US2009918A - Adjustable chair - Google Patents

Description

Patented July 30, 1935 PATENT oFFlcE ADJUSTABLE CHAIR Marcel Henri Grassi, Clamart, France Application November 7, 1934, Serial No. 751,900 In France November 22, 1933 9 Claims. (CL 155-38) The present invention has for its primary object to provide an adjustable chair utilizable particularly by children, the construction of this chair being such as to permit selective adjustment of its component parts so as to suit the increasing size of a child as he grows, so that the chair can kbe yused without structural modications for a period of about ten years or more or in different places where the child must sit down at different levels above the ground.

A further object of the invention is to provide an adjustable chair whose component parts may be folded up or collapsed into a small volume when in inoperative position or may be alternatively held with the required stability when in operative position.

Still a further object of the invention is to provide an adjustable chair wherein the seat has locking means which preclude any undue collapse of the latter when 'in operative position while being instantaneously disengageable for permitting the chair to be folded up into its collapsed position of rest.

A still further object of the invention is to provide an adjustable chair wherein the seat is so hingedly connected to pivoted members jointedly connected to the chair uprights that when said uprights and members are brought together or extended the seat can follow the folding or extending motions thus imparted to them so as to assume various adjusted positions in height responsive to the relative positions occupied by said uprights and members.

Still another object of the invention is to provide a new or improved adjustable chair made up of a minimum number of light and simple parts and capable of being manufactured and assembled at a minimum cost as regards raw materials and labor.

With these and such other objects in view as will incidentally appear hereafter, the invention comprises the novel construction, combination and arrangement of parts that will now be described with reference to the accompanying diagrammatic drawing forming a part of the present disclosure and showing by way of example a suit-v able embodiment of the invention.

As illustrated in the drawing, each pair of cross bars or battens X pivotally connected to each other at A is pivotally connected to the spaced uprights M1, M2 at its lower ends by pins B and C. The upper ends of the cross bars X are pivotally connected to the uprights by pins F, K slidably guided in slots or mortises D, E formed in the uprights respectively.

'I'he seat S which may be of any suitable construction (for instance of wickerwork or upholstered structure) is hingedly connected at its fore end to the pins or axes F by means of which the fore upper ends of the cross bars X are pivoted to 5 the fore uprights M. Teeth, notches, recesses or 1 a rack G are provided on thebackportion of the seat S, advantageously on its lower face as shown. Any one of the notches or hollows of the toothed portion or rack` G may be selectively brought into registration and into removable engagement with the pins K, should the latter project inwardly of the uprights to a suillcient extent, or with a cross rod bridging and connecting the back upperends of the cross bars X. AsA such a connecting cross rod corresponds in position with the pins K, it is not designated by a separate reference letter in the drawing.

Thus by engaging the pins or the crossrod K into the one or the other ofthe notches or recesses G formed in the seat S, after having closed or opened the cross bars X after the fashion of scissors, the height of the seat S with respect to the bottom ends of the uprights M1, M2 may be adjusted very easily to suit the size 25 of the child, whereafter the selected position of adjustment maybe preserved. In other words, the seat S and cross bars X form an articulated unit pivotally connected to the uprights forming the frame of the chair and adjustable height 30 wise by moving said uprights towards or away from one another after having unlocked the seat S from the pins K or from the aforesaid cross rod 1K.

The foot rest N is a separate fitting which, in 36 the embodiment illustrated, has parallel cranked arms O provided with pins P which may be se lectively engaged into notches or recesses H formed in the fore uprights M2. These notches o1' recesses may be perpendicular or oblique to the 40 longitudinal geometrical axes of said uprights, and they may be constituted, if found more c'onvenient, by the hollow spaces between the teeth of racks fixed to the uprights in any suitable way. The foot rest N may be adjusted at will to suit the length of the childs legs, due regard being p aid to the'height at which the seat S has been adjusted. l

, The arm rests Q are connected by pivots L t0 the tops of the fore uprights Mf'of the chair. 50 Slots I formed in the arm rests Q permit a slidable motion oi the pivots U which connect them to the back uprights M1 of the chair. This arrangement permits the arm rests to be folded 11p-along the general plane into which the chair 55 y is collapsed when brought into inoperative position. Clamping knobs J of any hiown'or ap proved construction are provided for locking the pivots U and thus for holding the arm rests Q in their operative position (as shown) or in their inoperative position. lSaidclamping knobs J may be roughened or knurled to facilitate the grip on them of the user.

'I'he uprights M1, M1 are provided, in-the embodiment illustrated, withlgdownwardly extending legs or supports V1, V2 which are pivoted to said uprights by means of the pins B, C. The legs V1, V2 are fitted with rollers R1, R1. Casters or like members can also be used instead oi these rollers to permit the chair to be more easily pushed here and there and driven along the ground even by the child himself eventually, when the legs V1, V2 are in their raisedv positions.

Means are provided for locking the legs V1, 'V'1 in their raised positions (as shown in full lines) or in theirlowered positions (as shown in dotted lines). In the present embodiment, said means consist, on the one hand, in cleats W1, W1' secured to the uprights adjacent their lower ends and, on the other hand, in notches Y1, Y1 i'ormed in the legs V1, W adjacent their pivotal connections. When the. legs are brought into their lower lpositions, their notches Y1, Y2 snap over the free edges of the cleats W1, W1 which hold the legs ilrmly until said cleats are disengaged from the notches Y1, Y2. l

AThe legs V1, Va may have any convenient shape and may ldiverge downwardly as illustrated for ensuring the required stability of the chair when in lowered positions.

