US12792A - Spring-roller for curtains - Google Patents

Description

` `.To all whomat mag/concern i A l. Be it known that we, JOHN HARTsHotRN.

dUmmm),sTALrEs 4PATEN'i OFFICE e JOHN HARISHORN AND JACOB HARTSHORN, `OF BOSTON, MASSACHUSETTS.

sPRING-ROLLER Fos cUR'rArNs.

speeincaioa ofLettersPatent-No. 12,792, dated May 1, 1855.

@fand JAooBI-IARTsHoRu, both of Boston, in i the county of Suffollrfand `State of Massa- `following is a full, cleaijand` exact descrip` tion, referencefbeing had` tothe annexed drawings, in which- ,.gchusetts, have invented anew and useful Improvement in Curtain-Fixtures, of which the Figure l isa frontjview of a'curtain with u our improvementsattached." Fig. 2 a section onthe linegAA ofFigJl." Figaview of `the rodl which carries the spring that sustains the curtain.` Figz will be referred to hereafter. l i,

`Window curtains have been suspended and balanced byspiralsprings contained l l within the curtain"rod,; therange of such springs "hashowever been `limited by the fact that theendfsof thesprings` were attached the one t thestationary the otherlto 4 therevolving partfof the` curtain rod, ,i in

such a manner as `always to!l remainWat a 1 `fixed and `iunvaryingi"dist-ance from` each o other; another consequence of this"metho d of securing lthe spring `is that it is apt to `buckle andftwist out of shape, as seen in Fig. 3,11bywwhichtheispring is soon deA strOyed." To remedy these inconveniences `and toVproduce` a spring of great range for the length ot` wire and coil employed is the4 object ofour present invention, which consists in securingone end l ofthe spring to a :stationary rod which sustains it, the other jbeingniade fastztofa block, whichat the "same time that itis caused to `revolve with the cylinder, is permitted to slide longitu- Idinally `to allowthei` spring to lengthen or shorten fasitis more orlessV wound up.

`To enable` others skilled in the art tounlderstand our invention` we will proceed to describe the mannerinwhich wehave carried` it out. f

l `In the accompanying drawings, B is the curtainwhich is attachedto the tncylinder C by the wire @secured to its upper end.

This cylinder.v has a longitudinal slot a along its whole length of suficient size only to ad- 1 `mit, the curtain. Immediately beneath this "slot is an enlargedchannel or trough b, into which the Vwirejib isslipped, the curtain being permitted to lproject through the slot a as seen 1n Fig. 2. This slot not being suffi- "ciently large to admit the passage of the wire, the curtain is held secured to its cylinder;4 D D are, plugs secured'to each end of the cylinder. i

E is a ratchet wheel secured to the plug D" having apawl F, by'means of which the revolution of the cylinder is regulated.

""G is a stationary rod which iits tightly into the bracket-s H, H and upon which the cylinder C revolves, the plugs D, D revolving freely upon the rod.

K K are blocks which fit looselyupon the rod G, and are allowed to slide longitudinally thereon. d are grooves in the circumference of these blocks into which entersthe projecting trough Z9, and thus these` blocks are caused torevolve with the cyl inder.

.M, M', are rightand left handspiral springs,- theinterior ends of which are secured to the blocks K, K the exterior ends L being fastened to rod G. When the springs are allowed to run down the blocks K, K',

approach the ends of the rod and the springs expand without interruption whereby a greater range of expansion is attained.

When the springs are wound up the length of the coil increases, to accommodate which the blocks K, K approach each other and thus the buckling or twisting of the `coil (seen at the right hand in Fig. 3) is avoided; this twisting soon destroys the operation of the spring, and will invariably take place whenever its normal condition is changed eitherby winding it upr or expanding it, if no pro-vision be made for a change of its effective length.

`What we claim as our invention and desire to secure by Letters Patent is- Attaching one end of the springs to the slidingblock K, K for the purpose of enablingwthem to increase and diminish in length iastthey are Wound up or expanded, in the manner and for the purpose set forth.

JOHN HARTSHORN. JACOB HARTSHORN. Witnesses e SAM. COOPER, JOHN S. Crow.

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