US2593750A - Extensible seat for chairs - Google Patents

Description

April 22, 1952 GRElTZER 2,593,750

EXTENSIBLE SEAT FOR CHAIRS Filed May 20. 194? 2 SHEETSSHEET 1 I l l I 20 X6 wvs/vrox 7 /i/y/e 698157721676 A ril 22, 1952 M. GREITZER EXTENSIBLE SEAT FOR CHAIRS Filed May 20, 1947 2 SHEETS--SHEET 2 LE. :55: Q.

J5 E-JG Patented Apr. 22, 1952 UNITED S TATE S PATE NT O FFICE EXTENSI-BLE SEAT FOR CHAIRS- Meyer Greitzer, Los Angeles, Calif.

Application May'20, 1947, Serial No. 749,150

2 Claims.

My invention relates generally to chairs and. more particularly to the seats thereof, the principal object of my invention being to provide a simple, practical and efficient unitary structure carrying the chair seat and adapted to be mounted on the chair frame, and which structure folds or collapses vertically, so as to elevate the seat and thereby temporarily convert an ordinary chair into a high chair for childrens use.

Further objects of my invention are, to provide a chair seat elevating structure having simple and effective means for automatically and positively locking the folding structure when elevated, thus entirely eliminating the possibility of collapse of the structure while elevated and further, to provide a seat elevating structure 'of the character referred to that is simple, strong, durable, light in weight and which is capable of being easily and quickly applied to the chair frame and its seat.

With the foregoing and other objects in View, my invention consists in certain novel features of construction and arrangement of parts which will be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

Fig. 1 is a top plan view of the collapsible seat elevating structure.

Fig. 2 is a front elevational view of the structure applied to a chair frame and its seat with the latter in its normal or lowered position.

Fig. 3 is a front elevational view with the seat in elevated position.

Fig. 4 is a vertical section taken on the line 4-4 of Fig. 1 and showing the seat in elevated position.

Fig. 5 is a cross section taken on the line 5-5 of Fig. 3.

Fig. 6 is a detail section taken on the line Ii6 of Fig. 5.

Referring by numerals to the accompanying drawings which illustrate a preferred embodiment of my invention, I0l 0 designates the horizontal seat supporting rails of a tubular metal chair frame, which rails provide a support for my seat elevating structure, the latter including a substantially rectangular base frame II, preferably composed from a single piece of channel iron with its flanges outwardly presented.

Rails I0 fit snugly between the flanges of the side rails of frame II, with pins I2 projecting from the webs of the side rails through apertures formed in the inner portions of rails ID, as seen in Figs. 2, 3 and 4.

This means for securing the chair seat carry- 2 ing frame is set forth in U. S. Letters Patent No. 2,390,878, issued tome December 11, 1945.

A conventional chair seat S is secured on top of a pair of parallel rails I3, preferably angle bars, by screws I4.

Arranged between the end portions of rails l3 and the front and rear rails of frame II, are upper and lower hinge plates 15 and I6 respectively. The ends of the upper plates I6 are bent at right angles to form flanges ll, the upper ends of which are pivoted to pins or rivets I8 adjacent the ends of rails I3, and the lower ends of flanges IS on lower plate I6, are pivoted to pins or rivets 20 on the front and rear railsof base frame I I.

The lower ends of flanges I 5 and upper ends of flanges I'Q'are pivotally connected by means of pins 21 same being offset outwardly from the vertical planes occupied by pivots I8 and 20, thus forming hinge joints which prevent accidental collapse of the folding structure.

Located on the outer faces of plates I5 and I6 adjacent their ends are retractile springs 22, the upper ends of which are anchored to loops 23 struck from plates I 5 and the lower ends of these springs engage hooks 24, struck from plates .IB short distances from the joint between said plates I5 and from the hinge pins 2 I.

When the folding structure is open and elevated, springs 22 are under tension, thus yieldingly maintaining the plates I5 and I6 against folding movement and collapse, and when the hinged ends of said plates are pushed inwardly, said springs act to instantly fold or close the collapsible structure.

To secure the folding structure in open position and lock same against collapse, a plate 25 is connected by hinges to the front rail of face frame I0, and projecting from the hinged edge of said plate is a short handle 21.

When the structure is open with plates l5 and I6 vertically disposed, plate 25 occupies position between said plates I5 and I6, as seen in Fig. 5, thus effectively preventing the latter from folding inward.

The lower ends of retractile springs 28 are connected to frame I0 above hinges 25, and the upper ends of said springs are connected to plate 25 near its free edge. 7

A stop 29 on plate I5 near one end, limits the upward swinging movement of the locking plate 26. When collapsed, the folding structure is disposed within base frame ID, as seen in Figs. 1 and 2, and thus seat S is supported in its normal position just above side rails III of the chair frame.

To elevate the seat for children's use, said seat is lifted and when hinge plates 15 and I6 are vertically disposed with hinge pins 2| occupying vertical planes outwardly from that occupied by pivots l8 and 20 locking plate 25 will, under the influence of springs 28, be swung upward against stop 29 thus, in effect locking the folding structure against accidental collapse.

To lower the seat, plate 26, by means of handle 27 is swung downward to a horizontal position below frame l0, and the hinged edges of plates I and I 6 are now pressed inward or toward each other so that rails I3 and seat S carried thereby will, under tension strains of the springs 22, move to their normal lowered position. 1

An especially desirable feature of my invention is the structure including the hinge plates l5 and I6 and plate 25, which by a single movement or action, shifts the seat S into a self locked elevated position, and when the locking means is released, theseat by a single action, moves to its normal position on the base frame.

Thus it will be seen that I have provided a collapsible seat support for chairs, which is simple in structure, inexpensive of manufacture and very effective in performing the functions for which it is intended.

Minor changes in the size, form and construction of the various parts of my improved collapsible chair seat may be made and substituted for those herein shown and described without departing from the spirit of the invention,-the scope of which is set forth in the appended claims.

seat, of pairs of hinged plates connecting said frame and seat retractile springs disposed beof the hinge connection tween the members of each pair of hinged plates, a plate hinged to one side of said frame between said pairs of hinged plates and retractile springs associated with said hinged plate and frame for swinging said plate into position between said pairs of hinged plates when the latter are swung into vertical positions to elevate said seat.

2. The combination with a chair including side rails, of a frame mounted on said side rails,

a "chair seat, plates having theirv lower ends pivotally connected to the frame near its sides, hinge plates pivotally connected to said seat near its sides, the lower ends of said last mentionedhinge plates being hinged to the upper ends of the first mentioned hinge plates and retractible springs having their ends secured to said hinge platesand extending across the axis between said plates.

MEYER GREITZER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED sTATEs PATENTS

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