US2708476A

US2708476A - Furniture frame construction

Info

Publication number: US2708476A
Application number: US324518A
Authority: US
Inventors: Eames Charles
Original assignee: HERMAN MILLER FURNITURE COMPAN
Current assignee: HERMAN MILLER FURNITURE Co; HERMAN MILLER FURNITURE COMPAN
Priority date: 1952-12-06
Filing date: 1952-12-06
Publication date: 1955-05-17
Anticipated expiration: 1972-05-17

Description

May 17, 1955 c. EAMES 2,708,476 FURNITURE FRAME CONSTRUCTION Filed Dec. 6, 1952 3 Sheets-Sheet l INVENTOR MARLEY 7 AM$ BY uj, 'fwui ATTORNEYS May 17, 1955 c. EAMES mam-rum FRAME cousmucnou 3 Sheets-Sheet 2 'F'iled Dec. 6, 1952 FIG.

FIG. 6.

FIG. 5.

FIG. 9.

FIG.

INVENTOR 0564 9459 [4M5 @LJMVML: *dZ-Am ATTORNEYS May 17, 1955 c. EAMES 2,708,476 FURNITURE FRAME CONSTRUCTION Filed Dec. 6; 1952 l 3 Sheets-Sheet 3 ATTORNEYS United States Patent '0 2,708,476 FURNITURE FRAME CONSTRUCTION Charles Earnes, Santa Monica, Calif., assignor to The Herman Miller Furniture Company, Zeeland, Mich., a corporation of Michigan Application December 6, 1952, Serial No. 324,518 6 Claims. (Cl. 155-187) The present invention relates to an improvement in metal furniture frames and method of making the same. An object of said invention has been to produce a lightweight steel wire shell or frame for chairs, or the like, which will have inherent curved contours conforming generally to body contours of persons in sitting or reclining positions thereon. A further object has been to provide a lightweight metal shell or furniture frame which is particularly well adapted for use withpre-formed inherently contoured upholstery of a readily attachable and detachable type. A further object has been to provide a frame of the character indicated and which may conveniently and advantageously be mounted or supported upon bases of widely varied materials, construction, and designs. .A further object has been to provide a type offurniture frame which can be nested one upon another and shipped with substantial economy, both in packing and shipping, over other types of furniture.

An object of the present invention, so far as it involves method, is to provide procedures whereby wire mesh skeleton furniture frames or shells can be made advantageously under mass production conditions. It is also contemplated that said method, as applied to said product, insures uniformly effective results in the durability and appearance thereof. 7 g

Further objects of and advantages inherent inthe present invention will in part appear from the following specification and theap pen ded drawings wherein:

Figure l is a view in perspective of a chair frame embodying my invention;

Figure 2, a side elevation thereof;

Figure 3, a front elevation thereof;

Figure 4, a bottom plan view thereof;

Figure 5, a view in perspective showing an initial arrangement of crossed lengths of wire stock welded together at their intersections to form a fiat intermediate grid or mesh;

Figure 6, a view in perspective of said grid after deformation by drawing and pressure;

Figure 7, a view in perspective of said initial grid with additional cross wires welded to the longitudinal wires at both sides of the deformed grid to form a seat grid and a back grid;

Figure 8, a view in perspective of the assembled wires with the back grid deformed;

Figure 9, a view in perspective of the assembled wires with the seat grid deformed;

Figure 10, a view in perspective with parts in exploded relation illustrating the peripheral wires and the fastening ring;

Figure 11, an enlarged fragmentary view partly in section on the line 11-11 of Figure 3;

Figure 12, an enlarged fragmentary view partly in section on the line 1212 of Figure 2; and

Figure 13 is an enlarged fragmentary view partly in section on the line 13-13 of Figure 4.

The invention, so far as it relates to a skeleton type metal furniture frame or shell construction, resides in a combination wherein a plurality of lengths of wire arranged in crossed relation with another plurality of lengths of wire and welded thereto at their intersections provide a mesh or grid-like body support with portions of the mesh distorted to form compound curved sectional contours conforming in general to body contours of a person in seated or reclining position thereon, and. a perimeter wire or rim member extends acrossand is welded to end portions of said lengths of wire.

The method of the present invention includes the steps of welding intermediate portions of cross wires to intermediate portions of longitudinal wires to form a flat mesh or grid, applying die pressure to said flat mesh to draw or elongate portions of the wires thereof and distort the same to form a mesh of compound curved sectional contour, welding additional sets of cross wires to other portions or" said longitudinal wires to form a flat seat mesh portion and a flat back mesh portion, andapplying deforming die pressure to said additional flat portions to produce back and seat mesh portions having inherent compound curved sectional contours.

One form of furniture frame according to the present invention and as shown in the drawings, includes a com posite body-supporting element or shell formed primarily of metal strands, as wire or rod stock, and having inherent body-conforming contours. Such a shell comprises longitudinal wires 1 and transverse wires 2 preferably of 10 gauge steel wire with intermediate portions of Wires 1 arranged across and welded to intermediate portions of wires 2, as at 12, Figures 11 and 12, to form a mesh or grid of compound curved contours. End portions of said wires are secured, as by welding, to a metal rim consisting of an upper wire member 3 and a lower wire member 4,

Figures 1 and 2, both preferably of 5 gauge steel wire, welded to the mesh-forming wires at 5, Figurev 11. A shell construction intended more particularly for use as a chair frame, includes a curved seat mesh or grid section, as 6, and a curved back mesh or grid section, as 7, between which is an intermediatecurved grid portion 8, Figure 2. The wires in said sections are expanded or elongated in varying degrees and the meshes arexcorrespondingly distorted to form a curved shell which provides-body conforming contours, Figure 4.

