number of laterally spaced flex wood spring leaves, the leaves of the upper spring member {being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depend ing rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, and a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member.
2. A laminated fiexwood spring construction comprising an open frame having front and back rails, a spring unit comprised of upper and. lowermembers each having a like number of laterally spaced fiexwood spring leaves, the leaves of the upper springmember being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent up wardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member, and means on said frame providing seats for said rocker bars, and said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project,
3. A laminated flexwood spring chair seat construction comprising an open chair seat frame having front and back rails, a spring unit comprised of upper and lower members each having a like number of laterally spaced flexwood spring leaves, the leaves of the upper spring member being bent downwardly intermediate their ends, and the leaves of the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed to the rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends of the leaves of the upper spring member, the leaves of said bottom spring member extending beyond the rocker bar of the upper member, and said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project.
4. Alaminated fiexwood spring chair seat construction comprising an open chair seat frame having front and back rails, a spring unit comprised of upper and lower members each having a like number of laterally spaced flexwood spring leaves, the leaves of the upper spring member being bent downwardly intermediate their ends, and. the leavesof the bottom spring member being bent upwardly intermediate their ends into engagement with associated spring leaves of the upper spring member, a depending rocker bar fixed tothe rear end of the upper spring member, a second depending rocker bar fixed to the front end of the bottom spring member, a strip attached to and extending transversely of the ends .of the leaves of the upper spring member, the
leaves of said bottom spring member extending beyond the rocker bar of the upper member,
said back rail being provided with laterally spaced slots through which the rear ends of the leaves of said bottom spring member project, the
.topedg'e of said front rail being grooved to seat the rocker bar of said bottom frame, and a cradle fixed to said back rail providing a seat for the rocker bar of said top spring member.
ALVIN J. SCHAFFNER.
US443249A 1942-05-16 1942-05-16 Laminated flexwood spring for chair seats Expired - Lifetime US2316628A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693848A (en) * 1952-07-24 1954-11-09 Gen Tire & Rubber Co Spring-cushioned chair seat
US2745472A (en) * 1951-10-10 1956-05-15 American Metal Prod Zigzag spring cushion having central support
US5269497A (en) * 1990-12-17 1993-12-14 Flexsteel Industries, Inc. Seat spring structure
US6547206B1 (en) * 2000-09-29 2003-04-15 Sunrise Medical Hhg Inc. Seat suspension for wheelchair
US20040012233A1 (en) * 2002-07-19 2004-01-22 Branscomb David A. Snowmobile seat
US20040051358A1 (en) * 2002-09-12 2004-03-18 Bodnar David A. Control mechanism for seating unit
US20050029848A1 (en) * 2002-09-12 2005-02-10 Heidmann Kurt R. Seating unit having motion control
US20060071522A1 (en) * 2003-06-05 2006-04-06 Steelcase Development Corporation Control for seating unit with back stop
US20080106134A1 (en) * 2006-04-28 2008-05-08 Heidmann Kurt R Seat suspension and method of manufacture
EP2002759A1 (en) * 2007-06-15 2008-12-17 Imre Dr. Szabó Energy storing spring from wood
US7837273B1 (en) * 2003-08-25 2010-11-23 Milsco Manufacturing Company Seat suspension
US9560917B2 (en) 2014-11-26 2017-02-07 Steelcase Inc. Recline adjustment system for chair
US9839295B2 (en) 2014-04-24 2017-12-12 Ashley Furniture Industries, Inc. Drop in seat deck for furniture assemblies
US20180235367A1 (en) * 2017-02-22 2018-08-23 Aeris Gmbh Active dynamic seating furniture
US20220079347A1 (en) * 2019-02-15 2022-03-17 The Lovesac Company Furniture spring system
US11452379B1 (en) * 2021-05-10 2022-09-27 Nicholas M Salazar Meditation chair
US20220354263A1 (en) * 2021-05-10 2022-11-10 Nicholas M. Salazar Meditation Chair
US11659936B2 (en) 2019-02-15 2023-05-30 The Lovesac Company Modular furniture support systems
