US780278A - Collapsible stretcher. - Google Patents

Description

' No. 780,278. PATENTED JAN. 17, 1905.

K. FRBULER.

COLLAPSIBLE STRETGHER.

APPLIOATION I'ILEI) JULY '2, 1904.

2 QHBBTB- SHEET 1- a, By I it arn No. 780,278. PATENTED JAN. 17, 1905. K. PIREULER.

GULLAPSIBLE STRETGHER.

APPLIOATION I'ILEID JULY 2,1004.

2 snnms-smmf a.

114m ewe 1520672302.

Patented January 1 7, 1905.

PATENT OFFICE.

KASIAR FREULER, ()F ZIIRICH, SVUTZERLAND.

EQLLAPSlBLE STRETCHER.

SPECIFICATION forming part of Letters Patent No. 780,278, dated January 1'7, 1905.

Application tiled July 2, 1904. Serial No. 215,187.

To this end my invention consists in forming the pivot-holes in the lazy-tongs levers constituting the said sides at such a distance from each other that when the stretcher is extended the said sides curve upward, and so displace the pivot-holes in the cross-stays, also formed in lazy-tongs fashion, that when the stretcher is extended the said cross -stays curve downward, the extremity of some of the said cross-stay lazy-tongs levers being adapted to abut against the edge of the adjacent lazy-tongs levers to limit the down-curving of the cross-stays, and thereby also the extent to which the stretcher can be extended, so as to permit the stretcher-cloth to bulge in when weighted without coming into contact with the cross-stays and insure the stretcher being securely stayed crosswise. I attain these objects by the mechanism illustrated in the accompanying two sheets of drawings, in Which-- Figure 1 is a diagram of a portion of the stretcher side extended. of the stretcher when extended; Fig. 3, an end view from the right of the stretcher extended. Fig. 4 is a side view of one of the cross-stays. Fig. 5 is a side view of the stretcher-head with partly-lowered handles. Fig. 6 is a partial plan, on an enlarged scale, of one of the corners at the head of the stretcher extended. Fig. 7 is a section on line A B of Fig. 2, also on an enlarged scale.

Similar letters refer to similar parts throughout the several views.

In carrying out my invention the stretcher- Fig. 2 is a side view frame sides and ends consist, as in my Letters Patent No. 7 40,002, of 1908, each of two lazy-tongs a 7), disposed pivotally upon each other. The pivot-holes :1: of each lazy-tongs lever, Fig. 1, are, however, not equidistant, the distance 3/ being a fraction greater than h, the distance 3' greater than 1 and K: greater than This causes the stretcher sides to curve upward, as shown in Figs. 1 and 2. The corner-pieces (Z are made of angle-iron and have riveted thereto plates 25, which at the head of the stretcher have square holes, in which the rails q are guided, Fig. 6. The extremiti es of the lazy-tongs a b at the stretcher head and foot are pivoted to the plates 6 and to slides g, the movement of the. latter and lazy-tongs thereon being, however, not limited by abutments in connection therewith, the extension of the lazy-tongs being limited by the cross-stays 6. The pivot-holes of the cross-stay lazy-tongs levers are so situated that when the stretcher is extended the crossstays curve downward, Fig. 4., one extremity of some of its lazy-tongs abutting against the edge of the adjacent ones. This limits the distance a, Fig. 3, of the end lazy-tongs levers of the cross-stay, which are pivoted to sockets on the lazy-tongs of the stretcher sides, so that the cross-stays only allow the stretcher sides to extend a certain distance, each crossstay limiting such extension. The cross-stays curving downward enables the cloth w, secured to the stretcher, when weighted to bulge in without touching the same.

The handles a are at one end pivoted to the respective head-plates and by means of rails 0, having slots, so linked to the slides g that when lowered they lie against the cornerpieces at, and their upward movement is limited by the rails 0.

hat I claim as my invention, and desire to secure by Letters Patent,is

In a collapsible stretcher with sides and ends formed in lazy-tongs fashion, the pivotholes in the lazy-tongs levers constituting the said sides formed at such adistance from each other, that when the stretcher is extended the said sides curve upward and cross-stays also formed in lazy-tongs fashion with pivot-holes so displaced that When the stretcher is ex- 1 In Witness whereof I have hereunte set my tended, the said cross-stays curve downward, hand 1n presence of two wltnesses. the extrelmty of some of the sald cross-stay lazy-tongs levers being adapted to abut v KASPAR FRLULER' 5 against the edge of the adjacent lazy-tongs Vitnesses:

levers, all combined substantially as and for CARL MULLER,

the purpose set forth. JOSEPH SIMON.

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