US1449401A - Adjustable back rest - Google Patents

Description

Mar. 27, 1923.

F. H. HEADLE Y ADJUSTABLE BACK REST Filed July 19, 1921 Patented Mar. 2 7, 1923.

[TED S ATES- FREDERICK HAGGER HEADLEY, OEBIRMINGHAM, ENGLAND.

. ADJUSTABLE BACK REST.

Application filed July 19,

T 0 all whom it may concern:

Be it known that I, FREDERICK HAGGER HnAoLnY, a subject of the Kingdon'i of Great Britain, residing at Kingscroft, 53 Woodlands Road, Northfield, Birmingham, in the county of \Varwick, England, have invented Improvements in or Relatin to Adjustable Back Rests, of which the fofiowing is a specification.

The present invention has relation to metallic chairs, stools, seats, or the like, and primarily comprehends an improved back rest for such articles which is readily adjustable to suit the user.

According to the present invention, the back rest comprises a bowed or U-shaped strip of metal adapted for ready and adjustable attachment to the seat bottom or adjacent part and said strip has provided upon its centre part a pivotally or hingedly connected back part or plate frictionally adjusted or mounted so as to conform with or automatically adjust itself to the users back when the bowed strip or back rest has been adjusted or fixed upon the said seat bottom or adjacent part. The bowed or U-shaped strip of metal may be adapted for attachment to side strips of the seat bottom by an adjustable stud and slot or perforation connection and two side supporting struts hingedly connected to the bowed strip may have their extremities also adapted for attachment to said side strips by a stud and perforation connection so as to retain the back at the desired angularity. The back plate or part adapted to contact the users back is conveniently pivotally mounted at each extremity to cranked parts of the bowed strip for the purpose aforementioned.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet of drawings, upon which Figure 1 is a perspective view of a metallic chair or the like having a back rest according to thisinvention, and

Figure 2 is a plan view illustrating the pivotally mounted back part or plate hereinafter referred to.

In a convenient embodiment of the present invention, the seat bottom 1 comprises an oblong blank of sheet metal which is suitably upholstered or covered upon its upper face.

, this oblong seat are provided with fore and The front and rear longitudinal edges of 1921. Serial No. 485,890.

rear bars or metallic strips 2 and 3 arranged with the major dimension of the section vertical, and these bars or strips have their extremities bent inwardly at right angles and are coupled together by metallic side strips 5 and (3 which are extended beyond the back edge of the seat as illustrated. A number of perforations or apertures 7 are provided in each of these side strips 5 and (3 between the fore and rear bars 2 and 3. The back support comprises a bowed strip of metal or strip of metal 8 bent to a U configuration and the extremities or end parts of the limbs of the U are adapted for attachment to the rearwardly extended parts of the side strips 5 and 6. To this end the side strips 5 and (3 have laterally projecting threaded shanks rigidly mounted therein or thereon by means of a nut, and these shanks are each adapted to be engaged with any one of a series of perforations 9 provided in the end parts of the limbs 8 of the back support, and wing nuts 10 are adapted to operate upon the shanks for locking the back suppcp't in the desired position. The shanks or studs project in opposite directions away from the seat bottom 1. In order to support this ,U-shaped back 8 metallic supporting struts 11 are employed, one on each side of the chair, and each of these side supporting struts involves a curved strip of metal which is pivotally attached flatwise against the arms of the back support 8 adjacent the upper part thereof and the lower extremities of said side supporting struts 11 carry screwed shanks or studs adapted to be engaged with any one of the series of perforations 7 in the side strips 5 and 6 of the seat bottom-from the inner face ofthe side strips, and thumb screws or like members .12

are provided upon said screwed shanks or studs for locking or securing purposes. By adjusting the back support 8 and the side supporting struts 11 the angularity of the back can be readily altered to suit the user.

The U-shaped or'bowed strip of metal 8 adapted to constitute the back support involves two substantially parallel limbs and a connecting part, and this connecting part has pivotally hinged thereto the back plate or back part 13 which is adapted to readily conform with the users back after theback rest has been adjusted as aforestated. The connecting part aforementioned of the bowed or U-shaped strip of metal 8 has two parts along its length cranked to virtually constitute a shallow elongated channel configuration, and in this channel configuration the back part or plate 13 is adapted to operate. The back part or plate 13 itself involves an oblong blank of sheet metal or like material which is suitably upholstered or covered and is carried by a strip of metal 15 which extends along the back of the plate or part and has its extremities bent at right angles to itself. These extremities, are fulcrumed within the extremities of the shallow channel configuration aforementioned by means of screw pins or like members 14 which pass through the two engaging parts, and the attachment of the parts is of a frictional character so that the pivotal back plate 13 will remain wherever it is automatically placed by the users back. It will be understood that the entire back rest and nected to the limbs and pivot'ally and adjustably connected to the seat, and a back swingably connected to the said limbs.

In witness whereof I have hereunto set my hand.

FREDERICK HAGGER HEADLEY.

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