USRE11067E - griswold - Google Patents

Description

vi Sheetssheet 1 L. F GRISWOLD. Assignor to THE CHARLES PARKER COMPANY. EXTENSION FIXTURE FOR LAMPS, &c.

No. 11',06'Z. Reissued Mar. 18, 1890 WITNESSES:

WM W a w 2 Sheets-$heet 2.

L. I. GRISWOLD;

Assignor to THE CHARLES PARKER. COMPANY. EXTENSION FIXTURE FOR LAMPS,

820 No. 11,067. Reissued Mar. 18, 1890. .FL-g! Y N TOR I iwz V flttorney.

WLTNESSES:

I Bl dza flw ting thel'ower' we: the ower tube and the BEST AVAILABLE COPY LEXVIS F. GRISYVOLD, OF MERIDEN',

PATENT OFFICE.

CONNECTICUT, ASSIGJOR T O T HE CHARLES PARKER COMPANY, OF SAME PLACE.

EXTENSION-FIXTURE .FOR LAMPS, 80C.

SPECIFICATION forming part of Reissued Letters Patent No. 11,067, dated March 18, 1890.

Original No. 401,347, dated April 16, 1889. Application for reissue filed July 13, 1889. Serial No. 317,471.

for Lamps, Chandeliers, and other Articles;

and I do hereby declare the following to be a full, clear, and exact description of the inven:

tion, such as will enable others skilled in the art to which it appertains to make and use the same. 'Ehis-=invntion relates to extension-fixtures. fonlainpgzchandeliers,&c.,.which'use a spring; drum for suspending the -movable part of the fixture andi'tsitttachments', and frictional devicesfor resistingthe turning of the drum as the lightsare raised andi'lowered.

In the present-improvement, as shown, I make use of two such frictional devices-one? on each side of thedrum, which is movable endwise on the shaft to .b'earagainst one .or

of said devices the upward motion only andjthe other resisting the downward motion only; I also 'f'rovidesaid frictionaldevices with means 2 i'egulating their fric; tional acti'on,- and pmfidrthe suspendingt means foi adjustingitstensi'on, ill .eounterbal aljghe movable fixture andjt f attached enthe latter are mijvay between their Iowes'tjposit'ion, howweighttmay vary. Se faras I'am at is new rto employ, iii-combination. witha fixture having itshnovable'pmt balanced in -this middle position, two brakes, one retarding downward motion, the other upiward motion.

In. the-.acoornpanyingf-drawingspFigure 1 representsa-"vertic'ah sectionthrough anextngionefixture for a orchandelier, omit devioes=attaeh tbexdto. This section is" taken onthe axial lineof theidrum shaft, the parts being shown. in the positions occupied when the lights: are ,midway between their highest andlowest points'of suspension. I Fig. 2 represents a similar view, the parts being 5o shown in the-positions occupied when the the other as therlights ascend or descend, one.

vpasses. Except the special construction of and forced by springs N sion. Fig. 3 represents a detail view of the winding end of the shaft and the key which looks it. Fig. 4 represents a detail view of the two disks and their pawls in perspective. Fig. 5 represents a similar view of one of the disk-shaped springs bearing thereon.

A designates the suspension eye or loop; B, the frame attached thereto; 0, the shaft of the drum journaled in the sides of said frame and having a protruding prismaticor rectangular end a; I),t he spring-drum mounted on p W eca ble of endwise and rotatory-motionrth reo and screw-threaded at' one s'ide'to engageisciiew threads C on said shaft; '11," the coiled/"spring for counterbalancing the lamps and movable part of the -fixtu're, said spring-being, as usual, attached to said shaft atits innerend and to said drum at'its outer end; F, the suspension-cord wound on said drum; G, the upper tube screwed in to the-lower end of said frame; H, the lower tube sliding up and-down on said upper tube, and I the guidepulley over which the cord the shaft and drum; the above parts are old and well known.