. A small table such as T may be fitted to the chair and held as represented xedly or removably by'any approved or known device, for instance by pivots or by a slot and pin connection. Such a connection is not shown as it forms no part of vthe invention.

The adjustable chair as above described may be made mostly of wood, metal or any other suitable material.. It can be used either in residential or in commercial premises, for instance in hairdressers salons for permitting the hair of a child to be more easily cut since his seated body can be raised above the floor to the most suitable height for the hair dressing operation. Other ilelds ot utilization of this adjustable chair are obvious.

The constructional details of the chair might 55' vary of course without departing from the spirit of the invention.

1. An adjustable chair comprising two pairs oi spaced uprights, two pairs of pivoted cross bars pivotally connected at their upper and lower ends to said respective uprights, means on the uprights allowing sliding motion or the pivots connecting the uprights to the upper ends of the cross bars,-

a seat hingedly carriedl by the fore upper ends of the cross bars. abutment means on the back` upper ends of the cross bars. and locking means on the seat engageable with said abutment means, the seat and cross bars forming an articulated unit pivoted to the uprights and adjustable heightwise by moving the latter towards or away from one another.

2. An adjustable chair comprising two pairs of spaced uprights, two pairs oi' pivoted cross bars pivotally connected at their 4upper and lower ends to said respective uprights. slots in the uprights for allowing motion of the pivots at the upper ends heightwise by moving the latter towards or away from one another.

3. An adjustable chair comprising two pairs oi' spaced uprights, two pairs of pivoted cross bars pivotally connected at their upper and lower ends to said respective uprights, means on the uprights allowing motion of the pivots vat the upper ends of the cross bars along the uprights, a seat yhingedly carried by the fore upper ends of the cross bars, a cross rod bridging the back upper ends or the cross bars, and arow of notches on the seat engageable selectively with said cross rod, the seat and cross bars forming an articulated unit pivoted to the uprights' and adjustable heightwlse by moving the latter towards or away from oneanother.

4. An adjustable chair comprising two pairs of spaced uprights, two pairs of pivoted cross bars pivotally connected at their upper and lower ends to said respective uprights, slots in the uprights for allowing a sliding motion of the pivots at the upper ends f the cross bars along the uprights, a seat hingedly carried by the fore upper ends of the cross bars, a cross rod bridging the back upper ends of the cross bars, and a row of indentations on the lower face of the seat, said indentations being engageable selectively with said cross rod, the seat and cross bars forming an articulated unit pivoted to the uprights and adjustable heightwise by moving the latter towards or away from one another. j

5. An adjustable chair comprising vtwo pairs of spaced uprights, two pairs oi pivoted cross bars hinged at their upper and lower ends to said respective uprights, means on the uprights allowing al sliding'motion oi' the pivots at the upper ends oi' the cross bars along the uprights, notches in the fore uprights, a foot rest having projections engageable with said notches, a seat hingedly carried by the fore upper ends of the cross bars, abutment means on the back upperv 'pivoted to the uprights and adjustable heightwise bymoving the latter towards or away from l one another when the abutment means and locking means are disengaged from one another.

' .6. An adjustable chair comprising two pairs o! spaced uprights, two pairs of pivoted cross bars hinged at their upper and lower ends to said respective uprights, means on the uprights allowing a sliding motion of the pivots at the upper ends of the cross bars along the uprights, slotted arm rests spanning the uprights and hinged thereto, one of the hinges of each arm rest being slidable through its slot, a seat hingedly carried by the tore upper ends of the cross bars, abutment means on the back upper ends oi' the cross bars, and locking means on the seat engageable with spaced uprights, two pairs oi pivoted cross bars 7 hinged at their upper and lower ends to said respective uprights, slots in the uprights for allowing a sliding motion of the pivots at the upper ends of the cross bars along the uprights, slotted arm rests spanning the uprights and pivoted thereto, one of the pivots of each arm rest being slidable through its slot, a clamping knob for said last--4 named pivot, a seat hingedly carried by the fore upper ends of the cross bars, a cross rod bridging the back upper ends of the cross bars, and a row of indentations on the lower face of the seat, said indentations being vengageable selectively with said cross rod, the seat and cross bars forming an` articulated unit pivoted to the uprights and adjustable heightwise responsive to a motion of the uprights towards or away from one another after disengagement of the indentations from the cross rod.

8. An adjustable chair comprising two pairs of spaced uprights, two pairs of pivoted cross bars pivotally connected at their upper and lower ends to said uprights, slots in the uprights allowing motion of the pivots at the upper ends of the cross bars along the uprights, supporting legs tted at the lower ends of the uprights, a seat hingedly carried by the fore upper ends of the cross bars, abutment means on the back upper ends of the cross bars, and locking means on the seat engageable with said abutment means, the seat and cross bars forming an articulated unit pivoted to the uprights and adjustable heightwise responsive to a' motion of the uprights towards or away from one another after disengagement of the abutment means from the locking means. l

9. An adjustable chair comprising two pairs of spaced uprights, two pairs of pivoted cross bars hinged at their upper and lower ends to said uprights, slots in the uprights allowing motion of the pivots located at the upper ends of the cross bars along the uprights, supporting legs fitted with rollers and pivotally connected to the lower ends of the uprights, means for holding said legs in raised and lowered positions respectively, a seat hingedly carried by the fore upper ends of the cross bars, an abutment cross rod spanning the back upper ends of the cross bars, and a row of indentations on the lower face of the seat, said indentations being engageable selectively with said cross rod, the seat and cross bars forming an articulated unit pivoted to the uprights and ad` justable heightwise responsive to a motion of the uprights towards or away from-one another after disengagement of the cross `rod from the selected indentation. i

MARCEL HENRI GRASSI.

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