A fastening or securing element, as a ring 9 of suitable rod or wire stock, as 2 gauge, is provided with means for accommodating fastening bolts, or the like by which the frame may be mounted on and securely attached to a suitable base. As shown in Figures 4 and 13, ring 9 has spaced flattened portions 10 which are provided with boltreceiving holes 11, said flattened portions being adapted to receive and support flat top end portions of legs or other base members, shown in dotted lines, Figure 13, conventionally provided with bolt holes which come opposite said holes 11 when the frame and the base'are assembled.

The shell construction above described provides a lightweight but sturdy chair frame, or the like, which is contoured to conform in general to body contours of persons in sitting or reclining positions thereon. Also, the rim, besides functioning as a strength imparting element, provides a peripheral lip which retains in position a certain type of upholstery pad provided with a marginal attaching band having a wire ring enclosed in an edge pocket thereof which, however, forms no part of the present invention. A further advantage of the above-described frame construction in use is that it may be employed advantageously with any one of various types of supporting bases.

A practical method of making a furniture frame or shell according to the present invention includes cutting wire strands or rods of 10 gauge steel wire stock to the required lengths and arranging a plurality of them as transverse members 20 in crossed relation to a plurality of longitudinal members 21, Figure 5. These are welded together at their intersections to form the fiat mesh or grid, as 22. Said grid is placed between suitable dies, preferably hydraulically actuated, one of which presents generally convex curved surfaces and the other, generally concave curved surfaces conforming thereto. The effect of applying dies pressure to said grid 22 while engaged between said dies is to draw and thus elongate portions of wires 20 in a transverse direction and portions of the wires 21 in a longitudinal direction, the extent of such elongation being greater at mid-portions and less at edge portions of said grid 22. Said elongation distorts the meshes of grid portion 22 and forms the curved contour intermediate grid portion 8, Figures 2 and 6, imparting thereto a permanently curved compound sectional confor.

Additional transverse wires 23, Figure 7, are applied crosswise and welded to said longitudinal wires 21 at their intersections to provide an initially fiat back portion grid 24; and additional transverse wires 25 are applied crosswise and welded to said cross wires 21 at their intersections to provide an initially flat seat portion grid 26. Said seat and back portion flat grids are placed between dies having appropriately curved shaping surfaces and are subjected to drawing pressure such that the flat grid meshes thereof are distorted in varying degrees as said seat and back portions are die pressed into curved sectional contours, which form said compound curved con tour seat grid 6 and said compound curved contour back grid 7, Figures 2 and 9.

The upper and lower perimeter or rim wire rings 3 and 4 are applied to and across outer end portions of the mesh or grid-forming

wires

20, 21, 23 and 25 and are welded thereto at their respective intersections, as 5, Figure 11; and free end portions, if any, of said wires which extend outwardly beyond said perimeter or rim wires are trimmed off to provide a finished frame edge.

The chair frame is completed by welding the securing or attaching ring 9 to under portions of the crossed wires forming the curved seat grid 6.

The above-described method permits mass production of said wire frames or shells at relatively low cost and insures uniformity in their style, construction and durability factors.

I claim:

1. Furniture frame comprising a plurality of longitudinal wires and a plurality of transverse wires having portions welded in crossed relation to form a body supporting mesh with portions of said mesh deformed to provide in effect a body supporting member of inherent curved contour, and an upper rim wire welded to upper surfaces and a lower rim wire welded to lower surfaces of end portions of said longitudinal and transverse wires.

2. Furniture frame according to claim 1 and including a fastening ring secured to a portion of the underside of said mesh. 7

3. Furniture frame comprising a plurality of spaced apart longitudinal wires, a plurality of spaced apart transverse wires in crossed contiguous relation thereto and welded to said longitudinal wires at their points of contact to form a body conforming and supporting mesh which provides a back portion inherently curved outwardly from its periphery and a seat portion inherently curved downwardly from its periphery, an upper rim member Welded to upper surfaces and a lower rim member spaced from said upper rim member and welded to lower surfaces of end portions of said longitudinal and transverse wires to provide a peripheral. rim which interconnects the outer ends of said wires.

4. Furniture frame according to claim 3 and including means secured to the under side of the seat portion of said mesh for attaching frame supporting legs thereto.

5. Furniture frame according to claim 3 and wherein a portion of the mesh between said back and said seat has openings of greater extent than those in said other portions of the mesh.

6. Furniture frame according to claim 3 and wherein said upper rim member and said lower rim member are endless wires arranged in substantially parallel spaced relation peripherally around said body supporting mesh.

References Cited in the file of this patent UNITED STATES PATENTS 400,292 Bolus Mar. 26, 1889 980,602 Clark Jan. 3, 1911 1,580,522 Murray Apr. 13, 1926 1,694,293 Trudo Dec. 4, 1928 2,000,788 Reed May 7, 1935 2,111,426 Hilbert Mar. 15, 1938 2,265,321 Smith Dec. 9, 1941