US231576A - Chair and stool - Google Patents

Description

Patented Aug. 24,1880.

E. "I it (MndeL) G K HEIST Chair and Stool.

UNITED STATES PATENT OFFICE.

GEORGE K. HEIST, OF WINCHESTER, VIRGINIA.

CHAlR AND STOOL.

SPECIFICATION forming part of Letters Patent No. 231,576, dated August 24, 1880. Application filed March 31, 1880. (Model) To all whom tt may concern:

Be it known that I, GEORGE K. Hnrsr, a citizen of the United States, residing at Winchester, in the county of Frederick and State of Virginia, have invented certain new and useful Improvements in Chairs and Stools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to that class of chairs the seats of which are provided with a screw adapted to turn in a threaded socket supported by a pedestal or base, whereby the seat may be not only turned around, but may be also raised and lowered to obtain different heights, a familiar illustration of which is found in the ordinary piano-stool. It has been found that seats thus supported after a little use begin to wabble, by reason of the screw and socket wearing away, and that the. screw, because of its having solely to support the-weight of the occupant of the chair or stool, is liable to break, especially when it is run far out of its socket. Hence the screw is usually made large,whereby the weight and cost of the chair is greatly increased. There is also 'an' appearance, as well as the fact, of insecurity and frailness in this construction.

The object of one part of my invention is to obviate this. In this connection I wish to remark that the seats of piano-stools have been heretofore provided with a frame composed of arms depending from, rigidly secured to, and revolving with the seat and moving over a sleeve on the pedestal; also, that the screw has been incased in a sleeve moving vertically, but not revolving therewith.

My invention consists in a chair-screw adapted to support and raise and lower the seat, combined with a skeleton-frame moving vertically with said screw a 'ndhaving non-rotating ends, and with a nut to secure said screw and frame in the chair-pedestal, the parts being constructed and arranged as hereinafter specified and claimed.

The invention also consists in a revolving vertically-adjustable chair provided with a non-rotating back, following the chair-seat in its vertical adjustment.

In connection with this part of myinvention I may remark that revolving vertically adjustable piano-stools have heretofore been provided with non-rotating backs fast to the pedestal, and hence incapable of following the vertical adjustment of the seat, so that the higher the seat is raised the shorter the back therefor becomes, until it is practically useless as a back, whereas in my construction the back is fast to and follows with the seat, and hence is always useful as a back, and is of uniform height with relation to the seat, whatever the elevation of the seat may be.

'In the drawings hereinbefore referred to, in the several figures of which like parts are similarly designated, Figure 1 is a side elevation of a piano-stool embodying the first part of my invention. Fig. 2 is a vertical cross-section thereof. Fig, 3 is a cross-section on line m 00 of Fig. 2, looking at the bottom of the seat. Fig. 4 is a cross-section on the same line, looking down'on the top of the pedestal. Fig. 5 is a cross'section on line y y of Fig. 2, looking down upon the bottom of the skeleton-frame. Fig. 6 is a sectional elevation of the skeletonframe and the screw therein. Fig. 7 is a side elevation of the seat with a back attached, and Fig. 8 is a bottom-plan view of the same.

For convenience, I have shown my invention applied to a piano-stool; but it is equally applicable to sewing-machine chairs, dentists ch airs, revolving and other similar chairs having vertically-adjustable seats, as will be readily understood.

The pedestal or base a may be of any desirable form, having a tubular portion to con- 0 tain the screw 1), its frame a, and out at. The lower end of the screw is rounded and shouldered at c, and is adapted to turn in a plate, f, forming the bottom of the skeleton-frame c, and is secured thereto by a nut and washer, g. 5 The upper end, 0, of this screw is similarly shouldered to turn in the upper end or head,

h, of the frame, and it terminates in a squared portion which is fixedly secured in a plate, 2', adapted to be attached to the bottom of the chair-seatj, so that by revolving said seat the screw is turned without turning the frame.

The head 71. may fit in a recess in the face of plate 2', and the two are held together by securing the squared end of the screw to said plate 2', so that said head It forms a bearing upon which the seat turns. The nut dis screwthreaded to receive screw 1), and serves to permit the adjustment vertically of said screw by rotation therein.

The heads or plates f h of the frame 0 are connected by three or more rods, 7:, extended through holes in the nut d and disposed about the screw b. These rods may be secured to plate It by nuts, or by screwing directly into said plate, as in Fig. 6, or by being riveted down or upsetting their ends, and they may be secured in the lower plate,f, by upsetting or riveting their ends.

As the seat is turned to raise or lower it the rotation of the screw within the ends of the frame 0 cariies said frame with it, so that the said screw takes its supporting medium with it, and said frame having bearings by means ofits platef upon the walls of the tubular post or pedestal, and in the nutd by means of its rods 7;, the screw is steadied in its move ment, prevented from wabbling, and greatly strengthened.

By this construction the size or diameter of the screw may be diminished, whereby a saving in the manufacture of the chair is efiected that will about equal the cost of the frame, so that a much stronger and better chair can be produced, at a very slight, if any, advance in cost, than by the construction heretofore practiced.

Upon the face of the upper head of the frame I arrange sockets I, which may be riveted thereto or cast therewith, and adapted to receive the ends m of the frame of a chairback, u, said ends being suitably secured in the sockets by screws or other fastenings. The frame of the back is so curved, as shown in Fig. "7, as to clear the seat and permit said seat to be freely revolved without coming into 5-contact with said back.

' It will be perceived that the back, being secured to the non-rotating frame, will not revolve with the seat, but at the same time it will follow said seat in its vertical adjustment, so as to provide a whole and complete chairback, in whatever elevation the seat; may be. The said back is so arranged as to be readily removed from the chair whenever desired, and thereby a very convenient, combined, or convertible sewing-chair and piano-stool is provided.

What I claim is- 1. In a revolving chair, a seat, j, and its attached plate t, a screw, b, fixed to said plate 'i, plates f h, to receive the ends of the screw, rods k, and a nut, d, through which the screw and rods pass, said rods connecting the plates f h, and forming therewith, by means of the nut, a non-rotatin g frame, in which the screw is rotatable, in combination with a tubular pedestal, a, in which the screw and frame are vertically adjustable, substantially as described.

2. In a chair, the combination of a seat supported upon a screw which is rotatable in a pedestal or other base, whereby said seat may be adjusted vertically, a non-rotatin g socketed plate loosely connected to said screw, and a chair-back fitted in such socketed plate, the said plate and back being carried up and down with said seat as it is vertically adjusted, but not rotating therewith, substantially as and for the purpose specified.

3. In a chair, the combination of a chairseat, a screw attached thereto, and a pedestal or base in which said screw works to permit the rotation and vertical adjustment of the seat with a back applied, substantially as described, to the chair, whereby said back is carried with the seat in its vertical adjustment without rotating therewith, as specified.

In testimony whereof I affix my signature in presence of two witnesses.

GEO. K. HEIST.

Witnesses:

J. R. MESMER, J NO. JACOBS.

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