US1526390A - Spring construction - Google Patents

Description

feb. 17. 1925./

F.4 R. STEVENSON SPRING CONSTRUCTION Patented Feb. 17, 1925` UNITED STATESY FREDERICK RICHMAN STEVENSON, OF MITCHAM, SUTH AUSTRALIA, AUSTRALIA.

SPRING CONSTRUCTION.

Application niet April 5, i922. serial No. 549,819..

To all 'wiz-cfm. t may concern: y

Be it known that FREDERICK RIGHMAN S'rnvrnrsoN, a subject of the King of Great Britain, residing at Princes Road, Mitcham, in the State of South Australia, Commonwealth of Australia, hath invented certain new and useful Improvements in and (lonnected with Spring Construction, of which the following is a specification.

My invention relates to improvements in and connected with spring cushions for vehicles and upholstery, the object of the same being to construct a spring cushion in such a manner as to afford very great resiliency without rendering it liable to work out of shape, this object being achieved by the application and use of various elements constituting a new constructional combination the parts of which are so arranged as to produce the desired etli'ect.

The invention herein described is intended to include the upholstery for the backs of railway carriages and the beds of sleeping cars, sofas, and analogous structures.

The cushion constructed in accordance with my invention may be built upon either a wire, iron, or wooden foundation., a corresponding shape of wire being used to control the shape oit its upper edge, a special feature of construction consisting of y an intermediate frame ot wire of smaller dimensions which is attached by suitable means to vertically ar anged outer rows ot coil springs which are connected both to the top and bottom frame.

These springs are held in position by suitable means and are tied to each other in adjacent groups by wire ties which are joined up so as to ai'ford great stability to the structure which is further strengthened by hinged diagonal stays crossing from the top frame to the intermediate frame. The loose ends ot intermediate groups of stays may also be joined together with wire attachments it necessary but in the majority of cases this will not be required, but in order that my invention maybe clearly understood I will further describe the same by aid of the accompanying illustrative drawings wherein Fig. l is a plan ol a cushion showing.

methods ot" attachment, the bottom attachments and cross frame wires being omitted in portion `of the illustration.

Fig. 2 is a longitudinal or side elevation ot the cushion.

Fig. 3 is an outlined end view of the structure showing cross stays and middle conA necting plates. 1 i

Fic'. 4; is an inverted view of portion of the structure showing bottom attachment plates.

Fig. 5 is an inverted view of a single spring showing bottom attachment plate on a larger scale.

Fig. 6 is an end view of cushion showing a foundation trame of wood.

Fig. 7 is an attachment device constructed of wire :for intermediate springs.

. Figures 8 and 9 are a plan view and side elevation, respectively, of an attachment device ttor half coil springs.

In each of the illustrations similar' letters of reference are used to denote similar or corresponding parts wherever they occur.

In the drawings o is the toundation'rame of steel, wire, wood, or other material upon which the longitudinal and lateral crosswires l) are stretched. To these cross-wires I attach the coil springs c by means of any convenient fastening device such tor instance as the fastening shown at l which consists of two strips of metal slotted at their ends for the clearance of the orosswires, the wings oit the slotted portions being bent round the outer coil of the spring as indicated in Fig. 5, the strips of metal which constitute the fastening device being centrally punched out as indicated, one strip having a clean hole punched through the metal whilst the other strip has triangular Vshaped or other' lapping pieces left in the openings which are subsequently bent over to bind the two strips together as will be readily understood on reference being made to Fig. 5 of the drawings. A

The fastening device above referred to is adaptable to double ended springs of the nature more particularly shown in Figs. 2 and 3 of the drawings, and also used in part of Fig. G, but it is desirable that in the outer row of springs in Fig. 6 a. spiral spring oit the type commercially known as halt-coil springs should be applied having its lower end of relatively small diameter as shown at c in that figure. in which case the fastening device may be of the nature shown in Figs. 8 and 9 and consists of a somewhat cone shaped split thimble adapted at its lower ends for the reception ot' crosswires, its upper ends being flanged outwardly to engage the small coil of the spring as indicated. These fasteners may have the extremity oi'' one if its sides or wings cut away as indicated in Fig. 8 et the drawings.

In the upper portion ot the cushion I provide a steel wire frame f which may be similar in size and shape to the wire frame (t, and to this upper frame the outer rows of springs are attached by a simple 'Form ot attachment such as g but the cross-wires are dispensed with in the uppei` inline eX- cept that parallel with theA outer edge of the upper frame I supply single traine Wire which is also engaged by the outer row of springs by means ot attachment plates. I find in actual practice that it advantageous to leave the intermed' to rows of springs loose or unattached si their top ends.

A very important feature ot my invention consists of the construction and the arrange ment of an intermediate trame 7J which is usually situated midway between the upoer and lower trame and is ot smaller size than the former as more clearly indicated in Figs. l and 6 of the drawings as well as in other iigures.

The coil sprinesfare fastened to each othe opposite to this Irame by means of a suitabl fastening device consisting preferably o a disc Z having holes m toi-med therei trom whence the attachment wires-,.1` rar ate and terminate with bent or hooi ends as clearly indicated in Fig. 3 ot drawings.

In some cases a simpler tasteningstructure can be used consisting of a wire ioop o Which may be pressed into the torni ot a cross as indicated in Fig. the ends being turned downwardly7 and inwardly so as to make a hook suitable tor gripping over the wires. Either this device or simple wire hooks can be used itt it. is desired to join the intermediate springs together, the wire attachments being either diagonally arranged as illustrated or they may be at right angles to the frame.

For the further purpose ofA strengthening my cushion I use diagonal stays p preferably consisting of wire similar to that which is used for constructing the traine. These wires extend across the cushion from the top trame bars to the bars ot the intermediate and may be repeated in the bottom ot or across the structure and ere. preferably capable oi rotation 'where joined to the traine to allow for the relative movement et the traine bars when the springs compressed.

Having now particularly described my said invention and in what manner the same is to be perfor-ined I declare that what I claim is In improvements in and connected with spring cushions for vehicles and uphoistei'),r wherein cross-wires are used tor siipl'iortingy springs7 in-fans for attaching fd sprin i' to the cross-wires consisting ol two strips of metal placed at right :ingles to ea lh other, one ot which said strips is punched with a square hole. the other being punched in such a manner as to torni lapping pieces which are passed through the holes ot the toi-mer and bent over to bind the two strips .Oethe the ends ot the strips being rer the clearance for the cross-wires and the wings of the siotted portions boing bent round the outer coil of the spring.

In testimony whereof he hath aiiired his signature in presence of two witnesses.

FiEsRlCK RICHWN STEVENSON. lfitnesses:

(ioni: I-Innnnnr COOKE, JOHN Micrrixnn Vennen.

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