US12364338B2 (en) 2019-02-15 2025-07-22 The Lovesac Company Modular furniture support systems

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745472A (en) * 1951-10-10 1956-05-15 American Metal Prod Zigzag spring cushion having central support
US2693848A (en) * 1952-07-24 1954-11-09 Gen Tire & Rubber Co Spring-cushioned chair seat
US5269497A (en) * 1990-12-17 1993-12-14 Flexsteel Industries, Inc. Seat spring structure
US6547206B1 (en) * 2000-09-29 2003-04-15 Sunrise Medical Hhg Inc. Seat suspension for wheelchair
US6883866B2 (en) * 2002-07-19 2005-04-26 David A. Branscomb Flexible seat
US20040012233A1 (en) * 2002-07-19 2004-01-22 Branscomb David A. Snowmobile seat
WO2004023934A3 (en) * 2002-09-12 2007-07-19 Steelcase Dev Corp Control mechanism for seating unit
US20060170263A1 (en) * 2002-09-12 2006-08-03 Heidmann Kurt R Synchrotilt seating unit with comfort surface
US20040245840A1 (en) * 2002-09-12 2004-12-09 Tubergen Renard G. Seating with comfort surface
US20050029848A1 (en) * 2002-09-12 2005-02-10 Heidmann Kurt R. Seating unit having motion control
US6869142B2 (en) 2002-09-12 2005-03-22 Steelcase Development Corporation Seating unit having motion control
US6880886B2 (en) 2002-09-12 2005-04-19 Steelcase Development Corporation Combined tension and back stop function for seating unit
US20040245827A1 (en) * 2002-09-12 2004-12-09 Bedford Adam C. Combined tension and back stop function for seating unit
US6932430B2 (en) 2002-09-12 2005-08-23 Steelcase Development Corporation Combined tension and back stop function for seating unit
US6957863B2 (en) 2002-09-12 2005-10-25 Steelcase Development Corporation Seating unit having motion control
US20060055220A1 (en) * 2002-09-12 2006-03-16 Heidmann Kurt R Seating unit with novel flexible supports
US20040245839A1 (en) * 2002-09-12 2004-12-09 Bodnar David A. Combined tension and back stop function for seating unit
AU2003272280B2 (en) * 2002-09-12 2009-01-08 Steelcase Inc. Control mechanism for seating unit
US7165811B2 (en) 2002-09-12 2007-01-23 Steelcase Development Corporation Control mechanism for seating unit
US20070114827A1 (en) * 2002-09-12 2007-05-24 Bodnar David A Control mechanism for seating unit
US7226130B2 (en) 2002-09-12 2007-06-05 Steelcase Development Corporation Seating with comfort surface
US7234774B2 (en) 2002-09-12 2007-06-26 Steelcase Development Corporation Seating unit with novel flexible supports
US20040051358A1 (en) * 2002-09-12 2004-03-18 Bodnar David A. Control mechanism for seating unit
US7264311B2 (en) 2002-09-12 2007-09-04 Steelcase Development Corporation Synchrotilt seating unit with comfort surface
US20070228800A1 (en) * 2002-09-12 2007-10-04 Tubergen Renard G Seating with comfort surface
KR100779809B1 (en) 2002-09-12 2007-11-27 스틸케이스 디벨럽먼트 코포레이션 Control mechanism for seating unit
US7360835B2 (en) 2002-09-12 2008-04-22 Steelcase Inc. Seating with comfort surface
US20060071522A1 (en) * 2003-06-05 2006-04-06 Steelcase Development Corporation Control for seating unit with back stop
US7568763B2 (en) 2003-06-05 2009-08-04 Steelcase Inc. Control for seating unit with back stop
US7837273B1 (en) * 2003-08-25 2010-11-23 Milsco Manufacturing Company Seat suspension
US20080106134A1 (en) * 2006-04-28 2008-05-08 Heidmann Kurt R Seat suspension and method of manufacture
US20100127551A1 (en) * 2006-04-28 2010-05-27 Heidmann Kurt R Seat suspension and method of manufacture
US7926880B2 (en) 2006-04-28 2011-04-19 Steelcase Inc. Seat suspension and method of manufacture
EP2002759A1 (en) * 2007-06-15 2008-12-17 Imre Dr. Szabó Energy storing spring from wood
US9839295B2 (en) 2014-04-24 2017-12-12 Ashley Furniture Industries, Inc. Drop in seat deck for furniture assemblies
US9560917B2 (en) 2014-11-26 2017-02-07 Steelcase Inc. Recline adjustment system for chair
US20180235367A1 (en) * 2017-02-22 2018-08-23 Aeris Gmbh Active dynamic seating furniture
US10531739B2 (en) * 2017-02-22 2020-01-14 Aeris Gmbh Active dynamic seating furniture
US20220079347A1 (en) * 2019-02-15 2022-03-17 The Lovesac Company Furniture spring system
US11659936B2 (en) 2019-02-15 2023-05-30 The Lovesac Company Modular furniture support systems
US11659933B2 (en) * 2019-02-15 2023-05-30 The Lovesac Company Furniture spring system
US12364338B2 (en) 2019-02-15 2025-07-22 The Lovesac Company Modular furniture support systems
US11452379B1 (en) * 2021-05-10 2022-09-27 Nicholas M Salazar Meditation chair
US20220354263A1 (en) * 2021-05-10 2022-11-10 Nicholas M. Salazar Meditation Chair

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