US2547897A

US2547897A - Adjustable back rest folding chair

Info

Publication number: US2547897A
Application number: US752321A
Authority: US
Inventors: Brunislaw F Wozniak
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-06-04
Filing date: 1947-06-04
Publication date: 1951-04-03
Anticipated expiration: 1968-04-03

Description

Apri 3, 1951 B. F. wozNlAK 21,547,897

ADJUSTABLE BACK RESTI'OLDING .CHAIR I Filed June 4, 1947 2 Sheets-Sheet 1 w/FM m April 3, 1951 B. |=.y wozNlAK 2,547,397

ADJUSTABLE BACK REST FOLDING CHAIR l Filed June 4, 1947 v 2 sneets-sneet 2 IN VEN TOR.

Patented Apr. 3, 1951 UNITED STATES PATENT `FFICE i j 2,547,897 l ADJUSTABLE BACK REST FOLDING CHAIR Brunislaw F. Wozniak, Lynn, Mass. Y Application June 4, 1947, Serial No. 752,321

This invention relates to folding chairs and has particular reference to articles of this class com monly known as lawn chairs.

The invention has for its objectto provide an improved folding chair of the type referred to which will be of simple, eiiicient 4and comparatively inexpensive construction. Another object of the invention is to provide improved means for maintaining the parts of the chair in their extended and useable relationship. A further object of the invention is to provide simple and in expensive means for adjusting or varying the angular relationship between the back of the chair and the seat of the latter.

To these ends I have provided an improved 1y claim. (ci. 155-161) chair of the class described which, in the pre- K ferred embodiment of the invention, may be constructed as set forth in the following description, the novel features of the invention being particularly pointed out and dened in the claimV at the close of the description.

In the accompanying drawings:

Figure 1 is a top plan View of a folding chair constructed in accordance with this invention, said chair being shown in its extended or useable condition.

Figure 2 is a side elevation of the chair shown in Fig. 1.

Figure 3 shows the chair of Figs. 1 and 2 in its folded or collapsed condition.

Figure 4 is a section on line 4-4 of Fig. 2.

The illustrated embodiment of the invention, when adjusted for use, comprises a pair of upstanding relatively parallel and spaced apart front legs I0, I0, made from wood and pivotally connected intermediate their opposite ends as at II (Fig. 2). to the front ends of a pair of rearwardly, inclined side-bars I2, I 2, of wood whose rear endportions provide rear legs to rest upon the ground.

The upper or higher portions of the side-bar I2, I2 constitute parts of a seat which also includes a plurality of transverse seat slats I3 fastened at their opposite ends by screws or other;

These wise in positions upon the side-bars I2, I2. seat slats I 3, together with .a transverse tie-rod AIII (Fig. 2) that is also fixed at its opposite ends to 2 at IB, I6 (Figs. 1 and 2) adjacent to their lower ends to the upper ends of'wooden brackets I1, I'I, fastened by screws orV otherwise in position upon the outside of the side-bars I2, I2.

The side-bars I5 of the back rest are fitted against Jghe inner sides or faces of the brackets I1 and therefore are disposed in the same vertical fore-and-aft plane with the side-bars I2 of the base structure with the lower extremities of the side-bars I5 in immediate proximity to arcuate surfaces I8 provided upon the side-bars I2 of said base structure, said arcuate surfaces I8 being concentric with the pivots I6. This construction is provided so that when the chair is in condition for use stresses imposed laterally upon the upper portion of the back restr will be opposed by the engagement of the lower ends of the side-bars I5 with said arcuate surfaces, and at the same time angular adjustment of the back rest is provided for.

Each side-bar I5 of the back rest is made at its lower end with an inwardly off-set extension I9 which, through engagement with a suitable stop carried by the base structure, limits the rearward swing of its side-bar I5 on its pivot I6. Under one condition of adjustment of the back rest the extensions I9 engage one or more of the transverse slats I3 of the base structure to limit the rearward angular adjustment of said back rest so that it is supported in the position shown by full lines in Fig. 2. Under another condition of adjustment of the chair these extensions of the side-bars of the back rest engage a pair of supplemental stop members 20, 20 (Fig. 4) that are adjustably mounted in position against the under side of one of the slats I3 of the seat. As shown in Figs. 1 and 4 each stop member 20 consists of an oblong block of wood adjustably fastened to its slat 'I3 by a pair .of screws 2l which occupy slots 22 (Fig. 1) formed longitudinally through said block. One of these two stop blocks is disposed adjacent to one of the extensions I9 and the other block is disposed adjacent to the other extension. The two blocks are shown in their retracted inoperative positions but it will be clear that when they are adjusted toward and against the inner sides of the side-bars I2 they will occupy positions in the paths of the extensions I 9 and serve to limit the rearward angular adjustment of the back rest so that it is supported by said blocks in the position indicated by dotted lines in Fig. 2.

The upper end of eachfront leg IU is pivotally connected at 23to one end of an arm 24 whose opposite end is pivotallyconnected by a bolt 25 directly to one of the side-bars I5 of the back rest. Thus while the chair is occupied the back rest acts through the arms 24 to maintain the front legs Il] in upstanding operative position, but when the chair is not occupied the parts thereof may be adjusted relatively on the pivots I6, 25, 23 and Il into the compact assemblage illustrated in Fig. 3 by swinging the back rest forwardly on the pivot I6.

What I claim is:

A folding chair of the rcharacter described comprising, when in useable condition, a pair of upstanding front legs; a pair of inclined rear legs pivotally connected adjacent to their forward ends to said front legs intermediate the opposite ends of the latter and provided with a seat-'for the occupant, each of said inclined rearlegs being provided between its front and rear ends with an upwardly extending outwardly olf-set bracket; fa back rest comprising a pair of side-bars pivotally connected 'adjacent to their lower ends to said brackets in positions where they are disposed in the same vertical planes with said rear legs with their lower extremitiesy in immediate proximity to arcuate surfaces .provided upon said 'rear legs which are concentric with said pivotal l'connections thereby to afford lateral support to the back rest,v said side-bars being made at their lower ends with inwardly olf-set extensions disposed between said rear legs that are engageable with the under side of said seat to limit the rearward pivotal movement of said back rest relatively to said rear legs, and arms pivotally connected adjacent to their rear ends to said sidebars and also pivotally connected adjacent t-o their forward ends to the upper end portions of sai'd front legs.

BRUNISLAW F. WOZNIAK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS