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Publication numberUS2993733 A
Publication typeGrant
Publication dateJul 25, 1961
Filing dateJul 13, 1959
Priority dateJul 13, 1959
Publication numberUS 2993733 A, US 2993733A, US-A-2993733, US2993733 A, US2993733A
InventorsJackson P Pinkham
Original AssigneeJackson P Pinkham
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Molded chair construction
US 2993733 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 25, 1961 J. P. PINKHAM MOLDED CHAIR CONSTRUCTION Filed July 15, 1959 m w W m JACKSON P. PINKHAM By I I 6.

2,913,733 MOLDED CHAIR CONSTRUCTION Jackson P. Pinkham, Vancouver, British Columbia, Canada (42 Sanchey St, San Francisco, Calif.) Filed July 13, 1959, Ser. No. 826,716 9 Claims. (Cl. 217-445) This invention relates to a chair, and in particular to a molded chair fabricated from plastic or other suitable pliable material.

An object of the invention is to provide a comfortable and durable chair which is of pleasing appearance, rela tively inexpensive, and easily manufactured.

Another object of the invention is to provide a chair which utilizes the natural spring and resilience of the material from which it is fabricated, thereby obviating the need of any auxiliary cushioning or suspension means.

It is a further object of the invention to provide a chair the shape of which automatically adjusts itself to provide seating space proportionate to the shape and weight of the person sitting therein.

It is a still further object of the invention to provide a chair in which the body and leg portions may be formed as separate units which are easily assembled and dismantled to facilitate nesting for shipping or storage of the chairs.

The chair according to this invention is fabricated in its entirety by molding it from a plastic material or from any other suitable pliable material such as metal or wood. In the preferred construction, the chair is made from a suitable plastic material such as polyester, polyethylene or a phenol resin with or without a filler or fibrous strengthening material incorporated therein. The different components of the chair may be made from the same or different materials and a multi-tone efiect may be obtained by making the different components of different coloured materials. The manner in which the chair is molded forms no part of the present invention and any of the well-known techniques in the art may be employed.

The invention is illustrated in the accompanying drawings, in which,

FIGURE 1 is a front perspective view of the chair,

FIGURE 2 is a longitudinal sectional view through the chair, and

FIGURE 3 is a transverse sectional view through the chair on the line 33 of FIGURE 1.

Referring to the drawings, the body of the chair comprises a back portion 12 having a forwardly extending outer projection 14 and another generally forwardly extending central projection 16 which is adapted to be attached to a leg construction 18 arranged to stand upon the floor.

The back portion 12 may be of any suitable shape, but in the embodiment shown, is slightly curved to form a dished shell and is provided with an aperture 20 which increases the flexibility of the back enabling the chair to conform substantially with the shape of a person sitting therein.

The outer projection 14 may, as shown, be in the form of a continuous loop or alternatively it may comprise a pair of forwardly projecting tongues or side portions converging towards the front centre of the chair to form a loop member.

The central projection 16 of the back is formed with a downwardly facing recessed portion 22 adapted to receive snugly therein the upper junction section of the leg con struction 18. The leg construction 18 may be formed by molding the legs as individual units, in units of two or in a full unit of four. Preferably however, the legs are formed in units of two, 26 and 27 and 28 and 29 respectively and the upper junction sections 30" and 31 of the two units are shaped so that junction section 30 fits snugly Patented July 25, 1961 ice into junction section 31 or vice versa. Each leg is of open channel shape having a flared upper end and a gradually diminishing cross section tapering down to a relatively small pad 32. The shape of the legs is such that they form natural diminishing extensions of the converging lines from the back portion 12 and the projections 14 and 16- thereof. Under load, the legs being of downward facing open channel construction, respond with spring and increased strength as they tend to open out to assume a more edge-on position. Since the legs are preferably of all-plastic construction, no floor guards or tips are required since the foot pads 32 will not damage floors or rugs.

The leg construction 18 may be attached to the body of the chair 10 as by molding, by means of a suitable adhesive or as in the embodiment shown, the leg units may be locked to the downwardly projecting extension 16 of the back portion 12 by means of a bolt 34 which passes downwardly through the recessed portion 22 and the junction portions 30 and 31 of the two leg units 26 and 27 and 28 and 29 respectively and is secured in position by anut 36. The simple manner in which the leg and body units are locked together enables the chair to be quickly assembled or broken down into units which can easily be shipped with corresponding units of a number of chairs snugly inter-fitting, thereby materially reducing the shipping space required.

The seat. 38 may be formed integrally with the body of the chair 10 or may, as shown, be formed as a separate unit. The seat 38 is attached to the body portion at the juxta-position of the outer front centre of the outer projection 14 of the back portion 12 and the front centre of the seat. The seat is preferably formed on one side thereof with a tongue 40, projecting downwardly therefrom, this tongue being rigidly secured to the front centre of projection 14 by means of an adhesive or in any other suitable manner. The seat 38 is thus suspended from the outer projection 14 in cantilever fashion and extends rearwardly towards the back 12 of the chair within the outer projection 14 to form a leaf-like seat having its only connection with the rest of the chair by way of the forward extension 14. With this seat suspension arrangement, any stress set up incident upon loading the seat is distributed throughout the body 10 of the chair and the leg construction 18 to provide a chair which automatically adjusts itself at all times in accordance with the weight and shape of the person sitting therein and which requires no auxiliary mechanical cushioning or suspension means to take the stress imposed thereon. This cantilever-type seat suspension provides a seat having spring downwardly, backwar-dly and sideways enabling it to be at all times adjusted to the weight and shape of the sitter. The downward movement of the seat is limited by its engagement with the upper surface of recess 22 or, if the bolt 34 is not countersunk, with the head of the bolt.

