US2718257A

US2718257A - Tilting chair

Info

Publication number: US2718257A
Application number: US395392A
Authority: US
Inventors: Lie Finn
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-12-01
Filing date: 1953-12-01
Publication date: 1955-09-20
Anticipated expiration: 1972-09-20

Description

Sept. 20, 1955 F. LIE

TILTING CHAIR Filed Dec. 1, 1953' United States Patent TILTING CHAIR Finn Lie, Ring St., near Hamar, Norway Application December 1, 1953, Serial No. 395,392

Claims. (Cl. 155-77) The present invention relates to tilting chairs where the seat is mounted for rearward tilting under resilient control.

One object of the invention is to provide a simple and durable tilting device which is easy to apply to seat members of different types and is cheap to produce.

Another object is to provide a tilting device comprising a torsion bar having a relatively great length and the ends of which are anchored to the seat member and a member supporting same, respectively, to twist said bar during tilting of said seat member, whereby a wide range of regulations are obtained.

An embodiment of the invention is as an example illustrated in the accompanying drawing in which:

Figure 1 is a perspective view of a portion of a chair embodying the invention,

Figure 2 is a top plan view of the seat-supporting structure, partially broken away, and

Figure 3 is a section along the line IIIIII in Figure 2.

The invention is shown and described as applied to an office chair where the seat member is swiveled and is also capable of tilting movement in a vertical plane, but as will be understood the invention is applicable to chairs of other types or to devices having seats capable of being tilted.

In the drawing 1 denotes a seat member and 2 a base of standard type in which is positioned a vertically adjustable pivot 3 on which member 1 is rotatably secured by novel means as will hereinafter appear.

An U-shaped member 4, formed of a bent metal band or strip, has its legs interconnected at the ends thereof by means of plate-shaped cross-pieces 5, 5' respectively secured at opposite sides of said member 4 as shown. Said cross-pieces have formed therein aligned bores for receiving an upper reduced end portion 3 of the pivot 3 whereby to mount said member 4 for rotatable movement around the axis of the pivot. Member 4 is positioned in a plane extending at right angles to the axis of said pivot and forms a support member for seat member 1.

The legs of support member 4 are provided with bores 6 in which is rotatably supported a tube-shaped member 7, the end portions of which are rotatably received in bearing sleeves 8 each secured to the adjacent side portion of the member 1 by means of a mounting 9. The inner ends of said sleeves are rigidly interconnected by means of a U-shaped member 10 having its plane parallel with the plane of the frame 1 and its bight portion positioned at the side of the axis of the tube-shaped member 7 opposite to the bight portion of member 4.

Within the tube-shaped member 7, and extending longitudinally thereof is a torsion bar 11, preferably a steel bar having square cross-section, one end of which is anchored to said tube-shaped member and the other end to the adjacent bearing sleeve 8. Said anchorages may consist of plugs 12 secured, as by welding, in said bearing sleeve and tube-shaped member, respectively, and being provided with square appertures for receiving the adjacent ends of said torsion bar 11. 1

2,718,257 Patented Sept. 20, 1955 On the bight portion of each of the

members

4 and 10 is secured, by welding, rive't'ting or the like, a U-shaped

member

13 and 14, respectively, having its legs extending inwardly of its bight portion. 2

In the legs of member 13 is rotatably supported a screw 15 with a handle 16 on its lower end. A nut 17 on said screw 15 engages the upper side of a fork-shaped free end 18' of a lever 18 secured on the tube-shaped member 7 serving to retain same against rotation in the clockwise direction, as viewed in Figure 3. The screw and

nut

15, 17 respectively, serve also as pre-tensioning means for the torsion rod 11, as a twist in a counterclockwise direction may be given to the same by pressing the free end of lever 18 downwards by means of said nut 17. Becauseof its pressing function nut 17 may be considered as a pressure member.

In order to prevent forward tilting of the seat member 1 from the normal position shown in the drawing the lower cross-piece 5' of the member 4 is provided with a rearwardly projecting extension 19 serving as an abutment for the lower leg element of the member 14. In the legs of said member 14 is rotatably secured a screw 20 having a handle 21 at the lower end thereof. The screw 20 is provided with a nut 22 serving as an adjustable stop which during tilting of the frame in clockwise direction against the action of the torsion rod engages the upper face of the extension 19 and limits said tilting movement.

I claim:

1. In a tilting chair the combination of a seat member, a base, a pivot extending from said base toward said frame, a support member mounted on said pivot, a tubeshaped member extending transversely of the seat member and rotatably secured in said support member, bearing sleeves secured at opposite side portions of said seat member and receiving rotatably the adjacent ends of said tube-shaped member, a torsion bar extending longitudinally within said tube-shaped member having one end anchored thereto and the opposite end to the adjacent bearing sleeve, adjustable means interconnecting said support member and tube-shaped member so that said torsion bar is twisted when the seat member is rearwardly tilted, and means interconnecting said bearing sleeves and co-operating with said support member to limit the tilting movement of the seat member in the opposite direction.

2. In a tilting chair as in claim 1, in which said adjustable means consist of a lever secured to the tube-shaped member and a pressure member carried by the support member and engaging the free end of said lever.

3. In a tilting chair as in claim 1, in which the interconnecting means includes a U-shaped member having an inwardly directed element which engages the lower face of a rearwardly directed extension on the support member and retains the seat member in normal position against the action of the torsion bar.

4. In a tilting chair as in claim 3 in which said U- shaped member is provided with an adjustable stop cooperating with the upper face of said rearwardly directed extension to limit the rearward tilting movement of said seat member.

5. In a tilting chair the combination of a seat member, a base, a support member, means mounting said support member on said base, a tube-shaped member extending transversely of the seat member and rotatably secured in said support member, bearing sleeves secured at opposite side portions of said seat member and receiving rotatably the adjacent ends of said tube-shaped member, a torsion bar extending longitudinally within said tubeshaped member having one end anchored thereto and the opposite end to the adjacent bearing sleeve, adjustable means interconnecting said support member and tubeshaped member so that said torsion bar is twisted when the seat member is rearwardly tilted, and means inter- 3 connecting said bearing sleeves and co-operating with 316,127 said support member to limit the tilting movement of the 2,095,947 seat member in the opposite direction. 2,403,425

References Cited in the file of this patent 5 UNITED STATES PATENTS 103,524

138,461 Winchester Apr. 29, 1873 l 4 Demand Apr. 21, 1885 Herold Oct. 12, 1937 Bolens July 2, 1946 FOREIGN PATENTS Great Britain Mar. 31, 1938