US 316127 A
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No. 316,127. P nted.Apr. 21,1885.
WITNESSES MQW@ 207/ v 5 ATTORNHYS.
ADAM DEMAND, OF SHEBOYGAN FALLS, WISOONSlN.
SPECIFICATION forming part of Letters Patent No. 316,127, dated April 21, 1885.
Application filed September 25, 1884.
T0 at whom it may concern:
Be it known that I, ADAM DEMAND, of Sheboygan Falls, in the county of Sheboygan and State of Wisconsin, have invented certain new and useful Improvements in Tilting-Chairs, of which the following is a full, clear, and exact description.
The object of my invention is to provide a tilting-chairso constructed that the tension of the seat-leveling springs may be regulated to a nicety to adapt the chair to comfortably be tilted back by heavier or lighter persons.
The invention consists in particular constructions and combinations of parts of the seat-supporting devices of the chair whereby the tension of the springs which resist the tilting back of the chair is regulated by a yoke-piece, which bears on the one end of the springs, the other ends of which bear against the seat-supporting frame, which frame is pivoted to a plate having abackwardly-extending arm, on which the yoke-piece is fulcrumed, all as hereinafter fully described and claimed.
Reference is to be had to the accompanying drawings, forming part of this specification,in which similar letters of reference indicate cor responding parts in all the figures.
Figure l is a side elevation of a chair, part- 1y broken away and with my improvement applied. Fig. 2 is a plan view of the improvement detached from the chair and partly broken away and in section, and Fig. 3 is an enlarged detail central sectional side elevation of the improvement.
The letter A indicates the base or stool portion of the chair in which the seat-supporting screw B is held in the usual manner, and O is the chair-seat, which is made fast to the ends 0 of the arms 01 of the frame D by screws or bolts passed through holes d of the arms into the seat. Downwardly-projecting lugs E E are cast with or fixed on the frame D, through which lugs passes the pin or bolt F, which 5 passes also through the upwardly-extending lugs G G of the base-plate H of the seat-support, to which plate H the upper end, I), of the screw B is fitted. (See Fig. 3.) The plate H has a backwardly-extending portion (No model.)
or arm, H, on the upper face of which is formed or fixed the fulcrum-piece or rib I.
The letter J indicates a yoke-piece, which has an upper crossbar, K, fitted to bear on the rib I, and a lower cross-bar, L, into which the screw M'is threaded, so as to bear by its end or: the under side of the arm H of plate H, and the yoke J also has forwardly-extending side arms, N N, on which rest the lower arms or ends 0 of the spiral springs O, which are placed on the bolt F, and bear by their upper arms or ends 0 against the rearward extension, d*, of the frame D. The springs O tend normally to throw the chair-seat G forward until a lug or rib, P, on the under side of the frame D comes in contact with the shoulders R, formed on thelugs Gof the plate H to hold the chair-seat from tilting forward farther than about to a level position, as in Fig. 1, and the lugs G are cutaway behind the rib P to allow the chair-seat to tilt backward by rocking on the bolt F.
It is evident that by turning the screw M inward and upward the arms N will be carried upward and will compress or increase the tension of the springs O,to adapt the chair for use by a heavy person, who naturally will tilt the chair backward too easily it" the springtens'ion is insufficient, and to adjust the chair for a lighter person the screw M will be turned outward or downward to decrease the tension of the springs and allow the chair to be tilted by the lesser weight on it, as will readily be understood.
By adjusting the screw M as above described the resistance offered by the springs 0 may be regulated to a nicety to suit persons of any weight.
The drawings show two springs O, which are preferred, as they equalize the lateral strains on the parts to better advantage than would a single spring, which, however, may be used, if desired.
I show the pivot-bolt F made in cast metal, with a solid head, f, forming a shoulder at one end, and with the wrought screw or bolt end f set in the other end, on which screw the nut f is run outside of a washer, f, to hold the bolt F to place; but the pivot-bolt may have any preferred construction suitable for its pur- I ot-bolt, the ends of the said springs bearing on poses, as above described the yoke and extension d, respectively, subr 5 Having thus described my invention, whatI stantially as set forth.
claim as new, and desire to secure by Letters 2. In a tilting-chair, the combination, with 5 Patent, is the frame D, the plate H,pivoted thereto, the
1. The combination, with the frame D, havsprings O, and the yoke J, of the stop and ing depending lugs E, and rearwardjextension shoulder P R, substantially as shown and de- 20 d of the plate H, formed with vertical lugsG scribed.
on its upper surface, and the rearward exten- 1o sion H, the pivot-boltF, passing through the ADAM DEMAND lugs E G, the rocking yoke J, through which the Witnesses:
extension H passes, an adj usting-screw for the EGBERT RICHARDSON,
same, and the torsional springs O on the piv- WALTER Bonn.