it will be noted that with the chair construction according to this invention, a more generous seating space is offered in exact ratio to the weight and shape of a person sitting therein. The downward prying action of the seat 38 on the outer projection 14 of the back 12 tends to pry the outer projection 14 to a more open condition, consequently opening the back of the chair of which the outer projection 14 forms an integral part. This prying action also tends to set all the planes of the various parts of the chair to a more edge-on position with consequent increase in strength. The design of the chair thus fully utilizes the natural spring nad resiliency inherent in the material from which it is fabricated.

What I claim as my invention is:

1. A chair construction comprising a molded integral body having a vertically extending back portion, a loop member extending forwardly from the back portion and a central portion connected to the loop member for connecting the same to a relatively rigid leg construction adapted to stand upon the floor, and a seat securely attached to and supported solely by the forward portion of said loop member, said seat extending rearwardly towards the back.

2. A chair construction as claimed in claim 1 wherein said leg construction comprises two units, each unit consisting of a pair of integrally formed legs, the upper portions of the two units snugly interfitting and adapted to be received into a downwardly facing recess formed in said central portion.

3. A chair construction as claimed in claim 2 wherein the legs are of downward facing open channel construction adapted to open out under load to assume a more edge-on position.

4. A chair construction comprising a molded integral body having a vertically extending back portion, a loop member integrally formed with said back portion and projecting forwardly therefrom and a central portion connected to the loop member for connecting the same to a relatively rigid leg construction adapted to stand upon the floor, and a seat securely attached at the juxtaposition of the front centre of said loop and one edge of said seat, the seat extending rearwardly towards the back portion and being suspended cantilever fashion by means of its connection to said loop member.

5. A chair construction as claimed in claim 4 wherein .said central portion is provided with a downwardly facing recess shaped to receive the upper end of said leg construction snugly therein.

6. In an article of furniture, a molded shell-like body having a vertically extending back portion, a loop portion extending forwardly from said back portion and a generally forwardly projecting central portion connected to the loop portion, a seat secured to said loop portion adjacent the juxtaposition of the outer front centre of said loop and the front centre of the seat, said seat extending rearwardly from said loop towards said back portion, and a leg construction secured to said central portion.

7. An article of furniture as claimed in claim 6 wherein said leg construction comprises two units each consisting of a pair of integrally formed channel shaped legs, the upper ends of said units snugly interfitting and shaped to be received into a recess formed in said central portion.

8. An article of furniture as claimed in claim 7 wherein said seat is substantially planar and is attached at one side to the centre section of said forwardly projecting loop portion by means of a tongue integrally connected to said one side.

9. An article of furniture as claimed in claim 7 wherein the leg construction is secured to the body by means of a bolt passing downwardly through said downwardly facing recess and the upper portions of the two snugly interfitted leg units.

References Cited in the file of this patent UNITED STATES PATENTS 2,588,417 Schladerrnundt et al. Mar. 11, 1952 2,703,135 Leatherman Mar. 1, 1955 2,815,801 Fingerhut et a1 Dec. 10, 1957 FOREIGN PATENTS 476,320 Great Britain Dec. 6, 1937

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2588417 *Oct 19, 1948Mar 11, 1952Valley Upholstery CorpFurniture construction featuring leg structures and mounting means therefor
US2703135 *Jun 5, 1952Mar 1, 1955Earl W LeathermanKnockdown nesting chair
US2815801 *Mar 14, 1955Dec 10, 1957Zenith Plastics CompanyLeg clamp for chairs and the like
GB476320A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3126229 *Feb 20, 1962Mar 24, 1964 Furnituke upholstering
US3230013 *Oct 14, 1964Jan 18, 1966Andrew I MorrisonMolded furniture
US3285660 *Apr 12, 1965Nov 15, 1966Beckman RonaldSeating
US3335990 *Sep 22, 1965Aug 15, 1967Thonet Ind IncFurniture supporting means
US3436446 *Jun 8, 1966Apr 1, 1969Union Carbide CorpMolding of foamed thermoplastic articles
US3604749 *Aug 5, 1970Sep 14, 1971Apl CorpChair
US4418958 *Jan 21, 1981Dec 6, 1983Watkin Bernard CPlastics chair shell
US5015038 *Sep 10, 1990May 14, 1991The Shaw-Walker CompanyErgonomic seat and back structure for a chair
US5411316 *Oct 13, 1993May 2, 1995Westinghouse Electric CorporationSingle piece chair shell
US5810438 *Feb 14, 1997Sep 22, 1998Herman Miller, Inc.One piece molded seating structure
US6428105Nov 14, 2000Aug 6, 2002Ford Global Technologies, Inc.Mesh vehicle seats
Classifications
U.S. Classification297/451.11, 297/DIG.200, D06/374, 297/452.14, 297/440.1
International ClassificationA47C3/12
Cooperative ClassificationY10S297/02, A47C3/12
European ClassificationA47C3/12