|Publication number||US299846 A|
|Publication date||Jun 3, 1884|
|Filing date||Sep 3, 1883|
|Publication number||US 299846 A, US 299846A, US-A-299846, US299846 A, US299846A|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (6), Classifications (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
TILTING' 01mm. No. 299,846. Patented June 3, 1884.
I (No Model.)
i r'rnn STATES Arnkr O FICE.
HENRY PARRY, OF MILWAUKEE, WVISCONSIN, ASSIGNOR TO THE MILWVAU- V KEEOHAIR COMPANY, OF SAME PLACE. I
SPECIFICATION forming part of Letters Patent No. 299,846, dated June 3, 1884.
Application filed September 3, 1883.
1'0 whom it may concern:
Be it known that I, HENRY PARRY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Tilting-Chairs; 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, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.
My invention relates to improvements in tilting-chairs, and pertains to that class in which the seat oscillates upon pivotal points, and its backward j movement is resistedby a tension-spring.
My invention consists and arrangement of the device by which the lever purchase of the seat upon the tensionspring may be increased and diminished, whereby a spring of a given tension is adapted to a light or heavy person.
My invention is further explained by reference to the accompanying drawings, in which Figure 1 represents a side view of a chair provided therewith, and Fig. 2 represents a vertical section thereof disconnected from a chair.
Like parts are represented by the same ref erence-letters in both views.
A is the chair-seat. O is the supportingbracket, which is provided with four radial arms, D D D D, arranged at uniform distances apart, and rigidly attached to the seat at their respective ends by bolts or screws at E. F is the stool. G is the supporting-screw. To the top of the supporting-screw G is rigidly attached a bracket, H. I is the tension-spring. J a are pivotal supporting-arms. K is the tension-adjusting lever. L is the adjustingscrew.
The bracket H is provided with downward- I projecting lugs M, to which the wivotal arms "a/ J are attached by pivotal bolt M, upon which bolt the seat is supported and oscillates. It is obvious that by thus attaching the lower ends of the pivotal arms to the downward-projecting lugs M, beneath theupper surface of in the construction (No model.)
the bracket H, the shoulders O 0, formed on the respective sides of said pivotal arms above said pivotal bolt N, are adapted to serve as stops to the seat in its backward and forward movement, against which the seat is brought to rest at the extremity of such movement.
The lever K is provided with hook P, which engages in recess Q of the bracket H, the bearings of said recess Q serving as a pivotal point upon which the lever K turns when adjusting the tension-spring, as mentioned. The front end of the lever K is connected by said adjusting-screw L to the screw-lug R.
The screw L is provided with a hand-nut S. As the hand-nut S is turned upward upon said screw, the front end of said lever K is drawn downward, whereby its rear end is thrown upward together with the front -end of tensionspring, which is attached thereto, thereby decreasing the lever purchase of the seat upon the spring, which has the effect to increase the resistance of the spring. By an inverse movement of the nut S the front end of the spring is brought nearer to the fulcrum or pivotal point of the seat, which has the effect to diminish the resistance of the spring, whereby a spring of a given tension is adapted to support a light or heavy person.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-
1. In a tilting-chair, the supporting-Mack et H, provided with downwardprojecting lugs M, formed below the plane of its upper surface, and stops 0 0, formed on line withits upper surface, in combination with the bracket 0, provided with radial arms D, pivotal arms J, and pivotal bolt N, whereby the said stops 0 are interposed between the pivotal bolt and the swinging end of said bracket, and adapted to support the seat at the extremity of its backward and forward movement, substantially as set forth.
2. The combination of bracket H, provided with pivotal bearing Q, lever K, centrally pivoted on said bearing Q, screw G, swinging arms J, bracket 0, and arms D, formed in a single piece, and attached to said bracket H by pivotal bolt N, pivotal bolt N, and spring I, connected at one end with the rearward-projecting arm D, and atits other end with said lever K,all substantially as and for the purpose specified.
3. Thecombination of four-arm bracket 0,
provided with pivotal arms J, bracket H,
5 provided with lugs M and stops 0, adjustinglever K, adjusting-screw L, and spring I, said spring being arranged beneath the rear supporting-arm of said bracket 0, whereby the seat is shielded from contact therewith, the
10 adjusting-screw of said lever K being located in front of the supporting-screw, whereby the tension of the spring is conveniently adjusted, all substantially as and for the purpose specified.
In testimony whereof I affix my signature in I 5 presence of two witnesses.
, HENRY PARRY. Witnesses:
J AS. B. ERWIN, PETER T. GRAVES.
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