US1007813A - Adjustable chair. - Google Patents

Description

A. STONE.

I ADJUSTABLE CHAIR.

APPLICATION FILED MAY 13, 1910.

1,007,8 1 3. Patented Nov. 7, 1911.

2 SHEETS-SHEET 1.

INVENTOR.

ATTORNEY.

A. STONE.

ADJUSTABLE CHAIR. APPLICATION FILED MAY 13, 1910.

1,007,813, Patented Nov. '7, 1911.

2 SHEETS-SHEET 2.

37 =-38 Q 35 l Q Mk9 A e v INVENTOR. JZ. Siazze,

ATTORNEY.

COLUMBiA PLANOuRfkPgl C0.,WASHINGTO\ u c ANDREW STONE, OF INDEPENDENCE, MISSOURI.

ADJUSTABLE CHAIR. I

Specification of Letters Patent.

Patented Nov. '7, 1911 Application filed May 13, 1910. Serial No. 561,259.

To all whom it may concern:

Be it known that I, ANDREW STONE, a citizen of the United States, residing at Independence, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Adjustable Chairs, of which the following is a specification.

My invention relates to improvements in adjustable chairs, and my object is to provide a simple chair of this character which may be adjusted to suit the convenience of the user or which may be folded in knockeddown form so that it will occupy but little space when not in use.

In order that the invention may be fully understood, reference will now be made to the accompanying drawings in which:

Figure 1 shows a side elevation of my inproved chair, one position thereof being shown in full lines and another position being shown in dotted lines. Fig. 2 is a broken vertical section on line IIII of Fig. 5. Fig. 3 is an enlarged detail of part of the adjusting mechanism of the chair. Fig. 4 is a broken inverted detail of part of the adjusting mechanism. Fig. 5 is a rear elevation of the chair. Fig. 6 is an enlarged section on line VI-VI of Fig. 5. Fig. 7 shows the chair in knocked-down condition.

1 designates the back of the chair; 2 designates the front supporting legs; 3 designates the rear supporting legs, and 4 designates a pair of arms pivotally-secured at their rear ends to back 1 by bolts 5 and pivotally-secured at their forward ends by bolts 6 to a pair of links 7, pivotally-secured at their lower ends by bolts 8 to the upper forward portions of the supporting legs 3. The supporting legs 2 and 3 cross each other as shown in Fig. 1 and are pivotally-connected at their intersecting points by bolts 9. Legs 2 are also pivotally secured at their upper ends to the lower portion of back 1 by bolts 10.

11 designates the seat which is pivotallysecured at its rear side by bolts 12 to the lower end of back 1 and is slidingly sup ported at its forward end upon the upper ends of legs 3.

When the chair is set up ready for use, as shown in Fig. 1, legs 2 and 3 are prevented from folding by a pair of braces 13, pivotally-secured at their upper ends to bolts 10 and provided at their lower ends with hooks 14, adapted to enter pockets 15 in a pair of retaining-members 16 secured to the lower portion of the supporting legs 3. Hooks 14 are normally held in the pockets 15 by a pair of levers 17, the outer down-turned ends of which enter notches 18 in the lower ends of the retaining member 16.

Levers 17 are pivotally-mounted upon a pair of bolts 19 secured to a cross-bar 20, uniting the lower portions of legs 3, and the adjacent ends of said levers have a pin-andslot connection 21 whereby they are caused to operate in unison when the in-turned end 22 of one of said levers is depressed by the foot of the operator or raised by a spring 23, bearing against the underside of end 22 and secured to the cross-bar 20. The outer free ends of levers 17 have pin-and-slot connections 24 with legs 3 to hold them in line with the notches 18, so that they will enter the same when said levers are restored to normal position by the spring 23.

25 designates a ratchet-bar to normally prevent seat 11 from slipping forward upon the upper ends of legs 3. Said ratchet-bar is p-ivotally-connected by a bolt 26 at its upper end to a lug 27 secured to the underside of seat 11, and the lower portion of said ratchet-bar is in normal engagement with a tooth 28, on a metallic strap 29 having an upturned slotted portion 30 to limit the pivotal movement of the ratchet-bar 25. The pivotal movement of the ratchet-bar 25 is controlled by mechanism consisting of a hand-lever 31 at one side of the seat 11, a crank-shaft 32, to which one end of the hand-lever 25 is fixed, a bell-crank lever 33 pivotally-connected by a pin 34 to the ratchet-bar, and a connecting-bar 35 pivotally-connected at its ends to the crank portion of shaft 32 and the bell-crank lever 33. Crank-shaft 32 is journaled in bearings 36 secured to the underside of the seat 11.

37 designates a coil-spring to reliably hold the ratchet-bar 25 in engagement with tooth 28, said spring being connected at its ends to the ratchet-bar 25 and the connecting-bar 35, as shown in Fig. 4.

38 designates a pair of stops secured to the rear portion of the seat 11 and adapted to engage the upper portions of legs 2 to limit the forward movement of said seat, as shown by dotted lines, Fig. 1, or limit the backward movement of the seat by engaging braces 13.

When the chair occupies the position shown by full lines, Fig. 1 and it is desired to adjust to the position shown by the dotted lines in said figure, this may be readily accomplished while sitting in the chair by pulling upward on the hand-lever 31. This operation of the hand-lever causes the toe of the bell-crank lever 38 to press downward on strap 29 and lift the ratchet-bar out of engagementwith tooth 28. Back 1 is then lowered by leaning against the same until the stops 38 engage the legs 2. As back 1 swings upon the bolts 10 it causes the seat 11 to slide forward upon legs 3 and thus maintain the equilibrium of the chair, so that the same will not tip backward when the occupant assumes a reclining position.

When it is desired to fold the chair, as shown in Fig. 6, for shipment or storage the in-turned end 22 is depressed to lift the free ends of levers 17 from notches 18, so that hooks 14 may be removed from pockets 15. Ratchet-bar 25 is then disengaged from tooth 28 when the chair may be readily folded.

Having thus described my invention, what I claim is:

An adjustable chair consisting of supporting legs, a back pivotally-connected to two of said legs, a seat pivotally-connected at its rear end to said back and slidinglysupported by two of the legs at its forward end, a ratchet-bar piVotally-connected to said seat, a tooth supported by two of the legs, normally engaged by said ratchet-bar, a bell-crank lever for disengaging the ratchet-bar from said tooth, a connectingbar for controlling said ratchet-bar, a crankshaft for actuating said connecting-bar, and a lever for controlling said crank-shaft.

In testimony whereof I aflix my signature, in the presence of two witnesses.

ANDREW STONE. Witnesses F. G. FIscHER, E. R. TI-IRELKELD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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