US112041A - Improvement in folding-chairs - Google Patents

Description

matted tatee @wat @mitra FRANCIS MARCH HOLMES, OF'BOSTON, MASSACHUSETTS.

Letters Patent No. 112,041, dated February 21, 1871.

IMPROVEMENT IN FOLDING-CHAIRS.

The Schedule'referred to in these Letters Patent and, making part of the same.

To all persons to whom these presents may come Be it known that'I, FRANoIs MARCH HOLMES, of

aston, ofthe county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Folding-Chair; and do hereby declare the same to .be fully described in ,thc following specification and represented in theaccompanying drawing, of .which- 4 Figure l isa vertical section of one of my improved chairs in an unfolded state, ready for use;

Figure 2 is a vertical section; and

Figure 3, a rear elevation of it as folded.

The main features of the folding-chair, as improved bv me, consist of a seat, A, two sets of crossed le- ;rs B B C C', a back, D, and two seat-supporting rungsE F. i

The longer levers, B B', are crossed on the smaller ones,O C', and pivoted thereto, the pivoted rod being shown at a. It goes through both sets of levers.

Furthermore, the longer levers are disposed between and against, or in close contiguity with the iorter levers.

The shorter levers are connected by the front-supporting rung E of the seat, and also by another rung s, the latter being disposed below the pivotal rod, such rungs, E s, being tenoned and firmly fastened in the levers so as to be immovable relatively thereto.

The longer levers are connected in a similar maner by two rungs 1' t, arranged as represented, and- -also by the back D, disposed between such levers in manner, as shown.

AThe rearmost seat-supporting rung, F, has pivots or journals at its ends toV rest in bearings in or'applied to the longer levers; and furthermore, it has two short plates or arms, G G, extended from it, and pivoted or hinged at their front ends to the seat, the two seat-supporting rnn'gs having their axles at unequal distancesr from the axis of the pivotal bar a, and the seat being provided withvan inclined bottom or cam, shown at VI, or the equivalent thereof, such as, while the chairinay be in the act of being unfolded, will raise the seat on the front rung into a horizontal position, or to the extent of thediii'erence in altitudes of the axes of the two seat-supporting rungs, or thereabont.

On the chair being folded, its parts take positions `relatively to each other, as shown in iig. 2, the seat A being in an upright position in front of the rungV E, and supported by the hinge plates or arms G, resting in inclined positions on the said rung E.

When the seat is horizontal or in the position to` receive a sitter, one or more hooks or stops H, extended down from it, bear against the i'ont rung, and thus aid in supporting the parts of the chair in their proper'positions for the chair to be used by a sitter.

Figure 4 is a top view of the rotary seat-supporting rung F, with its journals and its arms G Gr, and the hinge plates u u, each of such armsy infact composing one leaf of a hinge, which leaf is to be long enough to project beyond the rung somewhat greater .than the thickness or diameter ot' the front 4rung E,

all being as represented, andjto enable the seat to take a vertical, or about a vertical position when the chair is folded and resting on itsfour feet.

\Vhat, therefore, I claim as my present improvement in the folding-chair, provided with the seat A, the two sets of crossed levers B B G G', and two seatsupporting rungs E F, as described, consists in- 'lhe rnngs E F, as arranged with their axes at unequal distances froiu that-of the pivotal bar a, and the seat, as provided with the elevating cam I, or its equivaient, and hinged or connected with the back rung F, as explained, andsuch rung pivoted to the levers B B', all being substantially as hereinbefore described and as represented.

` F. MJ HOLMES.

7Witnesses R. H. EDDY, J. It. SNOW.

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