US1913751A - Chair - Google Patents

Description

' June13, 1933. L. E. GOENEN ETAL 1,913,751

CHAIR Filed Feb. 25, 1929 20.13% 606/76 mm James Garrow" Patented June 13, 1933 UNITED STATE (PATENT OFFICE LEOLE.GOE1\IE1\TAND mains r names s'r. se, ivirnnnsorA, hssielvonsfro THE 'FRITZ-GBOSS COMPANY, or $1. rnnn mmnnsora. A CORPORATION or MINNE- som a Our invention relates to chairs and has for its object to provide a chairhaving an adjustable back rest adapted to be simultaneous- .lyinoved in up and down direction and in back and forth direction with respect to the seat.

Another object of the invention resides in a providin said chair with aframe pivotally connecte to said seat and with a lever pivoted tosaid frame, said lever having a forwardly extending arm adapted to support the back 1 back and forth movement of the said frame rest. j a

A still further object of the invention resides in providing a brace and in pivoting said brace to saidseat and lever in a manner such that thesaid back rest moves simultaneously in an up and down direction upon \Other objects ofthe invention resides in the. details of construction thereof and in the novel combination and arrangement of parts hereinafterillustrated or described.

In the drawing:

Fig. 1 is a perspective view of a chair illustrating an embodiment of our invention and showing the back rest moved into its most forward and lowermost position.

Fig. 2 is a side elevational view of the chair shown in Fig. 1 illustrating the back rest moved into its most rearward and uppermost position.

Fig. 5 is afragmentarydetail view of the;

bell crank lever and associated structure used with our invention with the locking bolt thereofremoved. j Fig. 6 is a sectional vlewutakenon line 6+6 of Fig. 5 illustratingthelocking bolt in place.

f In the adjustment of chairs employingadjustable back rests in which the back rest is adjustable in a back and forth direction a and in an up anddown direction, it has been found that tofit thechair to the user, a corresponding predetermined back and forward cum,

Application med Fhrfif 1929. rs'erialno. 342,449.

adjustmentfis required with each up and down adjustment. The instant invention? simplifies the adjustment ofthe backlrests of chairsby combining the two adjustments so that upon properly adjusting the back rest for height, thesaine will be automatically moved into properposition with respect to the front edge of the seat to accommodate allusers requiring the particular adjustment forheightl j For the purpose ofillustrating the application of our inventiomwe have shown a chair A oflordinary construction, whichcomprises four legs 10, 11,12'and 13 attached to a suitable crown block ll and flaring outwardly therefrom. These legs may have attached to them ca'ster wheels 15which serve the usual purpose. In the crown block 14 is mounted a standard 16 which carries a seat indicated in'its entirety at 18. Y This seat comprises a seat supporting structure 17 to which the standard 16 is attached and which carries a cushion 19 of anysuitable type. The seat supporting. structure 17 may be of any desired construction which, in the form of the chair shown, includes two side members 20 to which the supports for the back rest properare attached. j j j j p In conjunctionwith the seat 18, we employ a backrest 21 which is adapted to be simultaneously moved in up and dOWIlsCllrection and inbackand forth direction with I respect to the seatproper and which is adapted to be oscillated to vary the angularity thereof. This backrest is mounted as follows: To the rearward ends of the'side members 21 ofthe seat support 17 are pivotally connected by means ofrivets 22, two spaced uprights 23 and 24 which, in the form shown in Fig. 1, are connected togetherlby means of a tie bar 25 to form a U-shaped frame structure indicated in its entirety at 26. In

1 addition tothe uprights 23 and 2A we eniploy twoibraces 27 which are pivoted to the side members 20 of the seat support 17 inter-t are connected to the back rest 21 in a manner to be presently described.

The back rest 21 has attached to the back 29 thereof two brackets 30 which have pivoted to them by means of rivets 31 the forwardly extending arms of two bell crank levers 32. Bolts 33 pass through the bell crank levers 32 and the upper ends 34 of the uprights 23 and 24 and serve to hold the said bell cranks in locked position with respect to the frame structure 26. The other arms 36 of the bell cranks 32 which extend in a more or less downward direction, are pivoted to the upper ends of the arms 27 by means of rivets The bolts 33 used for locking the bell cranks 32 with respect to the frame structure 26 are specially constructed to prevent the rotation of said bell cranks. This construction is shown in detail in Figs. 5 and 6. A portion 38 of the shank of each of these bolts adjacent the head 39 thereof is constructed with longitudinal serrations which are adapted to fit into serrated holes 39 cut in the bell crank 32 and in the upper portions 34 of the uprights 23 and 24. Nuts 40 screwed upon the shanks of bolts 33 serve to clampthe parts together. When the nuts 40 of the bolts 33 are sufficiently unloosened and the bolts I backed up through the holes 39 of the uprights 23 and '24, the serrated shanks thereof become disengaged from said holes which in such case engage the cylindrical part of the shank. When the bolts 33 are so disposed T the bell cranks 32 may be oscillated with respect to the frame structure 26. When the parts are in such position, the frame 26 may be grasped by .the cross-bar 25 and the entire back rest supporting structure moved forwardly or rearwardly as required. Due to the braces 27 which are connected to the bell cranks 32, forward movement of the frame 26 causes the forwardly extending arms 35 of said bell cranks to swing downwardly and tomove the back rest 21 in a corresponding downward direction. Rearward movement of the cross-bar 25 causes the back rest 21 to be correspondingly raised. When the proper position has been determined, the nuts40 of the bolts 33 may be tightened which causes the serrated shanks 38 to reenter the holes 39 in frame members 23 and 24 and deprive the said bell cranks of rotational movement, thereby securely locking the same in place.-

