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`Daktronics, Inc.
`STAGE EXHIBIT 1012
`EXHIBIT 1012
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`UNITED STATES PA-TENT OFFICE.
`
`LEONARD ATWOOD, OF FARIIUNGTON, 1\'I:AINE.
`
`1,1.10,248.
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`DRIVING MECHANISM FOR ELEVA TORS AND THE LIKE.
`Patented Sept. ·s, 1914.
`Application filed AprilS, 1913. Serial No. 758,578,
`
`Specification of Letters Patent.
`
`sents a hoisting .. drum and b the rope or
`Toallwlwrnitmayconr:ern:
`Be it known that I. LEoNARD ATWOOD, a cable passing once fully around the drum
`citizen of the United StRtes nf America, a!1d nnd over the tcp half portion .of the same·.
`a resident of Farmington, connty of Frank- Suspended from one. end of the rope is the 60
`5 lin, and State of Mnine, have invented cer- ~onnterweight c while the car dis suspended
`tain new and useful Improvements in Driv-
`fi'om the other rope end. This diagram(cid:173)
`ing Mechanism for Elevators and the like, matical figure is purposed to simply illus(cid:173)
`on the hoisting drum.' The rope or cable b •5
`of ·which the following is a specification.
`trate the ar:rangement o:f the ropes or cables
`This invention has reference to improve-
`10 ments in driving mechanism for elevators, j· thus produces more than three times the
`lifts, hoisting apparatus nnd the like which
`friction than is produced i~ the rope passes
`are operated by means of ropes or cabl('s only over the top half portiOn of the drum.
`that pass over a. hoisti?-g drum.
`.
`.
`F:or render!n~ this rop.e arra~geme~t pos-
`The present mventlon has for 1ts special sible the h01stmwdrum·1s prcvided with one 70
`15 purpose to avoid that a heavy car and conn-
`continuous helical thread hnving a continn(cid:173)
`terweight is required to ptoduce the neces.-
`oqs groove e as shown in Fig. 2.
`sary friction for effecting the work. . This
`The driving :m,echanisri1 illustrated in Fig.
`in time consumes an unnecessary quantity of 2 .comprises a substantial frame work f.
`power to operate the :elevator lift :or hoisting Upon the part of the frame shown to the 7 5
`left' -there is mounted reducing mechanisrn
`20 apparatus. Certain machines, require 600
`L~,c1<?~ed i:p. the reducing case g. In connec(cid:173)
`pounds of dead load to produce snffl:.ci~I_J.t
`friction to ~ift 100 pounds of live load wh1~h . tlon with th,e. ·reducing mechanism is the
`makes the car very heavy and the count~r- . nwtpJj i?haft h for applying power. A bep.r-
`weight accordingly so.
`ing··i is mounted· on the frame part shown to 80
`25 By winding the cables over . the hoisting
`the right in Fig. 2. The reducing mecha-
`drum one full turn and one half turn, in nism is provided with the driving shaft 1
`conjunction with the detailed construction
`for the drum extendillg ovei· to the bearing
`i. The shaft 1 has a longitudinal groove l
`hereinafter described, increased friction of
`the cables on the drum is produced which which serves for splining the shaft to the 85
`30 permits of using a relatively light car and drum. A threaded feed shaft k surrounds
`the right portion of the shaft j and extends
`counterweight.
`Idlers and secondary pul-
`into the bearing i where it is permanently
`leys for the cables are avoided and the car
`stops automatically at the desired point, secured by means of a screw Z. The drum a
`is provided with two hubs m, n. The hub 90
`which is not the case when the cables are
`35 tending to slip on the drum. The invention m has a lateral slot Jro} through which passes
`further consists in the construction of the a feather o. Thus the driving shaft j is
`drum and its arrangement on the motor splined to the hub rn. and the drum moves
`shaft which is splined to one. hub while a with it. The hub n at the other side of the
`stationary feed shaft with outer thread sur-
`drum is interiorly threaded and engages the 95
`40 rounds part of the motor shaft and engages
`thread of the feed shaft k whereby, during
`the inner threaded portion of a second hub
`the rotation of the driving shaft} the drum
`of the drum whereby the drum is adapted to
`travels along the feed shaft kin both a for(cid:173)
`move to and fro in a forward and backward ward or backward direction in accordance
`direction, all as will be fully described here- with the direction of the rotation of the 100
`45 inafter with reference to the accompanying shaft j. In Fig. 2 of the drawing the drum
`drawing in which:
`a is shown to have traveled on the feed shaft
`Figure 1 represents diagrammatically an k and the driving shaft } to near the end
`of the shaft slot p. When the rotation of
`elevator embodying the rope or cable ar-
`the shaft p is reversed the drum travels to- 105
`rangement for obtaining high friction. Fig.