.. J designates a vertically-sliding bar having a square recess at its-lower end and having'a hook formed, onfits upper end for a handle. It is held in a guide-loopy, formed on the outside of frame B, and occnpies a position above the protruding end a of said shaft. Thisbar forms-a key for locking and ,nnlocking saidshaft. When raised out of engagement therewith,- it allows said shaft to be turned .for winding said spring to the desired tension. The key J is then pressed down until ithears against three of; the flat faces. ofsaid'" rectangular end, and thereby holds said'shaftagainst all further rotation. Brake-disks K lj'are arranged on said shaft toward drum D, which is between "them, and against interposedwashers-n. Nuts'M, turning on screwthreads G- (3 of shaft 0, regulate the tension I of said springs andihold them in place. The screw-threads (3 do notiengage the drum, al-

though the screw-threads 0', as already stated, do engage-it Each brake-disk is provided peripheral ratchet-teeth, those of ai le- "fiiessessses xsaenlhresfi 5 Fig.

middl position,

of disk L by a pawl Tl; former pawland ratchet-teeth are arranged to hold disk K motionless when the lights descend, but allow it to turn freely when they ascend,

5 whereas pawl I and the ratchet-teeth with which it engages have the reverse action with respect to disk L.

The operation is as follows: The shaft C is turned by a wrench applied to end 0 until the 0 spring E is sufiiciently wound to counterbalance the movable part of the fixture and the lamps and attachments suspended thereby when the latter highest and lowest position. The drum and 5 proximate parts appear as in Fig. i when the lights are thus suspended midway. The lights and movable part of the fixture are then raised to the highest position by hand, the spring E simultaneously turning the a drum D, winding the suspension-cord thereon,

and, by the engagement of the screw-threads of said drum with the screw-threads C on said shaft 0, forcing said drum from left to right and compressing spring N, as shown in 2. The nut M, bearing against said spring, is thentightened, if necessary, until the disk K and spring N are able to hold the lamps {and movable. part of the fixture against descent; When the lights are pulled down. I the jdrtiin" travels along the shaft rem g1; tic-left, relievingthe pressure on '.,sphfn'g"N sothat' the increasing tension of the-springs for bythe lessening fi' iction 'of thc brake. On reaching the "1 and. thereafter the spring if! "supia'firts themovablepart of the fixislcK-no longer offering any apfistaitlce'; but the continued travel um tojt'ardtheside on which is I cfmn-fiisg es springN" more and more, :thiitwh 'en ygmpvor chandelier is reb drawingit down the a y vvl l, .:w:ill resist the upward of'sai hghts'sufiiciently to compenjiisdt'ensioh of the spring hat'tfle p ith of the main iention, therefore, lies in with: a spring-drum which s t he fixture to'be supported trinediate 6f its-high rmost and rev'enting th descent of the fixgiof the 'd-rnmfwillholdit, and for preare midway be een thelhp l-ightsdescend forces-back said "points of adanstmenc, of snitabieany. poinha-bovethatat w ni h the AVAlLABLE 6 venting the ascent of the fixture from any point below that at which the weight of the fixture counterbalances the force of the spring.

The axis or shaft C is provided with a longitudinal slot 0, which receives the inner end of the spring and allows said spring to moviendwise with drum D without separating.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a suspension device, the combination, with the spring-actuated drum and a spring which counterbalances the suspended article and lowermost points of adjustment, of suitable means otteringafrictional impediment or resistance against any downward movement of the suspended article when the latterma-y be adj usted above the point at which its weight is counterbalanced by the said spring, and also offering a frictional impediment against any ascent of the suspended article whenever the latter may be adjusted to a point below that at which its weight is counterbalanced by the said spring, all substantially as set forth.

:3. The combination of a shaft; a drum movable endwise the teen, a friction-brake on each side-of with which said drum is brough nto .conta ltrnately-by itsendwise move- "nren t sc fsai shaft; asu'sp'endihg-cord wound on Said'fd 'n'd'a spring actuating the latter; substantially;set fcrtli.

3. A- sfii-inghicttiated dram,- a: shaft with wliichsa'id dr'nm has screw thread connections, and-{a friction device on each side of said.drum;-the said frictional devices being arranged-- for contact alternately with said drdm SnfiG latter-moves in opposite directions isnbs'taintially as :Sehfbrth.

4;In'oombination-with a shaft having screw-threads, a: spring-actuated drum movably monntedonsaid shaft and liav-ing screwth reads'wliiehengage with the threadsthereof, a br'ake-disk-arrzinged on each side of said drum 'and h aving peripheral ratchet-teeth facing'in-opposite directions, 'pawls engaging with said teeth, and springs which force said "disks toward said drum, all substantially as 'and for the purposes set forth.-

In testimony whereof I affix mysignature,

witnesses. LEYVIS F. GRISX'VOLD.

at a locality intermed ate of its h ghermost this 21st dayof'Ju-ne, 1889,in presence of two

Images