For the purpose of facilitating the adjustment of the device, the rivets 22, 28, 37 and 31 are ust sufliciently tightened to permit of the movement of the parts connected therewith without play. The rivets 31 are further tightened to such a degree that the back rest 21 may be moved with respect to the supporting structure therefor about said pivots in a restrained manner so as to retain any adjusted angular position in which the same is placed. If desired, spring washers may be inserted between the bracket 30 and the bell crank 32 to assist in retaining such angular adjustment.

Although we have shown the locking de vice applied to the pivot between the bell crank and frame structure, it can readily be comprehended that the same may be applied to the pivot between the bell crank and brace instead.

In the'form of the invention shown in Figs. 3 and 4, the bell crank illustrated in the other forms of the invention has been dispensed with and a straight lever employed in place thereof. The remaining structure is identically the same as in the other form of the invention and therivets 31 and 37 for attaching the bracket 30 and brace 27 to the raising and lowering device are positioned at the ends of the arms formed on said lever.

The bolt 33 passes through the center of the lever 50 and is constructed identically the same as illustrated in Fig. 6 so as to hold the said lever 50 in adjusted position. The device. shown in these figures is slightly simpler to construct and has slightly different movements than that shown in Figs. 1 and 2, though the range of movement is not quite as great as in the former.

The invention is highly advantageous in that the proper adjustment of the back rest can be accomplished by a single movement of the back rest supporting structure. By positioning the back rest properly for height, the corresponding adjustment for position with respect to the front edge of the chair is also automatically secured. The invention is extremely simple and effective and will not readily get out of order. The device is both attractive in appearance and highly serviceable. The chair is of suflicient strength and rigidity and gives the user freedom of movement with proper back support.

Changes in the specific form of our invention, as herein disclosed, may be made within the scope'of what is claimed without departing from the spirit of our invention.

Having described our invention, What we claim as new and desire to protect by Letters Patent is:

l. A chair comprising a seat, a frame pivoted to said seat and extending upwardly therefrom, a lever pivoted to said frame and having a forwardly extending portion, a back rest connected to said forwardly extending portion, and a brace connected to said seat and pivoted to said lever at another portion thereof.

2. A chair comprising a seat, a frame pivoted to said seat and extending upwardly therefrom, a lever pivoted to said frame, a brace pivoted to said seat and to one end of said lever, a back rest connected with the other end of said lever, and means for looking said lever against movement relative to said frame.

i said lever, a back rest connected with the other end of said lever, a bolt extending through said lever and frame for forming a pivot for said lever, and a nut on said bolt for bringing said bolt into clamping relation with respectto said lever and frame.

4. A chair comprising a seat, a frame pivoted to said seat and extending upwardly therefrom, a lever pivoted to said frame, said lever having a forwardly extending arm and a rearwardly extending arm, a back rest connected to said forwardly extending arm, and a brace pivoted to said rearwardly extending arm and to said seat.

5. A chair comprising a seat, a frame extending upwardly therefrom, means on the seat for guidingsaid frame for movement in a back and forth direction, a back rest at the upper portion of the frame, means on said frame for guiding said backrest for move- 25 ment longitudinally with respect to said frame, and means for simultaneously moving said frame and back rest.

6. A chair comprising a seat, a frame extending upwardly therefrom, means for pivot-ally connecting said frame to said seat, a back rest at the upper part of said frame, a

member connected to said back rest and extending rearwardly therefrom, means for pivoting said member to said frame, said means being disposed remotely from said back rest to guide the back rest for longitudinal movement with respect to the frame, and fmeans for simultaneously swinging said frame and member about their pivots.

7. A chair comprising a seat, a frame extending upwardly therefrom, means for pivotally connecting said frame to said seat, a

back rest at the upper part of said frame, a member connected to said back rest and extending rearwardly therefrom, means for pivoting said member to said frame, said means being disposed remotely from said back rest to guide the back rest for longitudinal 50 movement with respect to the frame, and a brace pivoted to said seat forwardly of said frame and further pivoted to said member connected to the back rest rearwardly of the frame for simultaneously swinging said frame forwardly and said back rest downwardly.

8. A chair comprising a seat, a frame extending upwardly therefrom, means for pivotally connecting said frame to said seat, a go back rest at the upper part of said frame, a

bell crank pivoted to said frame and having a portion extending forwardly therefrom, a

back rest pivoted to said portion of the bell crank and a brace pivoted to said seat and to ,5 the other portion of the bell crank for simul-

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