`50 2 illustrates the drive mechanism for an ele~ ward the right because the feed shaft k is
`vator in side elevation, and Fig. 3 is a lon-
`permanently secured in the bearing i.
`gitudinal section on line 3-3 of Fig. 2.
`As previously mentioned
`the hoisting
`Similar characters of reference denote· · drum· (~ has one continuous thread with one
`continuous helical groove e. The plurality 110
`like parts in all the figures.
`In Fig. 1 of the Clrawing an elevator is 'of cables p, p\ etc., therefore always retain
`diagrammatically shown in which a repre-
`their initial position because the drum per-
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`1,110,248
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`forms a horizontal motion both in a forward
`and backward direction, leaving the ropes
`always in the same position relative to the
`top center portion of :the car. It is evident
`5 that the threads of the hoisting drum and
`its feed shaft must. correspond. Accord·
`ingly an idle wheel foi· guiding the ropes is
`not necessary and completely dispensed with
`by virtue of the increased friction produced
`10 by the novel arrangement .of the ropes or
`the ·hoisting drum whereby a
`cables on
`lighter car and counterweight ·may be used
`avoiding thus a large amount of dead weight
`and· saving power.
`.'
`'
`I claim as niy _invention:
`1. Driving mechanism for elev-ators, lifts·
`and.hoisting apparaths, :comprising a hoist-.
`ing drum with threaded hub and helical
`rope groove, ropes in said groove nround
`~o the drum, a driving shaft splined • to the
`drum, and a permanently fixed; exteriorally
`threaded feed shaft, loosely on the .. driving
`shaft and engaging the .threaded hub of the
`drum.
`\
`·
`· .. · :• · .
`:l. Driving mechanism for elevators, lifts,
`and hoisting. apparatus, comprising a driv(cid:173)
`ing shaft with longitudinal spline groove in
`its inner portion, a permanently fixed, ex(cid:173)
`teriorally threaded feed shaft loosely· on the ·
`
`driving shaft, a hoisting drum threaded on ::10
`the feed shaft. a:o.d hu,ving a helical rope
`groove,, ropes ' in said groove around the
`dru}n, a huh on the· .~:U.lll with slot and a
`feather
`therein
`traveling in the spline
`. . .
`. . 35
`groove ... ·;.
`3. Driving mechanism for the hoisthig ·
`drum of elevatol.;s, and lifts, comprising a
`drum, a driving shaft splined to the drum,
`a hub on the drum with feather tdveling ·
`in. the spline groove; a second· hub ori the 4<l
`drum with· interior. thread, and a perma(cid:173)
`nently fixed fe~d. shaft with an exterior
`thread in operative engagei'nent with: the
`inner'thread of said second hub. "
`4. In driving mechanism for elevators and -1;,
`lifts, a hoisting drum with helical groove,
`ropes in the said groove wound around the
`. rlrum for avoiding the raising o£ dead
`weigl)t, a driving shaft splined to th~ drum,
`a st.ationary feed shaft loosely :on· the inner· t t:
`end portion of· the ·driving shaft, and an::
`interrorly threaded hub on the drum en(cid:173)
`gaging the thread of thee feed shaft."
`Signed at Bosto:ii, Mass., March 26th 1913.
`.
`. · · · LEONARD ATWOOD.
`Witnesses:
`BEN • ST.r:NcL.ElriELD,
`N. M. ATWOOD.::
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`15
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`~5
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