Improvement in tilting chairs
US 170561 A
Description (OCR text may contain errors)
PATENT; DFFIcn LEVI HEYwooD, 0F GARDNER, MASSACHUSETTS. i
IMPROVEMENT IN TIVL'I'INGI` CHAIRS.
Specification forming part of Letters Patent No. 170,56l, dated November 30, 1875 application filed January 7, 1875.
To all whom it may concern:
.Be it known that I, LEVI HnYwooD, of Gardner, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Tilting Chairs: and that the following is a full, clear, a-nd exact description of the Same, reference being had to the accompanying drawings, and
to the letters of reference marked thereon,
making a part ot' this specification.
Thisinvention is in the nature of an improvement in tilting chairs; and the invention consists in a tilting chair the swivel of which is constructed with an arm pivoted to the spider, and supporting a spring which is coniined between said arm and one ofthe arms of the spider, a stop being arranged s o as to come in contact with the head ot' the swivel, or in line with the axis oi' its rotation, and the front and back stops being substantially equidistant from the point of oscillation, all substantially as is hereinafter more fully described.
Itis desirable lin swivel and tilting chairs that the construction of the spider and the swivel should be Such as, with b'ntslight modication, will admit of the spring being placed either in front or in rear ot' the center of the seat, and also to place the stop below the center of the seat, so that the tilting oi' the seat may be effected without unnecessary jar or suddenness, which results when the stop is placed at the rear.
In the accompanying sheet of drawings, Figure l is a side elevation, showing spring in rear of swivel-screw; Fig. 2, plan of same, and Fig. 3 spring in front of swivel-screw.
Similar letters ofr reference indicate like parts in the several gures.
A represents the spider of a tilting chair, which may be constructed with three radial arms, a b c, or in other suitable form. To one of the arms of the spider, and at any suitable distance from the center of the same, are cast or otherwise formed two lugs, d c. Secured between these lugs by a pivotal bolt, f, is an arm, B. One end of this arm is cast with or otherwise secured to the upper end of the, swivel cling the projections g h. To the center of the spider A, and to its under side, is aflixed a stop, E, of rubber or other suitable material.
This stop-is so arranged that it will come in contact with the head of the swivel C. A
My tilting and swiveling device being constructed substantially as above described, its
operation is as follows: The spider A is secured to the bottom ot' the chair-seat frame 'by screws or otherwise, and the swivel C inserted into its proper bearing in the legsor other support of the chair, as in ordinary swivel-chairs, and when it is desired to tilt the chair-seat backward the weight of the occu'- pant is thrown back, when the spider will oscillate on the pivotal'bolt f, tilting the seat backward, the spring D acting as an elastic cushion to receive the weight as the Seat is tilted. When the seat recovers its horizontal position the stop E comes in contact with the head of the swivel, and enables the seat to maintain that position.
A very great advantage is derived from placing the stop in a central line, so as to come in contact with the swivel-head, and that is, that there is less leverage, and therefore less force, required when the seat recovers its horizontal position, and in consequence the chair is less liable to be strained and racked than is the case when the stops are f placed under the extreme front and rear of the seat-frame.
inclined too far backward.
This stop, it Will be observed, is formed by the spring D and the projections g and h within it. This Spring being placed but a short distance from the point of oscillation, the rear tilting of the seat is effected without jar.
'This construction of a swivel and tilting chair is equally applicable whether the spring The same remark will apply to the stop which checks the chair from being- Having thus described my invention, what l I claim as nemand desire to `secure b Lt'- ters Patent, M l
In a. revolving' tligchrfthtmbnw tion of thearm B,stop E, and swivel C with